AudioScheduledSourceNode.cpp [plain text]
#include "config.h"
#if ENABLE(WEB_AUDIO)
#include "AudioScheduledSourceNode.h"
#include "AudioContext.h"
#include "AudioUtilities.h"
#include "Event.h"
#include "EventNames.h"
#include "ScriptController.h"
#include "ScriptExecutionContext.h"
#include <algorithm>
#include <wtf/IsoMallocInlines.h>
#include <wtf/MathExtras.h>
#include <wtf/Scope.h>
#if PLATFORM(IOS_FAMILY)
#include "ScriptController.h"
#endif
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(AudioScheduledSourceNode);
const double AudioScheduledSourceNode::UnknownTime = -1;
AudioScheduledSourceNode::AudioScheduledSourceNode(BaseAudioContext& context)
: AudioNode(context)
, ActiveDOMObject(context.scriptExecutionContext())
, m_endTime(UnknownTime)
{
suspendIfNeeded();
m_pendingActivity = makePendingActivity(*this);
}
void AudioScheduledSourceNode::updateSchedulingInfo(size_t quantumFrameSize, AudioBus& outputBus, size_t& quantumFrameOffset, size_t& nonSilentFramesToProcess)
{
nonSilentFramesToProcess = 0;
quantumFrameOffset = 0;
ASSERT(quantumFrameSize == AudioNode::ProcessingSizeInFrames);
if (quantumFrameSize != AudioNode::ProcessingSizeInFrames)
return;
double sampleRate = this->sampleRate();
size_t quantumStartFrame = context().currentSampleFrame();
size_t quantumEndFrame = quantumStartFrame + quantumFrameSize;
size_t startFrame = AudioUtilities::timeToSampleFrame(m_startTime, sampleRate);
size_t endFrame = m_endTime == UnknownTime ? 0 : AudioUtilities::timeToSampleFrame(m_endTime, sampleRate);
if (m_endTime != UnknownTime && endFrame <= quantumStartFrame)
finish();
if (m_playbackState == UNSCHEDULED_STATE || m_playbackState == FINISHED_STATE || startFrame >= quantumEndFrame) {
outputBus.zero();
return;
}
if (m_playbackState == SCHEDULED_STATE) {
m_playbackState = PLAYING_STATE;
context().incrementActiveSourceCount();
}
quantumFrameOffset = startFrame > quantumStartFrame ? startFrame - quantumStartFrame : 0;
quantumFrameOffset = std::min(quantumFrameOffset, quantumFrameSize); nonSilentFramesToProcess = quantumFrameSize - quantumFrameOffset;
if (!nonSilentFramesToProcess) {
outputBus.zero();
return;
}
if (quantumFrameOffset) {
for (unsigned i = 0; i < outputBus.numberOfChannels(); ++i)
memset(outputBus.channel(i)->mutableData(), 0, sizeof(float) * quantumFrameOffset);
}
if (m_endTime != UnknownTime && endFrame >= quantumStartFrame && endFrame < quantumEndFrame) {
size_t zeroStartFrame = endFrame - quantumStartFrame;
size_t framesToZero = quantumFrameSize - zeroStartFrame;
bool isSafe = zeroStartFrame < quantumFrameSize && framesToZero <= quantumFrameSize && zeroStartFrame + framesToZero <= quantumFrameSize;
ASSERT(isSafe);
if (isSafe) {
if (framesToZero > nonSilentFramesToProcess)
nonSilentFramesToProcess = 0;
else
nonSilentFramesToProcess -= framesToZero;
for (unsigned i = 0; i < outputBus.numberOfChannels(); ++i)
memset(outputBus.channel(i)->mutableData() + zeroStartFrame, 0, sizeof(float) * framesToZero);
}
finish();
}
}
ExceptionOr<void> AudioScheduledSourceNode::startLater(double when)
{
ASSERT(isMainThread());
ALWAYS_LOG(LOGIDENTIFIER, when);
context().nodeWillBeginPlayback();
if (m_playbackState != UNSCHEDULED_STATE)
return Exception { InvalidStateError };
if (!std::isfinite(when) || when < 0)
return Exception { RangeError, "when value should be positive"_s };
m_startTime = when;
m_playbackState = SCHEDULED_STATE;
return { };
}
ExceptionOr<void> AudioScheduledSourceNode::stopLater(double when)
{
ASSERT(isMainThread());
ALWAYS_LOG(LOGIDENTIFIER, when);
if (m_playbackState == UNSCHEDULED_STATE || m_endTime != UnknownTime)
return Exception { InvalidStateError };
if (!std::isfinite(when) || when < 0)
return Exception { RangeError, "when value should be positive"_s };
m_endTime = when;
return { };
}
void AudioScheduledSourceNode::didBecomeMarkedForDeletion()
{
ASSERT(context().isGraphOwner());
m_pendingActivity = nullptr;
ASSERT(!hasPendingActivity());
}
void AudioScheduledSourceNode::finish()
{
ASSERT(!hasFinished());
context().notifyNodeFinishedProcessing(this);
m_playbackState = FINISHED_STATE;
context().decrementActiveSourceCount();
context().postTask([this, protectedThis = makeRef(*this)] {
auto release = makeScopeExit([&] () {
AudioContext::AutoLocker locker(context());
m_pendingActivity = nullptr;
ASSERT(!hasPendingActivity());
});
if (context().isStopped())
return;
this->dispatchEvent(Event::create(eventNames().endedEvent, Event::CanBubble::No, Event::IsCancelable::No));
});
}
}
#endif // ENABLE(WEB_AUDIO)