pcmdec.c
Go to the documentation of this file.
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 "rawdec.h"
24 #include "pcm.h"
25 #include "libavutil/log.h"
26 #include "libavutil/opt.h"
27 
28 #define RAW_SAMPLES 1024
29 
31 {
32  int ret, size, bps;
33  // AVStream *st = s->streams[0];
34 
35  size= RAW_SAMPLES*s->streams[0]->codec->block_align;
36 
37  ret= av_get_packet(s->pb, pkt, size);
38 
39  pkt->stream_index = 0;
40  if (ret < 0)
41  return ret;
42 
44  assert(bps); // if false there IS a bug elsewhere (NOT in this function)
45  pkt->dts=
46  pkt->pts= pkt->pos*8 / (bps * s->streams[0]->codec->channels);
47 
48  return ret;
49 }
50 
51 static const AVOption pcm_options[] = {
52  { "sample_rate", "", offsetof(RawAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
53  { "channels", "", offsetof(RawAudioDemuxerContext, channels), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
54  { NULL },
55 };
56 
57 #define PCMDEF(name_, long_name_, ext, codec) \
58 static const AVClass name_ ## _demuxer_class = { \
59  .class_name = #name_ " demuxer", \
60  .item_name = av_default_item_name, \
61  .option = pcm_options, \
62  .version = LIBAVUTIL_VERSION_INT, \
63 }; \
64 AVInputFormat ff_pcm_ ## name_ ## _demuxer = { \
65  .name = #name_, \
66  .long_name = NULL_IF_CONFIG_SMALL(long_name_), \
67  .priv_data_size = sizeof(RawAudioDemuxerContext), \
68  .read_header = ff_raw_read_header, \
69  .read_packet = raw_read_packet, \
70  .read_seek = pcm_read_seek, \
71  .flags = AVFMT_GENERIC_INDEX, \
72  .extensions = ext, \
73  .value = codec, \
74  .priv_class = &name_ ## _demuxer_class, \
75 };
76 
77 PCMDEF(f64be, "PCM 64 bit floating-point big-endian format",
79 
80 PCMDEF(f64le, "PCM 64 bit floating-point little-endian format",
82 
83 PCMDEF(f32be, "PCM 32 bit floating-point big-endian format",
84  NULL, CODEC_ID_PCM_F32BE)
85 
86 PCMDEF(f32le, "PCM 32 bit floating-point little-endian format",
87  NULL, CODEC_ID_PCM_F32LE)
88 
89 PCMDEF(s32be, "PCM signed 32 bit big-endian format",
90  NULL, CODEC_ID_PCM_S32BE)
91 
92 PCMDEF(s32le, "PCM signed 32 bit little-endian format",
93  NULL, CODEC_ID_PCM_S32LE)
94 
95 PCMDEF(s24be, "PCM signed 24 bit big-endian format",
96  NULL, CODEC_ID_PCM_S24BE)
97 
98 PCMDEF(s24le, "PCM signed 24 bit little-endian format",
99  NULL, CODEC_ID_PCM_S24LE)
100 
101 PCMDEF(s16be, "PCM signed 16 bit big-endian format",
102  AV_NE("sw", NULL), CODEC_ID_PCM_S16BE)
103 
104 PCMDEF(s16le, "PCM signed 16 bit little-endian format",
105  AV_NE(NULL, "sw"), CODEC_ID_PCM_S16LE)
106 
107 PCMDEF(s8, "PCM signed 8 bit format",
108  "sb", CODEC_ID_PCM_S8)
109 
110 PCMDEF(u32be, "PCM unsigned 32 bit big-endian format",
111  NULL, CODEC_ID_PCM_U32BE)
112 
113 PCMDEF(u32le, "PCM unsigned 32 bit little-endian format",
114  NULL, CODEC_ID_PCM_U32LE)
115 
116 PCMDEF(u24be, "PCM unsigned 24 bit big-endian format",
117  NULL, CODEC_ID_PCM_U24BE)
118 
119 PCMDEF(u24le, "PCM unsigned 24 bit little-endian format",
120  NULL, CODEC_ID_PCM_U24LE)
121 
122 PCMDEF(u16be, "PCM unsigned 16 bit big-endian format",
123  AV_NE("uw", NULL), CODEC_ID_PCM_U16BE)
124 
125 PCMDEF(u16le, "PCM unsigned 16 bit little-endian format",
126  AV_NE(NULL, "uw"), CODEC_ID_PCM_U16LE)
127 
128 PCMDEF(u8, "PCM unsigned 8 bit format",
129  "ub", CODEC_ID_PCM_U8)
130 
131 PCMDEF(alaw, "PCM A-law format",
132  "al", CODEC_ID_PCM_ALAW)
133 
134 PCMDEF(mulaw, "PCM mu-law format",
135  "ul", CODEC_ID_PCM_MULAW)