axmol/cocos/audio/AudioEngineImpl.cpp

/****************************************************************************
 Copyright (c) 2014-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
 Copyright (c) 2018 HALX99.
 
 http://www.cocos2d-x.org

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 ****************************************************************************/
#define LOG_TAG "AudioEngineImpl"

#include "platform/CCPlatformConfig.h"

#include "audio/include/AudioEngineImpl.h"

#ifdef OPENAL_PLAIN_INCLUDES
#include "alc.h"
#include "alext.h"
#else
#include "AL/alc.h"
#include "AL/alext.h"
#endif
#include "audio/include/AudioEngine.h"
#include "base/CCDirector.h"
#include "base/CCScheduler.h"
#include "platform/CCFileUtils.h"
#include "audio/include/AudioDecoderManager.h"

using namespace cocos2d;

static ALCdevice *s_ALDevice = nullptr;
static ALCcontext *s_ALContext = nullptr;

AudioEngineImpl::AudioEngineImpl()
: _lazyInitLoop(true)
, _currentAudioID(0)
, _scheduler(nullptr)
{

}

AudioEngineImpl::~AudioEngineImpl()
{
    if (_scheduler != nullptr)
    {
        _scheduler->unschedule(CC_SCHEDULE_SELECTOR(AudioEngineImpl::update), this);
    }

    if (s_ALContext) {
        alDeleteSources(MAX_AUDIOINSTANCES, _alSources);

        _audioCaches.clear();

        alcMakeContextCurrent(nullptr);
        alcDestroyContext(s_ALContext);
        s_ALContext = nullptr;
    }

    if (s_ALDevice) {
        alcCloseDevice(s_ALDevice);
        s_ALDevice = nullptr;
    }

    AudioDecoderManager::destroy();
}

bool AudioEngineImpl::init()
{
    bool ret = false;
    do{
        s_ALDevice = alcOpenDevice(nullptr);

        if (s_ALDevice) {
            alGetError();
            s_ALContext = alcCreateContext(s_ALDevice, nullptr);
            alcMakeContextCurrent(s_ALContext);

            alGenSources(MAX_AUDIOINSTANCES, _alSources);
            auto alError = alGetError();
            if(alError != AL_NO_ERROR)
            {
                ALOGE("%s:generating sources failed! error = %x\n", __FUNCTION__, alError);
                break;
            }

            for (int i = 0; i < MAX_AUDIOINSTANCES; ++i) {
                _alSourceUsed[_alSources[i]] = false;
            }

            _scheduler = Director::getInstance()->getScheduler();
            ret = AudioDecoderManager::init();
            ALOGI("OpenAL was initialized successfully!");
        }
    }while (false);

    return ret;
}

AudioCache* AudioEngineImpl::preload(const std::string& filePath, std::function<void(bool)> callback)
{
    AudioCache* audioCache = nullptr;

    auto it = _audioCaches.find(filePath);
    if (it == _audioCaches.end()) {
        audioCache = &_audioCaches[filePath];
        audioCache->_fileFullPath = FileUtils::getInstance()->fullPathForFilename(filePath);
        unsigned int cacheId = audioCache->_id;
        auto isCacheDestroyed = audioCache->_isDestroyed;
        AudioEngine::addTask([audioCache, cacheId, isCacheDestroyed](){
            if (*isCacheDestroyed)
            {
                ALOGV("AudioCache (id=%u) was destroyed, no need to launch readDataTask.", cacheId);
                audioCache->setSkipReadDataTask(true);
                return;
            }
            audioCache->readDataTask(cacheId);
        });
    }
    else {
        audioCache = &it->second;
    }

    if (audioCache && callback)
    {
        audioCache->addLoadCallback(callback);
    }
    return audioCache;
}

AUDIO_ID AudioEngineImpl::play2d(const std::string &filePath ,bool loop ,float volume)
{
    if (s_ALDevice == nullptr) {
        return AudioEngine::INVALID_AUDIO_ID;
    }

    bool sourceFlag = false;
    ALuint alSource = 0;
    for (int i = 0; i < MAX_AUDIOINSTANCES; ++i) {
        alSource = _alSources[i];

        if ( !_alSourceUsed[alSource]) {
            sourceFlag = true;
            break;
        }
    }
    if(!sourceFlag){
        return AudioEngine::INVALID_AUDIO_ID;
    }

    auto player = new (std::nothrow) AudioPlayer;
    if (player == nullptr) {
        return AudioEngine::INVALID_AUDIO_ID;
    }

    player->_alSource = alSource;
    player->_loop = loop;
    player->_volume = volume;

    auto audioCache = preload(filePath, nullptr);
    if (audioCache == nullptr) {
        delete player;
        return AudioEngine::INVALID_AUDIO_ID;
    }

    player->setCache(audioCache);
    _threadMutex.lock();
    _audioPlayers.emplace(++_currentAudioID, player);
    _threadMutex.unlock();

