Fix frame scaling prediction
Use higher precision offsets for more accurate predictor
generation when references are at a different scale from
the coded frame.
Change-Id: I4c2c0ec67fa4824273cb3bd072211f41ac7802e8
diff --git a/aom_dsp/aom_filter.h b/aom_dsp/aom_filter.h
index 04d113d..58e8bb2 100644
--- a/aom_dsp/aom_filter.h
+++ b/aom_dsp/aom_filter.h
@@ -25,6 +25,12 @@
#define SUBPEL_SHIFTS (1 << SUBPEL_BITS)
#define SUBPEL_TAPS 8
+#define SCALE_SUBPEL_BITS 10
+#define SCALE_SUBPEL_SHIFTS (1 << SCALE_SUBPEL_BITS)
+#define SCALE_SUBPEL_MASK (SCALE_SUBPEL_SHIFTS - 1)
+#define SCALE_EXTRA_BITS (SCALE_SUBPEL_BITS - SUBPEL_BITS)
+#define SCALE_EXTRA_OFF ((1 << SCALE_EXTRA_BITS) / 2)
+
typedef int16_t InterpKernel[SUBPEL_TAPS];
#define BIL_SUBPEL_BITS 3
