FFmpeg
4.0
libavformat
rtpdec_mpeg12.c
Go to the documentation of this file.
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/*
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* Common code for the RTP depacketization of MPEG-1/2 formats.
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* Copyright (c) 2002 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "
libavutil/attributes.h
"
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#include "
libavutil/intreadwrite.h
"
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#include "
rtpdec_formats.h
"
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static
int
mpeg_parse_packet
(
AVFormatContext
*
ctx
,
PayloadContext
*
data
,
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AVStream
*st,
AVPacket
*
pkt
, uint32_t *timestamp,
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const
uint8_t
*
buf
,
int
len
, uint16_t seq,
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int
flags
)
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{
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unsigned
int
h
;
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if
(len <= 4)
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return
AVERROR_INVALIDDATA
;
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h =
AV_RB32
(buf);
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buf += 4;
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len -= 4;
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if
(st->
codecpar
->
codec_type
==
AVMEDIA_TYPE_VIDEO
&& h & (1 << 26)) {
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/* MPEG-2 */
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if
(len <= 4)
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return
AVERROR_INVALIDDATA
;
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buf += 4;
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len -= 4;
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}
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if
(
av_new_packet
(pkt, len) < 0)
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return
AVERROR
(ENOMEM);
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memcpy(pkt->
data
, buf, len);
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pkt->
stream_index
= st->
index
;
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return
0;
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}
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const
RTPDynamicProtocolHandler
ff_mpeg_audio_dynamic_handler
= {
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.
codec_type
=
AVMEDIA_TYPE_AUDIO
,
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.codec_id =
AV_CODEC_ID_MP3
,
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.need_parsing =
AVSTREAM_PARSE_FULL
,
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.parse_packet =
mpeg_parse_packet
,
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.static_payload_id = 14,
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};
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const
RTPDynamicProtocolHandler
ff_mpeg_video_dynamic_handler
= {
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.
codec_type
=
AVMEDIA_TYPE_VIDEO
,
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.codec_id =
AV_CODEC_ID_MPEG2VIDEO
,
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.need_parsing =
AVSTREAM_PARSE_FULL
,
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.parse_packet =
mpeg_parse_packet
,
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.static_payload_id = 32,
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};
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition:
error.h:59
h
h
Definition:
vp9dsp_template.c:2038
PayloadContext
RTP/JPEG specific private data.
Definition:
rdt.c:83
RTPDynamicProtocolHandler
Definition:
rtpdec.h:115
AVStream::index
int index
stream index in AVFormatContext
Definition:
avformat.h:874
ff_mpeg_video_dynamic_handler
const RTPDynamicProtocolHandler ff_mpeg_video_dynamic_handler
Definition:
rtpdec_mpeg12.c:59
pkt
static AVPacket pkt
Definition:
demuxing_decoding.c:54
RTPDynamicProtocolHandler::codec_type
enum AVMediaType codec_type
Definition:
rtpdec.h:117
attributes.h
Macro definitions for various function/variable attributes.
AVFormatContext
Format I/O context.
Definition:
avformat.h:1342
uint8_t
uint8_t
Definition:
audio_convert.c:194
AV_RB32
#define AV_RB32
Definition:
intreadwrite.h:130
data
const char data[16]
Definition:
mxf.c:90
AVPacket::data
uint8_t * data
Definition:
avcodec.h:1430
flags
static int flags
Definition:
log.c:55
av_new_packet
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
ff_mpeg_audio_dynamic_handler
const RTPDynamicProtocolHandler ff_mpeg_audio_dynamic_handler
Definition:
rtpdec_mpeg12.c:51
AVERROR
#define AVERROR(e)
Definition:
error.h:43
AV_CODEC_ID_MP3
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition:
avcodec.h:552
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition:
avcodec.h:3880
AVMEDIA_TYPE_AUDIO
Definition:
avutil.h:202
mpeg_parse_packet
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
intreadwrite.h
ctx
AVFormatContext * ctx
Definition:
movenc.c:48
AV_CODEC_ID_MPEG2VIDEO
preferred ID for MPEG-1/2 video decoding
Definition:
avcodec.h:220
AVStream
Stream structure.
Definition:
avformat.h:873
buf
void * buf
Definition:
avisynth_c.h:690
AVSTREAM_PARSE_FULL
full parsing and repack
Definition:
avformat.h:793
len
int len
Definition:
vorbis_enc_data.h:452
AVMEDIA_TYPE_VIDEO
Definition:
avutil.h:201
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition:
avformat.h:1020
rtpdec_formats.h
AVPacket::stream_index
int stream_index
Definition:
avcodec.h:1432
AVPacket
This structure stores compressed data.
Definition:
avcodec.h:1407
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