61e596fc49
Pass the Config down to all AudioProcessing components. Also add an EchoCancellationImplWrapper to optionally create different EchoCancellationImpls. BUG=2117 TBR=turaj@webrtc.org TESTED=git try Review URL: https://webrtc-codereview.appspot.com/1843004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@4400 4adac7df-926f-26a2-2b94-8c16560cd09d
123 lines
3.2 KiB
C++
123 lines
3.2 KiB
C++
/*
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* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_COMMON_H_
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#define WEBRTC_COMMON_H_
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#include <map>
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namespace webrtc {
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// Class Config is designed to ease passing a set of options across webrtc code.
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// Options are identified by typename in order to avoid incorrect casts.
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//
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// Usage:
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// * declaring an option:
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// struct Algo1_CostFunction {
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// virtual float cost(int x) const { return x; }
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// virtual ~Algo1_CostFunction() {}
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// };
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//
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// * accessing an option:
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// config.Get<Algo1_CostFunction>().cost(value);
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//
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// * setting an option:
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// struct SqrCost : Algo1_CostFunction {
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// virtual float cost(int x) const { return x*x; }
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// };
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// config.Set<Algo1_CostFunction>(new SqrCost());
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//
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// Note: This class is thread-compatible (like STL containers).
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class Config {
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public:
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// Returns the option if set or a default constructed one.
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// Callers that access options too often are encouraged to cache the result.
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// Returned references are owned by this.
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//
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// Requires std::is_default_constructible<T>
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template<typename T> const T& Get() const;
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// Set the option, deleting any previous instance of the same.
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// This instance gets ownership of the newly set value.
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template<typename T> void Set(T* value);
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Config() {}
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~Config() {
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// Note: this method is inline so webrtc public API depends only
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// on the headers.
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for (OptionMap::iterator it = options_.begin();
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it != options_.end(); ++it) {
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delete it->second;
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}
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}
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private:
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typedef void* OptionIdentifier;
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struct BaseOption {
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virtual ~BaseOption() {}
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};
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template<typename T>
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struct Option : BaseOption {
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explicit Option(T* v): value(v) {}
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~Option() {
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delete value;
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}
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T* value;
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};
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// Own implementation of rtti-subset to avoid depending on rtti and its costs.
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template<typename T>
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static OptionIdentifier identifier() {
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static char id_placeholder;
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return &id_placeholder;
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}
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// Used to instantiate a default constructed object that doesn't needs to be
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// owned. This allows Get<T> to be implemented without requiring explicitly
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// locks.
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template<typename T>
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static const T& default_value() {
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static const T def;
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return def;
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}
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typedef std::map<OptionIdentifier, BaseOption*> OptionMap;
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OptionMap options_;
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// DISALLOW_COPY_AND_ASSIGN
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Config(const Config&);
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void operator=(const Config&);
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};
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template<typename T>
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const T& Config::Get() const {
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OptionMap::const_iterator it = options_.find(identifier<T>());
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if (it != options_.end()) {
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const T* t = static_cast<Option<T>*>(it->second)->value;
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if (t) {
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return *t;
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}
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}
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return default_value<T>();
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}
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template<typename T>
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void Config::Set(T* value) {
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BaseOption*& it = options_[identifier<T>()];
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delete it;
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it = new Option<T>(value);
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}
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} // namespace webrtc
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#endif // WEBRTC_COMMON_H_
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