android surfaceview ffmpeg的渲染简单说明

首先在java层面中，surfaceview的显示是通过SurfaceHolder这个类中2个方法实现的：

Canvas SurfaceHolder.lockCanvas();

SurfaceHolder.unlockAndPost(Canvas canvas);

例如

1. Canvas canvas = holder.lockCanvas();  
2. canvas.drawRGB(rand.nextInt(255), rand.nextInt(255), rand.nextInt(255));  
3. holder.unlockCanvasAndPost(canvas);  

先锁定surface然后返回canvas，然后使用canvas绘制，最后再解锁并渲染到屏幕上可见。

那么在ffmpeg中渲染surfaceview只需要通过一个native方法把surface传入就行。

例如

@Override

public void surfaceCreated(SurfaceHolder holder) {

new Thread(new Runnable() {

@Override

public void run() {

play(surfaceHolder.getSurface());

}

}).start();

}

...

public native int play(Object surface);

然后在需要渲染的线程中

// 获取native window

ANativeWindow *nativeWindow = ANativeWindow_fromSurface(env, surface);

最后在每一帧要渲染处

// lock native window buffer

ANativeWindow_lock(nativeWindow, &windowBuffer, 0);

...

ANativeWindow_unlockAndPost(nativeWindow);

具体参考

http://blog.youkuaiyun.com/wangdong20/article/details/8572835

http://blog.youkuaiyun.com/King1425/article/details/71514318?locationNum=4&fps=1