libvpx: Add VP9 decoder.

source/libvpx/vp9/common/vp9_setupintrarecon.c

+/*
+ *  Copyright (c) 2010 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.
+ */
+
+
+#include "vp9/common/vp9_setupintrarecon.h"
+#include "vpx_mem/vpx_mem.h"
+
+void vp9_setup_intra_recon(YV12_BUFFER_CONFIG *ybf) {
+  int i;
+
+  /* set up frame new frame for intra coded blocks */
+  vpx_memset(ybf->y_buffer - 1 - ybf->y_stride, 127, ybf->y_width + 5);
+  for (i = 0; i < ybf->y_height; i++)
+    ybf->y_buffer[ybf->y_stride * i - 1] = (unsigned char) 129;
+
+  vpx_memset(ybf->u_buffer - 1 - ybf->uv_stride, 127, ybf->uv_width + 5);
+  for (i = 0; i < ybf->uv_height; i++)
+    ybf->u_buffer[ybf->uv_stride * i - 1] = (unsigned char) 129;
+
+  vpx_memset(ybf->v_buffer - 1 - ybf->uv_stride, 127, ybf->uv_width + 5);
+  for (i = 0; i < ybf->uv_height; i++)
+    ybf->v_buffer[ybf->uv_stride * i - 1] = (unsigned char) 129;
+
+}