Change buffer update rules on ARF overlay.

When coding the frame that corresponds to the midpoint frame
defining an ARF, do not update the last reference frame buffer.
Previously this buffer was updated meaning that when coding the next
ARF all the reference buffers were the same (or nearly so).
Turning the update off means that the frame before is still available
as an alternative predictor and for use in compound prediction.

Also fixed inconsistency in test for mismatch (patch from JK).

Net average gains (derf 0.049, yt 0.163, yt-hd 0.207, std-hd 0.286)

Change-Id: Ifee21da21ccbb1648ac2eafe890d3ce60562c7bc

1 files changed, 11 insertions, 7 deletions

diff --git a/vp9/encoder/vp9_onyx_if.c b/vp9/encoder/vp9_onyx_if.c
index ce91fb2f5..1403f506c 100644
--- a/vp9/encoder/vp9_onyx_if.c
+++ b/vp9/encoder/vp9_onyx_if.c
@@ -3492,7 +3492,7 @@ static void encode_frame_to_data_rate(VP9_COMP *cpi,
   // in this frame.
   update_base_skip_probs(cpi);
 
-#if 0// 1 && CONFIG_INTERNAL_STATS
+#if 0  // 1 && CONFIG_INTERNAL_STATS
   {
     FILE *f = fopen("tmp.stt", "a");
     int recon_err;
@@ -3505,13 +3505,13 @@ static void encode_frame_to_data_rate(VP9_COMP *cpi,
     if (cpi->twopass.total_left_stats->coded_error != 0.0)
       fprintf(f, "%10d %10d %10d %10d %10d %10d %10d %10d"
               "%7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f"
-              "%6d %5d %5d %5d %8.2f %10d %10.3f"
+              "%6d %6d %5d %5d %5d %8.2f %10d %10.3f"
               "%10.3f %8d %10d %10d %10d\n",
               cpi->common.current_video_frame, cpi->this_frame_target,
               cpi->projected_frame_size, 0, //loop_size_estimate,
               (cpi->projected_frame_size - cpi->this_frame_target),
               (int)cpi->total_target_vs_actual,
-              (cpi->oxcf.starting_buffer_level - cpi->bits_off_target),
+              (int)(cpi->oxcf.starting_buffer_level - cpi->bits_off_target),
               (int)cpi->total_actual_bits,
               vp9_convert_qindex_to_q(cm->base_qindex),
               (double)vp9_dc_quant(cm->base_qindex, 0) / 4.0,
@@ -3520,6 +3520,7 @@ static void encode_frame_to_data_rate(VP9_COMP *cpi,
               cpi->avg_q,
               vp9_convert_qindex_to_q(cpi->ni_av_qi),
               vp9_convert_qindex_to_q(cpi->cq_target_quality),
+              cpi->refresh_last_frame,
               cpi->refresh_golden_frame, cpi->refresh_alt_ref_frame,
               cm->frame_type, cpi->gfu_boost,
               cpi->twopass.est_max_qcorrection_factor,
@@ -3532,14 +3533,14 @@ static void encode_frame_to_data_rate(VP9_COMP *cpi,
     else
       fprintf(f, "%10d %10d %10d %10d %10d %10d %10d %10d"
               "%7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f"
-              "%5d %5d %8d %8d %8.2f %10d %10.3f"
+              "%5d %5d %5d %8d %8d %8.2f %10d %10.3f"
               "%8d %10d %10d %10d\n",
               cpi->common.current_video_frame,
               cpi->this_frame_target, cpi->projected_frame_size,
               0, //loop_size_estimate,
               (cpi->projected_frame_size - cpi->this_frame_target),
               (int)cpi->total_target_vs_actual,
-              (cpi->oxcf.starting_buffer_level - cpi->bits_off_target),
+              (int)(cpi->oxcf.starting_buffer_level - cpi->bits_off_target),
               (int)cpi->total_actual_bits,
               vp9_convert_qindex_to_q(cm->base_qindex),
               (double)vp9_dc_quant(cm->base_qindex, 0) / 4.0,
@@ -3548,6 +3549,7 @@ static void encode_frame_to_data_rate(VP9_COMP *cpi,
               cpi->avg_q,
               vp9_convert_qindex_to_q(cpi->ni_av_qi),
               vp9_convert_qindex_to_q(cpi->cq_target_quality),
+              cpi->refresh_last_frame,
               cpi->refresh_golden_frame, cpi->refresh_alt_ref_frame,
               cm->frame_type, cpi->gfu_boost,
               cpi->twopass.est_max_qcorrection_factor,
@@ -3791,8 +3793,10 @@ int vp9_get_compressed_data(VP9_PTR ptr, unsigned int *frame_flags,
       cpi->is_src_frame_alt_ref = cpi->alt_ref_source
                                   && (cpi->source == cpi->alt_ref_source);
 
-      if (cpi->is_src_frame_alt_ref)
+      if (cpi->is_src_frame_alt_ref) {
+        cpi->refresh_last_frame = 0;
         cpi->alt_ref_source = NULL;
+      }
     }
   }
 
@@ -3915,8 +3919,8 @@ int vp9_get_compressed_data(VP9_PTR ptr, unsigned int *frame_flags,
                sizeof(cm->fc));
   }
 
-  // if its a dropped frame honor the requests on subsequent frames
   if (*size > 0) {
+    // if its a dropped frame honor the requests on subsequent frames
     cpi->droppable = !frame_is_reference(cpi);
 
     // return to normal state