Function ovr_GetAudioDeviceOutWaveId

ReviveXR/REV_CAPI_Audio.cpp:89–172

}

OVR_PUBLIC_FUNCTION(ovrResult) ovr_GetAudioDeviceOutWaveId(UINT* deviceOutId)
{
	REV_TRACE(ovr_GetAudioDeviceOutWaveId);

	if (!deviceOutId)
		return ovrError_InvalidParameter;

	// Query and cache the result
	static UINT cachedId = 0;
	if (!cachedId && Runtime::Get().AudioDevice)
	{
		XR_FUNCTION(g_Instance, GetAudioOutputDeviceGuidOculus);

		MMRESULT mmr;
		WCHAR strEndpointIdKey[OVR_AUDIO_MAX_DEVICE_STR_SIZE] = {};
		XrResult result = GetAudioOutputDeviceGuidOculus(g_Instance, strEndpointIdKey);
		if (XR_FAILED(result))
			return ovrError_AudioOutputDeviceNotFound;

		// Get the size of the endpoint ID string.
		size_t cbEndpointIdKey = wcsnlen_s(strEndpointIdKey, OVR_AUDIO_MAX_DEVICE_STR_SIZE) * sizeof(WCHAR);

		// Include terminating null in string size.
		cbEndpointIdKey += sizeof(WCHAR);

		// Each for-loop iteration below compares the endpoint ID
		// string of the audio endpoint device to the endpoint ID
		// string of an enumerated waveOut device. If the strings
		// match, then we've found the waveOut device that is
		// assigned to the specified device role.
		UINT waveOutId;
		UINT cWaveOutDevices = waveOutGetNumDevs();
		WCHAR strEndpointId[OVR_AUDIO_MAX_DEVICE_STR_SIZE] = {};
		for (waveOutId = 0; waveOutId < cWaveOutDevices; waveOutId++)
		{
			size_t cbEndpointId = 0;

			// Get the size (including the terminating null) of
			// the endpoint ID string of the waveOut device.
			mmr = waveOutMessage((HWAVEOUT)UIntToPtr(waveOutId),
				DRV_QUERYFUNCTIONINSTANCEIDSIZE,
				(DWORD_PTR)&cbEndpointId, NULL);
			if (mmr != MMSYSERR_NOERROR ||
				cbEndpointIdKey != cbEndpointId)  // do sizes match?
			{
				continue;  // not a matching device
			}

			// Get the endpoint ID string for this waveOut device.
			mmr = waveOutMessage((HWAVEOUT)UIntToPtr(waveOutId),
				DRV_QUERYFUNCTIONINSTANCEID,
				(DWORD_PTR)strEndpointId,
				cbEndpointId);
			if (mmr != MMSYSERR_NOERROR)
			{
				continue;
			}