blob: 8756547039257a7b6eae8b5526d2240fbddc9d13 [file] [log] [blame]
/*
* Copyright (C) 2014 Stefan Ringel
*
* Authors:
* Stefan Ringel <linuxtv@stefanringel.de>
*
* 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.
*/
#include <string.h>
#include <stdlib.h>
#include "mpegts.h"
#include "gstmpegts-private.h"
/**
* SECTION:gst-atsc-section
* @title: ATSC variants of MPEG-TS sections
* @short_description: Sections for the various ATSC specifications
* @include: gst/mpegts/mpegts.h
*
*/
/* Terrestrial/Cable Virtual Channel Table TVCT/CVCT */
static GstMpegTsAtscVCTSource *
_gst_mpegts_atsc_vct_source_copy (GstMpegTsAtscVCTSource * source)
{
GstMpegTsAtscVCTSource *copy;
copy = g_slice_dup (GstMpegTsAtscVCTSource, source);
copy->descriptors = g_ptr_array_ref (source->descriptors);
return copy;
}
static void
_gst_mpegts_atsc_vct_source_free (GstMpegTsAtscVCTSource * source)
{
if (source->descriptors)
g_ptr_array_unref (source->descriptors);
g_slice_free (GstMpegTsAtscVCTSource, source);
}
G_DEFINE_BOXED_TYPE (GstMpegTsAtscVCTSource, gst_mpegts_atsc_vct_source,
(GBoxedCopyFunc) _gst_mpegts_atsc_vct_source_copy,
(GFreeFunc) _gst_mpegts_atsc_vct_source_free);
static GstMpegTsAtscVCT *
_gst_mpegts_atsc_vct_copy (GstMpegTsAtscVCT * vct)
{
GstMpegTsAtscVCT *copy;
copy = g_slice_dup (GstMpegTsAtscVCT, vct);
copy->sources = g_ptr_array_ref (vct->sources);
copy->descriptors = g_ptr_array_ref (vct->descriptors);
return copy;
}
static void
_gst_mpegts_atsc_vct_free (GstMpegTsAtscVCT * vct)
{
if (vct->sources)
g_ptr_array_unref (vct->sources);
if (vct->descriptors)
g_ptr_array_unref (vct->descriptors);
g_slice_free (GstMpegTsAtscVCT, vct);
}
G_DEFINE_BOXED_TYPE (GstMpegTsAtscVCT, gst_mpegts_atsc_vct,
(GBoxedCopyFunc) _gst_mpegts_atsc_vct_copy,
(GFreeFunc) _gst_mpegts_atsc_vct_free);
static gpointer
_parse_atsc_vct (GstMpegTsSection * section)
{
GstMpegTsAtscVCT *vct = NULL;
guint8 *data, *end, source_nb;
guint32 tmp32;
guint16 descriptors_loop_length, tmp16;
guint i;
GError *err = NULL;
vct = g_slice_new0 (GstMpegTsAtscVCT);
data = section->data;
end = data + section->section_length;
vct->transport_stream_id = section->subtable_extension;
/* Skip already parsed data */
data += 8;
/* minimum size */
if (end - data < 2 + 2 + 4)
goto error;
vct->protocol_version = *data;
data += 1;
source_nb = *data;
data += 1;
vct->sources = g_ptr_array_new_full (source_nb,
(GDestroyNotify) _gst_mpegts_atsc_vct_source_free);
for (i = 0; i < source_nb; i++) {
GstMpegTsAtscVCTSource *source;
/* minimum 32 bytes for a entry, 2 bytes second descriptor
loop-length, 4 bytes crc */
if (end - data < 32 + 2 + 4)
goto error;
source = g_slice_new0 (GstMpegTsAtscVCTSource);
g_ptr_array_add (vct->sources, source);
source->short_name =
g_convert ((gchar *) data, 14, "utf-8", "utf-16be", NULL, NULL, &err);
if (err) {
GST_WARNING ("Failed to convert VCT Source short_name to utf-8: %d %s",
err->code, err->message);
GST_MEMDUMP ("UTF-16 string", data, 14);
g_error_free (err);
}
data += 14;
tmp32 = GST_READ_UINT32_BE (data);
source->major_channel_number = (tmp32 >> 18) & 0x03FF;
