granicus.if.org Git - libvpx/blob - 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;
  20   if (!yv12->subsampling_y) {
  21     if (!yv12->subsampling_x) {
  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     if (!yv12->subsampling_x) {
  30       img->fmt = VPX_IMG_FMT_I440;
  31       bps = 16;
  32     } else {
  33       img->fmt = VPX_IMG_FMT_I420;
  34       bps = 12;
  35     }
  36   }
  37   img->cs = yv12->color_space;
  38   img->bit_depth = 8;
  39   img->w = yv12->y_stride;
  40   img->h = ALIGN_POWER_OF_TWO(yv12->y_height + 2 * VP9_ENC_BORDER_IN_PIXELS, 3);
  41   img->d_w = yv12->y_crop_width;
  42   img->d_h = yv12->y_crop_height;
  43   img->x_chroma_shift = yv12->subsampling_x;
  44   img->y_chroma_shift = yv12->subsampling_y;
  45   img->planes[VPX_PLANE_Y] = yv12->y_buffer;
  46   img->planes[VPX_PLANE_U] = yv12->u_buffer;
  47   img->planes[VPX_PLANE_V] = yv12->v_buffer;
  48   img->planes[VPX_PLANE_ALPHA] = NULL;
  49   img->stride[VPX_PLANE_Y] = yv12->y_stride;
  50   img->stride[VPX_PLANE_U] = yv12->uv_stride;
  51   img->stride[VPX_PLANE_V] = yv12->uv_stride;
  52   img->stride[VPX_PLANE_ALPHA] = yv12->y_stride;
  53 #if CONFIG_VP9_HIGHBITDEPTH
  54   if (yv12->flags & YV12_FLAG_HIGHBITDEPTH) {
  55     // vpx_image_t uses byte strides and a pointer to the first byte
  56     // of the image.
  57     img->fmt |= VPX_IMG_FMT_HIGHBITDEPTH;
  58     img->bit_depth = yv12->bit_depth;
  59     img->planes[VPX_PLANE_Y] = (uint8_t*)CONVERT_TO_SHORTPTR(yv12->y_buffer);
  60     img->planes[VPX_PLANE_U] = (uint8_t*)CONVERT_TO_SHORTPTR(yv12->u_buffer);
  61     img->planes[VPX_PLANE_V] = (uint8_t*)CONVERT_TO_SHORTPTR(yv12->v_buffer);
  62     img->planes[VPX_PLANE_ALPHA] = NULL;
  63     img->stride[VPX_PLANE_Y] = 2 * yv12->y_stride;
  64     img->stride[VPX_PLANE_U] = 2 * yv12->uv_stride;
  65     img->stride[VPX_PLANE_V] = 2 * yv12->uv_stride;
  66     img->stride[VPX_PLANE_ALPHA] = 2 * yv12->y_stride;
  67   }
  68 #endif  // CONFIG_VP9_HIGHBITDEPTH
  69   img->bps = bps;
  70   img->user_priv = user_priv;
  71   img->img_data = yv12->buffer_alloc;
  72   img->img_data_owner = 0;
  73   img->self_allocd = 0;
  74 }
  75
  76 static vpx_codec_err_t image2yuvconfig(const vpx_image_t *img,
  77                                        YV12_BUFFER_CONFIG *yv12) {
  78   yv12->y_buffer = img->planes[VPX_PLANE_Y];
  79   yv12->u_buffer = img->planes[VPX_PLANE_U];
  80   yv12->v_buffer = img->planes[VPX_PLANE_V];
  81
  82   yv12->y_crop_width  = img->d_w;
  83   yv12->y_crop_height = img->d_h;
  84   yv12->y_width  = img->d_w;
  85   yv12->y_height = img->d_h;
  86
  87   yv12->uv_width = img->x_chroma_shift == 1 ? (1 + yv12->y_width) / 2
  88                                             : yv12->y_width;
  89   yv12->uv_height = img->y_chroma_shift == 1 ? (1 + yv12->y_height) / 2
  90                                              : yv12->y_height;
  91   yv12->uv_crop_width = yv12->uv_width;
  92   yv12->uv_crop_height = yv12->uv_height;
  93
  94   yv12->y_stride = img->stride[VPX_PLANE_Y];
  95   yv12->uv_stride = img->stride[VPX_PLANE_U];
  96   yv12->color_space = img->cs;
  97
  98 #if CONFIG_VP9_HIGHBITDEPTH
  99   if (img->fmt & VPX_IMG_FMT_HIGHBITDEPTH) {
 100     // In vpx_image_t
 101     //     planes point to uint8 address of start of data
 102     //     stride counts uint8s to reach next row
 103     // In YV12_BUFFER_CONFIG
 104     //     y_buffer, u_buffer, v_buffer point to uint16 address of data
 105     //     stride and border counts in uint16s
 106     // This means that all the address calculations in the main body of code
 107     // should work correctly.
 108     // However, before we do any pixel operations we need to cast the address
 109     // to a uint16 ponter and double its value.
 110     yv12->y_buffer = CONVERT_TO_BYTEPTR(yv12->y_buffer);
 111     yv12->u_buffer = CONVERT_TO_BYTEPTR(yv12->u_buffer);
 112     yv12->v_buffer = CONVERT_TO_BYTEPTR(yv12->v_buffer);
 113     yv12->y_stride >>= 1;
 114     yv12->uv_stride >>= 1;
 115     yv12->flags = YV12_FLAG_HIGHBITDEPTH;
 116   } else {
 117     yv12->flags = 0;
 118   }
 119   yv12->border  = (yv12->y_stride - img->w) / 2;
 120 #else
 121   yv12->border  = (img->stride[VPX_PLANE_Y] - img->w) / 2;
 122 #endif  // CONFIG_VP9_HIGHBITDEPTH
 123   yv12->subsampling_x = img->x_chroma_shift;
 124   yv12->subsampling_y = img->y_chroma_shift;
 125   return VPX_CODEC_OK;
 126 }
 127
 128 #endif  // VP9_VP9_IFACE_COMMON_H_