axmol/cocos/audio/android/AudioPlayerProvider.cpp

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

http://www.cocos2d-x.org

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#define LOG_TAG "AudioPlayerProvider"

#include "audio/android/AudioPlayerProvider.h"
#include "audio/android/UrlAudioPlayer.h"
#include "audio/android/PcmAudioPlayer.h"
#include "audio/android/AudioDecoder.h"
#include "audio/android/AudioMixerController.h"
#include "audio/android/PcmAudioService.h"
#include "audio/android/CCThreadPool.h"
#include "audio/android/ICallerThreadUtils.h"

#include <sys/system_properties.h>
#include <stdlib.h>
#include <algorithm> // for std::find_if

namespace cocos2d { namespace experimental {

static int getSystemAPILevel()
{
    static int __systemApiLevel = -1;
    if (__systemApiLevel > 0)
    {
        return __systemApiLevel;
    }

    int apiLevel = -1;
    char sdk_ver_str[PROP_VALUE_MAX] = {0};
    auto len = __system_property_get("ro.build.version.sdk", sdk_ver_str);
    if (len > 0)
    {
        apiLevel = atoi(sdk_ver_str);
        ALOGD("Android API level: %d", apiLevel);
    }
    else
    {
        ALOGE("Fail to get Android API level!");
    }
    __systemApiLevel = apiLevel;
    return apiLevel;
}

struct AudioFileIndicator
{
    std::string extension;
    int smallSizeIndicator;
};

static AudioFileIndicator __audioFileIndicator[] = {
        {"default", 128000}, // If we could not handle the audio format, return default value, the position should be first.
        {".wav",    1024000},
        {".ogg",    128000},
        {".mp3",    160000}
};

AudioPlayerProvider::AudioPlayerProvider(SLEngineItf engineItf, SLObjectItf outputMixObject,
                                         int deviceSampleRate, int bufferSizeInFrames,
                                         const FdGetterCallback &fdGetterCallback,
                                         ICallerThreadUtils* callerThreadUtils)
        : _engineItf(engineItf), _outputMixObject(outputMixObject),
          _deviceSampleRate(deviceSampleRate), _bufferSizeInFrames(bufferSizeInFrames),
          _fdGetterCallback(fdGetterCallback), _callerThreadUtils(callerThreadUtils),
          _pcmAudioService(nullptr), _mixController(nullptr),
          _threadPool(ThreadPool::newCachedThreadPool(1, 8, 5, 2, 2))
{
    ALOGI("deviceSampleRate: %d, bufferSizeInFrames: %d", _deviceSampleRate, _bufferSizeInFrames);
    if (getSystemAPILevel() >= 17)
    {
        _mixController = new (std::nothrow) AudioMixerController(_bufferSizeInFrames, _deviceSampleRate, 2);
        _mixController->init();
        _pcmAudioService = new (std::nothrow) PcmAudioService(engineItf, outputMixObject);
        _pcmAudioService->init(_mixController, 2, deviceSampleRate, bufferSizeInFrames * 2);
    }

    ALOG_ASSERT(callerThreadUtils != nullptr, "Caller thread utils parameter should not be nullptr!");
}

AudioPlayerProvider::~AudioPlayerProvider()
{
    ALOGV("~AudioPlayerProvider()");
    UrlAudioPlayer::stopAll();

    SL_SAFE_DELETE(_pcmAudioService);
    SL_SAFE_DELETE(_mixController);
    SL_SAFE_DELETE(_threadPool);
}

IAudioPlayer *AudioPlayerProvider::getAudioPlayer(const std::string &audioFilePath)
{
    // Pcm data decoding by OpenSLES API only supports in API level 17 and later.
    if (getSystemAPILevel() < 17)
    {
        AudioFileInfo info = getFileInfo(audioFilePath);
        if (info.isValid())
        {
            return createUrlAudioPlayer(info);
        }

        return nullptr;
    }

    IAudioPlayer *player = nullptr;

