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/*
* 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/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/common.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
#define F AV_OPT_FLAG_FILTERING_PARAM
static const AVOption aformat_options[] = {
{ "sample_fmts", "A '|'-separated list of sample formats.", OFFSET(formats_str), AV_OPT_TYPE_STRING, .flags = A|F },
{ "f", "A '|'-separated list of sample formats.", OFFSET(formats_str), AV_OPT_TYPE_STRING, .flags = A|F },
{ "sample_rates", "A '|'-separated list of sample rates.", OFFSET(sample_rates_str), AV_OPT_TYPE_STRING, .flags = A|F },
{ "r", "A '|'-separated list of sample rates.", OFFSET(sample_rates_str), AV_OPT_TYPE_STRING, .flags = A|F },
{ "channel_layouts", "A '|'-separated list of channel layouts.", OFFSET(channel_layouts_str), AV_OPT_TYPE_STRING, .flags = A|F },
{ "cl", "A '|'-separated list of channel layouts.", OFFSET(channel_layouts_str), AV_OPT_TYPE_STRING, .flags = A|F },
{ NULL }
};
AVFILTER_DEFINE_CLASS(aformat);
#define PARSE_FORMATS(str, type, list, add_to_list, get_fmt, none, desc) \
do { \
char *next, *cur = str; \
int ret; \
\
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);\
return AVERROR(EINVAL); \
} \
if ((ret = add_to_list(&list, fmt)) < 0) { \
return ret; \
} \
\
cur = next; \
} \
} while (0)
static int get_sample_rate(const char *samplerate)
{
int ret = strtol(samplerate, NULL, 0);
return FFMAX(ret, 0);
}
static int parse_channel_layouts(AVFilterContext *ctx)
{
AFormatContext *s = ctx->priv;
char *next, *cur = s->channel_layouts_str;
AVChannelLayout fmt = { 0 };
int ret;
while (cur) {
next = strchr(cur, '|');
if (next)
*next++ = 0;
ret = av_channel_layout_from_string(&fmt, cur);
if (ret < 0) {
av_log(ctx, AV_LOG_ERROR, "Error parsing channel layout: %s.\n", cur);
return AVERROR(EINVAL);
}
ret = ff_add_channel_layout(&s->channel_layouts, &fmt);
av_channel_layout_uninit(&fmt);
if (ret < 0)
return ret;
cur = next;
}
return 0;
}
static av_cold int init(AVFilterContext *ctx)
{
AFormatContext *s = ctx->priv;
int ret;
PARSE_FORMATS(s->formats_str, enum AVSampleFormat, s->formats,
ff_add_format, av_get_sample_fmt, AV_SAMPLE_FMT_NONE, "sample format");
PARSE_FORMATS(s->sample_rates_str, int, s->sample_rates, ff_add_format,
get_sample_rate, 0, "sample rate");
ret = parse_channel_layouts(ctx);
if (ret < 0)
return ret;
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
AFormatContext *s = ctx->priv;
ff_formats_unref(&s->formats);
ff_formats_unref(&s->sample_rates);
ff_channel_layouts_unref(&s->channel_layouts);
}
static int query_formats(AVFilterContext *ctx)
{
AFormatContext *s = ctx->priv;
int ret;
ret = ff_set_common_formats(ctx, s->formats ? s->formats :
ff_all_formats(AVMEDIA_TYPE_AUDIO));
s->formats = NULL;
if (ret < 0)
return ret;
ret = ff_set_common_samplerates(ctx, s->sample_rates ? s->sample_rates :
ff_all_samplerates());
s->sample_rates = NULL;
if (ret < 0)
return ret;
ret = ff_set_common_channel_layouts(ctx, s->channel_layouts ? s->channel_layouts :
ff_all_channel_counts());
s->channel_layouts = NULL;
return ret;
}
const AVFilter ff_af_aformat = {
.name = "aformat",
.description = NULL_IF_CONFIG_SMALL("Convert the input audio to one of the specified formats."),
.init = init,
.uninit = uninit,
.priv_size = sizeof(AFormatContext),
.priv_class = &aformat_class,
.flags = AVFILTER_FLAG_METADATA_ONLY,
FILTER_INPUTS(ff_audio_default_filterpad),
FILTER_OUTPUTS(ff_audio_default_filterpad),
FILTER_QUERY_FUNC(query_formats),
};
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