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在android中进行视频的分割

分类： Android平台

2014-03-06 23:53:47

原文地址：在android中进行视频的分割 作者：云少嘎嘎嘎

      最近项目有个需求要对录制的视频进行分割，查了很多资料，看到ffmpeg可以对视频进行分割。上网找到别人基于android的开源ffmpeg，终于编译成功ffmpeg.so。但是要使用的话还要查ffmpeg的api，并且写jni的调用接口，非常麻烦。偶然情况下发现了开源软件mp4parser:  一款非常棒的开源软件，可以对视频进行分割、组合等操作，而且使用起来非常简单。通过svn对其下载后可以看到里面带着视频分割的例子，但是是用java实现，将其稍微修改一下就可以用在Android上了。

      首先将例子中的代码修改为一个工具类，通过接口传进视频文件的路径和截取视频的开始、结束时间。需要注意的是，如果传的开始时间是10s，视频一般不会刚好是从10s开始的，要根据视频的关键帧做一下调整。截取出来的视频会放到存储卡的Clip目录下。代码如下：

点击(此处)折叠或打开

  1. package com.example.mp4clip;

  3. import java.io.File;
  4. import java.io.FileOutputStream;
  5. import java.io.IOException;
  6. import java.nio.channels.FileChannel;
  7. import java.util.Arrays;
  8. import java.util.LinkedList;
  9. import java.util.List;

  11. import android.os.Environment;
  12. import android.util.Log;

  14. import com.coremedia.iso.boxes.Container;
  15. import com.googlecode.mp4parser.authoring.Movie;
  16. import com.googlecode.mp4parser.authoring.Track;
  17. import com.googlecode.mp4parser.authoring.builder.DefaultMp4Builder;
  18. import com.googlecode.mp4parser.authoring.container.mp4.MovieCreator;
  19. import com.googlecode.mp4parser.authoring.tracks.CroppedTrack;

  21. public class ClipUtil {
  22.     private static final String TAG = "ClipUtil";

  24.     /**
  25.      * 截取指定时间段的视频
  26.      * @param path 视频的路径
  27.      * @param begin 需要截取的开始时间
  28.      * @param end 截取的结束时间
  29.      * @throws IOException
  30.      */
  31.     public static void clipVideo(String path, double begin, double end)
  32.             throws IOException {
  33.         File mSdCardDir = Environment.getExternalStorageDirectory();
  34.         File f = new File(mSdCardDir.getAbsolutePath() + File.separator
  35.                 + Util.SAVE_PATH);
  36.         if (!f.exists()) {
  37.             f.mkdir();
  38.         }
  39.         // Movie movie = new MovieCreator().build(new
  40.         // RandomAccessFile("/home/sannies/suckerpunch-distantplanet_h1080p/suckerpunch-distantplanet_h1080p.mov",
  41.         // "r").getChannel());
  42.         Movie movie = MovieCreator.build(path);

  44.         List<Track> tracks = movie.getTracks();
  45.         movie.setTracks(new LinkedList<Track>());
  46.         // remove all tracks we will create new tracks from the old

  48.         double startTime1 = begin;
  49.         double endTime1 = end;
  50.         // double startTime2 = 30;
  51.         // double endTime2 = 40;

  53.         boolean timeCorrected = false;

  55.         // Here we try to find a track that has sync samples. Since we can only
  56.         // start decoding
  57.         // at such a sample we SHOULD make sure that the start of the new
  58.         // fragment is exactly
  59.         // such a frame
  60.         for (Track track : tracks) {
  61.             if (track.getSyncSamples() != null
  62.                     && track.getSyncSamples().length > 0) {
  63.                 if (timeCorrected) {
  64.                     // This exception here could be a false positive in case we
  65.                     // have multiple tracks
  66.                     // with sync samples at exactly the same positions. E.g. a
  67.                     // single movie containing
  68.                     // multiple qualities of the same video (Microsoft Smooth
  69.                     // Streaming file)
  70.                     Log.e(TAG,
  71.                             "The startTime has already been corrected by another track with SyncSample. Not Supported.");
  72.                     throw new RuntimeException(
  73.                             "The startTime has already been corrected by another track with SyncSample. Not Supported.");
  74.                 }
  75.                 startTime1 = correctTimeToSyncSample(track, startTime1, false);
  76.                 endTime1 = correctTimeToSyncSample(track, endTime1, true);
  77.                 // startTime2 = correctTimeToSyncSample(track, startTime2,
  78.                 // false);
  79.                 // endTime2 = correctTimeToSyncSample(track, endTime2, true);
  80.                 timeCorrected = true;
  81.             }
  82.         }