    _pcmCacheMutex.lock();
    auto iter = _pcmCache.find(audioFilePath);
    if (iter != _pcmCache.end())
    {// Found pcm cache means it was used to be a PcmAudioService
        PcmData pcmData = iter->second;
        _pcmCacheMutex.unlock();
        player = obtainPcmAudioPlayer(audioFilePath, pcmData);
    }
    else
    {
        _pcmCacheMutex.unlock();
        // Check audio file size to determine to use a PcmAudioService or UrlAudioPlayer,
        // generally PcmAudioService is used for playing short audio like game effects while
        // playing background music uses UrlAudioPlayer
        AudioFileInfo info = getFileInfo(audioFilePath);
        if (info.isValid())
        {
            if (isSmallFile(info))
            {
                // Put an empty lambda to preloadEffect since we only want the future object to get PcmData
                auto pcmData = std::make_shared<PcmData>();
                auto isSucceed = std::make_shared<bool>(false);
                auto isReturnFromCache = std::make_shared<bool>(false);

                std::thread::id threadId = std::this_thread::get_id();

                preloadEffect(info, [threadId, pcmData, isSucceed, isReturnFromCache](bool succeed, PcmData data){
                    // If the callback is in the same thread as caller's, it means that we found it
                    // in the cache
                    *isReturnFromCache = std::this_thread::get_id() == threadId;
                    *pcmData = data;
                    *isSucceed = succeed;
                });

                if (!*isReturnFromCache)
                {
                    std::unique_lock<std::mutex> lk(_preloadWaitMutex);
                    // Wait for 2 seconds for the decoding in sub thread finishes.
                    ALOGV("Waiting preload (%s) to finish ...", audioFilePath.c_str());
                    _preloadWaitCond.wait_for(lk, std::chrono::seconds(2));
                }

                if (*isSucceed)
                {
                    if (pcmData->isValid())
                    {
                        player = obtainPcmAudioPlayer(info.url, *pcmData);
                    }
                }
            }
            else
            {
                player = createUrlAudioPlayer(info);
            }
        }
    }

    return player;
}

void AudioPlayerProvider::preloadEffect(const std::string &audioFilePath, const PreloadCallback& cb)
{
    // Pcm data decoding by OpenSLES API only supports in API level 17 and later.
    if (getSystemAPILevel() < 17)
    {
        PcmData data;
        cb(true, data);
        return;
    }

    {
        std::lock_guard<std::mutex> lk(_pcmCacheMutex);
        auto&& iter = _pcmCache.find(audioFilePath);
        if (iter != _pcmCache.end())
        {
            ALOGV("preload return from cache: (%s)", audioFilePath.c_str());
            cb(true, iter->second);
            return;
        }
    }

    auto info = getFileInfo(audioFilePath);
    preloadEffect(info, [this, cb, audioFilePath](bool succeed, PcmData data){

        _callerThreadUtils->performFunctionInCallerThread([this, succeed, data, cb](){
            cb(succeed, data);
        });

    });
}

// Used internally
void AudioPlayerProvider::preloadEffect(const AudioFileInfo &info, const PreloadCallback& cb)
{
    PcmData pcmData;

    if (!info.isValid())
    {
        cb(false, pcmData);
        return;
    }

    if (isSmallFile(info))
    {
        std::string audioFilePath = info.url;

        {
            // 1. First time check, if it wasn't in the cache, goto 2 step
            std::lock_guard<std::mutex> lk(_pcmCacheMutex);
            auto&& iter = _pcmCache.find(audioFilePath);
            if (iter != _pcmCache.end())
            {
                ALOGV("1. Return pcm data from cache, url: %s", info.url.c_str());
                cb(true, iter->second);
                return;
            }
        }

