android视频旋转处理方法

这几天在写视频播放器，采用surfaceview搭配mediaplayer或者VideoView进行视频播放，一切都还顺风顺水，当我播放一个方向不对的视频的时候没能自动转换成正确的方向。这时只能靠自己，将视频方向旋转90度。有想法就要开始动手了，可是不论怎么旋转，其他东西都旋转了，可是视频还是纹丝不动，百度了很久没有结果，stack overflow几分钟看不懂英文没办法，可是看到了TextureView这个类，拿来已用，进行旋转是多么的方便多么的快乐啊，终于能够正常的播放了，太开心了。

/* * Copyright (C) 2013 yixia.com * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package io.vov.vitamio.demo;import android.annotation.SuppressLint;import android.app.Activity;import android.graphics.Matrix;import android.graphics.SurfaceTexture;import android.media.AudioManager;import android.os.Bundle;import android.os.Environment;import android.util.Log;import android.view.Surface;import android.view.TextureView;import android.widget.Toast;import io.vov.vitamio.LibsChecker;import io.vov.vitamio.MediaPlayer;import io.vov.vitamio.MediaPlayer.OnBufferingUpdateListener;import io.vov.vitamio.MediaPlayer.OnCompletionListener;import io.vov.vitamio.MediaPlayer.OnPreparedListener;@SuppressLint("NewApi")public class MediaPlayerDemo_setSurface extends Activity implements OnBufferingUpdateListener,    OnCompletionListener, OnPreparedListener, TextureView.SurfaceTextureListener {  private static final String TAG = "MediaPlayerDemo";  private int mVideoWidth;  private int mVideoHeight;  private MediaPlayer mMediaPlayer;  private TextureView mTextureView;  private String path;  private Surface surf;  private boolean mIsVideoSizeKnown = false;  private boolean mIsVideoReadyToBePlayed = false;  /**   *    * Called when the activity is first created.   */  @Override  public void onCreate(Bundle icicle) {    super.onCreate(icicle);    if (!LibsChecker.checkVitamioLibs(this))      return;    setContentView(R.layout.mediaplayer_3);    mTextureView = (TextureView) findViewById(R.id.surface);    mTextureView.setSurfaceTextureListener(this);    mTextureView.setRotation(90);  }  @SuppressLint("NewApi")  private void playVideo(SurfaceTexture surfaceTexture) {    doCleanUp();    try {      path = Environment.getExternalStorageDirectory()+"/"+"1.mp4";      if (path == "") {        // Tell the user to provide a media file URL.        Toast.makeText(            MediaPlayerDemo_setSurface.this,            "Please edit MediaPlayerDemo_setSurface Activity, "                + "and set the path variable to your media file path."                + " Your media file must be stored on sdcard.", Toast.LENGTH_LONG).show();        return;      }      // Create a new media player and set the listeners      mMediaPlayer = new MediaPlayer(this, true);      mMediaPlayer.setDataSource(path);      if (surf == null) {          surf = new Surface (surfaceTexture);      }      mMediaPlayer.setSurface(surf);      mMediaPlayer.prepareAsync();      mMediaPlayer.setOnBufferingUpdateListener(this);      mMediaPlayer.setOnCompletionListener(this);      mMediaPlayer.setOnPreparedListener(this);      setVolumeControlStream(AudioManager.STREAM_MUSIC);    } catch (Exception e) {      Log.e(TAG, "error: " + e.getMessage(), e);    }  }  public void onBufferingUpdate(MediaPlayer arg0, int percent) {    // Log.d(TAG, "onBufferingUpdate percent:" + percent);  }  public void onCompletion(MediaPlayer arg0) {    Log.d(TAG, "onCompletion called");  }  public void onPrepared(MediaPlayer mediaplayer) {    Log.d(TAG, "onPrepared called");    mIsVideoReadyToBePlayed = true;    if (mIsVideoReadyToBePlayed) {      startVideoPlayback();    }  }  @Override  protected void onPause() {    super.onPause();    releaseMediaPlayer();    doCleanUp();  }  @Override  protected void onDestroy() {    super.onDestroy();    releaseMediaPlayer();    doCleanUp();  }  private void releaseMediaPlayer() {    if (mMediaPlayer != null) {      mMediaPlayer.release();      mMediaPlayer = null;    }  }  private void doCleanUp() {    mVideoWidth = 0;    mVideoHeight = 0;    mIsVideoReadyToBePlayed = false;    mIsVideoSizeKnown = false;  }  private void startVideoPlayback() {    Log.v(TAG, "startVideoPlayback");    adjustAspectRatio(mMediaPlayer.getVideoWidth(), mMediaPlayer.getVideoHeight());    mMediaPlayer.start();  }  /**   * Sets the TextureView transform to preserve the aspect ratio of the video.   */  private void adjustAspectRatio(int videoWidth, int videoHeight) {    int viewWidth = mTextureView.getWidth();    int viewHeight = mTextureView.getHeight();    double aspectRatio = (double) videoHeight / videoWidth;    int newWidth, newHeight;    if (viewHeight > (int) (viewWidth * aspectRatio)) {      // limited by narrow width; restrict height      newWidth = viewWidth;      newHeight = (int) (viewWidth * aspectRatio);    } else {      // limited by short height; restrict width      newWidth = (int) (viewHeight / aspectRatio);      newHeight = viewHeight;    }    int xoff = (viewWidth - newWidth) / 2;    int yoff = (viewHeight - newHeight) / 2;    Log.v(TAG, "video=" + videoWidth + "x" + videoHeight + " view=" + viewWidth + "x" + viewHeight        + " newView=" + newWidth + "x" + newHeight + " off=" + xoff + "," + yoff);    Matrix txform = new Matrix();    mTextureView.getTransform(txform);    txform.setScale((float) newWidth / viewWidth, (float) newHeight / viewHeight);    //txform.postRotate(10);          // just for fun    txform.postTranslate(xoff, yoff);    mTextureView.setTransform(txform);  }  @Override  public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {    playVideo(surface);  }  @Override  public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {  }  @Override  public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {    return false;  }  @Override  public void onSurfaceTextureUpdated(SurfaceTexture surface) {  }}

