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;
32  int channels;
34 
36 {
38  AVStream *st;
39  uint8_t *mime_type = NULL;
40 
41  st = avformat_new_stream(s, NULL);
42  if (!st)
43  return AVERROR(ENOMEM);
44 
45 
48  st->codecpar->sample_rate = s1->sample_rate;
49  st->codecpar->channels = s1->channels;
50 
51  av_opt_get(s->pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &mime_type);
52  if (mime_type && s->iformat->mime_type) {
53  int rate = 0, channels = 0, little_endian = 0;
54  size_t len = strlen(s->iformat->mime_type);
55  if (!av_strncasecmp(s->iformat->mime_type, mime_type, len)) { /* audio/L16 */
56  uint8_t *options = mime_type + len;
57  len = strlen(mime_type);
58  while (options < mime_type + len) {
59  options = strstr(options, ";");
60  if (!options++)
61  break;
62  if (!rate)
63  sscanf(options, " rate=%d", &rate);
64  if (!channels)
65  sscanf(options, " channels=%d", &channels);
66  if (!little_endian) {
67  char val[14]; /* sizeof("little-endian") == 14 */
68  if (sscanf(options, " endianness=%13s", val) == 1) {
69  little_endian = strcmp(val, "little-endian") == 0;
70  }
71  }
72  }
73  if (rate <= 0) {
75  "Invalid sample_rate found in mime_type \"%s\"\n",
76  mime_type);
77  av_freep(&mime_type);
78  return AVERROR_INVALIDDATA;
79  }
80  st->codecpar->sample_rate = rate;
81  if (channels > 0)
82  st->codecpar->channels = channels;
83  if (little_endian)
85  }
86  }
87  av_freep(&mime_type);
88 
91 
93 
94  st->codecpar->block_align =
96 
97  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
98  return 0;
99 }
100 
101 static const AVOption pcm_options[] = {
102  { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 44100}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
103  { "channels", "", offsetof(PCMAudioDemuxerContext, channels), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
104  { NULL },
105 };
106 
107 #define PCMDEF(name_, long_name_, ext, codec, ...) \
108 static const AVClass name_ ## _demuxer_class = { \
109  .class_name = #name_ " demuxer", \
110  .item_name = av_default_item_name, \
111  .option = pcm_options, \
112  .version = LIBAVUTIL_VERSION_INT, \
113 }; \
114 AVInputFormat ff_pcm_ ## name_ ## _demuxer = { \
115  .name = #name_, \
116  .long_name = NULL_IF_CONFIG_SMALL(long_name_), \
117  .priv_data_size = sizeof(PCMAudioDemuxerContext), \
118  .read_header = pcm_read_header, \
119  .read_packet = ff_pcm_read_packet, \
120  .read_seek = ff_pcm_read_seek, \
121  .flags = AVFMT_GENERIC_INDEX, \
122  .extensions = ext, \
123  .raw_codec_id = codec, \
124  .priv_class = &name_ ## _demuxer_class, \
125  __VA_ARGS__ \
126 };
127 
128 PCMDEF(f64be, "PCM 64-bit floating-point big-endian",
130 
131 PCMDEF(f64le, "PCM 64-bit floating-point little-endian",
133 
134 PCMDEF(f32be, "PCM 32-bit floating-point big-endian",
135  NULL, AV_CODEC_ID_PCM_F32BE)
136 
137 PCMDEF(f32le, "PCM 32-bit floating-point little-endian",
138  NULL, AV_CODEC_ID_PCM_F32LE)
139 
140 PCMDEF(s32be, "PCM signed 32-bit big-endian",
141  NULL, AV_CODEC_ID_PCM_S32BE)
142 
143 PCMDEF(s32le, "PCM signed 32-bit little-endian",
144  NULL, AV_CODEC_ID_PCM_S32LE)
145 
146 PCMDEF(s24be, "PCM signed 24-bit big-endian",
147  NULL, AV_CODEC_ID_PCM_S24BE)
148 
149 PCMDEF(s24le, "PCM signed 24-bit little-endian",
150  NULL, AV_CODEC_ID_PCM_S24LE)
151 
152 PCMDEF(s16be, "PCM signed 16-bit big-endian",
153  AV_NE("sw", NULL), AV_CODEC_ID_PCM_S16BE, .mime_type = "audio/L16")
154 
155 PCMDEF(s16le, "PCM signed 16-bit little-endian",
156  AV_NE(NULL, "sw"), AV_CODEC_ID_PCM_S16LE)
157 
158 PCMDEF(s8, "PCM signed 8-bit",
159  "sb", AV_CODEC_ID_PCM_S8)
160 
161 PCMDEF(u32be, "PCM unsigned 32-bit big-endian",
162  NULL, AV_CODEC_ID_PCM_U32BE)
163 
164 PCMDEF(u32le, "PCM unsigned 32-bit little-endian",
165  NULL, AV_CODEC_ID_PCM_U32LE)
166 
167 PCMDEF(u24be, "PCM unsigned 24-bit big-endian",
168  NULL, AV_CODEC_ID_PCM_U24BE)
169 
170 PCMDEF(u24le, "PCM unsigned 24-bit little-endian",
171  NULL, AV_CODEC_ID_PCM_U24LE)
172 
173 PCMDEF(u16be, "PCM unsigned 16-bit big-endian",
174  AV_NE("uw", NULL), AV_CODEC_ID_PCM_U16BE)
175 
176 PCMDEF(u16le, "PCM unsigned 16-bit little-endian",
177  AV_NE(NULL, "uw"), AV_CODEC_ID_PCM_U16LE)
178 
179 PCMDEF(u8, "PCM unsigned 8-bit",
