FFmpeg
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(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 
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 = (int64_t)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
Bytestream IO Context.
Definition: avio.h:161
#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:4896
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3960
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:334
Format I/O context.
Definition: avformat.h:1358
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:803
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4469
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:924
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:650
static int FUNC() comment(CodedBitstreamContext *ctx, RWContext *rw, JPEGRawComment *current)
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3989
#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:1598
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:772
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3956
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
int block_align
Audio only.
Definition: avcodec.h:4077
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that&#39;s been allocated with av_malloc() or another memory allocation functio...
Definition: dict.h:76
#define s(width, name)
Definition: cbs_vp9.c:257
#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:52
Stream structure.
Definition: avformat.h:881
int ff_pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: pcm.c:29
sample_rate
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
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:70
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
int sample_rate
Audio only.
Definition: avcodec.h:4070
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
Main libavformat public API header.
static int sox_probe(const AVProbeData *p)
Definition: soxdec.c:40
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:4002
int channels
Audio only.
Definition: avcodec.h:4066
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:654
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
#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:780