// Constructor for rendering to the audio hardware.
AudioContext::AudioContext(Document& document)
: ActiveDOMObject(&document)
, m_isStopScheduled(false)
, m_isInitialized(false)
, m_isAudioThreadFinished(false)
, m_destinationNode(0)
, m_isDeletionScheduled(false)
, m_automaticPullNodesNeedUpdating(false)
, m_connectionCount(0)
, m_audioThread(0)
, m_graphOwnerThread(UndefinedThreadIdentifier)
, m_isOfflineContext(false)
, m_activeSourceCount(0)
, m_restrictions(NoRestrictions)
{
constructCommon();
m_destinationNode = DefaultAudioDestinationNode::create(this);
// This sets in motion an asynchronous loading mechanism on another thread.
// We can check m_hrtfDatabaseLoader->isLoaded() to find out whether or not it has been fully loaded.
// It's not that useful to have a callback function for this since the audio thread automatically starts rendering on the graph
// when this has finished (see AudioDestinationNode).
m_hrtfDatabaseLoader = HRTFDatabaseLoader::createAndLoadAsynchronouslyIfNecessary(sampleRate());
}
// Constructor for rendering to the audio hardware.
AudioContext::AudioContext(Document* document)
: ActiveDOMObject(document, this)
, m_isInitialized(false)
, m_isAudioThreadFinished(false)
, m_document(document)
, m_destinationNode(0)
, m_connectionCount(0)
, m_audioThread(0)
, m_graphOwnerThread(UndefinedThreadIdentifier)
, m_isOfflineContext(false)
{
constructCommon();
m_destinationNode = DefaultAudioDestinationNode::create(this);
// This sets in motion an asynchronous loading mechanism on another thread.
// We can check m_hrtfDatabaseLoader->isLoaded() to find out whether or not it has been fully loaded.
// It's not that useful to have a callback function for this since the audio thread automatically starts rendering on the graph
// when this has finished (see AudioDestinationNode).
m_hrtfDatabaseLoader = HRTFDatabaseLoader::createAndLoadAsynchronouslyIfNecessary(sampleRate());
// FIXME: for now default AudioContext does not need an explicit startRendering() call.
// We may want to consider requiring it for symmetry with OfflineAudioContext
m_destinationNode->startRendering();
}
// Constructor for offline (non-realtime) rendering.
AudioContext::AudioContext(Document& document, unsigned numberOfChannels, size_t numberOfFrames, float sampleRate)
: ActiveDOMObject(&document)
, m_isOfflineContext(true)
, m_mediaSession(PlatformMediaSession::create(*this))
, m_eventQueue(std::make_unique<GenericEventQueue>(*this))
, m_graphOwnerThread(UndefinedThreadIdentifier)
{
constructCommon();
// Create a new destination for offline rendering.
m_renderTarget = AudioBuffer::create(numberOfChannels, numberOfFrames, sampleRate);
m_destinationNode = OfflineAudioDestinationNode::create(this, m_renderTarget.get());
}
// Constructor for rendering to the audio hardware.
AudioContext::AudioContext(Document& document)
: ActiveDOMObject(&document)
, m_mediaSession(PlatformMediaSession::create(*this))
, m_eventQueue(std::make_unique<GenericEventQueue>(*this))
, m_graphOwnerThread(UndefinedThreadIdentifier)
{
constructCommon();
m_destinationNode = DefaultAudioDestinationNode::create(this);
// Initialize the destination node's muted state to match the page's current muted state.
pageMutedStateDidChange();
}
// Constructor for offline (non-realtime) rendering.
AudioContext::AudioContext(Document* document, unsigned numberOfChannels, size_t numberOfFrames, double sampleRate)
: ActiveDOMObject(document, this)
, m_isInitialized(false)
, m_isAudioThreadFinished(false)
, m_document(document)
, m_destinationNode(0)
, m_connectionCount(0)
, m_audioThread(0)
, m_graphOwnerThread(UndefinedThreadIdentifier)
, m_isOfflineContext(true)
{
constructCommon();
// FIXME: the passed in sampleRate MUST match the hardware sample-rate since HRTFDatabaseLoader is a singleton.
m_hrtfDatabaseLoader = HRTFDatabaseLoader::createAndLoadAsynchronouslyIfNecessary(sampleRate);
// Create a new destination for offline rendering.
m_renderTarget = AudioBuffer::create(numberOfChannels, numberOfFrames, sampleRate);
m_destinationNode = OfflineAudioDestinationNode::create(this, m_renderTarget.get());
}
