From b9cc33c6ecb9d2689b1c3381c6061455cad862f0 Mon Sep 17 00:00:00 2001 From: Andreas Eversberg Date: Sun, 12 May 2019 09:36:12 +0200 Subject: OsmoTV: Added more test patterns for TV repair - improved FUBK - red screen for DY adjustment - crosses and dots for convergence adjustment - EBU color bars - natural color image --- src/tv/color.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 src/tv/color.c (limited to 'src/tv/color.c') diff --git a/src/tv/color.c b/src/tv/color.c new file mode 100644 index 0000000..75be71b --- /dev/null +++ b/src/tv/color.c @@ -0,0 +1,73 @@ +/* color test image generator + * + * (C) 2019 by Andreas Eversberg + * All Rights Reserved + * + * 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 3 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, see . + */ + +#include +#include +#include +#include "../libsample/sample.h" +#include "color.h" + +#define RAMP_WIDTH 0.0000002 + +static struct color_bar { + double amplitude, phase; +} color_bar[8] = { + {0.0, 0.0}, + {0.336, 167.1}, + {0.474, 283.5}, + {0.443, 240.7}, + {0.443, 60.7}, + {0.474, 103.5}, + {0.336, 347.1}, + {0.0, 0.0}, +}; + +int color_gen_line(sample_t *sample, double x, double samplerate, sample_t *color_u, sample_t *color_v, int v_polarity, double line_start, double line_end) +{ + int b = 5; + double step = 1.0 / samplerate; + int i = 0; + double amplitude, Y, U, V, colorphase; + + /* skip x to line_start */ + while (x < line_start && x < line_end) { + i++; + x += step; + } + if (x >= line_end) + return i; + + /* color */ + Y = (1.0 - (double)b / 7.0) * 0.75; + amplitude = color_bar[b].amplitude; + if (v_polarity < 0) + colorphase = (360.0 - color_bar[b].phase) / 180.0 * M_PI; + else + colorphase = color_bar[b].phase / 180.0 * M_PI; + U = cos(colorphase) * amplitude / 2.0; + V = sin(colorphase) * amplitude / 2.0; + while (x < line_end) { + color_u[i] = U; + color_v[i] = V; + sample[i++] = Y; + x += step; + } + + return i; +} -- cgit v1.2.3