diff options
Diffstat (limited to 'gst/videomixer/gstcms.c')
| -rwxr-xr-x | gst/videomixer/gstcms.c | 577 |
1 files changed, 577 insertions, 0 deletions
diff --git a/gst/videomixer/gstcms.c b/gst/videomixer/gstcms.c new file mode 100755 index 0000000..c46bd56 --- /dev/null +++ b/gst/videomixer/gstcms.c @@ -0,0 +1,577 @@ +/* GStreamer + * Copyright (C) 2008 David Schleef <ds@entropywave.com> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library 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 + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, + * Boston, MA 02110-1301, USA. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <gst/gst.h> +#include <gst/math-compat.h> +#include "gstcms.h" + +#include <stdio.h> +#include <string.h> +#include <math.h> + + +/* our simple CMS */ + +void +videomixer_color_xyY_to_XYZ (Color * c) +{ + if (c->v[1] == 0) { + c->v[0] = 0; + c->v[1] = 0; + c->v[2] = 0; + } else { + double X, Y, Z; + X = c->v[0] * c->v[2] / c->v[1]; + Y = c->v[2]; + Z = (1.0 - c->v[0] - c->v[1]) * c->v[2] / c->v[1]; + c->v[0] = X; + c->v[1] = Y; + c->v[2] = Z; + } +} + +void +videomixer_color_XYZ_to_xyY (Color * c) +{ + double d; + d = c->v[0] + c->v[1] + c->v[2]; + if (d == 0) { + c->v[0] = 0.3128; + c->v[1] = 0.3290; + c->v[2] = 0; + } else { + double x, y, Y; + x = c->v[0] / d; + y = c->v[1] / d; + Y = c->v[1]; + c->v[0] = x; + c->v[1] = y; + c->v[2] = Y; + } +} + +void +videomixer_color_set (Color * c, double x, double y, double z) +{ + c->v[0] = x; + c->v[1] = y; + c->v[2] = z; +} + +void +videomixer_color_matrix_set_identity (ColorMatrix * m) +{ + int i, j; + + for (i = 0; i < 4; i++) { + for (j = 0; j < 4; j++) { + m->m[i][j] = (i == j); + } + } +} + +/* Prettyprint a 4x4 matrix @m@ */ +void +videomixer_color_matrix_dump (ColorMatrix * m) +{ + int i, j; + + printf ("[\n"); + for (i = 0; i < 4; i++) { + printf (" "); + for (j = 0; j < 4; j++) { + printf (" %8.5g", m->m[i][j]); + } + printf ("\n"); + } + printf ("]\n"); +} + +/* Perform 4x4 matrix multiplication: + * - @dst@ = @a@ * @b@ + * - @dst@ may be a pointer to @a@ andor @b@ + */ +void +videomixer_color_matrix_multiply (ColorMatrix * dst, ColorMatrix * a, + ColorMatrix * b) +{ + ColorMatrix tmp; + int i, j, k; + + for (i = 0; i < 4; i++) { + for (j = 0; j < 4; j++) { + double x = 0; + for (k = 0; k < 4; k++) { + x += a->m[i][k] * b->m[k][j]; + } + tmp.m[i][j] = x; + } + } + + memcpy (dst, &tmp, sizeof (ColorMatrix)); +} + +void +videomixer_color_matrix_apply (ColorMatrix * m, Color * dest, Color * src) +{ + int i; + Color tmp; + + for (i = 0; i < 3; i++) { + double x = 0; + x += m->m[i][0] * src->v[0]; + x += m->m[i][1] * src->v[1]; + x += m->m[i][2] * src->v[2]; + x += m->m[i][3]; + tmp.v[i] = x; + } + memcpy (dest, &tmp, sizeof (tmp)); +} + +void +videomixer_color_matrix_offset_components (ColorMatrix * m, double a1, + double a2, double a3) +{ + ColorMatrix a; + + videomixer_color_matrix_set_identity (&a); + a.m[0][3] = a1; + a.m[1][3] = a2; + a.m[2][3] = a3; + videomixer_color_matrix_multiply (m, &a, m); +} + +void +videomixer_color_matrix_scale_components (ColorMatrix * m, double a1, double a2, + double a3) +{ + ColorMatrix a; + + videomixer_color_matrix_set_identity (&a); + a.m[0][0] = a1; + a.m[1][1] = a2; + a.m[2][2] = a3; + videomixer_color_matrix_multiply (m, &a, m); +} + +void +videomixer_color_matrix_YCbCr_to_RGB (ColorMatrix * m, double Kr, double Kb) +{ + double Kg = 1.0 - Kr - Kb; + ColorMatrix k = { + { + {1., 0., 2 * (1 - Kr), 0.}, + {1., -2 * Kb * (1 - Kb) / Kg, -2 * Kr * (1 - Kr) / Kg, 0.}, + {1., 2 * (1 - Kb), 0., 0.}, + {0., 0., 0., 1.}, + } + }; + + videomixer_color_matrix_multiply (m, &k, m); +} + +void +videomixer_color_matrix_RGB_to_YCbCr (ColorMatrix * m, double Kr, double Kb) +{ + double Kg = 1.0 - Kr - Kb; + ColorMatrix k; + double x; + + k.m[0][0] = Kr; + k.m[0][1] = Kg; + k.m[0][2] = Kb; + k.m[0][3] = 0; + + x = 1 / (2 * (1 - Kb)); + k.m[1][0] = -x * Kr; + k.m[1][1] = -x * Kg; + k.m[1][2] = x * (1 - Kb); + k.m[1][3] = 0; + + x = 1 / (2 * (1 - Kr)); + k.m[2][0] = x * (1 - Kr); + k.m[2][1] = -x * Kg; + k.m[2][2] = -x * Kb; + k.m[2][3] = 0; + + k.m[3][0] = 0; + k.m[3][1] = 0; + k.m[3][2] = 0; + k.m[3][3] = 1; + + videomixer_color_matrix_multiply (m, &k, m); +} + +void +videomixer_color_matrix_build_yuv_to_rgb_601 (ColorMatrix * dst) +{ + /* + * At this point, everything is in YCbCr + * All components are in the range [0,255] + */ + videomixer_color_matrix_set_identity (dst); + + /* offset required to get input video black to (0.,0.,0.) */ + videomixer_color_matrix_offset_components (dst, -16, -128, -128); + + /* scale required to get input video black to (0.,0.,0.) */ + videomixer_color_matrix_scale_components (dst, (1 / 219.0), (1 / 224.0), + (1 / 224.0)); + + /* colour matrix, YCbCr -> RGB */ + /* Requires Y in [0,1.0], Cb&Cr in [-0.5,0.5] */ + videomixer_color_matrix_YCbCr_to_RGB (dst, 0.2990, 0.1140); /* SD */ + + /* + * We are now in RGB space + */ + +#if 0 + /* scale to output range. */ + videomixer_color_matrix_scale_components (dst, 255.0, 255.0, 255.0); +#endif +} + +void +videomixer_color_matrix_build_bt709_to_bt601 (ColorMatrix * dst) +{ + videomixer_color_matrix_set_identity (dst); + + /* offset required to get input video black to (0.,0.,0.) */ + videomixer_color_matrix_offset_components (dst, -16, -128, -128); + + /* scale required to get input video black to (0.,0.,0.) */ + videomixer_color_matrix_scale_components (dst, (1 / 219.0), (1 / 224.0), + (1 / 224.0)); + + /* colour