| /* |
| * Copyright (C) 2016 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 ANDROID_AUDIO_LIMITER_H |
| #define ANDROID_AUDIO_LIMITER_H |
| |
| #include <sys/cdefs.h> |
| |
| /** \cond */ |
| __BEGIN_DECLS |
| /** \endcond */ |
| |
| /** |
| * This limiter function is the identity for [-sqrt(0.5), sqrt(0.5)] |
| * and then approximates atan or spline. |
| * \param in input in range [-sqrt(2), sqrt(2)]; out of range, inf, and NaN are not permitted |
| * \return the limited output in range no larger than [-1.0, 1.0]. |
| * The implementation is permitted to limit the output to a slightly smaller range, |
| * so the minimum and maximum outputs may not be achievable. |
| */ |
| float limiter(float in); |
| |
| /** \cond */ |
| __END_DECLS |
| /** \endcond */ |
| |
| #endif /* !ANDROID_AUDIO_LIMITER_H */ |
