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/*
* Copyright (C) 2003-2015 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 "filter/FilterPlugin.hxx"
#include "filter/FilterInternal.hxx"
#include "filter/FilterRegistry.hxx"
#include "pcm/PcmBuffer.hxx"
#include "AudioFormat.hxx"
#include "AudioCompress/compress.h"
#include "util/ConstBuffer.hxx"
#include <string.h>
class NormalizeFilter final : public Filter {
struct Compressor *compressor;
PcmBuffer buffer;
public:
/* virtual methods from class Filter */
AudioFormat Open(AudioFormat &af, Error &error) override;
void Close() override;
ConstBuffer<void> FilterPCM(ConstBuffer<void> src,
Error &error) override;
};
static Filter *
normalize_filter_init(gcc_unused const config_param ¶m,
gcc_unused Error &error)
{
return new NormalizeFilter();
}
AudioFormat
NormalizeFilter::Open(AudioFormat &audio_format, gcc_unused Error &error)
{
audio_format.format = SampleFormat::S16;
compressor = Compressor_new(0);
return audio_format;
}
void
NormalizeFilter::Close()
{
buffer.Clear();
Compressor_delete(compressor);
}
ConstBuffer<void>
NormalizeFilter::FilterPCM(ConstBuffer<void> src, gcc_unused Error &error)
{
int16_t *dest = (int16_t *)buffer.Get(src.size);
memcpy(dest, src.data, src.size);
Compressor_Process_int16(compressor, dest, src.size / 2);
return { (const void *)dest, src.size };
}
const struct filter_plugin normalize_filter_plugin = {
"normalize",
normalize_filter_init,
};
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