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  • John Koleszar's avatar
    Initial version of alpha channel support · 679e4abd
    John Koleszar authored
    This is a mostly-working implementation of an extra channel in the
    bitstream. Configure with --enable-alpha to test. Notable TODOs:
     - Add extra channel to all mismatch tests, PSNR, SSIM, etc
     - Configurable subsampling
     - Variable number of planes (currently always uses all 4)
     - Loop filtering
     - Per-plane lossless quantizer
     - ARNR support
    This implementation just uses the same contents as the Y channel
    for the A channel, due to lack of content and general pain in
    playing back 4 channel content. A later patch will use the actual
    alpha channel passed in from outside the codec.
    Change-Id: Ibf81f023b1c570bd84b3064e9b4b8ae52e087592