havlenapetr-FFMpeg OnVideoSizeChangedListener接口的实现

转载自：http://blog.csdn.net/yarpee/article/details/6910877

moruite在他的文章/article/2776576.html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;
}