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rtpenc_latm.c
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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 
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 }
const char * s
Definition: avisynth_c.h:631
int max_payload_size
Definition: rtpenc.h:38
Format I/O context.
Definition: avformat.h:1325
uint8_t
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1393
uint8_t * buf
Definition: rtpenc.h:49
ptrdiff_t size
Definition: opengl_enc.c:101
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3957
#define FFMIN(a, b)
Definition: common.h:96
void ff_rtp_send_data(AVFormatContext *s1, const uint8_t *buf1, int len, int m)
Definition: rtpenc.c:330
uint32_t cur_timestamp
Definition: rtpenc.h:37
#define s1
Definition: regdef.h:38
Main libavformat public API header.
uint32_t timestamp
Definition: rtpenc.h:35
int len
void * priv_data
Format private data.
Definition: avformat.h:1353
AVCodecParameters * codecpar
Definition: avformat.h:1228
void ff_rtp_send_latm(AVFormatContext *s1, const uint8_t *buff, int size)
Definition: rtpenc_latm.c:25