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-rw-r--r--src/tv/ebu.c76
1 files changed, 76 insertions, 0 deletions
diff --git a/src/tv/ebu.c b/src/tv/ebu.c
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+/* color test image generator
+ *
+ * (C) 2019 by Andreas Eversberg <jolly@eversberg.eu>
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+#include <math.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include "../libsample/sample.h"
+#include "ebu.h"
+
+#define RAMP_WIDTH 0.0000002
+
+static struct color_bar {
+ double luminance, amplitude, phase;
+} color_bar[8] = {
+ {1.0, 0.0, 0.0},
+ {0.664, 0.336, 167.1},
+ {0.526, 0.474, 283.5},
+ {0.440, 0.443, 240.7},
+ {0.310, 0.443, 60.7},
+ {0.224, 0.474, 103.5},
+ {0.086, 0.336, 347.1},
+ {0.0, 0.0, 0.0},
+};
+
+int ebu_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, render_end;
+ 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 */
+ for (b = 0; b < 8; b++) {
+ Y = color_bar[b].luminance;
+ 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;
+ render_end = (line_end - line_start) / 8 * (b + 1) + line_start;
+ while (x < render_end) {
+ color_u[i] = U;
+ color_v[i] = V;
+ sample[i++] = Y;
+ x += step;
+ }
+ }
+
+ return i;
+}