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