M4VIFI_RGB565toYUV420.c revision b5c7784c96a606890eb8a8b560153ef4a5d1a0d9 
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
17/**
18 ******************************************************************************
19 * @brief    Contain video library function
20 * @note     Color Conversion Filter
21 *           Contains the format conversion filters from RGB565 to YUV420
22 ******************************************************************************
23*/
24
25/* Prototypes of functions, and type definitions */
26#include    "M4VIFI_FiltersAPI.h"
27/* Macro definitions */
28#include    "M4VIFI_Defines.h"
29/* Clip table declaration */
30#include    "M4VIFI_Clip.h"
31
32
33/**
34 ******************************************************************************
35 * M4VIFI_UInt8 M4VIFI_RGB565toYUV420 (void *pUserData,
36 *                                   M4VIFI_ImagePlane *pPlaneIn,
37 *                                   M4VIFI_ImagePlane *pPlaneOut)
38 * @brief   transform RGB565 image to a YUV420 image.
39 * @note    Convert RGB565 to YUV420,
40 *          Loop on each row ( 2 rows by 2 rows )
41 *              Loop on each column ( 2 col by 2 col )
42 *                  Get 4 RGB samples from input data and build 4 output Y samples
43 *                  and each single U & V data
44 *              end loop on col
45 *          end loop on row
46 * @param   pUserData: (IN) User Specific Data
47 * @param   pPlaneIn: (IN) Pointer to RGB565 Plane
48 * @param   pPlaneOut: (OUT) Pointer to  YUV420 buffer Plane
49 * @return  M4VIFI_OK: there is no error
50 * @return  M4VIFI_ILLEGAL_FRAME_HEIGHT: YUV Plane height is ODD
51 * @return  M4VIFI_ILLEGAL_FRAME_WIDTH:  YUV Plane width is ODD
52 ******************************************************************************
53*/
54M4VIFI_UInt8    M4VIFI_RGB565toYUV420(void *pUserData, M4VIFI_ImagePlane *pPlaneIn,
55                                                      M4VIFI_ImagePlane *pPlaneOut)
56{
57    M4VIFI_UInt32   u32_width, u32_height;
58    M4VIFI_UInt32   u32_stride_Y, u32_stride2_Y, u32_stride_U, u32_stride_V;
59    M4VIFI_UInt32   u32_stride_rgb, u32_stride_2rgb;
60    M4VIFI_UInt32   u32_col, u32_row;
61
62    M4VIFI_Int32    i32_r00, i32_r01, i32_r10, i32_r11;
63    M4VIFI_Int32    i32_g00, i32_g01, i32_g10, i32_g11;
64    M4VIFI_Int32    i32_b00, i32_b01, i32_b10, i32_b11;
65    M4VIFI_Int32    i32_y00, i32_y01, i32_y10, i32_y11;
66    M4VIFI_Int32    i32_u00, i32_u01, i32_u10, i32_u11;
67    M4VIFI_Int32    i32_v00, i32_v01, i32_v10, i32_v11;
68    M4VIFI_UInt8    *pu8_yn, *pu8_ys, *pu8_u, *pu8_v;
69    M4VIFI_UInt8    *pu8_y_data, *pu8_u_data, *pu8_v_data;
70    M4VIFI_UInt8    *pu8_rgbn_data, *pu8_rgbn;
71    M4VIFI_UInt16   u16_pix1, u16_pix2, u16_pix3, u16_pix4;
72
73    /* Check planes height are appropriate */
74    if ((pPlaneIn->u_height != pPlaneOut[0].u_height)           ||
75        (pPlaneOut[0].u_height != (pPlaneOut[1].u_height<<1))   ||
76        (pPlaneOut[0].u_height != (pPlaneOut[2].u_height<<1)))
77    {
78        return M4VIFI_ILLEGAL_FRAME_HEIGHT;
79    }
80
81    /* Check planes width are appropriate */
82    if ((pPlaneIn->u_width != pPlaneOut[0].u_width)         ||
83        (pPlaneOut[0].u_width != (pPlaneOut[1].u_width<<1)) ||
84        (pPlaneOut[0].u_width != (pPlaneOut[2].u_width<<1)))
85    {
86        return M4VIFI_ILLEGAL_FRAME_WIDTH;
87    }
88
89    /* Set the pointer to the beginning of the output data buffers */
90    pu8_y_data = pPlaneOut[0].pac_data + pPlaneOut[0].u_topleft;
91    pu8_u_data = pPlaneOut[1].pac_data + pPlaneOut[1].u_topleft;
92    pu8_v_data = pPlaneOut[2].pac_data + pPlaneOut[2].u_topleft;
93
94    /* Set the pointer to the beginning of the input data buffers */
95    pu8_rgbn_data   = pPlaneIn->pac_data + pPlaneIn->u_topleft;
96
97    /* Get the size of the output image */
98    u32_width = pPlaneOut[0].u_width;
99    u32_height = pPlaneOut[0].u_height;
100
101    /* Set the size of the memory jumps corresponding to row jump in each output plane */
