AbstractAudioContext* AudioContext::create(Document& document, ExceptionState& exceptionState)
{
ASSERT(isMainThread());
if (s_hardwareContextCount >= MaxHardwareContexts) {
exceptionState.throwDOMException(
NotSupportedError,
ExceptionMessages::indexExceedsMaximumBound(
"number of hardware contexts",
s_hardwareContextCount,
MaxHardwareContexts));
return nullptr;
}
AudioContext* audioContext = new AudioContext(document);
audioContext->suspendIfNeeded();
// This starts the audio thread. The destination node's
// provideInput() method will now be called repeatedly to render
// audio. Each time provideInput() is called, a portion of the
// audio stream is rendered. Let's call this time period a "render
// quantum". NOTE: for now AudioContext does not need an explicit
// startRendering() call from JavaScript. We may want to consider
// requiring it for symmetry with OfflineAudioContext.
audioContext->startRendering();
++s_hardwareContextCount;
#if DEBUG_AUDIONODE_REFERENCES
fprintf(stderr, "%p: AudioContext::AudioContext(): %u #%u\n",
audioContext, audioContext->m_contextId, s_hardwareContextCount);
#endif
return audioContext;
}
WaveShaperNode::WaveShaperNode(AudioContext& context)
: AudioBasicProcessorNode(context, context.sampleRate())
{
m_processor = std::make_unique<WaveShaperProcessor>(context.sampleRate(), 1);
setNodeType(NodeTypeWaveShaper);
initialize();
}
void AudioContext::uninitializeDispatch(void* userData)
{
AudioContext* context = reinterpret_cast<AudioContext*>(userData);
ASSERT(context);
if (!context)
return;
context->uninitialize();
}
void AudioContext::deleteMarkedNodesDispatch(void* userData)
{
AudioContext* context = reinterpret_cast<AudioContext*>(userData);
ASSERT(context);
if (!context)
return;
context->deleteMarkedNodes();
context->deref();
}
// Sets up |output| iff buffers are set in event handlers.
void DispatchAudioProcessEvent(ScriptProcessorNode* aNode,
AudioChunk* aOutput)
{
AudioContext* context = aNode->Context();
if (!context) {
return;
}
AutoJSAPI jsapi;
if (NS_WARN_IF(!jsapi.Init(aNode->GetOwner()))) {
return;
}
JSContext* cx = jsapi.cx();
uint32_t inputChannelCount = aNode->ChannelCount();
// Create the input buffer
RefPtr<AudioBuffer> inputBuffer;
if (mInputBuffer) {
ErrorResult rv;
inputBuffer =
AudioBuffer::Create(context->GetOwner(), inputChannelCount,
aNode->BufferSize(), context->SampleRate(),
mInputBuffer.forget(), rv);
if (rv.Failed()) {
rv.SuppressException();
return;
}
}
// Ask content to produce data in the output buffer
// Note that we always avoid creating the output buffer here, and we try to
// avoid creating the input buffer as well. The AudioProcessingEvent class
// knows how to lazily create them if needed once the script tries to access
// them. Otherwise, we may be able to get away without creating them!
RefPtr<AudioProcessingEvent> event =
new AudioProcessingEvent(aNode, nullptr, nullptr);
event->InitEvent(inputBuffer, inputChannelCount, mPlaybackTime);
aNode->DispatchTrustedEvent(event);
// Steal the output buffers if they have been set.
// Don't create a buffer if it hasn't been used to return output;
// FinishProducingOutputBuffer() will optimize output = null.
// GetThreadSharedChannelsForRate() may also return null after OOM.
if (event->HasOutputBuffer()) {
ErrorResult rv;
AudioBuffer* buffer = event->GetOutputBuffer(rv);
// HasOutputBuffer() returning true means that GetOutputBuffer()
// will not fail.
