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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   const int ss_x = yv12->uv_crop_width < yv12->y_crop_width;
20   const int ss_y = yv12->uv_crop_height < yv12->y_crop_height;
21   int bps;
22   if (!ss_y) {
23     if (!ss_x) {
24       img->fmt = VPX_IMG_FMT_I444;
25       bps = 24;
26     } else {
27       img->fmt = VPX_IMG_FMT_I422;
28       bps = 16;
29     }
30   } else {
31     img->fmt = VPX_IMG_FMT_I420;
32     bps = 12;
33   }
34   img->bit_depth = 8;
35   img->w = yv12->y_stride;
36   img->h = ALIGN_POWER_OF_TWO(yv12->y_height + 2 * VP9_ENC_BORDER_IN_PIXELS, 3);
37   img->d_w = yv12->y_crop_width;
38   img->d_h = yv12->y_crop_height;
39   img->x_chroma_shift = ss_x;
40   img->y_chroma_shift = ss_y;
41   img->planes[VPX_PLANE_Y] = yv12->y_buffer;
42   img->planes[VPX_PLANE_U] = yv12->u_buffer;
43   img->planes[VPX_PLANE_V] = yv12->v_buffer;
44   img->planes[VPX_PLANE_ALPHA] = NULL;
45   img->stride[VPX_PLANE_Y] = yv12->y_stride;
46   img->stride[VPX_PLANE_U] = yv12->uv_stride;
47   img->stride[VPX_PLANE_V] = yv12->uv_stride;
48   img->stride[VPX_PLANE_ALPHA] = yv12->y_stride;
49 #if CONFIG_VP9_HIGHBITDEPTH
50   if (yv12->flags & YV12_FLAG_HIGHBITDEPTH) {
51     // vpx_image_t uses byte strides and a pointer to the first byte
52     // of the image.
53     img->fmt |= VPX_IMG_FMT_HIGHBITDEPTH;
54     img->bit_depth = yv12->bit_depth;
55     img->planes[VPX_PLANE_Y] = (uint8_t*)CONVERT_TO_SHORTPTR(yv12->y_buffer);
56     img->planes[VPX_PLANE_U] = (uint8_t*)CONVERT_TO_SHORTPTR(yv12->u_buffer);
57     img->planes[VPX_PLANE_V] = (uint8_t*)CONVERT_TO_SHORTPTR(yv12->v_buffer);
58     img->planes[VPX_PLANE_ALPHA] = NULL;
59     img->stride[VPX_PLANE_Y] = 2 * yv12->y_stride;
60     img->stride[VPX_PLANE_U] = 2 * yv12->uv_stride;
61     img->stride[VPX_PLANE_V] = 2 * yv12->uv_stride;
62     img->stride[VPX_PLANE_ALPHA] = 2 * yv12->y_stride;
63   }
64 #endif  // CONFIG_VP9_HIGHBITDEPTH
65   img->bps = bps;
66   img->user_priv = user_priv;
67   img->img_data = yv12->buffer_alloc;
68   img->img_data_owner = 0;
69   img->self_allocd = 0;
70 }
71
72 static vpx_codec_err_t image2yuvconfig(const vpx_image_t *img,
73                                        YV12_BUFFER_CONFIG *yv12) {
74   yv12->y_buffer = img->planes[VPX_PLANE_Y];
75   yv12->u_buffer = img->planes[VPX_PLANE_U];
76   yv12->v_buffer = img->planes[VPX_PLANE_V];
77
78   yv12->y_crop_width  = img->d_w;
79   yv12->y_crop_height = img->d_h;
80   yv12->y_width  = img->d_w;
81   yv12->y_height = img->d_h;
82
83   yv12->uv_width = img->x_chroma_shift == 1 ? (1 + yv12->y_width) / 2
84                                             : yv12->y_width;
85   yv12->uv_height = img->y_chroma_shift == 1 ? (1 + yv12->y_height) / 2
86                                              : yv12->y_height;
87
88   yv12->y_stride = img->stride[VPX_PLANE_Y];
89   yv12->uv_stride = img->stride[VPX_PLANE_U];
90
91 #if CONFIG_VP9_HIGHBITDEPTH
92   if (img->fmt & VPX_IMG_FMT_HIGHBITDEPTH) {
93     // In vpx_image_t
94     //     planes point to uint8 address of start of data
95     //     stride counts uint8s to reach next row
96     // In YV12_BUFFER_CONFIG
97     //     y_buffer, u_buffer, v_buffer point to uint16 address of data
98     //     stride and border counts in uint16s
99     // This means that all the address calculations in the main body of code
100     // should work correctly.
101     // However, before we do any pixel operations we need to cast the address
102     // to a uint16 ponter and double its value.
103     yv12->y_buffer = CONVERT_TO_BYTEPTR(yv12->y_buffer);
104     yv12->u_buffer = CONVERT_TO_BYTEPTR(yv12->u_buffer);
105     yv12->v_buffer = CONVERT_TO_BYTEPTR(yv12->v_buffer);
106     yv12->y_stride >>= 1;
107     yv12->uv_stride >>= 1;
108     yv12->flags = YV12_FLAG_HIGHBITDEPTH;
109   } else {
110     yv12->flags = 0;
111   }
112   yv12->border  = (yv12->y_stride - img->w) / 2;
113 #else
114   yv12->border  = (img->stride[VPX_PLANE_Y] - img->w) / 2;
115 #endif  // CONFIG_VP9_HIGHBITDEPTH
116
117   yv12->border  = (img->stride[VPX_PLANE_Y] - img->w) / 2;
118   return VPX_CODEC_OK;
119 }
120
121 #endif  // VP9_VP9_IFACE_COMMON_H_