configure: Drop unused helper function test_cflags_cpp()
[libav.git] / libavformat / ilbc.c
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1/*
2 * iLBC storage file format
3 * Copyright (c) 2012 Martin Storsjo
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#include "avformat.h"
23#include "internal.h"
24
25static const char mode20_header[] = "#!iLBC20\n";
26static const char mode30_header[] = "#!iLBC30\n";
27
28static int ilbc_write_header(AVFormatContext *s)
29{
30 AVIOContext *pb = s->pb;
9200514a 31 AVCodecParameters *par;
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32
33 if (s->nb_streams != 1) {
34 av_log(s, AV_LOG_ERROR, "Unsupported number of streams\n");
35 return AVERROR(EINVAL);
36 }
9200514a 37 par = s->streams[0]->codecpar;
a2b251a0 38
9200514a 39 if (par->codec_id != AV_CODEC_ID_ILBC) {
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40 av_log(s, AV_LOG_ERROR, "Unsupported codec\n");
41 return AVERROR(EINVAL);
42 }
43
9200514a 44 if (par->block_align == 50) {
a2b251a0 45 avio_write(pb, mode30_header, sizeof(mode30_header) - 1);
9200514a 46 } else if (par->block_align == 38) {
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47 avio_write(pb, mode20_header, sizeof(mode20_header) - 1);
48 } else {
49 av_log(s, AV_LOG_ERROR, "Unsupported mode\n");
50 return AVERROR(EINVAL);
51 }
52 avio_flush(pb);
53 return 0;
54}
55
56static int ilbc_write_packet(AVFormatContext *s, AVPacket *pkt)
57{
58 avio_write(s->pb, pkt->data, pkt->size);
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59 return 0;
60}
61
62static int ilbc_probe(AVProbeData *p)
63{
64 // Only check for "#!iLBC" which matches both formats
65 if (!memcmp(p->buf, mode20_header, 6))
66 return AVPROBE_SCORE_MAX;
67 else
68 return 0;
69}
70
71static int ilbc_read_header(AVFormatContext *s)
72{
73 AVIOContext *pb = s->pb;
74 AVStream *st;
75 uint8_t header[9];
76
77 avio_read(pb, header, 9);
78
79 st = avformat_new_stream(s, NULL);
80 if (!st)
81 return AVERROR(ENOMEM);
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82 st->codecpar->codec_id = AV_CODEC_ID_ILBC;
83 st->codecpar->sample_rate = 8000;
84 st->codecpar->channels = 1;
85 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
a2b251a0 86 st->start_time = 0;
9200514a 87 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
a2b251a0 88 if (!memcmp(header, mode20_header, sizeof(mode20_header) - 1)) {
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89 st->codecpar->block_align = 38;
90 st->codecpar->bit_rate = 15200;
a2b251a0 91 } else if (!memcmp(header, mode30_header, sizeof(mode30_header) - 1)) {
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92 st->codecpar->block_align = 50;
93 st->codecpar->bit_rate = 13333;
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94 } else {
95 av_log(s, AV_LOG_ERROR, "Unrecognized iLBC file header\n");
96 return AVERROR_INVALIDDATA;
97 }
98
99 return 0;
100}
101
102static int ilbc_read_packet(AVFormatContext *s,
103 AVPacket *pkt)
104{
9200514a 105 AVCodecParameters *par = s->streams[0]->codecpar;
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106 int ret;
107
9200514a 108 if ((ret = av_new_packet(pkt, par->block_align)) < 0)
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109 return ret;
110
111 pkt->stream_index = 0;
112 pkt->pos = avio_tell(s->pb);
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113 pkt->duration = par->block_align == 38 ? 160 : 240;
114 if ((ret = avio_read(s->pb, pkt->data, par->block_align)) != par->block_align) {
ce70f28a 115 av_packet_unref(pkt);
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116 return ret < 0 ? ret : AVERROR(EIO);
117 }
118
119 return 0;
120}
121
122AVInputFormat ff_ilbc_demuxer = {
123 .name = "ilbc",
6774247a 124 .long_name = NULL_IF_CONFIG_SMALL("iLBC storage"),
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125 .read_probe = ilbc_probe,
126 .read_header = ilbc_read_header,
127 .read_packet = ilbc_read_packet,
128 .flags = AVFMT_GENERIC_INDEX,
129};
130
131AVOutputFormat ff_ilbc_muxer = {
132 .name = "ilbc",
6774247a 133 .long_name = NULL_IF_CONFIG_SMALL("iLBC storage"),
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134 .mime_type = "audio/iLBC",
135 .extensions = "lbc",
36ef5369 136 .audio_codec = AV_CODEC_ID_ILBC,
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137 .write_header = ilbc_write_header,
138 .write_packet = ilbc_write_packet,
139 .flags = AVFMT_NOTIMESTAMPS,
140};