FFmpeg: libavformat/pcmdec.c Source File

FFmpeg
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 "avformat.h"
23 #include "internal.h"
24 #include "pcm.h"
25 #include "libavutil/log.h"
26 #include "libavutil/opt.h"
27 #include "libavutil/avassert.h"
28 
29  typedef struct PCMAudioDemuxerContext {
30   AVClass *class;
31   int sample_rate;
32   int channels;
33 } PCMAudioDemuxerContext;
34 
35  static int pcm_read_header(AVFormatContext *s)
36 {
37  PCMAudioDemuxerContext *s1 = s->priv_data;
38  AVStream *st;
39 
40  st = avformat_new_stream(s, NULL);
41  if (!st)
42  return AVERROR(ENOMEM);
43 
44 
45  st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
46  st->codec->codec_id = s->iformat->raw_codec_id;
47  st->codec->sample_rate = s1->sample_rate;
48  st->codec->channels = s1->channels;
49 
50  st->codec->bits_per_coded_sample =
51  av_get_bits_per_sample(st->codec->codec_id);
52 
53  av_assert0(st->codec->bits_per_coded_sample > 0);
54 
55  st->codec->block_align =
56  st->codec->bits_per_coded_sample * st->codec->channels / 8;
57 
58  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
59  return 0;
60 }
61 
62  static const AVOption pcm_options[] = {
63  { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 44100}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
64  { "channels", "", offsetof(PCMAudioDemuxerContext, channels), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
65  { NULL },
66 };
67 
68  #define PCMDEF(name_, long_name_, ext, codec) \
69 static const AVClass name_ ## _demuxer_class = { \
70  .class_name = #name_ " demuxer", \
71  .item_name = av_default_item_name, \
72  .option = pcm_options, \
73  .version = LIBAVUTIL_VERSION_INT, \
74 }; \
75 AVInputFormat ff_pcm_ ## name_ ## _demuxer = { \
76  .name = #name_, \
77  .long_name = NULL_IF_CONFIG_SMALL(long_name_), \
78  .priv_data_size = sizeof(PCMAudioDemuxerContext), \
79  .read_header = pcm_read_header, \
80  .read_packet = ff_pcm_read_packet, \
81  .read_seek = ff_pcm_read_seek, \
82  .flags = AVFMT_GENERIC_INDEX, \
83  .extensions = ext, \
84  .raw_codec_id = codec, \
85  .priv_class = &name_ ## _demuxer_class, \
86 };
87 
88  PCMDEF(f64be, "PCM 64-bit floating-point big-endian",
89  NULL, AV_CODEC_ID_PCM_F64BE)
90 
91 PCMDEF(f64le, "PCM 64-bit floating-point little-endian",
92  NULL, AV_CODEC_ID_PCM_F64LE)
93 
94 PCMDEF(f32be, "PCM 32-bit floating-point big-endian",
95  NULL, AV_CODEC_ID_PCM_F32BE)
96 
97 PCMDEF(f32le, "PCM 32-bit floating-point little-endian",
98  NULL, AV_CODEC_ID_PCM_F32LE)
99 
100 PCMDEF(s32be, "PCM signed 32-bit big-endian",
101  NULL, AV_CODEC_ID_PCM_S32BE)
102 
103 PCMDEF(s32le, "PCM signed 32-bit little-endian",
104  NULL, AV_CODEC_ID_PCM_S32LE)
105 
106 PCMDEF(s24be, "PCM signed 24-bit big-endian",
107  NULL, AV_CODEC_ID_PCM_S24BE)
108 
109 PCMDEF(s24le, "PCM signed 24-bit little-endian",
110  NULL, AV_CODEC_ID_PCM_S24LE)
111 
112 PCMDEF(s16be, "PCM signed 16-bit big-endian",
113  AV_NE("sw", NULL), AV_CODEC_ID_PCM_S16BE)
114 
115 PCMDEF(s16le, "PCM signed 16-bit little-endian",
116  AV_NE(NULL, "sw"), AV_CODEC_ID_PCM_S16LE)
117 
118 PCMDEF(s8, "PCM signed 8-bit",
119  "sb", AV_CODEC_ID_PCM_S8)
120 
121 PCMDEF(u32be, "PCM unsigned 32-bit big-endian",
122  NULL, AV_CODEC_ID_PCM_U32BE)
123 
124 PCMDEF(u32le, "PCM unsigned 32-bit little-endian",
125  NULL, AV_CODEC_ID_PCM_U32LE)
126 
127 PCMDEF(u24be, "PCM unsigned 24-bit big-endian",
128  NULL, AV_CODEC_ID_PCM_U24BE)
129 
130 PCMDEF(u24le, "PCM unsigned 24-bit little-endian",
131  NULL, AV_CODEC_ID_PCM_U24LE)
132 
133 PCMDEF(u16be, "PCM unsigned 16-bit big-endian",
134  AV_NE("uw", NULL), AV_CODEC_ID_PCM_U16BE)
135 
136 PCMDEF(u16le, "PCM unsigned 16-bit little-endian",
137  AV_NE(NULL, "uw"), AV_CODEC_ID_PCM_U16LE)
138 
139 PCMDEF(u8, "PCM unsigned 8-bit",
140  "ub", AV_CODEC_ID_PCM_U8)
141 
142 PCMDEF(alaw, "PCM A-law",
143  "al", AV_CODEC_ID_PCM_ALAW)
144 
145 PCMDEF(mulaw, "PCM mu-law",
146  "ul", AV_CODEC_ID_PCM_MULAW)
147 
148 static const AVOption sln_options[] = {
149  { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 8000}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
150  { "channels", "", offsetof(PCMAudioDemuxerContext, channels), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
151  { NULL },
152 };
153 
154  static const AVClass sln_demuxer_class = {
155  .class_name = "sln demuxer",
156  .item_name = av_default_item_name,
157  .option = sln_options,
158  .version = LIBAVUTIL_VERSION_INT,
159 };
160 
161  AVInputFormat ff_sln_demuxer = {
162  .name = "sln",
163  .long_name = NULL_IF_CONFIG_SMALL("Asterisk raw pcm"),
164  .priv_data_size = sizeof(PCMAudioDemuxerContext),
165  .read_header = pcm_read_header,
166  .read_packet = ff_pcm_read_packet,
167  .read_seek = ff_pcm_read_seek,
168  .flags = AVFMT_GENERIC_INDEX,
169  .extensions = "sln",
170  .raw_codec_id = AV_CODEC_ID_PCM_S16LE,
171  .priv_class = &sln_demuxer_class,
172 };
AV_CODEC_ID_PCM_S24BE
Definition: avcodec.h:335
NULL
#define NULL
Definition: coverity.c:32
s
const char * s
Definition: avisynth_c.h:631
AV_CODEC_ID_PCM_S8
Definition: avcodec.h:326
AVOption
AVOption.
