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coral / mtk-gst-plugins-base-debian / 94fb72fd6f1484a8148b0ec76abd07347b32eb19 / . / gst / typefind / gsttypefindfunctions.c
blob: eb8d2d20ad13b5000216582201e37564e430ec40 [file] [log] [blame]
/* GStreamer
* Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
* Copyright (C) 2005-2009 Tim-Philipp Müller <tim centricular net>
* Copyright (C) 2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* gsttypefindfunctions.c: collection of various typefind functions
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <glib.h>
#include <glib/gprintf.h>
/* don't want to add gio xdgmime typefinder if gio was disabled via configure */
#ifdef HAVE_GIO
#include <gio/gio.h>
#define USE_GIO
#endif
#include <gst/gst.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <gst/pbutils/pbutils.h>
#include <gst/base/gstbytereader.h>
GST_DEBUG_CATEGORY_STATIC (type_find_debug);
#define GST_CAT_DEFAULT type_find_debug
/* DataScanCtx: helper for typefind functions that scan through data
* step-by-step, to avoid doing a peek at each and every offset */
#define DATA_SCAN_CTX_CHUNK_SIZE 4096
typedef struct
{
guint64 offset;
const guint8 *data;
gint size;
} DataScanCtx;
static inline void
data_scan_ctx_advance (GstTypeFind * tf, DataScanCtx * c, guint bytes_to_skip)
{
c->offset += bytes_to_skip;
if (G_LIKELY (c->size > bytes_to_skip)) {
c->size -= bytes_to_skip;
c->data += bytes_to_skip;
} else {
c->data += c->size;
c->size = 0;
}
}
static inline gboolean
data_scan_ctx_ensure_data (GstTypeFind * tf, DataScanCtx * c, gint min_len)
{
const guint8 *data;
guint64 len;
guint chunk_len = MAX (DATA_SCAN_CTX_CHUNK_SIZE, min_len);
if (G_LIKELY (c->size >= min_len))
return TRUE;
data = gst_type_find_peek (tf, c->offset, chunk_len);
if (G_LIKELY (data != NULL)) {
c->data = data;
c->size = chunk_len;
return TRUE;
}
/* if there's less than our chunk size, try to get as much as we can, but
* always at least min_len bytes (we might be typefinding the first buffer
* of the stream and not have as much data available as we'd like) */
len = gst_type_find_get_length (tf);
if (len > 0) {
len = CLAMP (len - c->offset, min_len, chunk_len);
} else {
len = min_len;
}
data = gst_type_find_peek (tf, c->offset, len);
if (data != NULL) {
c->data = data;
c->size = len;
return TRUE;
}
return FALSE;
}
static inline gboolean
data_scan_ctx_memcmp (GstTypeFind * tf, DataScanCtx * c, guint offset,
const gchar * data, guint len)
{
if (!data_scan_ctx_ensure_data (tf, c, offset + len))
return FALSE;
return (memcmp (c->data + offset, data, len) == 0);
}
/*** text/plain ***/
static gboolean xml_check_first_element (GstTypeFind * tf,
const gchar * element, guint elen, gboolean strict);
static gboolean sdp_check_header (GstTypeFind * tf);
static GstStaticCaps utf8_caps = GST_STATIC_CAPS ("text/plain");
#define UTF8_CAPS gst_static_caps_get(&utf8_caps)
static gboolean
utf8_type_find_have_valid_utf8_at_offset (GstTypeFind * tf, guint64 offset,
GstTypeFindProbability * prob)
{
const guint8 *data;
/* randomly decided values */
guint min_size = 16; /* minimum size */
guint size = 32 * 1024; /* starting size */
guint probability = 95; /* starting probability */
guint step = 10; /* how much we reduce probability in each
* iteration */
while (probability > step && size > min_size) {
data = gst_type_find_peek (tf, offset, size);
if (data) {
gchar *end;
gchar *start = (gchar *) data;
if (g_utf8_validate (start, size, (const gchar **) &end) || (end - start + 4 > size)) { /* allow last char to be cut off */
*prob = probability;
return TRUE;
}
*prob = 0;
return FALSE;
}
size /= 2;
probability -= step;
}
*prob = 0;
return FALSE;
}
static void
utf8_type_find (GstTypeFind * tf, gpointer unused)
{
GstTypeFindProbability start_prob, mid_prob;
guint64 length;
/* leave xml to the xml typefinders */
if (xml_check_first_element (tf, "", 0, TRUE))
return;
/* leave sdp to the sdp typefinders */
if (sdp_check_header (tf))
return;
/* check beginning of stream */
if (!utf8_type_find_have_valid_utf8_at_offset (tf, 0, &start_prob))
return;
GST_LOG ("start is plain text with probability of %u", start_prob);
/* POSSIBLE is the highest probability we ever return if we can't
* probe into the middle of the file and don't know its length */
length = gst_type_find_get_length (tf);
if (length == 0 || length == (guint64) - 1) {
gst_type_find_suggest (tf, MIN (start_prob, GST_TYPE_FIND_POSSIBLE),
UTF8_CAPS);
return;
}
if (length < 64 * 1024) {
gst_type_find_suggest (tf, start_prob, UTF8_CAPS);
return;
}
/* check middle of stream */
if (!utf8_type_find_have_valid_utf8_at_offset (tf, length / 2, &mid_prob))
return;
GST_LOG ("middle is plain text with probability of %u", mid_prob);
gst_type_find_suggest (tf, (start_prob + mid_prob) / 2, UTF8_CAPS);
}
/*** text/utf-16 and text/utf-32} ***/
/* While UTF-8 is unicode too, using text/plain for UTF-16 and UTF-32
is going to break stuff. */
typedef struct
{
size_t bomlen;
const char *const bom;
gboolean (*checker) (const guint8 *, gint, gint);
int boost;
int endianness;
} GstUnicodeTester;
static gboolean
check_utf16 (const guint8 * data, gint len, gint endianness)
{
GstByteReader br;
guint16 high, low;
low = high = 0;
if (len & 1)
return FALSE;
gst_byte_reader_init (&br, data, len);
while (len >= 2) {
/* test first for a single 16 bit value in the BMP */
if (endianness == G_BIG_ENDIAN)
high = gst_byte_reader_get_uint16_be_unchecked (&br);
else
high = gst_byte_reader_get_uint16_le_unchecked (&br);
if (high >= 0xD800 && high <= 0xDBFF) {
/* start of a surrogate pair */
if (len < 4)
return FALSE;
len -= 2;
if (endianness == G_BIG_ENDIAN)
low = gst_byte_reader_get_uint16_be_unchecked (&br);
else
low = gst_byte_reader_get_uint16_le_unchecked (&br);
if (low >= 0xDC00 && low <= 0xDFFF) {
/* second half of the surrogate pair */
} else
return FALSE;
} else {
if (high >= 0xDC00 && high <= 0xDFFF)
return FALSE;
}
len -= 2;
}
return TRUE;
}
static gboolean
check_utf32 (const guint8 * data, gint len, gint endianness)
{
if (len & 3)
return FALSE;
while (len > 3) {
guint32 v;
if (endianness == G_BIG_ENDIAN)
v = (data[0] << 24) | (data[1] << 16) | (data[2] << 8) | data[3];
else
v = (data[3] << 24) | (data[2] << 16) | (data[1] << 8) | data[0];
if (v >= 0x10FFFF)
return FALSE;
data += 4;
len -= 4;
}
return TRUE;
}
static void
unicode_type_find (GstTypeFind * tf, const GstUnicodeTester * tester,
guint n_tester, const char *media_type, gboolean require_bom)
{
size_t n;
gint len = 4;
const guint8 *data = gst_type_find_peek (tf, 0, len);
int prob = -1;
const gint max_scan_size = 256 * 1024;
int endianness = 0;
if (!data) {
len = 2;
data = gst_type_find_peek (tf, 0, len);
if (!data)
return;
}
/* find a large enough size that works */
while (len < max_scan_size) {
size_t newlen = len << 1;
const guint8 *newdata = gst_type_find_peek (tf, 0, newlen);
if (!newdata)
break;
len = newlen;
data = newdata;
}
for (n = 0; n < n_tester; ++n) {
int bom_boost = 0, tmpprob;
if (len >= tester[n].bomlen) {
if (!memcmp (data, tester[n].bom, tester[n].bomlen))
bom_boost = tester[n].boost;
}
if (require_bom && bom_boost == 0)
continue;
if (!(*tester[n].checker) (data, len, tester[n].endianness))
continue;
tmpprob = GST_TYPE_FIND_POSSIBLE - 20 + bom_boost;
if (tmpprob > prob) {
prob = tmpprob;
endianness = tester[n].endianness;
}
}
if (prob > 0) {
GST_DEBUG ("This is valid %s %s", media_type,
endianness == G_BIG_ENDIAN ? "be" : "le");
gst_type_find_suggest_simple (tf, prob, media_type,
"endianness", G_TYPE_INT, endianness, NULL);
}
}
static GstStaticCaps utf16_caps = GST_STATIC_CAPS ("text/utf-16");
#define UTF16_CAPS gst_static_caps_get(&utf16_caps)
static void
utf16_type_find (GstTypeFind * tf, gpointer unused)
{
static const GstUnicodeTester utf16tester[2] = {
{2, "\xff\xfe", check_utf16, 10, G_LITTLE_ENDIAN},
{2, "\xfe\xff", check_utf16, 20, G_BIG_ENDIAN},
};
unicode_type_find (tf, utf16tester, G_N_ELEMENTS (utf16tester),
"text/utf-16", TRUE);
}
static GstStaticCaps utf32_caps = GST_STATIC_CAPS ("text/utf-32");
#define UTF32_CAPS gst_static_caps_get(&utf32_caps)
static void
utf32_type_find (GstTypeFind * tf, gpointer unused)
{
static const GstUnicodeTester utf32tester[2] = {
{4, "\xff\xfe\x00\x00", check_utf32, 10, G_LITTLE_ENDIAN},
{4, "\x00\x00\xfe\xff", check_utf32, 20, G_BIG_ENDIAN}
};
unicode_type_find (tf, utf32tester, G_N_ELEMENTS (utf32tester),
"text/utf-32", TRUE);
}
/*** text/uri-list ***/
static GstStaticCaps uri_caps = GST_STATIC_CAPS ("text/uri-list");
#define URI_CAPS (gst_static_caps_get(&uri_caps))
#define BUFFER_SIZE 16 /* If the string is < 16 bytes we're screwed */
#define INC_BUFFER { \
pos++; \
if (pos == BUFFER_SIZE) { \
pos = 0; \
offset += BUFFER_SIZE; \
data = gst_type_find_peek (tf, offset, BUFFER_SIZE); \
if (data == NULL) return; \
} else { \
data++; \
} \
}
static void
uri_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data = gst_type_find_peek (tf, 0, BUFFER_SIZE);
guint pos = 0;
guint offset = 0;
if (data) {
/* Search for # comment lines */
while (*data == '#') {
/* Goto end of line */
while (*data != '\n') {
INC_BUFFER;
}
INC_BUFFER;
}
if (!g_ascii_isalpha (*data)) {
/* Had a non alpha char - can't be uri-list */
return;
}
INC_BUFFER;
while (g_ascii_isalnum (*data)) {
INC_BUFFER;
}
if (*data != ':') {
/* First non alpha char is not a : */
return;
}
/* Get the next 2 bytes as well */
data = gst_type_find_peek (tf, offset + pos, 3);
if (data == NULL)
return;
if (data[1] != '/' && data[2] != '/') {
return;
}
gst_type_find_suggest (tf, GST_TYPE_FIND_LIKELY, URI_CAPS);
}
}
/*** application/x-hls ***/
static GstStaticCaps hls_caps = GST_STATIC_CAPS ("application/x-hls");
#define HLS_CAPS (gst_static_caps_get(&hls_caps))
/* See http://tools.ietf.org/html/draft-pantos-http-live-streaming-05 */
static void
hls_type_find (GstTypeFind * tf, gpointer unused)
{
DataScanCtx c = { 0, NULL, 0 };
if (G_UNLIKELY (!data_scan_ctx_ensure_data (tf, &c, 7)))
return;
if (memcmp (c.data, "#EXTM3U", 7))
return;
data_scan_ctx_advance (tf, &c, 7);
/* Check only the first 256 bytes */
while (c.offset < 256) {
if (G_UNLIKELY (!data_scan_ctx_ensure_data (tf, &c, 21)))
return;
/* Search for # comment lines */
if (c.data[0] == '#' && (memcmp (c.data, "#EXT-X-TARGETDURATION", 21) == 0
|| memcmp (c.data, "#EXT-X-STREAM-INF", 17) == 0
|| memcmp (c.data, "#EXT-X-MEDIA", 12) == 0)) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, HLS_CAPS);
return;
}
data_scan_ctx_advance (tf, &c, 1);
}
}
/*** application/xml **********************************************************/
#define XML_BUFFER_SIZE 16
#define XML_INC_BUFFER { \
pos++; \
if (pos == XML_BUFFER_SIZE) { \
pos = 0; \
offset += XML_BUFFER_SIZE; \
data = gst_type_find_peek (tf, offset, XML_BUFFER_SIZE); \
if (data == NULL) return FALSE; \
} else { \
data++; \
} \
}
#define XML_INC_BUFFER_DATA { \
pos++; \
if (pos >= length) { \
return FALSE; \
} else { \
data++; \
} \
}
static gboolean
xml_check_first_element_from_data (const guint8 * data, guint length,
const gchar * element, guint elen, gboolean strict)
{
gboolean got_xmldec;
guint pos = 0;
g_return_val_if_fail (data != NULL, FALSE);
if (length <= 5)
return FALSE;
/* look for the XMLDec
* see XML spec 2.8, Prolog and Document Type Declaration
* http://www.w3.org/TR/2004/REC-xml-20040204/#sec-prolog-dtd */
got_xmldec = (memcmp (data, "<?xml", 5) == 0);
if (strict && !got_xmldec)
return FALSE;
/* skip XMLDec in any case if we've got one */
if (got_xmldec) {
pos += 5;
data += 5;
}
/* look for the first element, it has to be the requested element. Bail
* out if it is not within the first 4kB. */
while (pos < MIN (4096, length)) {
while (*data != '<' && pos < MIN (4096, length)) {
XML_INC_BUFFER_DATA;
}
XML_INC_BUFFER_DATA;
if (!g_ascii_isalpha (*data)) {
/* if not alphabetic, it's a PI or an element / attribute declaration
* like <?xxx or <!xxx */
XML_INC_BUFFER_DATA;
continue;
}
/* the first normal element, check if it's the one asked for */
if (pos + elen + 1 >= length)
return FALSE;
return (element && strncmp ((const char *) data, element, elen) == 0);
}
return FALSE;
}
static gboolean
xml_check_first_element (GstTypeFind * tf, const gchar * element, guint elen,
gboolean strict)
{
gboolean got_xmldec;
const guint8 *data;
guint offset = 0;
guint pos = 0;
data = gst_type_find_peek (tf, 0, XML_BUFFER_SIZE);
if (!data)
return FALSE;
/* look for the XMLDec
* see XML spec 2.8, Prolog and Document Type Declaration
* http://www.w3.org/TR/2004/REC-xml-20040204/#sec-prolog-dtd */
got_xmldec = (memcmp (data, "<?xml", 5) == 0);
if (strict && !got_xmldec)
return FALSE;
/* skip XMLDec in any case if we've got one */
if (got_xmldec) {
pos += 5;
data += 5;
}
/* look for the first element, it has to be the requested element. Bail
* out if it is not within the first 4kB. */
while (data && (offset + pos) < 4096) {
while (*data != '<' && (offset + pos) < 4096) {
XML_INC_BUFFER;
}
XML_INC_BUFFER;
if (!g_ascii_isalpha (*data)) {
/* if not alphabetic, it's a PI or an element / attribute declaration
* like <?xxx or <!xxx */
XML_INC_BUFFER;
continue;
}
/* the first normal element, check if it's the one asked for */
data = gst_type_find_peek (tf, offset + pos, elen + 1);
return (data && element && strncmp ((char *) data, element, elen) == 0);
}
return FALSE;
}
static GstStaticCaps generic_xml_caps = GST_STATIC_CAPS ("application/xml");
#define GENERIC_XML_CAPS (gst_static_caps_get(&generic_xml_caps))
static void
xml_type_find (GstTypeFind * tf, gpointer unused)
{
if (xml_check_first_element (tf, "", 0, TRUE)) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MINIMUM, GENERIC_XML_CAPS);
}
}
/*** application/dash+xml ****************************************************/
static GstStaticCaps dash_caps = GST_STATIC_CAPS ("application/dash+xml");
#define DASH_CAPS gst_static_caps_get (&dash_caps)
static void
dash_mpd_type_find (GstTypeFind * tf, gpointer unused)
{
if (xml_check_first_element (tf, "MPD", 3, FALSE) ||
xml_check_first_element (tf, "mpd", 3, FALSE)) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, DASH_CAPS);
}
}
/*** application/sdp *********************************************************/
static GstStaticCaps sdp_caps = GST_STATIC_CAPS ("application/sdp");
#define SDP_CAPS (gst_static_caps_get(&sdp_caps))
static gboolean
sdp_check_header (GstTypeFind * tf)
{
const guint8 *data;
data = gst_type_find_peek (tf, 0, 5);
if (!data)
return FALSE;
/* sdp must start with v=0[\r]\n */
if (memcmp (data, "v=0", 3))
return FALSE;
if (data[3] == '\r' && data[4] == '\n')
return TRUE;
if (data[3] == '\n')
return TRUE;
return FALSE;
}
static void
sdp_type_find (GstTypeFind * tf, gpointer unused)
{
if (sdp_check_header (tf))
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, SDP_CAPS);
}
/*** application/smil *********************************************************/
static GstStaticCaps smil_caps = GST_STATIC_CAPS ("application/smil");
#define SMIL_CAPS (gst_static_caps_get(&smil_caps))
static void
smil_type_find (GstTypeFind * tf, gpointer unused)
{
if (xml_check_first_element (tf, "smil", 4, FALSE)) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, SMIL_CAPS);
}
}
/*** application/ttml+xml *****************************************************/
static GstStaticCaps ttml_xml_caps = GST_STATIC_CAPS ("application/ttml+xml");
#define TTML_XML_CAPS (gst_static_caps_get(&ttml_xml_caps))
static void
ttml_xml_type_find (GstTypeFind * tf, gpointer unused)
{
if (xml_check_first_element (tf, "tt", 2, FALSE)) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, TTML_XML_CAPS);
}
}
/*** text/html ***/
static GstStaticCaps html_caps = GST_STATIC_CAPS ("text/html");
#define HTML_CAPS gst_static_caps_get (&html_caps)
static void
html_type_find (GstTypeFind * tf, gpointer unused)
{
const gchar *d, *data;
data = (const gchar *) gst_type_find_peek (tf, 0, 16);
if (!data)
return;
if (!g_ascii_strncasecmp (data, "<!DOCTYPE HTML", 14)) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, HTML_CAPS);
} else if (xml_check_first_element (tf, "html", 4, FALSE)) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, HTML_CAPS);
} else if ((d = memchr (data, '<', 16))) {
data = (const gchar *) gst_type_find_peek (tf, d - data, 6);
if (data && g_ascii_strncasecmp (data, "<html>", 6) == 0) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, HTML_CAPS);
}
}
}
/*** audio/midi ***/
static GstStaticCaps mid_caps = GST_STATIC_CAPS ("audio/midi");
#define MID_CAPS gst_static_caps_get(&mid_caps)
static void
mid_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data = gst_type_find_peek (tf, 0, 4);
/* http://jedi.ks.uiuc.edu/~johns/links/music/midifile.html */
if (data && data[0] == 'M' && data[1] == 'T' && data[2] == 'h'
&& data[3] == 'd')
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, MID_CAPS);
}
/*** audio/mobile-xmf ***/
static GstStaticCaps mxmf_caps = GST_STATIC_CAPS ("audio/mobile-xmf");
#define MXMF_CAPS gst_static_caps_get(&mxmf_caps)
static void
mxmf_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data = NULL;
/* Search FileId "XMF_" 4 bytes */
data = gst_type_find_peek (tf, 0, 4);
if (data && data[0] == 'X' && data[1] == 'M' && data[2] == 'F'
&& data[3] == '_') {
/* Search Format version "2.00" 4 bytes */
data = gst_type_find_peek (tf, 4, 4);
if (data && data[0] == '2' && data[1] == '.' && data[2] == '0'
&& data[3] == '0') {
/* Search TypeId 2 1 byte */
data = gst_type_find_peek (tf, 11, 1);
if (data && data[0] == 2) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, MXMF_CAPS);
}
}
}
}
/*** video/x-fli ***/
static GstStaticCaps flx_caps = GST_STATIC_CAPS ("video/x-fli");
#define FLX_CAPS gst_static_caps_get(&flx_caps)
static void
flx_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data = gst_type_find_peek (tf, 0, 134);
if (data) {
/* check magic and the frame type of the first frame */
if ((data[4] == 0x11 || data[4] == 0x12 ||
data[4] == 0x30 || data[4] == 0x44) &&
data[5] == 0xaf &&
((data[132] == 0x00 || data[132] == 0xfa) && data[133] == 0xf1)) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, FLX_CAPS);
}
return;
}
data = gst_type_find_peek (tf, 0, 6);
if (data) {
/* check magic only */
if ((data[4] == 0x11 || data[4] == 0x12 ||
data[4] == 0x30 || data[4] == 0x44) && data[5] == 0xaf) {
gst_type_find_suggest (tf, GST_TYPE_FIND_LIKELY, FLX_CAPS);
}
return;
}
}
/*** application/x-id3 ***/
static GstStaticCaps id3_caps = GST_STATIC_CAPS ("application/x-id3");
#define ID3_CAPS gst_static_caps_get(&id3_caps)
static void
id3v2_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data = gst_type_find_peek (tf, 0, 10);
if (data && memcmp (data, "ID3", 3) == 0 &&
data[3] != 0xFF && data[4] != 0xFF &&
(data[6] & 0x80) == 0 && (data[7] & 0x80) == 0 &&
(data[8] & 0x80) == 0 && (data[9] & 0x80) == 0) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, ID3_CAPS);
}
}
static void
id3v1_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data = gst_type_find_peek (tf, -128, 3);
if (data && memcmp (data, "TAG", 3) == 0) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, ID3_CAPS);
}
}
/*** application/x-ape ***/
static GstStaticCaps apetag_caps = GST_STATIC_CAPS ("application/x-apetag");
#define APETAG_CAPS gst_static_caps_get(&apetag_caps)
static void
apetag_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data;
/* APEv1/2 at start of file */
data = gst_type_find_peek (tf, 0, 8);
if (data && !memcmp (data, "APETAGEX", 8)) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, APETAG_CAPS);
return;
}
/* APEv1/2 at end of file */
data = gst_type_find_peek (tf, -32, 8);
if (data && !memcmp (data, "APETAGEX", 8)) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, APETAG_CAPS);
return;
}
}
/*** audio/x-ttafile ***/
static GstStaticCaps tta_caps = GST_STATIC_CAPS ("audio/x-ttafile");
#define TTA_CAPS gst_static_caps_get(&tta_caps)
static void
tta_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data = gst_type_find_peek (tf, 0, 3);
if (data) {
if (memcmp (data, "TTA", 3) == 0) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, TTA_CAPS);
return;
}
}
}
/*** audio/x-flac ***/
static GstStaticCaps flac_caps = GST_STATIC_CAPS ("audio/x-flac");
#define FLAC_CAPS (gst_static_caps_get(&flac_caps))
static void
flac_type_find (GstTypeFind * tf, gpointer unused)
{
DataScanCtx c = { 0, NULL, 0 };
if (G_UNLIKELY (!data_scan_ctx_ensure_data (tf, &c, 4)))
return;
/* standard flac (also old/broken flac-in-ogg with an initial 4-byte marker
* packet and without the usual packet framing) */
if (memcmp (c.data, "fLaC", 4) == 0) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, FLAC_CAPS);
return;
}
if (G_UNLIKELY (!data_scan_ctx_ensure_data (tf, &c, 6)))
return;
/* flac-in-ogg, see http://flac.sourceforge.net/ogg_mapping.html */
if (memcmp (c.data, "\177FLAC\001", 6) == 0) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, FLAC_CAPS);
return;
}
/* disabled because it happily typefinds /dev/urandom as audio/x-flac, and
* because I yet have to see header-less flac in the wild */
#if 0
/* flac without headers (subset format) */
/* 64K should be enough */
while (c.offset < (64 * 1024)) {
if (G_UNLIKELY (!data_scan_ctx_ensure_data (tf, &c, 4)))
break;
/* look for frame header,
* http://flac.sourceforge.net/format.html#frame_header
*/
if (c.data[0] == 0xff && (c.data[1] >> 2) == 0x3e) {
/* bit 15 in the header must be 0 */
if (((c.data[1] >> 1) & 0x01) == 0x01)
goto advance;
/* blocksize must be != 0x00 */
if ((c.data[2] >> 4) == 0x00)
goto advance;
/* samplerate must be != 0x0f */
if ((c.data[2] & 0x0f) == 0x0f)
goto advance;
/* also 0 is invalid, as it means get the info from the header and we
* don't have headers if we are here */
if ((c.data[2] & 0x0f) == 0x00)
goto advance;
/* channel assignment must be < 11 */
if ((c.data[3] >> 4) >= 11)
goto advance;
/* sample size must be != 0x07 and != 0x05 */
if (((c.data[3] >> 1) & 0x07) == 0x07)
goto advance;
if (((c.data[3] >> 1) & 0x07) == 0x05)
goto advance;
/* also 0 is invalid, as it means get the info from the header and we
* don't have headers if we are here */
if (((c.data[3] >> 1) & 0x07) == 0x00)
goto advance;
/* next bit must be 0 */
if ((c.data[3] & 0x01) == 0x01)
goto advance;
/* FIXME: shouldn't we include the crc check ? */
GST_DEBUG ("Found flac without headers at %d", (gint) c.offset);
gst_type_find_suggest (tf, GST_TYPE_FIND_POSSIBLE, FLAC_CAPS);
return;
}
advance:
data_scan_ctx_advance (tf, &c, 1);
}
#endif
}
/* TODO: we could probably make a generic function for this.. */
static gint
aac_type_find_scan_loas_frames_ep (GstTypeFind * tf, DataScanCtx * scan_ctx,
gint max_frames)
{
DataScanCtx c = *scan_ctx;
guint16 snc;
guint len;
gint count = 0;
do {
if (!data_scan_ctx_ensure_data (tf, &c, 5))
break;
/* EPAudioSyncStream */
len = ((c.data[2] & 0x0f) << 9) | (c.data[3] << 1) |
((c.data[4] & 0x80) >> 7);
if (len == 0 || !data_scan_ctx_ensure_data (tf, &c, len + 2)) {
GST_DEBUG ("Wrong sync or next frame not within reach, len=%u", len);
break;
}
/* check length of frame */
snc = GST_READ_UINT16_BE (c.data + len);
if (snc != 0x4de1) {
GST_DEBUG ("No sync found at 0x%" G_GINT64_MODIFIER "x", c.offset + len);
break;
}
++count;
GST_DEBUG ("Found LOAS syncword #%d at offset 0x%" G_GINT64_MODIFIER "x, "
"framelen %u", count, c.offset, len);
data_scan_ctx_advance (tf, &c, len);
} while (count < max_frames && (c.offset - scan_ctx->offset) < 64 * 1024);
GST_DEBUG ("found %d consecutive frames", count);
return count;
}
static gint
aac_type_find_scan_loas_frames (GstTypeFind * tf, DataScanCtx * scan_ctx,
gint max_frames)
{
DataScanCtx c = *scan_ctx;
guint16 snc;
guint len;
gint count = 0;
do {
if (!data_scan_ctx_ensure_data (tf, &c, 3))
break;
/* AudioSyncStream */
len = ((c.data[1] & 0x1f) << 8) | c.data[2];
/* add size of sync stream header */
len += 3;
if (len == 0 || !data_scan_ctx_ensure_data (tf, &c, len + 2)) {
GST_DEBUG ("Wrong sync or next frame not within reach, len=%u", len);
break;
}
/* check length of frame */
snc = GST_READ_UINT16_BE (c.data + len);
if ((snc & 0xffe0) != 0x56e0) {
GST_DEBUG ("No sync found at 0x%" G_GINT64_MODIFIER "x", c.offset + len);
break;
}
++count;
GST_DEBUG ("Found LOAS syncword #%d at offset 0x%" G_GINT64_MODIFIER "x, "
"framelen %u", count, c.offset, len);
data_scan_ctx_advance (tf, &c, len);
} while (count < max_frames && (c.offset - scan_ctx->offset) < 64 * 1024);
GST_DEBUG ("found %d consecutive frames", count);
return count;
}
/*** audio/mpeg version 2, 4 ***/
static GstStaticCaps aac_caps = GST_STATIC_CAPS ("audio/mpeg, "
"mpegversion = (int) { 2, 4 }, framed = (bool) false");
#define AAC_CAPS (gst_static_caps_get(&aac_caps))
#define AAC_AMOUNT (4096)
static void
aac_type_find (GstTypeFind * tf, gpointer unused)
{
DataScanCtx c = { 0, NULL, 0 };
GstTypeFindProbability best_probability = GST_TYPE_FIND_NONE;
GstCaps *best_caps = NULL;
guint best_count = 0;
while (c.offset < AAC_AMOUNT) {
guint snc, len, offset, i;
/* detect adts header or adif header.
