Add an expt to remove allow high precision mv flag

Change-Id: I3873acafcd9539da96f67328cdb8faf7798be90f

av1/decoder/decodeframe.c

@@ -3112,10 +3112,18 @@ static size_t read_uncompressed_header(AV1Decoder *pbi,
       if (cm->cur_frame_force_integer_mv) {
         cm->allow_high_precision_mv = 0;
       } else {
+#if CONFIG_EIGHTH_PEL_MV_ONLY
+        cm->allow_high_precision_mv = 1;
+#else
         cm->allow_high_precision_mv = aom_rb_read_bit(rb);
+#endif  // CONFIG_EIGHTH_PEL_MV_ONLY
       }
+#else
+#if CONFIG_EIGHTH_PEL_MV_ONLY
+      cm->allow_high_precision_mv = 1;
 #else
       cm->allow_high_precision_mv = aom_rb_read_bit(rb);
+#endif  // CONFIG_EIGHTH_PEL_MV_ONLY
 #endif
       cm->interp_filter = read_frame_interp_filter(rb);
 #if CONFIG_TEMPMV_SIGNALING

av1/encoder/bitstream.c

@@ -4030,10 +4030,14 @@ static void write_uncompressed_header_frame(AV1_COMP *cpi,
       if (cm->cur_frame_force_integer_mv) {
         cm->allow_high_precision_mv = 0;
       } else {
+#if !CONFIG_EIGHTH_PEL_MV_ONLY
         aom_wb_write_bit(wb, cm->allow_high_precision_mv);
+#endif  // !CONFIG_EIGHTH_PEL_MV_ONLY
       }
 #else
+#if !CONFIG_EIGHTH_PEL_MV_ONLY
       aom_wb_write_bit(wb, cm->allow_high_precision_mv);
+#endif  // !CONFIG_EIGHTH_PEL_MV_ONLY
 #endif
       fix_interp_filter(cm, cpi->td.counts);
       write_frame_interp_filter(cm->interp_filter, wb);

av1/encoder/encoder.c

@@ -2480,9 +2480,9 @@ void av1_change_config(struct AV1_COMP *cpi, const AV1EncoderConfig *oxcf) {
   set_compound_tools(cm);
   av1_reset_segment_features(cm);
 #if CONFIG_AMVR
-  set_high_precision_mv(cpi, 0, 0);
+  set_high_precision_mv(cpi, 1, 0);
 #else
-  set_high_precision_mv(cpi, 0);
+  set_high_precision_mv(cpi, 1);
 #endif
 
   set_rc_buffer_sizes(rc, &cpi->oxcf);
@@ -4121,10 +4121,18 @@ static void set_size_dependent_vars(AV1_COMP *cpi, int *q, int *bottom_index,
 
   if (!frame_is_intra_only(cm)) {
 #if CONFIG_AMVR
+#if CONFIG_EIGHTH_PEL_MV_ONLY
+    set_high_precision_mv(cpi, 1, cpi->common.cur_frame_force_integer_mv);
+#else
     set_high_precision_mv(cpi, (*q) < HIGH_PRECISION_MV_QTHRESH,
                           cpi->common.cur_frame_force_integer_mv);
+#endif  // CONFIG_EIGHTH_PEL_MV_ONLY
+#else
+#if CONFIG_EIGHTH_PEL_MV_ONLY
+    set_high_precision_mv(cpi, 1);
 #else
     set_high_precision_mv(cpi, (*q) < HIGH_PRECISION_MV_QTHRESH);
+#endif  // CONFIG_EIGHTH_PEL_MV_ONLY
 #endif
   }
 
@@ -6165,9 +6173,17 @@ int av1_get_compressed_data(AV1_COMP *cpi, unsigned int *frame_flags,
   aom_usec_timer_start(&cmptimer);
 
 #if CONFIG_AMVR
+#if CONFIG_EIGHTH_PEL_MV_ONLY
+  set_high_precision_mv(cpi, 1, 0);
+#else
   set_high_precision_mv(cpi, ALTREF_HIGH_PRECISION_MV, 0);
+#endif  // CONFIG_EIGHTH_PEL_MV_ONLY
+#else
+#if CONFIG_EIGHTH_PEL_MV_ONLY
+  set_high_precision_mv(cpi, 1);
 #else
   set_high_precision_mv(cpi, ALTREF_HIGH_PRECISION_MV);
+#endif  // CONFIG_EIGHTH_PEL_MV_ONLY
 #endif
 
   // Is multi-arf enabled.

build/cmake/aom_config_defaults.cmake

@@ -130,6 +130,7 @@ set(CONFIG_DEBLOCK_13TAP 1 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_DEPENDENT_HORZTILES 0 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_DIST_8X8 1 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_DUAL_FILTER 1 CACHE NUMBER "AV1 experiment flag.")
+set(CONFIG_EIGHTH_PEL_MV_ONLY 0 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_ENTROPY_STATS 0 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_EOB_FIRST 0 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_EXT_COMP_REFS 1 CACHE NUMBER "AV1 experiment flag.")

configure

@@ -342,6 +342,7 @@ EXPERIMENT_LIST="
     horzonly_frame_superres
     simple_bwd_adapt
     eob_first
+    eighth_pel_mv_only
 "
 CONFIG_LIST="
     dependency_tracking