1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef LB2_SAMPLE_H_ 18 #define LB2_SAMPLE_H_ 19 20 #include <cmath> 21 #include <limits> 22 23 using sample_t = int16_t; // For flexibility. May change to a float type if needed. 24 25 static_assert(std::is_integral<sample_t>::value, 26 "FULL_SAMPLE_SCALE assumes sample values are of integer type"); 27 // FIXME: Would we plan to use floats, the maximum value will be 1.0. 28 constexpr double FULL_SAMPLE_SCALE = std::numeric_limits<sample_t>::max() + 1; 29 convertSampleType(sample_t s)30inline double convertSampleType(sample_t s) { 31 static_assert(std::numeric_limits<sample_t>::is_signed, "sample value is assumed to be signed"); 32 return s / FULL_SAMPLE_SCALE; 33 } 34 convertSampleType(double d)35inline sample_t convertSampleType(double d) { 36 return std::trunc(d * FULL_SAMPLE_SCALE); 37 } 38 39 #endif // LB2_SAMPLE_H_ 40