bool CAHALAudioObject::IsPropertySettable(AudioObjectPropertyAddress& inAddress) const
{
Boolean isSettable = false;
OSStatus theError = AudioObjectIsPropertySettable(mObjectID, &inAddress, &isSettable);
ThrowIfError(theError, CAException(theError), "CAHALAudioObject::IsPropertySettable: got an error getting info about a property");
return isSettable != 0;
}
static Boolean IsAudioPropertySettable(AudioObjectID id,
AudioObjectPropertySelector selector,
Boolean *outData)
{
AudioObjectPropertyAddress property_address;
property_address.mSelector = selector;
property_address.mScope = kAudioObjectPropertyScopeGlobal;
property_address.mElement = kAudioObjectPropertyElementMaster;
return AudioObjectIsPropertySettable(id, &property_address, outData);
}
Boolean AudioOutputHasVolumeControl(AudioDeviceID device, Boolean *isWritable) {
OSStatus err = AudioObjectIsPropertySettable(device, &kAudioOutputVolumeProperty, isWritable);
if (noErr == err) {
return TRUE;
} else {
UInt32 channel;
err = AudioOutputGetStereoChannels(device, &channel, NULL);
if (noErr == err) {
return noErr == AudioDeviceGetPropertyInfo(device, channel, FALSE, kAudioDevicePropertyVolumeScalar, NULL, isWritable);
}
}
return FALSE;
}
static inline gboolean
_audio_device_set_mixing (AudioDeviceID device_id, gboolean enable_mix)
{
OSStatus status = noErr;
UInt32 propertySize = 0, can_mix = enable_mix;
Boolean writable = FALSE;
gboolean res = FALSE;
AudioObjectPropertyAddress audioDeviceSupportsMixingAddress = {
kAudioDevicePropertySupportsMixing,
kAudioObjectPropertyScopeGlobal,
kAudioObjectPropertyElementMaster
};
if (AudioObjectHasProperty (device_id, &audioDeviceSupportsMixingAddress)) {
/* Set mixable to false if we are allowed to */
status = AudioObjectIsPropertySettable (device_id,
&audioDeviceSupportsMixingAddress, &writable);
if (status) {
GST_DEBUG ("AudioObjectIsPropertySettable: %d", (int) status);
}
status = AudioObjectGetPropertyDataSize (device_id,
&audioDeviceSupportsMixingAddress, 0, NULL, &propertySize);
if (status) {
GST_DEBUG ("AudioObjectGetPropertyDataSize: %d", (int) status);
}
status = AudioObjectGetPropertyData (device_id,
&audioDeviceSupportsMixingAddress, 0, NULL, &propertySize, &can_mix);
if (status) {
GST_DEBUG ("AudioObjectGetPropertyData: %d", (int) status);
}
if (status == noErr && writable) {
can_mix = enable_mix;
status = AudioObjectSetPropertyData (device_id,
&audioDeviceSupportsMixingAddress, 0, NULL, propertySize, &can_mix);
res = TRUE;
}
if (status != noErr) {
GST_ERROR ("failed to set mixmode: %d", (int) status);
}
} else {
GST_DEBUG ("property not found, mixing coudln't be changed");
}
return res;
}
static BOOL DeviceHasMute(AudioDeviceID deviceID, Boolean isInput)
{
Boolean writable = false;
OSStatus err = noErr;
AudioObjectPropertyAddress propertyAddress;
propertyAddress.mSelector = kAudioDevicePropertyMute;
propertyAddress.mScope = isInput ? kAudioDevicePropertyScopeInput : kAudioDevicePropertyScopeOutput;
propertyAddress.mElement = 0;
if (AudioObjectHasProperty(deviceID, &propertyAddress))
{
/* check if we can set it */
err = AudioObjectIsPropertySettable(deviceID, &propertyAddress, &writable);
if (err == noErr)
return writable;
}
return FALSE;
}
bool CCoreAudioDevice::GetMixingSupport()
{
if (!m_DeviceId)
return false;
UInt32 size;
UInt32 mix = 0;
Boolean writable = false;
AudioObjectPropertyAddress propertyAddress;
propertyAddress.mScope = kAudioDevicePropertyScopeOutput;
propertyAddress.mElement = 0;
propertyAddress.mSelector = kAudioDevicePropertySupportsMixing;
if( AudioObjectHasProperty( m_DeviceId, &propertyAddress ) )
{
OSStatus ret = AudioObjectIsPropertySettable(m_DeviceId, &propertyAddress, &writable);
if (ret)
{
CLog::Log(LOGERROR, "CCoreAudioDevice::SupportsMixing: "
"Unable to get propertyinfo mixing support. Error = %s", GetError(ret).c_str());
writable = false;
}
if (writable)
{
size = sizeof(mix);
ret = AudioObjectGetPropertyData(m_DeviceId, &propertyAddress, 0, NULL, &size, &mix);
if (ret != noErr)
mix = 0;
}
}
CLog::Log(LOGDEBUG, "CCoreAudioDevice::SupportsMixing: "
"Device mixing support : %s.", mix ? "'Yes'" : "'No'");
return (mix > 0);
}
bool CAHALAudioObject::ObjectExists(AudioObjectID inObjectID)
{
Boolean isSettable;
CAPropertyAddress theAddress(kAudioObjectPropertyClass);
return (inObjectID == 0) || (AudioObjectIsPropertySettable(inObjectID, &theAddress, &isSettable) != 0);
}