* The ADIF header is 4 bytes, that should be OK. The ADTS header, on
* the other hand, is 14 bits only, so we require one valid frame with
* again a valid syncpoint on the next one (28 bits) for certainty. We
* require 4 kB, which is quite a lot, since frames are generally 200-400
* bytes.
* LOAS has 2 possible syncwords, which are 11 bits and 16 bits long.
* The following stream syntax depends on which one is found.
*/
if (G_UNLIKELY (!data_scan_ctx_ensure_data (tf, &c, 6)))
break;
snc = GST_READ_UINT16_BE (c.data);
if (G_UNLIKELY ((snc & 0xfff6) == 0xfff0)) {
/* ADTS header - find frame length */
GST_DEBUG ("Found one ADTS syncpoint at offset 0x%" G_GINT64_MODIFIER
"x, tracing next...", c.offset);
len = ((c.data[3] & 0x03) << 11) |
(c.data[4] << 3) | ((c.data[5] & 0xe0) >> 5);
if (len == 0 || !data_scan_ctx_ensure_data (tf, &c, len + 6)) {
GST_DEBUG ("Wrong sync or next frame not within reach, len=%u", len);
goto next;
}
offset = len;
/* check if there's a second ADTS frame */
snc = GST_READ_UINT16_BE (c.data + offset);
if ((snc & 0xfff6) == 0xfff0) {
GstCaps *caps;
guint mpegversion, sample_freq_idx, channel_config, profile_idx, rate;
guint8 audio_config[2];
mpegversion = (c.data[1] & 0x08) ? 2 : 4;
profile_idx = c.data[2] >> 6;
sample_freq_idx = ((c.data[2] & 0x3c) >> 2);
channel_config = ((c.data[2] & 0x01) << 2) + (c.data[3] >> 6);
GST_DEBUG ("Found second ADTS-%d syncpoint at offset 0x%"
G_GINT64_MODIFIER "x, framelen %u", mpegversion, c.offset, len);
/* 0xd and 0xe are reserved. 0xf means the sample frequency is directly
* specified in the header, but that's not allowed for ADTS */
if (sample_freq_idx > 0xc) {
GST_DEBUG ("Unexpected sample frequency index %d or wrong sync",
sample_freq_idx);
goto next;
}
rate = gst_codec_utils_aac_get_sample_rate_from_index (sample_freq_idx);
GST_LOG ("ADTS: profile=%u, rate=%u", profile_idx, rate);
/* The ADTS frame header is slightly different from the
* AudioSpecificConfig defined for the MPEG-4 container, so we just
* construct enough of it for getting the level here. */
/* ADTS counts profiles from 0 instead of 1 to save bits */
audio_config[0] = (profile_idx + 1) << 3;
audio_config[0] |= (sample_freq_idx >> 1) & 0x7;
audio_config[1] = (sample_freq_idx & 0x1) << 7;
audio_config[1] |= (channel_config & 0xf) << 3;
caps = gst_caps_new_simple ("audio/mpeg",
"framed", G_TYPE_BOOLEAN, FALSE,
"mpegversion", G_TYPE_INT, mpegversion,
"stream-format", G_TYPE_STRING, "adts", NULL);
gst_codec_utils_aac_caps_set_level_and_profile (caps, audio_config, 2);
/* add rate and number of channels if we can */
if (channel_config != 0 && channel_config <= 7) {
const guint channels_map[] = { 0, 1, 2, 3, 4, 5, 6, 8 };
gst_caps_set_simple (caps, "channels", G_TYPE_INT,
channels_map[channel_config], "rate", G_TYPE_INT, rate, NULL);
}
/* length of the second ADTS frame */
len = ((c.data[offset + 3] & 0x03) << 11) |
(c.data[offset + 4] << 3) | ((c.data[offset + 5] & 0xe0) >> 5);
if (len == 0 || !data_scan_ctx_ensure_data (tf, &c, offset + len + 6)) {
GST_DEBUG ("Wrong sync or next frame not within reach, len=%u", len);
gst_type_find_suggest (tf, GST_TYPE_FIND_LIKELY, caps);
} else {
offset += len;
/* find more aac sync to select correctly */
/* check if there's a third/fourth/fifth/sixth ADTS frame, if there is a sixth frame, set probability to maximum:100% */
for (i = 3; i <= 6; i++) {
len = ((c.data[offset + 3] & 0x03) << 11) |
(c.data[offset + 4] << 3) | ((c.data[offset + 5] & 0xe0) >> 5);
if (len == 0
|| !data_scan_ctx_ensure_data (tf, &c, offset + len + 6)) {
GST_DEBUG ("Wrong sync or next frame not within reach, len=%u",
len);
break;
}
snc = GST_READ_UINT16_BE (c.data + offset);
if ((snc & 0xfff6) == 0xfff0) {
GST_DEBUG ("Find %und Sync..probability is %u ", i,
GST_TYPE_FIND_LIKELY + 5 * (i - 2));
offset += len;
} else {
break;
}
}
gst_type_find_suggest (tf, GST_TYPE_FIND_LIKELY + 5 * (i - 3), caps);
}
gst_caps_unref (caps);
break;
}
GST_DEBUG ("No next frame found... (should have been at 0x%x)", len);
} else if (G_UNLIKELY ((snc & 0xffe0) == 0x56e0 || snc == 0x4de1)) {
gint count;
/* LOAS frame */
GST_INFO ("Possible LOAS syncword at offset 0x%" G_GINT64_MODIFIER
"x, scanning for more frames...", c.offset);
if (snc == 0x4de1)
count = aac_type_find_scan_loas_frames_ep (tf, &c, 20);
else
count = aac_type_find_scan_loas_frames (tf, &c, 20);
if (count >= 3 && count > best_count) {
gst_caps_replace (&best_caps, NULL);
best_caps = gst_caps_new_simple ("audio/mpeg",
"framed", G_TYPE_BOOLEAN, FALSE,
"mpegversion", G_TYPE_INT, 4,
"stream-format", G_TYPE_STRING, "loas", NULL);
best_count = count;
best_probability = GST_TYPE_FIND_POSSIBLE - 10 + count * 3;
if (best_probability >= GST_TYPE_FIND_LIKELY)
break;
}
} else if (!memcmp (c.data, "ADIF", 4)) {
/* ADIF header */
gst_type_find_suggest_simple (tf, GST_TYPE_FIND_LIKELY, "audio/mpeg",
"framed", G_TYPE_BOOLEAN, FALSE, "mpegversion", G_TYPE_INT, 4,
"stream-format", G_TYPE_STRING, "adif", NULL);
break;
}
next:
data_scan_ctx_advance (tf, &c, 1);
}
if (best_probability > GST_TYPE_FIND_NONE) {
gst_type_find_suggest (tf, best_probability, best_caps);
gst_caps_unref (best_caps);
}
}
/*** audio/mpeg version 1 ***/
/*
* The chance that random data is identified as a valid mp3 header is 63 / 2^18
* (0.024%) per try. This makes the function for calculating false positives
* 1 - (1 - ((63 / 2 ^18) ^ GST_MP3_TYPEFIND_MIN_HEADERS)) ^ buffersize)
* This has the following probabilities of false positives:
* datasize MIN_HEADERS
* (bytes) 1 2 3 4
* 4096 62.6% 0.02% 0% 0%
* 16384 98% 0.09% 0% 0%
* 1 MiB 100% 5.88% 0% 0%
* 1 GiB 100% 100% 1.44% 0%
* 1 TiB 100% 100% 100% 0.35%
* This means that the current choice (3 headers by most of the time 4096 byte
* buffers is pretty safe for now.
*
* The max. size of each frame is 1440 bytes, which means that for N frames to
* be detected, we need 1440 * GST_MP3_TYPEFIND_MIN_HEADERS + 3 bytes of data.
* Assuming we step into the stream right after the frame header, this
* means we need 1440 * (GST_MP3_TYPEFIND_MIN_HEADERS + 1) - 1 + 3 bytes
* of data (5762) to always detect any mp3.
*/
static const guint mp3types_bitrates[2][3][16] =
{ {{0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448,},
{0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384,},
{0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320,}},
{{0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256,},
{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160,},
{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160,}},
};
static const guint mp3types_freqs[3][3] = { {11025, 12000, 8000},
{22050, 24000, 16000},
{44100, 48000, 32000}
};
static inline guint
mp3_type_frame_length_from_header (guint32 header, guint * put_layer,
guint * put_channels, guint * put_bitrate, guint * put_samplerate,
gboolean * may_be_free_format, gint possible_free_framelen)
{
guint bitrate, layer, length, mode, samplerate, version, channels;
if ((header & 0xffe00000) != 0xffe00000)
return 0;
/* we don't need extension, copyright, original or
* emphasis for the frame length */
header >>= 6;
/* mode */
mode = header & 0x3;
header >>= 3;
/* padding */
length = header & 0x1;
header >>= 1;
/* sampling frequency */
samplerate = header & 0x3;
if (samplerate == 3)
return 0;
header >>= 2;
/* bitrate index */
bitrate = header & 0xF;
if (bitrate == 0 && possible_free_framelen == -1) {
GST_LOG ("Possibly a free format mp3 - signaling");
*may_be_free_format = TRUE;
}
if (bitrate == 15 || (bitrate == 0 && possible_free_framelen == -1))
return 0;
/* ignore error correction, too */
header >>= 5;
/* layer */
layer = 4 - (header & 0x3);
if (layer == 4)
return 0;
header >>= 2;
/* version 0=MPEG2.5; 2=MPEG2; 3=MPEG1 */
version = header & 0x3;
if (version == 1)
return 0;
/* lookup */
channels = (mode == 3) ? 1 : 2;
samplerate = mp3types_freqs[version > 0 ? version - 1 : 0][samplerate];
if (bitrate == 0) {
/* possible freeform mp3 */
if (layer == 1) {
length *= 4;
length += possible_free_framelen;
bitrate = length * samplerate / 48000;
} else {
length += possible_free_framelen;
bitrate = length * samplerate /
((layer == 3 && version != 3) ? 72000 : 144000);
}
/* freeform mp3 should have a higher-than-usually-allowed bitrate */
GST_LOG ("calculated bitrate: %u, max usually: %u", bitrate,
mp3types_bitrates[version == 3 ? 0 : 1][layer - 1][14]);
if (bitrate < mp3types_bitrates[version == 3 ? 0 : 1][layer - 1][14])
return 0;
} else {
/* calculating */
bitrate = mp3types_bitrates[version == 3 ? 0 : 1][layer - 1][bitrate];
if (layer == 1) {
length = ((12000 * bitrate / samplerate) + length) * 4;
} else {
length += ((layer == 3
&& version != 3) ? 72000 : 144000) * bitrate / samplerate;
}
}
GST_LOG ("mp3typefind: calculated mp3 frame length of %u bytes", length);
GST_LOG
("mp3typefind: samplerate = %u - bitrate = %u - layer = %u - version = %u"
" - channels = %u", samplerate, bitrate, layer, version, channels);
if (put_layer)
*put_layer = layer;
if (put_channels)
*put_channels = channels;
if (put_bitrate)
*put_bitrate = bitrate;
if (put_samplerate)
*put_samplerate = samplerate;
return length;
}
static GstStaticCaps mp3_caps = GST_STATIC_CAPS ("audio/mpeg, "
"mpegversion = (int) 1, layer = (int) [ 1, 3 ]");
#define MP3_CAPS (gst_static_caps_get(&mp3_caps))
/*
* random values for typefinding
* if no more data is available, we will return a probability of
* (found_headers/TRY_HEADERS) * (MAXIMUM * (TRY_SYNC - bytes_skipped)
* / TRY_SYNC)
* if found_headers >= MIN_HEADERS
*/
#define GST_MP3_TYPEFIND_MIN_HEADERS (2)
#define GST_MP3_TYPEFIND_TRY_HEADERS (5)
#define GST_MP3_TYPEFIND_TRY_SYNC (GST_TYPE_FIND_MAXIMUM * 100) /* 10kB */
#define GST_MP3_TYPEFIND_SYNC_SIZE (2048)
#define GST_MP3_WRONG_HEADER (10)
static void
mp3_type_find_at_offset (GstTypeFind * tf, guint64 start_off,
guint * found_layer, GstTypeFindProbability * found_prob)
{
const guint8 *data = NULL;
const guint8 *data_end = NULL;
guint size;
guint64 skipped;
gint last_free_offset = -1;
gint last_free_framelen = -1;
gboolean headerstart = TRUE;
*found_layer = 0;
*found_prob = 0;
size = 0;
skipped = 0;
while (skipped < GST_MP3_TYPEFIND_TRY_SYNC) {
if (size <= 0) {
size = GST_MP3_TYPEFIND_SYNC_SIZE * 2;
do {
size /= 2;
data = gst_type_find_peek (tf, skipped + start_off, size);
} while (size > 10 && !data);
if (!data)
break;
data_end = data + size;
}
if (*data == 0xFF) {
const guint8 *head_data = NULL;
guint layer = 0, bitrate, samplerate, channels;
guint found = 0; /* number of valid headers found */
guint64 offset = skipped;
gboolean changed = FALSE;
while (found < GST_MP3_TYPEFIND_TRY_HEADERS) {
guint32 head;
guint length;
guint prev_layer = 0;
guint prev_channels = 0, prev_samplerate = 0;
gboolean free = FALSE;
if ((gint64) (offset - skipped + 4) >= 0 &&
data + offset - skipped + 4 < data_end) {
head_data = data + offset - skipped;
} else {
head_data = gst_type_find_peek (tf, offset + start_off, 4);
}
if (!head_data)
break;
head = GST_READ_UINT32_BE (head_data);
if (!(length = mp3_type_frame_length_from_header (head, &layer,
&channels, &bitrate, &samplerate, &free,
last_free_framelen))) {
if (free) {
if (last_free_offset == -1)
last_free_offset = offset;
else {
last_free_framelen = offset - last_free_offset;
offset = last_free_offset;
continue;
}
} else {
last_free_framelen = -1;
}
/* Mark the fact that we didn't find a valid header at the beginning */
if (found == 0)
headerstart = FALSE;
GST_LOG ("%d. header at offset %" G_GUINT64_FORMAT
" (0x%" G_GINT64_MODIFIER "x) was not an mp3 header "
"(possibly-free: %s)", found + 1, start_off + offset,
start_off + offset, free ? "yes" : "no");
break;
}
if ((prev_layer && prev_layer != layer) ||
/* (prev_bitrate && prev_bitrate != bitrate) || <-- VBR */
(prev_samplerate && prev_samplerate != samplerate) ||
(prev_channels && prev_channels != channels)) {
/* this means an invalid property, or a change, which might mean
* that this is not a mp3 but just a random bytestream. It could
* be a freaking funky encoded mp3 though. We'll just not count
* this header*/
if (prev_layer)
changed = TRUE;
prev_layer = layer;
prev_channels = channels;
prev_samplerate = samplerate;
} else {
found++;
GST_LOG ("found %d. header at offset %" G_GUINT64_FORMAT " (0x%"
G_GINT64_MODIFIER "X)", found, start_off + offset,
start_off + offset);
}
offset += length;
}
g_assert (found <= GST_MP3_TYPEFIND_TRY_HEADERS);
if (found != 0 && head_data == NULL &&
gst_type_find_peek (tf, offset + start_off - 1, 1) == NULL)
/* Incomplete last frame - don't count it. */
found--;
if (found == GST_MP3_TYPEFIND_TRY_HEADERS ||
(found >= GST_MP3_TYPEFIND_MIN_HEADERS && head_data == NULL)) {
/* we can make a valid guess */
guint probability = found * GST_TYPE_FIND_MAXIMUM *
(GST_MP3_TYPEFIND_TRY_SYNC - skipped) /
GST_MP3_TYPEFIND_TRY_HEADERS / GST_MP3_TYPEFIND_TRY_SYNC;
if (!headerstart
&& probability > (GST_TYPE_FIND_MINIMUM + GST_MP3_WRONG_HEADER))
probability -= GST_MP3_WRONG_HEADER;
if (probability < GST_TYPE_FIND_MINIMUM)
probability = GST_TYPE_FIND_MINIMUM;
if (start_off > 0)
probability /= 2;
if (!changed)
probability = (probability + GST_TYPE_FIND_MAXIMUM) / 2;
GST_INFO
("audio/mpeg calculated %u = %u * %u / %u * (%u - %"
G_GUINT64_FORMAT ") / %u", probability, GST_TYPE_FIND_MAXIMUM,
found, GST_MP3_TYPEFIND_TRY_HEADERS, GST_MP3_TYPEFIND_TRY_SYNC,
(guint64) skipped, GST_MP3_TYPEFIND_TRY_SYNC);
/* make sure we're not id3 tagged */
head_data = gst_type_find_peek (tf, -128, 3);
if (head_data && (memcmp (head_data, "TAG", 3) == 0)) {
probability = 0;
}
g_assert (probability <= GST_TYPE_FIND_MAXIMUM);
*found_prob = probability;
if (probability > 0)
*found_layer = layer;
return;
}
}
data++;
skipped++;
size--;
}
}
static void
mp3_type_find (GstTypeFind * tf, gpointer unused)
{
GstTypeFindProbability prob, mid_prob;
const guint8 *data;
guint layer, mid_layer;
guint64 length;
mp3_type_find_at_offset (tf, 0, &layer, &prob);
length = gst_type_find_get_length (tf);
if (length == 0 || length == (guint64) - 1) {
if (prob != 0)
goto suggest;
return;
}
/* if we're pretty certain already, skip the additional check */
if (prob >= GST_TYPE_FIND_LIKELY)
goto suggest;
mp3_type_find_at_offset (tf, length / 2, &mid_layer, &mid_prob);
if (mid_prob > 0) {
if (prob == 0) {
GST_LOG ("detected audio/mpeg only in the middle (p=%u)", mid_prob);
layer = mid_layer;
prob = mid_prob;
goto suggest;
}
if (layer != mid_layer) {
GST_WARNING ("audio/mpeg layer discrepancy: %u vs. %u", layer, mid_layer);
return; /* FIXME: or should we just go with the one in the middle? */
}
/* detected mpeg audio both in middle of the file and at the start */
prob = (prob + mid_prob) / 2;
goto suggest;
}
/* a valid header right at the start makes it more likely
* that this is actually plain mpeg-1 audio */
if (prob > 0) {
data = gst_type_find_peek (tf, 0, 4); /* use min. frame size? */
if (data && mp3_type_frame_length_from_header (GST_READ_UINT32_BE (data),
&layer, NULL, NULL, NULL, NULL, 0) != 0) {
prob = MIN (prob + 10, GST_TYPE_FIND_MAXIMUM);
}
}
if (prob > 0)
goto suggest;
return;
suggest:
{
g_return_if_fail (layer >= 1 && layer <= 3);
gst_type_find_suggest_simple (tf, prob, "audio/mpeg",
"mpegversion", G_TYPE_INT, 1, "layer", G_TYPE_INT, layer,
"parsed", G_TYPE_BOOLEAN, FALSE, NULL);
}
}
/*** audio/x-musepack ***/
static GstStaticCaps musepack_caps =
GST_STATIC_CAPS ("audio/x-musepack, streamversion= (int) { 7, 8 }");
#define MUSEPACK_CAPS (gst_static_caps_get(&musepack_caps))
static void
musepack_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data = gst_type_find_peek (tf, 0, 4);
GstTypeFindProbability prop = GST_TYPE_FIND_MINIMUM;
gint streamversion = -1;
if (data && memcmp (data, "MP+", 3) == 0) {
streamversion = 7;
if ((data[3] & 0x7f) == 7) {
prop = GST_TYPE_FIND_MAXIMUM;
} else {
prop = GST_TYPE_FIND_LIKELY + 10;
}
} else if (data && memcmp (data, "MPCK", 4) == 0) {
streamversion = 8;
prop = GST_TYPE_FIND_MAXIMUM;
}
if (streamversion != -1) {
gst_type_find_suggest_simple (tf, prop, "audio/x-musepack",
"streamversion", G_TYPE_INT, streamversion, NULL);
}
}
/*** audio/x-ac3 ***/
/* FIXME 0.11: should be audio/ac3, but isn't for backwards compatibility */
static GstStaticCaps ac3_caps = GST_STATIC_CAPS ("audio/x-ac3");
#define AC3_CAPS (gst_static_caps_get(&ac3_caps))
static GstStaticCaps eac3_caps = GST_STATIC_CAPS ("audio/x-eac3");
#define EAC3_CAPS (gst_static_caps_get(&eac3_caps))
struct ac3_frmsize
{
unsigned short bit_rate;
unsigned short frm_size[3];
};
static const struct ac3_frmsize ac3_frmsizecod_tbl[] = {
{32, {64, 69, 96}},
{32, {64, 70, 96}},
{40, {80, 87, 120}},
{40, {80, 88, 120}},
{48, {96, 104, 144}},
{48, {96, 105, 144}},
{56, {112, 121, 168}},
{56, {112, 122, 168}},
{64, {128, 139, 192}},
{64, {128, 140, 192}},
{80, {160, 174, 240}},
{80, {160, 175, 240}},
{96, {192, 208, 288}},
{96, {192, 209, 288}},
{112, {224, 243, 336}},
{112, {224, 244, 336}},
{128, {256, 278, 384}},
{128, {256, 279, 384}},
{160, {320, 348, 480}},
{160, {320, 349, 480}},
{192, {384, 417, 576}},
{192, {384, 418, 576}},
{224, {448, 487, 672}},
{224, {448, 488, 672}},
{256, {512, 557, 768}},
{256, {512, 558, 768}},
{320, {640, 696, 960}},
{320, {640, 697, 960}},
{384, {768, 835, 1152}},
{384, {768, 836, 1152}},
{448, {896, 975, 1344}},
{448, {896, 976, 1344}},
{512, {1024, 1114, 1536}},
{512, {1024, 1115, 1536}},
{576, {1152, 1253, 1728}},
{576, {1152, 1254, 1728}},
{640, {1280, 1393, 1920}},
{640, {1280, 1394, 1920}}
};
static void
ac3_type_find (GstTypeFind * tf, gpointer unused)
{
DataScanCtx c = { 0, NULL, 0 };
/* Search for an ac3 frame; not necessarily right at the start, but give it
* a lower probability if not found right at the start. Check that the
* frame is followed by a second frame at the expected offset.
