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/*
* Copyright (C) 2003-2013 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "ConvertFilterPlugin.hxx"
#include "filter_plugin.h"
#include "filter_internal.h"
#include "filter_registry.h"
#include "conf.h"
#include "PcmConvert.hxx"
#include "util/Manual.hxx"
#include "audio_format.h"
#include "poison.h"
#include <assert.h>
#include <string.h>
struct ConvertFilter {
struct filter base;
/**
* The input audio format; PCM data is passed to the filter()
* method in this format.
*/
struct audio_format in_audio_format;
/**
* The output audio format; the consumer of this plugin
* expects PCM data in this format. This defaults to
* #in_audio_format, and can be set with convert_filter_set().
*/
struct audio_format out_audio_format;
Manual<PcmConvert> state;
ConvertFilter() {
filter_init(&base, &convert_filter_plugin);
}
};
static struct filter *
convert_filter_init(gcc_unused const struct config_param *param,
gcc_unused GError **error_r)
{
ConvertFilter *filter = new ConvertFilter();
return &filter->base;
}
static void
convert_filter_finish(struct filter *filter)
{
delete filter;
}
static const struct audio_format *
convert_filter_open(struct filter *_filter, struct audio_format *audio_format,
gcc_unused GError **error_r)
{
ConvertFilter *filter = (ConvertFilter *)_filter;
assert(audio_format_valid(audio_format));
filter->in_audio_format = filter->out_audio_format = *audio_format;
filter->state.Construct();
return &filter->in_audio_format;
}
static void
convert_filter_close(struct filter *_filter)
{
ConvertFilter *filter = (ConvertFilter *)_filter;
filter->state.Destruct();
poison_undefined(&filter->in_audio_format,
sizeof(filter->in_audio_format));
poison_undefined(&filter->out_audio_format,
sizeof(filter->out_audio_format));
}
static const void *
convert_filter_filter(struct filter *_filter, const void *src, size_t src_size,
size_t *dest_size_r, GError **error_r)
{
ConvertFilter *filter = (ConvertFilter *)_filter;
const void *dest;
if (audio_format_equals(&filter->in_audio_format,
&filter->out_audio_format)) {
/* optimized special case: no-op */
*dest_size_r = src_size;
return src;
}
dest = filter->state->Convert(&filter->in_audio_format,
src, src_size,
&filter->out_audio_format, dest_size_r,
error_r);
if (dest == NULL)
return NULL;
return dest;
}
const struct filter_plugin convert_filter_plugin = {
"convert",
convert_filter_init,
convert_filter_finish,
convert_filter_open,
convert_filter_close,
convert_filter_filter,
};
void
convert_filter_set(struct filter *_filter,
const struct audio_format *out_audio_format)
{
ConvertFilter *filter = (ConvertFilter *)_filter;
assert(filter != NULL);
assert(audio_format_valid(&filter->in_audio_format));
assert(audio_format_valid(&filter->out_audio_format));
assert(out_audio_format != NULL);
assert(audio_format_valid(out_audio_format));
filter->out_audio_format = *out_audio_format;
}
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