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 Libav.
9  *
10  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23  */
24 
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 
49 {
50  AVIOContext *pb = s->pb;
51  unsigned header_size, comment_size;
52  double sample_rate, sample_rate_frac;
53  AVStream *st;
54 
55  st = avformat_new_stream(s, NULL);
56  if (!st)
57  return AVERROR(ENOMEM);
58 
60 
61  if (avio_rl32(pb) == SOX_TAG) {
63  header_size = avio_rl32(pb);
64  avio_skip(pb, 8); /* sample count */
65  sample_rate = av_int2double(avio_rl64(pb));
66  st->codec->channels = avio_rl32(pb);
67  comment_size = avio_rl32(pb);
68  } else {
70  header_size = avio_rb32(pb);
71  avio_skip(pb, 8); /* sample count */
72  sample_rate = av_int2double(avio_rb64(pb));
73  st->codec->channels = avio_rb32(pb);
74  comment_size = avio_rb32(pb);
75  }
76 
77  if (comment_size > 0xFFFFFFFFU - SOX_FIXED_HDR - 4U) {
78  av_log(s, AV_LOG_ERROR, "invalid comment size (%u)\n", comment_size);
79  return -1;
80  }
81 
82  if (sample_rate <= 0 || sample_rate > INT_MAX) {
83  av_log(s, AV_LOG_ERROR, "invalid sample rate (%f)\n", sample_rate);
84  return -1;
85  }
86 
87  sample_rate_frac = sample_rate - floor(sample_rate);
88  if (sample_rate_frac)
90  "truncating fractional part of sample rate (%f)\n",
91  sample_rate_frac);
92 
93  if ((header_size + 4) & 7 || header_size < SOX_FIXED_HDR + comment_size
94  || st->codec->channels > 65535) /* Reserve top 16 bits */ {
95  av_log(s, AV_LOG_ERROR, "invalid header\n");
96  return -1;
97  }
98 
99  if (comment_size && comment_size < UINT_MAX) {
100  char *comment = av_malloc(comment_size+1);
101  if (avio_read(pb, comment, comment_size) != comment_size) {
102  av_freep(&comment);
103  return AVERROR(EIO);
104  }
105  comment[comment_size] = 0;
106 
107  av_dict_set(&s->metadata, "comment", comment,
109  }
110 
111  avio_skip(pb, header_size - SOX_FIXED_HDR - comment_size);
112 
113  st->codec->sample_rate = sample_rate;
114  st->codec->bits_per_coded_sample = 32;
115  st->codec->bit_rate = st->codec->sample_rate *
117  st->codec->channels;
119  st->codec->channels / 8;
120 
121  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
122 
123  return 0;
124 }
125 
126 #define SOX_SAMPLES 1024
127 
129  AVPacket *pkt)
130 {
131  int ret, size;
132 
133  if (s->pb->eof_reached)
134  return AVERROR_EOF;
135 
136  size = SOX_SAMPLES*s->streams[0]->codec->block_align;
137  ret = av_get_packet(s->pb, pkt, size);
138  if (ret < 0)
139  return AVERROR(EIO);
140  pkt->stream_index = 0;
141  pkt->size = ret;
142 
143  return 0;
144 }
145 
147  .name = "sox",
148  .long_name = NULL_IF_CONFIG_SMALL("SoX native format"),
149  .read_probe = sox_probe,
150  .read_header = sox_read_header,
151  .read_packet = sox_read_packet,
152  .read_seek = pcm_read_seek,
153 };
Bytestream IO Context.
Definition: avio.h:68
int size
AV_WL32 AV_WL24 AV_WL16 AV_RB32
Definition: bytestream.h:89
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the pts for a given stream.
Definition: utils.c:3828
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:117
int size
Definition: avcodec.h:909
static int sox_probe(AVProbeData *p)
Definition: soxdec.c:40
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:1751
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:147
Format I/O context.
Definition: avformat.h:863
Public dictionary API.
static av_always_inline double av_int2double(uint64_t i)
Reinterpret a 64-bit integer as a double.
Definition: intfloat.h:58
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:769
AVStream ** streams
Definition: avformat.h:908
#define AVERROR_EOF
End of file.
Definition: error.h:51
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:269
uint64_t avio_rb64(AVIOContext *s)
Definition: aviobuf.c:842
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:1974
#define SOX_SAMPLES
Definition: soxdec.c:126
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:652
static int sox_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: soxdec.c:128
AVDictionary * metadata
Definition: avformat.h:1085
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:738
#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:191
AV_RL32
Definition: bytestream.h:89
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:140
AVStream * avformat_new_stream(AVFormatContext *s, AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:2776
AVCodecContext * codec
codec context
Definition: avformat.h:623
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:341
int bit_rate
the average bitrate
Definition: avcodec.h:1340
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that's been allocated with av_malloc() and chilren.
Definition: dict.h:66
static av_always_inline int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: avio.h:483
#define SOX_TAG
Definition: sox.h:27
Stream structure.
Definition: avformat.h:620
static int sox_read_header(AVFormatContext *s, AVFormatParameters *ap)
Definition: soxdec.c:47
int pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:26
NULL
Definition: eval.c:50
enum AVMediaType codec_type
Definition: avcodec.h:1574
int sample_rate
samples per second
Definition: avcodec.h:1456
AVIOContext * pb
Definition: avformat.h:896
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:111
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:50
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:64
This structure contains the data a format has to probe a file.
Definition: avformat.h:339
#define AVPROBE_SCORE_MAX
maximum score, half of that is used for file-extension-based detection
Definition: avformat.h:345
Main libavformat public API header.
AVInputFormat ff_sox_demuxer
Definition: soxdec.c:146
int eof_reached
true if eof reached
Definition: avio.h:98
int channels
number of audio channels
Definition: avcodec.h:1457
Definition: vf_drawbox.c:32
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:460
int stream_index
Definition: avcodec.h:910
#define SOX_FIXED_HDR
Size of fixed header without magic.
Definition: sox.h:25
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:746
enum CodecID codec_id
Definition: avcodec.h:1575