1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
|
/*
* RAW PCM demuxers
* Copyright (c) 2002 Fabrice Bellard
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
#include "internal.h"
#include "pcm.h"
#include "libavutil/log.h"
#include "libavutil/opt.h"
#define RAW_SAMPLES 1024
typedef struct PCMAudioDemuxerContext {
AVClass *class;
int sample_rate;
int channels;
} PCMAudioDemuxerContext;
static int pcm_read_header(AVFormatContext *s)
{
PCMAudioDemuxerContext *s1 = s->priv_data;
AVStream *st;
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_id = s->iformat->raw_codec_id;
st->codec->sample_rate = s1->sample_rate;
st->codec->channels = s1->channels;
st->codec->bits_per_coded_sample =
av_get_bits_per_sample(st->codec->codec_id);
assert(st->codec->bits_per_coded_sample > 0);
st->codec->block_align =
st->codec->bits_per_coded_sample * st->codec->channels / 8;
avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
return 0;
}
static int pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret, size, bps;
// AVStream *st = s->streams[0];
size= RAW_SAMPLES*s->streams[0]->codec->block_align;
ret= av_get_packet(s->pb, pkt, size);
pkt->stream_index = 0;
if (ret < 0)
return ret;
bps= av_get_bits_per_sample(s->streams[0]->codec->codec_id);
assert(bps); // if false there IS a bug elsewhere (NOT in this function)
pkt->dts=
pkt->pts= pkt->pos*8 / (bps * s->streams[0]->codec->channels);
return ret;
}
static const AVOption pcm_options[] = {
{ "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
{ "channels", "", offsetof(PCMAudioDemuxerContext, channels), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
{ NULL },
};
#define PCMDEF(name_, long_name_, ext, codec) \
static const AVClass name_ ## _demuxer_class = { \
.class_name = #name_ " demuxer", \
.item_name = av_default_item_name, \
.option = pcm_options, \
.version = LIBAVUTIL_VERSION_INT, \
}; \
AVInputFormat ff_pcm_ ## name_ ## _demuxer = { \
.name = #name_, \
.long_name = NULL_IF_CONFIG_SMALL(long_name_), \
.priv_data_size = sizeof(PCMAudioDemuxerContext), \
.read_header = pcm_read_header, \
.read_packet = pcm_read_packet, \
.read_seek = ff_pcm_read_seek, \
.flags = AVFMT_GENERIC_INDEX, \
.extensions = ext, \
.raw_codec_id = codec, \
.priv_class = &name_ ## _demuxer_class, \
};
PCMDEF(f64be, "PCM 64-bit floating-point big-endian",
NULL, AV_CODEC_ID_PCM_F64BE)
PCMDEF(f64le, "PCM 64-bit floating-point little-endian",
NULL, AV_CODEC_ID_PCM_F64LE)
PCMDEF(f32be, "PCM 32-bit floating-point big-endian",
NULL, AV_CODEC_ID_PCM_F32BE)
PCMDEF(f32le, "PCM 32-bit floating-point little-endian",
NULL, AV_CODEC_ID_PCM_F32LE)
PCMDEF(s32be, "PCM signed 32-bit big-endian",
NULL, AV_CODEC_ID_PCM_S32BE)
PCMDEF(s32le, "PCM signed 32-bit little-endian",
NULL, AV_CODEC_ID_PCM_S32LE)
PCMDEF(s24be, "PCM signed 24-bit big-endian",
NULL, AV_CODEC_ID_PCM_S24BE)
PCMDEF(s24le, "PCM signed 24-bit little-endian",
NULL, AV_CODEC_ID_PCM_S24LE)
PCMDEF(s16be, "PCM signed 16-bit big-endian",
AV_NE("sw", NULL), AV_CODEC_ID_PCM_S16BE)
PCMDEF(s16le, "PCM signed 16-bit little-endian",
AV_NE(NULL, "sw"), AV_CODEC_ID_PCM_S16LE)
PCMDEF(s8, "PCM signed 8-bit",
"sb", AV_CODEC_ID_PCM_S8)
PCMDEF(u32be, "PCM unsigned 32-bit big-endian",
NULL, AV_CODEC_ID_PCM_U32BE)
PCMDEF(u32le, "PCM unsigned 32-bit little-endian",
NULL, AV_CODEC_ID_PCM_U32LE)
PCMDEF(u24be, "PCM unsigned 24-bit big-endian",
NULL, AV_CODEC_ID_PCM_U24BE)
PCMDEF(u24le, "PCM unsigned 24-bit little-endian",
NULL, AV_CODEC_ID_PCM_U24LE)
PCMDEF(u16be, "PCM unsigned 16-bit big-endian",
AV_NE("uw", NULL), AV_CODEC_ID_PCM_U16BE)
PCMDEF(u16le, "PCM unsigned 16-bit little-endian",
AV_NE(NULL, "uw"), AV_CODEC_ID_PCM_U16LE)
PCMDEF(u8, "PCM unsigned 8-bit",
"ub", AV_CODEC_ID_PCM_U8)
PCMDEF(alaw, "PCM A-law",
"al", AV_CODEC_ID_PCM_ALAW)
PCMDEF(mulaw, "PCM mu-law",
"ul", AV_CODEC_ID_PCM_MULAW)
|
