FFmpeg: libavformat/soxdec.c Source File

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 "libavutil/mem.h"
36 #include "avformat.h"
37 #include "demux.h"
38 #include "internal.h"
39 #include "pcm.h"
40 #include "sox.h"
41 
42  static int sox_probe(const AVProbeData *p)
43 {
44  if (AV_RL32(p->buf) != SOX_TAG && AV_RB32(p->buf) != SOX_TAG)
45  return 0;
46  if (AV_RN32(p->buf+4) == 0)
47  return 0;
48  if (AV_RN32(p->buf+24) == 0)
49  return 0;
50  return AVPROBE_SCORE_MAX;
51 }
52 
53  static int sox_read_header(AVFormatContext *s)
54 {
55  AVIOContext *pb = s->pb;
56  unsigned header_size, comment_size;
57  double sample_rate, sample_rate_frac;
58  int channels;
59  AVStream *st;
60 
61  st = avformat_new_stream(s, NULL);
62  if (!st)
63  return AVERROR(ENOMEM);
64 
65  st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
66 
67  if (avio_rl32(pb) == SOX_TAG) {
68  st->codecpar->codec_id = AV_CODEC_ID_PCM_S32LE;
69  header_size = avio_rl32(pb);
70  avio_skip(pb, 8); /* sample count */
71  sample_rate = av_int2double(avio_rl64(pb));
72  channels = avio_rl32(pb);
73  comment_size = avio_rl32(pb);
74  } else {
75  st->codecpar->codec_id = AV_CODEC_ID_PCM_S32BE;
76  header_size = avio_rb32(pb);
77  avio_skip(pb, 8); /* sample count */
78  sample_rate = av_int2double(avio_rb64(pb));
79  channels = avio_rb32(pb);
80  comment_size = avio_rb32(pb);
81  }
82 
83  st->codecpar->ch_layout.nb_channels = channels;
84 
85  if (comment_size > 0xFFFFFFFFU - SOX_FIXED_HDR - 4U) {
86  av_log(s, AV_LOG_ERROR, "invalid comment size (%u)\n", comment_size);
87  return AVERROR_INVALIDDATA;
88  }
89 
90  if (sample_rate <= 0 || sample_rate > INT_MAX) {
91  av_log(s, AV_LOG_ERROR, "invalid sample rate (%f)\n", sample_rate);
92  return AVERROR_INVALIDDATA;
93  }
94 
95  sample_rate_frac = sample_rate - floor(sample_rate);
96  if (sample_rate_frac)
97  av_log(s, AV_LOG_WARNING,
98  "truncating fractional part of sample rate (%f)\n",
99  sample_rate_frac);
100 
101  if ((header_size + 4) & 7 || header_size < SOX_FIXED_HDR + comment_size
102  || channels > 65535 || channels <= 0) /* Reserve top 16 bits */ {
103  av_log(s, AV_LOG_ERROR, "invalid header\n");
104  return AVERROR_INVALIDDATA;
105  }
106 
107  if (comment_size && comment_size < UINT_MAX) {
108  char *comment = av_malloc(comment_size+1);
109  if(!comment)
110  return AVERROR(ENOMEM);
111  if (avio_read(pb, comment, comment_size) != comment_size) {
112  av_freep(&comment);
113  return AVERROR(EIO);
114  }
115  comment[comment_size] = 0;
116 
117  av_dict_set(&s->metadata, "comment", comment,
118  AV_DICT_DONT_STRDUP_VAL);
119  }
120 
121  avio_skip(pb, header_size - SOX_FIXED_HDR - comment_size);
122 
123  st->codecpar->sample_rate = sample_rate;
124  st->codecpar->bits_per_coded_sample = 32;
125  st->codecpar->bit_rate = (int64_t)st->codecpar->sample_rate *
126  st->codecpar->bits_per_coded_sample *
127  channels;
128  st->codecpar->block_align = st->codecpar->bits_per_coded_sample *
129  channels / 8;
130 
131  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
132 
133  return 0;
134 }
135 
136  const FFInputFormat ff_sox_demuxer = {
137  .p.name = "sox",
138  .p.long_name = NULL_IF_CONFIG_SMALL("SoX (Sound eXchange) native"),
139  .read_probe = sox_probe,
140  .read_header = sox_read_header,
141  .read_packet = ff_pcm_read_packet,
142  .read_seek = ff_pcm_read_seek,
143 };
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
AVERROR
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
pcm.h
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:51
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
av_int2double
static av_always_inline double av_int2double(uint64_t i)
Reinterpret a 64-bit integer as a double.
Definition: intfloat.h:60
int64_t
long long int64_t
Definition: coverity.c:34
sox.h
sox_probe
static int sox_probe(const AVProbeData *p)
Definition: soxdec.c:42
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:321
intfloat.h
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:463
SOX_TAG
#define SOX_TAG
Definition: sox.h:27
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: avformat.c:860
AV_DICT_DONT_STRDUP_VAL
#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:79
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:761
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:198
floor
static __device__ float floor(float a)
Definition: cuda_runtime.h:173
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:553
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:453
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
ff_sox_demuxer
const FFInputFormat ff_sox_demuxer
Definition: soxdec.c:136
channels
channels
Definition: aptx.h:31
AVFormatContext
Format I/O context.
Definition: avformat.h:1287
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:771
NULL
#define NULL
Definition: coverity.c:32
avio_rb64
uint64_t avio_rb64(AVIOContext *s)
Definition: aviobuf.c:908
AV_RN32
#define AV_RN32(p)
Definition: intreadwrite.h:360
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:451
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:180
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:184
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:730
AVIOContext
Bytestream IO Context.
Definition: avio.h:160
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:94
AV_RB32
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:96
FFInputFormat::p
AVInputFormat p
The public AVInputFormat.
Definition: demux.h:41
sox_read_header
static int sox_read_header(AVFormatContext *s)
Definition: soxdec.c:53
AVCodecParameters::block_align
int block_align
Audio only.
Definition: codec_par.h:191
AV_CODEC_ID_PCM_S32BE
@ AV_CODEC_ID_PCM_S32BE
Definition: codec_id.h:337
demux.h
ff_pcm_read_packet
int ff_pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: pcm.c:57
AVStream
Stream structure.
Definition: avformat.h:748
comment
static int FUNC() comment(CodedBitstreamContext *ctx, RWContext *rw, JPEGRawComment *current)
Definition: cbs_jpeg_syntax_template.c:174
ff_pcm_read_seek
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:73
avformat.h
dict.h
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
U
#define U(x)
Definition: vpx_arith.h:37
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:612
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:318
AV_CODEC_ID_PCM_S32LE
@ AV_CODEC_ID_PCM_S32LE
Definition: codec_id.h:336
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:110
mem.h
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:55
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
av_dict_set
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:88
FFInputFormat
Definition: demux.h:37
avio_rl64
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:738
SOX_FIXED_HDR
#define SOX_FIXED_HDR
Size of fixed header without magic.
Definition: sox.h:25
AVCodecParameters::bit_rate
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:97
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
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