  84.         for (Track track : tracks) {
  85.             long currentSample = 0;
  86.             double currentTime = 0;
  87.             double lastTime = 0;
  88.             long startSample1 = -1;
  89.             long endSample1 = -1;
  90.             // long startSample2 = -1;
  91.             // long endSample2 = -1;

  93.             for (int i = 0; i < track.getSampleDurations().length; i++) {
  94.                 long delta = track.getSampleDurations()[i];

  96.                 if (currentTime > lastTime && currentTime <= startTime1) {
  97.                     // current sample is still before the new starttime
  98.                     startSample1 = currentSample;
  99.                 }
  100.                 if (currentTime > lastTime && currentTime <= endTime1) {
  101.                     // current sample is after the new start time and still
  102.                     // before the new endtime
  103.                     endSample1 = currentSample;
  104.                 }
  105.                 // if (currentTime > lastTime && currentTime <= startTime2) {
  106.                 // // current sample is still before the new starttime
  107.                 // startSample2 = currentSample;
  108.                 // }
  109.                 // if (currentTime > lastTime && currentTime <= endTime2) {
  110.                 // // current sample is after the new start time and still
  111.                 // before the new endtime
  112.                 // endSample2 = currentSample;
  113.                 // }
  114.                 lastTime = currentTime;
  115.                 currentTime += (double) delta
  116.                         / (double) track.getTrackMetaData().getTimescale();
  117.                 currentSample++;
  118.             }
  119.             movie.addTrack(new CroppedTrack(track, startSample1, endSample1));// new
  120.                                                                                 // AppendTrack(new
  121.                                                                                 // CroppedTrack(track,
  122.                                                                                 // startSample1,
  123.                                                                                 // endSample1),
  124.                                                                                 // new
  125.                                                                                 // CroppedTrack(track,
  126.                                                                                 // startSample2,
  127.                                                                                 // endSample2)));
  128.         }
  129.         long start1 = System.currentTimeMillis();
  130.         Container out = new DefaultMp4Builder().build(movie);
  131.         long start2 = System.currentTimeMillis();
  132.         FileOutputStream fos = new FileOutputStream(f.getAbsolutePath()
  133.                 + File.separator
  134.                 + String.format("output-%f-%f.mp4", startTime1, endTime1));
  135.         FileChannel fc = fos.getChannel();
  136.         out.writeContainer(fc);

  138.         fc.close();
  139.         fos.close();
  140.         long start3 = System.currentTimeMillis();
  141.         Log.e(TAG, "Building IsoFile took : " + (start2 - start1) + "ms");
  142.         Log.e(TAG, "Writing IsoFile took : " + (start3 - start2) + "ms");
  143.         Log.e(TAG,
  144.                 "Writing IsoFile speed : "
  145.                         + (new File(String.format("output-%f-%f.mp4",
  146.                                 startTime1, endTime1)).length()
  147.                                 / (start3 - start2) / 1000) + "MB/s");
  148.     }

  150.     private static double correctTimeToSyncSample(Track track, double cutHere,
  151.             boolean next) {
  152.         double[] timeOfSyncSamples = new double[track.getSyncSamples().length];
  153.         long currentSample = 0;
  154.         double currentTime = 0;
  155.         for (int i = 0; i < track.getSampleDurations().length; i++) {
  156.             long delta = track.getSampleDurations()[i];

  158.             if (Arrays.binarySearch(track.getSyncSamples(), currentSample + 1) >= 0) {
  159.                 // samples always start with 1 but we start with zero therefore
  160.                 // +1
  161.                 timeOfSyncSamples[Arrays.binarySearch(track.getSyncSamples(),
  162.                         currentSample + 1)] = currentTime;
  163.             }
  164.             currentTime += (double) delta
  165.                     / (double) track.getTrackMetaData().getTimescale();
  166.             currentSample++;