Definition: opt.h:245
AV_CODEC_ID_PCM_U16LE
Definition: avcodec.h:324
PCMDEF
#define PCMDEF(name_, long_name_, ext, codec)
Definition: pcmdec.c:68
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:70
pcm_read_header
static int pcm_read_header(AVFormatContext *s)
Definition: pcmdec.c:35
avpriv_set_pts_info
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:4149
AV_OPT_TYPE_INT
Definition: opt.h:223
read_seek
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
AVCodecContext::block_align
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:2324
AVFormatContext
Format I/O context.
Definition: avformat.h:1314
AVClass::class_name
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
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
opt.h
AVOptions.
AV_NE
#define AV_NE(be, le)
Definition: common.h:50
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3805
AV_CODEC_ID_PCM_U24LE
Definition: avcodec.h:336
AVCodecContext::bits_per_coded_sample
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2917
A
#define A(x)
Definition: vp56_arith.h:28
sln_demuxer_class
static const AVClass sln_demuxer_class
Definition: pcmdec.c:154
AV_CODEC_ID_PCM_ALAW
Definition: avcodec.h:329
av_get_bits_per_sample
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:3006
av_default_item_name
av_default_item_name
Definition: libopenh264enc.c:68
AVERROR
#define AVERROR(e)
Definition: error.h:43
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:176
AVMEDIA_TYPE_AUDIO
Definition: avutil.h:194
avassert.h
simple assert() macros that are a bit more flexible than ISO C assert().
AVStream::codec
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:896
pcm_options
static const AVOption pcm_options[]
Definition: pcmdec.c:62
AV_CODEC_ID_PCM_U24BE
Definition: avcodec.h:337
AV_CODEC_ID_PCM_U16BE
Definition: avcodec.h:325
AV_CODEC_ID_PCM_F64BE
Definition: avcodec.h:344
ff_pcm_read_seek
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:45
AV_CODEC_ID_PCM_S16BE
Definition: avcodec.h:323
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:638
AVStream
Stream structure.
Definition: avformat.h:877
AV_CODEC_ID_PCM_U8
Definition: avcodec.h:327
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
ff_pcm_read_packet
int ff_pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: pcm.c:29
sample_rate
sample_rate
Definition: ffmpeg_filter.c:190
AVCodecContext::codec_type
enum AVMediaType codec_type
Definition: avcodec.h:1540
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:1549
AVCodecContext::sample_rate
int sample_rate
samples per second
Definition: avcodec.h:2287
AV_CODEC_ID_PCM_MULAW
Definition: avcodec.h:328
AV_CODEC_ID_PCM_U32LE
Definition: avcodec.h:332
AV_CODEC_ID_PCM_F32BE
Definition: avcodec.h:342
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
AVFMT_GENERIC_INDEX
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:486
AV_OPT_FLAG_DECODING_PARAM
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
Definition: opt.h:276
AV_CODEC_ID_PCM_S24LE
Definition: avcodec.h:334
s1
#define s1
Definition: regdef.h:38
AV_CODEC_ID_PCM_F64LE
Definition: avcodec.h:345
AVInputFormat::raw_codec_id
int raw_codec_id
Raw demuxers store their codec ID here.
Definition: avformat.h:707
flags
static int flags
Definition: cpu.c:47
AV_CODEC_ID_PCM_F32LE
Definition: avcodec.h:343
avformat.h
Main libavformat public API header.
AV_CODEC_ID_PCM_U32BE
Definition: avcodec.h:333
AV_CODEC_ID_PCM_S16LE
Definition: avcodec.h:322
AVFormatContext::iformat
struct AVInputFormat * iformat
The input container format.
Definition: avformat.h:1326
AVCodecContext::channels
int channels
number of audio channels
Definition: avcodec.h:2288
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1342
ff_sln_demuxer
AVInputFormat ff_sln_demuxer
Definition: pcmdec.c:161
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:661
AV_CODEC_ID_PCM_S32LE
Definition: avcodec.h:330
AV_CODEC_ID_PCM_S32BE
Definition: avcodec.h:331
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