source->minor_channel_number = (tmp32 >> 8) & 0x03FF;
source->modulation_mode = tmp32 & 0xF;
data += 4;
source->carrier_frequency = GST_READ_UINT32_BE (data);
data += 4;
source->channel_TSID = GST_READ_UINT16_BE (data);
data += 2;
source->program_number = GST_READ_UINT16_BE (data);
data += 2;
tmp16 = GST_READ_UINT16_BE (data);
source->ETM_location = (tmp16 >> 14) & 0x3;
source->access_controlled = (tmp16 >> 13) & 0x1;
source->hidden = (tmp16 >> 12) & 0x1;
/* only used in CVCT */
source->path_select = (tmp16 >> 11) & 0x1;
source->out_of_band = (tmp16 >> 10) & 0x1;
source->hide_guide = (tmp16 >> 9) & 0x1;
source->service_type = tmp16 & 0x3f;
data += 2;
source->source_id = GST_READ_UINT16_BE (data);
data += 2;
descriptors_loop_length = GST_READ_UINT16_BE (data) & 0x03FF;
data += 2;
if (end - data < descriptors_loop_length + 6)
goto error;
source->descriptors =
gst_mpegts_parse_descriptors (data, descriptors_loop_length);
if (source->descriptors == NULL)
goto error;
data += descriptors_loop_length;
}
descriptors_loop_length = GST_READ_UINT16_BE (data) & 0x03FF;
data += 2;
if (end - data < descriptors_loop_length + 4)
goto error;
vct->descriptors =
gst_mpegts_parse_descriptors (data, descriptors_loop_length);
if (vct->descriptors == NULL)
goto error;
data += descriptors_loop_length;
return (gpointer) vct;
error:
_gst_mpegts_atsc_vct_free (vct);
return NULL;
}
/**
* gst_mpegts_section_get_atsc_tvct:
* @section: a #GstMpegTsSection of type %GST_MPEGTS_SECTION_ATSC_TVCT
*
* Returns the #GstMpegTsAtscVCT contained in the @section
*
* Returns: The #GstMpegTsAtscVCT contained in the section, or %NULL if an error
* happened.
*/
const GstMpegTsAtscVCT *
gst_mpegts_section_get_atsc_tvct (GstMpegTsSection * section)
{
g_return_val_if_fail (section->section_type == GST_MPEGTS_SECTION_ATSC_TVCT,
NULL);
g_return_val_if_fail (section->cached_parsed || section->data, NULL);
if (!section->cached_parsed)
section->cached_parsed =
__common_section_checks (section, 16, _parse_atsc_vct,
(GDestroyNotify) _gst_mpegts_atsc_vct_free);
return (const GstMpegTsAtscVCT *) section->cached_parsed;
}
/**
* gst_mpegts_section_get_atsc_cvct:
* @section: a #GstMpegTsSection of type %GST_MPEGTS_SECTION_ATSC_CVCT
*
* Returns the #GstMpegTsAtscVCT contained in the @section
*
* Returns: The #GstMpegTsAtscVCT contained in the section, or %NULL if an error
* happened.
*/
const GstMpegTsAtscVCT *
gst_mpegts_section_get_atsc_cvct (GstMpegTsSection * section)
{
g_return_val_if_fail (section->section_type == GST_MPEGTS_SECTION_ATSC_CVCT,
NULL);
g_return_val_if_fail (section->cached_parsed || section->data, NULL);
if (!section->cached_parsed)
section->cached_parsed =
__common_section_checks (section, 16, _parse_atsc_vct,
(GDestroyNotify) _gst_mpegts_atsc_vct_free);
return (const GstMpegTsAtscVCT *) section->cached_parsed;
}
/* MGT */
static GstMpegTsAtscMGTTable *
_gst_mpegts_atsc_mgt_table_copy (GstMpegTsAtscMGTTable * mgt_table)
{
GstMpegTsAtscMGTTable *copy;
copy = g_slice_dup (GstMpegTsAtscMGTTable, mgt_table);
