content/media/webaudio/ChannelMergerNode.cpp@97036ab72558 (annotated)
content/media/webaudio/ChannelMergerNode.cpp
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
| 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 "mozilla/dom/ChannelMergerNode.h" |
| michael@0 | 8 | #include "mozilla/dom/ChannelMergerNodeBinding.h" |
| michael@0 | 9 | #include "AudioNodeEngine.h" |
| michael@0 | 10 | #include "AudioNodeStream.h" |
| michael@0 | 11 | |
| michael@0 | 12 | namespace mozilla { |
| michael@0 | 13 | namespace dom { |
| michael@0 | 14 | |
| michael@0 | 15 | NS_IMPL_ISUPPORTS_INHERITED0(ChannelMergerNode, AudioNode) |
| michael@0 | 16 | |
| michael@0 | 17 | class ChannelMergerNodeEngine : public AudioNodeEngine |
| michael@0 | 18 | { |
| michael@0 | 19 | public: |
| michael@0 | 20 | ChannelMergerNodeEngine(ChannelMergerNode* aNode) |
| michael@0 | 21 | : AudioNodeEngine(aNode) |
| michael@0 | 22 | { |
| michael@0 | 23 | MOZ_ASSERT(NS_IsMainThread()); |
| michael@0 | 24 | } |
| michael@0 | 25 | |
| michael@0 | 26 | virtual void ProcessBlocksOnPorts(AudioNodeStream* aStream, |
| michael@0 | 27 | const OutputChunks& aInput, |
| michael@0 | 28 | OutputChunks& aOutput, |
| michael@0 | 29 | bool* aFinished) MOZ_OVERRIDE |
| michael@0 | 30 | { |
| michael@0 | 31 | MOZ_ASSERT(aInput.Length() >= 1, "Should have one or more input ports"); |
| michael@0 | 32 | |
| michael@0 | 33 | // Get the number of output channels, and allocate it |
| michael@0 | 34 | uint32_t channelCount = 0; |
| michael@0 | 35 | for (uint16_t i = 0; i < InputCount(); ++i) { |
| michael@0 | 36 | channelCount += aInput[i].mChannelData.Length(); |
| michael@0 | 37 | } |
| michael@0 | 38 | if (channelCount == 0) { |
| michael@0 | 39 | aOutput[0].SetNull(WEBAUDIO_BLOCK_SIZE); |
| michael@0 | 40 | return; |
| michael@0 | 41 | } |
| michael@0 | 42 | channelCount = std::min(channelCount, WebAudioUtils::MaxChannelCount); |
| michael@0 | 43 | AllocateAudioBlock(channelCount, &aOutput[0]); |
| michael@0 | 44 | |
| michael@0 | 45 | // Append each channel in each input to the output |
| michael@0 | 46 | uint32_t channelIndex = 0; |
| michael@0 | 47 | for (uint16_t i = 0; true; ++i) { |
| michael@0 | 48 | MOZ_ASSERT(i < InputCount()); |
| michael@0 | 49 | for (uint32_t j = 0; j < aInput[i].mChannelData.Length(); ++j) { |
| michael@0 | 50 | AudioBlockCopyChannelWithScale( |
| michael@0 | 51 | static_cast<const float*>(aInput[i].mChannelData[j]), |
| michael@0 | 52 | aInput[i].mVolume, |
| michael@0 | 53 | static_cast<float*>(const_cast<void*>(aOutput[0].mChannelData[channelIndex]))); |
| michael@0 | 54 | ++channelIndex; |
| michael@0 | 55 | if (channelIndex >= channelCount) { |
| michael@0 | 56 | return; |
| michael@0 | 57 | } |
| michael@0 | 58 | } |
| michael@0 | 59 | } |
| michael@0 | 60 | } |
| michael@0 | 61 | |
| michael@0 | 62 | virtual size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE |
| michael@0 | 63 | { |
| michael@0 | 64 | return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf); |
| michael@0 | 65 | } |
| michael@0 | 66 | }; |
| michael@0 | 67 | |
| michael@0 | 68 | ChannelMergerNode::ChannelMergerNode(AudioContext* aContext, |
| michael@0 | 69 | uint16_t aInputCount) |
| michael@0 | 70 | : AudioNode(aContext, |
| michael@0 | 71 | 2, |
| michael@0 | 72 | ChannelCountMode::Max, |
| michael@0 | 73 | ChannelInterpretation::Speakers) |
| michael@0 | 74 | , mInputCount(aInputCount) |
| michael@0 | 75 | { |
| michael@0 | 76 | mStream = aContext->Graph()->CreateAudioNodeStream(new ChannelMergerNodeEngine(this), |
| michael@0 | 77 | MediaStreamGraph::INTERNAL_STREAM); |
| michael@0 | 78 | } |
| michael@0 | 79 | |
| michael@0 | 80 | JSObject* |
| michael@0 | 81 | ChannelMergerNode::WrapObject(JSContext* aCx) |
| michael@0 | 82 | { |
| michael@0 | 83 | return ChannelMergerNodeBinding::Wrap(aCx, this); |
| michael@0 | 84 | } |
| michael@0 | 85 | |
| michael@0 | 86 | } |
| michael@0 | 87 | } |
| michael@0 | 88 |
