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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  if (len <= 4)
33  return AVERROR_INVALIDDATA;
34  h = AV_RB32(buf);
35  buf += 4;
36  len -= 4;
37  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && h & (1 << 26)) {
38  /* MPEG-2 */
39  if (len <= 4)
40  return AVERROR_INVALIDDATA;
41  buf += 4;
42  len -= 4;
43  }
44  if (av_new_packet(pkt, len) < 0)
45  return AVERROR(ENOMEM);
46  memcpy(pkt->data, buf, len);
47  pkt->stream_index = st->index;
48  return 0;
49 }
50 
53  .codec_id = AV_CODEC_ID_MP3,
54  .need_parsing = AVSTREAM_PARSE_FULL,
55  .parse_packet = mpeg_parse_packet,
56  .static_payload_id = 14,
57 };
58 
61  .codec_id = AV_CODEC_ID_MPEG2VIDEO,
62  .need_parsing = AVSTREAM_PARSE_FULL,
63  .parse_packet = mpeg_parse_packet,
64  .static_payload_id = 32,
65 };
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
RTP/JPEG specific private data.
Definition: rdt.c:83
int index
stream index in AVFormatContext
Definition: avformat.h:879
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:1327
RTPDynamicProtocolHandler ff_mpeg_audio_dynamic_handler
Definition: rtpdec_mpeg12.c:51
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:87
uint8_t * data
Definition: avcodec.h:1590
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:86
#define AVERROR(e)
Definition: error.h:43
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:517
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3949
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: avcodec.h:196
Stream structure.
Definition: avformat.h:878
void * buf
Definition: avisynth_c.h:690
static int flags
Definition: cpu.c:47
full parsing and repack
Definition: avformat.h:808
int len
RTPDynamicProtocolHandler ff_mpeg_video_dynamic_handler
Definition: rtpdec_mpeg12.c:59
AVCodecParameters * codecpar
Definition: avformat.h:1230
int stream_index
Definition: avcodec.h:1592
This structure stores compressed data.
Definition: avcodec.h:1567