matrix, YCbCr -> RGB */ + /* Requires Y in [0,1.0], Cb&Cr in [-0.5,0.5] */ + videomixer_color_matrix_YCbCr_to_RGB (dst, 0.2126, 0.0722); /* HD */ + + videomixer_color_matrix_RGB_to_YCbCr (dst, 0.2990, 0.1140); /* SD */ + + videomixer_color_matrix_scale_components (dst, 219.0, 224.0, 224.0); + + videomixer_color_matrix_offset_components (dst, 16, 128, 128); +} + +void +videomixer_color_matrix_build_rgb_to_yuv_601 (ColorMatrix * dst) +{ + videomixer_color_matrix_set_identity (dst); + + videomixer_color_matrix_RGB_to_YCbCr (dst, 0.2990, 0.1140); /* SD */ + + videomixer_color_matrix_scale_components (dst, 219.0, 224.0, 224.0); + + videomixer_color_matrix_offset_components (dst, 16, 128, 128); + + { + Color c; + int i; + for (i = 7; i >= 0; i--) { + videomixer_color_set (&c, (i & 2) ? 0.75 : 0.0, (i & 4) ? 0.75 : 0.0, + (i & 1) ? 0.75 : 0.0); + videomixer_color_matrix_apply (dst, &c, &c); + g_print (" { %g, %g, %g },\n", rint (c.v[0]), rint (c.v[1]), + rint (c.v[2])); + } + videomixer_color_set (&c, -0.075, -0.075, -0.075); + videomixer_color_matrix_apply (dst, &c, &c); + g_print (" { %g, %g, %g },\n", rint (c.v[0]), rint (c.v[1]), + rint (c.v[2])); + videomixer_color_set (&c, 0.075, 0.075, 0.075); + videomixer_color_matrix_apply (dst, &c, &c); + g_print (" { %g, %g, %g },\n", rint (c.v[0]), rint (c.v[1]), + rint (c.v[2])); + } +} + +void +videomixer_color_matrix_invert (ColorMatrix * m) +{ + ColorMatrix tmp; + int i, j; + double det; + + videomixer_color_matrix_set_identity (&tmp); + for (j = 0; j < 3; j++) { + for (i = 0; i < 3; i++) { + tmp.m[j][i] = + m->m[(i + 1) % 3][(j + 1) % 3] * m->m[(i + 2) % 3][(j + 2) % 3] - + m->m[(i + 1) % 3][(j + 2) % 3] * m->m[(i + 2) % 3][(j + 1) % 3]; + } + } + det = + tmp.m[0][0] * m->m[0][0] + tmp.m[0][1] * m->m[1][0] + + tmp.m[0][2] * m->m[2][0]; + for (j = 0; j < 3; j++) { + for (i = 0; i < 3; i++) { + tmp.m[i][j] /= det; + } + } + memcpy (m, &tmp, sizeof (tmp)); +} + +void +videomixer_color_matrix_copy (ColorMatrix * dest, ColorMatrix * src) +{ + memcpy (dest, src, sizeof (ColorMatrix)); +} + +void +videomixer_color_matrix_transpose (ColorMatrix * m) +{ + int i, j; + ColorMatrix tmp; + + videomixer_color_matrix_set_identity (&tmp); + for (i = 0; i < 3; i++) { + for (j = 0; j < 3; j++) { + tmp.m[i][j] = m->m[j][i]; + } + } + memcpy (m, &tmp, sizeof (ColorMatrix)); +} + +void +videomixer_color_matrix_build_XYZ (ColorMatrix * dst, + double rx, double ry, + double gx, double gy, double bx, double by, double wx, double wy) +{ + Color r, g, b, w, scale; + ColorMatrix m; + + videomixer_color_set (&r, rx, ry, 1.0); + videomixer_color_xyY_to_XYZ (&r); + videomixer_color_set (&g, gx, gy, 1.0); + videomixer_color_xyY_to_XYZ (&g); + videomixer_color_set (&b, bx, by, 