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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 | ||
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]->codec->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 | } |