зеркало из https://github.com/mozilla/gecko-dev.git
150 строки
4.4 KiB
C++
150 строки
4.4 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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#include "AudioParam.h"
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#include "mozilla/dom/AudioParamBinding.h"
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#include "AudioNodeEngine.h"
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#include "AudioNodeStream.h"
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#include "AudioContext.h"
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namespace mozilla {
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namespace dom {
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NS_IMPL_CYCLE_COLLECTION_CLASS(AudioParam)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(AudioParam)
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tmp->DisconnectFromGraphAndDestroyStream();
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mNode)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(AudioParam)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mNode)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(AudioParam)
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NS_IMPL_CYCLE_COLLECTING_NATIVE_ADDREF(AudioParam)
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NS_IMETHODIMP_(MozExternalRefCountType)
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AudioParam::Release()
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{
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if (mRefCnt.get() == 1) {
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// We are about to be deleted, disconnect the object from the graph before
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// the derived type is destroyed.
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DisconnectFromGraphAndDestroyStream();
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}
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NS_IMPL_CC_NATIVE_RELEASE_BODY(AudioParam)
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}
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NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(AudioParam, AddRef)
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NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(AudioParam, Release)
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AudioParam::AudioParam(AudioNode* aNode,
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AudioParam::CallbackType aCallback,
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float aDefaultValue)
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: AudioParamTimeline(aDefaultValue)
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, mNode(aNode)
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, mCallback(aCallback)
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, mDefaultValue(aDefaultValue)
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{
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SetIsDOMBinding();
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}
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AudioParam::~AudioParam()
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{
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MOZ_ASSERT(mInputNodes.IsEmpty());
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}
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JSObject*
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AudioParam::WrapObject(JSContext* aCx)
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{
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return AudioParamBinding::Wrap(aCx, this);
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}
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void
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AudioParam::DisconnectFromGraphAndDestroyStream()
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{
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// Addref this temporarily so the refcount bumping below doesn't destroy us
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// prematurely
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nsRefPtr<AudioParam> kungFuDeathGrip = this;
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while (!mInputNodes.IsEmpty()) {
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uint32_t i = mInputNodes.Length() - 1;
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nsRefPtr<AudioNode> input = mInputNodes[i].mInputNode;
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mInputNodes.RemoveElementAt(i);
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input->RemoveOutputParam(this);
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}
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if (mNodeStreamPort) {
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mNodeStreamPort->Destroy();
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mNodeStreamPort = nullptr;
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}
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if (mStream) {
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mStream->Destroy();
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mStream = nullptr;
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}
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}
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MediaStream*
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AudioParam::Stream()
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{
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if (mStream) {
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return mStream;
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}
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AudioNodeEngine* engine = new AudioNodeEngine(nullptr);
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nsRefPtr<AudioNodeStream> stream =
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mNode->Context()->Graph()->CreateAudioNodeStream(engine,
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MediaStreamGraph::INTERNAL_STREAM,
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Node()->Context()->SampleRate());
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// Force the input to have only one channel, and make it down-mix using
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// the speaker rules if needed.
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stream->SetChannelMixingParametersImpl(1, ChannelCountMode::Explicit, ChannelInterpretation::Speakers);
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// Mark as an AudioParam helper stream
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stream->SetAudioParamHelperStream();
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mStream = stream.forget();
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// Setup the AudioParam's stream as an input to the owner AudioNode's stream
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MediaStream* nodeStream = mNode->Stream();
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MOZ_ASSERT(nodeStream->AsProcessedStream());
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ProcessedMediaStream* ps = static_cast<ProcessedMediaStream*>(nodeStream);
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mNodeStreamPort = ps->AllocateInputPort(mStream, MediaInputPort::FLAG_BLOCK_INPUT);
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// Let the MSG's copy of AudioParamTimeline know about the change in the stream
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mCallback(mNode);
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return mStream;
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}
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float
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AudioParamTimeline::AudioNodeInputValue(size_t aCounter) const
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{
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MOZ_ASSERT(mStream);
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// If we have a chunk produced by the AudioNode inputs to the AudioParam,
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// get its value now. We use aCounter to tell us which frame of the last
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// AudioChunk to look at.
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float audioNodeInputValue = 0.0f;
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const AudioChunk& lastAudioNodeChunk =
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static_cast<AudioNodeStream*>(mStream.get())->LastChunks()[0];
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if (!lastAudioNodeChunk.IsNull()) {
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MOZ_ASSERT(lastAudioNodeChunk.GetDuration() == WEBAUDIO_BLOCK_SIZE);
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audioNodeInputValue =
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static_cast<const float*>(lastAudioNodeChunk.mChannelData[0])[aCounter];
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audioNodeInputValue *= lastAudioNodeChunk.mVolume;
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}
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return audioNodeInputValue;
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}
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}
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}
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