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/*
* Copyright (C) 2012, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_AUDIO_SUMMING_JUNCTION_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_AUDIO_SUMMING_JUNCTION_H_
#include "third_party/blink/renderer/platform/audio/audio_bus.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/wtf/hash_set.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
class AudioNodeOutput;
class DeferredTaskHandler;
// An AudioSummingJunction represents a point where zero, one, or more
// AudioNodeOutputs connect.
class AudioSummingJunction {
public:
virtual ~AudioSummingJunction();
// Can be called from any thread.
DeferredTaskHandler& GetDeferredTaskHandler() const {
return *deferred_task_handler_;
}
// This must be called whenever we modify m_outputs.
void ChangedOutputs();
// This copies m_outputs to m_renderingOutputs. Please see comments for these
// lists below. This must be called when we own the context's graph lock in
// the audio thread at the very start or end of the render quantum.
void UpdateRenderingState();
// Rendering code accesses its version of the current connections here.
unsigned NumberOfRenderingConnections() const {
return rendering_outputs_.size();
}
AudioNodeOutput* RenderingOutput(unsigned i) { return rendering_outputs_[i]; }
bool IsConnected() const { return NumberOfRenderingConnections() > 0; }
virtual void DidUpdate() = 0;
protected:
explicit AudioSummingJunction(DeferredTaskHandler&);
scoped_refptr<DeferredTaskHandler> deferred_task_handler_;
// m_outputs contains the AudioNodeOutputs representing current connections
// which are not disabled. The rendering code should never use this
// directly, but instead uses m_renderingOutputs.
// These raw pointers are safe. Owner AudioNodes of these AudioNodeOutputs
// manage their lifetime, and AudioNode::dispose() disconnects all of
// connections.
HashSet<AudioNodeOutput*> outputs_;
// m_renderingOutputs is a copy of m_outputs which will never be modified
// during the graph rendering on the audio thread. This is the list which
// is used by the rendering code.
// Whenever m_outputs is modified, the context is told so it can later
// update m_renderingOutputs from m_outputs at a safe time. Most of the
// time, m_renderingOutputs is identical to m_outputs.
// These raw pointers are safe. Owner of this AudioSummingJunction has
// strong references to owners of these AudioNodeOutput.
Vector<AudioNodeOutput*> rendering_outputs_;
// m_renderingStateNeedUpdating keeps track if m_outputs is modified.
bool rendering_state_need_updating_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_AUDIO_SUMMING_JUNCTION_H_
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