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rtpenc_aac.c
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1 /*
2  * copyright (c) 2007 Luca Abeni
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "libavutil/intreadwrite.h"
22 
23 #include "avformat.h"
24 #include "rtpenc.h"
25 
26 
27 void ff_rtp_send_aac(AVFormatContext *s1, const uint8_t *buff, int size)
28 {
29  RTPMuxContext *s = s1->priv_data;
30  AVStream *st = s1->streams[0];
31  const int max_au_headers_size = 2 + 2 * s->max_frames_per_packet;
32  int len, max_packet_size = s->max_payload_size - max_au_headers_size;
33  uint8_t *p;
34 
35  /* skip ADTS header, if present */
36  if ((s1->streams[0]->codecpar->extradata_size) == 0) {
37  size -= 7;
38  buff += 7;
39  }
40 
41  /* test if the packet must be sent */
42  len = (s->buf_ptr - s->buf);
43  if (s->num_frames &&
45  (len + size) > s->max_payload_size ||
47  s1->max_delay, AV_TIME_BASE_Q) >= 0)) {
48  int au_size = s->num_frames * 2;
49 
50  p = s->buf + max_au_headers_size - au_size - 2;
51  if (p != s->buf) {
52  memmove(p + 2, s->buf + 2, au_size);
53  }
54  /* Write the AU header size */
55  AV_WB16(p, au_size * 8);
56 
57  ff_rtp_send_data(s1, p, s->buf_ptr - p, 1);
58 
59  s->num_frames = 0;
60  }
61  if (s->num_frames == 0) {
62  s->buf_ptr = s->buf + max_au_headers_size;
63  s->timestamp = s->cur_timestamp;
64  }
65 
66  if (size <= max_packet_size) {
67  p = s->buf + s->num_frames++ * 2 + 2;
68  AV_WB16(p, size * 8);
69  memcpy(s->buf_ptr, buff, size);
70  s->buf_ptr += size;
71  } else {
72  int au_size = size;
73 
74  max_packet_size = s->max_payload_size - 4;
75  p = s->buf;
76  AV_WB16(p, 2 * 8);
77  while (size > 0) {
78  len = FFMIN(size, max_packet_size);
79  AV_WB16(&p[2], au_size * 8);
80  memcpy(p + 4, buff, len);
81  ff_rtp_send_data(s1, p, len + 4, len == size);
82  size -= len;
83  buff += len;
84  }
85  }
86 }
const char * s
Definition: avisynth_c.h:768
int max_payload_size
Definition: rtpenc.h:38
Format I/O context.
Definition: avformat.h:1327
uint8_t
int max_frames_per_packet
Definition: rtpenc.h:52
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1395
uint8_t * buf
Definition: rtpenc.h:49
ptrdiff_t size
Definition: opengl_enc.c:101
#define AV_WB16(p, v)
Definition: intreadwrite.h:405
int av_compare_ts(int64_t ts_a, AVRational tb_a, int64_t ts_b, AVRational tb_b)
Compare two timestamps each in its own time base.
Definition: mathematics.c:147
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3971
void ff_rtp_send_aac(AVFormatContext *s1, const uint8_t *buff, int size)
Definition: rtpenc_aac.c:27
#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
Stream structure.
Definition: avformat.h:878
uint32_t cur_timestamp
Definition: rtpenc.h:37
AVStream * st
Definition: rtpenc.h:30
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:254
#define s1
Definition: regdef.h:38
int num_frames
Definition: rtpenc.h:39
uint8_t * buf_ptr
Definition: rtpenc.h:50
Main libavformat public API header.
uint32_t timestamp
Definition: rtpenc.h:35
int len
void * priv_data
Format private data.
Definition: avformat.h:1355
AVCodecParameters * codecpar
Definition: avformat.h:1230
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:915