FFmpeg  4.4.4
pcmdec.c
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1 /*
2  * RAW PCM demuxers
3  * Copyright (c) 2002 Fabrice Bellard
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/avstring.h"
23 #include "avformat.h"
24 #include "internal.h"
25 #include "pcm.h"
26 #include "libavutil/log.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/avassert.h"
29 
30 typedef struct PCMAudioDemuxerContext {
31  AVClass *class;
33  int channels;
35 
37 {
38  PCMAudioDemuxerContext *s1 = s->priv_data;
39  AVCodecParameters *par;
40  AVStream *st;
41  uint8_t *mime_type = NULL;
42 
43  st = avformat_new_stream(s, NULL);
44  if (!st)
45  return AVERROR(ENOMEM);
46  par = st->codecpar;
47 
49  par->codec_id = s->iformat->raw_codec_id;
50  par->sample_rate = s1->sample_rate;
51  par->channels = s1->channels;
52 
53  av_opt_get(s->pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &mime_type);
54  if (mime_type && s->iformat->mime_type) {
55  int rate = 0, channels = 0, little_endian = 0;
56  const char *options;
57  if (av_stristart(mime_type, s->iformat->mime_type, &options)) { /* audio/L16 */
58  while (options = strchr(options, ';')) {
59  options++;
60  if (!rate)
61  sscanf(options, " rate=%d", &rate);
62  if (!channels)
63  sscanf(options, " channels=%d", &channels);
64  if (!little_endian) {
65  char val[sizeof("little-endian")];
66  if (sscanf(options, " endianness=%13s", val) == 1) {
67  little_endian = strcmp(val, "little-endian") == 0;
68  }
69  }
70  }
71  if (rate <= 0) {
73  "Invalid sample_rate found in mime_type \"%s\"\n",
74  mime_type);
75  av_freep(&mime_type);
76  return AVERROR_INVALIDDATA;
77  }
78  par->sample_rate = rate;
79  if (channels > 0)
80  par->channels = channels;
81  if (little_endian)
83  }
84  }
85  av_freep(&mime_type);
86 
88 
90 
91  par->block_align = par->bits_per_coded_sample * par->channels / 8;
92 
93  avpriv_set_pts_info(st, 64, 1, par->sample_rate);
94  return 0;
95 }
96 
97 static const AVOption pcm_options[] = {
98  { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 44100}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
99  { "channels", "", offsetof(PCMAudioDemuxerContext, channels), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
100  { NULL },
101 };
102 
103 #define PCMDEF_0(name_, long_name_, ext, codec, ...)
104 #define PCMDEF_1(name_, long_name_, ext, codec, ...) \
105 static const AVClass name_ ## _demuxer_class = { \
106  .class_name = #name_ " demuxer", \
107  .item_name = av_default_item_name, \
108  .option = pcm_options, \
109  .version = LIBAVUTIL_VERSION_INT, \
110 }; \
111 AVInputFormat ff_pcm_ ## name_ ## _demuxer = { \
112  .name = #name_, \
113  .long_name = NULL_IF_CONFIG_SMALL(long_name_), \
114  .priv_data_size = sizeof(PCMAudioDemuxerContext), \
115  .read_header = pcm_read_header, \
116  .read_packet = ff_pcm_read_packet, \
117  .read_seek = ff_pcm_read_seek, \
118  .flags = AVFMT_GENERIC_INDEX, \
119  .extensions = ext, \
120  .raw_codec_id = codec, \
121  .priv_class = &name_ ## _demuxer_class, \
122  __VA_ARGS__ \
123 };
124 #define PCMDEF_2(name, long_name, ext, codec, enabled, ...) \
125  PCMDEF_ ## enabled(name, long_name, ext, codec, __VA_ARGS__)
126 #define PCMDEF_3(name, long_name, ext, codec, config, ...) \
127  PCMDEF_2(name, long_name, ext, codec, config, __VA_ARGS__)
128 #define PCMDEF_EXT(name, long_name, ext, uppercase, ...) \
129  PCMDEF_3(name, long_name, ext, AV_CODEC_ID_PCM_ ## uppercase, \
130  CONFIG_PCM_ ## uppercase ## _DEMUXER, __VA_ARGS__)
131 #define PCMDEF(name, long_name, ext, uppercase) \
132  PCMDEF_EXT(name, long_name, ext, uppercase, )
133 
134 PCMDEF(f64be, "PCM 64-bit floating-point big-endian", NULL, F64BE)
135 PCMDEF(f64le, "PCM 64-bit floating-point little-endian", NULL, F64LE)
136 PCMDEF(f32be, "PCM 32-bit floating-point big-endian", NULL, F32BE)
137 PCMDEF(f32le, "PCM 32-bit floating-point little-endian", NULL, F32LE)
138 PCMDEF(s32be, "PCM signed 32-bit big-endian", NULL, S32BE)
139 PCMDEF(s32le, "PCM signed 32-bit little-endian", NULL, S32LE)
140 PCMDEF(s24be, "PCM signed 24-bit big-endian", NULL, S24BE)
141 PCMDEF(s24le, "PCM signed 24-bit little-endian", NULL, S24LE)
142 PCMDEF_EXT(s16be, "PCM signed 16-bit big-endian",
143  AV_NE("sw", NULL), S16BE, .mime_type = "audio/L16")
144 PCMDEF(s16le, "PCM signed 16-bit little-endian", AV_NE(NULL, "sw"), S16LE)
145 PCMDEF(s8, "PCM signed 8-bit", "sb", S8)
