/src/ffmpeg/libavformat/rtpdec_mpeg12.c
Line | Count | Source |
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 | 0 | { |
31 | 0 | unsigned int h; |
32 | 0 | int ret; |
33 | 0 | if (len <= 4) |
34 | 0 | return AVERROR_INVALIDDATA; |
35 | 0 | h = AV_RB32(buf); |
36 | 0 | buf += 4; |
37 | 0 | len -= 4; |
38 | 0 | if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && h & (1 << 26)) { |
39 | | /* MPEG-2 */ |
40 | 0 | if (len <= 4) |
41 | 0 | return AVERROR_INVALIDDATA; |
42 | 0 | buf += 4; |
43 | 0 | len -= 4; |
44 | 0 | } |
45 | 0 | if ((ret = av_new_packet(pkt, len)) < 0) |
46 | 0 | return ret; |
47 | 0 | memcpy(pkt->data, buf, len); |
48 | 0 | pkt->stream_index = st->index; |
49 | 0 | return 0; |
50 | 0 | } |
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 | | }; |