colorspace.h
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上传日期:2022-07-11
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- /*
- * Colorspace conversion defines
- * Copyright (c) 2001, 2002, 2003 Fabrice Bellard.
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
- /**
- * @file colorspace.h
- * Various defines for YUV<->RGB conversion
- */
- #ifndef AVCODEC_COLORSPACE_H
- #define AVCODEC_COLORSPACE_H
- #define SCALEBITS 10
- #define ONE_HALF (1 << (SCALEBITS - 1))
- #define FIX(x) ((int) ((x) * (1<<SCALEBITS) + 0.5))
- #define YUV_TO_RGB1_CCIR(cb1, cr1)
- {
- cb = (cb1) - 128;
- cr = (cr1) - 128;
- r_add = FIX(1.40200*255.0/224.0) * cr + ONE_HALF;
- g_add = - FIX(0.34414*255.0/224.0) * cb - FIX(0.71414*255.0/224.0) * cr +
- ONE_HALF;
- b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;
- }
- #define YUV_TO_RGB2_CCIR(r, g, b, y1)
- {
- y = ((y1) - 16) * FIX(255.0/219.0);
- r = cm[(y + r_add) >> SCALEBITS];
- g = cm[(y + g_add) >> SCALEBITS];
- b = cm[(y + b_add) >> SCALEBITS];
- }
- #define YUV_TO_RGB1(cb1, cr1)
- {
- cb = (cb1) - 128;
- cr = (cr1) - 128;
- r_add = FIX(1.40200) * cr + ONE_HALF;
- g_add = - FIX(0.34414) * cb - FIX(0.71414) * cr + ONE_HALF;
- b_add = FIX(1.77200) * cb + ONE_HALF;
- }
- #define YUV_TO_RGB2(r, g, b, y1)
- {
- y = (y1) << SCALEBITS;
- r = cm[(y + r_add) >> SCALEBITS];
- g = cm[(y + g_add) >> SCALEBITS];
- b = cm[(y + b_add) >> SCALEBITS];
- }
- #define Y_CCIR_TO_JPEG(y)
- cm[((y) * FIX(255.0/219.0) + (ONE_HALF - 16 * FIX(255.0/219.0))) >> SCALEBITS]
- #define Y_JPEG_TO_CCIR(y)
- (((y) * FIX(219.0/255.0) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS)
- #define C_CCIR_TO_JPEG(y)
- cm[(((y) - 128) * FIX(127.0/112.0) + (ONE_HALF + (128 << SCALEBITS))) >> SCALEBITS]
- /* NOTE: the clamp is really necessary! */
- static inline int C_JPEG_TO_CCIR(int y) {
- y = (((y - 128) * FIX(112.0/127.0) + (ONE_HALF + (128 << SCALEBITS))) >> SCALEBITS);
- if (y < 16)
- y = 16;
- return y;
- }
- #define RGB_TO_Y(r, g, b)
- ((FIX(0.29900) * (r) + FIX(0.58700) * (g) +
- FIX(0.11400) * (b) + ONE_HALF) >> SCALEBITS)
- #define RGB_TO_U(r1, g1, b1, shift)
- (((- FIX(0.16874) * r1 - FIX(0.33126) * g1 +
- FIX(0.50000) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)
- #define RGB_TO_V(r1, g1, b1, shift)
- (((FIX(0.50000) * r1 - FIX(0.41869) * g1 -
- FIX(0.08131) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)
- #define RGB_TO_Y_CCIR(r, g, b)
- ((FIX(0.29900*219.0/255.0) * (r) + FIX(0.58700*219.0/255.0) * (g) +
- FIX(0.11400*219.0/255.0) * (b) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS)
- #define RGB_TO_U_CCIR(r1, g1, b1, shift)
- (((- FIX(0.16874*224.0/255.0) * r1 - FIX(0.33126*224.0/255.0) * g1 +
- FIX(0.50000*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)
- #define RGB_TO_V_CCIR(r1, g1, b1, shift)
- (((FIX(0.50000*224.0/255.0) * r1 - FIX(0.41869*224.0/255.0) * g1 -
- FIX(0.08131*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)
- #endif /* AVCODEC_COLORSPACE_H */