1.0); + videomixer_color_xyY_to_XYZ (&b); + videomixer_color_set (&w, wx, wy, 1.0); + videomixer_color_xyY_to_XYZ (&w); + + videomixer_color_matrix_set_identity (dst); + + dst->m[0][0] = r.v[0]; + dst->m[0][1] = r.v[1]; + dst->m[0][2] = r.v[2]; + dst->m[1][0] = g.v[0]; + dst->m[1][1] = g.v[1]; + dst->m[1][2] = g.v[2]; + dst->m[2][0] = b.v[0]; + dst->m[2][1] = b.v[1]; + dst->m[2][2] = b.v[2]; + + videomixer_color_matrix_dump (dst); + videomixer_color_matrix_copy (&m, dst); + videomixer_color_matrix_invert (&m); + videomixer_color_matrix_dump (&m); + + videomixer_color_matrix_transpose (&m); + videomixer_color_matrix_apply (&m, &scale, &w); + g_print ("%g %g %g\n", scale.v[0], scale.v[1], scale.v[2]); + + dst->m[0][0] = r.v[0] * scale.v[0]; + dst->m[0][1] = r.v[1] * scale.v[0]; + dst->m[0][2] = r.v[2] * scale.v[0]; + dst->m[1][0] = g.v[0] * scale.v[1]; + dst->m[1][1] = g.v[1] * scale.v[1]; + dst->m[1][2] = g.v[2] * scale.v[1]; + dst->m[2][0] = b.v[0] * scale.v[2]; + dst->m[2][1] = b.v[1] * scale.v[2]; + dst->m[2][2] = b.v[2] * scale.v[2]; + + videomixer_color_matrix_transpose (dst); + videomixer_color_matrix_dump (dst); + + videomixer_color_set (&scale, 1, 1, 1); + videomixer_color_matrix_apply (dst, &scale, &scale); + videomixer_color_XYZ_to_xyY (&scale); + g_print ("white %g %g %g\n", scale.v[0], scale.v[1], scale.v[2]); + +} + +void +videomixer_color_matrix_build_rgb_to_XYZ_601 (ColorMatrix * dst) +{ + /* SMPTE C primaries, SMPTE 170M-2004 */ + videomixer_color_matrix_build_XYZ (dst, + 0.630, 0.340, 0.310, 0.595, 0.155, 0.070, 0.3127, 0.3290); +#if 0 + /* NTSC 1953 primaries, SMPTE 170M-2004 */ + videomixer_color_matrix_build_XYZ (dst, + 0.67, 0.33, 0.21, 0.71, 0.14, 0.08, 0.3127, 0.3290); +#endif +} + +void +videomixer_color_matrix_build_XYZ_to_rgb_709 (ColorMatrix * dst) +{ + /* Rec. ITU-R BT.709-5 */ + videomixer_color_matrix_build_XYZ (dst, + 0.640, 0.330, 0.300, 0.600, 0.150, 0.060, 0.3127, 0.3290); +} + +void +videomixer_color_matrix_build_XYZ_to_rgb_dell (ColorMatrix * dst) +{ + /* Dell monitor */ +#if 1 + videomixer_color_matrix_build_XYZ (dst, + 0.662, 0.329, 0.205, 0.683, 0.146, 0.077, 0.3135, 0.3290); +#endif +#if 0 + videomixer_color_matrix_build_XYZ (dst, + 0.630, 0.340, 0.310, 0.595, 0.155, 0.070, 0.3127, 0.3290); +#endif + videomixer_color_matrix_invert (dst); +} + +void +videomixer_color_transfer_function_apply (Color * dest, Color * src) +{ + int i; + + for (i = 0; i < 3; i++) { + if (src->v[i] < 0.0812) { + dest->v[i] = src->v[i] / 4.500; + } else { + dest->v[i] = pow (src->v[i] + 0.099, 1 / 0.4500); + } + } +} + +void +videomixer_color_transfer_function_unapply (Color * dest, Color * src) +{ + int i; + + for (i = 0; i < 3; i++) { + if (src->v[i] < 0.0812 / 4.500) { + dest->v[i] = src->v[i] * 