MMRESULT
AllocateSoundDeviceInstance(
OUT PSOUND_DEVICE_INSTANCE* SoundDeviceInstance)
{
PSOUND_DEVICE_INSTANCE NewInstance;
VALIDATE_MMSYS_PARAMETER( SoundDeviceInstance );
/* Allocate memory for the new instance */
NewInstance = AllocateStruct(SOUND_DEVICE_INSTANCE);
if ( ! NewInstance )
return MMSYSERR_NOMEM;
/* Use default frame size */
NewInstance->FrameSize = SOUND_KERNEL_BUFFER_SIZE;
/* Use default buffer count */
NewInstance->BufferCount = SOUND_KERNEL_BUFFER_COUNT;
/* Provide the caller with the new instance pointer */
*SoundDeviceInstance = NewInstance;
return MMSYSERR_NOERROR;
}
MMRESULT
CreateSoundThread(
OUT PSOUND_THREAD* Thread)
{
MMRESULT Result;
PSOUND_THREAD NewThread;
VALIDATE_MMSYS_PARAMETER( Thread );
NewThread = AllocateStruct(SOUND_THREAD);
if ( ! NewThread )
return MMSYSERR_NOMEM;
/* Prepare the events we'll be using to sync. everything */
Result = CreateSoundThreadEvents(&NewThread->Events.Ready,
&NewThread->Events.Request,
&NewThread->Events.Done);
if ( ! MMSUCCESS(Result) )
{
FreeMemory(NewThread);
return TranslateInternalMmResult(Result);
}
SND_TRACE(L"Creating a sound thread\n");
NewThread->Handle = CreateThread(NULL,
0,
&SoundThreadMain,
(LPVOID) NewThread,
CREATE_SUSPENDED,
NULL);
/* Something went wrong, bail out! */
if ( NewThread->Handle == INVALID_HANDLE_VALUE )
{
SND_ERR(L"Sound thread creation failed!\n");
DestroySoundThreadEvents(NewThread->Events.Ready,
NewThread->Events.Request,
NewThread->Events.Done);
FreeMemory(NewThread);
return Win32ErrorToMmResult(GetLastError());
}
/* Wake the thread up */
if ( ResumeThread(NewThread->Handle) == -1 )
{
SND_ERR(L"Failed to resume thread!\n");
CloseHandle(NewThread->Handle);
DestroySoundThreadEvents(NewThread->Events.Ready,
NewThread->Events.Request,
NewThread->Events.Done);
FreeMemory(NewThread);
return Win32ErrorToMmResult(GetLastError());
}
/* If all is well we can now give the thread to the caller */
*Thread = NewThread;
return MMSYSERR_NOERROR;
}