vaapi_decode: support dynamically frame pool resizing. #397
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Two benefits of this patch set:
1. Save memory. If we play an 8k hevc, previous code we allocate 50M * 20(1 + 16 + 3) = 1G memory. 16 is a waste for most playback cases.
2. Allow downstream cache more frames. A downstream lookahead encoder will cache some frames. 20 may not enough for it.
This patch set will fix the following command
ffmpeg -hwaccel vaapi -hwaccel_output_format vaapi -i 100frames.264 -vf reverse -an -f null -