  168.         }
  169.         double previous = 0;
  170.         for (double timeOfSyncSample : timeOfSyncSamples) {
  171.             if (timeOfSyncSample > cutHere) {
  172.                 if (next) {
  173.                     return timeOfSyncSample;
  174.                 } else {
  175.                     return previous;
  176.                 }
  177.             }
  178.             previous = timeOfSyncSample;
  179.         }
  180.         return timeOfSyncSamples[timeOfSyncSamples.length - 1];
  181.     }

  183. }
     

         有了工具类，下面就是增加一个操作界面了。我用一个列表列出所有的视频，点击视频后就会在后台截取出5s~15s总共10s的视频。当然也可以根据需要加上自己想要的开始结束时间，代码如下：


点击(此处)折叠或打开

  1. package com.example.mp4clip;

  3. import java.io.IOException;
  4. import java.lang.ref.SoftReference;

  6. import android.app.Activity;
  7. import android.content.Context;
  8. import android.content.Intent;
  9. import android.database.Cursor;
  10. import android.graphics.drawable.Drawable;
  11. import android.net.Uri;
  12. import android.os.Bundle;
  13. import android.os.Environment;
  14. import android.provider.MediaStore;
  15. import android.util.Log;
  16. import android.util.SparseArray;
  17. import android.view.Menu;
  18. import android.view.MenuItem;
  19. import android.view.View;
  20. import android.view.ViewGroup;
  21. import android.widget.AdapterView;
  22. import android.widget.AdapterView.OnItemClickListener;
  23. import android.widget.ImageView;
  24. import android.widget.ListView;
  25. import android.widget.SimpleCursorAdapter;
  26. import android.widget.TextView;
  27. import edu.mit.mobile.android.imagecache.ImageCache;
  28. import edu.mit.mobile.android.imagecache.ImageCache.OnImageLoadListener;

  30. public class MainActivity extends Activity implements OnItemClickListener,
  31.         OnImageLoadListener {

  33.     private static final String TAG = "MainActivity";
  34.     ListView mList;
  35.     private Cursor mCursor;
  36.     private final SparseArray<SoftReference<ImageView>> mImageViewsToLoad = new SparseArray<SoftReference<ImageView>>();
  37.     private ImageCache mCache;

  39.     @Override
  40.     protected void onCreate(Bundle savedInstanceState) {
  41.         super.onCreate(savedInstanceState);
  42.         setContentView(R.layout.activity_main);
  43.         mCache = ImageCache.getInstance(this);
  44.         mCache.registerOnImageLoadListener(this);
  45.         mList = (ListView) findViewById(R.id.list);
  46.         mList.setOnItemClickListener(this);
  47.         mCursor = getContentResolver().query(
  48.                 MediaStore.Video.Media.EXTERNAL_CONTENT_URI, null, null, null,
  49.                 MediaStore.Video.Media.DATE_MODIFIED + " desc");
  50.         SimpleCursorAdapter adapter = new videoListAdapter(this,
  51.                 R.layout.video_listitem, mCursor,
  52.                 new String[] { MediaStore.Video.Media.TITLE },
  53.                 new int[] { R.id.video_title });
  54.         mList.setAdapter(adapter);
  55.     }

  57.     @Override
  58.     public boolean onCreateOptionsMenu(Menu menu) {
  59.         getMenuInflater().inflate(R.menu.main, menu);
  60.         return true;
  61.     }

  63.     public boolean onOptionsItemSelected(MenuItem item) {
  64.         // 扫描新多媒体文件,添加到数据库中
  65.         sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,
  66.                 Uri.parse("file://"
  67.                         + Environment.getExternalStorageDirectory()
  68.                                 .getAbsolutePath())));
  69.         return false;
  70.     }

  72.     @Override
  73.     public void onItemClick(AdapterView<?> parent, View view, int position,
  74.             long id) {
  75.         if (mCursor.moveToPosition(position)) {
  76.             int index = -1;
  77.             index = mCursor.getColumnIndex(MediaStore.Video.Media.DATA);
  78.             String path = null;
  79.             if (index >= 0) {
  80.                 path = mCursor.getString(index);
  81.                 try {
  82.                     ClipUtil.clipVideo(path, 5, 15);
  83.                 } catch (IOException e) {
  84.                     // TODO Auto-generated catch block
  85.                     e.printStackTrace();
  86.                 }
  87.             }
  88.         }

