C++ (Cpp) createAudioStreams Examples

Example #1

File: eqMac2DriverEngine.cpp Project: Laurinus/eqMac2

bool eqMac2DriverEngine::initHardware(IOService *provider)
{
    bool result = false;
    IOAudioSampleRate initialSampleRate;
    IOWorkLoop *wl;
    
    //IOLog("eqMac2DriverEngine[%p]::initHardware(%p)\n", this, provider);
    
    duringHardwareInit = TRUE;
    
    if (!super::initHardware(provider)) {
        goto Done;
    }
    
    initialSampleRate.whole = 0;
    initialSampleRate.fraction = 0;

    if (!createAudioStreams(&initialSampleRate)) {
		IOLog("eqMac2DriverEngine::initHardware() failed\n");
        goto Done;
    }
	
    if (initialSampleRate.whole == 0) {
        goto Done;
    }
    
    // calculate our timeout in nanosecs, taking care to keep 64bits
    blockTimeoutNS = blockSize;
    blockTimeoutNS *= 1000000000;
    blockTimeoutNS /= initialSampleRate.whole;

	setSampleRate(&initialSampleRate);
    
    // Set the number of sample frames in each buffer
    setNumSampleFramesPerBuffer(blockSize * numBlocks);
    
    wl = getWorkLoop();
    if (!wl) {
        goto Done;
    }
    
    timerEventSource = IOTimerEventSource::timerEventSource(this, ourTimerFired);
    
    if (!timerEventSource) {
        goto Done;
    }
    
    workLoop->addEventSource(timerEventSource);
        
    result = true;
    
Done:
    duringHardwareInit = FALSE;    
    return result;
}

Example #2

File: PhantomAudioEngine.cpp Project: arnelh/Examples

bool PhantomAudioEngine::initHardware(IOService *provider)
{
    bool result = false;
    IOAudioSampleRate initialSampleRate;
    IOWorkLoop *wl;
    
    IOLog("PhantomAudioEngine[%p]::initHardware(%p)\n", this, provider);
    
    duringHardwareInit = TRUE;
    
    if (!super::initHardware(provider)) {
        goto Done;
    }
    
    initialSampleRate.whole = 0;
    initialSampleRate.fraction = 0;

    if (!createAudioStreams(&initialSampleRate)) {
        goto Done;
    }
    
    if (initialSampleRate.whole == 0) {
        goto Done;
    }
    
    blockTimeoutUS = 1000000 * blockSize / initialSampleRate.whole;
    
    setSampleRate(&initialSampleRate);
    
    // Set the number of sample frames in each buffer
    setNumSampleFramesPerBuffer(blockSize * numBlocks);
    
    wl = getWorkLoop();
    if (!wl) {
        goto Done;
    }
    
    timerEventSource = IOTimerEventSource::timerEventSource(this, timerFired);
    
    if (!timerEventSource) {
        goto Done;
    }
    
    workLoop->addEventSource(timerEventSource);
        
    result = true;
    
Done:

    duringHardwareInit = FALSE;
    
    return result;
}