1 /*
2  * Copyright  2019 Google LLC
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  *     https://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 #ifndef ANDROID_FXLAB_GAINDESCRIPTION_H
17 #define ANDROID_FXLAB_GAINDESCRIPTION_H
18 #include "EffectDescription.h"
19 #include <cmath>
20 #include <iostream>
21 
22 namespace Effect {
23 class GainDescription : public EffectDescription<GainDescription, 1> {
24 public:
getName()25     static constexpr std::string_view getName() {
26         return std::string_view("Gain");
27     }
28 
getCategory()29     static constexpr std::string_view getCategory() {
30         return std::string_view("None");
31     }
32 
getParams()33     static constexpr std::array<ParamType, getNumParams()> getParams() {
34         return std::array <ParamType, getNumParams()> {
35                 ParamType("Gain", -30, 20, 0)
36         };
37     }
38 
39     template<class iter_type>
buildEffect(std::array<float,getNumParams ()> paramArr)40     static _ef<iter_type> buildEffect(std::array<float, getNumParams()> paramArr) {
41         float scale = paramArr[0] / 10;
42         return _ef<iter_type> {
43             [=](iter_type beg, iter_type end) {
44                 for (; beg != end; ++beg) *beg *= pow(2.0, scale);
45             }
46         };
47     }
48 };
49 } // namespace Effect
50 #endif //ANDROID_FXLAB_GAINDESCRIPTION_H
51