181 
182 PCMDEF(alaw, "PCM A-law",
183  "al", AV_CODEC_ID_PCM_ALAW)
184 
185 PCMDEF(mulaw, "PCM mu-law",
186  "ul", AV_CODEC_ID_PCM_MULAW)
187 
188 PCMDEF(vidc, "PCM Archimedes VIDC",
189  NULL, AV_CODEC_ID_PCM_VIDC)
190 
191 static const AVOption sln_options[] = {
192  { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 8000}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
193  { "channels", "", offsetof(PCMAudioDemuxerContext, channels), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
194  { NULL },
195 };
196 
197 static const AVClass sln_demuxer_class = {
198  .class_name = "sln demuxer",
199  .item_name = av_default_item_name,
200  .option = sln_options,
201  .version = LIBAVUTIL_VERSION_INT,
202 };
203 
205  .name = "sln",
206  .long_name = NULL_IF_CONFIG_SMALL("Asterisk raw pcm"),
207  .priv_data_size = sizeof(PCMAudioDemuxerContext),
212  .extensions = "sln",
213  .raw_codec_id = AV_CODEC_ID_PCM_S16LE,
214  .priv_class = &sln_demuxer_class,
215 };
#define NULL
Definition: coverity.c:32
const char const char void * val
Definition: avisynth_c.h:863
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
AVOption.
Definition: opt.h:246
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
static int pcm_read_header(AVFormatContext *s)
Definition: pcmdec.c:35
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:4929
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
channels
Definition: aptx.c:30
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3968
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
int av_strncasecmp(const char *a, const char *b, size_t n)
Locale-independent case-insensitive compare.
Definition: avstring.c:223
Format I/O context.
Definition: avformat.h:1358
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
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
uint8_t
AVOptions.
#define AV_NE(be, le)
Definition: common.h:50
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4502
#define A(x)
Definition: vp56_arith.h:28
#define av_log(a,...)
static const AVClass sln_demuxer_class
Definition: pcmdec.c:197
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:1533
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
ff_const59 struct AVInputFormat * iformat
The input container format.
Definition: avformat.h:1370
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3964
simple assert() macros that are a bit more flexible than ISO C assert().
static const AVOption pcm_options[]
Definition: pcmdec.c:101
int block_align
Audio only.
Definition: avcodec.h:4085
#define AV_OPT_SEARCH_CHILDREN
Search in possible children of the given object first.
Definition: opt.h:557
#define s(width, name)
Definition: cbs_vp9.c:257
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:52
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
Stream structure.
Definition: avformat.h:881
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
int ff_pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: pcm.c:29
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
#define ub(width, name)
Definition: cbs_h2645.c:254
Describe the class of an AVClass context structure.
Definition: log.h:67
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:468
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
Definition: opt.h:277
#define s1
Definition: regdef.h:38
#define PCMDEF(name_, long_name_, ext, codec,...)
Definition: pcmdec.c:107
int raw_codec_id
Raw demuxers store their codec ID here.
Definition: avformat.h:700
#define flags(name, subs,...)
Definition: cbs_av1.c:561
const char * mime_type
Comma-separated list of mime types.
Definition: avformat.h:686
int sample_rate
Audio only.
Definition: avcodec.h:4078
Main libavformat public API header.
const OptionDef options[]
Definition: ffmpeg_opt.c:3374
#define bit(string, value)
Definition: cbs_mpeg2.c:58
int av_opt_get(void *obj, const char *name, int search_flags, uint8_t **out_val)
Definition: opt.c:761
int len
void * priv_data
Format private data.
Definition: avformat.h:1386
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:4010
int channels
Audio only.
Definition: avcodec.h:4074
AVInputFormat ff_sln_demuxer
Definition: pcmdec.c:204
#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