102    u32_stride_Y = pPlaneOut[0].u_stride;
103    u32_stride2_Y = u32_stride_Y << 1;
104    u32_stride_U = pPlaneOut[1].u_stride;
105    u32_stride_V = pPlaneOut[2].u_stride;
106
107    /* Set the size of the memory jumps corresponding to row jump in input plane */
108    u32_stride_rgb = pPlaneIn->u_stride;
109    u32_stride_2rgb = u32_stride_rgb << 1;
110
111
112    /* Loop on each row of the output image, input coordinates are estimated from output ones */
113    /* Two YUV rows are computed at each pass */
114    for (u32_row = u32_height ;u32_row != 0; u32_row -=2)
115    {
116        /* Current Y plane row pointers */
117        pu8_yn = pu8_y_data;
118        /* Next Y plane row pointers */
119        pu8_ys = pu8_yn + u32_stride_Y;
120        /* Current U plane row pointer */
121        pu8_u = pu8_u_data;
122        /* Current V plane row pointer */
123        pu8_v = pu8_v_data;
124
125        pu8_rgbn = pu8_rgbn_data;
126
127        /* Loop on each column of the output image */
128        for (u32_col = u32_width; u32_col != 0 ; u32_col -=2)
129        {
130            /* Get four RGB 565 samples from input data */
131            u16_pix1 = *( (M4VIFI_UInt16 *) pu8_rgbn);
132            u16_pix2 = *( (M4VIFI_UInt16 *) (pu8_rgbn + CST_RGB_16_SIZE));
133            u16_pix3 = *( (M4VIFI_UInt16 *) (pu8_rgbn + u32_stride_rgb));
134            u16_pix4 = *( (M4VIFI_UInt16 *) (pu8_rgbn + u32_stride_rgb + CST_RGB_16_SIZE));
135
136            /* Unpack RGB565 to 8bit R, G, B */
137            /* (x,y) */
138            GET_RGB565(i32_r00,i32_g00,i32_b00,u16_pix1);
139            /* (x+1,y) */
140            GET_RGB565(i32_r10,i32_g10,i32_b10,u16_pix2);
141            /* (x,y+1) */
142            GET_RGB565(i32_r01,i32_g01,i32_b01,u16_pix3);
143            /* (x+1,y+1) */
144            GET_RGB565(i32_r11,i32_g11,i32_b11,u16_pix4);
145
146            /* Convert RGB value to YUV */
147            i32_u00 = U16(i32_r00, i32_g00, i32_b00);
148            i32_v00 = V16(i32_r00, i32_g00, i32_b00);
149            /* luminance value */
150            i32_y00 = Y16(i32_r00, i32_g00, i32_b00);
151
152            i32_u10 = U16(i32_r10, i32_g10, i32_b10);
153            i32_v10 = V16(i32_r10, i32_g10, i32_b10);
154            /* luminance value */
155            i32_y10 = Y16(i32_r10, i32_g10, i32_b10);
156
157            i32_u01 = U16(i32_r01, i32_g01, i32_b01);
158            i32_v01 = V16(i32_r01, i32_g01, i32_b01);
159            /* luminance value */
160            i32_y01 = Y16(i32_r01, i32_g01, i32_b01);
161
162            i32_u11 = U16(i32_r11, i32_g11, i32_b11);
163            i32_v11 = V16(i32_r11, i32_g11, i32_b11);
164            /* luminance value */
165            i32_y11 = Y16(i32_r11, i32_g11, i32_b11);
166
167            /* Store luminance data */
168            pu8_yn[0] = (M4VIFI_UInt8)i32_y00;
169            pu8_yn[1] = (M4VIFI_UInt8)i32_y10;
170            pu8_ys[0] = (M4VIFI_UInt8)i32_y01;
171            pu8_ys[1] = (M4VIFI_UInt8)i32_y11;
172
173            /* Store chroma data */
174            *pu8_u = (M4VIFI_UInt8)((i32_u00 + i32_u01 + i32_u10 + i32_u11 + 2) >> 2);
175            *pu8_v = (M4VIFI_UInt8)((i32_v00 + i32_v01 + i32_v10 + i32_v11 + 2) >> 2);
176
177            /* Prepare for next column */
178            pu8_rgbn += (CST_RGB_16_SIZE<<1);
179            /* Update current Y plane line pointer*/
180            pu8_yn += 2;
181            /* Update next Y plane line pointer*/
182            pu8_ys += 2;
183            /* Update U plane line pointer*/
184            pu8_u ++;
185            /* Update V plane line pointer*/
186            pu8_v ++;
187        } /* End of horizontal scanning */
188
189        /* Prepare pointers for the next row */
190        pu8_y_data += u32_stride2_Y;
191        pu8_u_data += u32_stride_U;
192        pu8_v_data += u32_stride_V;
193        pu8_rgbn_data += u32_stride_2rgb;
194
195
196    } /* End of vertical scanning */
197
198    return M4VIFI_OK;
199}
200
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202