soxdec.c 4.67 KB
Newer Older
1 2 3 4 5 6 7
/*
 * SoX native format demuxer
 * Copyright (c) 2009 Daniel Verkamp <daniel@drv.nu>
 *
 * Based on libSoX sox-fmt.c
 * Copyright (c) 2008 robs@users.sourceforge.net
 *
8
 * This file is part of Libav.
9
 *
10
 * Libav is free software; you can redistribute it and/or
11 12 13 14
 * 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.
 *
15
 * Libav is distributed in the hope that it will be useful,
16 17 18 19 20
 * 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
21
 * License along with Libav; if not, write to the Free Software
22 23 24 25
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
26
 * @file
27
 * SoX native format demuxer
28
 * @author Daniel Verkamp
29
 * @see http://wiki.multimedia.cx/index.php?title=SoX_native_intermediate_format
30 31 32
 */

#include "libavutil/intreadwrite.h"
33
#include "libavutil/intfloat.h"
34
#include "libavutil/dict.h"
35
#include "avformat.h"
36
#include "internal.h"
37
#include "pcm.h"
38 39 40 41 42 43 44 45 46
#include "sox.h"

static int sox_probe(AVProbeData *p)
{
    if (AV_RL32(p->buf) == SOX_TAG || AV_RB32(p->buf) == SOX_TAG)
        return AVPROBE_SCORE_MAX;
    return 0;
}

47
static int sox_read_header(AVFormatContext *s)
48
{
49
    AVIOContext *pb = s->pb;
50 51 52 53
    unsigned header_size, comment_size;
    double sample_rate, sample_rate_frac;
    AVStream *st;

54
    st = avformat_new_stream(s, NULL);
55 56 57
    if (!st)
        return AVERROR(ENOMEM);

58
    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
59

60
    if (avio_rl32(pb) == SOX_TAG) {
61
        st->codec->codec_id = AV_CODEC_ID_PCM_S32LE;
62
        header_size         = avio_rl32(pb);
63
        avio_skip(pb, 8); /* sample count */
64
        sample_rate         = av_int2double(avio_rl64(pb));
65 66
        st->codec->channels = avio_rl32(pb);
        comment_size        = avio_rl32(pb);
67
    } else {
68
        st->codec->codec_id = AV_CODEC_ID_PCM_S32BE;
69
        header_size         = avio_rb32(pb);
70
        avio_skip(pb, 8); /* sample count */
71
        sample_rate         = av_int2double(avio_rb64(pb));
72 73
        st->codec->channels = avio_rb32(pb);
        comment_size        = avio_rb32(pb);
74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97
    }

    if (comment_size > 0xFFFFFFFFU - SOX_FIXED_HDR - 4U) {
        av_log(s, AV_LOG_ERROR, "invalid comment size (%u)\n", comment_size);
        return -1;
    }

    if (sample_rate <= 0 || sample_rate > INT_MAX) {
        av_log(s, AV_LOG_ERROR, "invalid sample rate (%f)\n", sample_rate);
        return -1;
    }

    sample_rate_frac = sample_rate - floor(sample_rate);
    if (sample_rate_frac)
        av_log(s, AV_LOG_WARNING,
               "truncating fractional part of sample rate (%f)\n",
               sample_rate_frac);

    if ((header_size + 4) & 7 || header_size < SOX_FIXED_HDR + comment_size
        || st->codec->channels > 65535) /* Reserve top 16 bits */ {
        av_log(s, AV_LOG_ERROR, "invalid header\n");
        return -1;
    }

98 99
    if (comment_size && comment_size < UINT_MAX) {
        char *comment = av_malloc(comment_size+1);
100
        if (avio_read(pb, comment, comment_size) != comment_size) {
101
            av_freep(&comment);
102
            return AVERROR(EIO);
103
        }
104 105
        comment[comment_size] = 0;

106 107
        av_dict_set(&s->metadata, "comment", comment,
                               AV_DICT_DONT_STRDUP_VAL);
108 109
    }

110
    avio_skip(pb, header_size - SOX_FIXED_HDR - comment_size);
111 112 113 114 115 116

    st->codec->sample_rate           = sample_rate;
    st->codec->bits_per_coded_sample = 32;
    st->codec->bit_rate              = st->codec->sample_rate *
                                       st->codec->bits_per_coded_sample *
                                       st->codec->channels;
117 118
    st->codec->block_align           = st->codec->bits_per_coded_sample *
                                       st->codec->channels / 8;
119

120
    avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
121 122 123 124

    return 0;
}

125
#define SOX_SAMPLES 1024
126 127 128 129

static int sox_read_packet(AVFormatContext *s,
                           AVPacket *pkt)
{
130
    int ret, size;
131

Anton Khirnov's avatar
Anton Khirnov committed
132
    if (s->pb->eof_reached)
133 134
        return AVERROR_EOF;

135 136
    size = SOX_SAMPLES*s->streams[0]->codec->block_align;
    ret = av_get_packet(s->pb, pkt, size);
137 138 139 140 141 142 143 144
    if (ret < 0)
        return AVERROR(EIO);
    pkt->stream_index = 0;
    pkt->size = ret;

    return 0;
}

145
AVInputFormat ff_sox_demuxer = {
146
    .name           = "sox",
147
    .long_name      = NULL_IF_CONFIG_SMALL("SoX native"),
148 149 150
    .read_probe     = sox_probe,
    .read_header    = sox_read_header,
    .read_packet    = sox_read_packet,
151
    .read_seek      = ff_pcm_read_seek,
152
};