FFmpeg
rtpdec_mpeg12.c
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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 
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 
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 
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 };
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
RTP/JPEG specific private data.
Definition: rdt.c:83
int index
stream index in AVFormatContext
Definition: avformat.h:881
const RTPDynamicProtocolHandler ff_mpeg_video_dynamic_handler
Definition: rtpdec_mpeg12.c:60
static AVPacket pkt
enum AVMediaType codec_type
Definition: rtpdec.h:117
Macro definitions for various function/variable attributes.
Format I/O context.
Definition: avformat.h:1355
uint8_t
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:91
uint8_t * data
Definition: packet.h:363
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:88
const RTPDynamicProtocolHandler ff_mpeg_audio_dynamic_handler
Definition: rtpdec_mpeg12.c:52
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: codec_id.h:419
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
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)
Definition: rtpdec_mpeg12.c:26
AVFormatContext * ctx
Definition: movenc.c:48
preferred ID for MPEG-1/2 video decoding
Definition: codec_id.h:51
Stream structure.
Definition: avformat.h:880
#define flags(name, subs,...)
Definition: cbs_av1.c:560
full parsing and repack
Definition: avformat.h:799
int len
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1027
int stream_index
Definition: packet.h:365
This structure stores compressed data.
Definition: packet.h:340