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d3d11videosink: Avoid switching conversion tool during playback

Seungha Yang requested to merge seungha.yang/gst-plugins-bad:d3d11-converter-switching into master

Decoder might be able to copy decoded texture to the other buffer pool during playback depending on context. In that case, copied one has no D3D11_BIND_DECODER bind flag.

If we used ID3D11VideoProcessor previously for decoder texture, and incoming texture supports ID3D11VideoProcessor as well even if it has no D3D11_BIND_DECODER flag (having D3D11_BIND_RENDER_TARGET for example), allow zero-copying instead of using our fallback texture.

Frequent conversion tool change (between ID3D11VideoProcessor and generic shader) might result in inconsistent image quality.

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