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_OUTPUT_MIXER_OPENSLES_H
18 #define OBOE_OUTPUT_MIXER_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 
32 class OutputMixerOpenSL {
33 public:
34     static OutputMixerOpenSL &getInstance();
35 
36     SLresult open();
37 
38     void close();
39 
40     SLresult createAudioPlayer(SLObjectItf *objectItf,
41                                SLDataSource *audioSource);
42 
43 private:
44     // Make this a safe Singleton
45     OutputMixerOpenSL()= default;
46     ~OutputMixerOpenSL()= default;
47     OutputMixerOpenSL(const OutputMixerOpenSL&)= delete;
48     OutputMixerOpenSL& operator=(const OutputMixerOpenSL&)= delete;
49 
50     std::mutex            mLock;
51     int32_t               mOpenCount = 0;
52 
53     SLObjectItf           mOutputMixObject = nullptr;
54 };
55 
56 } // namespace oboe
57 
58 #endif //OBOE_OUTPUT_MIXER_OPENSLES_H
59