shithub: libvpx

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vp9: Fix to the svc buffer update

Condition the pre-encode buffer update based on
TS diff on temporal layers = 1 for now, as some
fix is needed for the case where #temporal_layers > 1.

Change-Id: I58163b956db415217e4687a31f8ba110545b09f5

--- a/test/svc_datarate_test.cc

+++ b/test/svc_datarate_test.cc

@@ -1163,7 +1163,7 @@

   AssignLayerBitrates();

   ASSERT_NO_FATAL_FAILURE(RunLoop(&video));

   // TODO(jianj): webm:1554

-  CheckLayerRateTargeting(number_spatial_layers_, number_temporal_layers_, 0.76,

+  CheckLayerRateTargeting(number_spatial_layers_, number_temporal_layers_, 0.70,

                           1.15);

 #if CONFIG_VP9_DECODER

   // The non-reference frames are expected to be mismatched frames as the

--- a/test/vp9_datarate_test.cc

+++ b/test/vp9_datarate_test.cc

@@ -649,7 +649,7 @@

         << " The datarate for the file is lower than target by too much, "

            "for layer: "

         << j;

-    ASSERT_LE(effective_datarate_[j], cfg_.layer_target_bitrate[j] * 1.15)

+    ASSERT_LE(effective_datarate_[j], cfg_.layer_target_bitrate[j] * 1.20)

         << " The datarate for the file is greater than target by too much, "

            "for layer: "

         << j;

--- a/vp9/encoder/vp9_ratectrl.c

+++ b/vp9/encoder/vp9_ratectrl.c

@@ -274,12 +274,12 @@

         LAYER_IDS_TO_IDX(svc->spatial_layer_id, i, svc->number_temporal_layers);

     LAYER_CONTEXT *const lc = &svc->layer_context[layer];

     RATE_CONTROL *const lrc = &lc->rc;

-    if (use_timestamp && cpi->svc.use_set_ref_frame_config && ts_delta > 0 &&

+    if (use_timestamp && cpi->svc.use_set_ref_frame_config &&

+        svc->number_temporal_layers == 1 && ts_delta > 0 &&

         svc->current_superframe > 0) {

+      // TODO(marpan): This may need to be modified for temporal layers.

       const double framerate_pts = 10000000.0 / ts_delta;

-      const double lc_framerate_pts =

-          framerate_pts / cpi->oxcf.ts_rate_decimator[i];

-      lrc->bits_off_target += (int)(lc->target_bandwidth / lc_framerate_pts);

+      lrc->bits_off_target += (int)(lc->target_bandwidth / framerate_pts);

     } else {

       lrc->bits_off_target += (int)(lc->target_bandwidth / lc->framerate);

     }