add license headers

util/audio_math.h

@@ -1,8 +1,32 @@
+/*
+ * audio_math.h
+ * Copyright (c) 2025 Christopher Herb
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
 #pragma once
 
 #include <math.h>
 
 namespace trnr {
+
 inline double lin_2_db(double lin)
 {
 	if (lin <= 1e-20) lin = 1e-20; // avoid log(0)
@@ -11,7 +35,13 @@ inline double lin_2_db(double lin)
 
 inline double db_2_lin(double db) { return pow(10.0, db / 20.0); }
 
-inline float midi_to_frequency(float midi_note) { return 440.0 * powf(2.0, ((float)midi_note - 69.0) / 12.0); }
+inline float midi_to_frequency(float midi_note)
+{
+	return 440.0 * powf(2.0, ((float)midi_note - 69.0) / 12.0);
+}
 
-inline float ms_to_samples(float ms, double sample_rate) { return (ms * 0.001f) * (float)sample_rate; }
-} // namespace trnr
+inline float ms_to_samples(float ms, double sample_rate)
+{
+	return (ms * 0.001f) * (float)sample_rate;
+}
+} // namespace trnr