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/*
* Copyright 2003-2021 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 "ReplayGainFilterPlugin.hxx"
#include "filter/Filter.hxx"
#include "filter/Prepared.hxx"
#include "ReplayGainInfo.hxx"
#include "ReplayGainConfig.hxx"
#include "mixer/MixerControl.hxx"
#include "pcm/AudioFormat.hxx"
#include "pcm/Volume.hxx"
#include "util/ConstBuffer.hxx"
#include "util/Domain.hxx"
#include "Log.hxx"
#include <cassert>
#include <exception>
static constexpr Domain replay_gain_domain("replay_gain");
class ReplayGainFilter final : public Filter {
const ReplayGainConfig config;
/**
* If set, then this hardware mixer is used for applying
* replay gain, instead of the software volume library.
*/
Mixer *const mixer;
/**
* The base volume level for scale=1.0, between 1 and 100
* (including).
*/
const unsigned base;
ReplayGainMode mode = ReplayGainMode::OFF;
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(const ReplayGainConfig &_config, bool allow_convert,
const AudioFormat &audio_format,
Mixer *_mixer, unsigned _base)
:Filter(audio_format),
config(_config),
mixer(_mixer), base(_base) {
info.Clear();
out_audio_format.format = pv.Open(out_audio_format.format,
allow_convert);
}
void SetInfo(const ReplayGainInfo *_info) {
if (_info != nullptr)
info = *_info;
else
info.Clear();
Update();
}
void SetMode(ReplayGainMode _mode) {
if (_mode == mode)
/* no change */
return;
FormatDebug(replay_gain_domain,
"replay gain mode has changed %s->%s\n",
ToString(mode), ToString(_mode));
mode = _mode;
Update();
}
/**
* Recalculates the new volume after a property was changed.
*/
void Update();
/* virtual methods from class Filter */
ConstBuffer<void> FilterPCM(ConstBuffer<void> src) override;
};
class PreparedReplayGainFilter final : public PreparedFilter {
const ReplayGainConfig config;
/**
* If set, then this hardware mixer is used for applying
* replay gain, instead of the software volume library.
*/
Mixer *mixer = nullptr;
/**
* Allow the class to convert to a different #SampleFormat to
* preserve quality?
*/
const bool allow_convert;
/**
* The base volume level for scale=1.0, between 1 and 100
* (including).
*/
unsigned base;
public:
explicit PreparedReplayGainFilter(const ReplayGainConfig _config,
bool _allow_convert)
:config(_config), allow_convert(_allow_convert) {}
void SetMixer(Mixer *_mixer, unsigned _base) {
assert(_mixer == nullptr || (_base > 0 && _base <= 100));
mixer = _mixer;
base = _base;
}
/* virtual methods from class Filter */
std::unique_ptr<Filter> Open(AudioFormat &af) override;
};
void
ReplayGainFilter::Update()
{
unsigned volume = PCM_VOLUME_1;
if (mode != ReplayGainMode::OFF) {
const auto &tuple = info.Get(mode);
float scale = tuple.CalculateScale(config);
FormatDebug(replay_gain_domain,
"scale=%f\n", (double)scale);
volume = pcm_float_to_volume(scale);
}
if (mixer != nullptr) {
/* update the hardware mixer volume */
unsigned _volume = (volume * base) / PCM_VOLUME_1;
if (_volume > 100)
_volume = 100;
try {
mixer_set_volume(mixer, _volume);
} catch (...) {
LogError(std::current_exception(),
"Failed to update hardware mixer");
}
} else
pv.SetVolume(volume);
}
std::unique_ptr<PreparedFilter>
NewReplayGainFilter(const ReplayGainConfig &config,
bool allow_convert) noexcept
{
return std::make_unique<PreparedReplayGainFilter>(config,
allow_convert);
}
std::unique_ptr<Filter>
PreparedReplayGainFilter::Open(AudioFormat &af)
{
return std::make_unique<ReplayGainFilter>(config, allow_convert,
af, mixer, base);
}
ConstBuffer<void>
ReplayGainFilter::FilterPCM(ConstBuffer<void> src)
{
return mixer != nullptr
? src
: pv.Apply(src);
}
void
replay_gain_filter_set_mixer(PreparedFilter &_filter, Mixer *mixer,
unsigned base)
{
auto &filter = (PreparedReplayGainFilter &)_filter;
filter.SetMixer(mixer, base);
}
void
replay_gain_filter_set_info(Filter &_filter, const ReplayGainInfo *info)
{
auto &filter = (ReplayGainFilter &)_filter;
filter.SetInfo(info);
}
void
replay_gain_filter_set_mode(Filter &_filter, ReplayGainMode mode)
{
auto &filter = (ReplayGainFilter &)_filter;
filter.SetMode(mode);
}
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