        {
            // 2. Check whether the audio file is being preloaded, if it has been removed from map just now,
            // goto step 3
            std::lock_guard<std::mutex> lk(_preloadCallbackMutex);

            auto&& preloadIter = _preloadCallbackMap.find(audioFilePath);
            if (preloadIter != _preloadCallbackMap.end())
            {
                ALOGV("audio (%s) is being preloaded, add to callback vector!", audioFilePath.c_str());
                PreloadCallbackParam param;
                param.callback = cb;
                preloadIter->second.push_back(std::move(param));
                return;
            }

            {   // 3. Check it in cache again. If it has been removed from map just now, the file is in
                // the cache absolutely.
                std::lock_guard<std::mutex> lk2(_pcmCacheMutex);
                auto&& iter = _pcmCache.find(audioFilePath);
                if (iter != _pcmCache.end())
                {
                    ALOGV("2. Return pcm data from cache, url: %s", info.url.c_str());
                    cb(true, iter->second);
                    return;
                }
            }

            PreloadCallbackParam param;
            param.callback = cb;
            std::vector<PreloadCallbackParam> callbacks;
            callbacks.push_back(std::move(param));
            _preloadCallbackMap.insert(std::make_pair(audioFilePath, std::move(callbacks)));
        }

        _threadPool->pushTask([this, audioFilePath](int tid) {
            ALOGV("AudioPlayerProvider::preloadEffect: (%s)", audioFilePath.c_str());
            PcmData d;
            AudioDecoder decoder(_engineItf, audioFilePath, _bufferSizeInFrames, _deviceSampleRate, _fdGetterCallback);
            bool ret = decoder.start();
            if (ret)
            {
                d = decoder.getResult();
                std::lock_guard<std::mutex> lk(_pcmCacheMutex);
                _pcmCache.insert(std::make_pair(audioFilePath, d));
            }
            else
            {
                ALOGE("decode (%s) failed!", audioFilePath.c_str());
            }

            ALOGV("decode succeed.");
            std::lock_guard<std::mutex> lk(_preloadCallbackMutex);
            auto&& preloadIter = _preloadCallbackMap.find(audioFilePath);
            if (preloadIter != _preloadCallbackMap.end())
            {
                auto&& params = preloadIter->second;
                ALOGV("preload (%s) callback count: %d", audioFilePath.c_str(), params.size());
                PcmData result = decoder.getResult();
                for (auto&& param : params)
                {
                    param.callback(ret, result);
                }
                _preloadCallbackMap.erase(preloadIter);

                _preloadWaitCond.notify_one();
            }
        });
    }
    else
    {
        ALOGV("File (%s) is too large, ignore preload!", info.url.c_str());
        cb(true, pcmData);
    }
}

AudioPlayerProvider::AudioFileInfo AudioPlayerProvider::getFileInfo(
        const std::string &audioFilePath)
{
    AudioFileInfo info;
    long fileSize = 0;
    off_t start = 0, length = 0;
    int assetFd = 0;

    if (audioFilePath[0] != '/')
    {
        std::string relativePath;
        size_t position = audioFilePath.find("assets/");

        if (0 == position)
        {
            // "assets/" is at the beginning of the path and we don't want it
            relativePath = audioFilePath.substr(strlen("assets/"));
        }
        else
        {
            relativePath = audioFilePath;
        }

        assetFd = _fdGetterCallback(relativePath, &start, &length);

        if (assetFd <= 0)
        {
            ALOGE("Failed to open file descriptor for '%s'", audioFilePath.c_str());
            return info;
        }

        fileSize = length;
    }
    else
    {
        FILE *fp = fopen(audioFilePath.c_str(), "rb");
        if (fp != nullptr)
        {
            fseek(fp, 0, SEEK_END);
            fileSize = ftell(fp);
            fclose(fp);
        }
        else
        {
            return info;
        }
    }

    info.url = audioFilePath;
    info.assetFd = std::make_shared<AssetFd>(assetFd);
    info.start = start;
    info.length = fileSize;

