OMXPlayer is an Interface Only:
-- framework/base/include/media/OMXPlayer.h
class OMXPlayer : public MediaPlayerInterface
{
public:
OMXPlayer(int nMediaType = 0);
virtual ~OMXPlayer();
virtual status_t initCheck();
virtual status_t setDataSource(const char *url, const KeyedVector *headers);
virtual status_t setDataSource(int fd, int64_t offset, int64_t length);
virtual status_t setVideoSurface(const sp& surface);
virtual status_t setVideoSurface(const android::sp& surface);
virtual status_t setVideoSurfaceTexture(const android::sp& surfaceTexture);
virtual status_t prepare();
virtual status_t prepareAsync();
virtual status_t start();
virtual status_t stop();
virtual status_t pause();
virtual bool isPlaying();
....
實做的大概是： frameworks/base/media/libmediaplayerservice/MediaPlayerService.cpp
..
實際上，這也是個空殼而已，真的 player 是在 prebuild .so 。在 device 下的 propriety/libs 下有一些 _omx_player_..
用較簡單的 Gallery 來看，啟動到最後，是 MovieView.java
這是一個 Activity，onCreate 後就直接播放影片了。
MovieView 只有實做三個 callback:
onCreate : new MovieViewControl
onPause : call MovieViewControl.onPause
onResume : call MovieViewControl.onResume
onWindowFocusChanged : call MovieViewControl.onResume/li>
Video 播放直接關聯到 VideoView 這個 layout，
在 res/layout/movie_view.xml 中放入一個 object:
<VideoView android:id="@+id/surface_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerInParent="true" />
然後在 source:
private final VideoView mVideoView;
.....
mVideoView = (VideoView) rootView.findViewById(R.id.surface_view);
取得 VideoView 元件後，就可以對 VideoView 操作：
如果有時作幾個 需要的interface，就可以接著設定：
mVideoView.setOnErrorListener(this);
mVideoView.setOnCompletionListener(this);
設定要撥的file (uri)，和 control.
mVideoView.setVideoURI(mUri);
mMediaController = new MediaController(context);
mVideoView.setMediaController(mMediaController);
然後，就可以開始播放：
mVideoView.start();
另外一個是在 development/samples/ApiDemos/src/com/example/android/apis/media/MeduaPlayerDemo_Video.java
還有有關 scanfile 的 sample code，在 development/samples 下也有...
development/samples/ApiDemos/src/com/example/android/apis/content/ExternalStorage.java
這一段code:
File path = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES);
File file = new File(path, "DemoPicture.jpg");
....
....
// Tell the media scanner about the new file so that it is
// immediately available to the user.
MediaScannerConnection.scanFile(this,
new String[] { file.toString() }, null,
new MediaScannerConnection.OnScanCompletedListener() {
public void onScanCompleted(String path, Uri uri) {
Log.i("ExternalStorage", "Scanned " + path + ":");
Log.i("ExternalStorage", "-> uri=" + uri);
}
});
所以可以把 file path 丟到這裡scan 轉成 media Uri
?
最後拿 developement/sample 的 MediaPlayerDemo_Video.java 來測試。
原來是用 file path，改成用 scan 後的 Uri。
diff 是：
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diff --git a/samples/ApiDemos/src/com/example/android/apis/media/MediaPlayerDemo_Video.java b/samples/ApiDemos/src/com/example/android/apis/media/MediaPlayerDemo_Video.java
index 9853d67..de5a1ac 100644
--- a/samples/ApiDemos/src/com/example/android/apis/media/MediaPlayerDemo_Video.java
+++ b/samples/ApiDemos/src/com/example/android/apis/media/MediaPlayerDemo_Video.java
@@ -30,9 +30,13 @@ import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.widget.Toast;
+import android.media.MediaScannerConnection;
+import android.net.Uri;
+import android.content.Context;
public class MediaPlayerDemo_Video extends Activity implements
+ MediaScannerConnection.OnScanCompletedListener,
OnBufferingUpdateListener, OnCompletionListener,
OnPreparedListener, OnVideoSizeChangedListener, SurfaceHolder.Callback {
@@ -71,14 +75,12 @@ public class MediaPlayerDemo_Video extends Activity implements
private void playVideo(Integer Media) {
doCleanUp();
- try {
-
switch (Media) {
case LOCAL_VIDEO:
/*
* TODO: Set the path variable to a local media file path.
*/
- path = "";
+ path = "/mnt/sdcard/udisk1/batman4.mp4";
if (path == "") {
// Tell the user to provide a media file URL.
Toast
@@ -118,9 +120,19 @@ public class MediaPlayerDemo_Video extends Activity implements
}
- // Create a new media player and set the listeners
+ MediaScannerConnection.scanFile(this,new String[] {path}, null,this);
+
+
+ }
+
+ public void onScanCompleted(String path, Uri uri)
+ {
+ Log.i(TAG,"path: " + path);
+ Log.i(TAG,"uri: " + uri);
+ try {
+ // Create a new media player and set the listeners
mMediaPlayer = new MediaPlayer();
- mMediaPlayer.setDataSource(path);
+ mMediaPlayer.setDataSource(getApplicationContext(),uri);
mMediaPlayer.setDisplay(holder);
mMediaPlayer.prepare();
mMediaPlayer.setOnBufferingUpdateListener(this);
@@ -161,7 +173,7 @@ public class MediaPlayerDemo_Video extends Activity implements
public void onPrepared(MediaPlayer mediaplayer) {
Log.d(TAG, "onPrepared called");
mIsVideoReadyToBePlayed = true;
- if (mIsVideoReadyToBePlayed && mIsVideoSizeKnown) {
+ if (mIsVideoReadyToBePlayed /*&& mIsVideoSizeKnown*/) {
startVideoPlayback();
}
}
