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
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
|
/*
* RAW PCM demuxers
* Copyright (c) 2002 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config_components.h"
#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "avformat.h"
#include "demux.h"
#include "internal.h"
#include "pcm.h"
#include "libavutil/log.h"
#include "libavutil/opt.h"
#include "libavutil/avassert.h"
typedef struct PCMAudioDemuxerContext {
AVClass *class;
int sample_rate;
AVChannelLayout ch_layout;
} PCMAudioDemuxerContext;
static int pcm_read_header(AVFormatContext *s)
{
PCMAudioDemuxerContext *s1 = s->priv_data;
AVCodecParameters *par;
AVStream *st;
uint8_t *mime_type = NULL;
int ret;
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
par = st->codecpar;
par->codec_type = AVMEDIA_TYPE_AUDIO;
par->codec_id = ffifmt(s->iformat)->raw_codec_id;
par->sample_rate = s1->sample_rate;
ret = av_channel_layout_copy(&par->ch_layout, &s1->ch_layout);
if (ret < 0)
return ret;
av_opt_get(s->pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &mime_type);
if (mime_type && s->iformat->mime_type) {
int rate = 0, channels = 0, little_endian = 0;
const char *options;
if (av_stristart(mime_type, s->iformat->mime_type, &options)) { /* audio/L16 */
while (options = strchr(options, ';')) {
options++;
if (!rate)
sscanf(options, " rate=%d", &rate);
if (!channels)
sscanf(options, " channels=%d", &channels);
if (!little_endian) {
char val[sizeof("little-endian")];
if (sscanf(options, " endianness=%13s", val) == 1) {
little_endian = strcmp(val, "little-endian") == 0;
}
}
}
if (rate <= 0) {
av_log(s, AV_LOG_ERROR,
"Invalid sample_rate found in mime_type \"%s\"\n",
mime_type);
av_freep(&mime_type);
return AVERROR_INVALIDDATA;
}
par->sample_rate = rate;
if (channels > 0) {
av_channel_layout_uninit(&par->ch_layout);
par->ch_layout.nb_channels = channels;
}
if (little_endian)
par->codec_id = AV_CODEC_ID_PCM_S16LE;
}
}
av_freep(&mime_type);
par->bits_per_coded_sample = av_get_bits_per_sample(par->codec_id);
av_assert0(par->bits_per_coded_sample > 0);
par->block_align = par->bits_per_coded_sample * par->ch_layout.nb_channels / 8;
avpriv_set_pts_info(st, 64, 1, par->sample_rate);
return 0;
}
static const AVOption pcm_options[] = {
{ "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 44100}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
{ "ch_layout", "", offsetof(PCMAudioDemuxerContext, ch_layout), AV_OPT_TYPE_CHLAYOUT, {.str = "mono"}, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
{ NULL },
};
static const AVClass pcm_demuxer_class = {
.class_name = "pcm demuxer",
.item_name = av_default_item_name,
.option = pcm_options,
.version = LIBAVUTIL_VERSION_INT,
};
#define PCMDEF_0(name_, long_name_, ext, codec, ...)
#define PCMDEF_1(name_, long_name_, ext, codec, ...) \
const FFInputFormat ff_pcm_ ## name_ ## _demuxer = { \
.p.name = #name_, \
.p.long_name = NULL_IF_CONFIG_SMALL(long_name_), \
.p.flags = AVFMT_GENERIC_INDEX, \
.p.extensions = ext, \
.p.priv_class = &pcm_demuxer_class, \
.priv_data_size = sizeof(PCMAudioDemuxerContext), \
.read_header = pcm_read_header, \
.read_packet = ff_pcm_read_packet, \
.read_seek = ff_pcm_read_seek, \
.raw_codec_id = codec, \
__VA_ARGS__ \
};
#define PCMDEF_2(name, long_name, ext, codec, enabled, ...) \
PCMDEF_ ## enabled(name, long_name, ext, codec, __VA_ARGS__)
#define PCMDEF_3(name, long_name, ext, codec, config, ...) \
PCMDEF_2(name, long_name, ext, codec, config, __VA_ARGS__)
#define PCMDEF_EXT(name, long_name, ext, uppercase, ...) \
PCMDEF_3(name, long_name, ext, AV_CODEC_ID_PCM_ ## uppercase, \
CONFIG_PCM_ ## uppercase ## _DEMUXER, __VA_ARGS__)
#define PCMDEF(name, long_name, ext, uppercase) \
PCMDEF_EXT(name, long_name, ext, uppercase, )
PCMDEF(f64be, "PCM 64-bit floating-point big-endian", NULL, F64BE)
PCMDEF(f64le, "PCM 64-bit floating-point little-endian", NULL, F64LE)
PCMDEF(f32be, "PCM 32-bit floating-point big-endian", NULL, F32BE)
PCMDEF(f32le, "PCM 32-bit floating-point little-endian", NULL, F32LE)
PCMDEF(s32be, "PCM signed 32-bit big-endian", NULL, S32BE)
PCMDEF(s32le, "PCM signed 32-bit little-endian", NULL, S32LE)
PCMDEF(s24be, "PCM signed 24-bit big-endian", NULL, S24BE)
PCMDEF(s24le, "PCM signed 24-bit little-endian", NULL, S24LE)
PCMDEF_EXT(s16be, "PCM signed 16-bit big-endian",
AV_NE("sw", NULL), S16BE, .p.mime_type = "audio/L16")
PCMDEF(s16le, "PCM signed 16-bit little-endian", AV_NE(NULL, "sw"), S16LE)
PCMDEF(s8, "PCM signed 8-bit", "sb", S8)
PCMDEF(u32be, "PCM unsigned 32-bit big-endian", NULL, U32BE)
PCMDEF(u32le, "PCM unsigned 32-bit little-endian", NULL, U32LE)
PCMDEF(u24be, "PCM unsigned 24-bit big-endian", NULL, U24BE)
PCMDEF(u24le, "PCM unsigned 24-bit little-endian", NULL, U24LE)
PCMDEF(u16be, "PCM unsigned 16-bit big-endian", AV_NE("uw", NULL), U16BE)
PCMDEF(u16le, "PCM unsigned 16-bit little-endian", AV_NE(NULL, "uw"), U16LE)
PCMDEF(u8, "PCM unsigned 8-bit", "ub", U8)
PCMDEF(alaw, "PCM A-law", "al", ALAW)
PCMDEF(mulaw, "PCM mu-law", "ul", MULAW)
PCMDEF(vidc, "PCM Archimedes VIDC", NULL, VIDC)
#if CONFIG_SLN_DEMUXER
static const AVOption sln_options[] = {
{ "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 8000}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
{ "ch_layout", "", offsetof(PCMAudioDemuxerContext, ch_layout), AV_OPT_TYPE_CHLAYOUT, {.str = "mono"}, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
{ NULL },
};
static const AVClass sln_demuxer_class = {
.class_name = "sln demuxer",
.item_name = av_default_item_name,
.option = sln_options,
.version = LIBAVUTIL_VERSION_INT,
};
const FFInputFormat ff_sln_demuxer = {
.p.name = "sln",
.p.long_name = NULL_IF_CONFIG_SMALL("Asterisk raw pcm"),
.p.flags = AVFMT_GENERIC_INDEX,
.p.extensions = "sln",
.p.priv_class = &sln_demuxer_class,
.priv_data_size = sizeof(PCMAudioDemuxerContext),
.read_header = pcm_read_header,
.read_packet = ff_pcm_read_packet,
.read_seek = ff_pcm_read_seek,
.raw_codec_id = AV_CODEC_ID_PCM_S16LE,
};
#endif
|
