axmol/cocos/audio/android/UrlAudioPlayer.cpp

/****************************************************************************
Copyright (c) 2016 Chukong Technologies Inc.

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#define LOG_TAG "UrlAudioPlayer"

#include "audio/android/UrlAudioPlayer.h"
#include "audio/android/ICallerThreadUtils.h"

#include <math.h>
#include <algorithm> // for std::find

namespace {

std::mutex __playerContainerMutex;
std::vector<cocos2d::experimental::UrlAudioPlayer*> __playerContainer;
std::once_flag __onceFlag;

}

namespace cocos2d { namespace experimental {

class SLUrlAudioPlayerCallbackProxy
{
public:
    static void playEventCallback(SLPlayItf caller, void *context, SLuint32 playEvent)
    {
        UrlAudioPlayer *thiz = (UrlAudioPlayer *) context;
        // We must use a mutex for the whole block of the following function invocation.
        std::lock_guard<std::mutex> lk(__playerContainerMutex);
        auto iter = std::find(__playerContainer.begin(), __playerContainer.end(), thiz);
        if (iter != __playerContainer.end())
        {
            thiz->playEventCallback(caller, playEvent);
        }
    }
};

UrlAudioPlayer::UrlAudioPlayer(SLEngineItf engineItf, SLObjectItf outputMixObject, ICallerThreadUtils* callerThreadUtils)
        : _engineItf(engineItf), _outputMixObj(outputMixObject),
          _callerThreadUtils(callerThreadUtils), _id(-1), _assetFd(nullptr),
          _playObj(nullptr), _playItf(nullptr), _seekItf(nullptr), _volumeItf(nullptr),
          _volume(0.0f), _duration(0.0f), _isLoop(false), _state(State::INVALID),
          _playEventCallback(nullptr), _isDestroyed(std::make_shared<bool>(false))
{
    std::call_once(__onceFlag, [](){
        __playerContainer.reserve(10);
    });

    __playerContainerMutex.lock();
    __playerContainer.push_back(this);
    ALOGV("Current UrlAudioPlayer instance count: %d", __playerContainer.size());
    __playerContainerMutex.unlock();

    _callerThreadId = callerThreadUtils->getCallerThreadId();
}

UrlAudioPlayer::~UrlAudioPlayer()
{
    ALOGV("~UrlAudioPlayer(): %p", this);

    __playerContainerMutex.lock();

    auto iter = std::find(__playerContainer.begin(), __playerContainer.end(), this);
    if (iter != __playerContainer.end())
    {
        __playerContainer.erase(iter);
    }

    __playerContainerMutex.unlock();
}

void UrlAudioPlayer::playEventCallback(SLPlayItf caller, SLuint32 playEvent)
{
    // Note that it's on sub thread, please don't invoke OpenSLES API on sub thread
    if (playEvent == SL_PLAYEVENT_HEADATEND)
    {
        std::shared_ptr<bool> isDestroyed = _isDestroyed;

        auto func = [this, isDestroyed](){
            // If it was destroyed, just return.
            if (*isDestroyed)
            {
                ALOGV("The UrlAudioPlayer (%p) was destroyed!", this);
                return;
            }

            //Note that It's in the caller's thread (Cocos Thread)
            // If state is already stopped, ignore the play over event.

            if (_state == State::STOPPED)
            {
                return;
            }

            //fix issue#8965:AudioEngine can't looping audio on Android 2.3.x
            if (isLoop())
            {
                play();
            }
            else
            {
                setState(State::OVER);
                if (_playEventCallback != nullptr)
                {
                    _playEventCallback(State::OVER);
                }

                ALOGV("UrlAudioPlayer (%p) played over, destroy self ...", this);
                destroy();
                delete this;
            }
        };

        if (_callerThreadId == std::this_thread::get_id())
        {
            func();
        }
        else
        {
            _callerThreadUtils->performFunctionInCallerThread(func);
        }
    }
}

