添加截取视频图片帧的方法

app/src/main/java/com/sheep/gamegroup/util/FileUtil.java

@@ -1,5 +1,6 @@
 package com.sheep.gamegroup.util;
 
+import android.net.Uri;
 import android.text.TextUtils;
 
 import com.sheep.jiuyan.samllsheep.BuildConfig;
@@ -178,6 +179,7 @@ public class FileUtil {
         }
         return filename;
     }
+
     /*
      * Java文件操作 获取带扩展名的文件名
      * */
@@ -195,7 +197,8 @@ public class FileUtil {
 
     /**
      * 获取文件名，带扩展名
-     * @param filename 前提是fileName前面一定没有/
+     *
+     * @param filename  前提是fileName前面一定没有/
      * @param defaultEx 默认的扩展
      * @return
      */
@@ -212,9 +215,26 @@ public class FileUtil {
     }
 
 
-
-
-
+    /**
+     * 获取文件名称且不带扩展名
+     *
+     * @param filePath
+     * @return
+     */
+    public static String getFileNameNoExFromPath(String filePath) {
+        if ((filePath != null) && (filePath.length() > 0)) {
+            Uri uri = Uri.parse(filePath);
+            String lastPathSegment = uri.getLastPathSegment();
+            if (lastPathSegment != null) {
+                int dot = lastPathSegment.lastIndexOf('.');
+                if (dot > 0) {
+                    return lastPathSegment.substring(0, dot);
+                }
+                return lastPathSegment;
+            }
+        }
+        return filePath;
+    }
 
 
     /**
@@ -225,6 +245,7 @@ public class FileUtil {
     public static void deleteFiles(File pDir) {
         deleteFiles(pDir, true);
     }
+
     /**
      * 递归删除文件或文件夹。
      *

app/src/main/java/com/sheep/gamegroup/util/MediaMetadataRetrieverUtil.java

@@ -0,0 +1,106 @@
+package com.sheep.gamegroup.util;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.media.MediaMetadataRetriever;
+
+import com.sheep.gamegroup.absBase.AbsObserver;
+import com.sheep.jiuyan.samllsheep.SheepApp;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Locale;
+
+import io.reactivex.Observable;
+import io.reactivex.ObservableEmitter;
+import io.reactivex.ObservableOnSubscribe;
+import io.reactivex.ObservableSource;
+import io.reactivex.android.schedulers.AndroidSchedulers;
+import io.reactivex.functions.Function;
+import io.reactivex.schedulers.Schedulers;
+
+/**
+ * Created by realicing on 2018/11/29.
+ * realicing@sina.com
+ * 可以获取视频帧
+ */
+public class MediaMetadataRetrieverUtil {
+    private static final String TAG = "MediaMetadataRetrieverUtil";
+
+    public static String getFilePath(String fromFile, String outDir, int index) {
+        return String.format(Locale.CHINA, "%s%s%s_frame_%d.png", outDir, File.separator, FileUtil.getFileNameNoExFromPath(fromFile), index);
+    }
+
+
+    /**
+     * 取出视频文件中的图片帧列表
+     *
+     * @param fromFile 要操作的本地视频文件
+     * @param duration 单位毫秒
+     * @param size     需要的图片个数
+     * @return
+     */
+    public static void tryGetFrameFileList(final String fromFile, final long duration, final int size, AbsObserver<List<String>> absObserver) {
+        Observable.create(new ObservableOnSubscribe<List<String>>() {
+                    @Override
+                    public void subscribe(ObservableEmitter<List<String>> emitter) throws Exception {
+                        emitter.onNext(getFrameFileList(fromFile, SheepApp.getInstance().getDir("frame", Context.MODE_PRIVATE).getAbsolutePath(), duration, size));
+                    }
+                })
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe(absObserver);
+
+    }
+
+    /**
+     * 取出视频文件中的图片帧列表
+     *
+     * @param fromFile 要操作的本地视频文件
+     * @param outDir   输出路径
+     * @param duration 单位毫秒
+     * @param size     需要的图片个数
+     * @return
+     */
+    public static List<String> getFrameFileList(String fromFile, String outDir, long duration, int size) {
+        if (duration < size || size < 1) {
+            return null;
+        }
+        long per = duration * 1000L / (size - 1);
+        List<String> resultList = new ArrayList<>();
+        long time = System.currentTimeMillis();
+        MediaMetadataRetriever metadataRetriever = new MediaMetadataRetriever();
+        metadataRetriever.setDataSource(fromFile);
+
+        for (int i = 0; i < size; i++) {
+            //这里单位为微秒
+            long atTime = i + 1 == size ? (duration * 1000L) : i * per;
+            Bitmap bitmap = metadataRetriever.getFrameAtTime(atTime, MediaMetadataRetriever.OPTION_CLOSEST);
+
+            String path = getFilePath(outDir, fromFile, i);
+            FileOutputStream fileOutputStream = null;
+            try {
+                fileOutputStream = new FileOutputStream(path);
+                bitmap.compress(Bitmap.CompressFormat.PNG, 90, fileOutputStream);
+                resultList.add(path);
+            } catch (Exception e) {
+                e.printStackTrace();
+            } finally {
+                if (fileOutputStream != null) {
+                    try {
+                        fileOutputStream.close();
+                    } catch (IOException e) {
+                        e.printStackTrace();
+                    }
+                }
+            }
+            bitmap.recycle();
+        }
+        long curTime = System.currentTimeMillis();
+        LogUtil.println(TAG, time, curTime, curTime - time, (curTime - time) / 1000, (curTime - time) / 10000);
+        return resultList;
+    }
+}