copy->descriptors = g_ptr_array_ref (mgt_table->descriptors);
return copy;
}
static void
_gst_mpegts_atsc_mgt_table_free (GstMpegTsAtscMGTTable * mgt_table)
{
g_ptr_array_unref (mgt_table->descriptors);
g_slice_free (GstMpegTsAtscMGTTable, mgt_table);
}
G_DEFINE_BOXED_TYPE (GstMpegTsAtscMGTTable, gst_mpegts_atsc_mgt_table,
(GBoxedCopyFunc) _gst_mpegts_atsc_mgt_table_copy,
(GFreeFunc) _gst_mpegts_atsc_mgt_table_free);
static GstMpegTsAtscMGT *
_gst_mpegts_atsc_mgt_copy (GstMpegTsAtscMGT * mgt)
{
GstMpegTsAtscMGT *copy;
copy = g_slice_dup (GstMpegTsAtscMGT, mgt);
copy->tables = g_ptr_array_ref (mgt->tables);
copy->descriptors = g_ptr_array_ref (mgt->descriptors);
return copy;
}
static void
_gst_mpegts_atsc_mgt_free (GstMpegTsAtscMGT * mgt)
{
g_ptr_array_unref (mgt->tables);
g_ptr_array_unref (mgt->descriptors);
g_slice_free (GstMpegTsAtscMGT, mgt);
}
G_DEFINE_BOXED_TYPE (GstMpegTsAtscMGT, gst_mpegts_atsc_mgt,
(GBoxedCopyFunc) _gst_mpegts_atsc_mgt_copy,
(GFreeFunc) _gst_mpegts_atsc_mgt_free);
static gpointer
_parse_atsc_mgt (GstMpegTsSection * section)
{
GstMpegTsAtscMGT *mgt = NULL;
guint i = 0;
guint8 *data, *end;
guint16 descriptors_loop_length;
mgt = g_slice_new0 (GstMpegTsAtscMGT);
data = section->data;
end = data + section->section_length;
/* Skip already parsed data */
data += 8;
mgt->protocol_version = GST_READ_UINT8 (data);
data += 1;
mgt->tables_defined = GST_READ_UINT16_BE (data);
data += 2;
mgt->tables = g_ptr_array_new_full (mgt->tables_defined,
(GDestroyNotify) _gst_mpegts_atsc_mgt_table_free);
for (i = 0; i < mgt->tables_defined && data + 11 < end; i++) {
GstMpegTsAtscMGTTable *mgt_table;
if (data + 11 >= end) {
GST_WARNING ("MGT data too short to parse inner table num %d", i);
goto error;
}
mgt_table = g_slice_new0 (GstMpegTsAtscMGTTable);
g_ptr_array_add (mgt->tables, mgt_table);
mgt_table->table_type = GST_READ_UINT16_BE (data);
data += 2;
mgt_table->pid = GST_READ_UINT16_BE (data) & 0x1FFF;
data += 2;
mgt_table->version_number = GST_READ_UINT8 (data) & 0x1F;
data += 1;
mgt_table->number_bytes = GST_READ_UINT32_BE (data);
data += 4;
descriptors_loop_length = GST_READ_UINT16_BE (data) & 0x0FFF;
data += 2;
if (data + descriptors_loop_length >= end) {
GST_WARNING ("MGT data too short to parse inner table descriptors (table "
"num %d", i);
goto error;
}
mgt_table->descriptors =
gst_mpegts_parse_descriptors (data, descriptors_loop_length);
data += descriptors_loop_length;
}
descriptors_loop_length = GST_READ_UINT16_BE (data) & 0xFFF;
data += 2;
if (data + descriptors_loop_length >= end) {
GST_WARNING ("MGT data too short to parse descriptors");
goto error;
}
mgt->descriptors =
gst_mpegts_parse_descriptors (data, descriptors_loop_length);
data += descriptors_loop_length;
return (gpointer) mgt;
error:
_gst_mpegts_atsc_mgt_free (mgt);
return NULL;
}
/**
* gst_mpegts_section_get_atsc_mgt:
* @section: a #GstMpegTsSection of type %GST_MPEGTS_SECTION_ATSC_MGT
*
* Returns the #GstMpegTsAtscMGT contained in the @section.
*
* Returns: The #GstMpegTsAtscMGT contained in the section, or %NULL if an error
* happened.
