1 /*
2  * Copyright (C) 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 AAUDIO_SERVICE_ENDPOINT_SHARED_H
18 #define AAUDIO_SERVICE_ENDPOINT_SHARED_H
19 
20 #include <atomic>
21 #include <mutex>
22 
23 #include "AAudioServiceEndpoint.h"
24 #include "client/AudioStreamInternal.h"
25 #include "client/AudioStreamInternalPlay.h"
26 #include "AAudioServiceStreamShared.h"
27 #include "AAudioServiceStreamMMAP.h"
28 #include "AAudioService.h"
29 
30 namespace aaudio {
31 
32 /**
33  * This manages an AudioStreamInternal that is shared by multiple Client streams.
34  */
35 class AAudioServiceEndpointShared : public AAudioServiceEndpoint {
36 
37 public:
38 
39     std::string dump() const override;
40 
41     aaudio_result_t open(const aaudio::AAudioStreamRequest &request) override;
42 
43     aaudio_result_t close() override;
44 
45     aaudio_result_t startStream(android::sp<AAudioServiceStreamBase> stream,
46                                 audio_port_handle_t *clientHandle) override;
47 
48     aaudio_result_t stopStream(android::sp<AAudioServiceStreamBase> stream,
49                                audio_port_handle_t clientHandle) override;
50 
51     aaudio_result_t getFreeRunningPosition(int64_t *positionFrames, int64_t *timeNanos) override;
52 
53     aaudio_result_t getTimestamp(int64_t *positionFrames, int64_t *timeNanos) override;
54 
55     virtual void   *callbackLoop() = 0;
56 
57 protected:
58 
getStreamInternal()59     AudioStreamInternal *getStreamInternal() const {
60         return mStreamInternal;
61     };
62 
63     aaudio_result_t          startSharingThread_l();
64 
65     aaudio_result_t          stopSharingThread();
66 
67     // pointer to object statically allocated in subclasses
68     AudioStreamInternal     *mStreamInternal = nullptr;
69 
70     std::atomic<bool>        mCallbackEnabled{false};
71 
72     std::atomic<int>         mRunningStreamCount{0};
73 };
74 
75 }
76 
77 #endif //AAUDIO_SERVICE_ENDPOINT_SHARED_H
78