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 */ 54 M4VIFI_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 } 200 201 202