    _alSourceUsed[alSource] = true;

    audioCache->addPlayCallback(std::bind(&AudioEngineImpl::_play2d,this,audioCache,_currentAudioID));

    if (_lazyInitLoop) {
        _lazyInitLoop = false;
        _scheduler->schedule(CC_SCHEDULE_SELECTOR(AudioEngineImpl::update), this, 0.05f, false);
    }

    return _currentAudioID;
}

void AudioEngineImpl::_play2d(AudioCache *cache, AUDIO_ID audioID)
{
    //Note: It may bn in sub thread or main thread :(
    if (!*cache->_isDestroyed && cache->_state == AudioCache::State::READY)
    {
        _threadMutex.lock();
        auto playerIt = _audioPlayers.find(audioID);
        if (playerIt != _audioPlayers.end() && playerIt->second->play2d()) {
            _scheduler->performFunctionInCocosThread([audioID](){

                if (AudioEngine::_audioIDInfoMap.find(audioID) != AudioEngine::_audioIDInfoMap.end()) {
                    AudioEngine::_audioIDInfoMap[audioID].state = AudioEngine::AudioState::PLAYING;
                }
            });
        }
        _threadMutex.unlock();
    }
    else
    {
        ALOGD("AudioEngineImpl::_play2d, cache was destroyed or not ready!");
        auto iter = _audioPlayers.find(audioID);
        if (iter != _audioPlayers.end())
        {
            iter->second->_removeByAudioEngine = true;
        }
    }
}

void AudioEngineImpl::setVolume(AUDIO_ID audioID,float volume)
{
    auto player = _audioPlayers[audioID];
    player->_volume = volume;

    if (player->_ready) {
        alSourcef(_audioPlayers[audioID]->_alSource, AL_GAIN, volume);

        auto error = alGetError();
        if (error != AL_NO_ERROR) {
            ALOGE("%s: audio id = %d, error = %x", __FUNCTION__,audioID,error);
        }
    }
}

void AudioEngineImpl::setLoop(AUDIO_ID audioID, bool loop)
{
    auto player = _audioPlayers[audioID];

    if (player->_ready) {
        if (player->_streamingSource) {
            player->setLoop(loop);
        } else {
            if (loop) {
                alSourcei(player->_alSource, AL_LOOPING, AL_TRUE);
            } else {
                alSourcei(player->_alSource, AL_LOOPING, AL_FALSE);
            }

            auto error = alGetError();
            if (error != AL_NO_ERROR) {
                ALOGE("%s: audio id = %d, error = %x", __FUNCTION__,audioID,error);
            }
        }
    }
    else {
        player->_loop = loop;
    }
}

bool AudioEngineImpl::pause(AUDIO_ID audioID)
{
    bool ret = true;
    alSourcePause(_audioPlayers[audioID]->_alSource);

    auto error = alGetError();
    if (error != AL_NO_ERROR) {
        ret = false;
        ALOGE("%s: audio id = %d, error = %x\n", __FUNCTION__,audioID,error);
    }

    return ret;
}

bool AudioEngineImpl::resume(AUDIO_ID audioID)
{
    bool ret = true;
    alSourcePlay(_audioPlayers[audioID]->_alSource);

    auto error = alGetError();
    if (error != AL_NO_ERROR) {
        ret = false;
        ALOGE("%s: audio id = %d, error = %x\n", __FUNCTION__,audioID,error);
    }

    return ret;
}

void AudioEngineImpl::stop(AUDIO_ID audioID)
{
    auto player = _audioPlayers[audioID];
    player->destroy();
    //Note: Don't set the flag to false here, it should be set in 'update' function.
    // Otherwise, the state got from alSourceState may be wrong
//    _alSourceUsed[player->_alSource] = false;

    // Call 'update' method to cleanup immediately since the schedule may be cancelled without any notification.
    update(0.0f);
}

void AudioEngineImpl::stopAll()
{
    for(auto&& player : _audioPlayers)
    {
        player.second->destroy();
    }
    //Note: Don't set the flag to false here, it should be set in 'update' function.
    // Otherwise, the state got from alSourceState may be wrong
//    for(int index = 0; index < MAX_AUDIOINSTANCES; ++index)
//    {
//        _alSourceUsed[_alSources[index]] = false;
//    }

