Add CDF_STORAGE_REDUCTION experiment flag.

Change-Id: I8ce208e842b738bb729d5732f0f35366c3549063

aom_dsp/prob.h

@@ -31,8 +31,11 @@ extern "C" {
 typedef uint16_t aom_cdf_prob;
 
 #define CDF_SIZE(x) ((x) + 1)
-
+#if CONFIG_CDF_STORAGE_REDUCTION
+#define CDF_PROB_BITS 14
+#else
 #define CDF_PROB_BITS 15
+#endif
 #define CDF_PROB_TOP (1 << CDF_PROB_BITS)
 #define CDF_INIT_TOP 32768
 #define CDF_SHIFT (15 - CDF_PROB_BITS)

build/cmake/aom_config_defaults.cmake

@@ -92,6 +92,7 @@ set(CONFIG_AMVR 0 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_AOM_QM 1 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_AOM_QM_EXT 0 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_BGSPRITE 0 CACHE NUMBER "AV1 experiment flag.")
+set(CONFIG_CDF_STORAGE_REDUCTION 0 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_CFL 1 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_CICP 0 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_COLORSPACE_HEADERS 0 CACHE NUMBER "AV1 experiment flag.")