gecko/content/media/webaudio/GainNode.cpp
Boris Zbarsky 35fca5eeeb Bug 991742 part 8. Remove the "aScope" argument of WebIDL/nsWrapperCache WrapObject() methods. r=bholley
This patch was mostly generated with the following command:

find . -name "*.h" -o -name "*.cpp" | xargs sed -e '/WrapObject(JSContext/ {; N; s/\(WrapObject(JSContext *\* *a\{0,1\}[Cc]x\),\n\{0,1\} *JS::Handle<JSObject\*> a\{0,1\}[sS]cope/\1/ ; }' -i ""

and then reverting the changes that made to
dom/bindings/BindingUtils.h, since those WrapObject methods are not
the ones we're trying to change here, plus a bunch of manual fixups
for cases that this command did not catch (including all the callsites
of WrapObject()).
2014-04-08 18:27:18 -04:00

138 lines
4.4 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "GainNode.h"
#include "mozilla/dom/GainNodeBinding.h"
#include "AudioNodeEngine.h"
#include "AudioNodeStream.h"
#include "AudioDestinationNode.h"
#include "WebAudioUtils.h"
namespace mozilla {
namespace dom {
NS_IMPL_CYCLE_COLLECTION_INHERITED_1(GainNode, AudioNode,
mGain)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(GainNode)
NS_INTERFACE_MAP_END_INHERITING(AudioNode)
NS_IMPL_ADDREF_INHERITED(GainNode, AudioNode)
NS_IMPL_RELEASE_INHERITED(GainNode, AudioNode)
class GainNodeEngine : public AudioNodeEngine
{
public:
GainNodeEngine(AudioNode* aNode, AudioDestinationNode* aDestination)
: AudioNodeEngine(aNode)
, mSource(nullptr)
, mDestination(static_cast<AudioNodeStream*> (aDestination->Stream()))
// Keep the default value in sync with the default value in GainNode::GainNode.
, mGain(1.f)
{
}
void SetSourceStream(AudioNodeStream* aSource)
{
mSource = aSource;
}
enum Parameters {
GAIN
};
void SetTimelineParameter(uint32_t aIndex,
const AudioParamTimeline& aValue,
TrackRate aSampleRate) MOZ_OVERRIDE
{
switch (aIndex) {
case GAIN:
MOZ_ASSERT(mSource && mDestination);
mGain = aValue;
WebAudioUtils::ConvertAudioParamToTicks(mGain, mSource, mDestination);
break;
default:
NS_ERROR("Bad GainNodeEngine TimelineParameter");
}
}
virtual void ProcessBlock(AudioNodeStream* aStream,
const AudioChunk& aInput,
AudioChunk* aOutput,
bool* aFinished)
{
MOZ_ASSERT(mSource == aStream, "Invalid source stream");
if (aInput.IsNull()) {
// If input is silent, so is the output
aOutput->SetNull(WEBAUDIO_BLOCK_SIZE);
} else if (mGain.HasSimpleValue()) {
// Optimize the case where we only have a single value set as the volume
float gain = mGain.GetValue();
if (gain == 0.0f) {
aOutput->SetNull(WEBAUDIO_BLOCK_SIZE);
} else {
*aOutput = aInput;
aOutput->mVolume *= gain;
}
} else {
// First, compute a vector of gains for each track tick based on the
// timeline at hand, and then for each channel, multiply the values
// in the buffer with the gain vector.
AllocateAudioBlock(aInput.mChannelData.Length(), aOutput);
// Compute the gain values for the duration of the input AudioChunk
// XXX we need to add a method to AudioEventTimeline to compute this buffer directly.
float computedGain[WEBAUDIO_BLOCK_SIZE];
for (size_t counter = 0; counter < WEBAUDIO_BLOCK_SIZE; ++counter) {
TrackTicks tick = aStream->GetCurrentPosition();
computedGain[counter] = mGain.GetValueAtTime(tick, counter) * aInput.mVolume;
}
// Apply the gain to the output buffer
for (size_t channel = 0; channel < aOutput->mChannelData.Length(); ++channel) {
const float* inputBuffer = static_cast<const float*> (aInput.mChannelData[channel]);
float* buffer = static_cast<float*> (const_cast<void*>
(aOutput->mChannelData[channel]));
AudioBlockCopyChannelWithScale(inputBuffer, computedGain, buffer);
}
}
}
AudioNodeStream* mSource;
AudioNodeStream* mDestination;
AudioParamTimeline mGain;
};
GainNode::GainNode(AudioContext* aContext)
: AudioNode(aContext,
2,
ChannelCountMode::Max,
ChannelInterpretation::Speakers)
, mGain(new AudioParam(MOZ_THIS_IN_INITIALIZER_LIST(),
SendGainToStream, 1.0f))
{
GainNodeEngine* engine = new GainNodeEngine(this, aContext->Destination());
mStream = aContext->Graph()->CreateAudioNodeStream(engine, MediaStreamGraph::INTERNAL_STREAM);
engine->SetSourceStream(static_cast<AudioNodeStream*> (mStream.get()));
}
JSObject*
GainNode::WrapObject(JSContext* aCx)
{
return GainNodeBinding::Wrap(aCx, this);
}
void
GainNode::SendGainToStream(AudioNode* aNode)
{
GainNode* This = static_cast<GainNode*>(aNode);
SendTimelineParameterToStream(This, GainNodeEngine::GAIN, *This->mGain);
}
}
}