Android 13 - Media框架(24)- MediaCodecList

这一节我们要了解 MediaCodecList 中的信息是如何加载的,以及这些信息是如何使用到的。

cpp 复制代码
// static
sp<IMediaCodecList> MediaCodecList::getLocalInstance() {
    Mutex::Autolock autoLock(sInitMutex);

    if (sCodecList == nullptr) {
        MediaCodecList *codecList = new MediaCodecList(GetBuilders());
        if (codecList->initCheck() == OK) {
            sCodecList = codecList;

            if (isProfilingNeeded()) {
                ALOGV("Codec profiling needed, will be run in separated thread.");
                pthread_t profiler;
                if (pthread_create(&profiler, nullptr, profilerThreadWrapper, nullptr) != 0) {
                    ALOGW("Failed to create thread for codec profiling.");
                }
            }
        } else {
            // failure to initialize may be temporary. retry on next call.
            delete codecList;
        }
    }

    return sCodecList;
}

sp<IMediaCodecList> MediaCodecList::sRemoteList;

sp<MediaCodecList::BinderDeathObserver> MediaCodecList::sBinderDeathObserver;
sp<IBinder> MediaCodecList::sMediaPlayer;  // kept since linked to death

void MediaCodecList::BinderDeathObserver::binderDied(const wp<IBinder> &who __unused) {
    Mutex::Autolock _l(sRemoteInitMutex);
    sRemoteList.clear();
    sBinderDeathObserver.clear();
}

// static
sp<IMediaCodecList> MediaCodecList::getInstance() {
    Mutex::Autolock _l(sRemoteInitMutex);
    if (sRemoteList == nullptr) {
        sMediaPlayer = defaultServiceManager()->getService(String16("media.player"));
        sp<IMediaPlayerService> service =
            interface_cast<IMediaPlayerService>(sMediaPlayer);
        if (service.get() != nullptr) {
            sRemoteList = service->getCodecList();
            if (sRemoteList != nullptr) {
                sBinderDeathObserver = new BinderDeathObserver();
                sMediaPlayer->linkToDeath(sBinderDeathObserver.get());
            }
        }
        if (sRemoteList == nullptr) {
            // if failed to get remote list, create local list
            sRemoteList = getLocalInstance();
        }
    }
    return sRemoteList;
}

MediaCodecList::MediaCodecList(std::vector<MediaCodecListBuilderBase*> builders) {
    mGlobalSettings = new AMessage();
    mCodecInfos.clear();
    MediaCodecListWriter writer;
    for (MediaCodecListBuilderBase *builder : builders) {
        if (builder == nullptr) {
            ALOGD("ignored a null builder");
            continue;
        }
        auto currentCheck = builder->buildMediaCodecList(&writer);
        if (currentCheck != OK) {
            ALOGD("ignored failed builder");
            continue;
        } else {
            mInitCheck = currentCheck;
        }
    }
    writer.writeGlobalSettings(mGlobalSettings);
    writer.writeCodecInfos(&mCodecInfos);
    std::stable_sort(
            mCodecInfos.begin(),
            mCodecInfos.end(),
            [](const sp<MediaCodecInfo> &info1, const sp<MediaCodecInfo> &info2) {
                // null is lowest
                return info1 == nullptr
                        || (info2 != nullptr && info1->getRank() < info2->getRank());
            });

    // remove duplicate entries
    bool dedupe = property_get_bool("debug.stagefright.dedupe-codecs", true);
    if (dedupe) {
        std::set<std::string> codecsSeen;
        for (auto it = mCodecInfos.begin(); it != mCodecInfos.end(); ) {
            std::string codecName = (*it)->getCodecName();
            if (codecsSeen.count(codecName) == 0) {
                codecsSeen.emplace(codecName);
                it++;
            } else {
                it = mCodecInfos.erase(it);
            }
        }
    }
}

MediaCodecList::~MediaCodecList() {
}

status_t MediaCodecList::initCheck() const {
    return mInitCheck;
}
相关推荐
aningxiaoxixi19 分钟前
Android 之 audiotrack
android
枷锁—sha21 分钟前
【DVWA系列】——CSRF——Medium详细教程
android·服务器·前端·web安全·网络安全·csrf
脑子缺根弦2 小时前
融合优势:SIP 广播对讲联动华为会议 全场景沟通响应提速
华为·音视频·广播对讲系统
Cao_Shixin攻城狮4 小时前
Flutter运行Android项目时显示java版本不兼容(Unsupported class file major version 65)的处理
android·java·flutter
呼啦啦呼啦啦啦啦啦啦7 小时前
利用pdfjs实现的pdf预览简单demo(包含翻页功能)
android·javascript·pdf
idjl9 小时前
Mysql测试题
android·adb
肥or胖11 小时前
【FFmpeg 快速入门】本地播放器 项目
开发语言·qt·ffmpeg·音视频
游戏开发爱好者811 小时前
iOS App 电池消耗管理与优化 提升用户体验的完整指南
android·ios·小程序·https·uni-app·iphone·webview
人生游戏牛马NPC1号11 小时前
学习 Flutter (四):玩安卓项目实战 - 中
android·学习·flutter
星辰也为你祝福h13 小时前
Android原生Dialog
android