123 lines
2.7 KiB
C++
123 lines
2.7 KiB
C++
/*
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* Copyright 2003-2017 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "Observer.hxx"
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#include "Filter.hxx"
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#include "Prepared.hxx"
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#include "util/ConstBuffer.hxx"
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#include <assert.h>
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class FilterObserver::PreparedProxy final : public PreparedFilter {
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FilterObserver &observer;
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std::unique_ptr<PreparedFilter> prepared_filter;
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Proxy *child = nullptr;
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public:
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PreparedProxy(FilterObserver &_observer,
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std::unique_ptr<PreparedFilter> _prepared_filter)
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:observer(_observer),
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prepared_filter(std::move(_prepared_filter)) {}
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~PreparedProxy() {
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assert(child == nullptr);
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assert(observer.proxy == this);
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observer.proxy = nullptr;
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}
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void Clear(gcc_unused Proxy *_child) {
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assert(child == _child);
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child = nullptr;
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}
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Filter *Get();
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std::unique_ptr<Filter> Open(AudioFormat &af) override;
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};
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class FilterObserver::Proxy final : public Filter {
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PreparedProxy &parent;
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std::unique_ptr<Filter> filter;
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public:
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Proxy(PreparedProxy &_parent, std::unique_ptr<Filter> _filter)
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:Filter(_filter->GetOutAudioFormat()),
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parent(_parent), filter(std::move(_filter)) {}
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~Proxy() {
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parent.Clear(this);
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}
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Filter *Get() {
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return filter.get();
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}
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void Reset() noexcept override {
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filter->Reset();
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}
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ConstBuffer<void> FilterPCM(ConstBuffer<void> src) override {
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return filter->FilterPCM(src);
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}
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ConstBuffer<void> Flush() override {
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return filter->Flush();
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}
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};
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Filter *
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FilterObserver::PreparedProxy::Get()
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{
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return child != nullptr
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? child->Get()
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: nullptr;
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}
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std::unique_ptr<Filter>
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FilterObserver::PreparedProxy::Open(AudioFormat &af)
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{
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assert(child == nullptr);
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auto c = std::make_unique<Proxy>(*this, prepared_filter->Open(af));
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child = c.get();
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return c;
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}
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std::unique_ptr<PreparedFilter>
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FilterObserver::Set(std::unique_ptr<PreparedFilter> pf)
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{
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assert(proxy == nullptr);
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auto p = std::make_unique<PreparedProxy>(*this, std::move(pf));
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proxy = p.get();
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return p;
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}
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Filter *
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FilterObserver::Get()
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{
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return proxy != nullptr
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? proxy->Get()
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: nullptr;
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}
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