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diff --git a/src/color_matrix.h b/src/color_matrix.h
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+++ b/src/color_matrix.h
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+/*
+ *  color_matrix.h - Color matrix utilities
+ *
+ *  xvba-video (C) 2009-2011 Splitted-Desktop Systems
+ *
+ *  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
+ */
+
+#ifndef COLOR_MATRIX_H
+#define COLOR_MATRIX_H
+
+typedef float ColorMatrix[4][4];
+
+// Assign color matrix A to M
+void cm_copy(ColorMatrix m, ColorMatrix a)
+    attribute_hidden;
+
+// Multiply color matrices A and B and set the result to M
+void cm_multiply(ColorMatrix m, ColorMatrix a, ColorMatrix b)
+    attribute_hidden;
+
+// Create a new identity matrix
+void cm_set_identity(ColorMatrix m)
+    attribute_hidden;
+
+// Return CONTRAST value range
+void cm_get_brightness_range(float *vstart, float *vend, float *vdefault)
+    attribute_hidden;
+
+// Create a new color matrix with a specific BRIGHTNESS value
+void cm_set_brightness(ColorMatrix m, float brightness)
+    attribute_hidden;
+
+// Return CONTRAST value range
+void cm_get_contrast_range(float *vstart, float *vend, float *vdefault)
+    attribute_hidden;
+
+// Create a new color matrix with a specific CONTRAST value
+void cm_set_contrast(ColorMatrix m, float contrast)
+    attribute_hidden;
+
+// Return SATURATION value range
+void cm_get_saturation_range(float *vstart, float *vend, float *vdefault)
+    attribute_hidden;
+
+// Create a new color matrix used for SATURATION
+void cm_set_saturation(ColorMatrix m, float saturation)
+    attribute_hidden;
+
+// Return the HUE value range
+void cm_get_hue_range(float *vstart, float *vend, float *vdefault)
+    attribute_hidden;
+
+// Create a new color matrix used for HUE rotation
+void cm_set_hue(ColorMatrix m, float hue)
+    attribute_hidden;
+
+// Create composite matrix from brightness/contrast/saturation/hue matrices
+void cm_composite(
+    ColorMatrix m,
+    ColorMatrix b,
+    ColorMatrix c,
+    ColorMatrix s,
+    ColorMatrix h
+) attribute_hidden;
+
+#endif /* COLOR_MATRIX_H */