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
|
/*
* Copyright (c) 2011 Mina Nagy Zaki
*
* 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
*/
/**
* @file
* format audio filter
*/
#include "libavutil/audioconvert.h"
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "audio.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
typedef struct AFormatContext {
const AVClass *class;
AVFilterFormats *formats;
AVFilterFormats *sample_rates;
AVFilterChannelLayouts *channel_layouts;
char *formats_str;
char *sample_rates_str;
char *channel_layouts_str;
} AFormatContext;
#define OFFSET(x) offsetof(AFormatContext, x)
#define A AV_OPT_FLAG_AUDIO_PARAM
static const AVOption options[] = {
{ "sample_fmts", "A comma-separated list of sample formats.", OFFSET(formats_str), AV_OPT_TYPE_STRING, .flags = A },
{ "sample_rates", "A comma-separated list of sample rates.", OFFSET(sample_rates_str), AV_OPT_TYPE_STRING, .flags = A },
{ "channel_layouts", "A comma-separated list of channel layouts.", OFFSET(channel_layouts_str), AV_OPT_TYPE_STRING, .flags = A },
{ NULL },
};
static const AVClass aformat_class = {
.class_name = "aformat filter",
.item_name = avfilter_default_filter_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
.category = AV_CLASS_CATEGORY_FILTER,
};
#define PARSE_FORMATS(str, type, list, add_to_list, get_fmt, none, desc) \
do { \
char *next, *cur = str; \
while (cur) { \
type fmt; \
next = strchr(cur, ','); \
if (next) \
*next++ = 0; \
\
if ((fmt = get_fmt(cur)) == none) { \
av_log(ctx, AV_LOG_ERROR, "Error parsing " desc ": %s.\n", cur);\
ret = AVERROR(EINVAL); \
goto fail; \
} \
add_to_list(&list, fmt); \
\
cur = next; \
} \
} while (0)
static int get_sample_rate(const char *samplerate)
{
int ret = strtol(samplerate, NULL, 0);
return FFMAX(ret, 0);
}
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
{
AFormatContext *s = ctx->priv;
int ret;
if (!args) {
av_log(ctx, AV_LOG_ERROR, "No parameters supplied.\n");
return AVERROR(EINVAL);
}
s->class = &aformat_class;
av_opt_set_defaults(s);
if ((ret = av_set_options_string(s, args, "=", ":")) < 0) {
av_log(ctx, AV_LOG_ERROR, "Error parsing options string '%s'.\n", args);
return ret;
}
PARSE_FORMATS(s->formats_str, enum AVSampleFormat, s->formats,
avfilter_add_format, av_get_sample_fmt, AV_SAMPLE_FMT_NONE, "sample format");
PARSE_FORMATS(s->sample_rates_str, int, s->sample_rates, avfilter_add_format,
get_sample_rate, 0, "sample rate");
PARSE_FORMATS(s->channel_layouts_str, uint64_t, s->channel_layouts,
ff_add_channel_layout, av_get_channel_layout, 0,
"channel layout");
fail:
av_opt_free(s);
return ret;
}
static int query_formats(AVFilterContext *ctx)
{
AFormatContext *s = ctx->priv;
avfilter_set_common_formats(ctx, s->formats ? s->formats :
avfilter_all_formats(AVMEDIA_TYPE_AUDIO));
ff_set_common_samplerates(ctx, s->sample_rates ? s->sample_rates :
ff_all_samplerates());
ff_set_common_channel_layouts(ctx, s->channel_layouts ? s->channel_layouts :
ff_all_channel_layouts());
return 0;
}
AVFilter avfilter_af_aformat = {
.name = "aformat",
.description = NULL_IF_CONFIG_SMALL("Convert the input audio to one of the specified formats."),
.init = init,
.query_formats = query_formats,
.priv_size = sizeof(AFormatContext),
.inputs = (AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.filter_samples = ff_null_filter_samples },
{ .name = NULL}},
.outputs = (AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_AUDIO},
{ .name = NULL}},
};
|