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

void UrlAudioPlayer::stop()
{
    ALOGV("UrlAudioPlayer::stop (%p, %d)", this, getId());
    SLresult r = (*_playItf)->SetPlayState(_playItf, SL_PLAYSTATE_STOPPED);
    SL_RETURN_IF_FAILED(r, "UrlAudioPlayer::stop failed");

    if (_state == State::PLAYING || _state == State::PAUSED)
    {
        setLoop(false);
        setState(State::STOPPED);

        if (_playEventCallback != nullptr)
        {
            _playEventCallback(State::STOPPED);
        }

        destroy();
        delete this;
    }
    else
    {
        ALOGW("UrlAudioPlayer (%p, state:%d) isn't playing or paused, could not invoke stop!", this, static_cast<int>(_state));
    }
}

void UrlAudioPlayer::pause()
{
    if (_state == State::PLAYING)
    {
        SLresult r = (*_playItf)->SetPlayState(_playItf, SL_PLAYSTATE_PAUSED);
        SL_RETURN_IF_FAILED(r, "UrlAudioPlayer::pause failed");
        setState(State::PAUSED);
    }
    else
    {
        ALOGW("UrlAudioPlayer (%p, state:%d) isn't playing, could not invoke pause!", this, static_cast<int>(_state));
    }
}

void UrlAudioPlayer::resume()
{
    if (_state == State::PAUSED)
    {
        SLresult r = (*_playItf)->SetPlayState(_playItf, SL_PLAYSTATE_PLAYING);
        SL_RETURN_IF_FAILED(r, "UrlAudioPlayer::resume failed");
        setState(State::PLAYING);
    }
    else
    {
        ALOGW("UrlAudioPlayer (%p, state:%d) isn't paused, could not invoke resume!", this, static_cast<int>(_state));
    }
}

void UrlAudioPlayer::play()
{
    if (_state == State::INITIALIZED || _state == State::PAUSED)
    {
        SLresult r = (*_playItf)->SetPlayState(_playItf, SL_PLAYSTATE_PLAYING);
        SL_RETURN_IF_FAILED(r, "UrlAudioPlayer::play failed");
        setState(State::PLAYING);
    }
    else
    {
        ALOGW("UrlAudioPlayer (%p, state:%d) isn't paused or initialized, could not invoke play!", this, static_cast<int>(_state));
    }
}

void UrlAudioPlayer::setVolume(float volume)
{
    _volume = volume;
    int dbVolume = 2000 * log10(volume);
    if (dbVolume < SL_MILLIBEL_MIN)
    {
        dbVolume = SL_MILLIBEL_MIN;
    }
    SLresult r = (*_volumeItf)->SetVolumeLevel(_volumeItf, dbVolume);
    SL_RETURN_IF_FAILED(r, "UrlAudioPlayer::setVolume %d failed", dbVolume);
}

float UrlAudioPlayer::getDuration() const
{
    if (_duration > 0)
    {
        return _duration;
    }

    SLmillisecond duration;
    SLresult r = (*_playItf)->GetDuration(_playItf, &duration);
    SL_RETURN_VAL_IF_FAILED(r, 0.0f, "UrlAudioPlayer::getDuration failed");

    if (duration == SL_TIME_UNKNOWN)
    {
        return -1.0f;
    }
    else
    {
        const_cast<UrlAudioPlayer *>(this)->_duration = duration / 1000.0f;

        if (_duration <= 0)
        {
            return -1.0f;
        }
    }
    return _duration;
}

float UrlAudioPlayer::getPosition() const
{
    SLmillisecond millisecond;
    SLresult r = (*_playItf)->GetPosition(_playItf, &millisecond);
    SL_RETURN_VAL_IF_FAILED(r, 0.0f, "UrlAudioPlayer::getPosition failed");
    return millisecond / 1000.0f;
}

bool UrlAudioPlayer::setPosition(float pos)
{
    SLmillisecond millisecond = 1000.0f * pos;
    SLresult r = (*_seekItf)->SetPosition(_seekItf, millisecond, SL_SEEKMODE_ACCURATE);
    SL_RETURN_VAL_IF_FAILED(r, false, "UrlAudioPlayer::setPosition %f failed", pos);
    return true;
}

bool UrlAudioPlayer::prepare(const std::string &url, SLuint32 locatorType, std::shared_ptr<AssetFd> assetFd, int start,
                             int length)
{
    _url = url;
    _assetFd = assetFd;

    ALOGV("UrlAudioPlayer::prepare: %s, %d, %d, %d, %d", _url.c_str(), (int)locatorType, assetFd->getFd(), start,
         length);
    SLDataSource audioSrc;

    SLDataFormat_MIME formatMime = {SL_DATAFORMAT_MIME, nullptr, SL_CONTAINERTYPE_UNSPECIFIED};
    audioSrc.pFormat = &formatMime;

