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
sox_probe(const AVProbeData * p)40 static int sox_probe(const 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
sox_read_header(AVFormatContext * s)47 static int sox_read_header(AVFormatContext *s)
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
58 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
59
60 if (avio_rl32(pb) == SOX_TAG) {
61 st->codecpar->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 st->codecpar->channels = avio_rl32(pb);
66 comment_size = avio_rl32(pb);
67 } else {
68 st->codecpar->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 st->codecpar->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)
88 av_log(s, AV_LOG_WARNING,
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->codecpar->channels > 65535 || st->codecpar->channels <= 0) /* 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,
109 AV_DICT_DONT_STRDUP_VAL);
110 }
111
112 avio_skip(pb, header_size - SOX_FIXED_HDR - comment_size);
113
114 st->codecpar->sample_rate = sample_rate;
115 st->codecpar->bits_per_coded_sample = 32;
116 st->codecpar->bit_rate = (int64_t)st->codecpar->sample_rate *
117 st->codecpar->bits_per_coded_sample *
118 st->codecpar->channels;
119 st->codecpar->block_align = st->codecpar->bits_per_coded_sample *
120 st->codecpar->channels / 8;
121
122 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
123
124 return 0;
125 }
126
127 AVInputFormat ff_sox_demuxer = {
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 };
135