* We could also check the two ac3 CRCs, but we don't do that right now */
while (c.offset < 1024) {
if (G_UNLIKELY (!data_scan_ctx_ensure_data (tf, &c, 5)))
break;
if (c.data[0] == 0x0b && c.data[1] == 0x77) {
guint bsid = c.data[5] >> 3;
if (bsid <= 8) {
/* ac3 */
guint fscod = c.data[4] >> 6;
guint frmsizecod = c.data[4] & 0x3f;
if (fscod < 3 && frmsizecod < 38) {
DataScanCtx c_next = c;
guint frame_size;
frame_size = ac3_frmsizecod_tbl[frmsizecod].frm_size[fscod];
GST_LOG ("possible AC3 frame sync at offset %"
G_GUINT64_FORMAT ", size=%u", c.offset, frame_size);
if (data_scan_ctx_ensure_data (tf, &c_next, (frame_size * 2) + 5)) {
data_scan_ctx_advance (tf, &c_next, frame_size * 2);
if (c_next.data[0] == 0x0b && c_next.data[1] == 0x77) {
fscod = c_next.data[4] >> 6;
frmsizecod = c_next.data[4] & 0x3f;
if (fscod < 3 && frmsizecod < 38) {
GstTypeFindProbability prob;
GST_LOG ("found second AC3 frame (size=%u), looks good",
ac3_frmsizecod_tbl[frmsizecod].frm_size[fscod]);
if (c.offset == 0)
prob = GST_TYPE_FIND_MAXIMUM;
else
prob = GST_TYPE_FIND_NEARLY_CERTAIN;
gst_type_find_suggest (tf, prob, AC3_CAPS);
return;
}
} else {
GST_LOG ("no second AC3 frame found, false sync");
}
}
}
} else if (bsid <= 16 && bsid > 10) {
/* eac3 */
DataScanCtx c_next = c;
guint frame_size;
frame_size = (((c.data[2] & 0x07) << 8) + c.data[3]) + 1;
GST_LOG ("possible E-AC3 frame sync at offset %"
G_GUINT64_FORMAT ", size=%u", c.offset, frame_size);
if (data_scan_ctx_ensure_data (tf, &c_next, (frame_size * 2) + 5)) {
data_scan_ctx_advance (tf, &c_next, frame_size * 2);
if (c_next.data[0] == 0x0b && c_next.data[1] == 0x77) {
GstTypeFindProbability prob;
GST_LOG ("found second E-AC3 frame, looks good");
if (c.offset == 0)
prob = GST_TYPE_FIND_MAXIMUM;
else
prob = GST_TYPE_FIND_NEARLY_CERTAIN;
gst_type_find_suggest (tf, prob, EAC3_CAPS);
return;
} else {
GST_LOG ("no second E-AC3 frame found, false sync");
}
}
} else {
GST_LOG ("invalid AC3 BSID: %u", bsid);
}
}
data_scan_ctx_advance (tf, &c, 1);
}
}
/*** audio/x-dts ***/
static GstStaticCaps dts_caps = GST_STATIC_CAPS ("audio/x-dts");
#define DTS_CAPS (gst_static_caps_get (&dts_caps))
#define DTS_MIN_FRAMESIZE 96
#define DTS_MAX_FRAMESIZE 18725 /* 16384*16/14 */
static gboolean
dts_parse_frame_header (DataScanCtx * c, guint * frame_size,
guint * sample_rate, guint * channels, guint * depth, guint * endianness)
{
static const int sample_rates[16] = { 0, 8000, 16000, 32000, 0, 0, 11025,
22050, 44100, 0, 0, 12000, 24000, 48000, 96000, 192000
};
static const guint8 channels_table[16] = { 1, 2, 2, 2, 2, 3, 3, 4, 4, 5,
6, 6, 6, 7, 8, 8
};
guint16 hdr[8];
guint32 marker;
guint num_blocks, chans, lfe, i;
marker = GST_READ_UINT32_BE (c->data);
/* raw big endian or 14-bit big endian */
if (marker == 0x7FFE8001 || marker == 0x1FFFE800) {
*endianness = G_BIG_ENDIAN;
for (i = 0; i < G_N_ELEMENTS (hdr); ++i)
hdr[i] = GST_READ_UINT16_BE (c->data + (i * sizeof (guint16)));
} else
/* raw little endian or 14-bit little endian */
if (marker == 0xFE7F0180 || marker == 0xFF1F00E8) {
*endianness = G_LITTLE_ENDIAN;
for (i = 0; i < G_N_ELEMENTS (hdr); ++i)
hdr[i] = GST_READ_UINT16_LE (c->data + (i * sizeof (guint16)));
} else {
return FALSE;
}
GST_LOG ("dts sync marker 0x%08x at offset %u", marker, (guint) c->offset);
/* 14-bit mode */
if (marker == 0x1FFFE800 || marker == 0xFF1F00E8) {
if ((hdr[2] & 0xFFF0) != 0x07F0)
return FALSE;
/* discard top 2 bits (2 void), shift in 2 */
hdr[0] = (hdr[0] << 2) | ((hdr[1] >> 12) & 0x0003);
/* discard top 4 bits (2 void, 2 shifted into hdr[0]), shift in 4 etc. */
hdr[1] = (hdr[1] << 4) | ((hdr[2] >> 10) & 0x000F);
hdr[2] = (hdr[2] << 6) | ((hdr[3] >> 8) & 0x003F);
hdr[3] = (hdr[3] << 8) | ((hdr[4] >> 6) & 0x00FF);
hdr[4] = (hdr[4] << 10) | ((hdr[5] >> 4) & 0x03FF);
hdr[5] = (hdr[5] << 12) | ((hdr[6] >> 2) & 0x0FFF);
hdr[6] = (hdr[6] << 14) | ((hdr[7] >> 0) & 0x3FFF);
g_assert (hdr[0] == 0x7FFE && hdr[1] == 0x8001);
*depth = 14;
} else {
*depth = 16;
}
GST_LOG ("frame header: %04x%04x%04x%04x", hdr[2], hdr[3], hdr[4], hdr[5]);
num_blocks = (hdr[2] >> 2) & 0x7F;
*frame_size = (((hdr[2] & 0x03) << 12) | (hdr[3] >> 4)) + 1;
chans = ((hdr[3] & 0x0F) << 2) | (hdr[4] >> 14);
*sample_rate = sample_rates[(hdr[4] >> 10) & 0x0F];
lfe = (hdr[5] >> 9) & 0x03;
if (num_blocks < 5 || *frame_size < 96 || *sample_rate == 0)
return FALSE;
if (marker == 0x1FFFE800 || marker == 0xFF1F00E8)
*frame_size = (*frame_size * 16) / 14; /* FIXME: round up? */
if (chans < G_N_ELEMENTS (channels_table))
*channels = channels_table[chans] + ((lfe) ? 1 : 0);
else
*channels = 0;
return TRUE;
}
static void
dts_type_find (GstTypeFind * tf, gpointer unused)
{
DataScanCtx c = { 0, NULL, 0 };
/* Search for an dts frame; not necessarily right at the start, but give it
* a lower probability if not found right at the start. Check that the
* frame is followed by a second frame at the expected offset. */
while (c.offset <= DTS_MAX_FRAMESIZE) {
guint frame_size = 0, rate = 0, chans = 0, depth = 0, endianness = 0;
if (G_UNLIKELY (!data_scan_ctx_ensure_data (tf, &c, DTS_MIN_FRAMESIZE)))
return;
if (G_UNLIKELY (dts_parse_frame_header (&c, &frame_size, &rate, &chans,
&depth, &endianness))) {
GstTypeFindProbability prob;
DataScanCtx next_c;
prob = (c.offset == 0) ? GST_TYPE_FIND_LIKELY : GST_TYPE_FIND_POSSIBLE;
/* check for second frame sync */
next_c = c;
data_scan_ctx_advance (tf, &next_c, frame_size);
if (data_scan_ctx_ensure_data (tf, &next_c, 4)) {
GST_LOG ("frame size: %u 0x%04x", frame_size, frame_size);
GST_MEMDUMP ("second frame sync", next_c.data, 4);
if (GST_READ_UINT32_BE (c.data) == GST_READ_UINT32_BE (next_c.data))
prob = GST_TYPE_FIND_MAXIMUM;
}
if (chans > 0) {
gst_type_find_suggest_simple (tf, prob, "audio/x-dts",
"rate", G_TYPE_INT, rate, "channels", G_TYPE_INT, chans,
"depth", G_TYPE_INT, depth, "endianness", G_TYPE_INT, endianness,
"framed", G_TYPE_BOOLEAN, FALSE, NULL);
} else {
gst_type_find_suggest_simple (tf, prob, "audio/x-dts",
"rate", G_TYPE_INT, rate, "depth", G_TYPE_INT, depth,
"endianness", G_TYPE_INT, endianness,
"framed", G_TYPE_BOOLEAN, FALSE, NULL);
}
return;
}
data_scan_ctx_advance (tf, &c, 1);
}
}
/*** gsm ***/
/* can only be detected by using the extension, in which case we use the default
* GSM properties */
static GstStaticCaps gsm_caps =
GST_STATIC_CAPS ("audio/x-gsm, rate=8000, channels=1");
#define GSM_CAPS (gst_static_caps_get(&gsm_caps))
/*** wavpack ***/
static GstStaticCaps wavpack_caps =
GST_STATIC_CAPS ("audio/x-wavpack, framed = (boolean) false");
#define WAVPACK_CAPS (gst_static_caps_get(&wavpack_caps))
static GstStaticCaps wavpack_correction_caps =
GST_STATIC_CAPS ("audio/x-wavpack-correction, framed = (boolean) false");
#define WAVPACK_CORRECTION_CAPS (gst_static_caps_get(&wavpack_correction_caps))
static void
wavpack_type_find (GstTypeFind * tf, gpointer unused)
{
GstTypeFindProbability base_prob = GST_TYPE_FIND_POSSIBLE;
guint64 offset;
guint32 blocksize;
const guint8 *data;
guint count_wv, count_wvc;
data = gst_type_find_peek (tf, 0, 32);
if (!data)
return;
if (data[0] != 'w' || data[1] != 'v' || data[2] != 'p' || data[3] != 'k')
return;
/* Note: wavpack blocks can be fairly large (easily 60-110k), possibly
* larger than the max. limits imposed by certain typefinding elements
* like id3demux or apedemux, so typefinding is most likely only going to
* work in pull-mode */
blocksize = GST_READ_UINT32_LE (data + 4);
GST_LOG ("wavpack header, blocksize=0x%04x", blocksize);
count_wv = 0;
count_wvc = 0;
offset = 32;
while (offset < 8 + blocksize) {
guint32 sublen;
/* get chunk header */
GST_LOG ("peeking at chunk at offset 0x%04x", (guint) offset);
data = gst_type_find_peek (tf, offset, 4);
if (data == NULL)
break;
sublen = ((guint32) data[1]) << 1;
if (data[0] & 0x80) {
sublen |= (((guint32) data[2]) << 9) | (((guint32) data[3]) << 17);
sublen += 1 + 3; /* id + length */
} else {
sublen += 1 + 1; /* id + length */
}
if (offset + sublen > 8 + blocksize) {
GST_LOG ("chunk length too big (%u > %" G_GUINT64_FORMAT ")", sublen,
blocksize - offset);
break;
}
if ((data[0] & 0x20) == 0) {
switch (data[0] & 0x0f) {
case 0xa: /* ID_WV_BITSTREAM */
case 0xc: /* ID_WVX_BITSTREAM */
++count_wv;
break;
case 0xb: /* ID_WVC_BITSTREAM */
++count_wvc;
break;
default:
break;
}
if (count_wv >= 5 || count_wvc >= 5)
break;
}
offset += sublen;
}
/* check for second block header */
data = gst_type_find_peek (tf, 8 + blocksize, 4);
if (data != NULL && memcmp (data, "wvpk", 4) == 0) {
GST_DEBUG ("found second block sync");
base_prob = GST_TYPE_FIND_LIKELY;
}
GST_DEBUG ("wvc=%d, wv=%d", count_wvc, count_wv);
if (count_wvc > 0 && count_wvc > count_wv) {
gst_type_find_suggest (tf,
MIN (base_prob + 5 * count_wvc, GST_TYPE_FIND_NEARLY_CERTAIN),
WAVPACK_CORRECTION_CAPS);
} else if (count_wv > 0) {
gst_type_find_suggest (tf,
MIN (base_prob + 5 * count_wv, GST_TYPE_FIND_NEARLY_CERTAIN),
WAVPACK_CAPS);
}
}
/*** application/postscrip ***/
static GstStaticCaps postscript_caps =
GST_STATIC_CAPS ("application/postscript");
#define POSTSCRIPT_CAPS (gst_static_caps_get(&postscript_caps))
static void
postscript_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data = gst_type_find_peek (tf, 0, 3);
if (!data)
return;
if (data[0] == 0x04)
data++;
if (data[0] == '%' && data[1] == '!')
gst_type_find_suggest (tf, GST_TYPE_FIND_POSSIBLE, POSTSCRIPT_CAPS);
}
/*** image/svg+xml ***/
static GstStaticCaps svg_caps = GST_STATIC_CAPS ("image/svg+xml");
#define SVG_CAPS (gst_static_caps_get(&svg_caps))
static void
svg_type_find (GstTypeFind * tf, gpointer unused)
{
static const gchar svg_doctype[] = "!DOCTYPE svg";
static const gchar svg_tag[] = "<svg";
DataScanCtx c = { 0, NULL, 0 };
while (c.offset <= 1024) {
if (G_UNLIKELY (!data_scan_ctx_ensure_data (tf, &c, 12)))
break;
if (memcmp (svg_doctype, c.data, 12) == 0) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, SVG_CAPS);
return;
} else if (memcmp (svg_tag, c.data, 4) == 0) {
gst_type_find_suggest (tf, GST_TYPE_FIND_LIKELY, SVG_CAPS);
return;
}
data_scan_ctx_advance (tf, &c, 1);
}
}
/*** multipart/x-mixed-replace mimestream ***/
static GstStaticCaps multipart_caps =
GST_STATIC_CAPS ("multipart/x-mixed-replace");
#define MULTIPART_CAPS gst_static_caps_get(&multipart_caps)
/* multipart/x-mixed replace is:
* <maybe some whitespace>--<some ascii chars>[\r]\n
* <more ascii chars>[\r]\nContent-type:<more ascii>[\r]\n */
static void
multipart_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data;
const guint8 *x;
#define MULTIPART_MAX_BOUNDARY_OFFSET 16
data = gst_type_find_peek (tf, 0, MULTIPART_MAX_BOUNDARY_OFFSET);
if (!data)
return;
for (x = data;
x - data < MULTIPART_MAX_BOUNDARY_OFFSET - 2 && g_ascii_isspace (*x);
x++);
if (x[0] != '-' || x[1] != '-')
return;
/* Could be okay, peek what should be enough for a complete header */
#define MULTIPART_MAX_HEADER_SIZE 256
data = gst_type_find_peek (tf, 0, MULTIPART_MAX_HEADER_SIZE);
if (!data)
return;
for (x = data; x - data < MULTIPART_MAX_HEADER_SIZE - 14; x++) {
if (!isascii (*x)) {
return;
}
if (*x == '\n' &&
!g_ascii_strncasecmp ("content-type:", (gchar *) x + 1, 13)) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, MULTIPART_CAPS);
return;
}
}
}
/*** video/mpeg systemstream ***/
static GstStaticCaps mpeg_sys_caps = GST_STATIC_CAPS ("video/mpeg, "
"systemstream = (boolean) true, mpegversion = (int) [ 1, 2 ]");
#define MPEG_SYS_CAPS gst_static_caps_get(&mpeg_sys_caps)
#define IS_MPEG_HEADER(data) (G_UNLIKELY((((guint8 *)(data))[0] == 0x00) && \
(((guint8 *)(data))[1] == 0x00) && \
(((guint8 *)(data))[2] == 0x01)))
#define IS_MPEG_PACK_CODE(b) ((b) == 0xBA)
#define IS_MPEG_SYS_CODE(b) ((b) == 0xBB)
#define IS_MPEG_PACK_HEADER(data) (IS_MPEG_HEADER (data) && \
IS_MPEG_PACK_CODE (((guint8 *)(data))[3]))
#define IS_MPEG_PES_CODE(b) (((b) & 0xF0) == 0xE0 || ((b) & 0xF0) == 0xC0 || \
(b) >= 0xBD)
#define IS_MPEG_PES_HEADER(data) (IS_MPEG_HEADER (data) && \
IS_MPEG_PES_CODE (((guint8 *)(data))[3]))
#define MPEG2_MAX_PROBE_LENGTH (128 * 1024) /* 128kB should be 64 packs of the
* most common 2kB pack size. */
#define MPEG2_MIN_SYS_HEADERS 2
#define MPEG2_MAX_SYS_HEADERS 5
static gboolean
mpeg_sys_is_valid_pack (GstTypeFind * tf, const guint8 * data, guint len,
guint * pack_size)
{
/* Check the pack header @ offset for validity, assuming that the 4 byte header
* itself has already been checked. */
guint8 stuff_len;
if (len < 12)
return FALSE;
/* Check marker bits */
if ((data[4] & 0xC4) == 0x44) {
/* MPEG-2 PACK */
if (len < 14)
return FALSE;
if ((data[6] & 0x04) != 0x04 ||
(data[8] & 0x04) != 0x04 ||
(data[9] & 0x01) != 0x01 || (data[12] & 0x03) != 0x03)
return FALSE;
stuff_len = data[13] & 0x07;
/* Check the following header bytes, if we can */
if ((14 + stuff_len + 4) <= len) {
if (!IS_MPEG_HEADER (data + 14 + stuff_len))
return FALSE;
}
if (pack_size)
*pack_size = 14 + stuff_len;
return TRUE;
} else if ((data[4] & 0xF1) == 0x21) {
/* MPEG-1 PACK */
if ((data[6] & 0x01) != 0x01 ||
(data[8] & 0x01) != 0x01 ||
(data[9] & 0x80) != 0x80 || (data[11] & 0x01) != 0x01)
return FALSE;
/* Check the following header bytes, if we can */
if ((12 + 4) <= len) {
if (!IS_MPEG_HEADER (data + 12))
return FALSE;
}
if (pack_size)
*pack_size = 12;
return TRUE;
}
return FALSE;
}
static gboolean
mpeg_sys_is_valid_pes (GstTypeFind * tf, const guint8 * data, guint len,
guint * pack_size)
{
guint pes_packet_len;
/* Check the PES header at the given position, assuming the header code itself
* was already checked */
if (len < 6)
return FALSE;
/* For MPEG Program streams, unbounded PES is not allowed, so we must have a
* valid length present */
pes_packet_len = GST_READ_UINT16_BE (data + 4);
if (pes_packet_len == 0)
return FALSE;
/* Check the following header, if we can */
if (6 + pes_packet_len + 4 <= len) {
if (!IS_MPEG_HEADER (data + 6 + pes_packet_len))
return FALSE;
}
if (pack_size)
*pack_size = 6 + pes_packet_len;
return TRUE;
}
static gboolean
mpeg_sys_is_valid_sys (GstTypeFind * tf, const guint8 * data, guint len,
guint * pack_size)
{
guint sys_hdr_len;
/* Check the System header at the given position, assuming the header code itself
* was already checked */
if (len < 6)
return FALSE;
sys_hdr_len = GST_READ_UINT16_BE (data + 4);
if (sys_hdr_len < 6)
return FALSE;
/* Check the following header, if we can */
if (6 + sys_hdr_len + 4 <= len) {
if (!IS_MPEG_HEADER (data + 6 + sys_hdr_len))
return FALSE;
}
if (pack_size)
*pack_size = 6 + sys_hdr_len;
return TRUE;
}
/* calculation of possibility to identify random data as mpeg systemstream:
* bits that must match in header detection: 32 (or more)
* chance that random data is identifed: 1/2^32
* chance that MPEG2_MIN_PACK_HEADERS headers are identified:
* 1/2^(32*MPEG2_MIN_PACK_HEADERS)
* chance that this happens in MPEG2_MAX_PROBE_LENGTH bytes:
* 1-(1+1/2^(32*MPEG2_MIN_PACK_HEADERS)^MPEG2_MAX_PROBE_LENGTH)
* for current values:
* 1-(1+1/2^(32*4)^101024)
* = <some_number>
* Since we also check marker bits and pes packet lengths, this probability is a
* very coarse upper bound.
*/
static void
mpeg_sys_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data, *data0, *first_sync, *end;
gint mpegversion = 0;
guint pack_headers = 0;
guint pes_headers = 0;
guint pack_size;
guint since_last_sync = 0;
guint32 sync_word = 0xffffffff;
guint potential_headers = 0;
G_STMT_START {
gint len;
len = MPEG2_MAX_PROBE_LENGTH;
while (len >= 16) {
data = gst_type_find_peek (tf, 0, 5 + len);
if (data != NULL)
break;
len = len / 2;
}
if (!data)
return;
end = data + len;
}
G_STMT_END;
data0 = data;
first_sync = NULL;
while (data < end) {
sync_word <<= 8;
if (sync_word == 0x00000100) {
/* Found potential sync word */
if (first_sync == NULL)
first_sync = data - 3;
if (since_last_sync > 4) {
/* If more than 4 bytes since the last sync word, reset our counters,
* as we're only interested in counting contiguous packets */
pes_headers = pack_headers = 0;
}
pack_size = 0;
potential_headers++;
if (IS_MPEG_PACK_CODE (data[0])) {
if ((data[1] & 0xC0) == 0x40) {
/* MPEG-2 */
mpegversion = 2;
} else if ((data[1] & 0xF0) == 0x20) {
mpegversion = 1;
}
if (mpegversion != 0 &&
mpeg_sys_is_valid_pack (tf, data - 3, end - data + 3, &pack_size)) {
pack_headers++;
}
} else if (IS_MPEG_PES_CODE (data[0])) {
/* PES stream */
if (mpeg_sys_is_valid_pes (tf, data - 3, end - data + 3, &pack_size)) {
pes_headers++;
if (mpegversion == 0)
mpegversion = 2;
}
} else if (IS_MPEG_SYS_CODE (data[0])) {
if (mpeg_sys_is_valid_sys (tf, data - 3, end - data + 3, &pack_size)) {
pack_headers++;
}
}
/* If we found a packet with a known size, skip the bytes in it and loop
* around to check the next packet. */
if (pack_size != 0) {
data += pack_size - 3;
sync_word = 0xffffffff;
since_last_sync = 0;
continue;
}
}
sync_word |= data[0];
since_last_sync++;
data++;
/* If we have found MAX headers, and *some* were pes headers (pack headers
* are optional in an mpeg system stream) then return our high-probability
* result */
if (pes_headers > 0 && (pack_headers + pes_headers) > MPEG2_MAX_SYS_HEADERS)
goto suggest;
}
/* If we at least saw MIN headers, and *some* were pes headers (pack headers
* are optional in an mpeg system stream) then return a lower-probability
* result */
if (pes_headers > 0 && (pack_headers + pes_headers) > MPEG2_MIN_SYS_HEADERS)
goto suggest;
return;
suggest:
{
guint prob;
prob = GST_TYPE_FIND_POSSIBLE + (10 * (pack_headers + pes_headers));
prob = MIN (prob, GST_TYPE_FIND_MAXIMUM);
/* With the above test, we get into problems when we try to typefind
a MPEG stream from a small amount of data, which can happen when
we get data pushed from a HTTP source. We thus make a second test
to give higher probability if all the potential headers were either
pack or pes headers (ie, no potential header was unrecognized). */
if (potential_headers == pack_headers + pes_headers) {
GST_LOG ("Only %u headers, but all were recognized", potential_headers);
prob += 10;
prob = MIN (prob, GST_TYPE_FIND_MAXIMUM);
}
/* lower probability if the first packet wasn't right at the start */
if (data0 != first_sync && prob >= 10)
prob -= 10;
GST_LOG ("Suggesting MPEG %d system stream, %d packs, %d pes, prob %u%%\n",
mpegversion, pack_headers, pes_headers, prob);
gst_type_find_suggest_simple (tf, prob, "video/mpeg",
"systemstream", G_TYPE_BOOLEAN, TRUE,
"mpegversion", G_TYPE_INT, mpegversion, NULL);
}
};
/*** video/mpegts Transport Stream ***/
static GstStaticCaps mpegts_caps = GST_STATIC_CAPS ("video/mpegts, "
"systemstream = (boolean) true, packetsize = (int) [ 188, 208 ]");
#define MPEGTS_CAPS gst_static_caps_get(&mpegts_caps)
#define GST_MPEGTS_TYPEFIND_MIN_HEADERS 4
#define GST_MPEGTS_TYPEFIND_MAX_HEADERS 10
#define GST_MPEGTS_MAX_PACKET_SIZE 208
#define GST_MPEGTS_TYPEFIND_SYNC_SIZE \
(GST_MPEGTS_TYPEFIND_MIN_HEADERS * GST_MPEGTS_MAX_PACKET_SIZE)
#define GST_MPEGTS_TYPEFIND_MAX_SYNC \
(GST_MPEGTS_TYPEFIND_MAX_HEADERS * GST_MPEGTS_MAX_PACKET_SIZE)
#define GST_MPEGTS_TYPEFIND_SCAN_LENGTH \
(GST_MPEGTS_TYPEFIND_MAX_SYNC * 4)
#define MPEGTS_HDR_SIZE 4
/* Check for sync byte, error_indicator == 0 and packet has payload.
