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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef AudioParamTimeline_h_
#define AudioParamTimeline_h_
#include "AudioEventTimeline.h"
#include "AudioNodeTrack.h"
#include "mozilla/ErrorResult.h"
#include "AudioSegment.h"
namespace mozilla {
namespace dom {
// This helper class is used to represent the part of the AudioParam
// class that gets sent to AudioNodeEngine instances. In addition to
// AudioEventTimeline methods, it holds a pointer to an optional
// AudioNodeTrack which represents the AudioNode inputs to the AudioParam.
// This AudioNodeTrack is managed by the AudioParam subclass on the main
// thread, and can only be obtained from the AudioNodeEngine instances
// consuming this class.
class AudioParamTimeline : public AudioEventTimeline {
typedef AudioEventTimeline BaseClass;
public:
explicit AudioParamTimeline(float aDefaultValue) : BaseClass(aDefaultValue) {}
AudioNodeTrack* Track() const { return mTrack; }
bool HasSimpleValue() const {
return BaseClass::HasSimpleValue() &&
(!mTrack || mTrack->LastChunks()[0].IsNull());
}
template <class TimeType>
float GetValueAtTime(TimeType aTime) {
return GetValueAtTime(aTime, 0);
}
template <typename TimeType>
void InsertEvent(const AudioTimelineEvent& aEvent) {
if (aEvent.mType == AudioTimelineEvent::Cancel) {
CancelScheduledValues(aEvent.Time<TimeType>());
return;
}
if (aEvent.mType == AudioTimelineEvent::Track) {
mTrack = aEvent.mTrack;
return;
}
if (aEvent.mType == AudioTimelineEvent::SetValue) {
AudioEventTimeline::SetValue(aEvent.mValue);
return;
}
AudioEventTimeline::InsertEvent<TimeType>(aEvent);
}
// Get the value of the AudioParam at time aTime + aCounter.
// aCounter here is an offset to aTime if we try to get the value in ticks,
// otherwise it should always be zero. aCounter is meant to be used when
template <class TimeType>
float GetValueAtTime(TimeType aTime, size_t aCounter);
// Get the values of the AudioParam at time aTime + (0 to aSize).
// aBuffer must have the correct aSize.
// aSize here is an offset to aTime if we try to get the value in ticks,
// otherwise it should always be zero. aSize is meant to be used when
// getting the value of an a-rate AudioParam for each tick inside an
// AudioNodeEngine implementation.
template <class TimeType>
void GetValuesAtTime(TimeType aTime, float* aBuffer, const size_t aSize);
virtual size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const {
return mTrack ? mTrack->SizeOfIncludingThis(aMallocSizeOf) : 0;
}
virtual size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const {
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}
private:
float AudioNodeInputValue(size_t aCounter) const;
protected:
// This is created lazily when needed.
RefPtr<AudioNodeTrack> mTrack;
};
template <>
inline float AudioParamTimeline::GetValueAtTime(double aTime, size_t aCounter) {
MOZ_ASSERT(!aCounter);
// Getting an AudioParam value on an AudioNode does not consider input from
// other AudioNodes, which is managed only on the graph thread.
return BaseClass::GetValueAtTime(aTime);
}
template <>
inline float AudioParamTimeline::GetValueAtTime(int64_t aTime,
size_t aCounter) {
MOZ_ASSERT(aCounter < WEBAUDIO_BLOCK_SIZE);
MOZ_ASSERT(!aCounter || !HasSimpleValue());
// Mix the value of the AudioParam itself with that of the AudioNode inputs.
return BaseClass::GetValueAtTime(static_cast<int64_t>(aTime + aCounter)) +
(mTrack ? AudioNodeInputValue(aCounter) : 0.0f);
}
template <>
inline void AudioParamTimeline::GetValuesAtTime(double aTime, float* aBuffer,
const size_t aSize) {
MOZ_ASSERT(aBuffer);
MOZ_ASSERT(aSize == 1);
// Getting an AudioParam value on an AudioNode does not consider input from
// other AudioNodes, which is managed only on the graph thread.
*aBuffer = BaseClass::GetValueAtTime(aTime);
}
template <>
inline void AudioParamTimeline::GetValuesAtTime(int64_t aTime, float* aBuffer,
const size_t aSize) {
MOZ_ASSERT(aBuffer);
MOZ_ASSERT(aSize <= WEBAUDIO_BLOCK_SIZE);
MOZ_ASSERT(aSize == 1 || !HasSimpleValue());
// Mix the value of the AudioParam itself with that of the AudioNode inputs.
BaseClass::GetValuesAtTime(aTime, aBuffer, aSize);
if (mTrack) {
uint32_t blockOffset = aTime % WEBAUDIO_BLOCK_SIZE;
MOZ_ASSERT(blockOffset + aSize <= WEBAUDIO_BLOCK_SIZE);
for (size_t i = 0; i < aSize; ++i) {
aBuffer[i] += AudioNodeInputValue(blockOffset + i);
}
}
}
} // namespace dom
} // namespace mozilla
#endif