  90.     }

  92.     private static final class ViewHolder {
  93.         /** 视频名称 */
  94.         TextView titleView;
  95.         /** 视频时长 */
  96.         TextView durationView;
  97.         /** 文件大小 */
  98.         TextView sizeView;
  99.     }

  101.     private class videoListAdapter extends SimpleCursorAdapter {

  103.         /*
  104.          * constructor.
  105.          */
  106.         public videoListAdapter(Context context, int layout, Cursor c,
  107.                 String[] from, int[] to) {
  108.             super(context, layout, c, from, to);
  109.         }

  111.         @Override
  112.         public int getCount() {
  113.             return super.getCount();
  114.         }

  116.         @Override
  117.         public Object getItem(int position) {
  118.             return super.getItem(position);
  119.         }

  121.         @Override
  122.         public long getItemId(int position) {
  123.             return super.getItemId(position);
  124.         }

  126.         @Override
  127.         public View getView(int position, View convertView, ViewGroup parent) {
  128.             View view = super.getView(position, convertView, parent);
  129.             Cursor cursor = getCursor();
  130.             cursor.moveToPosition(position);
  131.             ViewHolder holder = (ViewHolder) view.getTag();
  132.             if (holder == null) {
  133.                 holder = new ViewHolder();
  134.                 holder.titleView = (TextView) view
  135.                         .findViewById(R.id.video_title);
  136.                 holder.durationView = (TextView) view
  137.                         .findViewById(R.id.video_duration);
  138.                 holder.sizeView = (TextView) view.findViewById(R.id.video_size);
  139.             }
  140.             view.setTag(holder);
  141.             final ImageView iv = (ImageView) view.findViewById(R.id.thumbnail);
  142.             int index = -1;
  143.             index = mCursor.getColumnIndex(MediaStore.Video.Media.DATA);
  144.             String path = null;
  145.             if (index >= 0) {
  146.                 path = mCursor.getString(index);
  147.                 try {
  148.                     Drawable draw = mCache.loadImage(position, Uri.parse(path),
  149.                             120, 120);
  150.                     if (draw != null) {
  151.                         iv.setBackground(draw);
  152.                     } else {
  153.                         mImageViewsToLoad.put(position,
  154.                                 new SoftReference<ImageView>(iv));
  155.                     }
  156.                 } catch (IOException e) {
  157.                     e.printStackTrace();
  158.                 }
  159.             }
  160.             index = -1;
  161.             index = cursor.getColumnIndex(MediaStore.Video.Media.TITLE);
  162.             String title = null;
  163.             if (index >= 0) {
  164.                 title = cursor.getString(index);
  165.                 holder.titleView.setText(title);
  166.             }
  167.             index = -1;
  168.             index = cursor.getColumnIndex(MediaStore.Video.Media.DURATION);
  169.             int duration;
  170.             if (index >= 0) {
  171.                 duration = cursor.getInt(index);
  172.                 holder.durationView.setText(Util.durationFormat(duration));
  173.             }
  174.             index = -1;
  175.             index = cursor.getColumnIndex(MediaStore.Video.Media.SIZE);
  176.             long size;
  177.             if (index >= 0) {
  178.                 size = cursor.getLong(index);
  179.                 holder.sizeView.setText(Util.sizeFormat(size));
  180.             }
  181.             return view;

  183.         }

  185.     }

  187.     @Override
  188.     public void onImageLoaded(int id, Uri imageUri, Drawable image) {
  189.         Log.d(TAG, "onImageLoaded:" + id);
  190.         final SoftReference<ImageView> ivRef = mImageViewsToLoad.get(id);
  191.         if (ivRef == null) {
  192.             Log.d(TAG, "ivRef=null");
  193.             return;
  194.         }
  195.         final ImageView iv = ivRef.get();
  196.         if (iv == null) {
  197.             Log.d(TAG, "ivRef=null");
  198.             mImageViewsToLoad.remove(id);
  199.             return;
  200.         }
  201.         iv.setBackground(image);
  202.     }
  203. }







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