michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* vim:set ts=2 sw=2 sts=2 et cindent: */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef AudioParamTimeline_h_
michael@0: #define AudioParamTimeline_h_
michael@0: 
michael@0: #include "AudioEventTimeline.h"
michael@0: #include "mozilla/ErrorResult.h"
michael@0: #include "nsAutoPtr.h"
michael@0: #include "MediaStreamGraph.h"
michael@0: #include "AudioSegment.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: 
michael@0: namespace dom {
michael@0: 
michael@0: // This helper class is used to represent the part of the AudioParam
michael@0: // class that gets sent to AudioNodeEngine instances.  In addition to
michael@0: // AudioEventTimeline methods, it holds a pointer to an optional
michael@0: // MediaStream which represents the AudioNode inputs to the AudioParam.
michael@0: // This MediaStream is managed by the AudioParam subclass on the main
michael@0: // thread, and can only be obtained from the AudioNodeEngine instances
michael@0: // consuming this class.
michael@0: class AudioParamTimeline : public AudioEventTimeline<ErrorResult>
michael@0: {
michael@0:   typedef AudioEventTimeline<ErrorResult> BaseClass;
michael@0: 
michael@0: public:
michael@0:   explicit AudioParamTimeline(float aDefaultValue)
michael@0:     : BaseClass(aDefaultValue)
michael@0:   {
michael@0:   }
michael@0: 
michael@0:   MediaStream* Stream() const
michael@0:   {
michael@0:     return mStream;
michael@0:   }
michael@0: 
michael@0:   bool HasSimpleValue() const
michael@0:   {
michael@0:     return BaseClass::HasSimpleValue() && !mStream;
michael@0:   }
michael@0: 
michael@0:   // Get the value of the AudioParam at time aTime + aCounter.
michael@0:   // aCounter here is an offset to aTime if we try to get the value in ticks,
michael@0:   // otherwise it should always be zero.  aCounter is meant to be used when
michael@0:   // getting the value of an a-rate AudioParam for each tick inside an
michael@0:   // AudioNodeEngine implementation.
michael@0:   template<class TimeType>
michael@0:   float GetValueAtTime(TimeType aTime, size_t aCounter = 0);
michael@0: 
michael@0:   virtual size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
michael@0:   {
michael@0:     return mStream ? mStream->SizeOfIncludingThis(aMallocSizeOf) : 0;
michael@0:   }
michael@0: 
michael@0:   virtual size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
michael@0:   {
michael@0:     return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
michael@0:   }
michael@0: 
michael@0: 
michael@0: private:
michael@0:   float AudioNodeInputValue(size_t aCounter) const;
michael@0: 
michael@0: protected:
michael@0:   // This is created lazily when needed.
michael@0:   nsRefPtr<MediaStream> mStream;
michael@0: };
michael@0: 
michael@0: template<> inline float
michael@0: AudioParamTimeline::GetValueAtTime(double aTime, size_t aCounter)
michael@0: {
michael@0:   MOZ_ASSERT(!aCounter);
michael@0: 
michael@0:   // Getting an AudioParam value on an AudioNode does not consider input from
michael@0:   // other AudioNodes, which is managed only on the graph thread.
michael@0:   return BaseClass::GetValueAtTime(aTime);
michael@0: }
michael@0: 
michael@0: 
michael@0: template<> inline float
michael@0: AudioParamTimeline::GetValueAtTime(int64_t aTime, size_t aCounter)
michael@0: {
michael@0:   MOZ_ASSERT(aCounter < WEBAUDIO_BLOCK_SIZE);
michael@0:   MOZ_ASSERT(!aCounter || !HasSimpleValue());
michael@0: 
michael@0:   // Mix the value of the AudioParam itself with that of the AudioNode inputs.
michael@0:   return BaseClass::GetValueAtTime(static_cast<int64_t>(aTime + aCounter)) +
michael@0:     (mStream ? AudioNodeInputValue(aCounter) : 0.0f);
michael@0: }
michael@0: 
michael@0: }
michael@0: }
michael@0: 
michael@0: #endif
michael@0: