media/libaaudio/src/legacy/AudioStreamTrack.h

/*
 * Copyright 2016 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 LEGACY_AUDIO_STREAM_TRACK_H
#define LEGACY_AUDIO_STREAM_TRACK_H

#include <math.h>
#include <media/TrackPlayerBase.h>
#include <media/AudioTrack.h>
#include <aaudio/AAudio.h>

#include "AudioStreamBuilder.h"
#include "AudioStream.h"
#include "legacy/AAudioLegacy.h"
#include "legacy/AudioStreamLegacy.h"
#include "utility/FixedBlockReader.h"

namespace aaudio {

/**
 * Internal stream that uses the legacy AudioTrack path.
 */
class AudioStreamTrack : public AudioStreamLegacy {
public:
    AudioStreamTrack();

    virtual ~AudioStreamTrack();


    aaudio_result_t open(const AudioStreamBuilder & builder) override;
    aaudio_result_t release_l() override;
    void close_l() override;

    aaudio_result_t requestStart() override;
    aaudio_result_t requestPause() override;
    aaudio_result_t requestFlush() override;
    aaudio_result_t requestStop() override;

    bool isFlushSupported() const override {
        // Only implement FLUSH for OUTPUT streams.
        return true;
    }

    bool isPauseSupported() const override {
        // Only implement PAUSE for OUTPUT streams.
        return true;
    }

    aaudio_result_t getTimestamp(clockid_t clockId,
                                       int64_t *framePosition,
                                       int64_t *timeNanoseconds) override;

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

    aaudio_result_t setBufferSize(int32_t requestedFrames) override;
    int32_t getBufferSize() const override;
    int32_t getBufferCapacity() const override;
    int32_t getFramesPerBurst()const  override;
    int32_t getXRunCount() const override;

    int64_t getFramesRead() override;

    aaudio_direction_t getDirection() const override {
        return AAUDIO_DIRECTION_OUTPUT;
    }

    aaudio_result_t updateStateMachine() override;

    // This is public so it can be called from the C callback function.
    void processCallback(int event, void *info) override;

    int64_t incrementClientFrameCounter(int32_t frames) override {
        return incrementFramesWritten(frames);
    }

    android::status_t doSetVolume() override;

#if AAUDIO_USE_VOLUME_SHAPER
    virtual android::binder::Status applyVolumeShaper(
            const android::media::VolumeShaper::Configuration& configuration,
            const android::media::VolumeShaper::Operation& operation) override;
#endif

private:

    android::sp<android::AudioTrack> mAudioTrack;

    // adapts between variable sized blocks and fixed size blocks
    FixedBlockReader                 mFixedBlockReader;

    // TODO add 64-bit position reporting to AudioTrack and use it.
    aaudio_wrapping_frames_t         mPositionWhenPausing = 0;

    // initial AudioTrack frame count and notification period
    int32_t mInitialBufferCapacity = 0;
    int32_t mInitialFramesPerBurst = 0;
};

} /* namespace aaudio */

#endif /* LEGACY_AUDIO_STREAM_TRACK_H */