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      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_MMAP_H
     18 #define AAUDIO_SERVICE_ENDPOINT_MMAP_H
     19 
     20 #include <atomic>
     21 #include <functional>
     22 #include <mutex>
     23 #include <vector>
     24 
     25 #include "client/AudioStreamInternal.h"
     26 #include "client/AudioStreamInternalPlay.h"
     27 #include "binding/AAudioServiceMessage.h"
     28 #include "AAudioServiceEndpointShared.h"
     29 #include "AAudioServiceStreamShared.h"
     30 #include "AAudioServiceStreamMMAP.h"
     31 #include "AAudioMixer.h"
     32 #include "AAudioService.h"
     33 
     34 namespace aaudio {
     35 
     36 /**
     37  * This is used by AAudioServiceStreamMMAP to access the MMAP devices
     38  * through AudioFlinger.
     39  */
     40 class AAudioServiceEndpointMMAP
     41         : public AAudioServiceEndpoint
     42         , public android::MmapStreamCallback {
     43 
     44 public:
     45     AAudioServiceEndpointMMAP();
     46 
     47     virtual ~AAudioServiceEndpointMMAP();
     48 
     49     std::string dump() const override;
     50 
     51     aaudio_result_t open(const aaudio::AAudioStreamRequest &request) override;
     52 
     53     aaudio_result_t close() override;
     54 
     55     aaudio_result_t startStream(android::sp<AAudioServiceStreamBase> stream,
     56                                 audio_port_handle_t *clientHandle) override;
     57 
     58     aaudio_result_t stopStream(android::sp<AAudioServiceStreamBase> stream,
     59                                audio_port_handle_t clientHandle) override;
     60 
     61     aaudio_result_t startClient(const android::AudioClient& client,
     62                                         audio_port_handle_t *clientHandle)  override;
     63 
     64     aaudio_result_t stopClient(audio_port_handle_t clientHandle)  override;
     65 
     66     aaudio_result_t getFreeRunningPosition(int64_t *positionFrames, int64_t *timeNanos) override;
     67 
     68     aaudio_result_t getTimestamp(int64_t *positionFrames, int64_t *timeNanos) override;
     69 
     70     // -------------- Callback functions for MmapStreamCallback ---------------------
     71     void onTearDown() override;
     72 
     73     void onVolumeChanged(audio_channel_mask_t channels,
     74                          android::Vector<float> values) override;
     75 
     76     void onRoutingChanged(audio_port_handle_t deviceId) override;
     77     // ------------------------------------------------------------------------------
     78 
     79     aaudio_result_t getDownDataDescription(AudioEndpointParcelable &parcelable);
     80 
     81     int64_t getHardwareTimeOffsetNanos() const {
     82         return mHardwareTimeOffsetNanos;
     83     }
     84 
     85 private:
     86     MonotonicCounter                          mFramesTransferred;
     87 
     88     // Interface to the AudioFlinger MMAP support.
     89     android::sp<android::MmapStreamInterface> mMmapStream;
     90     struct audio_mmap_buffer_info             mMmapBufferinfo;
     91     audio_port_handle_t                       mPortHandle = AUDIO_PORT_HANDLE_NONE;
     92 
     93     android::base::unique_fd                  mAudioDataFileDescriptor;
     94 
     95     int64_t                                   mHardwareTimeOffsetNanos = 0; // TODO get from HAL
     96 
     97 };
     98 
     99 } /* namespace aaudio */
    100 
    101 #endif //AAUDIO_SERVICE_ENDPOINT_MMAP_H
    102 
    103