removed reliance on Qt multimedia

2021-10-01 16:12:12 -07:00
parent 12a0c3a977
commit fbc5997d32
13 changed files with 111 additions and 95 deletions
@@ -0,0 +1,89 @@
+/***
+
+  Olive - Non-Linear Video Editor
+  Copyright (C) 2021 Olive Team
+
+  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/>.
+
+***/
+
+#ifndef DECIBEL_H
+#define DECIBEL_H
+
+#include <QtGlobal>
+#include <cmath>
+
+namespace olive {
+
+class Decibel
+{
+public:
+  static double fromLinear(double linear)
+  {
+    return double(20.0) * std::log10(linear);
+  }
+
+  static double toLinear(double decibel)
+  {
+    double to_linear = std::pow(double(10.0), decibel / double(20.0));
+
+    // Minimum threshold that we figure is close enough to 0 that we may as well just return 0
+    if (to_linear < 0.000001) {
+      return 0;
+    } else {
+      return to_linear;
+    }
+  }
+
+  static double fromLogarithmic(double logarithmic)
+  {
+    if (logarithmic < 0.001)
+      return -200.0;
+    else if (logarithmic > 0.99)
+      return 0;
+    else
+      return 20.0 * std::log10(-std::log(1 - logarithmic) / LOG100);
+  }
+
+  static double toLogarithmic(double decibel)
+  {
+    if (qFuzzyIsNull(decibel)) {
+      return 1;
+    } else {
+      return 1 - std::exp(-std::pow(10.0, decibel / 20.0) * LOG100);
+    }
+  }
+
+  static double LinearToLogarithmic(double linear)
+  {
+    return 1 - std::exp(-linear * LOG100);
+  }
+
+  static double LogarithmicToLinear(double logarithmic)
+  {
+    if (logarithmic > 0.99) {
+      return 1;
+    } else {
+      return -std::log(1 - logarithmic) / LOG100;
+    }
+  }
+
+private:
+  static constexpr double LOG100 = 4.60517018599;
+
+};
+
+}
+
+#endif // DECIBEL_H