2 * SoX native format demuxer
3 * Copyright (c) 2009 Daniel Verkamp <daniel@drv.nu>
5 * Based on libSoX sox-fmt.c
6 * Copyright (c) 2008 robs@users.sourceforge.net
8 * This file is part of FFmpeg.
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.
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.
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
26 * SoX native format demuxer
28 * @author Daniel Verkamp
29 * @sa http://wiki.multimedia.cx/index.php?title=SoX_native_intermediate_format
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/dict.h"
38 static int sox_probe(AVProbeData *p)
40 if (AV_RL32(p->buf) == SOX_TAG || AV_RB32(p->buf) == SOX_TAG)
41 return AVPROBE_SCORE_MAX;
45 static int sox_read_header(AVFormatContext *s,
46 AVFormatParameters *ap)
48 AVIOContext *pb = s->pb;
49 unsigned header_size, comment_size;
50 double sample_rate, sample_rate_frac;
53 st = av_new_stream(s, 0);
55 return AVERROR(ENOMEM);
57 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
59 if (avio_rl32(pb) == SOX_TAG) {
60 st->codec->codec_id = CODEC_ID_PCM_S32LE;
61 header_size = avio_rl32(pb);
62 avio_skip(pb, 8); /* sample count */
63 sample_rate = av_int2dbl(avio_rl64(pb));
64 st->codec->channels = avio_rl32(pb);
65 comment_size = avio_rl32(pb);
67 st->codec->codec_id = CODEC_ID_PCM_S32BE;
68 header_size = avio_rb32(pb);
69 avio_skip(pb, 8); /* sample count */
70 sample_rate = av_int2dbl(avio_rb64(pb));
71 st->codec->channels = avio_rb32(pb);
72 comment_size = avio_rb32(pb);
75 if (comment_size > 0xFFFFFFFFU - SOX_FIXED_HDR - 4U) {
76 av_log(s, AV_LOG_ERROR, "invalid comment size (%u)\n", comment_size);
80 if (sample_rate <= 0 || sample_rate > INT_MAX) {
81 av_log(s, AV_LOG_ERROR, "invalid sample rate (%f)\n", sample_rate);
85 sample_rate_frac = sample_rate - floor(sample_rate);
87 av_log(s, AV_LOG_WARNING,
88 "truncating fractional part of sample rate (%f)\n",
91 if ((header_size + 4) & 7 || header_size < SOX_FIXED_HDR + comment_size
92 || st->codec->channels > 65535) /* Reserve top 16 bits */ {
93 av_log(s, AV_LOG_ERROR, "invalid header\n");
97 if (comment_size && comment_size < UINT_MAX) {
98 char *comment = av_malloc(comment_size+1);
99 if (avio_read(pb, comment, comment_size) != comment_size) {
103 comment[comment_size] = 0;
105 av_dict_set(&s->metadata, "comment", comment,
106 AV_DICT_DONT_STRDUP_VAL);
109 avio_skip(pb, header_size - SOX_FIXED_HDR - comment_size);
111 st->codec->sample_rate = sample_rate;
112 st->codec->bits_per_coded_sample = 32;
113 st->codec->bit_rate = st->codec->sample_rate *
114 st->codec->bits_per_coded_sample *
116 st->codec->block_align = st->codec->bits_per_coded_sample *
117 st->codec->channels / 8;
119 av_set_pts_info(st, 64, 1, st->codec->sample_rate);
124 #define SOX_SAMPLES 1024
126 static int sox_read_packet(AVFormatContext *s,
134 size = SOX_SAMPLES*s->streams[0]->codec->block_align;
135 ret = av_get_packet(s->pb, pkt, size);
138 pkt->stream_index = 0;
144 AVInputFormat ff_sox_demuxer = {
146 NULL_IF_CONFIG_SMALL("SoX native format"),