i420_rgb_c.h
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上传日期:2020-07-06
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midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * chroma_common.h: YUV transformation functions
- * Provides functions to perform the YUV conversion. The functions provided here
- * are a complete and portable C implementation, and may be replaced in certain
- * case by optimized functions.
- *****************************************************************************
- * Copyright (C) 1999, 2000 the VideoLAN team
- * $Id: ff7c26faf20f40a2b235907dd5b514d4bb5decf6 $
- *
- * Authors: Vincent Seguin <seguin@via.ecp.fr>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- *****************************************************************************/
- /*****************************************************************************
- * Constants
- *****************************************************************************/
- /* Margins and offsets in conversion tables - Margins are used in case a RGB
- * RGB conversion would give a value outside the 0-255 range. Offsets have been
- * calculated to avoid using the same cache line for 2 tables. conversion tables
- * are 2*MARGIN + 256 long and stores pixels.*/
- #define RED_MARGIN 178
- #define GREEN_MARGIN 135
- #define BLUE_MARGIN 224
- #define RED_OFFSET 1501 /* 1323 to 1935 */
- #define GREEN_OFFSET 135 /* 0 to 526 */
- #define BLUE_OFFSET 818 /* 594 to 1298 */
- #define RGB_TABLE_SIZE 1935 /* total table size */
- #define GRAY_MARGIN 384
- #define GRAY_TABLE_SIZE 1024 /* total table size */
- #define PALETTE_TABLE_SIZE 2176 /* YUV -> 8bpp palette lookup table */
- /* macros used for YUV pixel conversions */
- #define SHIFT 20
- #define U_GREEN_COEF ((int)(-0.391 * (1<<SHIFT) / 1.164))
- #define U_BLUE_COEF ((int)(2.018 * (1<<SHIFT) / 1.164))
- #define V_RED_COEF ((int)(1.596 * (1<<SHIFT) / 1.164))
- #define V_GREEN_COEF ((int)(-0.813 * (1<<SHIFT) / 1.164))