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-rw-r--r--media/ffvpx/libavutil/display.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/media/ffvpx/libavutil/display.c b/media/ffvpx/libavutil/display.c
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+++ b/media/ffvpx/libavutil/display.c
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+/*
+ * Copyright (c) 2014 Vittorio Giovara <vittorio.giovara@gmail.com>
+ *
+ * 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
+ */
+
+#include <stdint.h>
+#include <string.h>
+#include <math.h>
+
+#include "display.h"
+#include "mathematics.h"
+
+// fixed point to double
+#define CONV_FP(x) ((double) (x)) / (1 << 16)
+
+// double to fixed point
+#define CONV_DB(x) (int32_t) ((x) * (1 << 16))
+
+double av_display_rotation_get(const int32_t matrix[9])
+{
+ double rotation, scale[2];
+
+ scale[0] = hypot(CONV_FP(matrix[0]), CONV_FP(matrix[3]));
+ scale[1] = hypot(CONV_FP(matrix[1]), CONV_FP(matrix[4]));
+
+ if (scale[0] == 0.0 || scale[1] == 0.0)
+ return NAN;
+
+ rotation = atan2(CONV_FP(matrix[1]) / scale[1],
+ CONV_FP(matrix[0]) / scale[0]) * 180 / M_PI;
+
+ return -rotation;
+}
+
+void av_display_rotation_set(int32_t matrix[9], double angle)
+{
+ double radians = -angle * M_PI / 180.0f;
+ double c = cos(radians);
+ double s = sin(radians);
+
+ memset(matrix, 0, 9 * sizeof(int32_t));
+
+ matrix[0] = CONV_DB(c);
+ matrix[1] = CONV_DB(-s);
+ matrix[3] = CONV_DB(s);
+ matrix[4] = CONV_DB(c);
+ matrix[8] = 1 << 30;
+}
+
+void av_display_matrix_flip(int32_t matrix[9], int hflip, int vflip)
+{
+ int i;
+ const int flip[] = { 1 - 2 * (!!hflip), 1 - 2 * (!!vflip), 1 };
+
+ if (hflip || vflip)
+ for (i = 0; i < 9; i++)
+ matrix[i] *= flip[i % 3];
+}