MOZ_ASSERT(!rv.Failed());
*aOutput = buffer->GetThreadSharedChannelsForRate(cx);
MOZ_ASSERT(aOutput->IsNull() ||
aOutput->mBufferFormat == AUDIO_FORMAT_FLOAT32,
"AudioBuffers initialized from JS have float data");
}
}
/* static */
already_AddRefed<AudioNodeExternalInputStream>
AudioNodeExternalInputStream::Create(MediaStreamGraph* aGraph,
AudioNodeEngine* aEngine) {
AudioContext* ctx = aEngine->NodeMainThread()->Context();
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aGraph->GraphRate() == ctx->SampleRate());
RefPtr<AudioNodeExternalInputStream> stream =
new AudioNodeExternalInputStream(aEngine, aGraph->GraphRate());
stream->mSuspendedCount += ctx->ShouldSuspendNewStream();
aGraph->AddStream(stream);
return stream.forget();
}
v8::Handle<v8::Value> V8AudioContext::createBufferCallback(const v8::Arguments& args)
{
if (args.Length() < 2)
return throwError("Not enough arguments", V8Proxy::SyntaxError);
AudioContext* audioContext = toNative(args.Holder());
ASSERT(audioContext);
v8::Handle<v8::Value> arg = args[0];
// AudioBuffer createBuffer(in ArrayBuffer buffer, in boolean mixToMono);
if (V8ArrayBuffer::HasInstance(arg)) {
v8::Handle<v8::Object> object = v8::Handle<v8::Object>::Cast(arg);
ArrayBuffer* arrayBuffer = V8ArrayBuffer::toNative(object);
ASSERT(arrayBuffer);
if (arrayBuffer) {
bool mixToMono = args[1]->ToBoolean()->Value();
RefPtr<AudioBuffer> audioBuffer = audioContext->createBuffer(arrayBuffer, mixToMono);
if (!audioBuffer.get())
return throwError("Error decoding audio file data", V8Proxy::SyntaxError);
return toV8(audioBuffer.get());
}
return v8::Undefined();
}
// AudioBuffer createBuffer(in unsigned long numberOfChannels, in unsigned long numberOfFrames, in float sampleRate);
if (args.Length() < 3)
return throwError("Not enough arguments", V8Proxy::SyntaxError);
bool ok = false;
int32_t numberOfChannels = toInt32(args[0], ok);
if (!ok || numberOfChannels <= 0 || numberOfChannels > 10)
return throwError("Invalid number of channels", V8Proxy::SyntaxError);
int32_t numberOfFrames = toInt32(args[1], ok);
if (!ok || numberOfFrames <= 0)
return throwError("Invalid number of frames", V8Proxy::SyntaxError);
float sampleRate = toFloat(args[2]);
RefPtr<AudioBuffer> audioBuffer = audioContext->createBuffer(numberOfChannels, numberOfFrames, sampleRate);
if (!audioBuffer.get())
return throwError("Error creating AudioBuffer", V8Proxy::SyntaxError);
return toV8(audioBuffer.get());
}
JSValue JSAudioContext::createBuffer(ExecState* exec)
{
if (exec->argumentCount() < 2)
return throwError(exec, createSyntaxError(exec, "Not enough arguments"));
AudioContext* audioContext = static_cast<AudioContext*>(impl());
ASSERT(audioContext);
// AudioBuffer createBuffer(in ArrayBuffer buffer, in boolean mixToMono);
JSValue val = exec->argument(0);
if (val.inherits(&JSArrayBuffer::s_info)) {
ArrayBuffer* arrayBuffer = toArrayBuffer(val);
ASSERT(arrayBuffer);
if (arrayBuffer) {
bool mixToMono = exec->argument(1).toBoolean(exec);
RefPtr<AudioBuffer> audioBuffer = audioContext->createBuffer(arrayBuffer, mixToMono);
if (!audioBuffer.get())
return throwError(exec, createSyntaxError(exec, "Error decoding audio file data"));
return toJS(exec, globalObject(), audioBuffer.get());
}
return jsUndefined();
}
// AudioBuffer createBuffer(in unsigned long numberOfChannels, in unsigned long numberOfFrames, in float sampleRate);
if (exec->argumentCount() < 3)
return throwError(exec, createSyntaxError(exec, "Not enough arguments"));
int32_t numberOfChannels = exec->argument(0).toInt32(exec);
int32_t numberOfFrames = exec->argument(1).toInt32(exec);
float sampleRate = exec->argument(2).toFloat(exec);
if (numberOfChannels <= 0 || numberOfChannels > 10)
return throwError(exec, createSyntaxError(exec, "Invalid number of channels"));
if (numberOfFrames <= 0)
return throwError(exec, createSyntaxError(exec, "Invalid number of frames"));
if (sampleRate <= 0)
return throwError(exec, createSyntaxError(exec, "Invalid sample rate"));
RefPtr<AudioBuffer> audioBuffer = audioContext->createBuffer(numberOfChannels, numberOfFrames, sampleRate);
if (!audioBuffer.get())
return throwError(exec, createSyntaxError(exec, "Error creating AudioBuffer"));
return toJS(exec, globalObject(), audioBuffer.get());
}
AudioContext* AudioContext::create(Document& document, ExceptionState& exceptionState)
{
ASSERT(isMainThread());
if (s_hardwareContextCount >= MaxHardwareContexts) {
exceptionState.throwDOMException(
NotSupportedError,
ExceptionMessages::indexExceedsMaximumBound(
"number of hardware contexts",
s_hardwareContextCount,
MaxHardwareContexts));
return nullptr;
}
AudioContext* audioContext = new AudioContext(&document);
audioContext->suspendIfNeeded();
return audioContext;
}
float AudioParamTimeline::valueForContextTime(AudioContext& context, float defaultValue, bool& hasValue)
{
{
std::unique_lock<Lock> lock(m_eventsMutex, std::try_to_lock);
if (!lock.owns_lock() || !m_events.size() || context.currentTime() < m_events[0].time()) {
hasValue = false;
return defaultValue;
}
}
// Ask for just a single value.
