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Initial version of alpha channel support

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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
This commit is contained in:
John Koleszar
2013-05-15 17:55:08 -07:00
parent 16ac5a5cde
commit 679e4abdd5
19 changed files with 214 additions and 52 deletions
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1
vp9/encoder/vp9_encodemb.c
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@@ -44,7 +44,6 @@ static void subtract_plane(MACROBLOCK *x, BLOCK_SIZE_TYPE bsize, int plane) {
const uint8_t *src = x->plane[plane].src.buf;
const int src_stride = x->plane[plane].src.stride;
assert(plane < 3);
vp9_subtract_block(bh, bw,
x->plane[plane].src_diff, bw, src, src_stride,
xd->plane[plane].dst.buf, xd->plane[plane].dst.stride);