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/*
* Copyright 2003-2020 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 "AutoConvertFilterPlugin.hxx"
#include "ConvertFilterPlugin.hxx"
#include "filter/Filter.hxx"
#include "filter/Prepared.hxx"
#include "pcm/AudioFormat.hxx"
#include "util/ConstBuffer.hxx"
#include <cassert>
#include <memory>
class AutoConvertFilter final : public Filter {
/**
* The underlying filter.
*/
std::unique_ptr<Filter> filter;
/**
* A convert_filter, just in case conversion is needed. nullptr
* if unused.
*/
std::unique_ptr<Filter> convert;
public:
AutoConvertFilter(std::unique_ptr<Filter> &&_filter,
std::unique_ptr<Filter> &&_convert)
:Filter(_filter->GetOutAudioFormat()),
filter(std::move(_filter)), convert(std::move(_convert)) {}
void Reset() noexcept override {
filter->Reset();
if (convert)
convert->Reset();
}
ConstBuffer<void> FilterPCM(ConstBuffer<void> src) override;
ConstBuffer<void> Flush() override;
};
class PreparedAutoConvertFilter final : public PreparedFilter {
/**
* The underlying filter.
*/
std::unique_ptr<PreparedFilter> filter;
public:
explicit PreparedAutoConvertFilter(std::unique_ptr<PreparedFilter> _filter) noexcept
:filter(std::move(_filter)) {}
std::unique_ptr<Filter> Open(AudioFormat &af) override;
};
std::unique_ptr<Filter>
PreparedAutoConvertFilter::Open(AudioFormat &in_audio_format)
{
assert(in_audio_format.IsValid());
/* open the "real" filter */
AudioFormat child_audio_format = in_audio_format;
auto new_filter = filter->Open(child_audio_format);
/* need to convert? */
std::unique_ptr<Filter> convert;
if (in_audio_format != child_audio_format) {
/* yes - create a convert_filter */
convert = convert_filter_new(in_audio_format,
child_audio_format);
}
return std::make_unique<AutoConvertFilter>(std::move(new_filter),
std::move(convert));
}
ConstBuffer<void>
AutoConvertFilter::FilterPCM(ConstBuffer<void> src)
{
if (convert != nullptr)
src = convert->FilterPCM(src);
return filter->FilterPCM(src);
}
ConstBuffer<void>
AutoConvertFilter::Flush()
{
if (convert != nullptr) {
auto result = convert->Flush();
if (!result.IsNull())
return filter->FilterPCM(result);
}
return filter->Flush();
}
std::unique_ptr<PreparedFilter>
autoconvert_filter_new(std::unique_ptr<PreparedFilter> filter) noexcept
{
return std::make_unique<PreparedAutoConvertFilter>(std::move(filter));
}
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