Implementation of MockVideoMediaSource and PassthroughDecoder #122
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Adding two new classes that will let us do some powerful media transformations:
MockVideoMediaSourceis an implementation ofMediaSourcethat acts as a source with a single video track of a certain duration. Client defines properties of this track by passing in aMediaFormatwith necessary metadata values.PassthroughDecoderis an implementation ofDecoderwhich simply outputs input frames in the order it received them. If running in hardware accelerated mode, it also triggers a GL draw call when output frame is released with a request to render a frame.We use these two new classes in a new demo case to create a 5 second "empty" video. Optionally we can use a still background image, turning that into a video.