*/
const GstMpegTsAtscMGT *
gst_mpegts_section_get_atsc_mgt (GstMpegTsSection * section)
{
g_return_val_if_fail (section->section_type == GST_MPEGTS_SECTION_ATSC_MGT,
NULL);
g_return_val_if_fail (section->cached_parsed || section->data, NULL);
if (!section->cached_parsed)
section->cached_parsed =
__common_section_checks (section, 17, _parse_atsc_mgt,
(GDestroyNotify) _gst_mpegts_atsc_mgt_free);
return (const GstMpegTsAtscMGT *) section->cached_parsed;
}
/* Multi string structure */
static GstMpegTsAtscStringSegment *
_gst_mpegts_atsc_string_segment_copy (GstMpegTsAtscStringSegment * seg)
{
GstMpegTsAtscStringSegment *copy;
copy = g_slice_dup (GstMpegTsAtscStringSegment, seg);
return copy;
}
static void
_gst_mpegts_atsc_string_segment_free (GstMpegTsAtscStringSegment * seg)
{
if (seg->cached_string)
g_free (seg->cached_string);
g_slice_free (GstMpegTsAtscStringSegment, seg);
}
static void
_gst_mpegts_atsc_string_segment_decode_string (GstMpegTsAtscStringSegment * seg)
{
const gchar *from_encoding;
g_return_if_fail (seg->cached_string == NULL);
if (seg->compression_type != 0) {
GST_FIXME ("Compressed strings not yet supported");
return;
}
/* FIXME add more encodings */
switch (seg->mode) {
case 0x3F:
from_encoding = "UTF-16BE";
break;
default:
from_encoding = NULL;
break;
}
if (from_encoding != NULL) {
GError *err = NULL;
seg->cached_string =
g_convert ((gchar *) seg->compressed_data,
(gssize) seg->compressed_data_size, "UTF-8", from_encoding, NULL, NULL,
&err);
if (err) {
GST_WARNING ("Failed to convert input string from codeset %s",
from_encoding);
g_error_free (err);
}
} else {
seg->cached_string =
g_strndup ((gchar *) seg->compressed_data, seg->compressed_data_size);
}
}
const gchar *
gst_mpegts_atsc_string_segment_get_string (GstMpegTsAtscStringSegment * seg)
{
if (!seg->cached_string)
_gst_mpegts_atsc_string_segment_decode_string (seg);
return seg->cached_string;
}
G_DEFINE_BOXED_TYPE (GstMpegTsAtscStringSegment, gst_mpegts_atsc_string_segment,
(GBoxedCopyFunc) _gst_mpegts_atsc_string_segment_copy,
(GFreeFunc) _gst_mpegts_atsc_string_segment_free);
static GstMpegTsAtscMultString *
_gst_mpegts_atsc_mult_string_copy (GstMpegTsAtscMultString * mstring)
{
GstMpegTsAtscMultString *copy;
copy = g_slice_dup (GstMpegTsAtscMultString, mstring);
copy->segments = g_ptr_array_ref (mstring->segments);
return copy;
}
static void
_gst_mpegts_atsc_mult_string_free (GstMpegTsAtscMultString * mstring)
{
g_ptr_array_unref (mstring->segments);
g_slice_free (GstMpegTsAtscMultString, mstring);
}
G_DEFINE_BOXED_TYPE (GstMpegTsAtscMultString, gst_mpegts_atsc_mult_string,
(GBoxedCopyFunc) _gst_mpegts_atsc_mult_string_copy,
(GFreeFunc) _gst_mpegts_atsc_mult_string_free);
static GPtrArray *
_parse_atsc_mult_string (guint8 * data, guint datasize)
{
guint8 num_strings;
GPtrArray *res = NULL;
guint8 *end = data + datasize;
gint i;
if (datasize > 0) {
/* 1 is the minimum entry size, so no need to check here */
num_strings = GST_READ_UINT8 (data);
data += 1;
res =
g_ptr_array_new_full (num_strings,
(GDestroyNotify) _gst_mpegts_atsc_mult_string_free);
for (i = 0; i < num_strings; i++) {
GstMpegTsAtscMultString *mstring;
guint8 num_segments;
gint j;
mstring = g_slice_new0 (GstMpegTsAtscMultString);
g_ptr_array_add (res, mstring);
mstring->segments =
g_ptr_array_new_full (num_strings,
(GDestroyNotify) _gst_mpegts_atsc_string_segment_free);
