Libav
pcmdec.c
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1 /*
2  * RAW PCM demuxers
3  * Copyright (c) 2002 Fabrice Bellard
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; 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 
28 #define RAW_SAMPLES 1024
29 
30 typedef struct PCMAudioDemuxerContext {
31  AVClass *class;
33  int channels;
35 
37 {
39  AVStream *st;
40 
41  st = avformat_new_stream(s, NULL);
42  if (!st)
43  return AVERROR(ENOMEM);
44 
45 
48  st->codec->sample_rate = s1->sample_rate;
49  st->codec->channels = s1->channels;
50 
53 
54  assert(st->codec->bits_per_coded_sample > 0);
55 
56  st->codec->block_align =
57  st->codec->bits_per_coded_sample * st->codec->channels / 8;
58 
59  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
60  return 0;
61 }
62 
64 {
65  int ret, size, bps;
66  // AVStream *st = s->streams[0];
67 
68  size= RAW_SAMPLES*s->streams[0]->codec->block_align;
69 
70  ret= av_get_packet(s->pb, pkt, size);
71 
72  pkt->stream_index = 0;
73  if (ret < 0)
74  return ret;
75 
77  if (!bps) {
78  av_log(s, AV_LOG_ERROR, "Unknown number of bytes per sample.\n");
79  return AVERROR(EINVAL);
80  }
81 
82  pkt->dts=
83  pkt->pts= pkt->pos*8 / (bps * s->streams[0]->codec->channels);
84 
85  return ret;
86 }
87 
88 static const AVOption pcm_options[] = {
89  { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
90  { "channels", "", offsetof(PCMAudioDemuxerContext, channels), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
91  { NULL },
92 };
93 
94 #define PCMDEF(name_, long_name_, ext, codec) \
95 static const AVClass name_ ## _demuxer_class = { \
96  .class_name = #name_ " demuxer", \
97  .item_name = av_default_item_name, \
98  .option = pcm_options, \
99  .version = LIBAVUTIL_VERSION_INT, \
100 }; \
101 AVInputFormat ff_pcm_ ## name_ ## _demuxer = { \
102  .name = #name_, \
103  .long_name = NULL_IF_CONFIG_SMALL(long_name_), \
104  .priv_data_size = sizeof(PCMAudioDemuxerContext), \
105  .read_header = pcm_read_header, \
106  .read_packet = pcm_read_packet, \
107  .read_seek = ff_pcm_read_seek, \
108  .flags = AVFMT_GENERIC_INDEX, \
109  .extensions = ext, \
110  .raw_codec_id = codec, \
111  .priv_class = &name_ ## _demuxer_class, \
112 };
113 
114 PCMDEF(f64be, "PCM 64-bit floating-point big-endian",
116 
117 PCMDEF(f64le, "PCM 64-bit floating-point little-endian",
119 
120 PCMDEF(f32be, "PCM 32-bit floating-point big-endian",
121  NULL, AV_CODEC_ID_PCM_F32BE)
122 
123 PCMDEF(f32le, "PCM 32-bit floating-point little-endian",
124  NULL, AV_CODEC_ID_PCM_F32LE)
125 
126 PCMDEF(s32be, "PCM signed 32-bit big-endian",
127  NULL, AV_CODEC_ID_PCM_S32BE)
128 
129 PCMDEF(s32le, "PCM signed 32-bit little-endian",
130  NULL, AV_CODEC_ID_PCM_S32LE)
131 
132 PCMDEF(s24be, "PCM signed 24-bit big-endian",
133  NULL, AV_CODEC_ID_PCM_S24BE)
134 
135 PCMDEF(s24le, "PCM signed 24-bit little-endian",
136  NULL, AV_CODEC_ID_PCM_S24LE)
137 
138 PCMDEF(s16be, "PCM signed 16-bit big-endian",
139  AV_NE("sw", NULL), AV_CODEC_ID_PCM_S16BE)
140 
141 PCMDEF(s16le, "PCM signed 16-bit little-endian",
142  AV_NE(NULL, "sw"), AV_CODEC_ID_PCM_S16LE)
143 
144 PCMDEF(s8, "PCM signed 8-bit",
145  "sb", AV_CODEC_ID_PCM_S8)
146 
147 PCMDEF(u32be, "PCM unsigned 32-bit big-endian",
148  NULL, AV_CODEC_ID_PCM_U32BE)
149 
150 PCMDEF(u32le, "PCM unsigned 32-bit little-endian",
151  NULL, AV_CODEC_ID_PCM_U32LE)
152 
153 PCMDEF(u24be, "PCM unsigned 24-bit big-endian",
154  NULL, AV_CODEC_ID_PCM_U24BE)
155 
156 PCMDEF(u24le, "PCM unsigned 24-bit little-endian",
157  NULL, AV_CODEC_ID_PCM_U24LE)
158 
159 PCMDEF(u16be, "PCM unsigned 16-bit big-endian",
160  AV_NE("uw", NULL), AV_CODEC_ID_PCM_U16BE)
161 
162 PCMDEF(u16le, "PCM unsigned 16-bit little-endian",
163  AV_NE(NULL, "uw"), AV_CODEC_ID_PCM_U16LE)
164 
165 PCMDEF(u8, "PCM unsigned 8-bit",
166  "ub", AV_CODEC_ID_PCM_U8)
167 
168 PCMDEF(alaw, "PCM A-law",
169  "al", AV_CODEC_ID_PCM_ALAW)
170 
171 PCMDEF(mulaw, "PCM mu-law",
172  "ul", AV_CODEC_ID_PCM_MULAW)
int size
AVOption.
Definition: opt.h:234
static int pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: pcmdec.c:63
#define PCMDEF(name_, long_name_, ext, codec)
Definition: pcmdec.c:94
static int pcm_read_header(AVFormatContext *s)
Definition: pcmdec.c:36
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:998
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:2829
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:1844
Format I/O context.
Definition: avformat.h:922
AVOptions.
#define AV_NE(be, le)
Definition: common.h:45
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:2521
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:990
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:117
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2523
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:2055
#define AVERROR(e)
Definition: error.h:43
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:169
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:718
static const AVOption pcm_options[]
Definition: pcmdec.c:88
Stream structure.
Definition: avformat.h:699
NULL
Definition: eval.c:55
enum AVMediaType codec_type
Definition: avcodec.h:1058
enum AVCodecID codec_id
Definition: avcodec.h:1067
int sample_rate
samples per second
Definition: avcodec.h:1807
AVIOContext * pb
I/O context.
Definition: avformat.h:964
Describe the class of an AVClass context structure.
Definition: log.h:33
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
Definition: opt.h:265
Definition: vf_drawbox.c:37
int raw_codec_id
Raw demuxers store their codec ID here.
Definition: avformat.h:571
Main libavformat public API header.
unsigned bps
Definition: movenc.c:845
struct AVInputFormat * iformat
The input container format.
Definition: avformat.h:934
int channels
number of audio channels
Definition: avcodec.h:1808
void * priv_data
Format private data.
Definition: avformat.h:950
#define RAW_SAMPLES
Definition: pcmdec.c:28
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:972
int stream_index
Definition: avcodec.h:975
This structure stores compressed data.
Definition: avcodec.h:950
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:966