vp9/vp9_iface_common.h

   1 /*
   2  *  Copyright (c) 2013 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 #ifndef VP9_VP9_IFACE_COMMON_H_
  11 #define VP9_VP9_IFACE_COMMON_H_
  12
  13 static void yuvconfig2image(vpx_image_t *img, const YV12_BUFFER_CONFIG  *yv12,
  14                             void *user_priv) {
  15   /** vpx_img_wrap() doesn't allow specifying independent strides for
  16     * the Y, U, and V planes, nor other alignment adjustments that
  17     * might be representable by a YV12_BUFFER_CONFIG, so we just
  18     * initialize all the fields.*/
  19   int bps = 12;
  20   if (yv12->uv_height == yv12->y_height) {
  21     if (yv12->uv_width == yv12->y_width) {
  22       img->fmt = VPX_IMG_FMT_I444;
  23       bps = 24;
  24     } else {
  25       img->fmt = VPX_IMG_FMT_I422;
  26       bps = 16;
  27     }
  28   } else {
  29     img->fmt = VPX_IMG_FMT_I420;
  30   }
  31   img->w = yv12->y_stride;
  32   img->h = ALIGN_POWER_OF_TWO(yv12->y_height + 2 * VP9BORDERINPIXELS, 3);
  33   img->d_w = yv12->y_crop_width;
  34   img->d_h = yv12->y_crop_height;
  35   img->x_chroma_shift = yv12->uv_width < yv12->y_width;
  36   img->y_chroma_shift = yv12->uv_height < yv12->y_height;
  37   img->planes[VPX_PLANE_Y] = yv12->y_buffer;
  38   img->planes[VPX_PLANE_U] = yv12->u_buffer;
  39   img->planes[VPX_PLANE_V] = yv12->v_buffer;
  40   img->planes[VPX_PLANE_ALPHA] = yv12->alpha_buffer;
  41   img->stride[VPX_PLANE_Y] = yv12->y_stride;
  42   img->stride[VPX_PLANE_U] = yv12->uv_stride;
  43   img->stride[VPX_PLANE_V] = yv12->uv_stride;
  44   img->stride[VPX_PLANE_ALPHA] = yv12->alpha_stride;
  45   img->bps = bps;
  46   img->user_priv = user_priv;
  47   img->img_data = yv12->buffer_alloc;
  48   img->img_data_owner = 0;
  49   img->self_allocd = 0;
  50 }
  51
  52 static vpx_codec_err_t image2yuvconfig(const vpx_image_t *img,
  53                                        YV12_BUFFER_CONFIG *yv12) {
  54   yv12->y_buffer = img->planes[VPX_PLANE_Y];
  55   yv12->u_buffer = img->planes[VPX_PLANE_U];
  56   yv12->v_buffer = img->planes[VPX_PLANE_V];
  57   yv12->alpha_buffer = img->planes[VPX_PLANE_ALPHA];
  58
  59   yv12->y_crop_width  = img->d_w;
  60   yv12->y_crop_height = img->d_h;
  61   yv12->y_width  = img->d_w;
  62   yv12->y_height = img->d_h;
  63
  64   yv12->uv_width = img->x_chroma_shift == 1 ? (1 + yv12->y_width) / 2
  65                                             : yv12->y_width;
  66   yv12->uv_height = img->y_chroma_shift == 1 ? (1 + yv12->y_height) / 2
  67                                              : yv12->y_height;
  68
  69   yv12->alpha_width = yv12->alpha_buffer ? img->d_w : 0;
  70   yv12->alpha_height = yv12->alpha_buffer ? img->d_h : 0;
  71
  72   yv12->y_stride = img->stride[VPX_PLANE_Y];
  73   yv12->uv_stride = img->stride[VPX_PLANE_U];
  74   yv12->alpha_stride = yv12->alpha_buffer ? img->stride[VPX_PLANE_ALPHA] : 0;
  75
  76   yv12->border  = (img->stride[VPX_PLANE_Y] - img->w) / 2;
  77 #if CONFIG_ALPHA
  78   // For development purposes, force alpha to hold the same data a Y for now.
  79   yv12->alpha_buffer = yv12->y_buffer;
  80   yv12->alpha_width = yv12->y_width;
  81   yv12->alpha_height = yv12->y_height;
  82   yv12->alpha_stride = yv12->y_stride;
  83 #endif
  84   return VPX_CODEC_OK;
  85 }
  86
  87 #endif  // VP9_VP9_IFACE_COMMON_H_