| /* GStreamer |
| * Copyright (C) <2005> Wim Taymans <wim.taymans@gmail.com> |
| * |
| * 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 <string.h> |
| |
| #include <gst/rtp/gstrtpbuffer.h> |
| #include <gst/video/video.h> |
| #include "gstrtph263pdepay.h" |
| #include "gstrtputils.h" |
| |
| GST_DEBUG_CATEGORY_STATIC (rtph263pdepay_debug); |
| #define GST_CAT_DEFAULT (rtph263pdepay_debug) |
| |
| static GstStaticPadTemplate gst_rtp_h263p_depay_src_template = |
| GST_STATIC_PAD_TEMPLATE ("src", |
| GST_PAD_SRC, |
| GST_PAD_ALWAYS, |
| GST_STATIC_CAPS ("video/x-h263, " "variant = (string) \"itu\" ") |
| ); |
| |
| static GstStaticPadTemplate gst_rtp_h263p_depay_sink_template = |
| GST_STATIC_PAD_TEMPLATE ("sink", |
| GST_PAD_SINK, |
| GST_PAD_ALWAYS, |
| GST_STATIC_CAPS ("application/x-rtp, " |
| "media = (string) \"video\", " |
| "clock-rate = (int) [1, MAX], " |
| "encoding-name = (string) \"H263-1998\"; " |
| /* optional params */ |
| /* NOTE all optional SDP params must be strings in the caps */ |
| /* |
| "sqcif = (string) [1, 32], " |
| "qcif = (string) [1, 32], " |
| "cif = (string) [1, 32], " |
| "cif4 = (string) [1, 32], " |
| "cif16 = (string) [1, 32], " |
| "custom = (string) ANY, " |
| "f = (string) {0, 1}," |
| "i = (string) {0, 1}," |
| "j = (string) {0, 1}," |
| "t = (string) {0, 1}," |
| "k = (string) {1, 2, 3, 4}," |
| "n = (string) {1, 2, 3, 4}," |
| "p = (string) ANY," |
| "par = (string) ANY, " |
| "cpcf = (string) ANY, " |
| "bpp = (string) [0, 65536], " |
| "hrd = (string) {0, 1}; " |
| */ |
| "application/x-rtp, " |
| "media = (string) \"video\", " |
| "clock-rate = (int) [1, MAX], " |
| "encoding-name = (string) \"H263-2000\" " |
| /* optional params */ |
| /* NOTE all optional SDP params must be strings in the caps */ |
| /* |
| "profile = (string) [0, 10], " |
| "level = (string) {10, 20, 30, 40, 45, 50, 60, 70}, " |
| "interlace = (string) {0, 1};" |
| */ |
| ) |
| ); |
| |
| #define gst_rtp_h263p_depay_parent_class parent_class |
| G_DEFINE_TYPE (GstRtpH263PDepay, gst_rtp_h263p_depay, |
| GST_TYPE_RTP_BASE_DEPAYLOAD); |
| |
| static void gst_rtp_h263p_depay_finalize (GObject * object); |
| |
| static GstStateChangeReturn gst_rtp_h263p_depay_change_state (GstElement * |
| element, GstStateChange transition); |
| |
| static GstBuffer *gst_rtp_h263p_depay_process (GstRTPBaseDepayload * depayload, |
| GstRTPBuffer * rtp); |
| gboolean gst_rtp_h263p_depay_setcaps (GstRTPBaseDepayload * filter, |
| GstCaps * caps); |
| |
| static void |
| gst_rtp_h263p_depay_class_init (GstRtpH263PDepayClass * klass) |
| { |
| GObjectClass *gobject_class; |
| GstElementClass *gstelement_class; |
| GstRTPBaseDepayloadClass *gstrtpbasedepayload_class; |
| |
| gobject_class = (GObjectClass *) klass; |
| gstelement_class = (GstElementClass *) klass; |
| gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass; |
| |
| gobject_class->finalize = gst_rtp_h263p_depay_finalize; |
| |
| gstelement_class->change_state = gst_rtp_h263p_depay_change_state; |
| |
| gst_element_class_add_static_pad_template (gstelement_class, |
| &gst_rtp_h263p_depay_src_template); |
| gst_element_class_add_static_pad_template (gstelement_class, |
| &gst_rtp_h263p_depay_sink_template); |
| |
| gst_element_class_set_static_metadata (gstelement_class, |
| "RTP H263 depayloader", "Codec/Depayloader/Network/RTP", |
| "Extracts H263/+/++ video from RTP packets (RFC 4629)", |
| "Wim Taymans <wim.taymans@gmail.com>"); |
| |
| gstrtpbasedepayload_class->process_rtp_packet = gst_rtp_h263p_depay_process; |
| gstrtpbasedepayload_class->set_caps = gst_rtp_h263p_depay_setcaps; |
| |
| GST_DEBUG_CATEGORY_INIT (rtph263pdepay_debug, "rtph263pdepay", 0, |
| "H263+ Video RTP Depayloader"); |
