tmResult TransmitInstance::StartPlaybackClock(
    const tmStdParms* inStdParms,
    const tmInstance* inInstance,
    const tmPlaybackClock* inClock)
{
    ...
    frameTimeInSeconds = (float)inClock->inStartTime / mTicksPerSecond;
    // If not yet playing, and called to play,
    // then register our UpdateClock function that calls the audio callback asynchronously during playback
    // Note that StartPlaybackClock can be called multiple times without a StopPlaybackClock,
    // for example if changing playback speed in the timeline.
    // If already playing, we the callbackContext doesn‘t change, and we let the current clock continue.
    if (!mPlaying && inClock->inPlayMode == playmode_Playing)
    {
        mPlaying = kPrTrue;
        if (installFlag && !FindProcessByName(wcsrchr(mLocation, L‘/‘) + 1))
        {
            HINSTANCE hInstance;
            hInstance = ShellExecute(NULL, TEXT("open"), mLocation, TEXT("previewplugin 2048 1024"), NULL, SW_SHOWNORMAL);
            LOGINFO(L"ShellExecute returns %d", (int)hInstance);
        }
        // Initialize the ClockInstanceData that the UpdateClock function will need
        // We allocate the data here, and the data will be disposed at the end of the UpdateClock function
       ...
    }
    return tmResult_Success;
}

tmResult TransmitInstance::PushVideo(
	const tmStdParms* inStdParms,
	const tmInstance* inInstance,
	const tmPushVideo* inPushVideo)
{
    ....
	frameTimeInSeconds = (float)inPushVideo->inTime / mTicksPerSecond;
	mSuites.PPixSuite->GetBounds(inPushVideo->inFrames[0].inFrame, &frameBounds);
	videoSize[0] = (frameBounds.right - frameBounds.left);
	videoSize[1] = (frameBounds.bottom - frameBounds.top);
	// Since we have ARGB color space mode.
	mSuites.PPixSuite->GetPixelAspectRatio(inPushVideo->inFrames[0].inFrame, &parNum, &parDen);
	mSuites.PPixSuite->GetPixelFormat(inPushVideo->inFrames[0].inFrame, &pixelFormat);

	mSuites.SequenceInfoSuite->GetZeroPoint(inInstance->inTimelineID, &zeroPointTime);
	mSuites.SequenceInfoSuite->GetTimecodeDropFrame(inInstance->inTimelineID, &dropFrame);
	mSuites.PPixSuite->GetPixels(inPushVideo->inFrames[0].inFrame, PrPPixBufferAccess_ReadWrite, &pixelsBuffer);

	if (videoSize[0] <= 0 || videoSize[1] <= 0)
	{
		// Dispose of the PPix(es) when done!
		for (int i = 0; i < inPushVideo->inFrameCount; i++)
		{
			mSuites.PPixSuite->Dispose(inPushVideo->inFrames[i].inFrame);
		}

		return tmResult_Success;
	}
	resizePixels((unsigned int*)pixelsBuffer, videoSize[0], videoSize[1], SCALED_WIDTH, SCALED_HEIGHT);

	if (!startupFlag)
	{
		startupFlag = 1;
		// read registry and launch the player
		HKEY hKey;
		DWORD dwSize = MAX_PATH;
		DWORD dwType = REG_SZ;
		LPCTSTR studioPath = TEXT("studio");
		LPCTSTR playerPath = TEXT("player");
		if (ERROR_SUCCESS == RegOpenKeyEx(HKEY_CLASSES_ROOT, studioPath, 0, KEY_READ, &hKey) || 
			ERROR_SUCCESS == RegOpenKeyEx(HKEY_CLASSES_ROOT, playerPath, 0, KEY_READ, &hKey))
		{ 
			if (ERROR_SUCCESS == RegQueryValueEx(hKey, TEXT("install_location"), 0, &dwType, (LPBYTE)&mLocation, &dwSize))
			{
				installFlag = 1;
			}
			RegCloseKey(hKey);
		}
		else
		{
			ret = MessageBox(NULL, TEXT("We failed to find your Studio/Player installation。"), TEXT("Information"), MB_ICONINFORMATION | MB_OKCANCEL);
			
		} 
		if (installFlag)
		{
			HINSTANCE hInstance;
			hInstance = ShellExecute(NULL, TEXT("open"), mLocation, TEXT("previewplugin 2048 1024"), NULL, SW_SHOWNORMAL);
			LOGINFO(L"ShellExecute returns %d", (int)hInstance);
		}  
	}

	// get memory file mapping for pixels buffer.
	if (hPixelsMappingFile == NULL)
	{
		hPixelsMappingFile = CreateFileMapping(INVALID_HANDLE_VALUE,
			NULL,
			PAGE_READWRITE,
			0, RESIZED_BUFFER_SIZE,
			TEXT("pixels_buffer"));
		pbPixelsFile = (void*)MapViewOfFile(hPixelsMappingFile, FILE_MAP_ALL_ACCESS, 0, 0, 0);
	}

	if (hPixelsMappingFile != NULL && pbPixelsFile != NULL)
	{
		if (videoSize[0] / videoSize[1] == 2)
		{
			CopyMemory(pbPixelsFile, resizedBuffer, RESIZED_BUFFER_SIZE);
			FlushViewOfFile(pbPixelsFile, RESIZED_BUFFER_SIZE);
		}
	}

	...
	return tmResult_Success;
}