1 /*
2  * Copyright 2015 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 FLOWGRAPH_CLIP_TO_RANGE_H
18 #define FLOWGRAPH_CLIP_TO_RANGE_H
19 
20 #include <atomic>
21 #include <unistd.h>
22 #include <sys/types.h>
23 
24 #include "AudioProcessorBase.h"
25 
26 namespace flowgraph {
27 
28 // This is 3 dB, (10^(3/20)), to match the maximum headroom in AudioTrack for float data.
29 // It is designed to allow occasional transient peaks.
30 constexpr float kDefaultMaxHeadroom = 1.41253754f;
31 constexpr float kDefaultMinHeadroom = -kDefaultMaxHeadroom;
32 
33 class ClipToRange : public AudioProcessorBase {
34 public:
35     explicit ClipToRange(int32_t channelCount);
36 
37     virtual ~ClipToRange() = default;
38 
39     int32_t onProcess(int64_t framePosition, int32_t numFrames) override;
40 
setMinimum(float min)41     void setMinimum(float min) {
42         mMinimum = min;
43     }
44 
getMinimum()45     float getMinimum() const {
46         return mMinimum;
47     }
48 
setMaximum(float min)49     void setMaximum(float min) {
50         mMaximum = min;
51     }
52 
getMaximum()53     float getMaximum() const {
54         return mMaximum;
55     }
56 
57     AudioFloatInputPort input;
58     AudioFloatOutputPort output;
59 
60 private:
61     float mMinimum = kDefaultMinHeadroom;
62     float mMaximum = kDefaultMaxHeadroom;
63 };
64 
65 } /* namespace flowgraph */
66 
67 #endif //FLOWGRAPH_CLIP_TO_RANGE_H
68