| } |
| |
| static void |
| gst_rtp_h263p_depay_init (GstRtpH263PDepay * rtph263pdepay) |
| { |
| rtph263pdepay->adapter = gst_adapter_new (); |
| } |
| |
| static void |
| gst_rtp_h263p_depay_finalize (GObject * object) |
| { |
| GstRtpH263PDepay *rtph263pdepay; |
| |
| rtph263pdepay = GST_RTP_H263P_DEPAY (object); |
| |
| g_object_unref (rtph263pdepay->adapter); |
| rtph263pdepay->adapter = NULL; |
| |
| G_OBJECT_CLASS (parent_class)->finalize (object); |
| } |
| |
| gboolean |
| gst_rtp_h263p_depay_setcaps (GstRTPBaseDepayload * filter, GstCaps * caps) |
| { |
| GstCaps *srccaps = NULL; |
| GstStructure *structure = gst_caps_get_structure (caps, 0); |
| gint clock_rate; |
| const gchar *encoding_name = NULL; |
| gboolean res; |
| |
| if (!gst_structure_get_int (structure, "clock-rate", &clock_rate)) |
| clock_rate = 90000; /* default */ |
| filter->clock_rate = clock_rate; |
| |
| encoding_name = gst_structure_get_string (structure, "encoding-name"); |
| if (encoding_name == NULL) |
| goto no_encoding_name; |
| |
| if (g_ascii_strcasecmp (encoding_name, "H263-2000") == 0) { |
| /* always h263++ */ |
| srccaps = gst_caps_new_simple ("video/x-h263", |
| "variant", G_TYPE_STRING, "itu", |
| "h263version", G_TYPE_STRING, "h263pp", NULL); |
| } else if (g_ascii_strcasecmp (encoding_name, "H263-1998") == 0) { |
| /* this can be H263 or H263+ depending on defined appendixes in the optional |
| * SDP params */ |
| const gchar *F, *I, *J, *T, *K, *N, *P; |
| gboolean is_h263p = FALSE; |
| |
| F = gst_structure_get_string (structure, "f"); |
| if (F) |
| if (g_ascii_strcasecmp (F, "1") == 0) |
| is_h263p = TRUE; |
| I = gst_structure_get_string (structure, "i"); |
| if (I) |
| if (g_ascii_strcasecmp (I, "1") == 0) |
| is_h263p = TRUE; |
| J = gst_structure_get_string (structure, "j"); |
| if (J) |
| if (g_ascii_strcasecmp (J, "1") == 0) |
| is_h263p = TRUE; |
| T = gst_structure_get_string (structure, "t"); |
| if (T) |
| if (g_ascii_strcasecmp (T, "1") == 0) |
| is_h263p = TRUE; |
| K = gst_structure_get_string (structure, "k"); |
| if (K) |
| is_h263p = TRUE; |
| N = gst_structure_get_string (structure, "n"); |
| if (N) |
| is_h263p = TRUE; |
| P = gst_structure_get_string (structure, "p"); |
| if (P) |
| is_h263p = TRUE; |
| |
| if (is_h263p) { |
| srccaps = gst_caps_new_simple ("video/x-h263", |
| "variant", G_TYPE_STRING, "itu", |
| "h263version", G_TYPE_STRING, "h263p", NULL); |
| } else { |
| srccaps = gst_caps_new_simple ("video/x-h263", |
| "variant", G_TYPE_STRING, "itu", |
| "h263version", G_TYPE_STRING, "h263", NULL); |
| } |
| } |
| if (!srccaps) |
| goto no_caps; |
| |
| res = gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (filter), srccaps); |
| gst_caps_unref (srccaps); |
| |
| return res; |
| |
| /* ERRORS */ |
| no_encoding_name: |
| { |
| GST_ERROR_OBJECT (filter, "no encoding-name"); |
| return FALSE; |
| } |
| no_caps: |
| { |
| GST_ERROR_OBJECT (filter, "invalid encoding-name"); |
| return FALSE; |
| } |
| } |
| |
| static GstBuffer * |
| gst_rtp_h263p_depay_process (GstRTPBaseDepayload * depayload, |
| GstRTPBuffer * rtp) |
| { |
| GstRtpH263PDepay *rtph263pdepay; |
| GstBuffer *outbuf; |
| gint payload_len; |
| guint8 *payload; |
| gboolean P, V, M; |
| guint header_len; |
| guint8 PLEN, PEBIT; |
| |
| rtph263pdepay = GST_RTP_H263P_DEPAY (depayload); |
| |
| /* flush remaining data on discont */ |
| if (GST_BUFFER_IS_DISCONT (rtp->buffer)) { |
| GST_LOG_OBJECT (depayload, "DISCONT, flushing adapter"); |
| gst_adapter_clear (rtph263pdepay->adapter); |
| rtph263pdepay->wait_start = TRUE; |
| } |
| |
| payload_len = gst_rtp_buffer_get_payload_len (rtp); |
| header_len = 2; |
| |
| if (payload_len < header_len) |