    ALOGV("(%s) file size: %ld", audioFilePath.c_str(), fileSize);

    return info;
}

bool AudioPlayerProvider::isSmallFile(const AudioFileInfo &info)
{
    //TODO: If file size is smaller than 100k, we think it's a small file. This value should be set by developers.
    AudioFileInfo &audioFileInfo = const_cast<AudioFileInfo &>(info);
    size_t judgeCount = sizeof(__audioFileIndicator) / sizeof(__audioFileIndicator[0]);
    size_t pos = audioFileInfo.url.rfind(".");
    std::string extension;
    if (pos != std::string::npos)
    {
        extension = audioFileInfo.url.substr(pos);
    }
    auto iter = std::find_if(std::begin(__audioFileIndicator), std::end(__audioFileIndicator),
                             [&extension](const AudioFileIndicator &judge) -> bool {
                                 return judge.extension == extension;
                             });

    if (iter != std::end(__audioFileIndicator))
    {
//        ALOGV("isSmallFile: found: %s: ", iter->extension.c_str());
        return info.length < iter->smallSizeIndicator;
    }

//    ALOGV("isSmallFile: not found return default value");
    return info.length < __audioFileIndicator[0].smallSizeIndicator;
}

void AudioPlayerProvider::clearPcmCache(const std::string &audioFilePath)
{
    std::lock_guard<std::mutex> lk(_pcmCacheMutex);
    auto iter = _pcmCache.find(audioFilePath);
    if (iter != _pcmCache.end())
    {
        ALOGV("clear pcm cache: (%s)", audioFilePath.c_str());
        _pcmCache.erase(iter);
    }
    else
    {
        ALOGW("Couldn't find the pcm cache: (%s)", audioFilePath.c_str());
    }
}

void AudioPlayerProvider::clearAllPcmCaches()
{
    std::lock_guard<std::mutex> lk(_pcmCacheMutex);
    _pcmCache.clear();
}

PcmAudioPlayer *AudioPlayerProvider::obtainPcmAudioPlayer(const std::string &url,
                                                           const PcmData &pcmData)
{
    PcmAudioPlayer *pcmPlayer = nullptr;
    if (pcmData.isValid())
    {
        pcmPlayer = new(std::nothrow) PcmAudioPlayer(_mixController, _callerThreadUtils);
        if (pcmPlayer != nullptr)
        {
            pcmPlayer->prepare(url, pcmData);
        }
    }
    else
    {
        ALOGE("obtainPcmAudioPlayer failed, pcmData isn't valid!");
    }
    return pcmPlayer;
}

UrlAudioPlayer *AudioPlayerProvider::createUrlAudioPlayer(
        const AudioPlayerProvider::AudioFileInfo &info)
{
    if (info.url.empty())
    {
        ALOGE("createUrlAudioPlayer failed, url is empty!");
        return nullptr;
    }

    SLuint32 locatorType = info.assetFd > 0 ? SL_DATALOCATOR_ANDROIDFD : SL_DATALOCATOR_URI;
    auto urlPlayer = new (std::nothrow) UrlAudioPlayer(_engineItf, _outputMixObject, _callerThreadUtils);
    bool ret = urlPlayer->prepare(info.url, locatorType, info.assetFd, info.start, info.length);
    if (!ret)
    {
        SL_SAFE_DELETE(urlPlayer);
    }
    return urlPlayer;
}

void AudioPlayerProvider::pause()
{
    if (_mixController != nullptr)
    {
        _mixController->pause();
    }

    if (_pcmAudioService != nullptr)
    {
        _pcmAudioService->pause();
    }
}

void AudioPlayerProvider::resume()
{
    if (_mixController != nullptr)
    {
        _mixController->resume();
    }

    if (_pcmAudioService != nullptr)
    {
        _pcmAudioService->resume();
    }
}

}} // namespace cocos2d { namespace experimental {