/* each entry needs at least 4 bytes (lang code and segments number) */
if (end - data < 4) {
GST_WARNING ("Data too short for multstring parsing %d",
(gint) (end - data));
goto error;
}
mstring->iso_639_langcode[0] = GST_READ_UINT8 (data);
data += 1;
mstring->iso_639_langcode[1] = GST_READ_UINT8 (data);
data += 1;
mstring->iso_639_langcode[2] = GST_READ_UINT8 (data);
data += 1;
num_segments = GST_READ_UINT8 (data);
data += 1;
for (j = 0; j < num_segments; j++) {
GstMpegTsAtscStringSegment *seg;
seg = g_slice_new0 (GstMpegTsAtscStringSegment);
g_ptr_array_add (mstring->segments, seg);
/* each entry needs at least 3 bytes */
if (end - data < 3) {
GST_WARNING ("Data too short for multstring parsing %d", datasize);
goto error;
}
seg->compression_type = GST_READ_UINT8 (data);
data += 1;
seg->mode = GST_READ_UINT8 (data);
data += 1;
seg->compressed_data_size = GST_READ_UINT8 (data);
data += 1;
if (end - data < seg->compressed_data_size) {
GST_WARNING ("Data too short for multstring parsing %d", datasize);
goto error;
}
if (seg->compressed_data_size)
seg->compressed_data = data;
data += seg->compressed_data_size;
}
}
}
return res;
error:
if (res)
g_ptr_array_unref (res);
return NULL;
}
/* EIT */
static GstMpegTsAtscEITEvent *
_gst_mpegts_atsc_eit_event_copy (GstMpegTsAtscEITEvent * event)
{
GstMpegTsAtscEITEvent *copy;
copy = g_slice_dup (GstMpegTsAtscEITEvent, event);
copy->titles = g_ptr_array_ref (event->titles);
copy->descriptors = g_ptr_array_ref (event->descriptors);
return copy;
}
static void
_gst_mpegts_atsc_eit_event_free (GstMpegTsAtscEITEvent * event)
{
if (event->titles)
g_ptr_array_unref (event->titles);
if (event->descriptors)
g_ptr_array_unref (event->descriptors);
g_slice_free (GstMpegTsAtscEITEvent, event);
}
G_DEFINE_BOXED_TYPE (GstMpegTsAtscEITEvent, gst_mpegts_atsc_eit_event,
(GBoxedCopyFunc) _gst_mpegts_atsc_eit_event_copy,
(GFreeFunc) _gst_mpegts_atsc_eit_event_free);
static GstMpegTsAtscEIT *
_gst_mpegts_atsc_eit_copy (GstMpegTsAtscEIT * eit)
{
GstMpegTsAtscEIT *copy;
copy = g_slice_dup (GstMpegTsAtscEIT, eit);
copy->events = g_ptr_array_ref (eit->events);
return copy;
}
static void
_gst_mpegts_atsc_eit_free (GstMpegTsAtscEIT * eit)
{
if (eit->events)
g_ptr_array_unref (eit->events);
g_slice_free (GstMpegTsAtscEIT, eit);
}
G_DEFINE_BOXED_TYPE (GstMpegTsAtscEIT, gst_mpegts_atsc_eit,
(GBoxedCopyFunc) _gst_mpegts_atsc_eit_copy,
(GFreeFunc) _gst_mpegts_atsc_eit_free);
static gpointer
_parse_atsc_eit (GstMpegTsSection * section)
{
GstMpegTsAtscEIT *eit = NULL;
guint i = 0;
guint8 *data, *end;
guint8 num_events;
eit = g_slice_new0 (GstMpegTsAtscEIT);
data = section->data;
end = data + section->section_length;
eit->source_id = section->subtable_extension;
/* Skip already parsed data */
data += 8;
eit->protocol_version = GST_READ_UINT8 (data);
data += 1;
num_events = GST_READ_UINT8 (data);
data += 1;
eit->events = g_ptr_array_new_with_free_func ((GDestroyNotify)
_gst_mpegts_atsc_eit_event_free);
for (i = 0; i < num_events; i++) {
GstMpegTsAtscEITEvent *event;
guint32 tmp;
guint8 text_length;
guint16 descriptors_loop_length;
if (end - data < 12) {
GST_WARNING ("PID %d invalid EIT entry length %d with %u events",
section->pid, (gint) (end - 4 - data), num_events);
goto error;
}
event = g_slice_new0 (GstMpegTsAtscEITEvent);
g_ptr_array_add (eit->events, event);
event->event_id = GST_READ_UINT16_BE (data) & 0x3FFF;
