FFmpeg
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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int
ret
;
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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
((
ret
=
av_new_packet
(
pkt
,
len
)) < 0)
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return
ret
;
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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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};
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition:
codec_par.h:51
rtpdec_formats.h
ff_mpeg_audio_dynamic_handler
const RTPDynamicProtocolHandler ff_mpeg_audio_dynamic_handler
Definition:
rtpdec_mpeg12.c:52
AVPacket::data
uint8_t * data
Definition:
packet.h:539
data
const char data[16]
Definition:
mxf.c:149
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
AV_CODEC_ID_MP3
@ AV_CODEC_ID_MP3
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition:
codec_id.h:447
pkt
AVPacket * pkt
Definition:
movenc.c:60
intreadwrite.h
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:
packet.c:98
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition:
avutil.h:202
ctx
AVFormatContext * ctx
Definition:
movenc.c:49
AVFormatContext
Format I/O context.
Definition:
avformat.h:1300
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition:
avformat.h:771
AV_RB32
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:96
attributes.h
ff_mpeg_video_dynamic_handler
const RTPDynamicProtocolHandler ff_mpeg_video_dynamic_handler
Definition:
rtpdec_mpeg12.c:60
len
int len
Definition:
vorbis_enc_data.h:426
ret
ret
Definition:
filter_design.txt:187
AVStream
Stream structure.
Definition:
avformat.h:748
AVStream::index
int index
stream index in AVFormatContext
Definition:
avformat.h:754
RTPDynamicProtocolHandler::codec_type
enum AVMediaType codec_type
Definition:
rtpdec.h:118
AVPacket::stream_index
int stream_index
Definition:
packet.h:541
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition:
avutil.h:201
AVPacket
This structure stores compressed data.
Definition:
packet.h:516
AVSTREAM_PARSE_FULL
@ AVSTREAM_PARSE_FULL
full parsing and repack
Definition:
avformat.h:593
flags
#define flags(name, subs,...)
Definition:
cbs_av1.c:482
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition:
error.h:61
h
h
Definition:
vp9dsp_template.c:2070
PayloadContext
RTP/JPEG specific private data.
Definition:
rdt.c:85
AV_CODEC_ID_MPEG2VIDEO
@ AV_CODEC_ID_MPEG2VIDEO
preferred ID for MPEG-1/2 video decoding
Definition:
codec_id.h:54
RTPDynamicProtocolHandler
Definition:
rtpdec.h:116
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