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Optimized unscaled yuvp9/yuvp10 -> yuvp16 conversion.

About 30% faster on 32 bit Atom, 120% faster on 64 bit Phenom2.
This is interesting because supporting P16 is easier in e.g.
OpenGL (can misuse support for any 2-component 8 bit format),
whereas supporting p9/p10 without conversion needs a texture
format with at least 14 bits actual precision.
The shiftonly == 0 case is not optimized since the code is more
complex and the speed gain less obvious.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
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commit 118bd609f048f457cf42d358a07510b87626f316 1 parent bb70739
Reimar Döffinger authored
Showing with 27 additions and 0 deletions.
  1. +27 −0 libswscale/swscale_unscaled.c
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27 libswscale/swscale_unscaled.c
@@ -830,7 +830,34 @@ static int planarCopyWrapper(SwsContext *c, const uint8_t *src[],
srcPtr += srcStride[plane];
}
} else if (src_depth <= dst_depth) {
+ int orig_length = length;
for (i = 0; i < height; i++) {
+ if(isBE(c->srcFormat) == HAVE_BIGENDIAN &&
+ isBE(c->dstFormat) == HAVE_BIGENDIAN &&
+ shiftonly) {
+ unsigned shift = dst_depth - src_depth;
+ length = orig_length;
+#if HAVE_FAST_64BIT
+#define FAST_COPY_UP(shift) \
+ for (j = 0; j < length - 3; j += 4) { \
+ uint64_t v = AV_RN64A(srcPtr2 + j); \
+ AV_WN64A(dstPtr2 + j, v << shift); \
+ } \
+ length &= 3;
+#else
+#define FAST_COPY_UP(shift) \
+ for (j = 0; j < length - 1; j += 2) { \
+ uint32_t v = AV_RN32A(srcPtr2 + j); \
+ AV_WN32A(dstPtr2 + j, v << shift); \
+ } \
+ length &= 1;
+#endif
+ switch (shift)
+ {
+ case 6: FAST_COPY_UP(6); break;
+ case 7: FAST_COPY_UP(7); break;
+ }
+ }
#define COPY_UP(r,w) \
if(shiftonly){\
for (j = 0; j < length; j++){ \
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