vpx_scale/generic/yv12config.c

   1 /*
   2  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
   3  *
   4  *  Use of this source code is governed by a BSD-style license
   5  *  that can be found in the LICENSE file in the root of the source
   6  *  tree. An additional intellectual property rights grant can be found
   7  *  in the file PATENTS.  All contributing project authors may
   8  *  be found in the AUTHORS file in the root of the source tree.
   9  */
  10
  11
  12 #include "vpx_scale/yv12config.h"
  13 #include "vpx_mem/vpx_mem.h"
  14
  15 /****************************************************************************
  16 *  Exports
  17 ****************************************************************************/
  18
  19 /****************************************************************************
  20  *
  21  ****************************************************************************/
  22 int
  23 vp8_yv12_de_alloc_frame_buffer(YV12_BUFFER_CONFIG *ybf)
  24 {
  25     if (ybf)
  26     {
  27             duck_free(ybf->buffer_alloc);
  28
  29         ybf->buffer_alloc = 0;
  30     }
  31     else
  32     {
  33         return -1;
  34     }
  35
  36     return 0;
  37 }
  38
  39 /****************************************************************************
  40  *
  41  ****************************************************************************/
  42 int
  43 vp8_yv12_alloc_frame_buffer(YV12_BUFFER_CONFIG *ybf, int width, int height, int border)
  44 {
  45 /*NOTE:*/
  46
  47     int yplane_size = (height + 2 * border) * (width + 2 * border);
  48     int uvplane_size = ((1 + height) / 2 + border) * ((1 + width) / 2 + border);
  49
  50     if (ybf)
  51     {
  52         vp8_yv12_de_alloc_frame_buffer(ybf);
  53
  54         ybf->y_width  = width;
  55         ybf->y_height = height;
  56         ybf->y_stride = width + 2 * border;
  57
  58         ybf->uv_width = (1 + width) / 2;
  59         ybf->uv_height = (1 + height) / 2;
  60         ybf->uv_stride = ybf->uv_width + border;
  61
  62         ybf->border = border;
  63         ybf->frame_size = yplane_size + 2 * uvplane_size;
  64
  65         /* Added 2 extra lines to framebuffer so that copy12x12 doesn't fail
  66          * when we have a large motion vector in V on the last v block.
  67          * Note : We never use these pixels anyway so this doesn't hurt.
  68          */
  69         ybf->buffer_alloc = (unsigned char *) duck_memalign(32,  ybf->frame_size + (ybf->y_stride * 2) + 32, 0);
  70
  71         if (ybf->buffer_alloc == NULL)
  72             return -1;
  73
  74         ybf->y_buffer = ybf->buffer_alloc + (border * ybf->y_stride) + border;
  75
  76         if (yplane_size & 0xf)
  77             yplane_size += 16 - (yplane_size & 0xf);
  78
  79         ybf->u_buffer = ybf->buffer_alloc + yplane_size + (border / 2  * ybf->uv_stride) + border / 2;
  80         ybf->v_buffer = ybf->buffer_alloc + yplane_size + uvplane_size + (border / 2  * ybf->uv_stride) + border / 2;
  81
  82         ybf->corrupted = 0; /* assume not currupted by errors */
  83     }
  84     else
  85     {
  86         return -2;
  87     }
  88
  89     return 0;
  90 }