data += 2;
event->start_time = GST_READ_UINT32_BE (data);
data += 4;
tmp = GST_READ_UINT32_BE (data);
data += 4;
event->etm_location = (tmp >> 28) & 0x3;
event->length_in_seconds = (tmp >> 8) & 0x0FFFFF;
text_length = tmp & 0xFF;
if (text_length > end - data - 4 - 2) {
GST_WARNING ("PID %d invalid EIT entry length %d with %u events",
section->pid, (gint) (end - 4 - data), num_events);
goto error;
}
event->titles = _parse_atsc_mult_string (data, text_length);
data += text_length;
descriptors_loop_length = GST_READ_UINT16_BE (data) & 0x0FFF;
data += 2;
if (end - data - 4 < descriptors_loop_length) {
GST_WARNING ("PID %d invalid EIT entry length %d with %u events",
section->pid, (gint) (end - 4 - data), num_events);
goto error;
}
event->descriptors =
gst_mpegts_parse_descriptors (data, descriptors_loop_length);
data += descriptors_loop_length;
}
if (data != end - 4) {
GST_WARNING ("PID %d invalid EIT parsed %d length %d",
section->pid, (gint) (data - section->data), section->section_length);
goto error;
}
return (gpointer) eit;
error:
_gst_mpegts_atsc_eit_free (eit);
return NULL;
}
/**
* gst_mpegts_section_get_atsc_eit:
* @section: a #GstMpegTsSection of type %GST_MPEGTS_SECTION_ATSC_EIT
*
* Returns the #GstMpegTsAtscEIT contained in the @section.
*
* Returns: The #GstMpegTsAtscEIT contained in the section, or %NULL if an error
* happened.
*/
const GstMpegTsAtscEIT *
gst_mpegts_section_get_atsc_eit (GstMpegTsSection * section)
{
g_return_val_if_fail (section->section_type == GST_MPEGTS_SECTION_ATSC_EIT,
NULL);
g_return_val_if_fail (section->cached_parsed || section->data, NULL);
if (!section->cached_parsed)
section->cached_parsed =
__common_section_checks (section, 14, _parse_atsc_eit,
(GDestroyNotify) _gst_mpegts_atsc_eit_free);
return (const GstMpegTsAtscEIT *) section->cached_parsed;
}
static GstMpegTsAtscETT *
_gst_mpegts_atsc_ett_copy (GstMpegTsAtscETT * ett)
{
GstMpegTsAtscETT *copy;
copy = g_slice_dup (GstMpegTsAtscETT, ett);
copy->messages = g_ptr_array_ref (ett->messages);
return copy;
}
static void
_gst_mpegts_atsc_ett_free (GstMpegTsAtscETT * ett)
{
if (ett->messages)
g_ptr_array_unref (ett->messages);
g_slice_free (GstMpegTsAtscETT, ett);
}
G_DEFINE_BOXED_TYPE (GstMpegTsAtscETT, gst_mpegts_atsc_ett,
(GBoxedCopyFunc) _gst_mpegts_atsc_ett_copy,
(GFreeFunc) _gst_mpegts_atsc_ett_free);
static gpointer
_parse_ett (GstMpegTsSection * section)
{
GstMpegTsAtscETT *ett = NULL;
guint8 *data, *end;
ett = g_slice_new0 (GstMpegTsAtscETT);
data = section->data;
end = data + section->section_length;
ett->ett_table_id_extension = section->subtable_extension;
/* Skip already parsed data */
data += 8;
ett->protocol_version = GST_READ_UINT8 (data);
data += 1;
ett->etm_id = GST_READ_UINT32_BE (data);
data += 4;
ett->messages = _parse_atsc_mult_string (data, end - data - 4);
data += end - data - 4;
if (data != end - 4) {
GST_WARNING ("PID %d invalid ETT parsed %d length %d",
section->pid, (gint) (data - section->data), section->section_length);
goto error;
}
return (gpointer) ett;
error:
_gst_mpegts_atsc_ett_free (ett);
return NULL;
}
/**
* gst_mpegts_section_get_atsc_ett:
* @section: a #GstMpegTsSection of type %GST_MPEGTS_SECTION_ATSC_ETT
*
* Returns the #GstMpegTsAtscETT contained in the @section.
*
* Returns: The #GstMpegTsAtscETT contained in the section, or %NULL if an error
* happened.
