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76 lines
2.2 KiB
C++
76 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef AudioParamTimeline_h_
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#define AudioParamTimeline_h_
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#include "AudioEventTimeline.h"
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#include "mozilla/ErrorResult.h"
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#include "nsAutoPtr.h"
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#include "MediaStreamGraph.h"
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#include "AudioSegment.h"
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namespace mozilla {
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namespace dom {
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// This helper class is used to represent the part of the AudioParam
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// class that gets sent to AudioNodeEngine instances. In addition to
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// AudioEventTimeline methods, it holds a pointer to an optional
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// MediaStream which represents the AudioNode inputs to the AudioParam.
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// This MediaStream is managed by the AudioParam subclass on the main
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// thread, and can only be obtained from the AudioNodeEngine instances
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// consuming this class.
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class AudioParamTimeline : public AudioEventTimeline<ErrorResult>
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{
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typedef AudioEventTimeline<ErrorResult> BaseClass;
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public:
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explicit AudioParamTimeline(float aDefaultValue)
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: BaseClass(aDefaultValue)
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{
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}
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MediaStream* Stream() const
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{
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return mStream;
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}
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bool HasSimpleValue() const
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{
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return BaseClass::HasSimpleValue() && !mStream;
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}
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// Get the value of the AudioParam at time aTime + aCounter.
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// aCounter here is an offset to aTime if we try to get the value in ticks,
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// otherwise it should always be zero. aCounter is meant to be used when
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// getting the value of an a-rate AudioParam for each tick inside an
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// AudioNodeEngine implementation.
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template<class TimeType>
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float GetValueAtTime(TimeType aTime, size_t aCounter = 0)
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{
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MOZ_ASSERT(aCounter < WEBAUDIO_BLOCK_SIZE);
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MOZ_ASSERT(!aCounter || !HasSimpleValue());
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// Mix the value of the AudioParam itself with that of the AudioNode inputs.
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return BaseClass::GetValueAtTime(static_cast<TimeType>(aTime + aCounter)) +
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(mStream ? AudioNodeInputValue(aCounter) : 0.0f);
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}
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private:
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float AudioNodeInputValue(size_t aCounter) const;
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protected:
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// This is created lazily when needed.
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nsRefPtr<MediaStream> mStream;
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};
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}
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}
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#endif
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