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/*
* Copyright (C) 2003-2014 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 "ReplayGainFilterPlugin.hxx"
#include "FilterPlugin.hxx"
#include "FilterInternal.hxx"
#include "FilterRegistry.hxx"
#include "AudioFormat.hxx"
#include "ReplayGainInfo.hxx"
#include "ReplayGainConfig.hxx"
#include "MixerControl.hxx"
#include "pcm/Volume.hxx"
#include "pcm/PcmBuffer.hxx"
#include "util/ConstBuffer.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"
#include "Log.hxx"
#include <assert.h>
#include <string.h>
static constexpr Domain replay_gain_domain("replay_gain");
class ReplayGainFilter final : public Filter {
/**
* If set, then this hardware mixer is used for applying
* replay gain, instead of the software volume library.
*/
Mixer *mixer;
/**
* The base volume level for scale=1.0, between 1 and 100
* (including).
*/
unsigned base;
ReplayGainMode mode;
ReplayGainInfo info;
/**
* About the current volume: it is between 0 and a value that
* may or may not exceed #PCM_VOLUME_1.
*
* If the default value of true is used for replaygain_limit, the
* application of the volume to the signal will never cause clipping.
*
* On the other hand, if the user has set replaygain_limit to false,
* the chance of clipping is explicitly preferred if that's required to
* maintain a consistent audio level. Whether clipping will actually
* occur depends on what value the user is using for replaygain_preamp.
*/
PcmVolume pv;
public:
ReplayGainFilter()
:mixer(nullptr), mode(REPLAY_GAIN_OFF) {
info.Clear();
}
void SetMixer(Mixer *_mixer, unsigned _base) {
assert(_mixer == nullptr || (_base > 0 && _base <= 100));
mixer = _mixer;
base = _base;
Update();
}
void SetInfo(const ReplayGainInfo *_info) {
if (_info != nullptr) {
info = *_info;
info.Complete();
} else
info.Clear();
Update();
}
void SetMode(ReplayGainMode _mode) {
if (_mode == mode)
/* no change */
return;
FormatDebug(replay_gain_domain,
"replay gain mode has changed %d->%d\n",
mode, _mode);
mode = _mode;
Update();
}
/**
* Recalculates the new volume after a property was changed.
*/
void Update();
virtual AudioFormat Open(AudioFormat &af, Error &error) override;
virtual void Close();
virtual const void *FilterPCM(const void *src, size_t src_size,
size_t *dest_size_r, Error &error);
};
void
ReplayGainFilter::Update()
{
unsigned volume = PCM_VOLUME_1;
if (mode != REPLAY_GAIN_OFF) {
const auto &tuple = info.tuples[mode];
float scale = tuple.CalculateScale(replay_gain_preamp,
replay_gain_missing_preamp,
replay_gain_limit);
FormatDebug(replay_gain_domain,
"scale=%f\n", (double)scale);
volume = pcm_float_to_volume(scale);
}
pv.SetVolume(volume);
if (mixer != nullptr) {
/* update the hardware mixer volume */
unsigned _volume = (volume * base) / PCM_VOLUME_1;
if (_volume > 100)
_volume = 100;
Error error;
if (!mixer_set_volume(mixer, _volume, error))
LogError(error, "Failed to update hardware mixer");
}
}
static Filter *
replay_gain_filter_init(gcc_unused const config_param ¶m,
gcc_unused Error &error)
{
return new ReplayGainFilter();
}
AudioFormat
ReplayGainFilter::Open(AudioFormat &af, gcc_unused Error &error)
{
if (!pv.Open(af.format, error))
return AudioFormat::Undefined();
return af;
}
void
ReplayGainFilter::Close()
{
pv.Close();
}
const void *
ReplayGainFilter::FilterPCM(const void *src, size_t src_size,
size_t *dest_size_r, gcc_unused Error &error)
{
const auto dest = pv.Apply({src, src_size});
*dest_size_r = dest.size;
return dest.data;
}
const struct filter_plugin replay_gain_filter_plugin = {
"replay_gain",
replay_gain_filter_init,
};
void
replay_gain_filter_set_mixer(Filter *_filter, Mixer *mixer,
unsigned base)
{
ReplayGainFilter *filter = (ReplayGainFilter *)_filter;
filter->SetMixer(mixer, base);
}
void
replay_gain_filter_set_info(Filter *_filter, const ReplayGainInfo *info)
{
ReplayGainFilter *filter = (ReplayGainFilter *)_filter;
filter->SetInfo(info);
}
void
replay_gain_filter_set_mode(Filter *_filter, ReplayGainMode mode)
{
ReplayGainFilter *filter = (ReplayGainFilter *)_filter;
filter->SetMode(mode);
}
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