[AUDIO] Implement retreiving audio playback position

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

dll/win32/wdmaud.drv/legacy.c

@@ -832,7 +832,7 @@ WdmAudGetWavePositionByLegacy(
     DeviceInfo.DeviceType = DeviceType;
 
     Result = SyncOverlappedDeviceIoControl(KernelHandle,
-                                           IOCTL_OPEN_WDMAUD,
+                                           IOCTL_GETPOS,
                                            (LPVOID) &DeviceInfo,
                                            sizeof(WDMAUD_DEVICE_INFO),
                                            (LPVOID) &DeviceInfo,

dll/win32/wdmaud.drv/mmixer.c

@@ -776,7 +776,35 @@ WdmAudGetWavePositionByMMixer(
     IN  struct _SOUND_DEVICE_INSTANCE* SoundDeviceInstance,
     IN  MMTIME* Time)
 {
-    /* FIXME */
+    PSOUND_DEVICE SoundDevice;
+    MMDEVICE_TYPE DeviceType;
+    MIXER_STATUS Status;
+    MMRESULT Result;
+    DWORD Position;
+
+    Result = GetSoundDeviceFromInstance(SoundDeviceInstance, &SoundDevice);
+
+    if ( ! MMSUCCESS(Result) )
+    {
+        return TranslateInternalMmResult(Result);
+    }
+
+    Result = GetSoundDeviceType(SoundDevice, &DeviceType);
+    SND_ASSERT( Result == MMSYSERR_NOERROR );
+
+    if (DeviceType == WAVE_IN_DEVICE_TYPE || DeviceType == WAVE_OUT_DEVICE_TYPE)
+    {
+        Status = MMixerGetWavePosition(&MixerContext, SoundDeviceInstance->Handle, &Position);
+        if (Status == MM_STATUS_SUCCESS)
+        {
+            /* Store position */
+            Time->wType = TIME_BYTES;
+            Time->u.cb = Position;
+
+            /* Completed successfully */
+            return MMSYSERR_NOERROR;
+        }
+    }
     return MMSYSERR_NOTSUPPORTED;
 }
 

drivers/wdm/audio/legacy/wdmaud/control.c

@@ -366,6 +366,7 @@ WdmAudDeviceControl(
         case IOCTL_RESET_STREAM:
             return WdmAudResetStream(DeviceObject, Irp, DeviceInfo);
         case IOCTL_GETPOS:
+            return WdmAudGetPosition(DeviceObject, Irp, DeviceInfo);
         case IOCTL_GETDEVID:
         case IOCTL_GETVOLUME:
         case IOCTL_SETVOLUME:

drivers/wdm/audio/legacy/wdmaud/mmixer.c

@@ -769,6 +769,27 @@ WdmAudMidiCapabilities(
         return STATUS_UNSUCCESSFUL;
 }
 
+NTSTATUS
+NTAPI
+WdmAudGetPosition(
+    IN  PDEVICE_OBJECT DeviceObject,
+    IN  PIRP Irp,
+    IN  PWDMAUD_DEVICE_INFO DeviceInfo)
+{
+    MIXER_STATUS Status;
+    DWORD Position;
+
+    /* get position */
+    Status = MMixerGetWavePosition(&MixerContext, DeviceInfo->hDevice, &Position);
+
+    DeviceInfo->u.Position = (ULONGLONG)Position;
+
+    if (Status == MM_STATUS_SUCCESS)
+        return SetIrpIoStatus(Irp, STATUS_SUCCESS, sizeof(WDMAUD_DEVICE_INFO));
+    else
+        return SetIrpIoStatus(Irp, STATUS_UNSUCCESSFUL, sizeof(WDMAUD_DEVICE_INFO));
+}
+
 
 MIXER_STATUS
 CreatePinCallback(

drivers/wdm/audio/legacy/wdmaud/wdmaud.h

@@ -198,6 +198,13 @@ WdmAudMidiCapabilities(
     IN PWDMAUD_CLIENT ClientInfo,
     IN PWDMAUD_DEVICE_EXTENSION DeviceExtension);
 
+NTSTATUS
+NTAPI
+WdmAudGetPosition(
+    IN  PDEVICE_OBJECT DeviceObject,
+    IN  PIRP Irp,
+    IN  PWDMAUD_DEVICE_INFO DeviceInfo);
+
 NTSTATUS
 NTAPI
 WdmAudFrameSize(

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 DWORD * Position);
+
 MIXER_STATUS
 MMixerSetWaveStatus(
     IN PMIXER_CONTEXT MixerContext,

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

@@ -614,6 +614,46 @@ MMixerGetWaveOutCount(
     return MixerList->WaveOutListCount;
 }
 
+MIXER_STATUS
+MMixerGetWavePosition(
+    IN PMIXER_CONTEXT MixerContext,
+    IN HANDLE PinHandle,
+    OUT DWORD * Position)
+{
+    KSAUDIO_POSITION AudioPosition;
+    KSPROPERTY Property;
+    MIXER_STATUS Status;
+    ULONG Length;
+
+    /* verify mixer context */
+    Status = MMixerVerifyContext(MixerContext);
+
+    if (Status != MM_STATUS_SUCCESS)
+    {
+        /* invalid context passed */
+        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(KSPROPERTY), &AudioPosition, sizeof(KSAUDIO_POSITION), &Length);
+
+    if (Status == MM_STATUS_SUCCESS)
+    {
+        /* store audio position */
+        *Position = (DWORD)AudioPosition.PlayOffset;
+    }
+    else
+    {
+        /* failed */
+        *Position = 0;
+    }
+
+    return Status;
+}
+
 MIXER_STATUS
 MMixerSetWaveStatus(
     IN PMIXER_CONTEXT MixerContext,