学步园

1.How will the HTML call video player in the webpage? (from dom parsing to mediaplayer)

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);
    }
}

f. HTMLMediaElement::mediaPlayerTimeChanged (why is this, i am trying to find out)