aboutsummaryrefslogtreecommitdiffstats
path: root/libavformat/ilbc.c
blob: 6b5bb33b620474b0ec7dd3cc5dc06170e2ff2703 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
/*
 * iLBC storage file format
 * Copyright (c) 2012 Martin Storsjo
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "config_components.h"

#include "avformat.h"
#include "internal.h"
#include "mux.h"
#include "rawenc.h"

static const char mode20_header[] = "#!iLBC20\n";
static const char mode30_header[] = "#!iLBC30\n";

static int ilbc_write_header(AVFormatContext *s)
{
    AVIOContext *pb = s->pb;
    AVCodecParameters *par;

    if (s->nb_streams != 1) {
        av_log(s, AV_LOG_ERROR, "Unsupported number of streams\n");
        return AVERROR(EINVAL);
    }
    par = s->streams[0]->codecpar;

    if (par->codec_id != AV_CODEC_ID_ILBC) {
        av_log(s, AV_LOG_ERROR, "Unsupported codec\n");
        return AVERROR(EINVAL);
    }

    if (par->block_align == 50) {
        avio_write(pb, mode30_header, sizeof(mode30_header) - 1);
    } else if (par->block_align == 38) {
        avio_write(pb, mode20_header, sizeof(mode20_header) - 1);
    } else {
        av_log(s, AV_LOG_ERROR, "Unsupported mode\n");
        return AVERROR(EINVAL);
    }
    return 0;
}

static int ilbc_probe(const AVProbeData *p)
{
    // Only check for "#!iLBC" which matches both formats
    if (!memcmp(p->buf, mode20_header, 6))
        return AVPROBE_SCORE_MAX;
    else
        return 0;
}

static int ilbc_read_header(AVFormatContext *s)
{
    AVIOContext *pb = s->pb;
    AVStream *st;
    uint8_t header[9];

    avio_read(pb, header, 9);

    st = avformat_new_stream(s, NULL);
    if (!st)
        return AVERROR(ENOMEM);
    st->codecpar->codec_id = AV_CODEC_ID_ILBC;
    st->codecpar->sample_rate = 8000;
    st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
    st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
    st->start_time = 0;
    avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
    if (!memcmp(header, mode20_header, sizeof(mode20_header) - 1)) {
        st->codecpar->block_align = 38;
        st->codecpar->bit_rate = 15200;
    } else if (!memcmp(header, mode30_header, sizeof(mode30_header) - 1)) {
        st->codecpar->block_align = 50;
        st->codecpar->bit_rate = 13333;
    } else {
        av_log(s, AV_LOG_ERROR, "Unrecognized iLBC file header\n");
        return AVERROR_INVALIDDATA;
    }

    return 0;
}

static int ilbc_read_packet(AVFormatContext *s,
                          AVPacket *pkt)
{
    AVCodecParameters *par = s->streams[0]->codecpar;
    int ret;

    if ((ret = av_get_packet(s->pb, pkt, par->block_align)) != par->block_align)
        return ret < 0 ? ret : AVERROR_INVALIDDATA;

    pkt->stream_index = 0;
    pkt->duration = par->block_align == 38 ? 160 : 240;

    return 0;
}

const AVInputFormat ff_ilbc_demuxer = {
    .name         = "ilbc",
    .long_name    = NULL_IF_CONFIG_SMALL("iLBC storage"),
    .read_probe   = ilbc_probe,
    .read_header  = ilbc_read_header,
    .read_packet  = ilbc_read_packet,
    .flags        = AVFMT_GENERIC_INDEX,
};

#if CONFIG_ILBC_MUXER
const FFOutputFormat ff_ilbc_muxer = {
    .p.name         = "ilbc",
    .p.long_name    = NULL_IF_CONFIG_SMALL("iLBC storage"),
    .p.mime_type    = "audio/iLBC",
    .p.extensions   = "lbc",
    .p.audio_codec  = AV_CODEC_ID_ILBC,
    .p.flags        = AVFMT_NOTIMESTAMPS,
    .write_header = ilbc_write_header,
    .write_packet = ff_raw_write_packet,
};
#endif