libvpx: Pull from upstream

source/libvpx/vp9/encoder/vp9_lookahead.h

 /*
  *  Copyright (c) 2011 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.
  */
 
 #ifndef VP9_ENCODER_VP9_LOOKAHEAD_H_
 #define VP9_ENCODER_VP9_LOOKAHEAD_H_
 
 #include "vpx_scale/yv12config.h"
 #include "vpx/vpx_integer.h"
 
+#ifdef CONFIG_SPATIAL_SVC
+#include "vpx/vp8cx.h"
+#include "vpx/vpx_encoder.h"
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 #define MAX_LAG_BUFFERS 25
 
 struct lookahead_entry {
   YV12_BUFFER_CONFIG  img;
   int64_t             ts_start;
   int64_t             ts_end;
   unsigned int        flags;
+
+#ifdef CONFIG_SPATIAL_SVC
+  vpx_svc_parameters_t svc_params[VPX_SS_MAX_LAYERS];
+#endif
 };
 
+// The max of past frames we want to keep in the queue.
+#define MAX_PRE_FRAMES 1
 
-struct lookahead_ctx;
+struct lookahead_ctx {
+  unsigned int max_sz;         /* Absolute size of the queue */
+  unsigned int sz;             /* Number of buffers currently in the queue */
+  unsigned int read_idx;       /* Read index */
+  unsigned int write_idx;      /* Write index */
+  struct lookahead_entry *buf; /* Buffer list */
+};
 
 /**\brief Initializes the lookahead stage
  *
  * The lookahead stage is a queue of frame buffers on which some analysis
  * may be done when buffers are enqueued.
  */
 struct lookahead_ctx *vp9_lookahead_init(unsigned int width,
                                          unsigned int height,
                                          unsigned int subsampling_x,
                                          unsigned int subsampling_y,
@@ skipping 53 matching lines @@
  *
  * \param[in] ctx       Pointer to the lookahead context
  */
 unsigned int vp9_lookahead_depth(struct lookahead_ctx *ctx);
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif
 
 #endif  // VP9_ENCODER_VP9_LOOKAHEAD_H_