/*
  * Common code for the RTP depacketization of MPEG-1/2 formats.
  * Copyright (c) 2002 Fabrice Bellard
  *

  * This file is part of FFmpeg.

  *

  * FFmpeg is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *

  * FFmpeg 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
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public

  * License along with FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 

 #include "libavutil/attributes.h"

 #include "libavutil/intreadwrite.h"

 #include "rtpdec_formats.h"

 static av_cold int mpeg_init(AVFormatContext *ctx, int st_index, PayloadContext *data)

 {
     if (st_index < 0)
         return 0;
     ctx->streams[st_index]->need_parsing = AVSTREAM_PARSE_FULL;
     return 0;
 }
 

 static int mpeg_parse_packet(AVFormatContext *ctx, PayloadContext *data,
                              AVStream *st, AVPacket *pkt, uint32_t *timestamp,
                              const uint8_t *buf, int len, uint16_t seq,
                              int flags)
 {
     unsigned int h;
     if (len <= 4)
         return AVERROR_INVALIDDATA;
     h    = AV_RB32(buf);
     buf += 4;
     len -= 4;
     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && h & (1 << 26)) {
         /* MPEG-2 */
         if (len <= 4)
             return AVERROR_INVALIDDATA;
         buf += 4;
         len -= 4;
     }
     if (av_new_packet(pkt, len) < 0)
         return AVERROR(ENOMEM);
     memcpy(pkt->data, buf, len);
     pkt->stream_index = st->index;
     return 0;
 }
 
 RTPDynamicProtocolHandler ff_mpeg_audio_dynamic_handler = {
     .codec_type        = AVMEDIA_TYPE_AUDIO,
     .codec_id          = AV_CODEC_ID_MP3,

     .init              = mpeg_init,

     .parse_packet      = mpeg_parse_packet,
     .static_payload_id = 14,
 };
 
 RTPDynamicProtocolHandler ff_mpeg_video_dynamic_handler = {
     .codec_type        = AVMEDIA_TYPE_VIDEO,
     .codec_id          = AV_CODEC_ID_MPEG2VIDEO,

     .init              = mpeg_init,

     .parse_packet      = mpeg_parse_packet,
     .static_payload_id = 32,
 };