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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 int mpeg_parse_packet(AVFormatContext *ctx, PayloadContext *data,
  27.                              AVStream *st, AVPacket *pkt, uint32_t *timestamp,
  28.                              const uint8_t *buf, int len, uint16_t seq,
  29.                              int flags)
  30. {
  31.     unsigned int h;
  32.     if (len <= 4)
  33.         return AVERROR_INVALIDDATA;
  34.     h    = AV_RB32(buf);
  35.     buf += 4;
  36.     len -= 4;
  37.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && h & (1 << 26)) {
  38.         /* MPEG-2 */
  39.         if (len <= 4)
  40.             return AVERROR_INVALIDDATA;
  41.         buf += 4;
  42.         len -= 4;
  43.     }
  44.     if (av_new_packet(pkt, len) < 0)
  45.         return AVERROR(ENOMEM);
  46.     memcpy(pkt->data, buf, len);
  47.     pkt->stream_index = st->index;
  48.     return 0;
  49. }
  50.  
  51. RTPDynamicProtocolHandler ff_mpeg_audio_dynamic_handler = {
  52.     .codec_type        = AVMEDIA_TYPE_AUDIO,
  53.     .codec_id          = AV_CODEC_ID_MP3,
  54.     .need_parsing      = AVSTREAM_PARSE_FULL,
  55.     .parse_packet      = mpeg_parse_packet,
  56.     .static_payload_id = 14,
  57. };
  58.  
  59. RTPDynamicProtocolHandler ff_mpeg_video_dynamic_handler = {
  60.     .codec_type        = AVMEDIA_TYPE_VIDEO,
  61.     .codec_id          = AV_CODEC_ID_MPEG2VIDEO,
  62.     .need_parsing      = AVSTREAM_PARSE_FULL,
  63.     .parse_packet      = mpeg_parse_packet,
  64.     .static_payload_id = 32,
  65. };
  66.