FFmpeg
libavformat
rtpenc_latm.c
Go to the documentation of this file.
1
/*
2
* RTP Packetization of MPEG-4 Audio (RFC 3016)
3
* Copyright (c) 2011 Juan Carlos Rodriguez <ing.juancarlosrodriguez@hotmail.com>
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 "
avformat.h
"
23
#include "
rtpenc.h
"
24
25
void
ff_rtp_send_latm
(
AVFormatContext
*s1,
const
uint8_t *buff,
int
size
)
26
{
27
/* MP4A-LATM
28
* The RTP payload format specification is described in RFC 3016
29
* The encoding specifications are provided in ISO/IEC 14496-3 */
30
31
RTPMuxContext
*
s
= s1->
priv_data
;
32
int
header_size;
33
int
offset
= 0;
34
int
len
= 0;
35
36
/* skip ADTS header, if present */
37
if
((s1->
streams
[0]->
codecpar
->
extradata_size
) == 0) {
38
size
-= 7;
39
buff += 7;
40
}
41
42
/* PayloadLengthInfo() */
43
header_size =
size
/0xFF + 1;
44
memset(
s
->buf, 0xFF, header_size - 1);
45
s
->buf[header_size - 1] =
size
% 0xFF;
46
47
s
->timestamp =
s
->cur_timestamp;
48
49
/* PayloadMux() */
50
while
(
size
> 0) {
51
len
=
FFMIN
(
size
,
s
->max_payload_size - (!
offset
? header_size : 0));
52
size
-=
len
;
53
if
(!
offset
) {
54
memcpy(
s
->buf + header_size, buff,
len
);
55
ff_rtp_send_data
(s1,
s
->buf, header_size +
len
, !
size
);
56
}
else
{
57
ff_rtp_send_data
(s1, buff +
offset
,
len
, !
size
);
58
}
59
offset
+=
len
;
60
}
61
}
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition:
avformat.h:1368
ff_rtp_send_data
void ff_rtp_send_data(AVFormatContext *s1, const uint8_t *buf1, int len, int m)
Definition:
rtpenc.c:336
s
#define s(width, name)
Definition:
cbs_vp9.c:198
AVFormatContext
Format I/O context.
Definition:
avformat.h:1300
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition:
avformat.h:771
RTPMuxContext
Definition:
rtpenc.h:27
AVCodecParameters::extradata_size
int extradata_size
Size of the extradata content in bytes.
Definition:
codec_par.h:73
size
int size
Definition:
twinvq_data.h:10344
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition:
writing_filters.txt:86
FFMIN
#define FFMIN(a, b)
Definition:
macros.h:49
len
int len
Definition:
vorbis_enc_data.h:426
rtpenc.h
avformat.h
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition:
avformat.h:1328
ff_rtp_send_latm
void ff_rtp_send_latm(AVFormatContext *s1, const uint8_t *buff, int size)
Definition:
rtpenc_latm.c:25
Generated on Fri Dec 13 2024 19:22:47 for FFmpeg by
1.8.17