1 /*
2  * Copyright 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 OBOE_ENGINE_OPENSLES_H
18 #define OBOE_ENGINE_OPENSLES_H
19 
20 #include <atomic>
21 #include <mutex>
22 
23 #include <SLES/OpenSLES.h>
24 #include <SLES/OpenSLES_Android.h>
25 
26 namespace oboe {
27 
28 /**
29  * INTERNAL USE ONLY
30  */
31 class EngineOpenSLES {
32 public:
33     static EngineOpenSLES &getInstance();
34 
35     SLresult open();
36 
37     void close();
38 
39     SLresult createOutputMix(SLObjectItf *objectItf);
40 
41     SLresult createAudioPlayer(SLObjectItf *objectItf,
42                                SLDataSource *audioSource,
43                                SLDataSink *audioSink);
44     SLresult createAudioRecorder(SLObjectItf *objectItf,
45                                  SLDataSource *audioSource,
46                                  SLDataSink *audioSink);
47 
48 private:
49     // Make this a safe Singleton
50     EngineOpenSLES()= default;
51     ~EngineOpenSLES()= default;
52     EngineOpenSLES(const EngineOpenSLES&)= delete;
53     EngineOpenSLES& operator=(const EngineOpenSLES&)= delete;
54 
55     std::mutex             mLock;
56     int32_t                mOpenCount = 0;
57 
58     SLObjectItf            mEngineObject = nullptr;
59     SLEngineItf            mEngineInterface = nullptr;
60 };
61 
62 } // namespace oboe
63 
64 
65 #endif //OBOE_ENGINE_OPENSLES_H
66