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soxdec.c
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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 FFmpeg.
9  *
10  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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 
40 static 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 
48 {
49  AVIOContext *pb = s->pb;
50  unsigned header_size, comment_size;
51  double sample_rate, sample_rate_frac;
52  AVStream *st;
53 
54  st = avformat_new_stream(s, NULL);
55  if (!st)
56  return AVERROR(ENOMEM);
57 
59 
60  if (avio_rl32(pb) == SOX_TAG) {
62  header_size = avio_rl32(pb);
63  avio_skip(pb, 8); /* sample count */
64  sample_rate = av_int2double(avio_rl64(pb));
65  st->codec->channels = avio_rl32(pb);
66  comment_size = avio_rl32(pb);
67  } else {
69  header_size = avio_rb32(pb);
70  avio_skip(pb, 8); /* sample count */
71  sample_rate = av_int2double(avio_rb64(pb));
72  st->codec->channels = avio_rb32(pb);
73  comment_size = avio_rb32(pb);
74  }
75 
76  if (comment_size > 0xFFFFFFFFU - SOX_FIXED_HDR - 4U) {
77  av_log(s, AV_LOG_ERROR, "invalid comment size (%u)\n", comment_size);
78  return AVERROR_INVALIDDATA;
79  }
80 
81  if (sample_rate <= 0 || sample_rate > INT_MAX) {
82  av_log(s, AV_LOG_ERROR, "invalid sample rate (%f)\n", sample_rate);
83  return AVERROR_INVALIDDATA;
84  }
85 
86  sample_rate_frac = sample_rate - floor(sample_rate);
87  if (sample_rate_frac)
89  "truncating fractional part of sample rate (%f)\n",
90  sample_rate_frac);
91 
92  if ((header_size + 4) & 7 || header_size < SOX_FIXED_HDR + comment_size
93  || st->codec->channels > 65535) /* Reserve top 16 bits */ {
94  av_log(s, AV_LOG_ERROR, "invalid header\n");
95  return AVERROR_INVALIDDATA;
96  }
97 
98  if (comment_size && comment_size < UINT_MAX) {
99  char *comment = av_malloc(comment_size+1);
100  if(!comment)
101  return AVERROR(ENOMEM);
102  if (avio_read(pb, comment, comment_size) != comment_size) {
103  av_freep(&comment);
104  return AVERROR(EIO);
105  }
106  comment[comment_size] = 0;
107 
108  av_dict_set(&s->metadata, "comment", comment,
110  }
111 
112  avio_skip(pb, header_size - SOX_FIXED_HDR - comment_size);
113 
115  st->codec->bits_per_coded_sample = 32;
116  st->codec->bit_rate = st->codec->sample_rate *
118  st->codec->channels;
120  st->codec->channels / 8;
121 
122  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
123 
124  return 0;
125 }
126 
128  .name = "sox",
129  .long_name = NULL_IF_CONFIG_SMALL("SoX native"),
130  .read_probe = sox_probe,
131  .read_header = sox_read_header,
132  .read_packet = ff_pcm_read_packet,
133  .read_seek = ff_pcm_read_seek,
134 };