• Jingning Han's avatar
    Conditionally skip inverse transform in transform block RD · 1a7f0a8c
    Jingning Han authored
    When the lower bound of a transform block rate-distortion cost is
    above the current best rd cost, the only possibility that this
    particular coding mode will be chosen is to fall back to all skip
    mode. Hence there is no need to estimate the transform block rate
    cost, distortion, etc. Obtain the sum of squared distance between
    the prediction and the source would be sufficient.
    This speeds up the encoding process by 5% - 10%.
    Change-Id: I728728c3a42aafefd34641f0be69b3e2a9b9bbb2