bool CCoreAudioDevice::SetNominalSampleRate(Float64 sampleRate)
{
if (!m_DeviceId || sampleRate == 0.0f)
return false;
Float64 currentRate = GetNominalSampleRate();
if (currentRate == sampleRate)
return true; //No need to change
AudioObjectPropertyAddress propertyAddress;
propertyAddress.mScope = kAudioDevicePropertyScopeOutput;
propertyAddress.mElement = 0;
propertyAddress.mSelector = kAudioDevicePropertyNominalSampleRate;
OSStatus ret = AudioObjectSetPropertyData(m_DeviceId, &propertyAddress, 0, NULL, sizeof(Float64), &sampleRate);
if (ret != noErr)
{
CLog::Log(LOGERROR, "CCoreAudioDevice::SetNominalSampleRate: "
"Unable to set current device sample rate to %0.0f. Error = %s",
(float)sampleRate, GetError(ret).c_str());
return false;
}
if (m_SampleRateRestore == 0.0f)
m_SampleRateRestore = currentRate;
return true;
}
Float64 CAHALAudioDevice::GetActualSampleRate() const
{
Float64 theAnswer = 0;
CAPropertyAddress theAddress(kAudioDevicePropertyActualSampleRate);
if(HasProperty(theAddress))
{
UInt32 theSize = sizeof(Float64);
GetPropertyData(theAddress, 0, NULL, theSize, &theAnswer);
}
else
{
theAnswer = GetNominalSampleRate();
}
return theAnswer;
}
bool CCoreAudioDevice::SetNominalSampleRate(Float64 sampleRate)
{
if (!m_DeviceId || sampleRate == 0.0f)
return false;
Float64 currentRate = GetNominalSampleRate();
if (currentRate == sampleRate)
return true; //No need to change
UInt32 size = sizeof(Float64);
OSStatus ret = AudioDeviceSetProperty(m_DeviceId, NULL, 0, false, kAudioDevicePropertyNominalSampleRate, size, &sampleRate);
if (ret)
{
CLog::Log(LOGERROR, "CCoreAudioUnit::SetNominalSampleRate: Unable to set current device sample rate to %0.0f. Error = 0x%08x (%4.4s)", (float)sampleRate, ret, CONVERT_OSSTATUS(ret));
return false;
}
CLog::Log(LOGDEBUG, "CCoreAudioUnit::SetNominalSampleRate: Changed device sample rate from %0.0f to %0.0f.", (float)currentRate, (float)sampleRate);
if (m_SampleRateRestore == 0.0f)
m_SampleRateRestore = currentRate;
return true;
}