4.500; + } else { + dest->v[i] = pow (src->v[i], 0.4500) - 0.099; + } + } +} + +void +videomixer_color_gamut_clamp (Color * dest, Color * src) +{ + dest->v[0] = CLAMP (src->v[0], 0.0, 1.0); + dest->v[1] = CLAMP (src->v[1], 0.0, 1.0); + dest->v[2] = CLAMP (src->v[2], 0.0, 1.0); +} + +#if 0 +static guint8 * +get_color_transform_table (void) +{ + static guint8 *color_transform_table = NULL; + +#if 1 + if (!color_transform_table) { + ColorMatrix bt601_to_rgb; + ColorMatrix bt601_to_yuv; + ColorMatrix bt601_rgb_to_XYZ; + ColorMatrix dell_XYZ_to_rgb; + guint8 *table_y; + guint8 *table_u; + guint8 *table_v; + int y, u, v; + + videomixer_color_matrix_build_yuv_to_rgb_601 (&bt601_to_rgb); + videomixer_color_matrix_build_rgb_to_yuv_601 (&bt601_to_yuv); + videomixer_color_matrix_build_rgb_to_XYZ_601 (&bt601_rgb_to_XYZ); + videomixer_color_matrix_build_XYZ_to_rgb_dell (&dell_XYZ_to_rgb); + + color_transform_table = g_malloc (0x1000000 * 3); + + table_y = COG_OFFSET (color_transform_table, 0 * 0x1000000); + table_u = COG_OFFSET (color_transform_table, 1 * 0x1000000); + table_v = COG_OFFSET (color_transform_table, 2 * 0x1000000); + + for (y = 0; y < 256; y++) { + for (u = 0; u < 256; u++) { + for (v = 0; v < 256; v++) { + Color c; + + c.v[0] = y; + c.v[1] = u; + c.v[2] = v; + videomixer_color_matrix_apply (&bt601_to_rgb, &c, &c); + color_gamut_clamp (&c, &c); + color_transfer_function_apply (&c, &c); + videomixer_color_matrix_apply (&bt601_rgb_to_XYZ, &c, &c); + videomixer_color_matrix_apply (&dell_XYZ_to_rgb, &c, &c); + color_transfer_function_unapply (&c, &c); + color_gamut_clamp (&c, &c); + videomixer_color_matrix_apply (&bt601_to_yuv, &c, &c); + + table_y[(y << 16) | (u << 8) | (v)] = rint (c.v[0]); + table_u[(y << 16) | (u << 8) | (v)] = rint (c.v[1]); + table_v[(y << 16) | (u << 8) | (v)] = rint (c.v[2]); + } + } + } + } +#endif +#if 0 + if (!color_transform_table) { + ColorMatrix bt709_to_bt601; + guint8 *table_y; + guint8 *table_u; + guint8 *table_v; + int y, u, v; + + videomixer_color_matrix_build_bt709_to_bt601 (&bt709_to_bt601); + + color_transform_table = g_malloc (0x1000000 * 3); + + table_y = COG_OFFSET (color_transform_table, 0 * 0x1000000); + table_u = COG_OFFSET (color_transform_table, 1 * 0x1000000); + table_v = COG_OFFSET (color_transform_table, 2 * 0x1000000); + + for (y = 0; y < 256; y++) { + for (u = 0; u < 256; u++) { + for (v = 0; v < 256; v++) { + Color c; + + c.v[0] = y; + c.v[1] = u; + c.v[2] = v; + videomixer_color_matrix_apply (&bt709_to_bt601, &c, &c); + + table_y[(y << 16) | (u << 8) | (v)] = rint (c.v[0]); + table_u[(y << 16) | (u << 8) | (v)] = rint (c.v[1]); + table_v[(y << 16) | (u << 8) | (v)] = rint (c.v[2]); + } + } + } + } +#endif + + return color_transform_table; +} +#endif |