AAudioServiceEndpoint.h revision c8f69a08a409fd163873d725c63f8d60259ae21d 
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_H
18#define AAUDIO_SERVICE_ENDPOINT_H
19
20#include <atomic>
21#include <functional>
22#include <mutex>
23#include <vector>
24
25#include "client/AudioStreamInternal.h"
26#include "binding/AAudioServiceMessage.h"
27#include "AAudioServiceStreamShared.h"
28#include "AAudioServiceStreamMMAP.h"
29#include "AAudioMixer.h"
30#include "AAudioService.h"
31
32namespace aaudio {
33
34class AAudioServiceEndpoint {
35public:
36    explicit AAudioServiceEndpoint(android::AAudioService &audioService);
37    virtual ~AAudioServiceEndpoint();
38
39    aaudio_result_t open(int32_t deviceId, aaudio_direction_t direction);
40
41    int32_t getSampleRate() const { return mStreamInternal.getSampleRate(); }
42    int32_t getSamplesPerFrame() const { return mStreamInternal.getSamplesPerFrame();  }
43    int32_t getFramesPerBurst() const { return mStreamInternal.getFramesPerBurst();  }
44
45    aaudio_result_t registerStream(AAudioServiceStreamShared *sharedStream);
46    aaudio_result_t unregisterStream(AAudioServiceStreamShared *sharedStream);
47    aaudio_result_t startStream(AAudioServiceStreamShared *sharedStream);
48    aaudio_result_t stopStream(AAudioServiceStreamShared *sharedStream);
49    aaudio_result_t close();
50
51    int32_t getDeviceId() const { return mStreamInternal.getDeviceId(); }
52
53    aaudio_direction_t getDirection() const { return mStreamInternal.getDirection(); }
54
55    void disconnectRegisteredStreams();
56
57    void *callbackLoop();
58
59    // This should only be called from the AAudioEndpointManager under a mutex.
60    int32_t getReferenceCount() const {
61        return mReferenceCount;
62    }
63
64    // This should only be called from the AAudioEndpointManager under a mutex.
65    void setReferenceCount(int32_t count) {
66        mReferenceCount = count;
67    }
68
69private:
70    aaudio_result_t startMixer_l();
71    aaudio_result_t stopMixer_l();
72
73    int64_t calculateReasonableTimeout(int32_t framesPerOperation);
74
75    AudioStreamInternal      mStreamInternal;
76    AAudioMixer              mMixer;
77
78    std::atomic<bool>        mCallbackEnabled;
79    int32_t                  mReferenceCount = 0;
80    bool                     mLatencyTuningEnabled = false; // TODO implement tuning
81
82    std::mutex               mLockStreams;
83    std::vector<AAudioServiceStreamShared *> mRegisteredStreams;
84    std::vector<AAudioServiceStreamShared *> mRunningStreams;
85
86};
87
88} /* namespace aaudio */
89
90
91#endif //AAUDIO_SERVICE_ENDPOINT_H
92