shithub: libvpx

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Refactor tpl dependency model to support multi-layer ARF updates

Refactor to form a systematic reference frame update system for
the temporal dependency model. This prepares to support the multi-
layer ARF system.

Change-Id: Idb90fbe3966695b487c1a0a52f4626b0b6807434

--- a/vp9/encoder/vp9_encoder.c

+++ b/vp9/encoder/vp9_encoder.c

@@ -5362,6 +5362,8 @@

   int gld_index = -1;

   int alt_index = -1;

   int lst_index = -1;

+  int arf_index_stack[MAX_ARF_LAYERS];

+  int arf_stack_size = 0;

   int extend_frame_count = 0;

   int pframe_qindex = cpi->tpl_stats[2].base_qindex;

@@ -5369,6 +5371,7 @@

   int8_t recon_frame_index[REFS_PER_FRAME + MAX_ARF_LAYERS];

   memset(recon_frame_index, -1, sizeof(recon_frame_index));

+  stack_init(arf_index_stack, MAX_ARF_LAYERS);

   // TODO(jingning): To be used later for gf frame type parsing.

   (void)gf_group;

@@ -5406,7 +5409,7 @@

   gld_index = 0;

   ++*tpl_group_frames;

-  // Initialize ARF frame

+  // Initialize base layer ARF frame

   gf_picture[1].frame = cpi->Source;

   gf_picture[1].ref_frame[0] = gld_index;

   gf_picture[1].ref_frame[1] = lst_index;

@@ -5427,8 +5430,27 @@

     gf_picture[frame_idx].ref_frame[1] = lst_index;

     gf_picture[frame_idx].ref_frame[2] = alt_index;

+    switch (gf_group->update_type[frame_idx]) {

+      case ARF_UPDATE:

+        stack_push(arf_index_stack, alt_index, arf_stack_size);

+        ++arf_stack_size;

+        alt_index = frame_idx;

+        break;

+      case LF_UPDATE: lst_index = frame_idx; break;

+      case OVERLAY_UPDATE:

+        gld_index = frame_idx;

+        alt_index = stack_pop(arf_index_stack, arf_stack_size);

+        --arf_stack_size;

+        break;

+      case USE_BUF_FRAME:

+        lst_index = frame_idx;

+        alt_index = stack_pop(arf_index_stack, arf_stack_size);

+        --arf_stack_size;

+        break;

+      default: break;

+    }

+

     ++*tpl_group_frames;

-    lst_index = frame_idx;

     // The length of group of pictures is baseline_gf_interval, plus the

     // beginning golden frame from last GOP, plus the last overlay frame in

@@ -5436,8 +5458,6 @@

     if (frame_idx == gf_group->gf_group_size) break;

   }

-  gld_index = frame_idx;

-  lst_index = VPXMAX(0, frame_idx - 1);

   alt_index = -1;

   ++frame_idx;