TextureView类的介绍。http://www.bubuko.com/infodetail-656030.html

更新后的代码

/* * Copyright (C) 2013 yixia.com * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package io.vov.vitamio.demo;import android.annotation.SuppressLint;import android.app.Activity;import android.graphics.Matrix;import android.graphics.SurfaceTexture;import android.media.AudioManager;import android.os.Bundle;import android.os.Environment;import android.util.Log;import android.view.Surface;import android.view.TextureView;import android.widget.Toast;import io.vov.vitamio.LibsChecker;import io.vov.vitamio.MediaPlayer;import io.vov.vitamio.MediaPlayer.OnBufferingUpdateListener;import io.vov.vitamio.MediaPlayer.OnCompletionListener;import io.vov.vitamio.MediaPlayer.OnPreparedListener;@SuppressLint("NewApi")public class MediaPlayerDemo_setSurface extends Activity implements OnBufferingUpdateListener,    OnCompletionListener, OnPreparedListener, TextureView.SurfaceTextureListener {  private static final String TAG = "MediaPlayerDemo";  private int mVideoWidth;  private int mVideoHeight;  private MediaPlayer mMediaPlayer;  private TextureView mTextureView;  private String path;  private Surface surf;  private boolean mIsVideoSizeKnown = false;  private boolean mIsVideoReadyToBePlayed = false;  /**   *    * Called when the activity is first created.   */  @Override  public void onCreate(Bundle icicle) {    super.onCreate(icicle);    if (!LibsChecker.checkVitamioLibs(this))      return;    setContentView(R.layout.mediaplayer_3);    mTextureView = (TextureView) findViewById(R.id.surface);    mTextureView.setSurfaceTextureListener(this);    mTextureView.setRotation(90);    mTextureView.setScaleX(1280f/720);    mTextureView.setScaleY(720f/1280);  }  @SuppressLint("NewApi")  private void playVideo(SurfaceTexture surfaceTexture) {    doCleanUp();    try {      path = Environment.getExternalStorageDirectory()+"/"+"1.mp4";      if (path == "") {        // Tell the user to provide a media file URL.        Toast.makeText(            MediaPlayerDemo_setSurface.this,            "Please edit MediaPlayerDemo_setSurface Activity, "                + "and set the path variable to your media file path."                + " Your media file must be stored on sdcard.", Toast.LENGTH_LONG).show();        return;      }      // Create a new media player and set the listeners      mMediaPlayer = new MediaPlayer(this, true);      mMediaPlayer.setDataSource(path);      if (surf == null) {          surf = new Surface (surfaceTexture);      }      mMediaPlayer.setSurface(surf);      mMediaPlayer.prepareAsync();      mMediaPlayer.setOnBufferingUpdateListener(this);      mMediaPlayer.setOnCompletionListener(this);      mMediaPlayer.setOnPreparedListener(this);      setVolumeControlStream(AudioManager.STREAM_MUSIC);    } catch (Exception e) {      Log.e(TAG, "error: " + e.getMessage(), e);    }  }  public void onBufferingUpdate(MediaPlayer arg0, int percent) {    // Log.d(TAG, "onBufferingUpdate percent:" + percent);  }  public void onCompletion(MediaPlayer arg0) {    Log.d(TAG, "onCompletion called");  }  public void onPrepared(MediaPlayer mediaplayer) {    Log.d(TAG, "onPrepared called");    mIsVideoReadyToBePlayed = true;    if (mIsVideoReadyToBePlayed) {      startVideoPlayback();    }  }  @Override  protected void onPause() {    super.onPause();    releaseMediaPlayer();    doCleanUp();  }  @Override  protected void onDestroy() {    super.onDestroy();    releaseMediaPlayer();    doCleanUp();  }  private void releaseMediaPlayer() {    if (mMediaPlayer != null) {      mMediaPlayer.release();      mMediaPlayer = null;    }  }  private void doCleanUp() {    mVideoWidth = 0;    mVideoHeight = 0;    mIsVideoReadyToBePlayed = false;    mIsVideoSizeKnown = false;  }  private void startVideoPlayback() {    Log.v(TAG, "startVideoPlayback");    mMediaPlayer.start();  }  @Override  public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {    playVideo(surface);  }  @Override  public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {  }  @Override  public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {    return false;  }  @Override  public void onSurfaceTextureUpdated(SurfaceTexture surface) {  }}