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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 "Observer.hxx"
#include "Filter.hxx"
#include "Prepared.hxx"
#include "util/ConstBuffer.hxx"
#include <cassert>
class FilterObserver::PreparedProxy final : public PreparedFilter {
FilterObserver &observer;
std::unique_ptr<PreparedFilter> prepared_filter;
Proxy *child = nullptr;
public:
PreparedProxy(FilterObserver &_observer,
std::unique_ptr<PreparedFilter> _prepared_filter) noexcept
:observer(_observer),
prepared_filter(std::move(_prepared_filter)) {}
~PreparedProxy() noexcept override {
assert(child == nullptr);
assert(observer.proxy == this);
observer.proxy = nullptr;
}
void Clear([[maybe_unused]] Proxy *_child) noexcept {
assert(child == _child);
child = nullptr;
}
Filter *Get() noexcept;
std::unique_ptr<Filter> Open(AudioFormat &af) override;
};
class FilterObserver::Proxy final : public Filter {
PreparedProxy &parent;
std::unique_ptr<Filter> filter;
public:
Proxy(PreparedProxy &_parent, std::unique_ptr<Filter> _filter) noexcept
:Filter(_filter->GetOutAudioFormat()),
parent(_parent), filter(std::move(_filter)) {}
~Proxy() noexcept override {
parent.Clear(this);
}
Filter *Get() noexcept {
return filter.get();
}
void Reset() noexcept override {
filter->Reset();
}
ConstBuffer<void> FilterPCM(ConstBuffer<void> src) override {
return filter->FilterPCM(src);
}
ConstBuffer<void> Flush() override {
return filter->Flush();
}
};
Filter *
FilterObserver::PreparedProxy::Get() noexcept
{
return child != nullptr
? child->Get()
: nullptr;
}
std::unique_ptr<Filter>
FilterObserver::PreparedProxy::Open(AudioFormat &af)
{
assert(child == nullptr);
auto c = std::make_unique<Proxy>(*this, prepared_filter->Open(af));
child = c.get();
return c;
}
std::unique_ptr<PreparedFilter>
FilterObserver::Set(std::unique_ptr<PreparedFilter> pf)
{
assert(proxy == nullptr);
auto p = std::make_unique<PreparedProxy>(*this, std::move(pf));
proxy = p.get();
return p;
}
Filter *
FilterObserver::Get() noexcept
{
return proxy != nullptr
? proxy->Get()
: nullptr;
}
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