Add function to take the difference between two frames
This will be used to compute the temporal derivative for disflow.
Change-Id: If121bab8495c3113f02e5bce7e7a35a9b8925a4a
diff --git a/av1/encoder/global_motion.c b/av1/encoder/global_motion.c
index b947bad..1ae568f 100644
--- a/av1/encoder/global_motion.c
+++ b/av1/encoder/global_motion.c
@@ -15,6 +15,8 @@
#include <math.h>
#include <assert.h>
+#include "config/aom_dsp_rtcd.h"
+
#include "av1/encoder/global_motion.h"
#include "av1/common/convolve.h"
@@ -489,6 +491,21 @@
output_vec[1] = -M[2] * mult_b0 + M_0 * mult_b1;
}
+static INLINE void image_difference(const uint8_t *src, int src_stride,
+ const uint8_t *ref, int ref_stride,
+ int16_t *dst, int dst_stride, int height,
+ int width) {
+ const int block_unit = 8;
+ // Take difference in 8x8 blocks to make use of optimized diff function
+ for (int i = 0; i < height; i += block_unit) {
+ for (int j = 0; j < width; j += block_unit) {
+ aom_subtract_block(block_unit, block_unit, dst + i * dst_stride + j,
+ dst_stride, src + i * src_stride + j, src_stride,
+ ref + i * ref_stride + j, ref_stride);
+ }
+ }
+}
+
// Compute an image gradient using a sobel filter.
// If dir == 1, compute the x gradient. If dir == 0, compute y. This function
// assumes the images have been padded so that they can be processed in units
