1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/AudioParam.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,149 @@
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 "AudioParam.h"
1.11 +#include "mozilla/dom/AudioParamBinding.h"
1.12 +#include "AudioNodeEngine.h"
1.13 +#include "AudioNodeStream.h"
1.14 +#include "AudioContext.h"
1.15 +
1.16 +namespace mozilla {
1.17 +namespace dom {
1.18 +
1.19 +NS_IMPL_CYCLE_COLLECTION_CLASS(AudioParam)
1.20 +
1.21 +NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(AudioParam)
1.22 + tmp->DisconnectFromGraphAndDestroyStream();
1.23 + NS_IMPL_CYCLE_COLLECTION_UNLINK(mNode)
1.24 + NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
1.25 +NS_IMPL_CYCLE_COLLECTION_UNLINK_END
1.26 +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(AudioParam)
1.27 + NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mNode)
1.28 + NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
1.29 +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
1.30 +
1.31 +NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(AudioParam)
1.32 +
1.33 +NS_IMPL_CYCLE_COLLECTING_NATIVE_ADDREF(AudioParam)
1.34 +
1.35 +NS_IMETHODIMP_(MozExternalRefCountType)
1.36 +AudioParam::Release()
1.37 +{
1.38 + if (mRefCnt.get() == 1) {
1.39 + // We are about to be deleted, disconnect the object from the graph before
1.40 + // the derived type is destroyed.
1.41 + DisconnectFromGraphAndDestroyStream();
1.42 + }
1.43 + NS_IMPL_CC_NATIVE_RELEASE_BODY(AudioParam)
1.44 +}
1.45 +
1.46 +NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(AudioParam, AddRef)
1.47 +NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(AudioParam, Release)
1.48 +
1.49 +AudioParam::AudioParam(AudioNode* aNode,
1.50 + AudioParam::CallbackType aCallback,
1.51 + float aDefaultValue)
1.52 + : AudioParamTimeline(aDefaultValue)
1.53 + , mNode(aNode)
1.54 + , mCallback(aCallback)
1.55 + , mDefaultValue(aDefaultValue)
1.56 +{
1.57 + SetIsDOMBinding();
1.58 +}
1.59 +
1.60 +AudioParam::~AudioParam()
1.61 +{
1.62 + MOZ_ASSERT(mInputNodes.IsEmpty());
1.63 +}
1.64 +
1.65 +JSObject*
1.66 +AudioParam::WrapObject(JSContext* aCx)
1.67 +{
1.68 + return AudioParamBinding::Wrap(aCx, this);
1.69 +}
1.70 +
1.71 +void
1.72 +AudioParam::DisconnectFromGraphAndDestroyStream()
1.73 +{
1.74 + // Addref this temporarily so the refcount bumping below doesn't destroy us
1.75 + // prematurely
1.76 + nsRefPtr<AudioParam> kungFuDeathGrip = this;
1.77 +
1.78 + while (!mInputNodes.IsEmpty()) {
1.79 + uint32_t i = mInputNodes.Length() - 1;
1.80 + nsRefPtr<AudioNode> input = mInputNodes[i].mInputNode;
1.81 + mInputNodes.RemoveElementAt(i);
1.82 + input->RemoveOutputParam(this);
1.83 + }
1.84 +
1.85 + if (mNodeStreamPort) {
1.86 + mNodeStreamPort->Destroy();
1.87 + mNodeStreamPort = nullptr;
1.88 + }
1.89 +
1.90 + if (mStream) {
1.91 + mStream->Destroy();
1.92 + mStream = nullptr;
1.93 + }
1.94 +}
1.95 +
1.96 +MediaStream*
1.97 +AudioParam::Stream()
1.98 +{
1.99 + if (mStream) {
1.100 + return mStream;
1.101 + }
1.102 +
1.103 + AudioNodeEngine* engine = new AudioNodeEngine(nullptr);
1.104 + nsRefPtr<AudioNodeStream> stream =
1.105 + mNode->Context()->Graph()->CreateAudioNodeStream(engine,
1.106 + MediaStreamGraph::INTERNAL_STREAM,
1.107 + Node()->Context()->SampleRate());
1.108 +
1.109 + // Force the input to have only one channel, and make it down-mix using
1.110 + // the speaker rules if needed.
1.111 + stream->SetChannelMixingParametersImpl(1, ChannelCountMode::Explicit, ChannelInterpretation::Speakers);
1.112 + // Mark as an AudioParam helper stream
1.113 + stream->SetAudioParamHelperStream();
1.114 +
1.115 + mStream = stream.forget();
1.116 +
1.117 + // Setup the AudioParam's stream as an input to the owner AudioNode's stream
1.118 + MediaStream* nodeStream = mNode->Stream();
1.119 + MOZ_ASSERT(nodeStream->AsProcessedStream());
1.120 + ProcessedMediaStream* ps = static_cast<ProcessedMediaStream*>(nodeStream);
1.121 + mNodeStreamPort = ps->AllocateInputPort(mStream, MediaInputPort::FLAG_BLOCK_INPUT);
1.122 +
1.123 + // Let the MSG's copy of AudioParamTimeline know about the change in the stream
1.124 + mCallback(mNode);
1.125 +
1.126 + return mStream;
1.127 +}
1.128 +
1.129 +float
1.130 +AudioParamTimeline::AudioNodeInputValue(size_t aCounter) const
1.131 +{
1.132 + MOZ_ASSERT(mStream);
1.133 +
1.134 + // If we have a chunk produced by the AudioNode inputs to the AudioParam,
1.135 + // get its value now. We use aCounter to tell us which frame of the last
1.136 + // AudioChunk to look at.
1.137 + float audioNodeInputValue = 0.0f;
1.138 + const AudioChunk& lastAudioNodeChunk =
1.139 + static_cast<AudioNodeStream*>(mStream.get())->LastChunks()[0];
1.140 + if (!lastAudioNodeChunk.IsNull()) {
1.141 + MOZ_ASSERT(lastAudioNodeChunk.GetDuration() == WEBAUDIO_BLOCK_SIZE);
1.142 + audioNodeInputValue =
1.143 + static_cast<const float*>(lastAudioNodeChunk.mChannelData[0])[aCounter];
1.144 + audioNodeInputValue *= lastAudioNodeChunk.mVolume;
1.145 + }
1.146 +
1.147 + return audioNodeInputValue;
1.148 +}
1.149 +
1.150 +}
1.151 +}
1.152 +
