shithub: libvpx

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Add MID_OVERLAY_UPDATE frame type

Add a MID_OVERLAY_UPDATE abstract to support multi-layer
ARF-Overlay frame based approach. When setting the frame update
type to be USE_BUF_FRAME, the encoder will use show_existing_frame
to process the intermediate ARF frames. When setting the frame
update type to be MID_OVERLAY_UPDATE, the intermediate ARF frames
will go through an overlay frame for display.

Change-Id: Ia0c91452c09d39312ac22d855cdf681b7da851c5

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

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

@@ -3058,6 +3058,12 @@

              cpi->interp_filter_selected[0],

              sizeof(cpi->interp_filter_selected[0]));

   }

+

+  if (gf_group->update_type[gf_group->index] == MID_OVERLAY_UPDATE) {

+    cpi->alt_fb_idx =

+        stack_pop(gf_group->arf_index_stack, gf_group->stack_size);

+    --gf_group->stack_size;

+  }

 }

 void vp9_update_reference_frames(VP9_COMP *cpi) {

--- a/vp9/encoder/vp9_firstpass.h

+++ b/vp9/encoder/vp9_firstpass.h

@@ -117,8 +117,9 @@

   GF_UPDATE = 2,

   ARF_UPDATE = 3,

   OVERLAY_UPDATE = 4,

-  USE_BUF_FRAME = 5,  // Use show existing frame, no ref buffer update

-  FRAME_UPDATE_TYPES = 6

+  MID_OVERLAY_UPDATE = 5,

+  USE_BUF_FRAME = 6,  // Use show existing frame, no ref buffer update

+  FRAME_UPDATE_TYPES = 7

 } FRAME_UPDATE_TYPE;

 #define FC_ANIMATION_THRESH 0.15

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

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

@@ -1445,6 +1445,12 @@

       cpi->refresh_alt_ref_frame = 0;

       cpi->rc.is_src_frame_alt_ref = 1;

       break;

+    case MID_OVERLAY_UPDATE:

+      cpi->refresh_last_frame = 1;

+      cpi->refresh_golden_frame = 0;

+      cpi->refresh_alt_ref_frame = 0;

+      cpi->rc.is_src_frame_alt_ref = 1;

+      break;

     case USE_BUF_FRAME:

       cpi->refresh_last_frame = 0;

       cpi->refresh_golden_frame = 0;