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/*
* Copyright (c) 2011 Mina Nagy Zaki
*
* 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
*/
/**
* @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 = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
#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}},
};
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