create colorspace.h and use it where appropriate

patch by Ian Caulfield: /ian caulfield gmail com/

Originally committed as revision 9716 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 107 insertions, 0 deletions

diff --git a/libavcodec/colorspace.h b/libavcodec/colorspace.h
new file mode 100644
index 0000000000..7d0a6274ba
--- /dev/null
+++ b/libavcodec/colorspace.h
@@ -0,0 +1,107 @@
+/*
+ * 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
+ */
+
+#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)
+