media/libaaudio/src/client/AudioStreamInternalCapture.h

/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#ifndef ANDROID_AAUDIO_AUDIO_STREAM_INTERNAL_CAPTURE_H
#define ANDROID_AAUDIO_AUDIO_STREAM_INTERNAL_CAPTURE_H

#include <stdint.h>
#include <aaudio/AAudio.h>

#include "binding/AAudioServiceInterface.h"
#include "client/AudioStreamInternal.h"

using android::sp;
using android::IAAudioService;

namespace aaudio {

class AudioStreamInternalCapture : public AudioStreamInternal {
public:
    AudioStreamInternalCapture(AAudioServiceInterface  &serviceInterface, bool inService = false);
    virtual ~AudioStreamInternalCapture();

    aaudio_result_t read(void *buffer,
                         int32_t numFrames,
                         int64_t timeoutNanoseconds) override;

    int64_t getFramesRead() override;
    int64_t getFramesWritten() override;

    void *callbackLoop() override;

    aaudio_direction_t getDirection() const override {
        return AAUDIO_DIRECTION_INPUT;
    }
protected:

/**
 * Low level data processing that will not block. It will just read or write as much as it can.
 *
 * It passes back a recommended time to wake up if wakeTimePtr is not NULL.
 *
 * @return the number of frames processed or a negative error code.
 */
    aaudio_result_t processDataNow(void *buffer,
                                   int32_t numFrames,
                                   int64_t currentTimeNanos,
                                   int64_t *wakeTimePtr) override;

private:
    /*
     * Asynchronous read with data conversion.
     * @param buffer
     * @param numFrames
     * @return frames written or negative error
     */
    aaudio_result_t readNowWithConversion(void *buffer, int32_t numFrames);

    int64_t       mLastFramesWritten = 0; // used to prevent retrograde motion
};

} /* namespace aaudio */

#endif //ANDROID_AAUDIO_AUDIO_STREAM_INTERNAL_CAPTURE_H