Commit | Line | Data |
---|---|---|
2ba45a60 DM |
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 | }; |