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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 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 
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 
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 
59 
60  if (avio_rl32(pb) == SOX_TAG) {
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 {
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)
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) /* 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,
110  }
111 
112  avio_skip(pb, header_size - SOX_FIXED_HDR - comment_size);
113 
116  st->codecpar->bit_rate = st->codecpar->sample_rate *
118  st->codecpar->channels;
120  st->codecpar->channels / 8;
121 
122  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
123 
124  return 0;
125 }
126 
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 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
Bytestream IO Context.
Definition: avio.h:111
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4404
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3915
static int sox_probe(AVProbeData *p)
Definition: soxdec.c:40
static int sox_read_header(AVFormatContext *s)
Definition: soxdec.c:47
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:287
Format I/O context.
Definition: avformat.h:1319
Public dictionary API.
static av_always_inline double av_int2double(uint64_t i)
Reinterpret a 64-bit integer as a double.
Definition: intfloat.h:60
#define av_malloc(s)
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:703
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4042
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:87
uint64_t avio_rb64(AVIOContext *s)
Definition: aviobuf.c:770
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:550
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3944
#define U(x)
Definition: vp56_arith.h:37
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1533
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:672
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3911
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:461
int block_align
Audio only.
Definition: avcodec.h:4032
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that's been allocated with av_malloc() or another memory allocation functio...
Definition: dict.h:76
#define SOX_TAG
Definition: sox.h:27
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:45
Stream structure.
Definition: avformat.h:876
int ff_pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: pcm.c:29
sample_rate
AVIOContext * pb
I/O context.
Definition: avformat.h:1361
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:69
This structure contains the data a format has to probe a file.
Definition: avformat.h:459
int sample_rate
Audio only.
Definition: avcodec.h:4025
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:471
Main libavformat public API header.
AVInputFormat ff_sox_demuxer
Definition: soxdec.c:127
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:3957
int channels
Audio only.
Definition: avcodec.h:4021
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:660
AVCodecParameters * codecpar
Definition: avformat.h:1006
#define SOX_FIXED_HDR
Size of fixed header without magic.
Definition: sox.h:25
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:680