    //Note: locFd & locUri should be outside of the following if/else block
    // Although locFd & locUri are only used inside if/else block, its lifecycle
    // will be destroyed right after '}' block. And since we pass a pointer to
    // 'audioSrc.pLocator=&locFd/&locUri', pLocator will point to an invalid address
    // while invoking Engine::createAudioPlayer interface. So be care of change the position
    // of these two variables.
    SLDataLocator_AndroidFD locFd;
    SLDataLocator_URI locUri;

    if (locatorType == SL_DATALOCATOR_ANDROIDFD)
    {
        locFd = {locatorType, _assetFd->getFd(), start, length};
        audioSrc.pLocator = &locFd;
    }
    else if (locatorType == SL_DATALOCATOR_URI)
    {
        locUri = {locatorType, (SLchar *) _url.c_str()};
        audioSrc.pLocator = &locUri;
        ALOGV("locUri: locatorType: %d", (int)locUri.locatorType);
    }
    else
    {
        ALOGE("Oops, invalid locatorType: %d", (int)locatorType);
        return false;
    }

    // configure audio sink
    SLDataLocator_OutputMix locOutmix = {SL_DATALOCATOR_OUTPUTMIX, _outputMixObj};
    SLDataSink audioSnk = {&locOutmix, nullptr};

    // create audio player
    const SLInterfaceID ids[3] = {SL_IID_SEEK, SL_IID_PREFETCHSTATUS, SL_IID_VOLUME};
    const SLboolean req[3] = {SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE};

    SLresult result = (*_engineItf)->CreateAudioPlayer(_engineItf, &_playObj, &audioSrc, &audioSnk,
                                                       3, ids, req);
    SL_RETURN_VAL_IF_FAILED(result, false, "CreateAudioPlayer failed");

    // realize the player
    result = (*_playObj)->Realize(_playObj, SL_BOOLEAN_FALSE);
    SL_RETURN_VAL_IF_FAILED(result, false, "Realize failed");

    // get the play interface
    result = (*_playObj)->GetInterface(_playObj, SL_IID_PLAY, &_playItf);
    SL_RETURN_VAL_IF_FAILED(result, false, "GetInterface SL_IID_PLAY failed");

    // get the seek interface
    result = (*_playObj)->GetInterface(_playObj, SL_IID_SEEK, &_seekItf);
    SL_RETURN_VAL_IF_FAILED(result, false, "GetInterface SL_IID_SEEK failed");

    // get the volume interface
    result = (*_playObj)->GetInterface(_playObj, SL_IID_VOLUME, &_volumeItf);
    SL_RETURN_VAL_IF_FAILED(result, false, "GetInterface SL_IID_VOLUME failed");

    result = (*_playItf)->RegisterCallback(_playItf,
                                           SLUrlAudioPlayerCallbackProxy::playEventCallback, this);
    SL_RETURN_VAL_IF_FAILED(result, false, "RegisterCallback failed");

    result = (*_playItf)->SetCallbackEventsMask(_playItf, SL_PLAYEVENT_HEADATEND);
    SL_RETURN_VAL_IF_FAILED(result, false, "SetCallbackEventsMask SL_PLAYEVENT_HEADATEND failed");

    setState(State::INITIALIZED);

    setVolume(1.0f);

    return true;
}

void UrlAudioPlayer::rewind()
{
// Not supported currently. since cocos audio engine will new -> prepare -> play again.
}

float UrlAudioPlayer::getVolume() const
{
    return _volume;
}

void UrlAudioPlayer::setLoop(bool isLoop)
{
    _isLoop = isLoop;

    SLboolean loopEnable = _isLoop ? SL_BOOLEAN_TRUE : SL_BOOLEAN_FALSE;
    SLresult r = (*_seekItf)->SetLoop(_seekItf, loopEnable, 0, SL_TIME_UNKNOWN);
    SL_RETURN_IF_FAILED(r, "UrlAudioPlayer::setLoop %d failed", _isLoop ? 1 : 0);
}

bool UrlAudioPlayer::isLoop() const
{
    return _isLoop;
}

void UrlAudioPlayer::stopAll()
{
    // To avoid break the for loop, we need to copy a new map
    __playerContainerMutex.lock();
    auto temp = __playerContainer;
    __playerContainerMutex.unlock();

    for (auto&& player : temp)
    {
        player->stop();
    }
}

void UrlAudioPlayer::destroy()
{
    if (!*_isDestroyed)
    {
        *_isDestroyed = true;
        ALOGV("UrlAudioPlayer::destroy() %p", this);
        SL_DESTROY_OBJ(_playObj);
        ALOGV("UrlAudioPlayer::destroy end");
    }
}

}} // namespace cocos2d { namespace experimental {