tor-browser

The Tor Browser
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ChannelSplitterNode.cpp (3860B)

      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 
      9 #include "AudioNodeEngine.h"
     10 #include "AudioNodeTrack.h"
     11 #include "Tracing.h"
     12 #include "mozilla/dom/ChannelSplitterNodeBinding.h"
     13 
     14 namespace mozilla::dom {
     15 
     16 class ChannelSplitterNodeEngine final : public AudioNodeEngine {
     17 public:
     18  explicit ChannelSplitterNodeEngine(ChannelSplitterNode* aNode)
     19      : AudioNodeEngine(aNode) {
     20    MOZ_ASSERT(NS_IsMainThread());
     21  }
     22 
     23  void ProcessBlocksOnPorts(AudioNodeTrack* aTrack, GraphTime aFrom,
     24                            Span<const AudioBlock> aInput,
     25                            Span<AudioBlock> aOutput,
     26                            bool* aFinished) override {
     27    MOZ_ASSERT(aInput.Length() == 1, "Should only have one input port");
     28    MOZ_ASSERT(aOutput.Length() == OutputCount());
     29    TRACE("ChannelSplitterNodeEngine::ProcessBlocksOnPorts");
     30 
     31    for (uint16_t i = 0; i < OutputCount(); ++i) {
     32      if (i < aInput[0].ChannelCount()) {
     33        // Split out existing channels
     34        aOutput[i].AllocateChannels(1);
     35        AudioBlockCopyChannelWithScale(
     36            static_cast<const float*>(aInput[0].mChannelData[i]),
     37            aInput[0].mVolume, aOutput[i].ChannelFloatsForWrite(0));
     38      } else {
     39        // Pad with silent channels if needed
     40        aOutput[i].SetNull(WEBAUDIO_BLOCK_SIZE);
     41      }
     42    }
     43  }
     44 
     45  size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override {
     46    return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
     47  }
     48 };
     49 
     50 ChannelSplitterNode::ChannelSplitterNode(AudioContext* aContext,
     51                                         uint16_t aOutputCount)
     52    : AudioNode(aContext, aOutputCount, ChannelCountMode::Explicit,
     53                ChannelInterpretation::Discrete),
     54      mOutputCount(aOutputCount) {
     55  mTrack =
     56      AudioNodeTrack::Create(aContext, new ChannelSplitterNodeEngine(this),
     57                             AudioNodeTrack::NO_TRACK_FLAGS, aContext->Graph());
     58 }
     59 
     60 /* static */
     61 already_AddRefed<ChannelSplitterNode> ChannelSplitterNode::Create(
     62    AudioContext& aAudioContext, const ChannelSplitterOptions& aOptions,
     63    ErrorResult& aRv) {
     64  if (aOptions.mNumberOfOutputs == 0 ||
     65      aOptions.mNumberOfOutputs > WebAudioUtils::MaxChannelCount) {
     66    aRv.ThrowIndexSizeError(nsPrintfCString(
     67        "%u is not a valid number of outputs", aOptions.mNumberOfOutputs));
     68    return nullptr;
     69  }
     70 
     71  RefPtr<ChannelSplitterNode> audioNode =
     72      new ChannelSplitterNode(&aAudioContext, aOptions.mNumberOfOutputs);
     73 
     74  // Manually check that the other options are valid, this node has
     75  // channelCount, channelCountMode and channelInterpretation constraints: they
     76  // cannot be changed from the default.
     77  if (aOptions.mChannelCount.WasPassed()) {
     78    audioNode->SetChannelCount(aOptions.mChannelCount.Value(), aRv);
     79    if (aRv.Failed()) {
     80      return nullptr;
     81    }
     82  }
     83  if (aOptions.mChannelInterpretation.WasPassed()) {
     84    audioNode->SetChannelInterpretationValue(
     85        aOptions.mChannelInterpretation.Value(), aRv);
     86    if (aRv.Failed()) {
     87      return nullptr;
     88    }
     89  }
     90  if (aOptions.mChannelCountMode.WasPassed()) {
     91    audioNode->SetChannelCountModeValue(aOptions.mChannelCountMode.Value(),
     92                                        aRv);
     93    if (aRv.Failed()) {
     94      return nullptr;
     95    }
     96  }
     97 
     98  return audioNode.forget();
     99 }
    100 
    101 JSObject* ChannelSplitterNode::WrapObject(JSContext* aCx,
    102                                          JS::Handle<JSObject*> aGivenProto) {
    103  return ChannelSplitterNode_Binding::Wrap(aCx, this, aGivenProto);
    104 }
    105 
    106 }  // namespace mozilla::dom