[AUDIO] Implement retreiving audio playback position (#6817)

Implement GetWavePosition API for both Legacy and MMixer modes.
[WDMAUD.DRV]
- Fix wrong I/O control code passed to DeviceIoControl for Legacy mode. Use IOCTL_GETPOS instead of IOCTL_OPEN_WDMAUD, to use the correct routine.
- Implement WdmAudGetWavePosition for MMixer mode, as it was completely unimplemented there. Call an appropiate MMixer routine and return back resulting wave position.
[WDMAUD]
- Implement WdmAudGetPostion routine, which is used by Legacy mode, and call the same MMixer routine from it too.
- Handle it in IOCTL_GETPOS I/O control request of dispatch routine.
[MMIXER]
- Implement MMixerGetWavePosition internal routine, which is called by both Legacy and MMixer modes, and does the actual work of retrieving playback position.
- Call an apporpriate KSPROPERTY_AUDIO_POSITION property from it, and return in the output resulting KSAUDIO_POSITION.PlayOffset member, which contains the current playback position offset, to be returned to the caller.
This fixes a failure retreiving the current audio playback position snd subsequent playing the audio data by several 3rd-party applications which are using this API (for example, some Gecko based browsers by @roytam1: Basilisk (Serpent) 52.9.0 IA-32 build, NewMoon 28.10.7 IA-32 build and KMeleon 76.5.3 Goanna engine).
CORE-19542

sdk/lib/drivers/sound/mmixer/mmixer.h

@@ -207,6 +207,12 @@ MMixerOpenWave(
     IN PVOID Context,
     OUT PHANDLE PinHandle);
 
+MIXER_STATUS
+MMixerGetWavePosition(
+    _In_ PMIXER_CONTEXT MixerContext,
+    _In_ HANDLE PinHandle,
+    _Out_ PDWORD Position);
+
 MIXER_STATUS
 MMixerSetWaveStatus(
     IN PMIXER_CONTEXT MixerContext,

sdk/lib/drivers/sound/mmixer/wave.c

@@ -614,6 +614,40 @@ MMixerGetWaveOutCount(
     return MixerList->WaveOutListCount;
 }
 
+MIXER_STATUS
+MMixerGetWavePosition(
+    _In_ PMIXER_CONTEXT MixerContext,
+    _In_ HANDLE PinHandle,
+    _Out_ PDWORD Position)
+{
+    KSAUDIO_POSITION AudioPosition;
+    KSPROPERTY Property;
+    MIXER_STATUS Status;
+    ULONG Length;
+
+    /* Validate mixer context */
+    Status = MMixerVerifyContext(MixerContext);
+
+    if (Status != MM_STATUS_SUCCESS)
+        return Status;
+
+    Property.Id = KSPROPERTY_AUDIO_POSITION;
+    Property.Set = KSPROPSETID_Audio;
+    Property.Flags = KSPROPERTY_TYPE_GET;
+
+    Status = MixerContext->Control(PinHandle, IOCTL_KS_PROPERTY,
+                                   &Property, sizeof(Property),
+                                   &AudioPosition, sizeof(AudioPosition),
+                                   &Length);
+    if (Status == MM_STATUS_SUCCESS)
+    {
+        /* store audio position */
+        *Position = (DWORD)AudioPosition.PlayOffset;
+    }
+
+    return Status;
+}
+
 MIXER_STATUS
 MMixerSetWaveStatus(
     IN PMIXER_CONTEXT MixerContext,