float value;
double sampleRate = context.sampleRate();
double startTime = context.currentTime();
double endTime = startTime + 1.1 / sampleRate; // time just beyond one sample-frame
double controlRate = sampleRate / AudioNode::ProcessingSizeInFrames; // one parameter change per render quantum
value = valuesForTimeRange(startTime, endTime, defaultValue, &value, 1, sampleRate, controlRate);
hasValue = true;
return value;
}
MediaElementAudioSourceNode::MediaElementAudioSourceNode(AudioContext& context, HTMLMediaElement& mediaElement)
: AudioNode(context, context.sampleRate())
, m_mediaElement(mediaElement)
, m_sourceNumberOfChannels(0)
, m_sourceSampleRate(0)
{
// Default to stereo. This could change depending on what the media element .src is set to.
addOutput(std::make_unique<AudioNodeOutput>(this, 2));
setNodeType(NodeTypeMediaElementAudioSource);
initialize();
}
/* static */ already_AddRefed<MediaStreamAudioDestinationNode>
MediaStreamAudioDestinationNode::Create(AudioContext& aAudioContext,
const AudioNodeOptions& aOptions,
ErrorResult& aRv)
{
if (aAudioContext.IsOffline()) {
aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
return nullptr;
}
if (aAudioContext.CheckClosed(aRv)) {
return nullptr;
}
RefPtr<MediaStreamAudioDestinationNode> audioNode =
new MediaStreamAudioDestinationNode(&aAudioContext);
audioNode->Initialize(aOptions, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
return audioNode.forget();
}
/* static */ already_AddRefed<AudioBuffer>
AudioBuffer::Constructor(const GlobalObject& aGlobal,
AudioContext& aAudioContext,
const AudioBufferOptions& aOptions,
ErrorResult& aRv)
{
if (!aOptions.mNumberOfChannels) {
aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return nullptr;
}
float sampleRate = aOptions.mSampleRate.WasPassed()
? aOptions.mSampleRate.Value()
: aAudioContext.SampleRate();
return Create(&aAudioContext, aOptions.mNumberOfChannels, aOptions.mLength,
sampleRate, aRv);
}
Ref<AudioBuffer> AudioBuffer::read(AudioContext& context, const std::string& sampleName)
{
ResourceCache& cache = context.cache();
std::string name;
name += "sample:";
name += sampleName;
if (Ref<AudioBuffer> buffer = cache.find<AudioBuffer>(name))
return buffer;
Ref<Sample> data = Sample::read(cache, sampleName);
if (!data)
{
logError("Failed to read sample for buffer %s", name.c_str());
return nullptr;
}
return create(ResourceInfo(cache, name), context, *data);
}
PannerNode::PannerNode(AudioContext& context, float sampleRate)
: AudioNode(context, sampleRate)
, m_panningModel(PanningModelType::HRTF)
, m_lastGain(-1.0)
, m_connectionCount(0)
{
// Load the HRTF database asynchronously so we don't block the Javascript thread while creating the HRTF database.
m_hrtfDatabaseLoader = HRTFDatabaseLoader::createAndLoadAsynchronouslyIfNecessary(context.sampleRate());
addInput(std::make_unique<AudioNodeInput>(this));
addOutput(std::make_unique<AudioNodeOutput>(this, 2));
// Node-specific default mixing rules.
m_channelCount = 2;
m_channelCountMode = ClampedMax;
m_channelInterpretation = AudioBus::Speakers;
m_distanceGain = AudioParam::create(context, "distanceGain", 1.0, 0.0, 1.0);
m_coneGain = AudioParam::create(context, "coneGain", 1.0, 0.0, 1.0);
m_position = FloatPoint3D(0, 0, 0);
m_orientation = FloatPoint3D(1, 0, 0);
m_velocity = FloatPoint3D(0, 0, 0);
setNodeType(NodeTypePanner);
initialize();
}
WaveShaperNode::WaveShaperNode(AudioContext& context)
: AudioNode(context)
{
setHandler(AudioBasicProcessorHandler::create(AudioHandler::NodeTypeWaveShaper, *this, context.sampleRate(), adoptPtr(new WaveShaperProcessor(context.sampleRate(), 1))));
handler().initialize();
}