libvpx: Pull from upstream

source/libvpx/vp9/encoder/vp9_svc_layercontext.h

Index: source/libvpx/vp9/encoder/vp9_svc_layercontext.h
===================================================================
--- source/libvpx/vp9/encoder/vp9_svc_layercontext.h	(revision 281795)
+++ source/libvpx/vp9/encoder/vp9_svc_layercontext.h	(working copy)
@@ -28,6 +28,7 @@
   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;
 } LAYER_CONTEXT;
 
 typedef struct {
@@ -74,6 +75,23 @@
 // Check if current layer is key frame in spatial upper layer
 int vp9_is_upper_layer_key_frame(const struct VP9_COMP *const cpi);
 
+// Copy the source image, flags and svc parameters into a new framebuffer
+// with the expected stride/border
+int vp9_svc_lookahead_push(const struct VP9_COMP *const cpi,
+                           struct lookahead_ctx *ctx, YV12_BUFFER_CONFIG *src,
+                           int64_t ts_start, int64_t ts_end,
+                           unsigned int flags);
+
+// Get the next source buffer to encode
+struct lookahead_entry *vp9_svc_lookahead_pop(struct VP9_COMP *const cpi,
+                                              struct lookahead_ctx *ctx,
+                                              int drain);
+
+// 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