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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 #ifndef ANDROID_AAUDIO_AUDIO_STREAM_INTERNAL_CAPTURE_H
     17 #define ANDROID_AAUDIO_AUDIO_STREAM_INTERNAL_CAPTURE_H
     18 
     19 #include <stdint.h>
     20 #include <aaudio/AAudio.h>
     21 
     22 #include "binding/AAudioServiceInterface.h"
     23 #include "client/AudioStreamInternal.h"
     24 
     25 using android::sp;
     26 using android::IAAudioService;
     27 
     28 namespace aaudio {
     29 
     30 class AudioStreamInternalCapture : public AudioStreamInternal {
     31 public:
     32     AudioStreamInternalCapture(AAudioServiceInterface  &serviceInterface, bool inService = false);
     33     virtual ~AudioStreamInternalCapture();
     34 
     35     aaudio_result_t read(void *buffer,
     36                          int32_t numFrames,
     37                          int64_t timeoutNanoseconds) override;
     38 
     39     int64_t getFramesRead() override;
     40     int64_t getFramesWritten() override;
     41 
     42     void *callbackLoop() override;
     43 
     44     aaudio_direction_t getDirection() const override {
     45         return AAUDIO_DIRECTION_INPUT;
     46     }
     47 protected:
     48 
     49 /**
     50  * Low level data processing that will not block. It will just read or write as much as it can.
     51  *
     52  * It passes back a recommended time to wake up if wakeTimePtr is not NULL.
     53  *
     54  * @return the number of frames processed or a negative error code.
     55  */
     56     aaudio_result_t processDataNow(void *buffer,
     57                                    int32_t numFrames,
     58                                    int64_t currentTimeNanos,
     59                                    int64_t *wakeTimePtr) override;
     60 
     61 private:
     62     /*
     63      * Asynchronous read with data conversion.
     64      * @param buffer
     65      * @param numFrames
     66      * @return frames written or negative error
     67      */
     68     aaudio_result_t readNowWithConversion(void *buffer, int32_t numFrames);
     69 
     70     int64_t       mLastFramesWritten = 0; // used to prevent retrograde motion
     71 };
     72 
     73 } /* namespace aaudio */
     74 
     75 #endif //ANDROID_AAUDIO_AUDIO_STREAM_INTERNAL_CAPTURE_H
     76