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
lichong9511 小时前
【混合开发】Android+WebView视频图片播放硬件加速详解
android·音视频
future_studio4 小时前
如何用 Kotlin 在 Android 手机开发一个应用程序获取国家或地区信息
android·智能手机·kotlin
future_studio4 小时前
如何用 Kotlin 在 Android 手机开发一个计算器
android
魔芋红茶8 小时前
MySQL 从入门到精通 16:主从复制
android·mysql·adb
2501_9151063210 小时前
移动端网页调试实战,iOS WebKit Debug Proxy 的应用与替代方案
android·前端·ios·小程序·uni-app·iphone·webkit
柯南二号11 小时前
【大前端】React Native 调用 Android、iOS 原生能力封装
android·前端·react native
可乐+冰011 小时前
Android 编写高斯模糊功能
android·人工智能·opencv
iphone10812 小时前
企业内部机密视频安全保护|如何防止企业内部机密视频泄露?
安全·音视频·视频加密·加密技术·视频安全·企业机密·机密视频
xzkyd outpaper14 小时前
Android中APK包含哪些内容?
android
蹦极的考拉14 小时前
网站日志里面老是出现{pboot:if((\x22file_put_co\x22.\x22ntents\x22)(\x22temp.php\x22.....
android·开发语言·php