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  assert(bps); // if false there IS a bug elsewhere (NOT in this function)
78  pkt->dts=
79  pkt->pts= pkt->pos*8 / (bps * s->streams[0]->codec->channels);
80 
81  return ret;
82 }
83 
84 static const AVOption pcm_options[] = {
85  { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
86  { "channels", "", offsetof(PCMAudioDemuxerContext, channels), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
87  { NULL },
88 };
89 
90 #define PCMDEF(name_, long_name_, ext, codec) \
91 static const AVClass name_ ## _demuxer_class = { \
92  .class_name = #name_ " demuxer", \
93  .item_name = av_default_item_name, \
94  .option = pcm_options, \
95  .version = LIBAVUTIL_VERSION_INT, \
96 }; \
97 AVInputFormat ff_pcm_ ## name_ ## _demuxer = { \
98  .name = #name_, \
99  .long_name = NULL_IF_CONFIG_SMALL(long_name_), \
100  .priv_data_size = sizeof(PCMAudioDemuxerContext), \
101  .read_header = pcm_read_header, \
102  .read_packet = pcm_read_packet, \
103  .read_seek = ff_pcm_read_seek, \
104  .flags = AVFMT_GENERIC_INDEX, \
105  .extensions = ext, \
106  .raw_codec_id = codec, \
107  .priv_class = &name_ ## _demuxer_class, \
108 };
109 
110 PCMDEF(f64be, "PCM 64-bit floating-point big-endian",
112 
113 PCMDEF(f64le, "PCM 64-bit floating-point little-endian",
115 
116 PCMDEF(f32be, "PCM 32-bit floating-point big-endian",
117  NULL, AV_CODEC_ID_PCM_F32BE)
118 
119 PCMDEF(f32le, "PCM 32-bit floating-point little-endian",
120  NULL, AV_CODEC_ID_PCM_F32LE)
121 
122 PCMDEF(s32be, "PCM signed 32-bit big-endian",
123  NULL, AV_CODEC_ID_PCM_S32BE)
124 
125 PCMDEF(s32le, "PCM signed 32-bit little-endian",
126  NULL, AV_CODEC_ID_PCM_S32LE)
127 
128 PCMDEF(s24be, "PCM signed 24-bit big-endian",
129  NULL, AV_CODEC_ID_PCM_S24BE)
130 
131 PCMDEF(s24le, "PCM signed 24-bit little-endian",
132  NULL, AV_CODEC_ID_PCM_S24LE)
133 
134 PCMDEF(s16be, "PCM signed 16-bit big-endian",
135  AV_NE("sw", NULL), AV_CODEC_ID_PCM_S16BE)
136 
137 PCMDEF(s16le, "PCM signed 16-bit little-endian",
138  AV_NE(NULL, "sw"), AV_CODEC_ID_PCM_S16LE)
139 
140 PCMDEF(s8, "PCM signed 8-bit",
141  "sb", AV_CODEC_ID_PCM_S8)
142 
143 PCMDEF(u32be, "PCM unsigned 32-bit big-endian",
144  NULL, AV_CODEC_ID_PCM_U32BE)
145 
146 PCMDEF(u32le, "PCM unsigned 32-bit little-endian",
147  NULL, AV_CODEC_ID_PCM_U32LE)
148 
149 PCMDEF(u24be, "PCM unsigned 24-bit big-endian",
150  NULL, AV_CODEC_ID_PCM_U24BE)
151 
152 PCMDEF(u24le, "PCM unsigned 24-bit little-endian",
153  NULL, AV_CODEC_ID_PCM_U24LE)
154 
155 PCMDEF(u16be, "PCM unsigned 16-bit big-endian",
156  AV_NE("uw", NULL), AV_CODEC_ID_PCM_U16BE)
157 
158 PCMDEF(u16le, "PCM unsigned 16-bit little-endian",
159  AV_NE(NULL, "uw"), AV_CODEC_ID_PCM_U16LE)
160 
161 PCMDEF(u8, "PCM unsigned 8-bit",
162  "ub", AV_CODEC_ID_PCM_U8)
163 
164 PCMDEF(alaw, "PCM A-law",
165  "al", AV_CODEC_ID_PCM_ALAW)
166 
167 PCMDEF(mulaw, "PCM mu-law",
168  "ul", AV_CODEC_ID_PCM_MULAW)
int size
AVOption.
Definition: opt.h:233
static int pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: pcmdec.c:63
#define PCMDEF(name_, long_name_, ext, codec)
Definition: pcmdec.c:90
static int pcm_read_header(AVFormatContext *s)
Definition: pcmdec.c:36
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:940
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:3283
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:2141
Format I/O context.
Definition: avformat.h:828
AVOptions.
AVStream ** streams
Definition: avformat.h:876
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:218
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2704
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:1813
AVStream * avformat_new_stream(AVFormatContext *s, AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:2736
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:641
static const AVOption pcm_options[]
Definition: pcmdec.c:84
Stream structure.
Definition: avformat.h:622
NULL
Definition: eval.c:52
enum AVMediaType codec_type
Definition: avcodec.h:1347
enum AVCodecID codec_id
Definition: avcodec.h:1350
int sample_rate
samples per second
Definition: avcodec.h:2104
AVIOContext * pb
I/O context.
Definition: avformat.h:861
Describe the class of an AVClass context structure.
Definition: log.h:33
#define s1
Definition: regdef.h:38
int raw_codec_id
Raw demuxers store their codec ID here.
Definition: avformat.h:494
Main libavformat public API header.
struct PCMAudioDemuxerContext PCMAudioDemuxerContext
unsigned bps
Definition: movenc.c:803
struct AVInputFormat * iformat
Can only be iformat or oformat, not both at the same time.
Definition: avformat.h:841
int channels
number of audio channels
Definition: avcodec.h:2105
void * priv_data
Format private data.
Definition: avformat.h:848
#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:914
int stream_index
Definition: avcodec.h:917
Definition: vf_drawbox.c:36
This structure stores compressed data.
Definition: avcodec.h:898
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:908