1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/DelayNode.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,233 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim:set ts=2 sw=2 sts=2 et cindent: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#include "DelayNode.h"
1.11 +#include "mozilla/dom/DelayNodeBinding.h"
1.12 +#include "AudioNodeEngine.h"
1.13 +#include "AudioNodeStream.h"
1.14 +#include "AudioDestinationNode.h"
1.15 +#include "WebAudioUtils.h"
1.16 +#include "DelayBuffer.h"
1.17 +#include "PlayingRefChangeHandler.h"
1.18 +
1.19 +namespace mozilla {
1.20 +namespace dom {
1.21 +
1.22 +NS_IMPL_CYCLE_COLLECTION_INHERITED(DelayNode, AudioNode,
1.23 + mDelay)
1.24 +
1.25 +NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(DelayNode)
1.26 +NS_INTERFACE_MAP_END_INHERITING(AudioNode)
1.27 +
1.28 +NS_IMPL_ADDREF_INHERITED(DelayNode, AudioNode)
1.29 +NS_IMPL_RELEASE_INHERITED(DelayNode, AudioNode)
1.30 +
1.31 +class DelayNodeEngine : public AudioNodeEngine
1.32 +{
1.33 + typedef PlayingRefChangeHandler PlayingRefChanged;
1.34 +public:
1.35 + DelayNodeEngine(AudioNode* aNode, AudioDestinationNode* aDestination,
1.36 + double aMaxDelayTicks)
1.37 + : AudioNodeEngine(aNode)
1.38 + , mSource(nullptr)
1.39 + , mDestination(static_cast<AudioNodeStream*> (aDestination->Stream()))
1.40 + // Keep the default value in sync with the default value in DelayNode::DelayNode.
1.41 + , mDelay(0.f)
1.42 + // Use a smoothing range of 20ms
1.43 + , mBuffer(std::max(aMaxDelayTicks,
1.44 + static_cast<double>(WEBAUDIO_BLOCK_SIZE)),
1.45 + WebAudioUtils::ComputeSmoothingRate(0.02,
1.46 + mDestination->SampleRate()))
1.47 + , mMaxDelay(aMaxDelayTicks)
1.48 + , mLastOutputPosition(-1)
1.49 + , mLeftOverData(INT32_MIN)
1.50 + {
1.51 + }
1.52 +
1.53 + virtual DelayNodeEngine* AsDelayNodeEngine()
1.54 + {
1.55 + return this;
1.56 + }
1.57 +
1.58 + void SetSourceStream(AudioNodeStream* aSource)
1.59 + {
1.60 + mSource = aSource;
1.61 + }
1.62 +
1.63 + enum Parameters {
1.64 + DELAY,
1.65 + };
1.66 + void SetTimelineParameter(uint32_t aIndex,
1.67 + const AudioParamTimeline& aValue,
1.68 + TrackRate aSampleRate) MOZ_OVERRIDE
1.69 + {
1.70 + switch (aIndex) {
1.71 + case DELAY:
1.72 + MOZ_ASSERT(mSource && mDestination);
1.73 + mDelay = aValue;
1.74 + WebAudioUtils::ConvertAudioParamToTicks(mDelay, mSource, mDestination);
1.75 + break;
1.76 + default:
1.77 + NS_ERROR("Bad DelayNodeEngine TimelineParameter");
1.78 + }
1.79 + }
1.80 +
1.81 + virtual void ProcessBlock(AudioNodeStream* aStream,
1.82 + const AudioChunk& aInput,
1.83 + AudioChunk* aOutput,
1.84 + bool* aFinished) MOZ_OVERRIDE
1.85 + {
1.86 + MOZ_ASSERT(mSource == aStream, "Invalid source stream");
1.87 + MOZ_ASSERT(aStream->SampleRate() == mDestination->SampleRate());
1.88 +
1.89 + if (!aInput.IsNull()) {
1.90 + if (mLeftOverData <= 0) {
1.91 + nsRefPtr<PlayingRefChanged> refchanged =
1.92 + new PlayingRefChanged(aStream, PlayingRefChanged::ADDREF);
1.93 + aStream->Graph()->
1.94 + DispatchToMainThreadAfterStreamStateUpdate(refchanged.forget());
1.95 + }
1.96 + mLeftOverData = mBuffer.MaxDelayTicks();
1.97 + } else if (mLeftOverData > 0) {
1.98 + mLeftOverData -= WEBAUDIO_BLOCK_SIZE;
1.99 + } else {
1.100 + if (mLeftOverData != INT32_MIN) {
1.101 + mLeftOverData = INT32_MIN;
1.102 + // Delete our buffered data now we no longer need it
1.103 + mBuffer.Reset();
1.104 +
1.105 + nsRefPtr<PlayingRefChanged> refchanged =
1.106 + new PlayingRefChanged(aStream, PlayingRefChanged::RELEASE);
1.107 + aStream->Graph()->
1.108 + DispatchToMainThreadAfterStreamStateUpdate(refchanged.forget());
1.109 + }
1.110 + *aOutput = aInput;
1.111 + return;
1.112 + }
1.113 +
1.114 + mBuffer.Write(aInput);
1.115 +
1.116 + UpdateOutputBlock(aOutput);
1.117 + mBuffer.NextBlock();
1.118 + }
1.119 +
1.120 + void UpdateOutputBlock(AudioChunk* aOutput)
1.121 + {
1.122 + TrackTicks tick = mSource->GetCurrentPosition();
1.123 + if (tick == mLastOutputPosition) {
1.124 + return; // mLastChunks is already set on the stream
1.125 + }
1.126 +
1.127 + mLastOutputPosition = tick;
1.128 + bool inCycle = mSource->AsProcessedStream()->InCycle();
1.129 + double minDelay = inCycle ? static_cast<double>(WEBAUDIO_BLOCK_SIZE) : 0.0;
1.130 + double maxDelay = mMaxDelay;
1.131 + double sampleRate = mSource->SampleRate();
1.132 + ChannelInterpretation channelInterpretation =
1.133 + mSource->GetChannelInterpretation();
1.134 + if (mDelay.HasSimpleValue()) {
1.135 + // If this DelayNode is in a cycle, make sure the delay value is at least
1.136 + // one block, even if that is greater than maxDelay.