* Adaptation control field (data[3] & 0x30) may be zero for TS packets with
* null PIDs. Still, these streams are valid TS streams (for null packets,
* AFC is supposed to be 0x1, but the spec also says decoders should just
* discard any packets with AFC = 0x00) */
#define IS_MPEGTS_HEADER(data) (data[0] == 0x47 && \
(data[1] & 0x80) == 0x00 && \
((data[3] & 0x30) != 0x00 || \
((data[3] & 0x30) == 0x00 && (data[1] & 0x1f) == 0x1f && (data[2] & 0xff) == 0xff)))
/* Helper function to search ahead at intervals of packet_size for mpegts
* headers */
static gint
mpeg_ts_probe_headers (GstTypeFind * tf, guint64 offset, gint packet_size)
{
/* We always enter this function having found at least one header already */
gint found = 1;
const guint8 *data = NULL;
GST_LOG ("looking for mpeg-ts packets of size %u", packet_size);
while (found < GST_MPEGTS_TYPEFIND_MAX_HEADERS) {
offset += packet_size;
data = gst_type_find_peek (tf, offset, MPEGTS_HDR_SIZE);
if (data == NULL || !IS_MPEGTS_HEADER (data))
return found;
found++;
GST_LOG ("mpeg-ts sync #%2d at offset %" G_GUINT64_FORMAT, found, offset);
}
return found;
}
/* Try and detect at least 4 packets in at most 10 packets worth of
* data. Need to try several possible packet sizes */
static void
mpeg_ts_type_find (GstTypeFind * tf, gpointer unused)
{
/* TS packet sizes to test: normal, DVHS packet size and
* FEC with 16 or 20 byte codes packet size. */
const gint pack_sizes[] = { 188, 192, 204, 208 };
const guint8 *data = NULL;
guint size = 0;
guint64 skipped = 0;
while (skipped < GST_MPEGTS_TYPEFIND_SCAN_LENGTH) {
if (size < MPEGTS_HDR_SIZE) {
data = gst_type_find_peek (tf, skipped, GST_MPEGTS_TYPEFIND_SYNC_SIZE);
if (!data)
break;
size = GST_MPEGTS_TYPEFIND_SYNC_SIZE;
}
/* Have at least MPEGTS_HDR_SIZE bytes at this point */
if (IS_MPEGTS_HEADER (data)) {
gint p;
GST_LOG ("possible mpeg-ts sync at offset %" G_GUINT64_FORMAT, skipped);
for (p = 0; p < G_N_ELEMENTS (pack_sizes); p++) {
gint found;
/* Probe ahead at size pack_sizes[p] */
found = mpeg_ts_probe_headers (tf, skipped, pack_sizes[p]);
if (found >= GST_MPEGTS_TYPEFIND_MIN_HEADERS) {
gint probability;
/* found at least 4 headers. 10 headers = MAXIMUM probability.
* Arbitrarily, I assigned 10% probability for each header we
* found, 40% -> 100% */
probability = MIN (10 * found, GST_TYPE_FIND_MAXIMUM);
gst_type_find_suggest_simple (tf, probability, "video/mpegts",
"systemstream", G_TYPE_BOOLEAN, TRUE,
"packetsize", G_TYPE_INT, pack_sizes[p], NULL);
return;
}
}
}
data++;
skipped++;
size--;
}
}
#define GST_MPEGVID_TYPEFIND_TRY_PICTURES 6
#define GST_MPEGVID_TYPEFIND_TRY_SYNC (100 * 1024) /* 100 kB */
/* Scan ahead a maximum of max_extra_offset bytes until the next IS_MPEG_HEADER
* offset. After the call, offset will be after the 0x000001, i.e. at the 4th
* byte of the MPEG header. Returns TRUE if a header was found, FALSE if not.
*/
static gboolean
mpeg_find_next_header (GstTypeFind * tf, DataScanCtx * c,
guint64 max_extra_offset)
{
guint64 extra_offset;
for (extra_offset = 0; extra_offset <= max_extra_offset; ++extra_offset) {
if (!data_scan_ctx_ensure_data (tf, c, 4))
return FALSE;
if (IS_MPEG_HEADER (c->data)) {
data_scan_ctx_advance (tf, c, 3);
return TRUE;
}
data_scan_ctx_advance (tf, c, 1);
}
return FALSE;
}
/*** video/mpeg MPEG-4 elementary video stream ***/
static GstStaticCaps mpeg4_video_caps = GST_STATIC_CAPS ("video/mpeg, "
"systemstream=(boolean)false, mpegversion=4, parsed=(boolean)false");
#define MPEG4_VIDEO_CAPS gst_static_caps_get(&mpeg4_video_caps)
/*
* This typefind is based on the elementary video header defined in
* http://xhelmboyx.tripod.com/formats/mpeg-layout.txt
* In addition, it allows the visual object sequence header to be
* absent, and even the VOS header to be absent. In the latter case,
* a number of VOPs have to be present.
*/
static void
mpeg4_video_type_find (GstTypeFind * tf, gpointer unused)
{
DataScanCtx c = { 0, NULL, 0 };
gboolean seen_vios_at_0 = FALSE;
gboolean seen_vios = FALSE;
gboolean seen_vos = FALSE;
gboolean seen_vol = FALSE;
guint num_vop_headers = 0;
guint8 sc;
while (c.offset < GST_MPEGVID_TYPEFIND_TRY_SYNC) {
if (num_vop_headers >= GST_MPEGVID_TYPEFIND_TRY_PICTURES)
break;
if (!mpeg_find_next_header (tf, &c,
GST_MPEGVID_TYPEFIND_TRY_SYNC - c.offset))
break;
sc = c.data[0];
/* visual_object_sequence_start_code */
if (sc == 0xB0) {
if (seen_vios)
break; /* Terminate at second vios */
if (c.offset == 0)
seen_vios_at_0 = TRUE;
seen_vios = TRUE;
data_scan_ctx_advance (tf, &c, 2);
if (!mpeg_find_next_header (tf, &c, 0))
break;
sc = c.data[0];
/* Optional metadata */
if (sc == 0xB2)
if (!mpeg_find_next_header (tf, &c, 24))
break;
}
/* visual_object_start_code (consider it optional) */
if (sc == 0xB5) {
data_scan_ctx_advance (tf, &c, 2);
/* may contain ID marker and YUV clamping */
if (!mpeg_find_next_header (tf, &c, 7))
break;
sc = c.data[0];
}
/* video_object_start_code */
if (sc <= 0x1F) {
if (seen_vos)
break; /* Terminate at second vos */
seen_vos = TRUE;
data_scan_ctx_advance (tf, &c, 2);
continue;
}
/* video_object_layer_start_code */
if (sc >= 0x20 && sc <= 0x2F) {
seen_vol = TRUE;
data_scan_ctx_advance (tf, &c, 5);
continue;
}
/* video_object_plane_start_code */
if (sc == 0xB6) {
num_vop_headers++;
data_scan_ctx_advance (tf, &c, 2);
continue;
}
/* Unknown start code. */
}
if (num_vop_headers > 0 || seen_vol) {
GstTypeFindProbability probability = 0;
GST_LOG ("Found %d pictures, vios: %d, vos:%d, vol:%d", num_vop_headers,
seen_vios, seen_vos, seen_vol);
if (num_vop_headers >= GST_MPEGVID_TYPEFIND_TRY_PICTURES && seen_vios_at_0
&& seen_vos && seen_vol)
probability = GST_TYPE_FIND_MAXIMUM - 1;
else if (num_vop_headers >= GST_MPEGVID_TYPEFIND_TRY_PICTURES && seen_vios
&& seen_vos && seen_vol)
probability = GST_TYPE_FIND_NEARLY_CERTAIN - 1;
else if (seen_vios_at_0 && seen_vos && seen_vol)
probability = GST_TYPE_FIND_NEARLY_CERTAIN - 6;
else if (num_vop_headers >= GST_MPEGVID_TYPEFIND_TRY_PICTURES && seen_vos
&& seen_vol)
probability = GST_TYPE_FIND_NEARLY_CERTAIN - 6;
else if (num_vop_headers >= GST_MPEGVID_TYPEFIND_TRY_PICTURES && seen_vol)
probability = GST_TYPE_FIND_NEARLY_CERTAIN - 9;
else if (num_vop_headers >= GST_MPEGVID_TYPEFIND_TRY_PICTURES)
probability = GST_TYPE_FIND_LIKELY - 1;
else if (num_vop_headers > 2 && seen_vios && seen_vos && seen_vol)
probability = GST_TYPE_FIND_LIKELY - 9;
else if (seen_vios && seen_vos && seen_vol)
probability = GST_TYPE_FIND_LIKELY - 20;
else if (num_vop_headers > 0 && seen_vos && seen_vol)
probability = GST_TYPE_FIND_POSSIBLE;
else if (num_vop_headers > 0)
probability = GST_TYPE_FIND_POSSIBLE - 10;
else if (seen_vos && seen_vol)
probability = GST_TYPE_FIND_POSSIBLE - 20;
gst_type_find_suggest (tf, probability, MPEG4_VIDEO_CAPS);
}
}
/*** video/x-h263 H263 video stream ***/
static GstStaticCaps h263_video_caps =
GST_STATIC_CAPS ("video/x-h263, variant=(string)itu");
#define H263_VIDEO_CAPS gst_static_caps_get(&h263_video_caps)
#define H263_MAX_PROBE_LENGTH (128 * 1024)
static void
h263_video_type_find (GstTypeFind * tf, gpointer unused)
{
DataScanCtx c = { 0, NULL, 0 };
guint64 data = 0xffff; /* prevents false positive for first 2 bytes */
guint64 psc = 0;
guint8 ptype = 0;
guint format;
guint good = 0;
guint bad = 0;
guint pc_type, pb_mode;
while (c.offset < H263_MAX_PROBE_LENGTH) {
if (G_UNLIKELY (!data_scan_ctx_ensure_data (tf, &c, 4)))
break;
/* Find the picture start code */
data = (data << 8) + c.data[0];
psc = data & G_GUINT64_CONSTANT (0xfffffc0000);
if (psc == 0x800000) {
/* Found PSC */
/* PTYPE */
ptype = (data & 0x3fc) >> 2;
/* Source Format */
format = ptype & 0x07;
/* Now that we have a Valid PSC, check if we also have a valid PTYPE and
the Source Format, which should range between 1 and 5 */
if (((ptype >> 6) == 0x2) && (format > 0 && format < 6)) {
pc_type = data & 0x02;
pb_mode = c.data[1] & 0x20 >> 4;
if (!pc_type && pb_mode)
bad++;
else
good++;
} else
bad++;
/* FIXME: maybe bail out early if we get mostly bad syncs ? */
}
data_scan_ctx_advance (tf, &c, 1);
}
GST_LOG ("good: %d, bad: %d", good, bad);
if (good > 2 * bad)
gst_type_find_suggest (tf, GST_TYPE_FIND_POSSIBLE, H263_VIDEO_CAPS);
return;
}
/*** video/x-h264 H264 elementary video stream ***/
static GstStaticCaps h264_video_caps =
GST_STATIC_CAPS ("video/x-h264,stream-format=byte-stream");
#define H264_VIDEO_CAPS gst_static_caps_get(&h264_video_caps)
#define H264_MAX_PROBE_LENGTH (128 * 1024) /* 128kB for HD should be enough. */
static void
h264_video_type_find (GstTypeFind * tf, gpointer unused)
{
DataScanCtx c = { 0, NULL, 0 };
/* Stream consists of: a series of sync codes (00 00 00 01) followed
* by NALs
*/
gboolean seen_idr = FALSE;
gboolean seen_sps = FALSE;
gboolean seen_pps = FALSE;
gboolean seen_ssps = FALSE;
int nut, ref;
int good = 0;
int bad = 0;
while (c.offset < H264_MAX_PROBE_LENGTH) {
if (G_UNLIKELY (!data_scan_ctx_ensure_data (tf, &c, 4)))
break;
if (IS_MPEG_HEADER (c.data)) {
nut = c.data[3] & 0x9f; /* forbiden_zero_bit | nal_unit_type */
ref = c.data[3] & 0x60; /* nal_ref_idc */
/* if forbidden bit is different to 0 won't be h264 */
if (nut > 0x1f) {
bad++;
break;
}
/* collect statistics about the NAL types */
if ((nut >= 1 && nut <= 13) || nut == 19) {
if ((nut == 5 && ref == 0) ||
((nut == 6 || (nut >= 9 && nut <= 12)) && ref != 0)) {
bad++;
} else {
if (nut == 7)
seen_sps = TRUE;
else if (nut == 8)
seen_pps = TRUE;
else if (nut == 5)
seen_idr = TRUE;
good++;
}
} else if (nut >= 14 && nut <= 33) {
if (nut == 15) {
seen_ssps = TRUE;
good++;
} else if (nut == 14 || nut == 20) {
/* Sometimes we see NAL 14 or 20 without SSPS
* if dropped into the middle of a stream -
* just ignore those (don't add to bad count) */
if (seen_ssps)
good++;
} else {
/* reserved */
/* Theoretically these are good, since if they exist in the
stream it merely means that a newer backwards-compatible
h.264 stream. But we should be identifying that separately. */
bad++;
}
} else {
/* unspecified, application specific */
/* don't consider these bad */
}
GST_LOG ("good:%d, bad:%d, pps:%d, sps:%d, idr:%d ssps:%d", good, bad,
seen_pps, seen_sps, seen_idr, seen_ssps);
if (seen_sps && seen_pps && seen_idr && good >= 10 && bad < 4) {
gst_type_find_suggest (tf, GST_TYPE_FIND_LIKELY, H264_VIDEO_CAPS);
return;
}
data_scan_ctx_advance (tf, &c, 4);
}
data_scan_ctx_advance (tf, &c, 1);
}
GST_LOG ("good:%d, bad:%d, pps:%d, sps:%d, idr:%d ssps=%d", good, bad,
seen_pps, seen_sps, seen_idr, seen_ssps);
if (good >= 2 && bad == 0) {
gst_type_find_suggest (tf, GST_TYPE_FIND_POSSIBLE, H264_VIDEO_CAPS);
}
}
/*** video/x-h265 H265 elementary video stream ***/
static GstStaticCaps h265_video_caps =
GST_STATIC_CAPS ("video/x-h265,stream-format=byte-stream");
#define H265_VIDEO_CAPS gst_static_caps_get(&h265_video_caps)
#define H265_MAX_PROBE_LENGTH (128 * 1024) /* 128kB for HD should be enough. */
static void
h265_video_type_find (GstTypeFind * tf, gpointer unused)
{
DataScanCtx c = { 0, NULL, 0 };
/* Stream consists of: a series of sync codes (00 00 00 01) followed
* by NALs
*/
gboolean seen_irap = FALSE;
gboolean seen_vps = FALSE;
gboolean seen_sps = FALSE;
gboolean seen_pps = FALSE;
int nut;
int good = 0;
int bad = 0;
while (c.offset < H265_MAX_PROBE_LENGTH) {
if (G_UNLIKELY (!data_scan_ctx_ensure_data (tf, &c, 5)))
break;
if (IS_MPEG_HEADER (c.data)) {
/* forbiden_zero_bit | nal_unit_type */
nut = c.data[3] & 0xfe;
/* if forbidden bit is different to 0 won't be h265 */
if (nut > 0x7e) {
bad++;
break;
}
nut = nut >> 1;
/* if nuh_layer_id is not zero or nuh_temporal_id_plus1 is zero then
* it won't be h265 */
if ((c.data[3] & 0x01) || (c.data[4] & 0xf8) || !(c.data[4] & 0x07)) {
bad++;
break;
}
/* collect statistics about the NAL types */
if ((nut >= 0 && nut <= 9) || (nut >= 16 && nut <= 21) || (nut >= 32
&& nut <= 40)) {
if (nut == 32)
seen_vps = TRUE;
else if (nut == 33)
seen_sps = TRUE;
else if (nut == 34)
seen_pps = TRUE;
else if (nut >= 16 && nut <= 21) {
/* BLA, IDR and CRA pictures are belongs to be IRAP picture */
/* we are not counting the reserved IRAP pictures (22 and 23) to good */
seen_irap = TRUE;
}
good++;
} else if ((nut >= 10 && nut <= 15) || (nut >= 22 && nut <= 31)
|| (nut >= 41 && nut <= 47)) {
/* reserved values are counting as bad */
bad++;
} else {
/* unspecified (48..63), application specific */
/* don't consider these as bad */
}
GST_LOG ("good:%d, bad:%d, pps:%d, sps:%d, vps:%d, irap:%d", good, bad,
seen_pps, seen_sps, seen_vps, seen_irap);
if (seen_sps && seen_pps && seen_irap && good >= 10 && bad < 4) {
gst_type_find_suggest (tf, GST_TYPE_FIND_LIKELY, H265_VIDEO_CAPS);
return;
}
data_scan_ctx_advance (tf, &c, 5);
}
data_scan_ctx_advance (tf, &c, 1);
}
GST_LOG ("good:%d, bad:%d, pps:%d, sps:%d, vps:%d, irap:%d", good, bad,
seen_pps, seen_sps, seen_vps, seen_irap);
if (good >= 2 && bad == 0) {
gst_type_find_suggest (tf, GST_TYPE_FIND_POSSIBLE, H265_VIDEO_CAPS);
}
}
/*** video/mpeg video stream ***/
static GstStaticCaps mpeg_video_caps = GST_STATIC_CAPS ("video/mpeg, "
"systemstream = (boolean) false");
#define MPEG_VIDEO_CAPS gst_static_caps_get(&mpeg_video_caps)
/*
* Idea is the same as MPEG system stream typefinding: We check each
* byte of the stream to see if - from that point on - the stream
* matches a predefined set of marker bits as defined in the MPEG
* video specs.
*
* I'm sure someone will do a chance calculation here too.
*/
static void
mpeg_video_stream_type_find (GstTypeFind * tf, gpointer unused)
{
DataScanCtx c = { 0, NULL, 0 };
gboolean seen_seq_at_0 = FALSE;
gboolean seen_seq = FALSE;
gboolean seen_gop = FALSE;
guint64 last_pic_offset = 0;
guint num_pic_headers = 0;
gint found = 0;
while (c.offset < GST_MPEGVID_TYPEFIND_TRY_SYNC) {
if (found >= GST_MPEGVID_TYPEFIND_TRY_PICTURES)
break;
if (!data_scan_ctx_ensure_data (tf, &c, 5))
break;
if (!IS_MPEG_HEADER (c.data))
goto next;
/* a pack header indicates that this isn't an elementary stream */
if (c.data[3] == 0xBA && mpeg_sys_is_valid_pack (tf, c.data, c.size, NULL))
return;
/* do we have a sequence header? */
if (c.data[3] == 0xB3) {
seen_seq_at_0 = seen_seq_at_0 || (c.offset == 0);
seen_seq = TRUE;
data_scan_ctx_advance (tf, &c, 4 + 8);
continue;
}
/* or a GOP header */
if (c.data[3] == 0xB8) {
seen_gop = TRUE;
data_scan_ctx_advance (tf, &c, 8);
continue;
}
/* but what we'd really like to see is a picture header */
if (c.data[3] == 0x00) {
++num_pic_headers;
last_pic_offset = c.offset;
data_scan_ctx_advance (tf, &c, 8);
continue;
}
/* ... each followed by a slice header with slice_vertical_pos=1 that's
* not too far away from the previously seen picture header. */
if (c.data[3] == 0x01 && num_pic_headers > found &&
(c.offset - last_pic_offset) >= 4 &&
(c.offset - last_pic_offset) <= 64) {
data_scan_ctx_advance (tf, &c, 4);
found += 1;
continue;
}
next:
data_scan_ctx_advance (tf, &c, 1);
}
if (found > 0 || seen_seq) {
GstTypeFindProbability probability = 0;
GST_LOG ("Found %d pictures, seq:%d, gop:%d", found, seen_seq, seen_gop);
if (found >= GST_MPEGVID_TYPEFIND_TRY_PICTURES && seen_seq && seen_gop)
probability = GST_TYPE_FIND_NEARLY_CERTAIN - 1;
else if (found >= GST_MPEGVID_TYPEFIND_TRY_PICTURES && seen_seq)
probability = GST_TYPE_FIND_NEARLY_CERTAIN - 9;
else if (found >= GST_MPEGVID_TYPEFIND_TRY_PICTURES)
probability = GST_TYPE_FIND_LIKELY;
else if (seen_seq_at_0 && seen_gop && found > 2)
probability = GST_TYPE_FIND_LIKELY - 10;
else if (seen_seq && seen_gop && found > 2)
probability = GST_TYPE_FIND_LIKELY - 20;
else if (seen_seq_at_0 && found > 0)
probability = GST_TYPE_FIND_POSSIBLE;
else if (seen_seq && found > 0)
probability = GST_TYPE_FIND_POSSIBLE - 5;
else if (found > 0)
probability = GST_TYPE_FIND_POSSIBLE - 10;
else if (seen_seq)
probability = GST_TYPE_FIND_POSSIBLE - 20;
gst_type_find_suggest_simple (tf, probability, "video/mpeg",
"systemstream", G_TYPE_BOOLEAN, FALSE,
"mpegversion", G_TYPE_INT, 1, "parsed", G_TYPE_BOOLEAN, FALSE, NULL);
}
}
/*** audio/x-aiff ***/
static GstStaticCaps aiff_caps = GST_STATIC_CAPS ("audio/x-aiff");
#define AIFF_CAPS gst_static_caps_get(&aiff_caps)
static void
aiff_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data = gst_type_find_peek (tf, 0, 4);
if (data && memcmp (data, "FORM", 4) == 0) {
data += 8;
if (memcmp (data, "AIFF", 4) == 0 || memcmp (data, "AIFC", 4) == 0)
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, AIFF_CAPS);
}
}
/*** audio/x-svx ***/
static GstStaticCaps svx_caps = GST_STATIC_CAPS ("audio/x-svx");
#define SVX_CAPS gst_static_caps_get(&svx_caps)
static void
svx_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data = gst_type_find_peek (tf, 0, 4);
if (data && memcmp (data, "FORM", 4) == 0) {
data += 8;
if (memcmp (data, "8SVX", 4) == 0 || memcmp (data, "16SV", 4) == 0)
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, SVX_CAPS);
}
}
/*** audio/x-shorten ***/
static GstStaticCaps shn_caps = GST_STATIC_CAPS ("audio/x-shorten");
#define SHN_CAPS gst_static_caps_get(&shn_caps)
static void
shn_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data = gst_type_find_peek (tf, 0, 4);
if (data && memcmp (data, "ajkg", 4) == 0) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, SHN_CAPS);
}
data = gst_type_find_peek (tf, -8, 8);
if (data && memcmp (data, "SHNAMPSK", 8) == 0) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, SHN_CAPS);
}
}
/*** application/x-ape ***/
static GstStaticCaps ape_caps = GST_STATIC_CAPS ("application/x-ape");
#define APE_CAPS gst_static_caps_get(&ape_caps)
static void
ape_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data = gst_type_find_peek (tf, 0, 4);
if (data && memcmp (data, "MAC ", 4) == 0) {
gst_type_find_suggest (tf, GST_TYPE_FIND_LIKELY + 10, APE_CAPS);
}
}
/*** ISO FORMATS ***/
/*** audio/x-m4a ***/
static GstStaticCaps m4a_caps = GST_STATIC_CAPS ("audio/x-m4a");
#define M4A_CAPS (gst_static_caps_get(&m4a_caps))
static void
m4a_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data = gst_type_find_peek (tf, 4, 8);
if (data && (memcmp (data, "ftypM4A ", 8) == 0)) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, M4A_CAPS);
}
}
/*** application/x-3gp ***/
/* The Q is there because variables can't start with a number. */
static GstStaticCaps q3gp_caps = GST_STATIC_CAPS ("application/x-3gp");
#define Q3GP_CAPS (gst_static_caps_get(&q3gp_caps))
static const gchar *
q3gp_type_find_get_profile (const guint8 * data)
{
switch (GST_MAKE_FOURCC (data[0], data[1], data[2], 0)) {
case GST_MAKE_FOURCC ('3', 'g', 'g', 0):
return "general";
case GST_MAKE_FOURCC ('3', 'g', 'p', 0):
return "basic";
case GST_MAKE_FOURCC ('3', 'g', 's', 0):
return "streaming-server";
case GST_MAKE_FOURCC ('3', 'g', 'r', 0):
return "progressive-download";
default:
break;
}
return NULL;
}
static void
q3gp_type_find (GstTypeFind * tf, gpointer unused)
{
const gchar *profile;
guint32 ftyp_size = 0;
gint offset = 0;
const guint8 *data = NULL;
if ((data = gst_type_find_peek (tf, 0, 12)) == NULL) {
return;
}
data += 4;
if (memcmp (data, "ftyp", 4) != 0) {
return;
}
/* check major brand */
data += 4;
if ((profile = q3gp_type_find_get_profile (data))) {
gst_type_find_suggest_simple (tf, GST_TYPE_FIND_MAXIMUM,
"application/x-3gp", "profile", G_TYPE_STRING, profile, NULL);
return;
}
/* check compatible brands */
if ((data = gst_type_find_peek (tf, 0, 4)) != NULL) {
ftyp_size = GST_READ_UINT32_BE (data);
}
for (offset = 16; offset < ftyp_size; offset += 4) {
if ((data = gst_type_find_peek (tf, offset, 3)) == NULL) {
break;
}
if ((profile = q3gp_type_find_get_profile (data))) {
gst_type_find_suggest_simple (tf, GST_TYPE_FIND_MAXIMUM,
"application/x-3gp", "profile", G_TYPE_STRING, profile, NULL);
return;
}
}
return;
}
/*** video/mj2 and image/jp2 ***/
static GstStaticCaps mj2_caps = GST_STATIC_CAPS ("video/mj2");
#define MJ2_CAPS gst_static_caps_get(&mj2_caps)
static GstStaticCaps jp2_caps = GST_STATIC_CAPS ("image/jp2");
#define JP2_CAPS gst_static_caps_get(&jp2_caps)
static void
jp2_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data;
data = gst_type_find_peek (tf, 0, 24);
if (!data)
return;
/* jp2 signature */
if (memcmp (data, "\000\000\000\014jP \015\012\207\012", 12) != 0)
return;
/* check ftyp box */
data += 12;
if (memcmp (data + 4, "ftyp", 4) == 0) {
if (memcmp (data + 8, "jp2 ", 4) == 0)
