v8::Handle<v8::Value> Open(const v8::Arguments& args) {
v8::HandleScope scope;
PaError err;
PaStreamParameters outputParameters;
v8::Local<v8::Object> v8Buffer;
v8::Local<v8::Object> v8Stream;
PortAudioData* data;
int sampleRate;
char str[1000];
v8::Handle<v8::Value> initArgs[1];
v8::Handle<v8::Value> toEventEmitterArgs[1];
v8::Local<v8::Value> v8Val;
v8::Handle<v8::Value> argv[2];
argv[0] = v8::Undefined();
argv[1] = v8::Undefined();
// options
if(!args[0]->IsObject()) {
return scope.Close(v8::ThrowException(v8::Exception::TypeError(v8::String::New("First argument must be an object"))));
}
v8::Local<v8::Object> options = args[0]->ToObject();
// callback
if(!args[1]->IsFunction()) {
return scope.Close(v8::ThrowException(v8::Exception::TypeError(v8::String::New("Second argument must be a function"))));
}
v8::Local<v8::Value> callback = args[1];
err = EnsureInitialized();
if(err != paNoError) {
sprintf(str, "Could not initialize PortAudio %d", err);
argv[0] = v8::Exception::TypeError(v8::String::New(str));
goto openDone;
}
if(!g_portAudioStreamInitialized) {
v8::Local<v8::FunctionTemplate> t = v8::FunctionTemplate::New();
t->InstanceTemplate()->SetInternalFieldCount(1);
t->SetClassName(v8::String::NewSymbol("PortAudioStream"));
g_streamConstructor = v8::Persistent<v8::Function>::New(t->GetFunction());
toEventEmitterArgs[0] = g_streamConstructor;
v8Val = options->Get(v8::String::New("toEventEmitter"));
v8::Function::Cast(*v8Val)->Call(options, 1, toEventEmitterArgs);
g_portAudioStreamInitialized = true;
}
memset(&outputParameters, 0, sizeof(PaStreamParameters));
outputParameters.device = Pa_GetDefaultOutputDevice();
if (outputParameters.device == paNoDevice) {
sprintf(str, "No default output device");
argv[0] = v8::Exception::TypeError(v8::String::New(str));
goto openDone;
}
v8Val = options->Get(v8::String::New("channelCount"));
outputParameters.channelCount = v8Val->ToInt32()->Value();
v8Val = options->Get(v8::String::New("sampleFormat"));
switch(v8Val->ToInt32()->Value()) {
case 8:
outputParameters.sampleFormat = paInt8;
break;
case 16:
outputParameters.sampleFormat = paInt16;
break;
case 24:
outputParameters.sampleFormat = paInt24;
break;
case 32:
outputParameters.sampleFormat = paInt32;
break;
default:
argv[0] = v8::Exception::TypeError(v8::String::New("Invalid sampleFormat"));
goto openDone;
}
outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
outputParameters.hostApiSpecificStreamInfo = NULL;
v8Val = options->Get(v8::String::New("sampleRate"));
sampleRate = v8Val->ToInt32()->Value();
data = new PortAudioData();
data->readIdx = 0;
data->writeIdx = 1;
data->channelCount = outputParameters.channelCount;
data->sampleFormat = outputParameters.sampleFormat;
v8Stream = g_streamConstructor->NewInstance();
v8Stream->SetPointerInInternalField(0, data);
v8Val = options->Get(v8::String::New("streamInit"));
initArgs[0] = v8Stream;
v8::Function::Cast(*v8Val)->Call(v8Stream, 1, initArgs);
data->v8Stream = v8::Persistent<v8::Object>::New(v8Stream);
data->v8Stream.MakeWeak(data, CleanupStreamData);
data->v8Stream.MarkIndependent();
v8Buffer = v8Stream->Get(v8::String::New("buffer"))->ToObject();
data->buffer = (unsigned char*)node::Buffer::Data(v8Buffer);
data->bufferLen = node::Buffer::Length(v8Buffer);
err = Pa_OpenStream(
&data->stream,
NULL, // no input
&outputParameters,
sampleRate,
FRAMES_PER_BUFFER,
paClipOff, // we won't output out of range samples so don't bother clipping them
nodePortAudioCallback,
data);
if(err != paNoError) {
sprintf(str, "Could not open stream %d", err);
argv[0] = v8::Exception::TypeError(v8::String::New(str));
goto openDone;
}
v8Stream->Set(v8::String::New("write"), v8::FunctionTemplate::New(stream_write)->GetFunction());
v8Stream->Set(v8::String::New("writeByte"), v8::FunctionTemplate::New(stream_writeByte)->GetFunction());
v8Stream->Set(v8::String::New("start"), v8::FunctionTemplate::New(stream_start)->GetFunction());
v8Stream->Set(v8::String::New("stop"), v8::FunctionTemplate::New(stream_stop)->GetFunction());
argv[1] = v8Stream;
openDone:
v8::Function::Cast(*callback)->Call(v8::Context::GetCurrent()->Global(), 2, argv);
return scope.Close(v8::Undefined());
}
v8::Local<v8::Object> create_instance(void *wrapper) {
v8::Local<v8::Object> instance = js_template->NewInstance();
instance->SetInternalField(0, v8::External::New(wrapper));
return instance;
}
