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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
/*
* 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
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* SoX native format demuxer
* @author Daniel Verkamp
* @see http://wiki.multimedia.cx/index.php?title=SoX_native_intermediate_format
*/
#include "libavutil/intreadwrite.h"
#include "libavutil/intfloat_readwrite.h"
#include "libavutil/dict.h"
#include "avformat.h"
#include "pcm.h"
#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;
}
static int sox_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
AVIOContext *pb = s->pb;
unsigned header_size, comment_size;
double sample_rate, sample_rate_frac;
AVStream *st;
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
if (avio_rl32(pb) == SOX_TAG) {
st->codec->codec_id = CODEC_ID_PCM_S32LE;
header_size = avio_rl32(pb);
avio_skip(pb, 8); /* sample count */
sample_rate = av_int2dbl(avio_rl64(pb));
st->codec->channels = avio_rl32(pb);
comment_size = avio_rl32(pb);
} else {
st->codec->codec_id = CODEC_ID_PCM_S32BE;
header_size = avio_rb32(pb);
avio_skip(pb, 8); /* sample count */
sample_rate = av_int2dbl(avio_rb64(pb));
st->codec->channels = avio_rb32(pb);
comment_size = avio_rb32(pb);
}
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;
}
if (comment_size && comment_size < UINT_MAX) {
char *comment = av_malloc(comment_size+1);
if (avio_read(pb, comment, comment_size) != comment_size) {
av_freep(&comment);
return AVERROR(EIO);
}
comment[comment_size] = 0;
av_dict_set(&s->metadata, "comment", comment,
AV_DICT_DONT_STRDUP_VAL);
}
avio_skip(pb, header_size - SOX_FIXED_HDR - comment_size);
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;
st->codec->block_align = st->codec->bits_per_coded_sample *
st->codec->channels / 8;
av_set_pts_info(st, 64, 1, st->codec->sample_rate);
return 0;
}
#define SOX_SAMPLES 1024
static int sox_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
int ret, size;
if (s->pb->eof_reached)
return AVERROR_EOF;
size = SOX_SAMPLES*s->streams[0]->codec->block_align;
ret = av_get_packet(s->pb, pkt, size);
if (ret < 0)
return AVERROR(EIO);
pkt->stream_index = 0;
pkt->size = ret;
return 0;
}
AVInputFormat ff_sox_demuxer = {
.name = "sox",
.long_name = NULL_IF_CONFIG_SMALL("SoX native format"),
.read_probe = sox_probe,
.read_header = sox_read_header,
.read_packet = sox_read_packet,
.read_seek = pcm_read_seek,
};
|