146 PCMDEF(u32be, "PCM unsigned 32-bit big-endian", NULL, U32BE)
147 PCMDEF(u32le, "PCM unsigned 32-bit little-endian", NULL, U32LE)
148 PCMDEF(u24be, "PCM unsigned 24-bit big-endian", NULL, U24BE)
149 PCMDEF(u24le, "PCM unsigned 24-bit little-endian", NULL, U24LE)
150 PCMDEF(u16be, "PCM unsigned 16-bit big-endian", AV_NE("uw", NULL), U16BE)
151 PCMDEF(u16le, "PCM unsigned 16-bit little-endian", AV_NE(NULL, "uw"), U16LE)
152 PCMDEF(u8, "PCM unsigned 8-bit", "ub", U8)
153 PCMDEF(alaw, "PCM A-law", "al", ALAW)
154 PCMDEF(mulaw, "PCM mu-law", "ul", MULAW)
155 PCMDEF(vidc, "PCM Archimedes VIDC", NULL, VIDC)
156 
157 #if CONFIG_SLN_DEMUXER
158 static const AVOption sln_options[] = {
159  { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 8000}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
160  { "channels", "", offsetof(PCMAudioDemuxerContext, channels), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
161  { NULL },
162 };
163 
164 static const AVClass sln_demuxer_class = {
165  .class_name = "sln demuxer",
166  .item_name = av_default_item_name,
167  .option = sln_options,
168  .version = LIBAVUTIL_VERSION_INT,
169 };
170 
172  .name = "sln",
173  .long_name = NULL_IF_CONFIG_SMALL("Asterisk raw pcm"),
174  .priv_data_size = sizeof(PCMAudioDemuxerContext),
179  .extensions = "sln",
180  .raw_codec_id = AV_CODEC_ID_PCM_S16LE,
181  .priv_class = &sln_demuxer_class,
182 };
183 #endif
static double val(void *priv, double ch)
Definition: aeval.c:76
AVInputFormat ff_sln_demuxer
channels
Definition: aptx.h:33
#define A(x)
Definition: vp56_arith.h:28
uint8_t
simple assert() macros that are a bit more flexible than ISO C assert().
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
Main libavformat public API header.
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:463
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
#define PCM(format)
Definition: avisynth.c:49
static const uint32_t S8[256]
Definition: cast5.c:324
#define flags(name, subs,...)
Definition: cbs_av1.c:561
#define ub(width, name)
Definition: cbs_h2645.c:266
#define bit(string, value)
Definition: cbs_mpeg2.c:58
#define s(width, name)
Definition: cbs_vp9.c:257
#define AV_NE(be, le)
Definition: common.h:50
#define NULL
Definition: coverity.c:32
const OptionDef options[]
sample_rate
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:545
#define AV_OPT_SEARCH_CHILDREN
Search in possible children of the given object first.
Definition: opt.h:560
@ AV_OPT_TYPE_INT
Definition: opt.h:225
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:313
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:636
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4509
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AVERROR(e)
Definition: error.h:43
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
int av_stristart(const char *str, const char *pfx, const char **ptr)
Return non-zero if pfx is a prefix of str independent of case.
Definition: avstring.c:45
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
int av_opt_get(void *obj, const char *name, int search_flags, uint8_t **out_val)
Definition: opt.c:779
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:4945
int ff_pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: pcm.c:29
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:56
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
AVOptions.
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
Definition: opt.h:279
#define PCMDEF(name, long_name, ext, uppercase)
Definition: pcmdec.c:131
static int pcm_read_header(AVFormatContext *s)
Definition: pcmdec.c:36
static const AVOption pcm_options[]
Definition: pcmdec.c:97
#define PCMDEF_EXT(name, long_name, ext, uppercase,...)
Definition: pcmdec.c:128
#define s1
Definition: regdef.h:38
Describe the class of an AVClass context structure.
Definition: log.h:67
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
int channels
Audio only.
Definition: codec_par.h:166
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
int block_align
Audio only.
Definition: codec_par.h:177
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int sample_rate
Audio only.
Definition: codec_par.h:170
Format I/O context.
Definition: avformat.h:1232
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
AVOption.
Definition: opt.h:248
Stream structure.
Definition: avformat.h:873
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
#define av_freep(p)
#define av_log(a,...)