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/. */
6
7 #include "mozilla/dom/ChannelSplitterNode.h"
8 #include "mozilla/dom/ChannelSplitterNodeBinding.h"
9 #include "AudioNodeEngine.h"
10 #include "AudioNodeTrack.h"
11
12 namespace mozilla {
13 namespace dom {
14
15 class ChannelSplitterNodeEngine final : public AudioNodeEngine {
16 public:
ChannelSplitterNodeEngine(ChannelSplitterNode * aNode)17 explicit ChannelSplitterNodeEngine(ChannelSplitterNode* aNode)
18 : AudioNodeEngine(aNode) {
19 MOZ_ASSERT(NS_IsMainThread());
20 }
21
ProcessBlocksOnPorts(AudioNodeTrack * aTrack,GraphTime aFrom,Span<const AudioBlock> aInput,Span<AudioBlock> aOutput,bool * aFinished)22 void ProcessBlocksOnPorts(AudioNodeTrack* aTrack, GraphTime aFrom,
23 Span<const AudioBlock> aInput,
24 Span<AudioBlock> aOutput,
25 bool* aFinished) override {
26 MOZ_ASSERT(aInput.Length() == 1, "Should only have one input port");
27 MOZ_ASSERT(aOutput.Length() == OutputCount());
28
29 for (uint16_t i = 0; i < OutputCount(); ++i) {
30 if (i < aInput[0].ChannelCount()) {
31 // Split out existing channels
32 aOutput[i].AllocateChannels(1);
33 AudioBlockCopyChannelWithScale(
34 static_cast<const float*>(aInput[0].mChannelData[i]),
35 aInput[0].mVolume, aOutput[i].ChannelFloatsForWrite(0));
36 } else {
37 // Pad with silent channels if needed
38 aOutput[i].SetNull(WEBAUDIO_BLOCK_SIZE);
39 }
40 }
41 }
42
SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const43 size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override {
44 return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
45 }
46 };
47
ChannelSplitterNode(AudioContext * aContext,uint16_t aOutputCount)48 ChannelSplitterNode::ChannelSplitterNode(AudioContext* aContext,
49 uint16_t aOutputCount)
50 : AudioNode(aContext, aOutputCount, ChannelCountMode::Explicit,
51 ChannelInterpretation::Discrete),
52 mOutputCount(aOutputCount) {
53 mTrack =
54 AudioNodeTrack::Create(aContext, new ChannelSplitterNodeEngine(this),
55 AudioNodeTrack::NO_TRACK_FLAGS, aContext->Graph());
56 }
57
58 /* static */
Create(AudioContext & aAudioContext,const ChannelSplitterOptions & aOptions,ErrorResult & aRv)59 already_AddRefed<ChannelSplitterNode> ChannelSplitterNode::Create(
60 AudioContext& aAudioContext, const ChannelSplitterOptions& aOptions,
61 ErrorResult& aRv) {
62 if (aOptions.mNumberOfOutputs == 0 ||
63 aOptions.mNumberOfOutputs > WebAudioUtils::MaxChannelCount) {
64 aRv.ThrowIndexSizeError(nsPrintfCString(
65 "%u is not a valid number of outputs", aOptions.mNumberOfOutputs));
66 return nullptr;
67 }
68
69 RefPtr<ChannelSplitterNode> audioNode =
70 new ChannelSplitterNode(&aAudioContext, aOptions.mNumberOfOutputs);
71
72 // Manually check that the other options are valid, this node has
73 // channelCount, channelCountMode and channelInterpretation constraints: they
74 // cannot be changed from the default.
75 if (aOptions.mChannelCount.WasPassed()) {
76 audioNode->SetChannelCount(aOptions.mChannelCount.Value(), aRv);
77 if (aRv.Failed()) {
78 return nullptr;
79 }
80 }
81 if (aOptions.mChannelInterpretation.WasPassed()) {
82 audioNode->SetChannelInterpretationValue(
83 aOptions.mChannelInterpretation.Value(), aRv);
84 if (aRv.Failed()) {
85 return nullptr;
86 }
87 }
88 if (aOptions.mChannelCountMode.WasPassed()) {
89 audioNode->SetChannelCountModeValue(aOptions.mChannelCountMode.Value(),
90 aRv);
91 if (aRv.Failed()) {
92 return nullptr;
93 }
94 }
95
96 return audioNode.forget();
97 }
98
WrapObject(JSContext * aCx,JS::Handle<JSObject * > aGivenProto)99 JSObject* ChannelSplitterNode::WrapObject(JSContext* aCx,
100 JS::Handle<JSObject*> aGivenProto) {
101 return ChannelSplitterNode_Binding::Wrap(aCx, this, aGivenProto);
102 }
103
104 } // namespace dom
105 } // namespace mozilla
106