LV_MAP_MULTI: use reduced probability in EC.
Do not round the lv_map probabilities but instead
reduce the precision of the entropy coder to 9 bits
for all CDFs, and modify operation so that the EC
interval is never 0.
Change-Id: I1b4e51019613106ae3b68519b20637bc0d7b51be
diff --git a/aom_dsp/entcode.h b/aom_dsp/entcode.h
index 981a951..cb2c961 100644
--- a/aom_dsp/entcode.h
+++ b/aom_dsp/entcode.h
@@ -15,6 +15,14 @@
#include <stddef.h>
#include "av1/common/odintrin.h"
+#if CONFIG_LV_MAP_MULTI
+#define EC_PROB_SHIFT 6
+#define EC_MIN_PROB 4 // must be <= (1<<EC_PROB_SHIFT)/16
+#else
+#define EC_PROB_SHIFT 0
+#define EC_MIN_PROB 0
+#endif
+
/*OPT: od_ec_window must be at least 32 bits, but if you have fast arithmetic
on a larger type, you can speed up the decoder by using it here.*/
typedef uint32_t od_ec_window;
