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libavfilter
af_aformat.c
Go to the documentation of this file.
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/*
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* Copyright (c) 2011 Mina Nagy Zaki
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* format audio filter
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*/
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#include "
libavutil/avstring.h
"
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#include "
libavutil/channel_layout.h
"
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#include "
libavutil/common.h
"
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#include "
libavutil/opt.h
"
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#include "
audio.h
"
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#include "
avfilter.h
"
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#include "
formats.h
"
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#include "
internal.h
"
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typedef
struct
AFormatContext
{
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const
AVClass
*
class
;
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AVFilterFormats
*
formats
;
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AVFilterFormats
*
sample_rates
;
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AVFilterChannelLayouts
*
channel_layouts
;
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char
*
formats_str
;
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char
*
sample_rates_str
;
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char
*
channel_layouts_str
;
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}
AFormatContext
;
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#define OFFSET(x) offsetof(AFormatContext, x)
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#define A AV_OPT_FLAG_AUDIO_PARAM
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#define F AV_OPT_FLAG_FILTERING_PARAM
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static
const
AVOption
aformat_options
[] = {
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{
"sample_fmts"
,
"A comma-separated list of sample formats."
,
OFFSET
(formats_str),
AV_OPT_TYPE_STRING
, .flags =
A
|
F
},
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{
"sample_rates"
,
"A comma-separated list of sample rates."
,
OFFSET
(sample_rates_str),
AV_OPT_TYPE_STRING
, .flags =
A
|
F
},
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{
"channel_layouts"
,
"A comma-separated list of channel layouts."
,
OFFSET
(channel_layouts_str),
AV_OPT_TYPE_STRING
, .flags =
A
|
F
},
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{ NULL },
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};
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AVFILTER_DEFINE_CLASS
(aformat);
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#define PARSE_FORMATS(str, type, list, add_to_list, get_fmt, none, desc) \
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do { \
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char *next, *cur = str, sep; \
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\
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if (str && strchr(str, ',')) { \
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av_log(ctx, AV_LOG_WARNING, "This syntax is deprecated, use '|' to "\
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"separate %s.\n", desc); \
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sep = ','; \
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} else \
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sep = '|'; \
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\
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while (cur) { \
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type fmt; \
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next = strchr(cur, sep); \
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if (next) \
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*next++ = 0; \
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\
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if ((fmt = get_fmt(cur)) == none) { \
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av_log(ctx, AV_LOG_ERROR, "Error parsing " desc ": %s.\n", cur);\
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return AVERROR(EINVAL); \
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} \
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add_to_list(&list, fmt); \
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\
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cur = next; \
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} \
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} while (0)
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static
int
get_sample_rate
(
const
char
*samplerate)
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{
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int
ret
= strtol(samplerate, NULL, 0);
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return
FFMAX
(ret, 0);
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}
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static
av_cold
int
init
(
AVFilterContext
*ctx)
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{
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AFormatContext
*
s
= ctx->
priv
;
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PARSE_FORMATS
(s->
formats_str
,
enum
AVSampleFormat
, s->
formats
,
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ff_add_format
,
av_get_sample_fmt
,
AV_SAMPLE_FMT_NONE
,
"sample format"
);
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PARSE_FORMATS
(s->
sample_rates_str
,
int
, s->
sample_rates
,
ff_add_format
,
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get_sample_rate
, 0,
"sample rate"
);
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PARSE_FORMATS
(s->
channel_layouts_str
, uint64_t, s->
channel_layouts
,
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ff_add_channel_layout
,
av_get_channel_layout
, 0,
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"channel layout"
);
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return
0;
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}
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static
int
query_formats
(
AVFilterContext
*ctx)
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{
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AFormatContext
*
s
= ctx->
priv
;
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ff_set_common_formats
(ctx, s->
formats
? s->
formats
:
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ff_all_formats
(
AVMEDIA_TYPE_AUDIO
));
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ff_set_common_samplerates
(ctx, s->
sample_rates
? s->
sample_rates
:
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ff_all_samplerates
());
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ff_set_common_channel_layouts
(ctx, s->
channel_layouts
? s->
channel_layouts
:
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ff_all_channel_counts
());
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return
0;
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}
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static
const
AVFilterPad
avfilter_af_aformat_inputs
[] = {
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{
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.
name
=
"default"
,
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.type =
AVMEDIA_TYPE_AUDIO
,
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},
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{ NULL }
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};
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static
const
AVFilterPad
avfilter_af_aformat_outputs
[] = {
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{
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.
name
=
"default"
,
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.type =
AVMEDIA_TYPE_AUDIO
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},
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{ NULL }
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};
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AVFilter
avfilter_af_aformat
= {
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.
name
=
"aformat"
,
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.description =
NULL_IF_CONFIG_SMALL
(
"Convert the input audio to one of the specified formats."
),
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.init =
init
,
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.query_formats =
query_formats
,
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.priv_size =
sizeof
(
AFormatContext
),
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.priv_class = &aformat_class,
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.
inputs
= avfilter_af_aformat_inputs,
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.
outputs
= avfilter_af_aformat_outputs,
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};
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1.8.2