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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 "ConvertFilterPlugin.hxx"
#include "filter/Filter.hxx"
#include "filter/Prepared.hxx"
#include "pcm/AudioFormat.hxx"
#include "pcm/Convert.hxx"
#include "util/ConstBuffer.hxx"
#include <cassert>
#include <memory>
class ConvertFilter final : public Filter {
/**
* The input audio format; PCM data is passed to the filter()
* method in this format.
*/
const AudioFormat in_audio_format;
/**
* This object is only "open" if #in_audio_format !=
* #out_audio_format.
*/
std::unique_ptr<PcmConvert> state;
public:
explicit ConvertFilter(const AudioFormat &audio_format);
void Set(const AudioFormat &_out_audio_format);
void Reset() noexcept override {
if (state)
state->Reset();
}
ConstBuffer<void> FilterPCM(ConstBuffer<void> src) override;
ConstBuffer<void> Flush() override {
return state
? state->Flush()
: nullptr;
}
};
class PreparedConvertFilter final : public PreparedFilter {
public:
std::unique_ptr<Filter> Open(AudioFormat &af) override;
};
void
ConvertFilter::Set(const AudioFormat &_out_audio_format)
{
assert(_out_audio_format.IsValid());
if (_out_audio_format == out_audio_format)
/* no change */
return;
if (state) {
out_audio_format = in_audio_format;
state.reset();
}
if (_out_audio_format == in_audio_format)
/* optimized special case: no-op */
return;
state = std::make_unique<PcmConvert>(in_audio_format,
_out_audio_format);
out_audio_format = _out_audio_format;
}
ConvertFilter::ConvertFilter(const AudioFormat &audio_format)
:Filter(audio_format), in_audio_format(audio_format)
{
assert(in_audio_format.IsValid());
}
std::unique_ptr<Filter>
PreparedConvertFilter::Open(AudioFormat &audio_format)
{
assert(audio_format.IsValid());
return std::make_unique<ConvertFilter>(audio_format);
}
ConstBuffer<void>
ConvertFilter::FilterPCM(ConstBuffer<void> src)
{
return state
? state->Convert(src)
/* optimized special case: no-op */
: src;
}
std::unique_ptr<PreparedFilter>
convert_filter_prepare() noexcept
{
return std::make_unique<PreparedConvertFilter>();
}
std::unique_ptr<Filter>
convert_filter_new(const AudioFormat in_audio_format,
const AudioFormat out_audio_format)
{
std::unique_ptr<ConvertFilter> filter(new ConvertFilter(in_audio_format));
filter->Set(out_audio_format);
return filter;
}
void
convert_filter_set(Filter *_filter, AudioFormat out_audio_format)
{
auto *filter = (ConvertFilter *)_filter;
filter->Set(out_audio_format);
}