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2ba45a60 DM |
1 | /* |
2 | * RTP packetization for AMR audio | |
3 | * Copyright (c) 2007 Luca Abeni | |
4 | * Copyright (c) 2009 Martin Storsjo | |
5 | * | |
6 | * This file is part of FFmpeg. | |
7 | * | |
8 | * FFmpeg is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; either | |
11 | * version 2.1 of the License, or (at your option) any later version. | |
12 | * | |
13 | * FFmpeg is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with FFmpeg; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
21 | */ | |
22 | ||
23 | #include "avformat.h" | |
24 | #include "rtpenc.h" | |
25 | ||
26 | /** | |
27 | * Packetize AMR frames into RTP packets according to RFC 3267, | |
28 | * in octet-aligned mode. | |
29 | */ | |
30 | void ff_rtp_send_amr(AVFormatContext *s1, const uint8_t *buff, int size) | |
31 | { | |
32 | RTPMuxContext *s = s1->priv_data; | |
33 | int max_header_toc_size = 1 + s->max_frames_per_packet; | |
34 | uint8_t *p; | |
35 | int len; | |
36 | ||
37 | /* Test if the packet must be sent. */ | |
38 | len = s->buf_ptr - s->buf; | |
39 | if (s->num_frames == s->max_frames_per_packet || (len && len + size - 1 > s->max_payload_size)) { | |
40 | int header_size = s->num_frames + 1; | |
41 | p = s->buf + max_header_toc_size - header_size; | |
42 | if (p != s->buf) | |
43 | memmove(p, s->buf, header_size); | |
44 | ||
45 | ff_rtp_send_data(s1, p, s->buf_ptr - p, 1); | |
46 | ||
47 | s->num_frames = 0; | |
48 | } | |
49 | ||
50 | if (!s->num_frames) { | |
51 | s->buf[0] = 0xf0; | |
52 | s->buf_ptr = s->buf + max_header_toc_size; | |
53 | s->timestamp = s->cur_timestamp; | |
54 | } else { | |
55 | /* Mark the previous TOC entry as having more entries following. */ | |
56 | s->buf[1 + s->num_frames - 1] |= 0x80; | |
57 | } | |
58 | ||
59 | /* Copy the frame type and quality bits. */ | |
60 | s->buf[1 + s->num_frames++] = buff[0] & 0x7C; | |
61 | buff++; | |
62 | size--; | |
63 | memcpy(s->buf_ptr, buff, size); | |
64 | s->buf_ptr += size; | |
65 | } |