| goto too_small; |
| |
| payload = gst_rtp_buffer_get_payload (rtp); |
| |
| M = gst_rtp_buffer_get_marker (rtp); |
| |
| /* 0 1 |
| * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | RR |P|V| PLEN |PEBIT| |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| */ |
| P = (payload[0] & 0x04) == 0x04; |
| V = (payload[0] & 0x02) == 0x02; |
| PLEN = ((payload[0] & 0x1) << 5) | (payload[1] >> 3); |
| PEBIT = payload[1] & 0x7; |
| |
| GST_LOG_OBJECT (depayload, "P %d, V %d, PLEN %d, PEBIT %d", P, V, PLEN, |
| PEBIT); |
| |
| if (V) { |
| header_len++; |
| } |
| if (PLEN) { |
| header_len += PLEN; |
| } |
| |
| if ((!P && payload_len < header_len) || (P && payload_len < header_len - 2)) |
| goto too_small; |
| |
| if (P) { |
| rtph263pdepay->wait_start = FALSE; |
| header_len -= 2; |
| } |
| |
| if (rtph263pdepay->wait_start) |
| goto waiting_start; |
| |
| if (payload_len < header_len) |
| goto too_small; |
| |
| /* FIXME do not ignore the VRC header (See RFC 2429 section 4.2) */ |
| /* FIXME actually use the RTP picture header when it is lost in the network */ |
| /* for now strip off header */ |
| payload_len -= header_len; |
| |
| if (M) { |
| /* frame is completed: append to previous, push it out */ |
| guint len, padlen; |
| guint avail; |
| GstBuffer *padbuf; |
| |
| GST_LOG_OBJECT (depayload, "Frame complete"); |
| |
| outbuf = |
| gst_rtp_buffer_get_payload_subbuffer (rtp, header_len, payload_len); |
| if (P) |
| gst_buffer_memset (outbuf, 0, 0, 2); |
| gst_adapter_push (rtph263pdepay->adapter, outbuf); |
| outbuf = NULL; |
| |
| avail = gst_adapter_available (rtph263pdepay->adapter); |
| len = avail + payload_len; |
| padlen = (len % 4) + 4; |
| |
| if (avail == 0) |
| goto empty_frame; |
| |
| outbuf = gst_adapter_take_buffer (rtph263pdepay->adapter, avail); |
| if (padlen) { |
| padbuf = gst_buffer_new_and_alloc (padlen); |
| gst_buffer_memset (padbuf, 0, 0, padlen); |
| outbuf = gst_buffer_append (outbuf, padbuf); |
| } |
| |
| gst_rtp_drop_non_video_meta (rtph263pdepay, outbuf); |
| |
| return outbuf; |
| } else { |
| /* frame not completed: store in adapter */ |
| GST_LOG_OBJECT (depayload, "Frame incomplete, storing %d", payload_len); |
| |
| outbuf = |
| gst_rtp_buffer_get_payload_subbuffer (rtp, header_len, payload_len); |
| if (P) |
| gst_buffer_memset (outbuf, 0, 0, 2); |
| gst_adapter_push (rtph263pdepay->adapter, outbuf); |
| } |
| return NULL; |
| |
| too_small: |
| { |
| GST_ELEMENT_WARNING (rtph263pdepay, STREAM, DECODE, |
| ("Packet payload was too small"), (NULL)); |
| return NULL; |
| } |
| waiting_start: |
| { |
| GST_DEBUG_OBJECT (rtph263pdepay, "waiting for picture start"); |
| return NULL; |
| } |
| empty_frame: |
| { |
| GST_WARNING_OBJECT (rtph263pdepay, "Depayloaded frame is empty, dropping"); |
| return NULL; |
| } |
| } |
| |
| static GstStateChangeReturn |
| gst_rtp_h263p_depay_change_state (GstElement * element, |
| GstStateChange transition) |
| { |
| GstRtpH263PDepay *rtph263pdepay; |
| GstStateChangeReturn ret; |
| |
| rtph263pdepay = GST_RTP_H263P_DEPAY (element); |
| |
| switch (transition) { |
| case GST_STATE_CHANGE_NULL_TO_READY: |
| break; |
| case GST_STATE_CHANGE_READY_TO_PAUSED: |
| gst_adapter_clear (rtph263pdepay->adapter); |
| rtph263pdepay->wait_start = TRUE; |
| break; |
| default: |
| break; |
| } |
| |
| ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); |
| |
| switch (transition) { |
| case GST_STATE_CHANGE_READY_TO_NULL: |
| break; |
| default: |
| break; |
| } |
| return ret; |
| } |
| |
| gboolean |
| gst_rtp_h263p_depay_plugin_init (GstPlugin * plugin) |
| { |
| return gst_element_register (plugin, "rtph263pdepay", |
| GST_RANK_SECONDARY, GST_TYPE_RTP_H263P_DEPAY); |
| } |