Testing of modes with Alt Ref frame

Previously when a frame was being overlaid on a previously coded
alt ref frame we only checked the alt ref 0,0 mode. Where there is
a possibility that the alt ref buffer is a filtered frame we should allow
the other prediction modes as normal or at the least allow use of
the last frame buffer.

Change-Id: I4d6227223d125c96b4f3066ec6ec9484fee7768c

vp8/encoder/pickinter.c

@@ -608,8 +608,10 @@ int vp8_pick_inter_mode(VP8_COMP *cpi, MACROBLOCK *x, int recon_yoffset, int rec
             memcpy(mdcounts, MDCounts[x->e_mbd.mode_info_context->mbmi.ref_frame], sizeof(mdcounts));
         }
 
-        //Only consider ZEROMV/ALTREF_FRAME for alt ref frame.
-        if (cpi->is_src_frame_alt_ref)
+        // Only consider ZEROMV/ALTREF_FRAME for alt ref frame,
+        // unless ARNR filtering is enabled in which case we want
+        // an unfiltered alternative
+        if (cpi->is_src_frame_alt_ref && (cpi->oxcf.arnr_max_frames == 0))
         {
             if (this_mode != ZEROMV || x->e_mbd.mode_info_context->mbmi.ref_frame != ALTREF_FRAME)
                 continue;

vp8/encoder/rdopt.c

@@ -1852,8 +1852,7 @@ int vp8_rd_pick_inter_mode(VP8_COMP *cpi, MACROBLOCK *x, int recon_yoffset, int
         // Only consider ZEROMV/ALTREF_FRAME for alt ref frame,
         // unless ARNR filtering is enabled in which case we want
         // an unfiltered alternative
-        //if (cpi->is_src_frame_alt_ref && (cpi->oxcf.arnr_max_frames > 0))
-        if (cpi->is_src_frame_alt_ref)
+        if (cpi->is_src_frame_alt_ref && (cpi->oxcf.arnr_max_frames == 0))
         {
             if (this_mode != ZEROMV || x->e_mbd.mode_info_context->mbmi.ref_frame != ALTREF_FRAME)
                 continue;