axmol/cocos/audio/android/PcmAudioPlayer.cpp

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Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

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#define LOG_TAG "PcmAudioPlayer"

#include "audio/android/cutils/log.h"
#include "audio/android/PcmAudioPlayer.h"
#include "audio/android/AudioMixerController.h"
#include "audio/android/ICallerThreadUtils.h"

namespace cocos2d { namespace experimental {

PcmAudioPlayer::PcmAudioPlayer(AudioMixerController * controller, ICallerThreadUtils* callerThreadUtils)
        : _id(-1)
        , _track(nullptr)
        , _playEventCallback(nullptr)
        , _controller(controller)
        , _callerThreadUtils(callerThreadUtils)
{
    ALOGV("PcmAudioPlayer constructor: %p", this);
}

PcmAudioPlayer::~PcmAudioPlayer()
{
    ALOGV("In the destructor of PcmAudioPlayer (%p)", this);
    delete _track;
}

bool PcmAudioPlayer::prepare(const std::string &url, const PcmData &decResult)
{
    _url = url;
    _decResult = decResult;

    _track = new (std::nothrow) Track(_decResult);

    std::thread::id callerThreadId = _callerThreadUtils->getCallerThreadId();

    // @note The logic may cause this issue https://github.com/cocos2d/cocos2d-x/issues/17707
    // Assume that AudioEngine::stop(id) is invoked and the audio is played over meanwhile.
    // Since State::OVER and State::DESTROYED are triggered in the audio mixing thread, it will
    // call 'performFunctionInCallerThread' to post events to cocos's message queue.
    // Therefore, the sequence in cocos's thread will be |STOP|OVER|DESTROYED|.
    // Although, we remove the audio id in |STOPPED| callback, because it's asynchronous operation,
    // |OVER| and |DESTROYED| callbacks will still be invoked in cocos's thread.
    // HOW TO FIX: If the previous state is |STOPPED| and the current state
    // is |OVER|, just skip to invoke |OVER| callback.

    _track->onStateChanged = [this, callerThreadId](Track::State state) {
        // It maybe in sub thread
        Track::State prevState = _track->getPrevState();
        auto func = [this, state, prevState](){
            // It's in caller's thread
            if (state == Track::State::OVER && prevState != Track::State::STOPPED)
            {
                if (_playEventCallback != nullptr)
                {
                    _playEventCallback(State::OVER);
                }
            }
            else if (state == Track::State::STOPPED)
            {
                if (_playEventCallback != nullptr)
                {
                    _playEventCallback(State::STOPPED);
                }
            }
            else if (state == Track::State::DESTROYED)
            {
                delete this;
            }
        };

        if (callerThreadId == std::this_thread::get_id())
        { // onStateChanged(Track::State::STOPPED) is in caller's (Cocos's) thread.
            func();
        }
        else
        { // onStateChanged(Track::State::OVER) or onStateChanged(Track::State::DESTROYED) are in audio mixing thread.
            _callerThreadUtils->performFunctionInCallerThread(func);
        }
    };

    setVolume(1.0f);

    return true;
}

void PcmAudioPlayer::rewind()
{
    ALOGW("PcmAudioPlayer::rewind isn't supported!");
}

void PcmAudioPlayer::setVolume(float volume)
{
    _track->setVolume(volume);
}

float PcmAudioPlayer::getVolume() const
{
    return _track->getVolume();
}

void PcmAudioPlayer::setAudioFocus(bool isFocus)
{
    _track->setAudioFocus(isFocus);
}

void PcmAudioPlayer::setLoop(bool isLoop)
{
    _track->setLoop(isLoop);
}

bool PcmAudioPlayer::isLoop() const
{
    return _track->isLoop();
}

float PcmAudioPlayer::getDuration() const
{
    return _decResult.duration;
}

float PcmAudioPlayer::getPosition() const
{
    return _track->getPosition();
}

bool PcmAudioPlayer::setPosition(float pos)
{
    return _track->setPosition(pos);
}

void PcmAudioPlayer::setPlayEventCallback(const PlayEventCallback &playEventCallback)
{
    _playEventCallback = playEventCallback;
}

void PcmAudioPlayer::play()
{
    // put track to AudioMixerController
    ALOGV("PcmAudioPlayer (%p) play, url: %s", this, _url.c_str());
    _controller->addTrack(_track);
    _track->setState(Track::State::PLAYING);
}

void PcmAudioPlayer::pause()
{
    ALOGV("PcmAudioPlayer (%p) pause, url: %s", this, _url.c_str());
    _track->setState(Track::State::PAUSED);
}

void PcmAudioPlayer::resume()
{
    ALOGV("PcmAudioPlayer (%p) resume, url: %s", this, _url.c_str());
    _track->setState(Track::State::RESUMED);
}

void PcmAudioPlayer::stop()
{
    ALOGV("PcmAudioPlayer (%p) stop, url: %s", this, _url.c_str());
    _track->setState(Track::State::STOPPED);
}

IAudioPlayer::State PcmAudioPlayer::getState() const
{
    IAudioPlayer::State state = State::INVALID;

    if (_track != nullptr)
    {
        switch (_track->getState())
        {
            case Track::State::IDLE:
                state = State::INITIALIZED;
                break;

            case Track::State::PLAYING:
                state = State::PLAYING;
                break;

            case Track::State::RESUMED:
                state = State::PLAYING;
                break;

            case Track::State::PAUSED:
                state = State::PAUSED;
                break;

            case Track::State::STOPPED:
                state = State::STOPPED;
                break;

            case Track::State::OVER:
                state = State::OVER;
                break;

            default:
                state = State::INVALID;
                break;
        }
    }
    return state;
}

}} // namespace cocos2d { namespace experimental {