commit 26d3d3af6ace50ee20c474771a580e38f86c7864
author Jingning Han <jingning@google.com> Mon Mar 30 12:31:46 2015 -0700
committer Gerrit Code Review <gerrit@gerrit.golo.chromium.org> Mon Mar 30 15:43:31 2015 -0700
tree e5efddaeb43107841dd63e0a0a3607533390728c
parent b4b5af6acddfec0bf28a79f74afb15de3dee6f66

Enable 16x16 Hadamard transform in SATD based mode decision

This commit replaces the 16x16 2D-DCT transform with Hadamard
transform for RTC coding mode. It reduces the CPU cycles cost
on 16x16 transform by 5X. Overall it makes the speed -6 encoding
speed 1.5% faster without compromise on compression performance.

Change-Id: If6c993831dc4c678d841edc804ff395ed37f2a1b

vp9/encoder/vp9_avg.c

diff --git a/vp9/encoder/vp9_avg.c b/vp9/encoder/vp9_avg.c
index b5632a2..58daa3a 100644
--- a/vp9/encoder/vp9_avg.c
+++ b/vp9/encoder/vp9_avg.c
@@ -78,8 +78,15 @@
 }
 
 // In place 16x16 2D Hadamard transform
-void vp9_hadamard_16x16_c(int16_t *coeff) {
+void vp9_hadamard_16x16_c(int16_t const *src_diff, int src_stride,
+                          int16_t *coeff) {
   int idx;
+  for (idx = 0; idx < 4; ++idx) {
+    int16_t const *src_ptr = src_diff + (idx >> 1) * 8 * src_stride
+                                + (idx & 0x01) * 8;
+    vp9_hadamard_8x8_c(src_ptr, src_stride, coeff + idx * 64);
+  }
+
   for (idx = 0; idx < 64; ++idx) {
     int16_t a0 = coeff[0];
     int16_t a1 = coeff[64];