1/*
2 * SoX native format demuxer
3 * Copyright (c) 2009 Daniel Verkamp <daniel@drv.nu>
4 *
5 * Based on libSoX sox-fmt.c
6 * Copyright (c) 2008 robs@users.sourceforge.net
7 *
8 * This file is part of Libav.
9 *
10 * Libav is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
14 *
15 * Libav is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18 * Lesser General Public License for more details.
19 *
20 * 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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25/**
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#include "sox.h"
39
40static int sox_probe(AVProbeData *p)
41{
42    if (AV_RL32(p->buf) == SOX_TAG || AV_RB32(p->buf) == SOX_TAG)
43        return AVPROBE_SCORE_MAX;
44    return 0;
45}
46
47static int sox_read_header(AVFormatContext *s,
48                           AVFormatParameters *ap)
49{
50    AVIOContext *pb = s->pb;
51    unsigned header_size, comment_size;
52    double sample_rate, sample_rate_frac;
53    AVStream *st;
54
55    st = avformat_new_stream(s, NULL);
56    if (!st)
57        return AVERROR(ENOMEM);
58
59    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
60
61    if (avio_rl32(pb) == SOX_TAG) {
62        st->codec->codec_id = CODEC_ID_PCM_S32LE;
63        header_size         = avio_rl32(pb);
64        avio_skip(pb, 8); /* sample count */
65        sample_rate         = av_int2double(avio_rl64(pb));
66        st->codec->channels = avio_rl32(pb);
67        comment_size        = avio_rl32(pb);
68    } else {
69        st->codec->codec_id = CODEC_ID_PCM_S32BE;
70        header_size         = avio_rb32(pb);
71        avio_skip(pb, 8); /* sample count */
72        sample_rate         = av_int2double(avio_rb64(pb));
73        st->codec->channels = avio_rb32(pb);
74        comment_size        = avio_rb32(pb);
75    }
76
77    if (comment_size > 0xFFFFFFFFU - SOX_FIXED_HDR - 4U) {
78        av_log(s, AV_LOG_ERROR, "invalid comment size (%u)\n", comment_size);
79        return -1;
80    }
81
82    if (sample_rate <= 0 || sample_rate > INT_MAX) {
83        av_log(s, AV_LOG_ERROR, "invalid sample rate (%f)\n", sample_rate);
84        return -1;
85    }
86
87    sample_rate_frac = sample_rate - floor(sample_rate);
88    if (sample_rate_frac)
89        av_log(s, AV_LOG_WARNING,
90               "truncating fractional part of sample rate (%f)\n",
91               sample_rate_frac);
92
93    if ((header_size + 4) & 7 || header_size < SOX_FIXED_HDR + comment_size
94        || st->codec->channels > 65535) /* Reserve top 16 bits */ {
95        av_log(s, AV_LOG_ERROR, "invalid header\n");
96        return -1;
97    }
98
99    if (comment_size && comment_size < UINT_MAX) {
100        char *comment = av_malloc(comment_size+1);
101        if (avio_read(pb, comment, comment_size) != comment_size) {
102            av_freep(&comment);
103            return AVERROR(EIO);
104        }
105        comment[comment_size] = 0;
106
107        av_dict_set(&s->metadata, "comment", comment,
108                               AV_DICT_DONT_STRDUP_VAL);
109    }
110
111    avio_skip(pb, header_size - SOX_FIXED_HDR - comment_size);
112
113    st->codec->sample_rate           = sample_rate;
114    st->codec->bits_per_coded_sample = 32;
115    st->codec->bit_rate              = st->codec->sample_rate *
116                                       st->codec->bits_per_coded_sample *
117                                       st->codec->channels;
118    st->codec->block_align           = st->codec->bits_per_coded_sample *
119                                       st->codec->channels / 8;
120
121    avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
122
123    return 0;
124}
125
126#define SOX_SAMPLES 1024
127
128static int sox_read_packet(AVFormatContext *s,
129                           AVPacket *pkt)
130{
131    int ret, size;
132
133    if (s->pb->eof_reached)
134        return AVERROR_EOF;
135
136    size = SOX_SAMPLES*s->streams[0]->codec->block_align;
137    ret = av_get_packet(s->pb, pkt, size);
138    if (ret < 0)
139        return AVERROR(EIO);
140    pkt->stream_index = 0;
141    pkt->size = ret;
142
143    return 0;
144}
145
146AVInputFormat ff_sox_demuxer = {
147    .name           = "sox",
148    .long_name      = NULL_IF_CONFIG_SMALL("SoX native format"),
149    .read_probe     = sox_probe,
150    .read_header    = sox_read_header,
151    .read_packet    = sox_read_packet,
152    .read_seek      = pcm_read_seek,
153};
154