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 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 
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 
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 
60 
61  if (avio_rl32(pb) == SOX_TAG) {
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 {
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)
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,
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 *
117  st->codec->channels;
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 
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 
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 };