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, JP2_CAPS);
else if (memcmp (data + 8, "mjp2", 4) == 0)
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, MJ2_CAPS);
}
}
/*** video/quicktime ***/
static GstStaticCaps qt_caps = GST_STATIC_CAPS ("video/quicktime");
#define QT_CAPS gst_static_caps_get(&qt_caps)
#define STRNCMP(x,y,z) (strncmp ((char*)(x), (char*)(y), z))
/* FIXME 0.11: go through http://www.ftyps.com/ */
static void
qt_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data;
guint tip = 0;
guint64 offset = 0;
guint64 size;
const gchar *variant = NULL;
while ((data = gst_type_find_peek (tf, offset, 12)) != NULL) {
guint64 new_offset;
if (STRNCMP (&data[4], "ftypqt ", 8) == 0) {
tip = GST_TYPE_FIND_MAXIMUM;
break;
}
if (STRNCMP (&data[4], "ftypisom", 8) == 0 ||
STRNCMP (&data[4], "ftypavc1", 8) == 0 ||
STRNCMP (&data[4], "ftypmp42", 8) == 0) {
tip = GST_TYPE_FIND_MAXIMUM;
variant = "iso";
break;
}
if (STRNCMP (&data[4], "ftypisml", 8) == 0 ||
STRNCMP (&data[4], "ftypavc3", 8) == 0) {
tip = GST_TYPE_FIND_MAXIMUM;
variant = "iso-fragmented";
break;
}
if (STRNCMP (&data[4], "ftypccff", 8) == 0) {
tip = GST_TYPE_FIND_MAXIMUM;
variant = "ccff";
break;
}
/* box/atom types that are in common with ISO base media file format */
if (STRNCMP (&data[4], "moov", 4) == 0 ||
STRNCMP (&data[4], "mdat", 4) == 0 ||
STRNCMP (&data[4], "ftyp", 4) == 0 ||
STRNCMP (&data[4], "free", 4) == 0 ||
STRNCMP (&data[4], "uuid", 4) == 0 ||
STRNCMP (&data[4], "moof", 4) == 0 ||
STRNCMP (&data[4], "skip", 4) == 0) {
if (tip == 0) {
tip = GST_TYPE_FIND_LIKELY;
} else {
tip = GST_TYPE_FIND_NEARLY_CERTAIN;
}
}
/* other box/atom types, apparently quicktime specific */
else if (STRNCMP (&data[4], "pnot", 4) == 0 ||
STRNCMP (&data[4], "PICT", 4) == 0 ||
STRNCMP (&data[4], "wide", 4) == 0 ||
STRNCMP (&data[4], "prfl", 4) == 0) {
tip = GST_TYPE_FIND_MAXIMUM;
break;
} else {
tip = 0;
break;
}
size = GST_READ_UINT32_BE (data);
/* check compatible brands rather than ever expaning major brands above */
if ((STRNCMP (&data[4], "ftyp", 4) == 0) && (size >= 16)) {
new_offset = offset + 12;
while (new_offset + 4 <= offset + size) {
data = gst_type_find_peek (tf, new_offset, 4);
if (data == NULL)
goto done;
if (STRNCMP (&data[4], "isom", 4) == 0 ||
STRNCMP (&data[4], "dash", 4) == 0 ||
STRNCMP (&data[4], "avc1", 4) == 0 ||
STRNCMP (&data[4], "avc3", 4) == 0 ||
STRNCMP (&data[4], "mp41", 4) == 0 ||
STRNCMP (&data[4], "mp42", 4) == 0) {
tip = GST_TYPE_FIND_MAXIMUM;
variant = "iso";
goto done;
}
new_offset += 4;
}
}
if (size == 1) {
const guint8 *sizedata;
sizedata = gst_type_find_peek (tf, offset + 8, 8);
if (sizedata == NULL)
break;
size = GST_READ_UINT64_BE (sizedata);
} else {
if (size < 8)
break;
}
new_offset = offset + size;
if (new_offset <= offset)
break;
offset = new_offset;
}
done:
if (tip > 0) {
if (variant) {
GstCaps *caps = gst_caps_copy (QT_CAPS);
gst_caps_set_simple (caps, "variant", G_TYPE_STRING, variant, NULL);
gst_type_find_suggest (tf, tip, caps);
gst_caps_unref (caps);
} else {
gst_type_find_suggest (tf, tip, QT_CAPS);
}
}
};
/*** image/x-quicktime ***/
static GstStaticCaps qtif_caps = GST_STATIC_CAPS ("image/x-quicktime");
#define QTIF_CAPS gst_static_caps_get(&qtif_caps)
/* how many atoms we check before we give up */
#define QTIF_MAXROUNDS 25
static void
qtif_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data;
gboolean found_idsc = FALSE;
gboolean found_idat = FALSE;
guint64 offset = 0;
guint rounds = 0;
while ((data = gst_type_find_peek (tf, offset, 8)) != NULL) {
guint64 size;
size = GST_READ_UINT32_BE (data);
if (size == 1) {
const guint8 *sizedata;
sizedata = gst_type_find_peek (tf, offset + 8, 8);
if (sizedata == NULL)
break;
size = GST_READ_UINT64_BE (sizedata);
}
if (size < 8)
break;
if (STRNCMP (data + 4, "idsc", 4) == 0)
found_idsc = TRUE;
if (STRNCMP (data + 4, "idat", 4) == 0)
found_idat = TRUE;
if (found_idsc && found_idat) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, QTIF_CAPS);
return;
}
offset += size;
if (++rounds > QTIF_MAXROUNDS)
break;
}
if (found_idsc || found_idat) {
gst_type_find_suggest (tf, GST_TYPE_FIND_LIKELY, QTIF_CAPS);
return;
}
};
/*** audio/x-mod ***/
static GstStaticCaps mod_caps = GST_STATIC_CAPS ("audio/x-mod");
#define MOD_CAPS gst_static_caps_get(&mod_caps)
/* FIXME: M15 CheckType to do */
static void
mod_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data;
GstTypeFindProbability probability;
const char *mod_type = NULL;
/* MOD */
if ((data = gst_type_find_peek (tf, 1080, 4)) != NULL) {
/* Protracker and variants */
if ((memcmp (data, "M.K.", 4) == 0) ||
(memcmp (data, "M!K!", 4) == 0) ||
(memcmp (data, "M&K!", 4) == 0) || (memcmp (data, "N.T.", 4) == 0) ||
/* Star Tracker */
(memcmp (data, "FLT", 3) == 0 && isdigit (data[3])) ||
(memcmp (data, "EXO", 3) == 0 && isdigit (data[3])) ||
/* Oktalyzer (Amiga) */
(memcmp (data, "OKTA", 4) == 0) || (memcmp (data, "OCTA", 4) == 0) ||
/* Oktalyser (Atari) */
(memcmp (data, "CD81", 4) == 0) ||
/* Taketracker */
(memcmp (data, "TDZ", 3) == 0 && isdigit (data[3])) ||
/* Fasttracker */
(memcmp (data + 1, "CHN", 3) == 0 && isdigit (data[0])) ||
/* Fasttracker or Taketracker */
(memcmp (data + 2, "CH", 2) == 0 && isdigit (data[0])
&& isdigit (data[1])) || (memcmp (data + 2, "CN", 2) == 0
&& isdigit (data[0]) && isdigit (data[1]))) {
mod_type = "mod";
probability = GST_TYPE_FIND_MAXIMUM;
goto suggest_audio_mod_caps;
}
}
/* J2B (Jazz Jackrabbit 2) */
if ((data = gst_type_find_peek (tf, 0, 8)) != NULL) {
if ((memcmp (data, "MUSE\xDE\xAD", 4) == 0) &&
((memcmp (data + 6, "\xBE\xEF", 2) == 0) ||
(memcmp (data + 6, "\xBA\xBE", 2) == 0))) {
mod_type = "j2b";
probability = GST_TYPE_FIND_MAXIMUM;
goto suggest_audio_mod_caps;
}
}
/* AMS (Velvet Studio) */
if ((data = gst_type_find_peek (tf, 0, 7)) != NULL) {
if (memcmp (data, "AMShdr\x1A", 7) == 0) {
mod_type = "velvet-ams";
probability = GST_TYPE_FIND_MAXIMUM;
goto suggest_audio_mod_caps;
}
}
/* AMS (Extreme Tracker) */
if ((data = gst_type_find_peek (tf, 0, 9)) != NULL) {
if ((memcmp (data, "Extreme", 7) == 0) && (data[8] == 1)) {
mod_type = "extreme-ams";
probability = GST_TYPE_FIND_LIKELY;
goto suggest_audio_mod_caps;
}
}
/* ULT (Ultratracker) */
if ((data = gst_type_find_peek (tf, 0, 14)) != NULL) {
if (memcmp (data, "MAS_UTrack_V00", 14) == 0) {
mod_type = "ult";
probability = GST_TYPE_FIND_MAXIMUM;
goto suggest_audio_mod_caps;
}
}
/* DIGI (DigiBooster) */
if ((data = gst_type_find_peek (tf, 0, 20)) != NULL) {
if (memcmp (data, "DIGI Booster module\0", 20) == 0) {
mod_type = "digi";
probability = GST_TYPE_FIND_MAXIMUM;
goto suggest_audio_mod_caps;
}
}
/* PTM (PolyTracker) */
if ((data = gst_type_find_peek (tf, 0x2C, 4)) != NULL) {
if (memcmp (data, "PTMF", 4) == 0) {
mod_type = "ptm";
probability = GST_TYPE_FIND_LIKELY;
goto suggest_audio_mod_caps;
}
}
/* XM */
if ((data = gst_type_find_peek (tf, 0, 38)) != NULL) {
if ((memcmp (data, "Extended Module: ", 17) == 0) && (data[37] == 0x1A)) {
mod_type = "xm";
probability = GST_TYPE_FIND_MAXIMUM;
goto suggest_audio_mod_caps;
}
}
/* OKT */
if (data || (data = gst_type_find_peek (tf, 0, 8)) != NULL) {
if (memcmp (data, "OKTASONG", 8) == 0) {
mod_type = "okt";
probability = GST_TYPE_FIND_MAXIMUM;
goto suggest_audio_mod_caps;
}
}
/* Various formats with a 4-byte magic ID at the beginning of the file */
if (data || (data = gst_type_find_peek (tf, 0, 4)) != NULL) {
/* PSM (Protracker Studio PSM) */
if (memcmp (data, "PSM", 3) == 0) {
unsigned char fbyte = data[3];
if ((fbyte == ' ') || (fbyte == 254)) {
mod_type = "psm";
probability = GST_TYPE_FIND_MAXIMUM;
goto suggest_audio_mod_caps;
}
}
/* 669 */
if ((memcmp (data, "if", 2) == 0) || (memcmp (data, "JN", 2) == 0)) {
mod_type = "669";
probability = GST_TYPE_FIND_LIKELY;
goto suggest_audio_mod_caps;
}
/* AMF */
if ((memcmp (data, "AMF", 3) == 0) && (data[3] > 10) && (data[3] < 14)) {
mod_type = "dsmi-amf";
probability = GST_TYPE_FIND_MAXIMUM;
goto suggest_audio_mod_caps;
}
/* IT */
if (memcmp (data, "IMPM", 4) == 0) {
mod_type = "it";
probability = GST_TYPE_FIND_MAXIMUM;
goto suggest_audio_mod_caps;
}
/* DBM (DigiBooster Pro) */
if (memcmp (data, "DBM0", 4) == 0) {
mod_type = "dbm";
probability = GST_TYPE_FIND_MAXIMUM;
goto suggest_audio_mod_caps;
}
/* MDL (DigiTrakker) */
if (memcmp (data, "DMDL", 4) == 0) {
mod_type = "mdl";
probability = GST_TYPE_FIND_MAXIMUM;
goto suggest_audio_mod_caps;
}
/* MT2 (MadTracker 2.0) */
if (memcmp (data, "MT20", 4) == 0) {
mod_type = "mt2";
probability = GST_TYPE_FIND_MAXIMUM;
goto suggest_audio_mod_caps;
}
/* DMF (X-Tracker) */
if (memcmp (data, "DDMF", 4) == 0) {
mod_type = "dmf";
probability = GST_TYPE_FIND_MAXIMUM;
goto suggest_audio_mod_caps;
}
/* MED */
if ((memcmp (data, "MMD0", 4) == 0) || (memcmp (data, "MMD1", 4) == 0)) {
mod_type = "med";
probability = GST_TYPE_FIND_MAXIMUM;
goto suggest_audio_mod_caps;
}
/* MTM */
if (memcmp (data, "MTM", 3) == 0) {
mod_type = "mtm";
probability = GST_TYPE_FIND_MAXIMUM;
goto suggest_audio_mod_caps;
}
/* DSM */
if (memcmp (data, "RIFF", 4) == 0) {
const guint8 *data2 = gst_type_find_peek (tf, 8, 4);
if (data2) {
if (memcmp (data2, "DSMF", 4) == 0) {
mod_type = "dsm";
probability = GST_TYPE_FIND_MAXIMUM;
goto suggest_audio_mod_caps;
}
}
}
/* FAR (Farandole) */
if (memcmp (data, "FAR\xFE", 4) == 0) {
mod_type = "far";
probability = GST_TYPE_FIND_MAXIMUM;
goto suggest_audio_mod_caps;
}
/* FAM */
if (memcmp (data, "FAM\xFE", 4) == 0) {
const guint8 *data2 = gst_type_find_peek (tf, 44, 3);
if (data2) {
if (memcmp (data2, "compare", 3) == 0) {
mod_type = "fam";
probability = GST_TYPE_FIND_MAXIMUM;
goto suggest_audio_mod_caps;
}
/* otherwise do not suggest anything */
} else {
mod_type = "fam";
probability = GST_TYPE_FIND_LIKELY;
goto suggest_audio_mod_caps;
}
}
/* GDM */
if (memcmp (data, "GDM\xFE", 4) == 0) {
const guint8 *data2 = gst_type_find_peek (tf, 71, 4);
if (data2) {
if (memcmp (data2, "GMFS", 4) == 0) {
mod_type = "gdm";
probability = GST_TYPE_FIND_MAXIMUM;
goto suggest_audio_mod_caps;
}
/* otherwise do not suggest anything */
} else {
mod_type = "gdm";
probability = GST_TYPE_FIND_LIKELY;
goto suggest_audio_mod_caps;
}
}
/* UMX */
if (memcmp (data, "\xC1\x83\x2A\x9E", 4) == 0) {
mod_type = "umx";
probability = GST_TYPE_FIND_POSSIBLE;
goto suggest_audio_mod_caps;
}
}
/* FAR (Farandole) (secondary detection) */
if ((data = gst_type_find_peek (tf, 44, 3)) != NULL) {
if (memcmp (data, "\x0D\x0A\x1A", 3) == 0) {
mod_type = "far";
probability = GST_TYPE_FIND_POSSIBLE;
goto suggest_audio_mod_caps;
}
}
/* IMF */
if ((data = gst_type_find_peek (tf, 60, 4)) != NULL) {
if (memcmp (data, "IM10", 4) == 0) {
mod_type = "imf";
probability = GST_TYPE_FIND_MAXIMUM;
goto suggest_audio_mod_caps;
}
}
/* S3M */
if ((data = gst_type_find_peek (tf, 44, 4)) != NULL) {
if (memcmp (data, "SCRM", 4) == 0) {
mod_type = "s3m";
probability = GST_TYPE_FIND_MAXIMUM;
goto suggest_audio_mod_caps;
}
}
/* STM */
if ((data = gst_type_find_peek (tf, 20, 8)) != NULL) {
if (g_ascii_strncasecmp ((gchar *) data, "!Scream!", 8) == 0 ||
g_ascii_strncasecmp ((gchar *) data, "BMOD2STM", 8) == 0) {
const guint8 *id, *stmtype;
if ((id = gst_type_find_peek (tf, 28, 1)) == NULL)
return;
if ((stmtype = gst_type_find_peek (tf, 29, 1)) == NULL)
return;
if (*id == 0x1A && *stmtype == 2) {
mod_type = "stm";
probability = GST_TYPE_FIND_MAXIMUM;
goto suggest_audio_mod_caps;
}
}
}
/* AMF */
if ((data = gst_type_find_peek (tf, 0, 19)) != NULL) {
if (memcmp (data, "ASYLUM Music Format", 19) == 0) {
mod_type = "asylum-amf";
probability = GST_TYPE_FIND_MAXIMUM;
goto suggest_audio_mod_caps;
}
}
suggest_audio_mod_caps:
if (mod_type != NULL) {
GstCaps *caps = gst_caps_new_simple ("audio/x-mod",
"type", G_TYPE_STRING, mod_type, NULL);
gst_type_find_suggest (tf, probability, caps);
gst_caps_unref (caps);
}
}
/*** application/x-shockwave-flash ***/
static GstStaticCaps swf_caps =
GST_STATIC_CAPS ("application/x-shockwave-flash");
#define SWF_CAPS (gst_static_caps_get(&swf_caps))
static void
swf_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data = gst_type_find_peek (tf, 0, 4);
if (data && (data[0] == 'F' || data[0] == 'C') &&
data[1] == 'W' && data[2] == 'S') {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, SWF_CAPS);
}
}
/*** application/vnd.ms-sstr+xml ***/
static void
mss_manifest_load_utf16 (gunichar2 * utf16_ne, const guint8 * utf16_data,
gsize data_size, guint data_endianness)
{
memcpy (utf16_ne, utf16_data, data_size);
if (data_endianness != G_BYTE_ORDER) {
guint i;
for (i = 0; i < data_size / 2; ++i)
utf16_ne[i] = GUINT16_SWAP_LE_BE (utf16_ne[i]);
}
}
static GstStaticCaps mss_manifest_caps =
GST_STATIC_CAPS ("application/vnd.ms-sstr+xml");
#define MSS_MANIFEST_CAPS (gst_static_caps_get(&mss_manifest_caps))
static void
mss_manifest_type_find (GstTypeFind * tf, gpointer unused)
{
gunichar2 utf16_ne[512];
const guint8 *data;
guint data_endianness = 0;
glong n_read = 0, size = 0;
guint length;
gchar *utf8;
gboolean utf8_bom_detected = FALSE;
if (xml_check_first_element (tf, "SmoothStreamingMedia", 20, TRUE)) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, MSS_MANIFEST_CAPS);
return;
}
length = gst_type_find_get_length (tf);
/* try detecting the charset */
data = gst_type_find_peek (tf, 0, 3);
if (data == NULL)
return;
/* look for a possible BOM */
if (data[0] == 0xEF && data[1] == 0xBB && data[2] == 0xBF)
utf8_bom_detected = TRUE;
else if (data[0] == 0xFF && data[1] == 0xFE)
data_endianness = G_LITTLE_ENDIAN;
else if (data[0] == 0xFE && data[1] == 0xFF)
data_endianness = G_BIG_ENDIAN;
else
return;
/* try a default that should be enough */
if (length == 0)
length = 512;
else if (length < 64)
return;
else /* the first few bytes should be enough */
length = MIN (1024, length);
data = gst_type_find_peek (tf, 0, length);
if (data == NULL)
return;
/* skip the BOM */
data += 2;
length -= 2;
if (utf8_bom_detected) {
/* skip last byte of the BOM */
data++;
length--;
if (xml_check_first_element_from_data (data, length,
"SmoothStreamingMedia", 20, TRUE))
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, MSS_MANIFEST_CAPS);
} else {
length = GST_ROUND_DOWN_2 (length);
/* convert to native endian UTF-16 */
mss_manifest_load_utf16 (utf16_ne, data, length, data_endianness);
/* and now convert to UTF-8 */
utf8 = g_utf16_to_utf8 (utf16_ne, length / 2, &n_read, &size, NULL);
if (utf8 != NULL && n_read > 0) {
if (xml_check_first_element_from_data ((const guint8 *) utf8, size,
"SmoothStreamingMedia", 20, TRUE))
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, MSS_MANIFEST_CAPS);
}
g_free (utf8);
}
}
/*** image/jpeg ***/
#define JPEG_MARKER_IS_START_OF_FRAME(x) \
((x)>=0xc0 && (x) <= 0xcf && (x)!=0xc4 && (x)!=0xc8 && (x)!=0xcc)
static GstStaticCaps jpeg_caps = GST_STATIC_CAPS ("image/jpeg");
#define JPEG_CAPS (gst_static_caps_get(&jpeg_caps))
static void
jpeg_type_find (GstTypeFind * tf, gpointer unused)
{
GstTypeFindProbability prob = GST_TYPE_FIND_POSSIBLE;
DataScanCtx c = { 0, NULL, 0 };
GstCaps *caps;
guint num_markers;
if (G_UNLIKELY (!data_scan_ctx_ensure_data (tf, &c, 2)))
return;
if (c.data[0] != 0xff || c.data[1] != 0xd8)
return;
num_markers = 1;
data_scan_ctx_advance (tf, &c, 2);
caps = gst_caps_copy (JPEG_CAPS);
while (data_scan_ctx_ensure_data (tf, &c, 4) && c.offset < (200 * 1024)) {
guint16 len;
guint8 marker;
if (c.data[0] != 0xff)
break;
marker = c.data[1];
if (G_UNLIKELY (marker == 0xff)) {
data_scan_ctx_advance (tf, &c, 1);
continue;
}
data_scan_ctx_advance (tf, &c, 2);
/* we assume all markers we'll see before SOF have a payload length; if
* that's not the case we'll just detect a false sync and bail out, but
* still report POSSIBLE probability */
len = GST_READ_UINT16_BE (c.data);
GST_LOG ("possible JPEG marker 0x%02x (@0x%04x), segment length %u",
marker, (guint) c.offset, len);
if (!data_scan_ctx_ensure_data (tf, &c, len))
break;
if (marker == 0xc4 || /* DEFINE_HUFFMAN_TABLES */
marker == 0xcc || /* DEFINE_ARITHMETIC_CONDITIONING */
marker == 0xdb || /* DEFINE_QUANTIZATION_TABLES */
marker == 0xdd || /* DEFINE_RESTART_INTERVAL */
marker == 0xfe) { /* COMMENT */
data_scan_ctx_advance (tf, &c, len);
++num_markers;
} else if (marker == 0xe0 && len >= (2 + 4) && /* APP0 */
data_scan_ctx_memcmp (tf, &c, 2, "JFIF", 4)) {
GST_LOG ("found JFIF tag");
prob = GST_TYPE_FIND_MAXIMUM;
data_scan_ctx_advance (tf, &c, len);
++num_markers;
/* we continue until we find a start of frame marker */
} else if (marker == 0xe1 && len >= (2 + 4) && /* APP1 */
data_scan_ctx_memcmp (tf, &c, 2, "Exif", 4)) {
GST_LOG ("found Exif tag");
prob = GST_TYPE_FIND_MAXIMUM;
data_scan_ctx_advance (tf, &c, len);
++num_markers;
/* we continue until we find a start of frame marker */
} else if (marker >= 0xe0 && marker <= 0xef) { /* APPn */
data_scan_ctx_advance (tf, &c, len);
++num_markers;
} else if (JPEG_MARKER_IS_START_OF_FRAME (marker) && len >= (2 + 8)) {
int h, w;
h = GST_READ_UINT16_BE (c.data + 2 + 1);
w = GST_READ_UINT16_BE (c.data + 2 + 1 + 2);
if (h == 0 || w == 0) {
GST_WARNING ("bad width %u and/or height %u in SOF header", w, h);
break;
}
GST_LOG ("SOF at offset %" G_GUINT64_FORMAT ", num_markers=%d, "
"WxH=%dx%d", c.offset - 2, num_markers, w, h);
if (num_markers >= 5 || prob == GST_TYPE_FIND_MAXIMUM)
prob = GST_TYPE_FIND_MAXIMUM;
else
prob = GST_TYPE_FIND_LIKELY;
gst_caps_set_simple (caps, "width", G_TYPE_INT, w,
"height", G_TYPE_INT, h, "sof-marker", G_TYPE_INT, marker & 0xf,
NULL);
break;
} else {
GST_WARNING ("bad length or unexpected JPEG marker 0xff 0x%02x", marker);
break;
}
}
gst_type_find_suggest (tf, prob, caps);
gst_caps_unref (caps);
}
/*** image/bmp ***/
static GstStaticCaps bmp_caps = GST_STATIC_CAPS ("image/bmp");
#define BMP_CAPS (gst_static_caps_get(&bmp_caps))
static void
bmp_type_find (GstTypeFind * tf, gpointer unused)
{
DataScanCtx c = { 0, NULL, 0 };
guint32 struct_size, w, h, planes, bpp;
if (G_UNLIKELY (!data_scan_ctx_ensure_data (tf, &c, 54)))
return;
if (c.data[0] != 'B' || c.data[1] != 'M')
return;
/* skip marker + size */
data_scan_ctx_advance (tf, &c, 2 + 4);
/* reserved, must be 0 */
if (c.data[0] != 0 || c.data[1] != 0 || c.data[2] != 0 || c.data[3] != 0)
return;
data_scan_ctx_advance (tf, &c, 2 + 2);
/* offset to start of image data in bytes (check for sanity) */
GST_LOG ("offset=%u", GST_READ_UINT32_LE (c.data));
if (GST_READ_UINT32_LE (c.data) > (10 * 1024 * 1024))
return;
struct_size = GST_READ_UINT32_LE (c.data + 4);
GST_LOG ("struct_size=%u", struct_size);
data_scan_ctx_advance (tf, &c, 4 + 4);
if (struct_size == 0x0C) {
w = GST_READ_UINT16_LE (c.data);
h = GST_READ_UINT16_LE (c.data + 2);
planes = GST_READ_UINT16_LE (c.data + 2 + 2);
bpp = GST_READ_UINT16_LE (c.data + 2 + 2 + 2);
} else if (struct_size == 40 || struct_size == 64 || struct_size == 108
|| struct_size == 124 || struct_size == 0xF0) {
w = GST_READ_UINT32_LE (c.data);
h = GST_READ_UINT32_LE (c.data + 4);
planes = GST_READ_UINT16_LE (c.data + 4 + 4);
bpp = GST_READ_UINT16_LE (c.data + 4 + 4 + 2);
} else {
return;
}
/* image sizes sanity check */
GST_LOG ("w=%u, h=%u, planes=%u, bpp=%u", w, h, planes, bpp);
if (w == 0 || w > 0xfffff || h == 0 || h > 0xfffff || planes != 1 ||
(bpp != 1 && bpp != 4 && bpp != 8 && bpp != 16 && bpp != 24 && bpp != 32))
return;
gst_type_find_suggest_simple (tf, GST_TYPE_FIND_MAXIMUM, "image/bmp",
"width", G_TYPE_INT, w, "height", G_TYPE_INT, h, "bpp", G_TYPE_INT, bpp,
NULL);
}
/*** image/tiff ***/
static GstStaticCaps tiff_caps = GST_STATIC_CAPS ("image/tiff, "
"endianness = (int) { BIG_ENDIAN, LITTLE_ENDIAN }");
#define TIFF_CAPS (gst_static_caps_get(&tiff_caps))
static GstStaticCaps tiff_be_caps = GST_STATIC_CAPS ("image/tiff, "
"endianness = (int) BIG_ENDIAN");
#define TIFF_BE_CAPS (gst_static_caps_get(&tiff_be_caps))
static GstStaticCaps tiff_le_caps = GST_STATIC_CAPS ("image/tiff, "
"endianness = (int) LITTLE_ENDIAN");
#define TIFF_LE_CAPS (gst_static_caps_get(&tiff_le_caps))
static void
tiff_type_find (GstTypeFind * tf, gpointer ununsed)
{
const guint8 *data = gst_type_find_peek (tf, 0, 8);
guint8 le_header[4] = { 0x49, 0x49, 0x2A, 0x00 };
guint8 be_header[4] = { 0x4D, 0x4D, 0x00, 0x2A };
if (data) {
if (memcmp (data, le_header, 4) == 0) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, TIFF_LE_CAPS);
