1/*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16#include    "M4VIFI_FiltersAPI.h"
17
18#include    "M4VIFI_Defines.h"
19
20#include    "M4VIFI_Clip.h"
21
22/***************************************************************************
23Proto:
24M4VIFI_UInt8    M4VIFI_RGB888toYUV420(void *pUserData, M4VIFI_ImagePlane *PlaneIn,
25                                     M4VIFI_ImagePlane PlaneOut[3]);
26Purpose:    filling of the YUV420 plane from a BGR24 plane
27Abstract:    Loop on each row ( 2 rows by 2 rows )
28                Loop on each column ( 2 col by 2 col )
29                    Get 4 BGR samples from input data and build 4 output Y samples and
30                    each single U & V data
31                end loop on col
32            end loop on row
33
34In:            RGB24 plane
35InOut:        none
36Out:        array of 3 M4VIFI_ImagePlane structures
37Modified:    ML: RGB function modified to BGR.
38***************************************************************************/
39M4VIFI_UInt8 M4VIFI_RGB888toYUV420(void *pUserData, M4VIFI_ImagePlane *PlaneIn,
40                                    M4VIFI_ImagePlane PlaneOut[3])
41{
42    M4VIFI_UInt32    u32_width, u32_height;
43    M4VIFI_UInt32    u32_stride_Y, u32_stride2_Y, u32_stride_U, u32_stride_V, u32_stride_rgb,\
44                     u32_stride_2rgb;
45    M4VIFI_UInt32    u32_col, u32_row;
46
47    M4VIFI_Int32    i32_r00, i32_r01, i32_r10, i32_r11;
48    M4VIFI_Int32    i32_g00, i32_g01, i32_g10, i32_g11;
49    M4VIFI_Int32    i32_b00, i32_b01, i32_b10, i32_b11;
50    M4VIFI_Int32    i32_y00, i32_y01, i32_y10, i32_y11;
51    M4VIFI_Int32    i32_u00, i32_u01, i32_u10, i32_u11;
52    M4VIFI_Int32    i32_v00, i32_v01, i32_v10, i32_v11;
53    M4VIFI_UInt8    *pu8_yn, *pu8_ys, *pu8_u, *pu8_v;
54    M4VIFI_UInt8    *pu8_y_data, *pu8_u_data, *pu8_v_data;
55    M4VIFI_UInt8    *pu8_rgbn_data, *pu8_rgbn;
56
57    /* check sizes */
58    if( (PlaneIn->u_height != PlaneOut[0].u_height)            ||
59        (PlaneOut[0].u_height != (PlaneOut[1].u_height<<1))    ||
60        (PlaneOut[0].u_height != (PlaneOut[2].u_height<<1)))
61        return M4VIFI_ILLEGAL_FRAME_HEIGHT;
62
63    if( (PlaneIn->u_width != PlaneOut[0].u_width)        ||
64        (PlaneOut[0].u_width != (PlaneOut[1].u_width<<1))    ||
65        (PlaneOut[0].u_width != (PlaneOut[2].u_width<<1)))
66        return M4VIFI_ILLEGAL_FRAME_WIDTH;
67
68
69    /* set the pointer to the beginning of the output data buffers */
70    pu8_y_data    = PlaneOut[0].pac_data + PlaneOut[0].u_topleft;
71    pu8_u_data    = PlaneOut[1].pac_data + PlaneOut[1].u_topleft;
72    pu8_v_data    = PlaneOut[2].pac_data + PlaneOut[2].u_topleft;
73
74    /* idem for input buffer */
75    pu8_rgbn_data    = PlaneIn->pac_data + PlaneIn->u_topleft;
76
77    /* get the size of the output image */
78    u32_width    = PlaneOut[0].u_width;
79    u32_height    = PlaneOut[0].u_height;
80
81    /* set the size of the memory jumps corresponding to row jump in each output plane */
82    u32_stride_Y = PlaneOut[0].u_stride;
83    u32_stride2_Y= u32_stride_Y << 1;
84    u32_stride_U = PlaneOut[1].u_stride;
85    u32_stride_V = PlaneOut[2].u_stride;
86
87    /* idem for input plane */
88    u32_stride_rgb = PlaneIn->u_stride;
89    u32_stride_2rgb = u32_stride_rgb << 1;
90
91    /* loop on each row of the output image, input coordinates are estimated from output ones */
92    /* two YUV rows are computed at each pass */
93    for    (u32_row = u32_height ;u32_row != 0; u32_row -=2)
94    {
95        /* update working pointers */
96        pu8_yn    = pu8_y_data;
97        pu8_ys    = pu8_yn + u32_stride_Y;
98
99        pu8_u    = pu8_u_data;
100        pu8_v    = pu8_v_data;
101
102        pu8_rgbn= pu8_rgbn_data;
103
104        /* loop on each column of the output image*/
105        for    (u32_col = u32_width; u32_col != 0 ; u32_col -=2)
106        {
107            /* get RGB samples of 4 pixels */
108            GET_RGB24(i32_r00, i32_g00, i32_b00, pu8_rgbn, 0);
109            GET_RGB24(i32_r10, i32_g10, i32_b10, pu8_rgbn, CST_RGB_24_SIZE);
110            GET_RGB24(i32_r01, i32_g01, i32_b01, pu8_rgbn, u32_stride_rgb);
111            GET_RGB24(i32_r11, i32_g11, i32_b11, pu8_rgbn, u32_stride_rgb + CST_RGB_24_SIZE);
112
113            i32_u00    = U24(i32_r00, i32_g00, i32_b00);
114            i32_v00    = V24(i32_r00, i32_g00, i32_b00);
115            i32_y00    = Y24(i32_r00, i32_g00, i32_b00);        /* matrix luminance */
116            pu8_yn[0]= (M4VIFI_UInt8)i32_y00;
117
118            i32_u10    = U24(i32_r10, i32_g10, i32_b10);
119            i32_v10    = V24(i32_r10, i32_g10, i32_b10);
120            i32_y10    = Y24(i32_r10, i32_g10, i32_b10);
121            pu8_yn[1]= (M4VIFI_UInt8)i32_y10;
122
123            i32_u01    = U24(i32_r01, i32_g01, i32_b01);
124            i32_v01    = V24(i32_r01, i32_g01, i32_b01);
125            i32_y01    = Y24(i32_r01, i32_g01, i32_b01);
126            pu8_ys[0]= (M4VIFI_UInt8)i32_y01;
127
128            i32_u11    = U24(i32_r11, i32_g11, i32_b11);
129            i32_v11    = V24(i32_r11, i32_g11, i32_b11);
130            i32_y11    = Y24(i32_r11, i32_g11, i32_b11);
131            pu8_ys[1] = (M4VIFI_UInt8)i32_y11;
132
133            *pu8_u    = (M4VIFI_UInt8)((i32_u00 + i32_u01 + i32_u10 + i32_u11 + 2) >> 2);
134            *pu8_v    = (M4VIFI_UInt8)((i32_v00 + i32_v01 + i32_v10 + i32_v11 + 2) >> 2);
135
136            pu8_rgbn    +=  (CST_RGB_24_SIZE<<1);
137            pu8_yn        += 2;
138            pu8_ys        += 2;
139
140            pu8_u ++;
141            pu8_v ++;
142        } /* end of horizontal scanning */
143
144        pu8_y_data        += u32_stride2_Y;
145        pu8_u_data        += u32_stride_U;
146        pu8_v_data        += u32_stride_V;
147        pu8_rgbn_data    += u32_stride_2rgb;
148
149
150    } /* End of vertical scanning */
151
152    return M4VIFI_OK;
153}
154