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 NATIVEOBOE_SAWPINGGENERATOR_H
18 #define NATIVEOBOE_SAWPINGGENERATOR_H
19 
20 #include <atomic>
21 #include <unistd.h>
22 #include <sys/types.h>
23 
24 #include "flowgraph/FlowGraphNode.h"
25 #include "flowunits/OscillatorBase.h"
26 
27 class SawPingGenerator : public OscillatorBase {
28 public:
29     SawPingGenerator();
30 
31     virtual ~SawPingGenerator();
32 
33     int32_t onProcess(int numFrames) override;
34 
35     void trigger();
36 
37     void reset() override;
38 
39 private:
40     std::atomic<int> mRequestCount; // external thread increments this to request a beep
41     std::atomic<int> mAcknowledgeCount; // audio thread sets this to acknowledge
42     double mLevel;
43 };
44 
45 
46 #endif //NATIVEOBOE_SAWPINGGENERATOR_H
47