Android webkit HTML5 Video Play

最新推荐文章于 2024-10-08 15:59:33 发布

ustcxiangchun

最新推荐文章于 2024-10-08 15:59:33 发布

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本文详细解析了HTML5视频在网页中播放的工作流程，从HTMLMediaElement的play方法调用开始，一直到底层MediaPlayer的启动过程。同时介绍了WebKit中Java与JNI交互实现细节，包括不同类型的HTML5VideoView使用场景及其内部计时器的工作原理。

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HTML Video Play

1.How will the HTML call video player in the webpage?

HTMLMediaElement::updatePlayState()->
HTMLMediaElement::m_player->play()->
MediaPlayer.cpp(in webkit)->play()//(this file use factory create player)->
MediaPlayerPrivateInterface->play()->
MediaPlayerPrivateAndroid.play()->android/webkit/HTML5VideoViewProxy.play()->
VideoPlayer.play(HTML5VideoViewProxy.java)->
HTML5VideoView.start()/HTML5VideoFullScreen/HTML5VideoInline.start()->
MediaPlayer.start(MediaPlayer.java)->(android_media_MediaPlayer.cpp)._start()

2. player JNI relationship in Webkit

MediaPlayerPrivateAndroid.cpp 's jni class
"android/webkit/HTML5VideoViewProxy" and "android/webkit/HTML5Audio"

There three classes in "MediaPlayerPrivateAndroid.cpp"

"MediaPlayerPrivate" as basic class;

"MediaPlayerVideoPrivate" as subclass for "android/webkit/HTML5VideoViewProxy"

"MediaPlayerVideoPrivate" as subclass for "android/webkit/HTML5Audio"

3. HTML5VideoView

in "VideoPlayer" (HTML5VideoViewProxy.java) we use "HTML5VideoView" for play.(how to use? i am finding out)

how many kinds of HTML5VideoView are used?

a."HTML5VideoView" as basic class

b."HTML5VideoFullScreen" is used for full screen playing

c."HTML5VideoInline" is used when it's not full screen.

4. Timer in HTML5VideoView

a.HTML5VideoView.start();

mTimer.schedule(new TimeupdateTask(mProxy),
 TIMEUPDATE_PERIOD, TIMEUPDATE_PERIOD);

b. in TimeupdateTask's run()

        public void run() {
            mProxy.onTimeupdate();
        }

c. in HTML5VideoViewProxy.java

    public void onTimeupdate() {
        sendMessage(obtainMessage(TIMEUPDATE));
    }

d. in HTML5VideoViewProxy.java

nativeOnTimeupdate(msg.arg1, mNativePointer);

e. finally MediaPlayerPrivateAndroid.cpp

static void OnTimeupdate(JNIEnv* env, jobject obj, int position, int pointer)
{
    if (pointer) {
        WebCore::MediaPlayerPrivate* player = reinterpret_cast<WebCore::MediaPlayerPrivate*>(pointer);
        player->onTimeupdate(position);
    }
}