havlenapetr-FFMpeg OnVideoSizeChangedListener接口的实现

moruite在他的文章http://blog.csdn.net/moruite/article/details/6305944里说到了用havlenapetr-FFMpeg播放视频花屏的问题，需要自己实现OnVideoSizeChangedListener接口。网上没有找到相关的资料，自己研究了下。秉着OpenSource的观念，取之于havlenapetr-FFMpeg，还给世界。

 

FFMpegPlayer中添加如下接口和变量：

 // Add by yarpee start
 /**
  * Interface definition of a callback to be invoked when the
  * video size is first known or updated
  */
 public interface OnVideoSizeChangedListener
 {
     /**
      * Called to indicate the video size
      *
      * @param mp        the MediaPlayer associated with this callback
      * @param width     the width of the video
      * @param height    the height of the video
      */
     public void onVideoSizeChanged(FFMpegPlayer mp, int width, int height);
 }

 /**
  * Register a callback to be invoked when the video size is
  * known or updated.
  *
  * @param listener the callback that will be run
  */
 public void setOnVideoSizeChangedListener(OnVideoSizeChangedListener listener)
 {
     Log.d(TAG, "setOnVideoSizeChangedListener");
     mOnVideoSizeChangedListener = listener;
 }

 private static OnVideoSizeChangedListener mOnVideoSizeChangedListener;
 // Add by yarpee end

FFMpegPlayer中修改如下函数：

 private static void postEventFromNative(Object mediaplayer_ref,
                                         int what, int arg1, int arg2, Object obj)
 {
     switch(what) {
     case MEDIA_INFO_FRAMERATE_VIDEO:
         Log.d(TAG, "Video fps:" + arg1);
         break;
     case MEDIA_INFO_FRAMERATE_AUDIO:
         Log.d(TAG, "Audio fps:" + arg1);
         break;
     case MEDIA_SET_VIDEO_SIZE:
         Log.d(TAG, "Video width:" + arg1 + " height:" + arg2);
         if(mOnVideoSizeChangedListener != null)
         {
             Log.d(TAG, "mOnVideoSizeChangedListener != null");
             mOnVideoSizeChangedListener.onVideoSizeChanged(null, arg1, arg2);
         }
         else
         {
             Log.d(TAG, "mOnVideoSizeChangedListener == null");
         }
     }
 }

FFMpegMovieViewAndroid中修改如下函数：

   private void openVideo(SurfaceHolder surfHolder) {
     try {
         mPlayer.setDisplay(surfHolder);

     // Add by yarpee
         // 必须在prepare前设置listener
     mPlayer.setOnVideoSizeChangedListener(new FFMpegPlayer.OnVideoSizeChangedListener()
     {
         public void onVideoSizeChanged(FFMpegPlayer mp, int width, int height)
         {
             // 注意此处不能用mp，mp为null
             int videoWidth = mPlayer.getVideoWidth();
             int videoHeight = mPlayer.getVideoHeight();
             if(videoHeight != 0 && videoWidth != 0)
             {
                 Log.d(TAG, "setFixedSize width:" + videoWidth + " height:" + videoHeight);
                 getHolder().setFixedSize(videoWidth, videoHeight);
             }
         }
     });

         mPlayer.prepare();
 } catch (IllegalStateException e) {
     Log.e(TAG, "Couldn't prepare player: " + e.getMessage());
 } catch (IOException e) {
     Log.e(TAG, "Couldn't prepare player: " + e.getMessage());
 }
   }

C代码修改Mediaplayer.cpp中的如下函数：

 status_t MediaPlayer::prepare()
 {
     status_t ret;
     mCurrentState = MEDIA_PLAYER_PREPARING;
     av_log_set_callback(ffmpegNotify);
     if ((ret = prepareVideo()) != NO_ERROR) {
         mCurrentState = MEDIA_PLAYER_STATE_ERROR;
         return ret;
     }
     if ((ret = prepareAudio()) != NO_ERROR) {
         mCurrentState = MEDIA_PLAYER_STATE_ERROR;
         return ret;
     }
     mCurrentState = MEDIA_PLAYER_PREPARED;

     // Add by yarpee
     notify(5, mVideoWidth, mVideoHeight);

     return NO_ERROR;
 }