HRESULT FFmpegInteropMSS::CreateMediaStreamSource()

in FFmpegInterop/Source/FFmpegInteropMSS.cpp [151:203]

43 lines of code
9 McCabe index (conditional complexity)


HRESULT FFmpegInteropMSS::CreateMediaStreamSource(String^ uri, bool forceAudioDecode, bool forceVideoDecode, PropertySet^ ffmpegOptions)
{
	HRESULT hr = S_OK;
	const char* charStr = nullptr;
	if (!uri)
	{
		hr = E_INVALIDARG;
	}

	if (SUCCEEDED(hr))
	{
		avFormatCtx = avformat_alloc_context();
		if (avFormatCtx == nullptr)
		{
			hr = E_OUTOFMEMORY;
		}
	}

	if (SUCCEEDED(hr))
	{
		// Populate AVDictionary avDict based on PropertySet ffmpegOptions. List of options can be found in https://www.ffmpeg.org/ffmpeg-protocols.html
		hr = ParseOptions(ffmpegOptions);
	}

	if (SUCCEEDED(hr))
	{
		std::wstring uriW(uri->Begin());
		std::string uriA(uriW.begin(), uriW.end());
		charStr = uriA.c_str();

		// Open media in the given URI using the specified options
		if (avformat_open_input(&avFormatCtx, charStr, NULL, &avDict) < 0)
		{
			hr = E_FAIL; // Error opening file
		}

		// avDict is not NULL only when there is an issue with the given ffmpegOptions such as invalid key, value type etc. Iterate through it to see which one is causing the issue.
		if (avDict != nullptr)
		{
			DebugMessage(L"Invalid FFmpeg option(s)");
			av_dict_free(&avDict);
			avDict = nullptr;
		}
	}

	if (SUCCEEDED(hr))
	{
		this->mss = nullptr;
		hr = InitFFmpegContext(forceAudioDecode, forceVideoDecode);
	}

	return hr;
}