} else if (memcmp (data, be_header, 4) == 0) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, TIFF_BE_CAPS);
}
}
}
/*** image/x-exr ***/
static GstStaticCaps exr_caps = GST_STATIC_CAPS ("image/x-exr");
#define EXR_CAPS (gst_static_caps_get(&exr_caps))
static void
exr_type_find (GstTypeFind * tf, gpointer ununsed)
{
const guint8 *data = gst_type_find_peek (tf, 0, 8);
if (data) {
guint32 flags;
if (GST_READ_UINT32_LE (data) != 0x01312f76)
return;
flags = GST_READ_UINT32_LE (data + 4);
if ((flags & 0xff) != 1 && (flags & 0xff) != 2)
return;
/* If bit 9 is set, bit 11 and 12 must be 0 */
if ((flags & 0x200) && (flags & 0x1800))
return;
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, EXR_CAPS);
}
}
/*** PNM ***/
static GstStaticCaps pnm_caps = GST_STATIC_CAPS ("image/x-portable-bitmap; "
"image/x-portable-graymap; image/x-portable-pixmap; "
"image/x-portable-anymap");
#define PNM_CAPS (gst_static_caps_get(&pnm_caps))
#define IS_PNM_WHITESPACE(c) \
((c) == ' ' || (c) == '\r' || (c) == '\n' || (c) == 't')
static void
pnm_type_find (GstTypeFind * tf, gpointer ununsed)
{
const gchar *media_type = NULL;
DataScanCtx c = { 0, NULL, 0 };
guint h = 0, w = 0;
if (G_UNLIKELY (!data_scan_ctx_ensure_data (tf, &c, 16)))
return;
/* see http://en.wikipedia.org/wiki/Netpbm_format */
if (c.data[0] != 'P' || c.data[1] < '1' || c.data[1] > '7' ||
!IS_PNM_WHITESPACE (c.data[2]) ||
(c.data[3] != '#' && c.data[3] < '0' && c.data[3] > '9'))
return;
switch (c.data[1]) {
case '1':
media_type = "image/x-portable-bitmap"; /* ASCII */
break;
case '2':
media_type = "image/x-portable-graymap"; /* ASCII */
break;
case '3':
media_type = "image/x-portable-pixmap"; /* ASCII */
break;
case '4':
media_type = "image/x-portable-bitmap"; /* Raw */
break;
case '5':
media_type = "image/x-portable-graymap"; /* Raw */
break;
case '6':
media_type = "image/x-portable-pixmap"; /* Raw */
break;
case '7':
media_type = "image/x-portable-anymap";
break;
default:
g_return_if_reached ();
}
/* try to extract width and height as well */
if (c.data[1] != '7') {
gchar s[64] = { 0, }
, sep1, sep2;
/* need to skip any comment lines first */
data_scan_ctx_advance (tf, &c, 3);
while (c.data[0] == '#') { /* we know there's still data left */
data_scan_ctx_advance (tf, &c, 1);
while (c.data[0] != '\n' && c.data[0] != '\r') {
if (!data_scan_ctx_ensure_data (tf, &c, 4))
return;
data_scan_ctx_advance (tf, &c, 1);
}
data_scan_ctx_advance (tf, &c, 1);
GST_LOG ("skipped comment line in PNM header");
}
if (!data_scan_ctx_ensure_data (tf, &c, 32) &&
!data_scan_ctx_ensure_data (tf, &c, 4)) {
return;
}
/* need to NUL-terminate data for sscanf */
memcpy (s, c.data, MIN (sizeof (s) - 1, c.size));
if (sscanf (s, "%u%c%u%c", &w, &sep1, &h, &sep2) == 4 &&
IS_PNM_WHITESPACE (sep1) && IS_PNM_WHITESPACE (sep2) &&
w > 0 && w < G_MAXINT && h > 0 && h < G_MAXINT) {
GST_LOG ("extracted PNM width and height: %dx%d", w, h);
} else {
w = 0;
h = 0;
}
} else {
/* FIXME: extract width + height for anymaps too */
}
if (w > 0 && h > 0) {
gst_type_find_suggest_simple (tf, GST_TYPE_FIND_MAXIMUM, media_type,
"width", G_TYPE_INT, w, "height", G_TYPE_INT, h, NULL);
} else {
gst_type_find_suggest_simple (tf, GST_TYPE_FIND_LIKELY, media_type, NULL);
}
}
static GstStaticCaps sds_caps = GST_STATIC_CAPS ("audio/x-sds");
#define SDS_CAPS (gst_static_caps_get(&sds_caps))
static void
sds_type_find (GstTypeFind * tf, gpointer ununsed)
{
const guint8 *data = gst_type_find_peek (tf, 0, 4);
guint8 mask[4] = { 0xFF, 0xFF, 0x80, 0xFF };
guint8 match[4] = { 0xF0, 0x7E, 0, 0x01 };
gint x;
if (data) {
for (x = 0; x < 4; x++) {
if ((data[x] & mask[x]) != match[x]) {
return;
}
}
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, SDS_CAPS);
}
}
static GstStaticCaps ircam_caps = GST_STATIC_CAPS ("audio/x-ircam");
#define IRCAM_CAPS (gst_static_caps_get(&ircam_caps))
static void
ircam_type_find (GstTypeFind * tf, gpointer ununsed)
{
const guint8 *data = gst_type_find_peek (tf, 0, 4);
guint8 mask[4] = { 0xFF, 0xFF, 0xF8, 0xFF };
guint8 match[4] = { 0x64, 0xA3, 0x00, 0x00 };
gint x;
gboolean matched = TRUE;
if (!data) {
return;
}
for (x = 0; x < 4; x++) {
if ((data[x] & mask[x]) != match[x]) {
matched = FALSE;
}
}
if (matched) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, IRCAM_CAPS);
return;
}
/* now try the reverse version */
matched = TRUE;
for (x = 0; x < 4; x++) {
if ((data[x] & mask[3 - x]) != match[3 - x]) {
matched = FALSE;
}
}
}
/*** Matroska/WebM ***/
#define EBML_HEADER 0x1A45DFA3
#define EBML_VERSION 0x4286
#define EBML_DOCTYPE 0x4282
#define EBML_DOCTYPE_VERSION 0x4287
#define MATROSKA_SEGMENT 0x18538067
#define MATROSKA_CLUSTER 0x1F43B675
#define MATROSKA_TRACKS 0x1654AE6B
#define MATROSKA_TRACK_ENTRY 0xAE
#define MATROSKA_TRACK_TYPE 0x83
#define MATROSKA_STEREO_MODE 0x53B8
#define EBML_MAX_LEN (2 * 1024 * 1024)
typedef enum
{
EBML_DOCTYPE_UNKNOWN = 0,
EBML_DOCTYPE_MATROSKA,
EBML_DOCTYPE_WEBM
} GstEbmlDocType;
typedef struct
{
GstEbmlDocType doctype;
guint audio;
guint video;
guint other;
guint video_stereo;
guint chunks;
guint tracks_ok; /* if we've seen and fully parsed the TRACKS element */
} GstMatroskaInfo;
static inline guint
ebml_read_chunk_header (GstTypeFind * tf, DataScanCtx * c, guint max_size,
guint32 * id, guint64 * size)
{
guint64 mask;
guint msbit_set, i, len, id_len;
if (c->size < 12 || max_size < 1)
return 0;
/* element ID */
*id = c->data[0];
if ((c->data[0] & 0x80) == 0x80) {
id_len = 1;
} else if ((c->data[0] & 0xC0) == 0x40) {
id_len = 2;
} else if ((c->data[0] & 0xE0) == 0x20) {
id_len = 3;
} else if ((c->data[0] & 0xF0) == 0x10) {
id_len = 4;
} else {
return 0;
}
if (max_size < id_len)
return 0;
for (i = 1; i < id_len; ++i) {
*id = (*id << 8) | c->data[i];
}
data_scan_ctx_advance (tf, c, id_len);
max_size -= id_len;
/* size */
if (max_size < 1 || c->data[0] == 0)
return 0;
msbit_set = g_bit_nth_msf (c->data[0], 8);
mask = ((1 << msbit_set) - 1);
*size = c->data[0] & mask;
len = 7 - msbit_set;
if (max_size < 1 + len)
return 0;
for (i = 0; i < len; ++i) {
mask = (mask << 8) | 0xff;
*size = (*size << 8) | c->data[1 + i];
}
data_scan_ctx_advance (tf, c, 1 + len);
/* undefined/unknown size? (all bits 1) */
if (*size == mask) {
/* allow unknown size for SEGMENT chunk, bail out otherwise */
if (*id == MATROSKA_SEGMENT)
*size = G_MAXUINT64;
else
return 0;
}
return id_len + (1 + len);
}
static gboolean
ebml_parse_chunk (GstTypeFind * tf, DataScanCtx * ctx, guint32 chunk_id,
guint chunk_size, GstMatroskaInfo * info, guint depth)
{ /* FIXME: make sure input size is clipped to 32 bit */
static const gchar SPACES[] = " ";
DataScanCtx c = *ctx;
guint64 element_size;
guint32 id, hdr_len;
if (depth >= 8) /* keep SPACES large enough for depth */
return FALSE;
while (chunk_size > 0) {
if (c.offset > EBML_MAX_LEN || !data_scan_ctx_ensure_data (tf, &c, 64))
return FALSE;
hdr_len = ebml_read_chunk_header (tf, &c, chunk_size, &id, &element_size);
if (hdr_len == 0)
return FALSE;
g_assert (hdr_len <= chunk_size);
chunk_size -= hdr_len;
if (element_size > chunk_size)
return FALSE;
GST_DEBUG ("%s %08x, size %" G_GUINT64_FORMAT " / %" G_GUINT64_FORMAT,
SPACES + sizeof (SPACES) - 1 - (2 * depth), id, element_size,
hdr_len + element_size);
if (!data_scan_ctx_ensure_data (tf, &c, element_size)) {
GST_DEBUG ("not enough data");
return FALSE;
}
switch (id) {
case EBML_DOCTYPE:
if (element_size >= 8 && memcmp (c.data, "matroska", 8) == 0)
info->doctype = EBML_DOCTYPE_MATROSKA;
else if (element_size >= 4 && memcmp (c.data, "webm", 4) == 0)
info->doctype = EBML_DOCTYPE_WEBM;
break;
case MATROSKA_SEGMENT:
GST_LOG ("parsing segment");
ebml_parse_chunk (tf, &c, id, element_size, info, depth + 1);
GST_LOG ("parsed segment, done");
return FALSE;
case MATROSKA_TRACKS:
GST_LOG ("parsing tracks");
info->tracks_ok =
ebml_parse_chunk (tf, &c, id, element_size, info, depth + 1);
GST_LOG ("parsed tracks: %s, done (after %" G_GUINT64_FORMAT " bytes)",
info->tracks_ok ? "ok" : "FAIL", c.offset + element_size);
return FALSE;
case MATROSKA_TRACK_ENTRY:
GST_LOG ("parsing track entry");
if (!ebml_parse_chunk (tf, &c, id, element_size, info, depth + 1))
return FALSE;
break;
case MATROSKA_TRACK_TYPE:{
guint type = 0, i;
/* is supposed to always be 1-byte, but not everyone's following that */
for (i = 0; i < element_size; ++i)
type = (type << 8) | c.data[i];
GST_DEBUG ("%s track type %u",
SPACES + sizeof (SPACES) - 1 - (2 * depth), type);
if (type == 1)
++info->video;
else if (c.data[0] == 2)
++info->audio;
else
++info->other;
break;
}
case MATROSKA_STEREO_MODE:
++info->video_stereo;
break;
case MATROSKA_CLUSTER:
GST_WARNING ("cluster, bailing out (should've found tracks by now)");
return FALSE;
default:
break;
}
data_scan_ctx_advance (tf, &c, element_size);
chunk_size -= element_size;
++info->chunks;
}
return TRUE;
}
static GstStaticCaps matroska_caps = GST_STATIC_CAPS ("video/x-matroska");
#define MATROSKA_CAPS (gst_static_caps_get(&matroska_caps))
static void
matroska_type_find (GstTypeFind * tf, gpointer ununsed)
{
GstTypeFindProbability prob;
GstMatroskaInfo info = { 0, };
const gchar *type_name;
DataScanCtx c = { 0, NULL, 0 };
gboolean is_audio;
guint64 size;
guint32 id, hdr_len;
if (!data_scan_ctx_ensure_data (tf, &c, 64))
return;
if (GST_READ_UINT32_BE (c.data) != EBML_HEADER)
return;
while (c.offset < EBML_MAX_LEN && data_scan_ctx_ensure_data (tf, &c, 64)) {
hdr_len = ebml_read_chunk_header (tf, &c, c.size, &id, &size);
if (hdr_len == 0)
return;
GST_INFO ("=== top-level chunk %08x, size %" G_GUINT64_FORMAT
" / %" G_GUINT64_FORMAT, id, size, size + hdr_len);
if (!ebml_parse_chunk (tf, &c, id, size, &info, 0))
break;
data_scan_ctx_advance (tf, &c, size);
GST_INFO ("=== done with chunk %08x", id);
if (id == MATROSKA_SEGMENT)
break;
}
GST_INFO ("audio=%u video=%u other=%u chunks=%u doctype=%d all_tracks=%d",
info.audio, info.video, info.other, info.chunks, info.doctype,
info.tracks_ok);
/* perhaps we should bail out if tracks_ok is FALSE and wait for more data?
* (we would need new API to signal this properly and prevent other
* typefinders from taking over the decision then) */
is_audio = (info.audio > 0 && info.video == 0 && info.other == 0);
if (info.doctype == EBML_DOCTYPE_WEBM) {
type_name = (is_audio) ? "audio/webm" : "video/webm";
} else if (info.video > 0 && info.video_stereo) {
type_name = "video/x-matroska-3d";
} else {
type_name = (is_audio) ? "audio/x-matroska" : "video/x-matroska";
}
if (info.doctype == EBML_DOCTYPE_UNKNOWN)
prob = GST_TYPE_FIND_LIKELY;
else
prob = GST_TYPE_FIND_MAXIMUM;
gst_type_find_suggest_simple (tf, prob, type_name, NULL);
}
/*** application/mxf ***/
static GstStaticCaps mxf_caps = GST_STATIC_CAPS ("application/mxf");
#define MXF_MAX_PROBE_LENGTH (1024 * 64)
#define MXF_CAPS (gst_static_caps_get(&mxf_caps))
/*
* MXF files start with a header partition pack key of 16 bytes which is defined
* at SMPTE-377M 6.1. Before this there can be up to 64K of run-in which _must_
* not contain the partition pack key.
*/
static void
mxf_type_find (GstTypeFind * tf, gpointer ununsed)
{
static const guint8 partition_pack_key[] =
{ 0x06, 0x0e, 0x2b, 0x34, 0x02, 0x05, 0x01, 0x01, 0x0d, 0x01, 0x02, 0x01,
0x01
};
DataScanCtx c = { 0, NULL, 0 };
while (c.offset <= MXF_MAX_PROBE_LENGTH) {
guint i;
if (G_UNLIKELY (!data_scan_ctx_ensure_data (tf, &c, 1024)))
break;
/* look over in chunks of 1kbytes to avoid too much overhead */
for (i = 0; i < 1024 - 16; i++) {
/* Check first byte before calling more expensive memcmp function */
if (G_UNLIKELY (c.data[i] == 0x06
&& memcmp (c.data + i, partition_pack_key, 13) == 0)) {
/* Header partition pack? */
if (c.data[i + 13] != 0x02)
goto advance;
/* Partition status */
if (c.data[i + 14] >= 0x05)
goto advance;
/* Reserved, must be 0x00 */
if (c.data[i + 15] != 0x00)
goto advance;
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, MXF_CAPS);
return;
}
}
advance:
data_scan_ctx_advance (tf, &c, 1024 - 16);
}
}
/*** video/x-dv ***/
static GstStaticCaps dv_caps = GST_STATIC_CAPS ("video/x-dv, "
"systemstream = (boolean) true");
#define DV_CAPS (gst_static_caps_get(&dv_caps))
static void
dv_type_find (GstTypeFind * tf, gpointer private)
{
const guint8 *data;
data = gst_type_find_peek (tf, 0, 5);
/* check for DIF and DV flag */
if (data && (data[0] == 0x1f) && (data[1] == 0x07) && (data[2] == 0x00)) {
const gchar *format;
if (data[3] & 0x80) {
format = "PAL";
} else {
format = "NTSC";
}
gst_type_find_suggest_simple (tf, GST_TYPE_FIND_MAXIMUM, "video/x-dv",
"systemstream", G_TYPE_BOOLEAN, TRUE,
"format", G_TYPE_STRING, format, NULL);
}
}
/*** Ogg variants ***/
static GstStaticCaps ogg_caps =
GST_STATIC_CAPS ("application/ogg;video/ogg;audio/ogg;application/kate");
#define OGG_CAPS (gst_static_caps_get(&ogg_caps))
typedef enum
{
OGG_AUDIO = 0,
OGG_VIDEO,
OGG_KATE,
OGG_OTHER,
OGG_SKELETON,
OGG_ANNODEX,
OGG_NUM
} GstOggStreamType;
static void
ogganx_type_find (GstTypeFind * tf, gpointer private)
{
const gchar *media_type;
DataScanCtx c = { 0, NULL, 0 };
guint ogg_syncs = 0;
guint hdr_count[OGG_NUM] = { 0, };
static const struct
{
const gchar marker[10];
guint8 marker_size;
GstOggStreamType stream_type;
} markers[] = {
{
"\001vorbis", 7, OGG_AUDIO}, {
"\200theora", 7, OGG_VIDEO}, {
"fLaC", 4, OGG_AUDIO}, {
"\177FLAC", 5, OGG_AUDIO}, {
"Speex", 5, OGG_AUDIO}, {
"CMML\0\0\0\0", 8, OGG_OTHER}, {
"PCM ", 8, OGG_AUDIO}, {
"Annodex", 7, OGG_ANNODEX}, {
"fishead", 7, OGG_SKELETON}, {
"AnxData", 7, OGG_ANNODEX}, {
"CELT ", 8, OGG_AUDIO}, {
"\200kate\0\0\0", 8, OGG_KATE}, {
"BBCD\0", 5, OGG_VIDEO}, {
"OVP80\1\1", 7, OGG_VIDEO}, {
"OpusHead", 8, OGG_AUDIO}, {
"\001audio\0\0\0", 9, OGG_AUDIO}, {
"\001video\0\0\0", 9, OGG_VIDEO}, {
"\001text\0\0\0", 9, OGG_OTHER}
};
while (c.offset < 4096 && data_scan_ctx_ensure_data (tf, &c, 64)) {
guint size, i;
if (memcmp (c.data, "OggS", 5) != 0)
break;
++ogg_syncs;
/* check if BOS */
if (c.data[5] != 0x02)
break;
/* headers should only have one segment */
if (c.data[26] != 1)
break;
size = c.data[27];
if (size < 8)
break;
data_scan_ctx_advance (tf, &c, 28);
if (!data_scan_ctx_ensure_data (tf, &c, MAX (size, 8)))
break;
for (i = 0; i < G_N_ELEMENTS (markers); ++i) {
if (memcmp (c.data, markers[i].marker, markers[i].marker_size) == 0) {
++hdr_count[markers[i].stream_type];
break;
}
}
if (i == G_N_ELEMENTS (markers)) {
GST_MEMDUMP ("unknown Ogg stream marker", c.data, size);
++hdr_count[OGG_OTHER];
}
data_scan_ctx_advance (tf, &c, size);
}
if (ogg_syncs == 0)
return;
/* We don't bother with annodex types. FIXME: what about XSPF? */
if (hdr_count[OGG_VIDEO] > 0) {
media_type = "video/ogg";
} else if (hdr_count[OGG_AUDIO] > 0) {
media_type = "audio/ogg";
} else if (hdr_count[OGG_KATE] > 0 && hdr_count[OGG_OTHER] == 0) {
media_type = "application/kate";
} else {
media_type = "application/ogg";
}
GST_INFO ("found %s (audio:%u, video:%u, annodex:%u, skeleton:%u, other:%u)",
media_type, hdr_count[OGG_AUDIO], hdr_count[OGG_VIDEO],
hdr_count[OGG_ANNODEX], hdr_count[OGG_SKELETON], hdr_count[OGG_OTHER]);
gst_type_find_suggest_simple (tf, GST_TYPE_FIND_MAXIMUM, media_type, NULL);
}
/*** audio/x-vorbis ***/
static GstStaticCaps vorbis_caps = GST_STATIC_CAPS ("audio/x-vorbis");
#define VORBIS_CAPS (gst_static_caps_get(&vorbis_caps))
static void
vorbis_type_find (GstTypeFind * tf, gpointer private)
{
const guint8 *data = gst_type_find_peek (tf, 0, 30);
if (data) {
guint blocksize_0;
guint blocksize_1;
/* 1 byte packet type (identification=0x01)
6 byte string "vorbis"
4 byte vorbis version */
if (memcmp (data, "\001vorbis\000\000\000\000", 11) != 0)
return;
data += 11;
/* 1 byte channels must be != 0 */
if (data[0] == 0)
return;
data++;
/* 4 byte samplerate must be != 0 */
if (GST_READ_UINT32_LE (data) == 0)
return;
data += 16;
/* blocksize checks */
blocksize_0 = data[0] & 0x0F;
blocksize_1 = (data[0] & 0xF0) >> 4;
if (blocksize_0 > blocksize_1)
return;
if (blocksize_0 < 6 || blocksize_0 > 13)
return;
if (blocksize_1 < 6 || blocksize_1 > 13)
return;
data++;
/* framing bit */
if ((data[0] & 0x01) != 1)
return;
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, VORBIS_CAPS);
}
}
/*** video/x-theora ***/
static GstStaticCaps theora_caps = GST_STATIC_CAPS ("video/x-theora");
#define THEORA_CAPS (gst_static_caps_get(&theora_caps))
static void
theora_type_find (GstTypeFind * tf, gpointer private)
{
const guint8 *data = gst_type_find_peek (tf, 0, 7); //42);
if (data) {
if (data[0] != 0x80)
return;
if (memcmp (&data[1], "theora", 6) != 0)
return;
/* FIXME: make this more reliable when specs are out */
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, THEORA_CAPS);
}
}
/*** kate ***/
static void
kate_type_find (GstTypeFind * tf, gpointer private)
{
const guint8 *data = gst_type_find_peek (tf, 0, 64);
gchar category[16] = { 0, };
if (G_UNLIKELY (data == NULL))
return;
/* see: http://wiki.xiph.org/index.php/OggKate#Format_specification */
if (G_LIKELY (memcmp (data, "\200kate\0\0\0", 8) != 0))
return;
/* make sure we always have a NUL-terminated string */
memcpy (category, data + 48, 15);
GST_LOG ("kate category: %s", category);
/* canonical categories for subtitles: subtitles, spu-subtitles, SUB, K-SPU */
if (strcmp (category, "subtitles") == 0 || strcmp (category, "SUB") == 0 ||
strcmp (category, "spu-subtitles") == 0 ||
strcmp (category, "K-SPU") == 0) {
gst_type_find_suggest_simple (tf, GST_TYPE_FIND_MAXIMUM,
"subtitle/x-kate", NULL);
} else {
gst_type_find_suggest_simple (tf, GST_TYPE_FIND_MAXIMUM,
"application/x-kate", NULL);
}
}
/*** WEBVTTT subtitles ***/
static GstStaticCaps webvtt_caps =
GST_STATIC_CAPS ("application/x-subtitle-vtt, parsed=(boolean)false");
#define WEBVTT_CAPS (gst_static_caps_get(&webvtt_caps))
static void
webvtt_type_find (GstTypeFind * tf, gpointer private)
{
const guint8 *data;
data = gst_type_find_peek (tf, 0, 9);
if (data == NULL)
return;
/* there might be a UTF-8 BOM at the beginning */
if (memcmp (data, "WEBVTT", 6) != 0 && memcmp (data + 3, "WEBVTT", 6) != 0) {
return;
}
if (data[0] != 'W') {
if (data[0] != 0xef || data[1] != 0xbb || data[2] != 0xbf)
return; /* Not a UTF-8 BOM */
data += 3;
}
/* After the WEBVTT magic must be one of these chars:
* 0x20 (space), 0x9 (tab), 0xa (LF) or 0xd (CR) */
if (data[6] != 0x20 && data[6] != 0x9 && data[6] != 0xa && data[6] != 0xd) {
return;
}
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, WEBVTT_CAPS);
}
/*** application/x-ogm-video or audio***/
static GstStaticCaps ogmvideo_caps =
GST_STATIC_CAPS ("application/x-ogm-video");
#define OGMVIDEO_CAPS (gst_static_caps_get(&ogmvideo_caps))
static void
ogmvideo_type_find (GstTypeFind * tf, gpointer private)
{
const guint8 *data = gst_type_find_peek (tf, 0, 9);
if (data) {
if (memcmp (data, "\001video\000\000\000", 9) != 0)
return;
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, OGMVIDEO_CAPS);
}
}
static GstStaticCaps ogmaudio_caps =
GST_STATIC_CAPS ("application/x-ogm-audio");
#define OGMAUDIO_CAPS (gst_static_caps_get(&ogmaudio_caps))
static void
ogmaudio_type_find (GstTypeFind * tf, gpointer private)
{
const guint8 *data = gst_type_find_peek (tf, 0, 9);
if (data) {
if (memcmp (data, "\001audio\000\000\000", 9) != 0)
return;
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, OGMAUDIO_CAPS);
}
}
static GstStaticCaps ogmtext_caps = GST_STATIC_CAPS ("application/x-ogm-text");
#define OGMTEXT_CAPS (gst_static_caps_get(&ogmtext_caps))
static void
ogmtext_type_find (GstTypeFind * tf, gpointer private)
{
const guint8 *data = gst_type_find_peek (tf, 0, 9);
if (data) {
if (memcmp (data, "\001text\000\000\000\000", 9) != 0)
return;
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, OGMTEXT_CAPS);
}
}
/*** audio/x-speex ***/
static GstStaticCaps speex_caps = GST_STATIC_CAPS ("audio/x-speex");
#define SPEEX_CAPS (gst_static_caps_get(&speex_caps))
static void
speex_type_find (GstTypeFind * tf, gpointer private)
{
const guint8 *data = gst_type_find_peek (tf, 0, 80);
if (data) {
/* 8 byte string "Speex "
24 byte speex version string + int */
if (memcmp (data, "Speex ", 8) != 0)
return;
data += 32;
/* 4 byte header size >= 80 */
if (GST_READ_UINT32_LE (data) < 80)
return;
data += 4;
/* 4 byte sample rate <= 48000 */
if (GST_READ_UINT32_LE (data) > 48000)
return;
data += 4;
/* currently there are only 3 speex modes. */
