shithub: libvpx

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Adjustment of GOP intra factor for multi-layer.

This provides and alternative (still to be tuned for edge cases)
approach to adjusting the gop intra factor when multi-layer coding
is in effect that does not alter single layer coding.

Change-Id: Iba86d65a6e68e86aa031b7e1f0b6a4c55761b1b8

--- a/vp9/encoder/vp9_firstpass.c

+++ b/vp9/encoder/vp9_firstpass.c

@@ -2482,6 +2482,8 @@

   const int is_key_frame = frame_is_intra_only(cm);

   const int arf_active_or_kf = is_key_frame || rc->source_alt_ref_active;

+  double gop_intra_factor = 1.0;

+

   // Reset the GF group data structures unless this is a key

   // frame in which case it will already have been done.

   if (is_key_frame == 0) {

@@ -2549,6 +2551,17 @@

       active_max_gf_interval = rc->frames_to_key / 2;

   }

+  if (cpi->multi_layer_arf) {

+    int layers = 0;

+    int max_layers = VPXMIN(MAX_ARF_LAYERS, cpi->oxcf.enable_auto_arf);

+

+    // Adapt the intra_error factor to active_max_gf_interval limit.

+    for (i = active_max_gf_interval; i > 0; i >>= 1) ++layers;

+

+    layers = VPXMIN(max_layers, layers);

+    gop_intra_factor += (layers * 0.25);

+  }

+

   i = 0;

   while (i < rc->static_scene_max_gf_interval && i < rc->frames_to_key) {

     ++i;

@@ -2625,7 +2638,7 @@

             (!flash_detected) &&

             ((mv_ratio_accumulator > mv_ratio_accumulator_thresh) ||

              (abs_mv_in_out_accumulator > abs_mv_in_out_thresh) ||

-             (sr_accumulator > next_frame.intra_error)))) {

+             (sr_accumulator > gop_intra_factor * next_frame.intra_error)))) {

       break;

     }