    // Call 'update' method to cleanup immediately since the schedule may be cancelled without any notification.
    update(0.0f);
}

float AudioEngineImpl::getDuration(AUDIO_ID audioID)
{
    auto player = _audioPlayers[audioID];
    if(player->_ready){
        return player->_audioCache->_duration;
    } else {
        return AudioEngine::TIME_UNKNOWN;
    }
}

float AudioEngineImpl::getCurrentTime(AUDIO_ID audioID)
{
    float ret = 0.0f;
    auto player = _audioPlayers[audioID];
    if(player->_ready){
        if (player->_streamingSource) {
            ret = player->getTime();
        } else {
            alGetSourcef(player->_alSource, AL_SEC_OFFSET, &ret);

            auto error = alGetError();
            if (error != AL_NO_ERROR) {
                ALOGE("%s, audio id:%d,error code:%x", __FUNCTION__,audioID,error);
            }
        }
    }

    return ret;
}

bool AudioEngineImpl::setCurrentTime(AUDIO_ID audioID, float time)
{
    bool ret = false;
    auto player = _audioPlayers[audioID];

    do {
        if (!player->_ready) {
            break;
        }

        if (player->_streamingSource) {
            ret = player->setTime(time);
            break;
        }
        else {
            if (player->_audioCache->_framesRead != player->_audioCache->_totalFrames &&
                (time * player->_audioCache->_sampleRate) > player->_audioCache->_framesRead) {
                ALOGE("%s: audio id = %d", __FUNCTION__,audioID);
                break;
            }

            alSourcef(player->_alSource, AL_SEC_OFFSET, time);

            auto error = alGetError();
            if (error != AL_NO_ERROR) {
                ALOGE("%s: audio id = %d, error = %x", __FUNCTION__,audioID,error);
            }
            ret = true;
        }
    } while (0);

    return ret;
}

void AudioEngineImpl::setFinishCallback(AUDIO_ID audioID, const std::function<void (AUDIO_ID, const std::string &)> &callback)
{
    _audioPlayers[audioID]->_finishCallbak = callback;
}

void AudioEngineImpl::update(float dt)
{
    AUDIO_ID audioID;
    AudioPlayer* player;
    ALuint alSource;

//    ALOGV("AudioPlayer count: %d", (int)_audioPlayers.size());
    _threadMutex.lock();

    for (auto it = _audioPlayers.begin(); it != _audioPlayers.end(); ) {
        audioID = it->first;
        player = it->second;
        alSource = player->_alSource;

        if (player->_removeByAudioEngine)
        {
            AudioEngine::remove(audioID);
            
            it = _audioPlayers.erase(it);
            delete player;
            _alSourceUsed[alSource] = false;
        }
        else if (player->_ready && player->isFinished()) {

            std::string filePath;
            if (player->_finishCallbak) {
                auto& audioInfo = AudioEngine::_audioIDInfoMap[audioID];
                filePath = *audioInfo.filePath;
            }

            AudioEngine::remove(audioID);
            
            it = _audioPlayers.erase(it);

            if (player->_finishCallbak) {
#if !defined(_MSC_VER) || _MSC_VER >= 1900
                _finishCallbacks.push_back([finishCallback = std::move(player->_finishCallbak), audioID, filePath = std::move(filePath)] {
                    finishCallback(audioID, filePath); //FIXME: callback will delay 50ms
                });
#else
                auto finishCallback = std::move(player->_finishCallbak);
                _finishCallbacks.push_back([=]{
                    finishCallback(audioID, filePath); //FIXME: callback will delay 50ms
                });
#endif
            }
            delete player;
            _alSourceUsed[alSource] = false;
        }
        else{
            ++it;
        }
    }

    if(_audioPlayers.empty()) {
        _lazyInitLoop = true;
        _scheduler->unschedule(CC_SCHEDULE_SELECTOR(AudioEngineImpl::update), this);
    }
    _threadMutex.unlock();

    if (!_finishCallbacks.empty()) {
        for (auto& finishCallback : _finishCallbacks)
            finishCallback();
        _finishCallbacks.clear();
    }
}

void AudioEngineImpl::uncache(const std::string &filePath)
{
    _audioCaches.erase(filePath);
}

void AudioEngineImpl::uncacheAll()
{
    _audioCaches.clear();
}