if (GST_READ_UINT32_LE (data) > 3)
return;
data += 12;
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, SPEEX_CAPS);
}
}
/*** audio/x-celt ***/
static GstStaticCaps celt_caps = GST_STATIC_CAPS ("audio/x-celt");
#define CELT_CAPS (gst_static_caps_get(&celt_caps))
static void
celt_type_find (GstTypeFind * tf, gpointer private)
{
const guint8 *data = gst_type_find_peek (tf, 0, 8);
if (data) {
/* 8 byte string "CELT " */
if (memcmp (data, "CELT ", 8) != 0)
return;
/* TODO: Check other values of the CELT header */
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, CELT_CAPS);
}
}
/*** application/x-ogg-skeleton ***/
static GstStaticCaps ogg_skeleton_caps =
GST_STATIC_CAPS ("application/x-ogg-skeleton, parsed=(boolean)FALSE");
#define OGG_SKELETON_CAPS (gst_static_caps_get(&ogg_skeleton_caps))
static void
oggskel_type_find (GstTypeFind * tf, gpointer private)
{
const guint8 *data = gst_type_find_peek (tf, 0, 12);
if (data) {
/* 8 byte string "fishead\0" for the ogg skeleton stream */
if (memcmp (data, "fishead\0", 8) != 0)
return;
data += 8;
/* Require that the header contains version 3.0 */
if (GST_READ_UINT16_LE (data) != 3)
return;
data += 2;
if (GST_READ_UINT16_LE (data) != 0)
return;
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, OGG_SKELETON_CAPS);
}
}
static GstStaticCaps cmml_caps = GST_STATIC_CAPS ("text/x-cmml");
#define CMML_CAPS (gst_static_caps_get(&cmml_caps))
static void
cmml_type_find (GstTypeFind * tf, gpointer private)
{
/* Header is 12 bytes minimum (though we don't check the minor version */
const guint8 *data = gst_type_find_peek (tf, 0, 12);
if (data) {
/* 8 byte string "CMML\0\0\0\0" for the magic number */
if (memcmp (data, "CMML\0\0\0\0", 8) != 0)
return;
data += 8;
/* Require that the header contains at least version 2.0 */
if (GST_READ_UINT16_LE (data) < 2)
return;
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, CMML_CAPS);
}
}
/*** application/x-tar ***/
static GstStaticCaps tar_caps = GST_STATIC_CAPS ("application/x-tar");
#define TAR_CAPS (gst_static_caps_get(&tar_caps))
#define OLDGNU_MAGIC "ustar " /* 7 chars and a NUL */
#define NEWGNU_MAGIC "ustar" /* 5 chars and a NUL */
static void
tar_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data = gst_type_find_peek (tf, 257, 8);
/* of course we are not certain, but we don't want other typefind funcs
* to detect formats of files within the tar archive, e.g. mp3s */
if (data) {
if (memcmp (data, OLDGNU_MAGIC, 8) == 0) { /* sic */
gst_type_find_suggest (tf, GST_TYPE_FIND_NEARLY_CERTAIN, TAR_CAPS);
} else if (memcmp (data, NEWGNU_MAGIC, 6) == 0 && /* sic */
g_ascii_isdigit (data[6]) && g_ascii_isdigit (data[7])) {
gst_type_find_suggest (tf, GST_TYPE_FIND_NEARLY_CERTAIN, TAR_CAPS);
}
}
}
/*** application/x-ar ***/
static GstStaticCaps ar_caps = GST_STATIC_CAPS ("application/x-ar");
#define AR_CAPS (gst_static_caps_get(&ar_caps))
static void
ar_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data = gst_type_find_peek (tf, 0, 24);
if (data && memcmp (data, "!<arch>", 7) == 0) {
gint i;
for (i = 7; i < 24; ++i) {
if (!g_ascii_isprint (data[i]) && data[i] != '\n') {
gst_type_find_suggest (tf, GST_TYPE_FIND_POSSIBLE, AR_CAPS);
}
}
gst_type_find_suggest (tf, GST_TYPE_FIND_NEARLY_CERTAIN, AR_CAPS);
}
}
/*** audio/x-au ***/
/* NOTE: we cannot replace this function with TYPE_FIND_REGISTER_START_WITH,
* as it is only possible to register one typefind factory per 'name'
* (which is in this case the caps), and the first one would be replaced by
* the second one. */
static GstStaticCaps au_caps = GST_STATIC_CAPS ("audio/x-au");
#define AU_CAPS (gst_static_caps_get(&au_caps))
static void
au_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data = gst_type_find_peek (tf, 0, 4);
if (data) {
if (memcmp (data, ".snd", 4) == 0 || memcmp (data, "dns.", 4) == 0) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, AU_CAPS);
}
}
}
/*** video/x-nuv ***/
/* NOTE: we cannot replace this function with TYPE_FIND_REGISTER_START_WITH,
* as it is only possible to register one typefind factory per 'name'
* (which is in this case the caps), and the first one would be replaced by
* the second one. */
static GstStaticCaps nuv_caps = GST_STATIC_CAPS ("video/x-nuv");
#define NUV_CAPS (gst_static_caps_get(&nuv_caps))
static void
nuv_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data = gst_type_find_peek (tf, 0, 11);
if (data) {
if (memcmp (data, "MythTVVideo", 11) == 0
|| memcmp (data, "NuppelVideo", 11) == 0) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, NUV_CAPS);
}
}
}
/*** audio/x-paris ***/
/* NOTE: do not replace this function with two TYPE_FIND_REGISTER_START_WITH */
static GstStaticCaps paris_caps = GST_STATIC_CAPS ("audio/x-paris");
#define PARIS_CAPS (gst_static_caps_get(&paris_caps))
static void
paris_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data = gst_type_find_peek (tf, 0, 4);
if (data) {
if (memcmp (data, " paf", 4) == 0 || memcmp (data, "fap ", 4) == 0) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, PARIS_CAPS);
}
}
}
/*** audio/x-sbc ***/
static GstStaticCaps sbc_caps = GST_STATIC_CAPS ("audio/x-sbc");
#define SBC_CAPS (gst_static_caps_get(&sbc_caps))
static gsize
sbc_check_header (const guint8 * data, gsize len, guint * rate,
guint * channels)
{
static const guint16 sbc_rates[4] = { 16000, 32000, 44100, 48000 };
static const guint8 sbc_blocks[4] = { 4, 8, 12, 16 };
guint n_blocks, ch_mode, n_subbands, bitpool;
if (data[0] != 0x9C || len < 4)
return 0;
n_blocks = sbc_blocks[(data[1] >> 4) & 0x03];
ch_mode = (data[1] >> 2) & 0x03;
n_subbands = (data[1] & 0x01) ? 8 : 4;
bitpool = data[2];
if (bitpool < 2)
return 0;
*rate = sbc_rates[(data[1] >> 6) & 0x03];
*channels = (ch_mode == 0) ? 1 : 2;
if (ch_mode == 0)
return 4 + (n_subbands * 1) / 2 + (n_blocks * 1 * bitpool) / 8;
else if (ch_mode == 1)
return 4 + (n_subbands * 2) / 2 + (n_blocks * 2 * bitpool) / 8;
else if (ch_mode == 2)
return 4 + (n_subbands * 2) / 2 + (n_blocks * bitpool) / 8;
else if (ch_mode == 3)
return 4 + (n_subbands * 2) / 2 + (n_subbands + n_blocks * bitpool) / 8;
return 0;
}
static void
sbc_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data;
gsize frame_len;
guint i, rate, channels, offset = 0;
for (i = 0; i < 10; ++i) {
data = gst_type_find_peek (tf, offset, 8);
if (data == NULL)
return;
frame_len = sbc_check_header (data, 8, &rate, &channels);
if (frame_len == 0)
return;
offset += frame_len;
}
gst_type_find_suggest_simple (tf, GST_TYPE_FIND_POSSIBLE, "audio/x-sbc",
"rate", G_TYPE_INT, rate, "channels", G_TYPE_INT, channels,
"parsed", G_TYPE_BOOLEAN, FALSE, NULL);
}
/*** audio/iLBC-sh ***/
/* NOTE: do not replace this function with two TYPE_FIND_REGISTER_START_WITH */
static GstStaticCaps ilbc_caps = GST_STATIC_CAPS ("audio/iLBC-sh");
#define ILBC_CAPS (gst_static_caps_get(&ilbc_caps))
static void
ilbc_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data = gst_type_find_peek (tf, 0, 8);
if (data) {
if (memcmp (data, "#!iLBC30", 8) == 0 || memcmp (data, "#!iLBC20", 8) == 0) {
gst_type_find_suggest (tf, GST_TYPE_FIND_LIKELY, ILBC_CAPS);
}
}
}
/*** application/x-ms-dos-executable ***/
static GstStaticCaps msdos_caps =
GST_STATIC_CAPS ("application/x-ms-dos-executable");
#define MSDOS_CAPS (gst_static_caps_get(&msdos_caps))
/* see http://www.madchat.org/vxdevl/papers/winsys/pefile/pefile.htm */
static void
msdos_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data = gst_type_find_peek (tf, 0, 64);
if (data && data[0] == 'M' && data[1] == 'Z' &&
GST_READ_UINT16_LE (data + 8) == 4) {
guint32 pe_offset = GST_READ_UINT32_LE (data + 60);
data = gst_type_find_peek (tf, pe_offset, 2);
if (data && data[0] == 'P' && data[1] == 'E') {
gst_type_find_suggest (tf, GST_TYPE_FIND_NEARLY_CERTAIN, MSDOS_CAPS);
}
}
}
/*** application/x-mmsh ***/
static GstStaticCaps mmsh_caps = GST_STATIC_CAPS ("application/x-mmsh");
#define MMSH_CAPS gst_static_caps_get(&mmsh_caps)
/* This is to recognise mssh-over-http */
static void
mmsh_type_find (GstTypeFind * tf, gpointer unused)
{
static const guint8 asf_marker[16] = { 0x30, 0x26, 0xb2, 0x75, 0x8e, 0x66,
0xcf, 0x11, 0xa6, 0xd9, 0x00, 0xaa, 0x00, 0x62, 0xce, 0x6c
};
const guint8 *data;
data = gst_type_find_peek (tf, 0, 2 + 2 + 4 + 2 + 2 + 16);
if (data && data[0] == 0x24 && data[1] == 0x48 &&
GST_READ_UINT16_LE (data + 2) > 2 + 2 + 4 + 2 + 2 + 16 &&
memcmp (data + 2 + 2 + 4 + 2 + 2, asf_marker, 16) == 0) {
gst_type_find_suggest (tf, GST_TYPE_FIND_LIKELY, MMSH_CAPS);
}
}
/*** video/x-dirac ***/
/* NOTE: we cannot replace this function with TYPE_FIND_REGISTER_START_WITH,
* as it is only possible to register one typefind factory per 'name'
* (which is in this case the caps), and the first one would be replaced by
* the second one. */
static GstStaticCaps dirac_caps = GST_STATIC_CAPS ("video/x-dirac");
#define DIRAC_CAPS (gst_static_caps_get(&dirac_caps))
static void
dirac_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data = gst_type_find_peek (tf, 0, 8);
if (data) {
if (memcmp (data, "BBCD", 4) == 0 || memcmp (data, "KW-DIRAC", 8) == 0) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, DIRAC_CAPS);
}
}
}
/*** video/vivo ***/
static GstStaticCaps vivo_caps = GST_STATIC_CAPS ("video/vivo");
#define VIVO_CAPS gst_static_caps_get(&vivo_caps)
static void
vivo_type_find (GstTypeFind * tf, gpointer unused)
{
static const guint8 vivo_marker[] = { 'V', 'e', 'r', 's', 'i', 'o', 'n',
':', 'V', 'i', 'v', 'o', '/'
};
const guint8 *data;
guint hdr_len, pos;
data = gst_type_find_peek (tf, 0, 1024);
if (data == NULL || data[0] != 0x00)
return;
if ((data[1] & 0x80)) {
if ((data[2] & 0x80))
return;
hdr_len = ((guint) (data[1] & 0x7f)) << 7;
hdr_len += data[2];
if (hdr_len > 2048)
return;
pos = 3;
} else {
hdr_len = data[1];
pos = 2;
}
/* 1008 = 1022 - strlen ("Version:Vivo/") - 1 */
while (pos < 1008 && data[pos] == '\r' && data[pos + 1] == '\n')
pos += 2;
if (memcmp (data + pos, vivo_marker, sizeof (vivo_marker)) == 0) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, VIVO_CAPS);
}
}
/*** XDG MIME typefinder (to avoid false positives mostly) ***/
#ifdef USE_GIO
static void
xdgmime_typefind (GstTypeFind * find, gpointer user_data)
{
gchar *mimetype;
gsize length = 16384;
guint64 tf_length;
const guint8 *data;
gchar *tmp;
if ((tf_length = gst_type_find_get_length (find)) > 0)
length = MIN (length, tf_length);
if ((data = gst_type_find_peek (find, 0, length)) == NULL)
return;
tmp = g_content_type_guess (NULL, data, length, NULL);
if (tmp == NULL || g_content_type_is_unknown (tmp)) {
g_free (tmp);
return;
}
mimetype = g_content_type_get_mime_type (tmp);
g_free (tmp);
if (mimetype == NULL)
return;
GST_DEBUG ("Got mimetype '%s'", mimetype);
/* Ignore audio/video types:
* - our own typefinders in -base are likely to be better at this
* (and if they're not, we really want to fix them, that's why we don't
* report xdg-detected audio/video types at all, not even with a low
* probability)
* - we want to detect GStreamer media types and not MIME types
* - the purpose of this xdg mime finder is mainly to prevent false
* positives of non-media formats, not to typefind audio/video formats */
if (g_str_has_prefix (mimetype, "audio/") ||
g_str_has_prefix (mimetype, "video/")) {
GST_LOG ("Ignoring audio/video mime type");
g_free (mimetype);
return;
}
/* Again, we mainly want the xdg typefinding to prevent false-positives on
* non-media formats, so suggest the type with a probability that trumps
* uncertain results of our typefinders, but not more than that. */
GST_LOG ("Suggesting '%s' with probability POSSIBLE", mimetype);
gst_type_find_suggest_simple (find, GST_TYPE_FIND_POSSIBLE, mimetype, NULL);
g_free (mimetype);
}
#endif /* USE_GIO */
/*** Windows icon typefinder (to avoid false positives mostly) ***/
static void
windows_icon_typefind (GstTypeFind * find, gpointer user_data)
{
const guint8 *data;
gint64 datalen;
guint16 type, nimages;
gint32 size, offset;
datalen = gst_type_find_get_length (find);
if (datalen < 18)
return;
if ((data = gst_type_find_peek (find, 0, 6)) == NULL)
return;
/* header - simple and not enough to rely on it alone */
if (GST_READ_UINT16_LE (data) != 0)
return;
type = GST_READ_UINT16_LE (data + 2);
if (type != 1 && type != 2)
return;
nimages = GST_READ_UINT16_LE (data + 4);
if (nimages == 0) /* we can assume we can't have an empty image file ? */
return;
/* first image */
if (data[6 + 3] != 0)
return;
if (type == 1) {
guint16 planes = GST_READ_UINT16_LE (data + 6 + 4);
if (planes > 1)
return;
}
size = GST_READ_UINT32_LE (data + 6 + 8);
offset = GST_READ_UINT32_LE (data + 6 + 12);
if (offset < 0 || size <= 0 || size >= datalen || offset >= datalen
|| size + offset > datalen)
return;
gst_type_find_suggest_simple (find, GST_TYPE_FIND_NEARLY_CERTAIN,
"image/x-icon", NULL);
}
/*** WAP WBMP typefinder ***/
static void
wbmp_typefind (GstTypeFind * find, gpointer user_data)
{
const guint8 *data;
gint64 datalen;
guint w, h, size;
/* http://en.wikipedia.org/wiki/Wireless_Application_Protocol_Bitmap_Format */
datalen = gst_type_find_get_length (find);
if (datalen == 0)
return;
data = gst_type_find_peek (find, 0, 5);
if (data == NULL)
return;
/* want 0x00 0x00 at start */
if (*data++ != 0 || *data++ != 0)
return;
/* min header size */
size = 4;
/* let's assume max width/height is 65536 */
w = *data++;
if ((w & 0x80)) {
w = (w << 8) | *data++;
if ((w & 0x80))
return;
++size;
data = gst_type_find_peek (find, 4, 2);
if (data == NULL)
return;
}
h = *data++;
if ((h & 0x80)) {
h = (h << 8) | *data++;
if ((h & 0x80))
return;
++size;
}
if (w == 0 || h == 0)
return;
/* now add bitmap size */
size += h * (GST_ROUND_UP_8 (w) / 8);
if (datalen == size) {
gst_type_find_suggest_simple (find, GST_TYPE_FIND_POSSIBLE - 10,
"image/vnd.wap.wbmp", NULL);
}
}
/*** DEGAS Atari images (also to avoid false positives, see #625129) ***/
static void
degas_type_find (GstTypeFind * tf, gpointer private)
{
/* No magic, but it should have a fixed size and a few invalid values */
/* http://www.fileformat.info/format/atari/spec/6ecf9f6eb5be494284a47feb8a214687/view.htm */
gint64 len;
const guint8 *data;
guint16 resolution;
int n;
len = gst_type_find_get_length (tf);
if (len < 34) /* smallest header of the lot */
return;
data = gst_type_find_peek (tf, 0, 4);
if (G_UNLIKELY (data == NULL))
return;
resolution = GST_READ_UINT16_BE (data);
if (len == 32034) {
/* could be DEGAS */
if (resolution <= 2)
gst_type_find_suggest_simple (tf, GST_TYPE_FIND_POSSIBLE + 5,
"image/x-degas", NULL);
} else if (len == 32066) {
/* could be DEGAS Elite */
if (resolution <= 2) {
data = gst_type_find_peek (tf, len - 16, 8);
if (G_UNLIKELY (data == NULL))
return;
for (n = 0; n < 4; n++) {
if (GST_READ_UINT16_BE (data + n * 2) > 2)
return;
}
gst_type_find_suggest_simple (tf, GST_TYPE_FIND_POSSIBLE + 5,
"image/x-degas", NULL);
}
} else if (len >= 66 && len < 32066) {
/* could be compressed DEGAS Elite, but it's compressed and so we can't rely on size,
it does have 4 16 bytes values near the end that are 0-2 though. */
if ((resolution & 0x8000) && (resolution & 0x7fff) <= 2) {
data = gst_type_find_peek (tf, len - 16, 8);
if (G_UNLIKELY (data == NULL))
return;
for (n = 0; n < 4; n++) {
if (GST_READ_UINT16_BE (data + n * 2) > 2)
return;
}
gst_type_find_suggest_simple (tf, GST_TYPE_FIND_POSSIBLE + 5,
"image/x-degas", NULL);
}
}
}
/*** y4m ***/
static void
y4m_typefind (GstTypeFind * tf, gpointer private)
{
const guint8 *data;
data = gst_type_find_peek (tf, 0, 10);
if (data != NULL && memcmp (data, "YUV4MPEG2 ", 10) == 0) {
gst_type_find_suggest_simple (tf, GST_TYPE_FIND_LIKELY,
"application/x-yuv4mpeg", "y4mversion", G_TYPE_INT, 2, NULL);
}
}
/*** DVD ISO images (looks like H.264, see #674069) ***/
static void
dvdiso_type_find (GstTypeFind * tf, gpointer private)
{
/* 0x8000 bytes of zeros, then "\001CD001" */
gint64 len;
const guint8 *data;
len = gst_type_find_get_length (tf);
if (len < 0x8006)
return;
data = gst_type_find_peek (tf, 0, 0x8006);
if (G_UNLIKELY (data == NULL))
return;
for (len = 0; len < 0x8000; len++)
if (data[len])
return;
/* Can the '1' be anything else ? My three samples all have '1'. */
if (memcmp (data + 0x8000, "\001CD001", 6))
return;
/* May need more inspection, we may be able to demux some of them */
gst_type_find_suggest_simple (tf, GST_TYPE_FIND_LIKELY,
"application/octet-stream", NULL);
}
/* SSA/ASS subtitles
*
* http://en.wikipedia.org/wiki/SubStation_Alpha
* http://matroska.org/technical/specs/subtitles/ssa.html
*/
static void
ssa_type_find (GstTypeFind * tf, gpointer private)
{
const gchar *start, *end, *ver_str, *media_type = NULL;
const guint8 *data;
gchar *str, *script_type, *p = NULL;
gint64 len;
data = gst_type_find_peek (tf, 0, 32);
if (data == NULL)
return;
/* FIXME: detect utf-16/32 BOM and convert before typefinding the rest */
/* there might be a UTF-8 BOM at the beginning */
if (memcmp (data, "[Script Info]", 13) != 0 &&
memcmp (data + 3, "[Script Info]", 13) != 0) {
return;
}
/* now check if we have SSA or ASS */
len = gst_type_find_get_length (tf);
if (len > 8192)
len = 8192;
data = gst_type_find_peek (tf, 0, len);
if (data == NULL)
return;
/* skip BOM */
start = (gchar *) memchr (data, '[', 5);
g_assert (start);
len -= (start - (gchar *) data);
/* ignore anything non-UTF8 for now, in future we might at least allow
* other UTF variants that are clearly prefixed with the appropriate BOM */
if (!g_utf8_validate (start, len, &end) && (len - (end - start)) > 6) {
GST_FIXME ("non-UTF8 SSA/ASS file");
return;
}
/* something at start, but not a UTF-8 BOM? */
if (data[0] != '[' && (data[0] != 0xEF || data[1] != 0xBB || data[2] != 0xBF))
return;
/* ignore any partial UTF-8 characters at the end */
len = end - start;
/* create a NUL-terminated string so it's easier to process it safely */
str = g_strndup (start, len - 1);
script_type = strstr (str, "ScriptType:");
if (script_type != NULL) {
gdouble version;
ver_str = script_type + 11;
while (*ver_str == ' ' || *ver_str == 'v' || *ver_str == 'V')
++ver_str;
version = g_ascii_strtod (ver_str, &p);
if (version == 4.0 && p != NULL && *p == '+')
media_type = "application/x-ass";
else if (version >= 1.0 && version <= 4.0)
media_type = "application/x-ssa";
}
if (media_type == NULL) {
if (strstr (str, "[v4+ Styles]") || strstr (str, "[V4+ Styles]"))
media_type = "application/x-ass";
else if (strstr (str, "[v4 Styles]") || strstr (str, "[V4 Styles]"))
media_type = "application/x-ssa";
}
if (media_type != NULL) {
gst_type_find_suggest_simple (tf, GST_TYPE_FIND_MAXIMUM,
media_type, "parsed", G_TYPE_BOOLEAN, FALSE, NULL);
} else {
GST_WARNING ("could not detect SSA/ASS variant");
}
g_free (str);
}
/*** video/x-pva ***/
static GstStaticCaps pva_caps = GST_STATIC_CAPS ("video/x-pva");
#define PVA_CAPS gst_static_caps_get(&pva_caps)
static void
pva_type_find (GstTypeFind * tf, gpointer private)
{
const guint8 *data;
data = gst_type_find_peek (tf, 0, 5);
if (data == NULL)
return;
if (data[0] == 'A' && data[1] == 'V' && data[2] < 3 && data[4] == 0x55)
gst_type_find_suggest (tf, GST_TYPE_FIND_NEARLY_CERTAIN, PVA_CAPS);
}
/*** audio/audible ***/
/* derived from pyaudibletags
* http://code.google.com/p/pyaudibletags/source/browse/trunk/pyaudibletags.py
*/
static GstStaticCaps aa_caps = GST_STATIC_CAPS ("audio/x-audible");
#define AA_CAPS gst_static_caps_get(&aa_caps)
static void
aa_type_find (GstTypeFind * tf, gpointer private)
{
const guint8 *data;
data = gst_type_find_peek (tf, 0, 12);
if (data == NULL)
return;
if (GST_READ_UINT32_BE (data + 4) == 0x57907536) {
guint64 media_len;
media_len = gst_type_find_get_length (tf);
if (media_len > 0 && GST_READ_UINT32_BE (data) == media_len)
gst_type_find_suggest (tf, GST_TYPE_FIND_NEARLY_CERTAIN, AA_CAPS);
else
gst_type_find_suggest (tf, GST_TYPE_FIND_POSSIBLE, AA_CAPS);
}
}
/*** generic typefind for streams that have some data at a specific position***/
typedef struct
{
const guint8 *data;
guint size;
guint probability;
GstCaps *caps;
}
GstTypeFindData;
static void
start_with_type_find (GstTypeFind * tf, gpointer private)
{
GstTypeFindData *start_with = (GstTypeFindData *) private;
const guint8 *data;
GST_LOG ("trying to find mime type %s with the first %u bytes of data",
gst_structure_get_name (gst_caps_get_structure (start_with->caps, 0)),
