FFmpeg
libavformat
rtpenc_vp8.c
Go to the documentation of this file.
1
/*
2
* RTP VP8 Packetizer
3
* Copyright (c) 2010 Josh Allmann
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 "
rtpenc.h
"
23
24
/* Based on a draft spec for VP8 RTP.
25
* ( http://tools.ietf.org/html/draft-ietf-payload-vp8-05 ) */
26
void
ff_rtp_send_vp8
(
AVFormatContext
*
s1
,
const
uint8_t *buf,
int
size
)
27
{
28
RTPMuxContext
*
s
=
s1
->priv_data;
29
int
len
, max_packet_size, header_size;
30
31
s
->buf_ptr =
s
->buf;
32
s
->timestamp =
s
->cur_timestamp;
33
34
// extended control bit set, reference frame, start of partition,
35
// partition id 0
36
*
s
->buf_ptr++ = 0x90;
37
*
s
->buf_ptr++ = 0x80;
// Picture id present
38
*
s
->buf_ptr++ = ((
s
->frame_count & 0x7f00) >> 8) | 0x80;
39
*
s
->buf_ptr++ =
s
->frame_count++ & 0xff;
40
// Calculate the number of remaining bytes
41
header_size =
s
->buf_ptr -
s
->buf;
42
max_packet_size =
s
->max_payload_size - header_size;
43
44
while
(
size
> 0) {
45
len
=
FFMIN
(
size
, max_packet_size);
46
47
memcpy(
s
->buf_ptr, buf,
len
);
48
// marker bit is last packet in frame
49
ff_rtp_send_data
(
s1
,
s
->buf,
len
+ header_size,
size
==
len
);
50
51
size
-=
len
;
52
buf +=
len
;
53
// Clear the partition start bit, keep the rest of the header untouched
54
s
->buf[0] &= ~0x10;
55
}
56
}
ff_rtp_send_data
void ff_rtp_send_data(AVFormatContext *s1, const uint8_t *buf1, int len, int m)
Definition:
rtpenc.c:334
s
#define s(width, name)
Definition:
cbs_vp9.c:256
s1
#define s1
Definition:
regdef.h:38
AVFormatContext
Format I/O context.
Definition:
avformat.h:1213
RTPMuxContext
Definition:
rtpenc.h:27
size
int size
Definition:
twinvq_data.h:10344
FFMIN
#define FFMIN(a, b)
Definition:
macros.h:49
len
int len
Definition:
vorbis_enc_data.h:426
rtpenc.h
ff_rtp_send_vp8
void ff_rtp_send_vp8(AVFormatContext *s1, const uint8_t *buf, int size)
Definition:
rtpenc_vp8.c:26
Generated on Wed Aug 24 2022 21:42:19 for FFmpeg by
1.8.17