Add Haivision SRT protocol
[libav.git] / libavformat / amr.c
1 /*
2 * amr file format
3 * Copyright (c) 2001 FFmpeg project
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /*
23 Write and read amr data according to RFC3267, http://www.ietf.org/rfc/rfc3267.txt?number=3267
24
25 Only mono files are supported.
26
27 */
28
29 #include "libavutil/channel_layout.h"
30 #include "avformat.h"
31 #include "internal.h"
32
33 static const char AMR_header[] = "#!AMR\n";
34 static const char AMRWB_header[] = "#!AMR-WB\n";
35
36 #if CONFIG_AMR_MUXER
37 static int amr_write_header(AVFormatContext *s)
38 {
39 AVIOContext *pb = s->pb;
40 AVCodecParameters *par = s->streams[0]->codecpar;
41
42 s->priv_data = NULL;
43
44 if (par->codec_id == AV_CODEC_ID_AMR_NB) {
45 avio_write(pb, AMR_header, sizeof(AMR_header) - 1); /* magic number */
46 } else if (par->codec_id == AV_CODEC_ID_AMR_WB) {
47 avio_write(pb, AMRWB_header, sizeof(AMRWB_header) - 1); /* magic number */
48 } else {
49 return -1;
50 }
51 avio_flush(pb);
52 return 0;
53 }
54
55 static int amr_write_packet(AVFormatContext *s, AVPacket *pkt)
56 {
57 avio_write(s->pb, pkt->data, pkt->size);
58 return 0;
59 }
60 #endif /* CONFIG_AMR_MUXER */
61
62 static int amr_probe(AVProbeData *p)
63 {
64 // Only check for "#!AMR" which could be amr-wb, amr-nb.
65 // This will also trigger multichannel files: "#!AMR_MC1.0\n" and
66 // "#!AMR-WB_MC1.0\n" (not supported)
67
68 if (!memcmp(p->buf, AMR_header, 5))
69 return AVPROBE_SCORE_MAX;
70 else
71 return 0;
72 }
73
74 /* amr input */
75 static int amr_read_header(AVFormatContext *s)
76 {
77 AVIOContext *pb = s->pb;
78 AVStream *st;
79 uint8_t header[9];
80
81 avio_read(pb, header, 6);
82
83 st = avformat_new_stream(s, NULL);
84 if (!st)
85 return AVERROR(ENOMEM);
86 if (memcmp(header, AMR_header, 6)) {
87 avio_read(pb, header + 6, 3);
88 if (memcmp(header, AMRWB_header, 9)) {
89 return -1;
90 }
91
92 st->codecpar->codec_tag = MKTAG('s', 'a', 'w', 'b');
93 st->codecpar->codec_id = AV_CODEC_ID_AMR_WB;
94 st->codecpar->sample_rate = 16000;
95 } else {
96 st->codecpar->codec_tag = MKTAG('s', 'a', 'm', 'r');
97 st->codecpar->codec_id = AV_CODEC_ID_AMR_NB;
98 st->codecpar->sample_rate = 8000;
99 }
100 st->codecpar->channels = 1;
101 st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
102 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
103 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
104
105 return 0;
106 }
107
108 static int amr_read_packet(AVFormatContext *s, AVPacket *pkt)
109 {
110 AVCodecParameters *par = s->streams[0]->codecpar;
111 int read, size = 0, toc, mode;
112 int64_t pos = avio_tell(s->pb);
113
114 if (s->pb->eof_reached) {
115 return AVERROR(EIO);
116 }
117
118 // FIXME this is wrong, this should rather be in an AVParser
119 toc = avio_r8(s->pb);
120 mode = (toc >> 3) & 0x0F;
121
122 if (par->codec_id == AV_CODEC_ID_AMR_NB) {
123 static const uint8_t packed_size[16] = {
124 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0
125 };
126
127 size = packed_size[mode] + 1;
128 } else if (par->codec_id == AV_CODEC_ID_AMR_WB) {
129 static const uint8_t packed_size[16] = {
130 18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1
131 };
132
133 size = packed_size[mode];
134 } else {
135 assert(0);
136 }
137
138 if (!size || av_new_packet(pkt, size))
139 return AVERROR(EIO);
140
141 /* Both AMR formats have 50 frames per second */
142 s->streams[0]->codecpar->bit_rate = size*8*50;
143
144 pkt->stream_index = 0;
145 pkt->pos = pos;
146 pkt->data[0] = toc;
147 pkt->duration = par->codec_id == AV_CODEC_ID_AMR_NB ? 160 : 320;
148 read = avio_read(s->pb, pkt->data + 1, size - 1);
149
150 if (read != size - 1) {
151 av_packet_unref(pkt);
152 return AVERROR(EIO);
153 }
154
155 return 0;
156 }
157
158 #if CONFIG_AMR_DEMUXER
159 AVInputFormat ff_amr_demuxer = {
160 .name = "amr",
161 .long_name = NULL_IF_CONFIG_SMALL("3GPP AMR"),
162 .read_probe = amr_probe,
163 .read_header = amr_read_header,
164 .read_packet = amr_read_packet,
165 .flags = AVFMT_GENERIC_INDEX,
166 };
167 #endif
168
169 #if CONFIG_AMR_MUXER
170 AVOutputFormat ff_amr_muxer = {
171 .name = "amr",
172 .long_name = NULL_IF_CONFIG_SMALL("3GPP AMR"),
173 .mime_type = "audio/amr",
174 .extensions = "amr",
175 .audio_codec = AV_CODEC_ID_AMR_NB,
176 .video_codec = AV_CODEC_ID_NONE,
177 .write_header = amr_write_header,
178 .write_packet = amr_write_packet,
179 .flags = AVFMT_NOTIMESTAMPS,
180 };
181 #endif