services/oboeservice/AAudioEndpointManager.h

   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_AAUDIO_ENDPOINT_MANAGER_H
  18 #define AAUDIO_AAUDIO_ENDPOINT_MANAGER_H
  19
  20 #include <map>
  21 #include <mutex>
  22 #include <utils/Singleton.h>
  23
  24 #include "binding/AAudioServiceMessage.h"
  25 #include "AAudioServiceEndpoint.h"
  26 #include "AAudioServiceEndpointCapture.h"
  27 #include "AAudioServiceEndpointMMAP.h"
  28 #include "AAudioServiceEndpointPlay.h"
  29
  30 namespace aaudio {
  31
  32 class AAudioEndpointManager : public android::Singleton<AAudioEndpointManager> {
  33 public:
  34     AAudioEndpointManager();
  35     ~AAudioEndpointManager() = default;
  36
  37     /**
  38      * Returns information about the state of the this class.
  39      *
  40      * Will attempt to get the object lock, but will proceed
  41      * even if it cannot.
  42      *
  43      * Each line of information ends with a newline.
  44      *
  45      * @return a string with useful information
  46      */
  47     std::string dump() const;
  48
  49     /**
  50      * Find a service endpoint for the given deviceId and direction.
  51      * If an endpoint does not already exist then try to create one.
  52      *
  53      * @param audioService
  54      * @param request
  55      * @param sharingMode
  56      * @return endpoint or null
  57      */
  58     android::sp<AAudioServiceEndpoint> openEndpoint(android::AAudioService &audioService,
  59                                         const aaudio::AAudioStreamRequest &request,
  60                                         aaudio_sharing_mode_t sharingMode);
  61
  62     void closeEndpoint(android::sp<AAudioServiceEndpoint> serviceEndpoint);
  63
  64 private:
  65     android::sp<AAudioServiceEndpoint> openExclusiveEndpoint(android::AAudioService &aaudioService,
  66                                                  const aaudio::AAudioStreamRequest &request);
  67
  68     android::sp<AAudioServiceEndpoint> openSharedEndpoint(android::AAudioService &aaudioService,
  69                                               const aaudio::AAudioStreamRequest &request);
  70
  71     android::sp<AAudioServiceEndpoint> findExclusiveEndpoint_l(
  72             const AAudioStreamConfiguration& configuration);
  73
  74     android::sp<AAudioServiceEndpointShared> findSharedEndpoint_l(
  75             const AAudioStreamConfiguration& configuration);
  76
  77     void closeExclusiveEndpoint(android::sp<AAudioServiceEndpoint> serviceEndpoint);
  78     void closeSharedEndpoint(android::sp<AAudioServiceEndpoint> serviceEndpoint);
  79
  80     // Use separate locks because opening a Shared endpoint requires opening an Exclusive one.
  81     // That could cause a recursive lock.
  82     // Lock mSharedLock before mExclusiveLock.
  83     // it is OK to only lock mExclusiveLock.
  84     mutable std::mutex                                     mSharedLock;
  85     std::vector<android::sp<AAudioServiceEndpointShared>>  mSharedStreams;
  86
  87     mutable std::mutex                                     mExclusiveLock;
  88     std::vector<android::sp<AAudioServiceEndpointMMAP>>    mExclusiveStreams;
  89
  90 };
  91
  92 } /* namespace aaudio */
  93
  94 #endif //AAUDIO_AAUDIO_ENDPOINT_MANAGER_H