M4VIFI_BGR565toYUV420.c revision 7c9d8018755adf1857571125ba1b3598c96ea506
1/* 2 * Copyright (C) 2004-2011 NXP Software 3 * Copyright (C) 2011 The Android Open Source Project 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17/** 18 **************************************************************************************** 19 * @file M4VIFI_BGR565toYUV420.c 20 * @brief Contain video library function 21 * @note Color Conversion Filter 22 * -# Contains the format conversion filters from BGR565 to YUV420 23 **************************************************************************************** 24*/ 25 26/* Prototypes of functions, and type definitions */ 27#include "M4VIFI_FiltersAPI.h" 28/* Macro definitions */ 29#include "M4VIFI_Defines.h" 30/* Clip table declaration */ 31#include "M4VIFI_Clip.h" 32 33/** 34 ***************************************************************************************** 35 * M4VIFI_UInt8 M4VIFI_BGR565toYUV420 (void *pUserData, M4VIFI_ImagePlane *pPlaneIn, 36 * M4VIFI_ImagePlane *pPlaneOut) 37 * @brief Transform BGR565 image to a YUV420 image. 38 * @note Convert BGR565 to YUV420, 39 * Loop on each row ( 2 rows by 2 rows ) 40 * Loop on each column ( 2 col by 2 col ) 41 * Get 4 BGR samples from input data and build 4 output Y samples 42 * and each single U & V data 43 * end loop on col 44 * end loop on row 45 * @param pUserData: (IN) User Specific Data 46 * @param pPlaneIn: (IN) Pointer to BGR565 Plane 47 * @param pPlaneOut: (OUT) Pointer to YUV420 buffer Plane 48 * @return M4VIFI_OK: there is no error 49 * @return M4VIFI_ILLEGAL_FRAME_HEIGHT: YUV Plane height is ODD 50 * @return M4VIFI_ILLEGAL_FRAME_WIDTH: YUV Plane width is ODD 51 ***************************************************************************************** 52*/ 53 54M4VIFI_UInt8 M4VIFI_BGR565toYUV420(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_bgr, u32_stride_2bgr; 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_bgrn_data, *pu8_bgrn; 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_bgrn_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_bgr = pPlaneIn->u_stride; 109 u32_stride_2bgr = u32_stride_bgr << 1; 110 111 /* Loop on each row of the output image, input coordinates are estimated from output ones */ 112 /* Two YUV rows are computed at each pass */ 113 for (u32_row = u32_height ;u32_row != 0; u32_row -=2) 114 { 115 /* Current Y plane row pointers */ 116 pu8_yn = pu8_y_data; 117 /* Next Y plane row pointers */ 118 pu8_ys = pu8_yn + u32_stride_Y; 119 /* Current U plane row pointer */ 120 pu8_u = pu8_u_data; 121 /* Current V plane row pointer */ 122 pu8_v = pu8_v_data; 123 124 pu8_bgrn = pu8_bgrn_data; 125 126 /* Loop on each column of the output image */ 127 for (u32_col = u32_width; u32_col != 0 ; u32_col -=2) 128 { 129 /* Get four BGR 565 samples from input data */ 130 u16_pix1 = *( (M4VIFI_UInt16 *) pu8_bgrn); 131 u16_pix2 = *( (M4VIFI_UInt16 *) (pu8_bgrn + CST_RGB_16_SIZE)); 132 u16_pix3 = *( (M4VIFI_UInt16 *) (pu8_bgrn + u32_stride_bgr)); 133 u16_pix4 = *( (M4VIFI_UInt16 *) (pu8_bgrn + u32_stride_bgr + CST_RGB_16_SIZE)); 134 /* Unpack RGB565 to 8bit R, G, B */ 135 /* (x,y) */ 136 GET_BGR565(i32_b00, i32_g00, i32_r00, u16_pix1); 137 /* (x+1,y) */ 138 GET_BGR565(i32_b10, i32_g10, i32_r10, u16_pix2); 139 /* (x,y+1) */ 140 GET_BGR565(i32_b01, i32_g01, i32_r01, u16_pix3); 141 /* (x+1,y+1) */ 142 GET_BGR565(i32_b11, i32_g11, i32_r11, u16_pix4); 143 144 /* Convert BGR value to YUV */ 145 i32_u00 = U16(i32_r00, i32_g00, i32_b00); 146 i32_v00 = V16(i32_r00, i32_g00, i32_b00); 147 /* luminance value */ 148 i32_y00 = Y16(i32_r00, i32_g00, i32_b00); 149 150 i32_u10 = U16(i32_r10, i32_g10, i32_b10); 151 i32_v10 = V16(i32_r10, i32_g10, i32_b10); 152 /* luminance value */ 153 i32_y10 = Y16(i32_r10, i32_g10, i32_b10); 154 155 i32_u01 = U16(i32_r01, i32_g01, i32_b01); 156 i32_v01 = V16(i32_r01, i32_g01, i32_b01); 157 /* luminance value */ 158 i32_y01 = Y16(i32_r01, i32_g01, i32_b01); 159 160 i32_u11 = U16(i32_r11, i32_g11, i32_b11); 161 i32_v11 = V16(i32_r11, i32_g11, i32_b11); 162 /* luminance value */ 163 i32_y11 = Y16(i32_r11, i32_g11, i32_b11); 164 165 /* Store luminance data */ 166 pu8_yn[0] = (M4VIFI_UInt8)i32_y00; 167 pu8_yn[1] = (M4VIFI_UInt8)i32_y10; 168 pu8_ys[0] = (M4VIFI_UInt8)i32_y01; 169 pu8_ys[1] = (M4VIFI_UInt8)i32_y11; 170 171 /* Store chroma data */ 172 *pu8_u = (M4VIFI_UInt8)((i32_u00 + i32_u01 + i32_u10 + i32_u11 + 2) >> 2); 173 *pu8_v = (M4VIFI_UInt8)((i32_v00 + i32_v01 + i32_v10 + i32_v11 + 2) >> 2); 174 175 /* Prepare for next column */ 176 pu8_bgrn += (CST_RGB_16_SIZE<<1); 177 /* Update current Y plane line pointer*/ 178 pu8_yn += 2; 179 /* Update next Y plane line pointer*/ 180 pu8_ys += 2; 181 /* Update U plane line pointer*/ 182 pu8_u ++; 183 /* Update V plane line pointer*/ 184 pu8_v ++; 185 } /* End of horizontal scanning */ 186 187 /* Prepare pointers for the next row */ 188 pu8_y_data += u32_stride2_Y; 189 pu8_u_data += u32_stride_U; 190 pu8_v_data += u32_stride_V; 191 pu8_bgrn_data += u32_stride_2bgr; 192 193 } /* End of vertical scanning */ 194 195 return M4VIFI_OK; 196} 197/* End of file M4VIFI_BGR565toYUV420.c */ 198 199