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  1. /*
  2.  * Common code for the RTP depacketization of MPEG-1/2 formats.
  3.  * Copyright (c) 2002 Fabrice Bellard
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include "libavutil/attributes.h"
  23. #include "libavutil/intreadwrite.h"
  24. #include "rtpdec_formats.h"
  25.  
  26. static av_cold int mpeg_init(AVFormatContext *ctx, int st_index, PayloadContext *data)
  27. {
  28.     if (st_index < 0)
  29.         return 0;
  30.     ctx->streams[st_index]->need_parsing = AVSTREAM_PARSE_FULL;
  31.     return 0;
  32. }
  33.  
  34. static int mpeg_parse_packet(AVFormatContext *ctx, PayloadContext *data,
  35.                              AVStream *st, AVPacket *pkt, uint32_t *timestamp,
  36.                              const uint8_t *buf, int len, uint16_t seq,
  37.                              int flags)
  38. {
  39.     unsigned int h;
  40.     if (len <= 4)
  41.         return AVERROR_INVALIDDATA;
  42.     h    = AV_RB32(buf);
  43.     buf += 4;
  44.     len -= 4;
  45.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && h & (1 << 26)) {
  46.         /* MPEG-2 */
  47.         if (len <= 4)
  48.             return AVERROR_INVALIDDATA;
  49.         buf += 4;
  50.         len -= 4;
  51.     }
  52.     if (av_new_packet(pkt, len) < 0)
  53.         return AVERROR(ENOMEM);
  54.     memcpy(pkt->data, buf, len);
  55.     pkt->stream_index = st->index;
  56.     return 0;
  57. }
  58.  
  59. RTPDynamicProtocolHandler ff_mpeg_audio_dynamic_handler = {
  60.     .codec_type        = AVMEDIA_TYPE_AUDIO,
  61.     .codec_id          = AV_CODEC_ID_MP3,
  62.     .init              = mpeg_init,
  63.     .parse_packet      = mpeg_parse_packet,
  64.     .static_payload_id = 14,
  65. };
  66.  
  67. RTPDynamicProtocolHandler ff_mpeg_video_dynamic_handler = {
  68.     .codec_type        = AVMEDIA_TYPE_VIDEO,
  69.     .codec_id          = AV_CODEC_ID_MPEG2VIDEO,
  70.     .init              = mpeg_init,
  71.     .parse_packet      = mpeg_parse_packet,
  72.     .static_payload_id = 32,
  73. };
  74.