*/
const GstMpegTsAtscETT *
gst_mpegts_section_get_atsc_ett (GstMpegTsSection * section)
{
g_return_val_if_fail (section->section_type == GST_MPEGTS_SECTION_ATSC_ETT,
NULL);
g_return_val_if_fail (section->cached_parsed || section->data, NULL);
if (!section->cached_parsed)
section->cached_parsed = __common_section_checks (section, 17, _parse_ett,
(GDestroyNotify) _gst_mpegts_atsc_ett_free);
return (const GstMpegTsAtscETT *) section->cached_parsed;
}
/* STT */
static GstMpegTsAtscSTT *
_gst_mpegts_atsc_stt_copy (GstMpegTsAtscSTT * stt)
{
GstMpegTsAtscSTT *copy;
copy = g_slice_dup (GstMpegTsAtscSTT, stt);
copy->descriptors = g_ptr_array_ref (stt->descriptors);
return copy;
}
static void
_gst_mpegts_atsc_stt_free (GstMpegTsAtscSTT * stt)
{
if (stt->descriptors)
g_ptr_array_unref (stt->descriptors);
g_slice_free (GstMpegTsAtscSTT, stt);
}
G_DEFINE_BOXED_TYPE (GstMpegTsAtscSTT, gst_mpegts_atsc_stt,
(GBoxedCopyFunc) _gst_mpegts_atsc_stt_copy,
(GFreeFunc) _gst_mpegts_atsc_stt_free);
static gpointer
_parse_atsc_stt (GstMpegTsSection * section)
{
GstMpegTsAtscSTT *stt = NULL;
guint8 *data, *end;
guint16 daylight_saving;
stt = g_slice_new0 (GstMpegTsAtscSTT);
data = section->data;
end = data + section->section_length;
/* Skip already parsed data */
data += 8;
stt->protocol_version = GST_READ_UINT8 (data);
data += 1;
stt->system_time = GST_READ_UINT32_BE (data);
data += 4;
stt->gps_utc_offset = GST_READ_UINT8 (data);
data += 1;
daylight_saving = GST_READ_UINT16_BE (data);
data += 2;
stt->ds_status = daylight_saving >> 15;
stt->ds_dayofmonth = (daylight_saving >> 8) & 0x1F;
stt->ds_hour = daylight_saving & 0xFF;
stt->descriptors = gst_mpegts_parse_descriptors (data, end - data - 4);
if (stt->descriptors == NULL)
goto error;
return (gpointer) stt;
error:
_gst_mpegts_atsc_stt_free (stt);
return NULL;
}
/**
* gst_mpegts_section_get_atsc_stt:
* @section: a #GstMpegTsSection of type %GST_MPEGTS_SECTION_ATSC_STT
*
* Returns the #GstMpegTsAtscSTT contained in the @section.
*
* Returns: The #GstMpegTsAtscSTT contained in the section, or %NULL if an error
* happened.
*/
const GstMpegTsAtscSTT *
gst_mpegts_section_get_atsc_stt (GstMpegTsSection * section)
{
g_return_val_if_fail (section->section_type == GST_MPEGTS_SECTION_ATSC_STT,
NULL);
g_return_val_if_fail (section->cached_parsed || section->data, NULL);
if (!section->cached_parsed)
section->cached_parsed =
__common_section_checks (section, 20, _parse_atsc_stt,
(GDestroyNotify) _gst_mpegts_atsc_stt_free);
return (const GstMpegTsAtscSTT *) section->cached_parsed;
}
#define GPS_TO_UTC_TICKS G_GINT64_CONSTANT(315964800)
static GstDateTime *
_gst_mpegts_atsc_gps_time_to_datetime (guint32 systemtime, guint8 gps_offset)
{
return gst_date_time_new_from_unix_epoch_utc (systemtime - gps_offset +
GPS_TO_UTC_TICKS);
}
GstDateTime *
gst_mpegts_atsc_stt_get_datetime_utc (GstMpegTsAtscSTT * stt)
{
if (stt->utc_datetime == NULL)
stt->utc_datetime = _gst_mpegts_atsc_gps_time_to_datetime (stt->system_time,
stt->gps_utc_offset);
if (stt->utc_datetime)
return gst_date_time_ref (stt->utc_datetime);
return NULL;
}