content/media/webaudio/AudioParam.cpp@6474c204b198 (annotated)
content/media/webaudio/AudioParam.cpp
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| michael@0 | 2 | /* vim:set ts=2 sw=2 sts=2 et cindent: */ |
| michael@0 | 3 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 4 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 5 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 6 | |
| michael@0 | 7 | #include "AudioParam.h" |
| michael@0 | 8 | #include "mozilla/dom/AudioParamBinding.h" |
| michael@0 | 9 | #include "AudioNodeEngine.h" |
| michael@0 | 10 | #include "AudioNodeStream.h" |
| michael@0 | 11 | #include "AudioContext.h" |
| michael@0 | 12 | |
| michael@0 | 13 | namespace mozilla { |
| michael@0 | 14 | namespace dom { |
| michael@0 | 15 | |
| michael@0 | 16 | NS_IMPL_CYCLE_COLLECTION_CLASS(AudioParam) |
| michael@0 | 17 | |
| michael@0 | 18 | NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(AudioParam) |
| michael@0 | 19 | tmp->DisconnectFromGraphAndDestroyStream(); |
| michael@0 | 20 | NS_IMPL_CYCLE_COLLECTION_UNLINK(mNode) |
| michael@0 | 21 | NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER |
| michael@0 | 22 | NS_IMPL_CYCLE_COLLECTION_UNLINK_END |
| michael@0 | 23 | NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(AudioParam) |
| michael@0 | 24 | NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mNode) |
| michael@0 | 25 | NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS |
| michael@0 | 26 | NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END |
| michael@0 | 27 | |
| michael@0 | 28 | NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(AudioParam) |
| michael@0 | 29 | |
| michael@0 | 30 | NS_IMPL_CYCLE_COLLECTING_NATIVE_ADDREF(AudioParam) |
| michael@0 | 31 | |
| michael@0 | 32 | NS_IMETHODIMP_(MozExternalRefCountType) |
| michael@0 | 33 | AudioParam::Release() |
| michael@0 | 34 | { |
| michael@0 | 35 | if (mRefCnt.get() == 1) { |
| michael@0 | 36 | // We are about to be deleted, disconnect the object from the graph before |
| michael@0 | 37 | // the derived type is destroyed. |
| michael@0 | 38 | DisconnectFromGraphAndDestroyStream(); |
| michael@0 | 39 | } |
| michael@0 | 40 | NS_IMPL_CC_NATIVE_RELEASE_BODY(AudioParam) |
| michael@0 | 41 | } |
| michael@0 | 42 | |
| michael@0 | 43 | NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(AudioParam, AddRef) |
| michael@0 | 44 | NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(AudioParam, Release) |
| michael@0 | 45 | |
| michael@0 | 46 | AudioParam::AudioParam(AudioNode* aNode, |
| michael@0 | 47 | AudioParam::CallbackType aCallback, |
| michael@0 | 48 | float aDefaultValue) |
| michael@0 | 49 | : AudioParamTimeline(aDefaultValue) |
| michael@0 | 50 | , mNode(aNode) |
| michael@0 | 51 | , mCallback(aCallback) |
| michael@0 | 52 | , mDefaultValue(aDefaultValue) |
| michael@0 | 53 | { |
| michael@0 | 54 | SetIsDOMBinding(); |
| michael@0 | 55 | } |
| michael@0 | 56 | |
| michael@0 | 57 | AudioParam::~AudioParam() |
| michael@0 | 58 | { |
| michael@0 | 59 | MOZ_ASSERT(mInputNodes.IsEmpty()); |
| michael@0 | 60 | } |
| michael@0 | 61 | |
| michael@0 | 62 | JSObject* |
| michael@0 | 63 | AudioParam::WrapObject(JSContext* aCx) |
| michael@0 | 64 | { |
| michael@0 | 65 | return AudioParamBinding::Wrap(aCx, this); |
| michael@0 | 66 | } |
| michael@0 | 67 | |
| michael@0 | 68 | void |
| michael@0 | 69 | AudioParam::DisconnectFromGraphAndDestroyStream() |
| michael@0 | 70 | { |
| michael@0 | 71 | // Addref this temporarily so the refcount bumping below doesn't destroy us |
| michael@0 | 72 | // prematurely |
| michael@0 | 73 | nsRefPtr<AudioParam> kungFuDeathGrip = this; |
| michael@0 | 74 | |
