content/media/webaudio/ChannelSplitterNode.cpp@97036ab72558
content/media/webaudio/ChannelSplitterNode.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.
1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim:set ts=2 sw=2 sts=2 et cindent: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
7 #include "mozilla/dom/ChannelSplitterNode.h"
8 #include "mozilla/dom/ChannelSplitterNodeBinding.h"
9 #include "AudioNodeEngine.h"
10 #include "AudioNodeStream.h"
12 namespace mozilla {
13 namespace dom {
15 NS_IMPL_ISUPPORTS_INHERITED0(ChannelSplitterNode, AudioNode)
17 class ChannelSplitterNodeEngine : public AudioNodeEngine
18 {
19 public:
20 ChannelSplitterNodeEngine(ChannelSplitterNode* aNode)
21 : AudioNodeEngine(aNode)
22 {
23 MOZ_ASSERT(NS_IsMainThread());
24 }
26 virtual void ProcessBlocksOnPorts(AudioNodeStream* aStream,
27 const OutputChunks& aInput,
28 OutputChunks& aOutput,
29 bool* aFinished) MOZ_OVERRIDE
30 {
31 MOZ_ASSERT(aInput.Length() == 1, "Should only have one input port");
33 aOutput.SetLength(OutputCount());
34 for (uint16_t i = 0; i < OutputCount(); ++i) {
35 if (i < aInput[0].mChannelData.Length()) {
36 // Split out existing channels
37 AllocateAudioBlock(1, &aOutput[i]);
38 AudioBlockCopyChannelWithScale(
39 static_cast<const float*>(aInput[0].mChannelData[i]),
40 aInput[0].mVolume,
41 static_cast<float*>(const_cast<void*>(aOutput[i].mChannelData[0])));
42 } else {
43 // Pad with silent channels if needed
44 aOutput[i].SetNull(WEBAUDIO_BLOCK_SIZE);
45 }
46 }
47 }
49 virtual size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE
50 {
51 return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
52 }
53 };
55 ChannelSplitterNode::ChannelSplitterNode(AudioContext* aContext,
56 uint16_t aOutputCount)
57 : AudioNode(aContext,
58 2,
59 ChannelCountMode::Max,
60 ChannelInterpretation::Speakers)
61 , mOutputCount(aOutputCount)
62 {
63 mStream = aContext->Graph()->CreateAudioNodeStream(new ChannelSplitterNodeEngine(this),
64 MediaStreamGraph::INTERNAL_STREAM);
65 }
67 JSObject*
68 ChannelSplitterNode::WrapObject(JSContext* aCx)
69 {
70 return ChannelSplitterNodeBinding::Wrap(aCx, this);
71 }
73 }
74 }
