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 int channels;
53 AVStream *st;
54
55 st = avformat_new_stream(s, NULL);
56 if (!st)
57 return AVERROR(ENOMEM);
58
59 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
60
61 if (avio_rl32(pb) == SOX_TAG) {
62 st->codecpar->codec_id = AV_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 channels = avio_rl32(pb);
67 comment_size = avio_rl32(pb);
68 } else {
69 st->codecpar->codec_id = AV_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 channels = avio_rb32(pb);
74 comment_size = avio_rb32(pb);
75 }
76
77 st->codecpar->ch_layout.nb_channels = channels;
78
79 if (comment_size > 0xFFFFFFFFU - SOX_FIXED_HDR - 4U) {
80 av_log(s, AV_LOG_ERROR, "invalid comment size (%u)\n", comment_size);
81 return AVERROR_INVALIDDATA;
82 }
83
84 if (sample_rate <= 0 || sample_rate > INT_MAX) {
85 av_log(s, AV_LOG_ERROR, "invalid sample rate (%f)\n", sample_rate);
86 return AVERROR_INVALIDDATA;
87 }
88
89 sample_rate_frac = sample_rate - floor(sample_rate);
90 if (sample_rate_frac)
91 av_log(s, AV_LOG_WARNING,
92 "truncating fractional part of sample rate (%f)\n",
93 sample_rate_frac);
94
95 if ((header_size + 4) & 7 || header_size < SOX_FIXED_HDR + comment_size
96 || channels > 65535 || channels <= 0) /* Reserve top 16 bits */ {
97 av_log(s, AV_LOG_ERROR, "invalid header\n");
98 return AVERROR_INVALIDDATA;
99 }
100
101 if (comment_size && comment_size < UINT_MAX) {
102 char *comment = av_malloc(comment_size+1);
103 if(!comment)
104 return AVERROR(ENOMEM);
105 if (avio_read(pb, comment, comment_size) != comment_size) {
106 av_freep(&comment);
107 return AVERROR(EIO);
108 }
109 comment[comment_size] = 0;
110
111 av_dict_set(&s->metadata, "comment", comment,
112 AV_DICT_DONT_STRDUP_VAL);
113 }
114
115 avio_skip(pb, header_size - SOX_FIXED_HDR - comment_size);
116
117 st->codecpar->sample_rate = sample_rate;
118 st->codecpar->bits_per_coded_sample = 32;
119 st->codecpar->bit_rate = (int64_t)st->codecpar->sample_rate *
120 st->codecpar->bits_per_coded_sample *
121 channels;
122 st->codecpar->block_align = st->codecpar->bits_per_coded_sample *
123 channels / 8;
124
125 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
126
127 return 0;
128 }
129
130 const AVInputFormat ff_sox_demuxer = {
131 .name = "sox",
132 .long_name = NULL_IF_CONFIG_SMALL("SoX native"),
133 .read_probe = sox_probe,
134 .read_header = sox_read_header,
135 .read_packet = ff_pcm_read_packet,
136 .read_seek = ff_pcm_read_seek,
137 };
138