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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 ANDROID_AAUDIO_AUDIO_STREAM_INTERNAL_PLAY_H
     18 #define ANDROID_AAUDIO_AUDIO_STREAM_INTERNAL_PLAY_H
     19 
     20 #include <stdint.h>
     21 #include <aaudio/AAudio.h>
     22 
     23 #include "binding/AAudioServiceInterface.h"
     24 #include "client/AudioStreamInternal.h"
     25 
     26 using android::sp;
     27 using android::IAAudioService;
     28 
     29 namespace aaudio {
     30 
     31 class AudioStreamInternalPlay : public AudioStreamInternal {
     32 public:
     33     AudioStreamInternalPlay(AAudioServiceInterface  &serviceInterface, bool inService = false);
     34     virtual ~AudioStreamInternalPlay();
     35 
     36     aaudio_result_t requestPause() override;
     37 
     38     aaudio_result_t requestFlush() override;
     39 
     40     aaudio_result_t write(const void *buffer,
     41                           int32_t numFrames,
     42                           int64_t timeoutNanoseconds) override;
     43 
     44     int64_t getFramesRead() override;
     45     int64_t getFramesWritten() override;
     46 
     47     void *callbackLoop() override;
     48 
     49     aaudio_direction_t getDirection() const override {
     50         return AAUDIO_DIRECTION_OUTPUT;
     51     }
     52 
     53 protected:
     54 
     55     aaudio_result_t requestPauseInternal();
     56 
     57     void advanceClientToMatchServerPosition() override;
     58 
     59     void onFlushFromServer() override;
     60 
     61     android::status_t doSetVolume() override;
     62 
     63 /**
     64  * Low level write that will not block. It will just write as much as it can.
     65  *
     66  * It passed back a recommended time to wake up if wakeTimePtr is not NULL.
     67  *
     68  * @return the number of frames written or a negative error code.
     69  */
     70     aaudio_result_t processDataNow(void *buffer,
     71                              int32_t numFrames,
     72                              int64_t currentTimeNanos,
     73                              int64_t *wakeTimePtr) override;
     74 private:
     75     /*
     76      * Asynchronous write with data conversion.
     77      * @param buffer
     78      * @param numFrames
     79      * @return fdrames written or negative error
     80      */
     81     aaudio_result_t writeNowWithConversion(const void *buffer,
     82                                            int32_t numFrames);
     83 
     84     int64_t                  mLastFramesRead = 0; // used to prevent retrograde motion
     85 
     86     LinearRamp               mVolumeRamp;
     87 
     88 };
     89 
     90 } /* namespace aaudio */
     91 
     92 #endif //ANDROID_AAUDIO_AUDIO_STREAM_INTERNAL_PLAY_H
     93