AndroidSLESMediaQueue.h

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/*
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *     http://aws.amazon.com/apache2.0/
 *
 * or in the "license" file accompanying this file. This file 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 ALEXA_CLIENT_SDK_MEDIAPLAYER_ANDROIDSLESMEDIAPLAYER_INCLUDE_ANDROIDSLESMEDIAPLAYER_ANDROIDSLESMEDIAQUEUE_H_
#define ALEXA_CLIENT_SDK_MEDIAPLAYER_ANDROIDSLESMEDIAPLAYER_INCLUDE_ANDROIDSLESMEDIAPLAYER_ANDROIDSLESMEDIAQUEUE_H_

#include <array>
#include <atomic>
#include <chrono>
#include <mutex>
#include <vector>

#include <SLES/OpenSLES_Android.h>

#include <AVSCommon/Utils/Threading/Executor.h>
#include <AndroidUtilities/AndroidSLESObject.h>

#include "AndroidSLESMediaPlayer/DecoderInterface.h"
#include "AndroidSLESMediaPlayer/PlaybackConfiguration.h"

namespace alexaClientSDK {
namespace mediaPlayer {
namespace android {

class AndroidSLESMediaQueue {
public:
    using Byte = DecoderInterface::Byte;

    enum class QueueEvent {
        ERROR,
        FINISHED_READING,
        FINISHED_PLAYING
    };

    using EventCallback = std::function<void(QueueEvent event, const std::string& reason)>;

    static std::unique_ptr<AndroidSLESMediaQueue> create(
        std::shared_ptr<applicationUtilities::androidUtilities::AndroidSLESObject> queueObject,
        std::unique_ptr<DecoderInterface> decoder,
        EventCallback onStatusChanged,
        const PlaybackConfiguration& playbackConfiguration);

    void onBufferFree();

    ~AndroidSLESMediaQueue();

    size_t getNumBytesBuffered() const;

    size_t getNumBytesPlayed() const;

    static constexpr size_t NUMBER_OF_BUFFERS{4u};

    static constexpr size_t BUFFER_SIZE{131072u};

private:
    AndroidSLESMediaQueue(
        std::shared_ptr<applicationUtilities::androidUtilities::AndroidSLESObject> queueObject,
        SLAndroidSimpleBufferQueueItf bufferQueue,
        std::unique_ptr<DecoderInterface> decoder,
        EventCallback callbackFunction);

    void fillBuffer();

    void fillAllBuffers(const PlaybackConfiguration& configuration);

    void enqueueSilence(const PlaybackConfiguration& configuration);

    avsCommon::utils::threading::Executor m_executor;

    std::shared_ptr<applicationUtilities::androidUtilities::AndroidSLESObject> m_slObject;

    SLAndroidSimpleBufferQueueItf m_queueInterface;

    std::array<std::array<Byte, BUFFER_SIZE>, NUMBER_OF_BUFFERS> m_buffers;

    std::vector<size_t> m_bufferSizes;

    std::unique_ptr<DecoderInterface> m_decoder;

    size_t m_index;

    bool m_inputEof;

    bool m_failure;

    EventCallback m_eventCallback;

    std::atomic<size_t> m_bufferedWords;

    std::atomic<size_t> m_playedWords;
};

}  // namespace android
}  // namespace mediaPlayer
}  // namespace alexaClientSDK

#endif  // ALEXA_CLIENT_SDK_MEDIAPLAYER_ANDROIDSLESMEDIAPLAYER_INCLUDE_ANDROIDSLESMEDIAPLAYER_ANDROIDSLESMEDIAQUEUE_H_