1.137 + double delayFrames = mDelay.GetValue() * sampleRate;
1.138 + double delayFramesClamped =
1.139 + std::max(minDelay, std::min(delayFrames, maxDelay));
1.140 + mBuffer.Read(delayFramesClamped, aOutput, channelInterpretation);
1.141 + } else {
1.142 + // Compute the delay values for the duration of the input AudioChunk
1.143 + // If this DelayNode is in a cycle, make sure the delay value is at least
1.144 + // one block.
1.145 + double computedDelay[WEBAUDIO_BLOCK_SIZE];
1.146 + for (size_t counter = 0; counter < WEBAUDIO_BLOCK_SIZE; ++counter) {
1.147 + double delayAtTick = mDelay.GetValueAtTime(tick, counter) * sampleRate;
1.148 + double delayAtTickClamped =
1.149 + std::max(minDelay, std::min(delayAtTick, maxDelay));
1.150 + computedDelay[counter] = delayAtTickClamped;
1.151 + }
1.152 + mBuffer.Read(computedDelay, aOutput, channelInterpretation);
1.153 + }
1.154 + }
1.155 +
1.156 + virtual void ProduceBlockBeforeInput(AudioChunk* aOutput) MOZ_OVERRIDE
1.157 + {
1.158 + if (mLeftOverData <= 0) {
1.159 + aOutput->SetNull(WEBAUDIO_BLOCK_SIZE);
1.160 + } else {
1.161 + UpdateOutputBlock(aOutput);
1.162 + }
1.163 + }
1.164 +
1.165 + virtual size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE
1.166 + {
1.167 + size_t amount = AudioNodeEngine::SizeOfExcludingThis(aMallocSizeOf);
1.168 + // Not owned:
1.169 + // - mSource - probably not owned
1.170 + // - mDestination - probably not owned
1.171 + // - mDelay - shares ref with AudioNode, don't count
1.172 + amount += mBuffer.SizeOfExcludingThis(aMallocSizeOf);
1.173 + return amount;
1.174 + }
1.175 +
1.176 + virtual size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE
1.177 + {
1.178 + return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
1.179 + }
1.180 +
1.181 + AudioNodeStream* mSource;
1.182 + AudioNodeStream* mDestination;
1.183 + AudioParamTimeline mDelay;
1.184 + DelayBuffer mBuffer;
1.185 + double mMaxDelay;
1.186 + TrackTicks mLastOutputPosition;
1.187 + // How much data we have in our buffer which needs to be flushed out when our inputs
1.188 + // finish.
1.189 + int32_t mLeftOverData;
1.190 +};
1.191 +
1.192 +DelayNode::DelayNode(AudioContext* aContext, double aMaxDelay)
1.193 + : AudioNode(aContext,
1.194 + 2,
1.195 + ChannelCountMode::Max,
1.196 + ChannelInterpretation::Speakers)
1.197 + , mDelay(new AudioParam(MOZ_THIS_IN_INITIALIZER_LIST(),
1.198 + SendDelayToStream, 0.0f))
1.199 +{
1.200 + DelayNodeEngine* engine =
1.201 + new DelayNodeEngine(this, aContext->Destination(),
1.202 + aContext->SampleRate() * aMaxDelay);
1.203 + mStream = aContext->Graph()->CreateAudioNodeStream(engine, MediaStreamGraph::INTERNAL_STREAM);
1.204 + engine->SetSourceStream(static_cast<AudioNodeStream*> (mStream.get()));
1.205 +}
1.206 +
1.207 +size_t
1.208 +DelayNode::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
1.209 +{
1.210 + size_t amount = AudioNode::SizeOfExcludingThis(aMallocSizeOf);
1.211 + amount += mDelay->SizeOfIncludingThis(aMallocSizeOf);
1.212 + return amount;
1.213 +}
1.214 +
1.215 +size_t
1.216 +DelayNode::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
1.217 +{
1.218 + return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
1.219 +}
1.220 +
1.221 +JSObject*
1.222 +DelayNode::WrapObject(JSContext* aCx)
1.223 +{
1.224 + return DelayNodeBinding::Wrap(aCx, this);
1.225 +}
1.226 +
1.227 +void
1.228 +DelayNode::SendDelayToStream(AudioNode* aNode)
1.229 +{
1.230 + DelayNode* This = static_cast<DelayNode*>(aNode);
1.231 + SendTimelineParameterToStream(This, DelayNodeEngine::DELAY, *This->mDelay);
1.232 +}
1.233 +
1.234 +}
1.235 +}
1.236 +
