libvpx: Add VP9 decoder.

source/libvpx/vp9/common/vp9_extend.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_extend.h"
+#include "vpx_mem/vpx_mem.h"
+
+static void copy_and_extend_plane(unsigned char *s, /* source */
+                                  int sp,           /* source pitch */
+                                  unsigned char *d, /* destination */
+                                  int dp,           /* destination pitch */
+                                  int h,            /* height */
+                                  int w,            /* width */
+                                  int et,           /* extend top border */
+                                  int el,           /* extend left border */
+                                  int eb,           /* extend bottom border */
+                                  int er) {         /* extend right border */
+  int i;
+  unsigned char *src_ptr1, *src_ptr2;
+  unsigned char *dest_ptr1, *dest_ptr2;
+  int linesize;
+
+  /* copy the left and right most columns out */
+  src_ptr1 = s;
+  src_ptr2 = s + w - 1;
+  dest_ptr1 = d - el;
+  dest_ptr2 = d + w;
+
+  for (i = 0; i < h; i++) {
+    vpx_memset(dest_ptr1, src_ptr1[0], el);
+    vpx_memcpy(dest_ptr1 + el, src_ptr1, w);
+    vpx_memset(dest_ptr2, src_ptr2[0], er);
+    src_ptr1  += sp;
+    src_ptr2  += sp;
+    dest_ptr1 += dp;
+    dest_ptr2 += dp;
+  }
+
+  /* Now copy the top and bottom lines into each line of the respective
+   * borders
+   */
+  src_ptr1 = d - el;
+  src_ptr2 = d + dp * (h - 1) - el;
+  dest_ptr1 = d + dp * (-et) - el;
+  dest_ptr2 = d + dp * (h) - el;
+  linesize = el + er + w;
+
+  for (i = 0; i < et; i++) {
+    vpx_memcpy(dest_ptr1, src_ptr1, linesize);
+    dest_ptr1 += dp;
+  }
+
+  for (i = 0; i < eb; i++) {
+    vpx_memcpy(dest_ptr2, src_ptr2, linesize);
+    dest_ptr2 += dp;
+  }
+}
+
+void vp9_copy_and_extend_frame(YV12_BUFFER_CONFIG *src,
+                               YV12_BUFFER_CONFIG *dst) {
+  int et = dst->border;
+  int el = dst->border;
+  int eb = dst->border + dst->y_height - src->y_height;
+  int er = dst->border + dst->y_width - src->y_width;
+
+  copy_and_extend_plane(src->y_buffer, src->y_stride,
+                        dst->y_buffer, dst->y_stride,
+                        src->y_height, src->y_width,
+                        et, el, eb, er);
+
+  et = dst->border >> 1;
+  el = dst->border >> 1;
+  eb = (dst->border >> 1) + dst->uv_height - src->uv_height;
+  er = (dst->border >> 1) + dst->uv_width - src->uv_width;
+
+  copy_and_extend_plane(src->u_buffer, src->uv_stride,
+                        dst->u_buffer, dst->uv_stride,
+                        src->uv_height, src->uv_width,
+                        et, el, eb, er);
+
+  copy_and_extend_plane(src->v_buffer, src->uv_stride,
+                        dst->v_buffer, dst->uv_stride,
+                        src->uv_height, src->uv_width,
+                        et, el, eb, er);
+}
+
+void vp9_copy_and_extend_frame_with_rect(YV12_BUFFER_CONFIG *src,
+                                         YV12_BUFFER_CONFIG *dst,
+                                         int srcy, int srcx,
+                                         int srch, int srcw) {
+  int et = dst->border;
+  int el = dst->border;
+  int eb = dst->border + dst->y_height - src->y_height;
+  int er = dst->border + dst->y_width - src->y_width;
+  int src_y_offset = srcy * src->y_stride + srcx;
+  int dst_y_offset = srcy * dst->y_stride + srcx;
+  int src_uv_offset = ((srcy * src->uv_stride) >> 1) + (srcx >> 1);
+  int dst_uv_offset = ((srcy * dst->uv_stride) >> 1) + (srcx >> 1);
+
+  // If the side is not touching the bounder then don't extend.
+  if (srcy)
+    et = 0;
+  if (srcx)
+    el = 0;
+  if (srcy + srch != src->y_height)
+    eb = 0;
+  if (srcx + srcw != src->y_width)
+    er = 0;
+
+  copy_and_extend_plane(src->y_buffer + src_y_offset,
+                        src->y_stride,
+                        dst->y_buffer + dst_y_offset,
+                        dst->y_stride,
+                        srch, srcw,
+                        et, el, eb, er);
+
+  et = (et + 1) >> 1;
+  el = (el + 1) >> 1;
+  eb = (eb + 1) >> 1;
+  er = (er + 1) >> 1;
+  srch = (srch + 1) >> 1;
+  srcw = (srcw + 1) >> 1;
+
+  copy_and_extend_plane(src->u_buffer + src_uv_offset,
+                        src->uv_stride,
+                        dst->u_buffer + dst_uv_offset,
+                        dst->uv_stride,
+                        srch, srcw,
+                        et, el, eb, er);
+
+  copy_and_extend_plane(src->v_buffer + src_uv_offset,
+                        src->uv_stride,
+                        dst->v_buffer + dst_uv_offset,
+                        dst->uv_stride,
+                        srch, srcw,
+                        et, el, eb, er);
+}
+
+/* note the extension is only for the last row, for intra prediction purpose */
+void vp9_extend_mb_row(YV12_BUFFER_CONFIG *ybf, unsigned char *YPtr,
+                       unsigned char *UPtr, unsigned char *VPtr) {
+  int i;
+
+  YPtr += ybf->y_stride * 14;
+  UPtr += ybf->uv_stride * 6;
+  VPtr += ybf->uv_stride * 6;
+
+  for (i = 0; i < 4; i++) {
+    YPtr[i] = YPtr[-1];
+    UPtr[i] = UPtr[-1];
+    VPtr[i] = VPtr[-1];
+  }
+
+  YPtr += ybf->y_stride;
+  UPtr += ybf->uv_stride;
+  VPtr += ybf->uv_stride;
+
+  for (i = 0; i < 4; i++) {
+    YPtr[i] = YPtr[-1];
+    UPtr[i] = UPtr[-1];
+    VPtr[i] = VPtr[-1];
+  }
+}