| michael@0 | 75 | while (!mInputNodes.IsEmpty()) { |
| michael@0 | 76 | uint32_t i = mInputNodes.Length() - 1; |
| michael@0 | 77 | nsRefPtr<AudioNode> input = mInputNodes[i].mInputNode; |
| michael@0 | 78 | mInputNodes.RemoveElementAt(i); |
| michael@0 | 79 | input->RemoveOutputParam(this); |
| michael@0 | 80 | } |
| michael@0 | 81 | |
| michael@0 | 82 | if (mNodeStreamPort) { |
| michael@0 | 83 | mNodeStreamPort->Destroy(); |
| michael@0 | 84 | mNodeStreamPort = nullptr; |
| michael@0 | 85 | } |
| michael@0 | 86 | |
| michael@0 | 87 | if (mStream) { |
| michael@0 | 88 | mStream->Destroy(); |
| michael@0 | 89 | mStream = nullptr; |
| michael@0 | 90 | } |
| michael@0 | 91 | } |
| michael@0 | 92 | |
| michael@0 | 93 | MediaStream* |
| michael@0 | 94 | AudioParam::Stream() |
| michael@0 | 95 | { |
| michael@0 | 96 | if (mStream) { |
| michael@0 | 97 | return mStream; |
| michael@0 | 98 | } |
| michael@0 | 99 | |
| michael@0 | 100 | AudioNodeEngine* engine = new AudioNodeEngine(nullptr); |
| michael@0 | 101 | nsRefPtr<AudioNodeStream> stream = |
| michael@0 | 102 | mNode->Context()->Graph()->CreateAudioNodeStream(engine, |
| michael@0 | 103 | MediaStreamGraph::INTERNAL_STREAM, |
| michael@0 | 104 | Node()->Context()->SampleRate()); |
| michael@0 | 105 | |
| michael@0 | 106 | // Force the input to have only one channel, and make it down-mix using |
| michael@0 | 107 | // the speaker rules if needed. |
| michael@0 | 108 | stream->SetChannelMixingParametersImpl(1, ChannelCountMode::Explicit, ChannelInterpretation::Speakers); |
| michael@0 | 109 | // Mark as an AudioParam helper stream |
| michael@0 | 110 | stream->SetAudioParamHelperStream(); |
| michael@0 | 111 | |
| michael@0 | 112 | mStream = stream.forget(); |
| michael@0 | 113 | |
| michael@0 | 114 | // Setup the AudioParam's stream as an input to the owner AudioNode's stream |
| michael@0 | 115 | MediaStream* nodeStream = mNode->Stream(); |
| michael@0 | 116 | MOZ_ASSERT(nodeStream->AsProcessedStream()); |
| michael@0 | 117 | ProcessedMediaStream* ps = static_cast<ProcessedMediaStream*>(nodeStream); |
| michael@0 | 118 | mNodeStreamPort = ps->AllocateInputPort(mStream, MediaInputPort::FLAG_BLOCK_INPUT); |
| michael@0 | 119 | |
| michael@0 | 120 | // Let the MSG's copy of AudioParamTimeline know about the change in the stream |
| michael@0 | 121 | mCallback(mNode); |
| michael@0 | 122 | |
| michael@0 | 123 | return mStream; |
| michael@0 | 124 | } |
| michael@0 | 125 | |
| michael@0 | 126 | float |
| michael@0 | 127 | AudioParamTimeline::AudioNodeInputValue(size_t aCounter) const |
| michael@0 | 128 | { |
| michael@0 | 129 | MOZ_ASSERT(mStream); |
| michael@0 | 130 | |
| michael@0 | 131 | // If we have a chunk produced by the AudioNode inputs to the AudioParam, |
| michael@0 | 132 | // get its value now. We use aCounter to tell us which frame of the last |
| michael@0 | 133 | // AudioChunk to look at. |
| michael@0 | 134 | float audioNodeInputValue = 0.0f; |
| michael@0 | 135 | const AudioChunk& lastAudioNodeChunk = |
| michael@0 | 136 | static_cast<AudioNodeStream*>(mStream.get())->LastChunks()[0]; |
| michael@0 | 137 | if (!lastAudioNodeChunk.IsNull()) { |
| michael@0 | 138 | MOZ_ASSERT(lastAudioNodeChunk.GetDuration() == WEBAUDIO_BLOCK_SIZE); |
| michael@0 | 139 | audioNodeInputValue = |
| michael@0 | 140 | static_cast<const float*>(lastAudioNodeChunk.mChannelData[0])[aCounter]; |
| michael@0 | 141 | audioNodeInputValue *= lastAudioNodeChunk.mVolume; |
| michael@0 | 142 | } |
| michael@0 | 143 | |
| michael@0 | 144 | return audioNodeInputValue; |
| michael@0 | 145 | } |
| michael@0 | 146 | |
| michael@0 | 147 | } |
| michael@0 | 148 | } |
| michael@0 | 149 |
