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
ff_rtp_send_latm(AVFormatContext * s1,const uint8_t * buff,int size)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 }
62