libvpx: Pull from upstream

source/libvpx/vp9/encoder/vp9_svc_layercontext.h

 /*
  *  Copyright (c) 2014 The WebM project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 11 matching lines @@
 typedef struct {
   RATE_CONTROL rc;
   int target_bandwidth;
   double framerate;
   int avg_frame_size;
   TWO_PASS twopass;
   struct vpx_fixed_buf rc_twopass_stats_in;
   unsigned int current_video_frame_in_layer;
   int is_key_frame;
   vpx_svc_parameters_t svc_params_received;
+  struct lookahead_entry  *alt_ref_source;
+  int alt_ref_idx;
+  int has_alt_frame;
+  size_t layer_size;
 } LAYER_CONTEXT;
 
 typedef struct {
   int spatial_layer_id;
   int temporal_layer_id;
   int number_spatial_layers;
   int number_temporal_layers;
+
+  // Store scaled source frames to be used for temporal filter to generate
+  // a alt ref frame.
+  YV12_BUFFER_CONFIG scaled_frames[MAX_LAG_BUFFERS];
+
   // Layer context used for rate control in one pass temporal CBR mode or
   // two pass spatial mode. Defined for temporal or spatial layers for now.
   // Does not support temporal combined with spatial RC.
   LAYER_CONTEXT layer_context[MAX(VPX_TS_MAX_LAYERS, VPX_SS_MAX_LAYERS)];
 } SVC;
 
 struct VP9_COMP;
 
 // Initialize layer context data from init_config().
 void vp9_init_layer_context(struct VP9_COMP *const cpi);
@@ skipping 41 matching lines @@
 // Get a future source buffer to encode
 struct lookahead_entry *vp9_svc_lookahead_peek(struct VP9_COMP *const cpi,
                                                struct lookahead_ctx *ctx,
                                                int index, int copy_params);
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif
 
 #endif  // VP9_ENCODER_VP9_SVC_LAYERCONTEXT_