| /* |
| * Copyright (C) 2017 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 LB2_SAMPLE_H_ |
| #define LB2_SAMPLE_H_ |
| |
| #include <cmath> |
| #include <limits> |
| |
| using sample_t = int16_t; // For flexibility. May change to a float type if needed. |
| |
| static_assert(std::is_integral<sample_t>::value, |
| "FULL_SAMPLE_SCALE assumes sample values are of integer type"); |
| // FIXME: Would we plan to use floats, the maximum value will be 1.0. |
| constexpr double FULL_SAMPLE_SCALE = std::numeric_limits<sample_t>::max() + 1; |
| |
| inline double convertSampleType(sample_t s) { |
| static_assert(std::numeric_limits<sample_t>::is_signed, "sample value is assumed to be signed"); |
| return s / FULL_SAMPLE_SCALE; |
| } |
| |
| inline sample_t convertSampleType(double d) { |
| return std::trunc(d * FULL_SAMPLE_SCALE); |
| } |
| |
| #endif // LB2_SAMPLE_H_ |