void FFmpegInteropMSS::OnStarting()

in FFmpegInterop/Source/FFmpegInteropMSS.cpp [695:736]

• 30 lines of code
• 9 McCabe index (conditional complexity)

void FFmpegInteropMSS::OnStarting(MediaStreamSource ^sender, MediaStreamSourceStartingEventArgs ^args)
{
	MediaStreamSourceStartingRequest^ request = args->Request;

	// Perform seek operation when MediaStreamSource received seek event from MediaElement
	if (request->StartPosition && request->StartPosition->Value.Duration <= mediaDuration.Duration)
	{
		// Select the first valid stream either from video or audio
		int streamIndex = videoStreamIndex >= 0 ? videoStreamIndex : audioStreamIndex >= 0 ? audioStreamIndex : -1;

		if (streamIndex >= 0)
		{
			// Convert TimeSpan unit to AV_TIME_BASE
			int64_t seekTarget = static_cast<int64_t>(request->StartPosition->Value.Duration / (av_q2d(avFormatCtx->streams[streamIndex]->time_base) * 10000000));

			if (av_seek_frame(avFormatCtx, streamIndex, seekTarget, AVSEEK_FLAG_BACKWARD) < 0)
			{
				DebugMessage(L" - ### Error while seeking\n");
			}
			else
			{
				// Add deferral

				// Flush the AudioSampleProvider
				if (audioSampleProvider != nullptr)
				{
					audioSampleProvider->Flush();
					avcodec_flush_buffers(avAudioCodecCtx);
				}

				// Flush the VideoSampleProvider
				if (videoSampleProvider != nullptr)
				{
					videoSampleProvider->Flush();
					avcodec_flush_buffers(avVideoCodecCtx);
				}
			}
		}

		request->SetActualStartPosition(request->StartPosition->Value);
	}
}