111 lines
2.3 KiB
C++
111 lines
2.3 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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// Copyright The Music Player Daemon Project
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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 <cassert>
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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) noexcept
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:observer(_observer),
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prepared_filter(std::move(_prepared_filter)) {}
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~PreparedProxy() noexcept override {
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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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PreparedProxy(const PreparedProxy &) = delete;
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PreparedProxy &operator=(const PreparedProxy &) = delete;
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void Clear([[maybe_unused]] Proxy *_child) noexcept {
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assert(child == _child);
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child = nullptr;
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}
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Filter *Get() noexcept;
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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) noexcept
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:Filter(_filter->GetOutAudioFormat()),
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parent(_parent), filter(std::move(_filter)) {}
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~Proxy() noexcept override {
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parent.Clear(this);
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}
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Proxy(const Proxy &) = delete;
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Proxy &operator=(const Proxy &) = delete;
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Filter *Get() noexcept {
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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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std::span<const std::byte> FilterPCM(std::span<const std::byte> src) override {
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return filter->FilterPCM(src);
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}
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std::span<const std::byte> 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() noexcept
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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() noexcept
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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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