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
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)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 int ret;
33 if (len <= 4)
34 return AVERROR_INVALIDDATA;
35 h = AV_RB32(buf);
36 buf += 4;
37 len -= 4;
38 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && h & (1 << 26)) {
39 /* MPEG-2 */
40 if (len <= 4)
41 return AVERROR_INVALIDDATA;
42 buf += 4;
43 len -= 4;
44 }
45 if ((ret = av_new_packet(pkt, len)) < 0)
46 return ret;
47 memcpy(pkt->data, buf, len);
48 pkt->stream_index = st->index;
49 return 0;
50 }
51
52 const RTPDynamicProtocolHandler ff_mpeg_audio_dynamic_handler = {
53 .codec_type = AVMEDIA_TYPE_AUDIO,
54 .codec_id = AV_CODEC_ID_MP3,
55 .need_parsing = AVSTREAM_PARSE_FULL,
56 .parse_packet = mpeg_parse_packet,
57 .static_payload_id = 14,
58 };
59
60 const RTPDynamicProtocolHandler ff_mpeg_video_dynamic_handler = {
61 .codec_type = AVMEDIA_TYPE_VIDEO,
62 .codec_id = AV_CODEC_ID_MPEG2VIDEO,
63 .need_parsing = AVSTREAM_PARSE_FULL,
64 .parse_packet = mpeg_parse_packet,
65 .static_payload_id = 32,
66 };
67