start_with->size);
data = gst_type_find_peek (tf, 0, start_with->size);
if (data && memcmp (data, start_with->data, start_with->size) == 0) {
gst_type_find_suggest (tf, start_with->probability, start_with->caps);
}
}
static void
sw_data_destroy (GstTypeFindData * sw_data)
{
if (G_LIKELY (sw_data->caps != NULL))
gst_caps_unref (sw_data->caps);
g_slice_free (GstTypeFindData, sw_data);
}
#define TYPE_FIND_REGISTER_START_WITH(plugin,name,rank,ext,_data,_size,_probability)\
G_BEGIN_DECLS{ \
GstTypeFindData *sw_data = g_slice_new (GstTypeFindData); \
sw_data->data = (const guint8 *)_data; \
sw_data->size = _size; \
sw_data->probability = _probability; \
sw_data->caps = gst_caps_new_empty_simple (name); \
if (!gst_type_find_register (plugin, name, rank, start_with_type_find,\
ext, sw_data->caps, sw_data, \
(GDestroyNotify) (sw_data_destroy))) { \
sw_data_destroy (sw_data); \
} \
}G_END_DECLS
/*** same for riff types ***/
static void
riff_type_find (GstTypeFind * tf, gpointer private)
{
GstTypeFindData *riff_data = (GstTypeFindData *) private;
const guint8 *data = gst_type_find_peek (tf, 0, 12);
if (data && (memcmp (data, "RIFF", 4) == 0 || memcmp (data, "AVF0", 4) == 0)) {
data += 8;
if (memcmp (data, riff_data->data, 4) == 0)
gst_type_find_suggest (tf, riff_data->probability, riff_data->caps);
}
}
#define TYPE_FIND_REGISTER_RIFF(plugin,name,rank,ext,_data) \
G_BEGIN_DECLS{ \
GstTypeFindData *sw_data = g_slice_new (GstTypeFindData); \
sw_data->data = (gpointer)_data; \
sw_data->size = 4; \
sw_data->probability = GST_TYPE_FIND_MAXIMUM; \
sw_data->caps = gst_caps_new_empty_simple (name); \
if (!gst_type_find_register (plugin, name, rank, riff_type_find, \
ext, sw_data->caps, sw_data, \
(GDestroyNotify) (sw_data_destroy))) { \
sw_data_destroy (sw_data); \
} \
}G_END_DECLS
/*** plugin initialization ***/
#define TYPE_FIND_REGISTER(plugin,name,rank,func,ext,caps,priv,notify) \
G_BEGIN_DECLS{\
if (!gst_type_find_register (plugin, name, rank, func, ext, caps, priv, notify))\
return FALSE; \
}G_END_DECLS
static gboolean
plugin_init (GstPlugin * plugin)
{
/* can't initialize this via a struct as caps can't be statically initialized */
GST_DEBUG_CATEGORY_INIT (type_find_debug, "typefindfunctions",
GST_DEBUG_FG_GREEN | GST_DEBUG_BG_RED, "generic type find functions");
/* note: asx/wax/wmx are XML files, asf doesn't handle them */
/* must use strings, macros don't accept initializers */
TYPE_FIND_REGISTER_START_WITH (plugin, "video/x-ms-asf", GST_RANK_SECONDARY,
"asf,wm,wma,wmv",
"\060\046\262\165\216\146\317\021\246\331\000\252\000\142\316\154", 16,
GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER (plugin, "audio/x-musepack", GST_RANK_PRIMARY,
musepack_type_find, "mpc,mpp,mp+", MUSEPACK_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "audio/x-au", GST_RANK_MARGINAL,
au_type_find, "au,snd", AU_CAPS, NULL, NULL);
TYPE_FIND_REGISTER_RIFF (plugin, "video/x-msvideo", GST_RANK_PRIMARY,
"avi", "AVI ");
TYPE_FIND_REGISTER_RIFF (plugin, "audio/qcelp", GST_RANK_PRIMARY,
"qcp", "QLCM");
TYPE_FIND_REGISTER_RIFF (plugin, "video/x-cdxa", GST_RANK_PRIMARY,
"dat", "CDXA");
TYPE_FIND_REGISTER_START_WITH (plugin, "video/x-vcd", GST_RANK_PRIMARY,
"dat", "\000\377\377\377\377\377\377\377\377\377\377\000", 12,
GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER_START_WITH (plugin, "audio/x-imelody", GST_RANK_PRIMARY,
"imy,ime,imelody", "BEGIN:IMELODY", 13, GST_TYPE_FIND_MAXIMUM);
#if 0
TYPE_FIND_REGISTER_START_WITH (plugin, "video/x-smoke", GST_RANK_PRIMARY,
NULL, "\x80smoke\x00\x01\x00", 6, GST_TYPE_FIND_MAXIMUM);
#endif
TYPE_FIND_REGISTER (plugin, "audio/midi", GST_RANK_PRIMARY, mid_type_find,
"mid,midi", MID_CAPS, NULL, NULL);
TYPE_FIND_REGISTER_RIFF (plugin, "audio/riff-midi", GST_RANK_PRIMARY,
"mid,midi", "RMID");
TYPE_FIND_REGISTER (plugin, "audio/mobile-xmf", GST_RANK_PRIMARY,
mxmf_type_find, "mxmf", MXMF_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/x-fli", GST_RANK_MARGINAL, flx_type_find,
"flc,fli", FLX_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/x-id3v2", GST_RANK_PRIMARY + 103,
id3v2_type_find, "mp3,mp2,mp1,mpga,ogg,flac,tta", ID3_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/x-id3v1", GST_RANK_PRIMARY + 101,
id3v1_type_find, "mp3,mp2,mp1,mpga,ogg,flac,tta", ID3_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/x-apetag", GST_RANK_PRIMARY + 102,
apetag_type_find, "mp3,ape,mpc,wv", APETAG_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "audio/x-ttafile", GST_RANK_PRIMARY,
tta_type_find, "tta", TTA_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "audio/x-mod", GST_RANK_SECONDARY, mod_type_find,
"669,amf,ams,dbm,digi,dmf,dsm,gdm,far,imf,it,j2b,mdl,med,mod,mt2,mtm,"
"okt,psm,ptm,sam,s3m,stm,stx,ult,umx,xm", MOD_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "audio/mpeg", GST_RANK_PRIMARY, mp3_type_find,
"mp3,mp2,mp1,mpga", MP3_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "audio/x-ac3", GST_RANK_PRIMARY, ac3_type_find,
"ac3,eac3", AC3_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "audio/x-dts", GST_RANK_SECONDARY, dts_type_find,
"dts", DTS_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "audio/x-gsm", GST_RANK_PRIMARY, NULL, "gsm",
GSM_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/mpeg-sys", GST_RANK_PRIMARY,
mpeg_sys_type_find, "mpe,mpeg,mpg", MPEG_SYS_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/mpegts", GST_RANK_PRIMARY,
mpeg_ts_type_find, "ts,mts", MPEGTS_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/ogg", GST_RANK_PRIMARY,
ogganx_type_find, "ogg,oga,ogv,ogm,ogx,spx,anx,axa,axv", OGG_CAPS,
NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/mpeg-elementary", GST_RANK_MARGINAL,
mpeg_video_stream_type_find, "mpv,mpeg,mpg", MPEG_VIDEO_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/mpeg4", GST_RANK_PRIMARY,
mpeg4_video_type_find, "m4v", MPEG_VIDEO_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/x-h263", GST_RANK_SECONDARY,
h263_video_type_find, "h263,263", H263_VIDEO_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/x-h264", GST_RANK_PRIMARY,
h264_video_type_find, "h264,x264,264", H264_VIDEO_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/x-h265", GST_RANK_PRIMARY,
h265_video_type_find, "h265,x265,265", H265_VIDEO_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/x-nuv", GST_RANK_SECONDARY, nuv_type_find,
"nuv", NUV_CAPS, NULL, NULL);
/* ISO formats */
TYPE_FIND_REGISTER (plugin, "audio/x-m4a", GST_RANK_PRIMARY, m4a_type_find,
"m4a", M4A_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/x-3gp", GST_RANK_PRIMARY,
q3gp_type_find, "3gp", Q3GP_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/quicktime", GST_RANK_PRIMARY,
qt_type_find, "mov,mp4", QT_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "image/x-quicktime", GST_RANK_SECONDARY,
qtif_type_find, "qif,qtif,qti", QTIF_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "image/jp2", GST_RANK_PRIMARY,
jp2_type_find, "jp2", JP2_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/mj2", GST_RANK_PRIMARY,
jp2_type_find, "mj2", MJ2_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "text/html", GST_RANK_SECONDARY, html_type_find,
"htm,html", HTML_CAPS, NULL, NULL);
TYPE_FIND_REGISTER_START_WITH (plugin, "application/vnd.rn-realmedia",
GST_RANK_SECONDARY, "ra,ram,rm,rmvb", ".RMF", 4, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER_START_WITH (plugin, "application/x-pn-realaudio",
GST_RANK_SECONDARY, "ra,ram,rm,rmvb", ".ra\375", 4,
GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER (plugin, "application/x-shockwave-flash",
GST_RANK_SECONDARY, swf_type_find, "swf,swfl", SWF_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/dash+xml",
GST_RANK_PRIMARY, dash_mpd_type_find, "mpd,MPD", DASH_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/vnd.ms-sstr+xml",
GST_RANK_PRIMARY, mss_manifest_type_find, NULL, MSS_MANIFEST_CAPS, NULL,
NULL);
TYPE_FIND_REGISTER_START_WITH (plugin, "video/x-flv", GST_RANK_SECONDARY,
"flv", "FLV", 3, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER (plugin, "text/plain", GST_RANK_MARGINAL, utf8_type_find,
"txt", UTF8_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "text/utf-16", GST_RANK_MARGINAL, utf16_type_find,
"txt", UTF16_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "text/utf-32", GST_RANK_MARGINAL, utf32_type_find,
"txt", UTF32_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "text/uri-list", GST_RANK_MARGINAL, uri_type_find,
"ram", URI_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/x-hls", GST_RANK_MARGINAL,
hls_type_find, "m3u8", HLS_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/sdp", GST_RANK_SECONDARY,
sdp_type_find, "sdp", SDP_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/smil", GST_RANK_SECONDARY,
smil_type_find, "smil", SMIL_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/ttml+xml", GST_RANK_SECONDARY,
ttml_xml_type_find, "ttml+xml", TTML_XML_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/xml", GST_RANK_MARGINAL,
xml_type_find, "xml", GENERIC_XML_CAPS, NULL, NULL);
TYPE_FIND_REGISTER_RIFF (plugin, "audio/x-wav", GST_RANK_PRIMARY, "wav",
"WAVE");
TYPE_FIND_REGISTER (plugin, "audio/x-aiff", GST_RANK_SECONDARY,
aiff_type_find, "aiff,aif,aifc", AIFF_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "audio/x-svx", GST_RANK_SECONDARY, svx_type_find,
"iff,svx", SVX_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "audio/x-paris", GST_RANK_SECONDARY,
paris_type_find, "paf", PARIS_CAPS, NULL, NULL);
TYPE_FIND_REGISTER_START_WITH (plugin, "audio/x-nist", GST_RANK_SECONDARY,
"nist", "NIST", 4, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER_START_WITH (plugin, "audio/x-voc", GST_RANK_SECONDARY,
"voc", "Creative", 8, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER (plugin, "audio/x-sds", GST_RANK_SECONDARY, sds_type_find,
"sds", SDS_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "audio/x-ircam", GST_RANK_SECONDARY,
ircam_type_find, "sf", IRCAM_CAPS, NULL, NULL);
TYPE_FIND_REGISTER_START_WITH (plugin, "audio/x-w64", GST_RANK_SECONDARY,
"w64", "riff", 4, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER_START_WITH (plugin, "audio/x-rf64", GST_RANK_PRIMARY,
"rf64", "RF64", 4, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER (plugin, "audio/x-shorten", GST_RANK_SECONDARY,
shn_type_find, "shn", SHN_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/x-ape", GST_RANK_SECONDARY,
ape_type_find, "ape", APE_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "image/jpeg", GST_RANK_PRIMARY + 15,
jpeg_type_find, "jpg,jpe,jpeg", JPEG_CAPS, NULL, NULL);
TYPE_FIND_REGISTER_START_WITH (plugin, "image/gif", GST_RANK_PRIMARY, "gif",
"GIF8", 4, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER_START_WITH (plugin, "image/png", GST_RANK_PRIMARY + 14,
"png", "\211PNG\015\012\032\012", 8, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER (plugin, "image/bmp", GST_RANK_PRIMARY, bmp_type_find,
"bmp", BMP_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "image/tiff", GST_RANK_PRIMARY, tiff_type_find,
"tif,tiff", TIFF_CAPS, NULL, NULL);
TYPE_FIND_REGISTER_RIFF (plugin, "image/webp", GST_RANK_PRIMARY,
"webp", "WEBP");
TYPE_FIND_REGISTER (plugin, "image/x-exr", GST_RANK_PRIMARY, exr_type_find,
"exr", EXR_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "image/x-portable-pixmap", GST_RANK_SECONDARY,
pnm_type_find, "pnm,ppm,pgm,pbm", PNM_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/x-matroska", GST_RANK_PRIMARY,
matroska_type_find, "mkv,mka,mk3d,webm", MATROSKA_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/mxf", GST_RANK_PRIMARY,
mxf_type_find, "mxf", MXF_CAPS, NULL, NULL);
TYPE_FIND_REGISTER_START_WITH (plugin, "video/x-mve", GST_RANK_SECONDARY,
"mve", "Interplay MVE File\032\000\032\000\000\001\063\021", 26,
GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER (plugin, "video/x-dv", GST_RANK_SECONDARY, dv_type_find,
"dv,dif", DV_CAPS, NULL, NULL);
TYPE_FIND_REGISTER_START_WITH (plugin, "audio/x-amr-nb-sh", GST_RANK_PRIMARY,
"amr", "#!AMR", 5, GST_TYPE_FIND_LIKELY);
TYPE_FIND_REGISTER_START_WITH (plugin, "audio/x-amr-wb-sh", GST_RANK_PRIMARY,
"amr", "#!AMR-WB", 7, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER (plugin, "audio/iLBC-sh", GST_RANK_PRIMARY, ilbc_type_find,
"ilbc", ILBC_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "audio/x-sbc", GST_RANK_MARGINAL, sbc_type_find,
"sbc", SBC_CAPS, NULL, NULL);
TYPE_FIND_REGISTER_START_WITH (plugin, "audio/x-sid", GST_RANK_MARGINAL,
"sid", "PSID", 4, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER_START_WITH (plugin, "image/x-xcf", GST_RANK_SECONDARY,
"xcf", "gimp xcf", 8, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER_START_WITH (plugin, "video/x-mng", GST_RANK_SECONDARY,
"mng", "\212MNG\015\012\032\012", 8, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER_START_WITH (plugin, "image/x-jng", GST_RANK_SECONDARY,
"jng", "\213JNG\015\012\032\012", 8, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER_START_WITH (plugin, "image/x-xpixmap", GST_RANK_SECONDARY,
"xpm", "/* XPM */", 9, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER_START_WITH (plugin, "image/x-sun-raster",
GST_RANK_SECONDARY, "ras", "\131\246\152\225", 4, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER_START_WITH (plugin, "application/x-bzip",
GST_RANK_SECONDARY, "bz2", "BZh", 3, GST_TYPE_FIND_LIKELY);
TYPE_FIND_REGISTER_START_WITH (plugin, "application/x-gzip",
GST_RANK_SECONDARY, "gz", "\037\213", 2, GST_TYPE_FIND_LIKELY);
TYPE_FIND_REGISTER_START_WITH (plugin, "application/zip", GST_RANK_SECONDARY,
"zip", "PK\003\004", 4, GST_TYPE_FIND_LIKELY);
TYPE_FIND_REGISTER_START_WITH (plugin, "application/x-compress",
GST_RANK_SECONDARY, "Z", "\037\235", 2, GST_TYPE_FIND_LIKELY);
TYPE_FIND_REGISTER (plugin, "subtitle/x-kate", GST_RANK_MARGINAL,
kate_type_find, NULL, NULL, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/x-subtitle-vtt", GST_RANK_MARGINAL,
webvtt_type_find, "vtt", WEBVTT_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "audio/x-flac", GST_RANK_PRIMARY, flac_type_find,
"flac", FLAC_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "audio/x-vorbis", GST_RANK_PRIMARY,
vorbis_type_find, NULL, VORBIS_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/x-theora", GST_RANK_PRIMARY,
theora_type_find, NULL, THEORA_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/x-ogm-video", GST_RANK_PRIMARY,
ogmvideo_type_find, NULL, OGMVIDEO_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/x-ogm-audio", GST_RANK_PRIMARY,
ogmaudio_type_find, NULL, OGMAUDIO_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/x-ogm-text", GST_RANK_PRIMARY,
ogmtext_type_find, NULL, OGMTEXT_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "audio/x-speex", GST_RANK_PRIMARY,
speex_type_find, NULL, SPEEX_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "audio/x-celt", GST_RANK_PRIMARY, celt_type_find,
NULL, CELT_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/x-ogg-skeleton", GST_RANK_PRIMARY,
oggskel_type_find, NULL, OGG_SKELETON_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "text/x-cmml", GST_RANK_PRIMARY, cmml_type_find,
NULL, CMML_CAPS, NULL, NULL);
TYPE_FIND_REGISTER_START_WITH (plugin, "application/x-executable",
GST_RANK_MARGINAL, NULL, "\177ELF", 4, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER (plugin, "audio/aac", GST_RANK_SECONDARY, aac_type_find,
"aac,adts,adif,loas", AAC_CAPS, NULL, NULL);
TYPE_FIND_REGISTER_START_WITH (plugin, "audio/x-spc", GST_RANK_SECONDARY,
"spc", "SNES-SPC700 Sound File Data", 27, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER (plugin, "audio/x-wavpack", GST_RANK_SECONDARY,
wavpack_type_find, "wv,wvp", WAVPACK_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "audio/x-wavpack-correction", GST_RANK_SECONDARY,
wavpack_type_find, "wvc", WAVPACK_CORRECTION_CAPS, NULL, NULL);
TYPE_FIND_REGISTER_START_WITH (plugin, "audio/x-caf", GST_RANK_SECONDARY,
"caf", "caff\000\001", 6, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER (plugin, "application/postscript", GST_RANK_SECONDARY,
postscript_type_find, "ps", POSTSCRIPT_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "image/svg+xml", GST_RANK_SECONDARY,
svg_type_find, "svg", SVG_CAPS, NULL, NULL);
TYPE_FIND_REGISTER_START_WITH (plugin, "application/x-rar",
GST_RANK_SECONDARY, "rar", "Rar!", 4, GST_TYPE_FIND_LIKELY);
TYPE_FIND_REGISTER (plugin, "application/x-tar", GST_RANK_SECONDARY,
tar_type_find, "tar", TAR_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/x-ar", GST_RANK_SECONDARY,
ar_type_find, "a", AR_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/x-ms-dos-executable",
GST_RANK_SECONDARY, msdos_type_find, "dll,exe,ocx,sys,scr,msstyles,cpl",
MSDOS_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/x-dirac", GST_RANK_PRIMARY,
dirac_type_find, NULL, DIRAC_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "multipart/x-mixed-replace", GST_RANK_SECONDARY,
multipart_type_find, NULL, MULTIPART_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/x-mmsh", GST_RANK_SECONDARY,
mmsh_type_find, NULL, MMSH_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/vivo", GST_RANK_SECONDARY, vivo_type_find,
"viv", VIVO_CAPS, NULL, NULL);
TYPE_FIND_REGISTER_START_WITH (plugin, "audio/x-nsf", GST_RANK_SECONDARY,
"nsf", "NESM\x1a", 5, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER_START_WITH (plugin, "audio/x-gym", GST_RANK_SECONDARY,
"gym", "GYMX", 4, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER_START_WITH (plugin, "audio/x-ay", GST_RANK_SECONDARY, "ay",
"ZXAYEMUL", 8, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER_START_WITH (plugin, "audio/x-gbs", GST_RANK_SECONDARY,
"gbs", "GBS\x01", 4, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER_START_WITH (plugin, "audio/x-vgm", GST_RANK_SECONDARY,
"vgm", "Vgm\x20", 4, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER_START_WITH (plugin, "audio/x-sap", GST_RANK_SECONDARY,
"sap", "SAP\x0d\x0a" "AUTHOR\x20", 12, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER_START_WITH (plugin, "video/x-ivf", GST_RANK_SECONDARY,
"ivf", "DKIF", 4, GST_TYPE_FIND_NEARLY_CERTAIN);
TYPE_FIND_REGISTER_START_WITH (plugin, "audio/x-kss", GST_RANK_SECONDARY,
"kss", "KSSX\0", 5, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER_START_WITH (plugin, "application/pdf", GST_RANK_SECONDARY,
"pdf", "%PDF-", 5, GST_TYPE_FIND_LIKELY);
TYPE_FIND_REGISTER_START_WITH (plugin, "application/msword",
GST_RANK_SECONDARY, "doc", "\320\317\021\340\241\261\032\341", 8,
GST_TYPE_FIND_LIKELY);
/* Mac OS X .DS_Store files tend to be taken for video/mpeg */
TYPE_FIND_REGISTER_START_WITH (plugin, "application/octet-stream",
GST_RANK_SECONDARY, "DS_Store", "\000\000\000\001Bud1", 8,
GST_TYPE_FIND_LIKELY);
TYPE_FIND_REGISTER_START_WITH (plugin, "image/vnd.adobe.photoshop",
GST_RANK_SECONDARY, "psd", "8BPS\000\001\000\000\000\000", 10,
GST_TYPE_FIND_LIKELY);
TYPE_FIND_REGISTER (plugin, "image/vnd.wap.wbmp", GST_RANK_MARGINAL,
wbmp_typefind, NULL, NULL, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/x-yuv4mpeg", GST_RANK_SECONDARY,
y4m_typefind, NULL, NULL, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "image/x-icon", GST_RANK_MARGINAL,
windows_icon_typefind, NULL, NULL, NULL, NULL);
#ifdef USE_GIO
TYPE_FIND_REGISTER (plugin, "xdgmime-base", GST_RANK_MARGINAL,
xdgmime_typefind, NULL, NULL, NULL, NULL);
#endif
TYPE_FIND_REGISTER (plugin, "image/x-degas", GST_RANK_MARGINAL,
degas_type_find, NULL, NULL, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/octet-stream", GST_RANK_MARGINAL,
dvdiso_type_find, NULL, NULL, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/x-ssa", GST_RANK_SECONDARY,
ssa_type_find, "ssa,ass", NULL, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/x-pva", GST_RANK_SECONDARY,
pva_type_find, "pva", PVA_CAPS, NULL, NULL);
TYPE_FIND_REGISTER_START_WITH (plugin, "audio/x-xi", GST_RANK_SECONDARY,
"xi", "Extended Instrument: ", 21, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER (plugin, "audio/audible", GST_RANK_MARGINAL,
aa_type_find, "aa,aax", AA_CAPS, NULL, NULL);
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
typefindfunctions,
"default typefind functions",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)