faudio: Return PCM format from IXAudio27_GetDeviceDetails.

dlls/xaudio2_7/tests/xaudio2.c

@@ -940,7 +940,6 @@ static UINT32 test_DeviceDetails(IXAudio27 *xa)
         else
             ok(dd.Role == NotDefaultDevice, "Got wrong role for index %u: 0x%x\n", i, dd.Role);
 
-        todo_wine
         ok(IsEqualGUID(&dd.OutputFormat.SubFormat, &KSDATAFORMAT_SUBTYPE_PCM),
            "got format %s\n", debugstr_guid(&dd.OutputFormat.SubFormat));
     }

libs/faudio/src/FAudio_platform_win32.c

@@ -364,13 +364,14 @@ uint32_t FAudio_PlatformGetDeviceDetails(
 	uint32_t index,
 	FAudioDeviceDetails *details
 ) {
+	WAVEFORMATEX *format, *obtained;
 	WAVEFORMATEXTENSIBLE *ext;
-	WAVEFORMATEX *format;
 	IAudioClient *client;
 	IMMDevice *device;
 	uint32_t ret = 0;
 	HRESULT hr;
 	WCHAR *str;
+	GUID sub;
 
 	FAudio_memset(details, 0, sizeof(FAudioDeviceDetails));
 	if (index > 0) return FAUDIO_E_INVALID_CALL;
@@ -406,6 +407,28 @@ uint32_t FAudio_PlatformGetDeviceDetails(
 	hr = IAudioClient_GetMixFormat(client, &format);
 	FAudio_assert(!FAILED(hr) && "Failed to get audio client mix format!");
 
+	if (format->wFormatTag == WAVE_FORMAT_EXTENSIBLE)
+	{
+		ext = (WAVEFORMATEXTENSIBLE *)format;
+		sub = ext->SubFormat;
+		FAudio_memcpy(
+			&ext->SubFormat,
+			&DATAFORMAT_SUBTYPE_PCM,
+			sizeof(GUID)
+		);
+
+		hr = IAudioClient_IsFormatSupported(client, AUDCLNT_SHAREMODE_SHARED, format, &obtained);
+		if (FAILED(hr))
+		{
+			ext->SubFormat = sub;
+		}
+		else if (obtained)
+		{
+			CoTaskMemFree(format);
+			format = obtained;
+		}
+	}
+
 	details->OutputFormat.Format.wFormatTag = format->wFormatTag;
 	details->OutputFormat.Format.nChannels = format->nChannels;
 	details->OutputFormat.Format.nSamplesPerSec = format->nSamplesPerSec;
@@ -426,6 +449,8 @@ uint32_t FAudio_PlatformGetDeviceDetails(
 		);
 	}
 
+	CoTaskMemFree(format);
+
 	IAudioClient_Release(client);
 
 	IMMDevice_Release(device);