LoudnessEnhancer audio effect implementation

Implementation based on DRC effect, controlled by a
 target gain.
 The target gain is used to amplify the signal at
 the input of the DRC, and to compute the knee
 of the DRC.

Bug 8413913

Change-Id: I386d64793a9fa3f7218e053d6f0a99f6836c02bd

1 files changed, 48 insertions, 0 deletions

diff --git a/media/libeffects/loudness/dsp/core/basic-inl.h b/media/libeffects/loudness/dsp/core/basic-inl.h
new file mode 100644
index 0000000..3f77147
--- /dev/null
+++ b/media/libeffects/loudness/dsp/core/basic-inl.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LE_FX_ENGINE_DSP_CORE_BASIC_INL_H_
+#define LE_FX_ENGINE_DSP_CORE_BASIC_INL_H_
+
+#include <math.h>
+
+namespace le_fx {
+
+namespace sigmod {
+
+template <typename T>
+int SearchIndex(const T x_data[],
+                T x,
+                int start_index,
+                int end_index) {
+  int start = start_index;
+  int end = end_index;
+  while (end > start + 1) {
+    int i = (end + start) / 2;
+    if (x_data[i] > x) {
+      end = i;
+    } else {
+      start = i;
+    }
+  }
+  return start;
+}
+
+}  // namespace sigmod
+
+}  // namespace le_fx
+
+#endif  // LE_FX_ENGINE_DSP_CORE_BASIC_INL_H_