Java tutorial
/* Copyright 2014 Sebible Limited 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 com.sebible.cordova.videosnapshot; import java.io.FileOutputStream; import java.io.FileInputStream; import java.io.BufferedInputStream; import java.util.ArrayList; import java.io.File; import java.lang.Exception; import android.media.MediaMetadataRetriever; import android.util.Log; import android.os.Environment; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.Rect; import android.graphics.Color; import android.graphics.PorterDuffXfermode; import android.graphics.PorterDuff; import android.net.Uri; import org.apache.cordova.CallbackContext; import org.apache.cordova.CordovaPlugin; import org.apache.cordova.LOG; import org.apache.cordova.PluginResult; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; public class VideoSnapshot extends CordovaPlugin { private CallbackContext callbackContext; @Override public boolean execute(String action, JSONArray args, CallbackContext callbackContext) throws JSONException { String source = ""; int count = 1; this.callbackContext = callbackContext; JSONObject options = args.optJSONObject(0); if (options == null) { fail("No options provided"); return false; } if (action.equals("snapshot")) { // Run async snapshot(options); return true; } return false; } private void drawTimestamp(Bitmap bm, String prefix, long timeMs, int textSize) { float w = bm.getWidth(), h = bm.getHeight(); float size = (float) (textSize * bm.getWidth()) / 1280; float margin = (float) (w < h ? w : h) * 0.05f; Canvas c = new Canvas(bm); Paint p = new Paint(); p.setColor(Color.WHITE); p.setStrokeWidth((int) (size / 10)); p.setTextSize((int) size); // Text Size p.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_OVER)); // Text Overlapping Pattern long second = (timeMs / 1000) % 60; long minute = (timeMs / (1000 * 60)) % 60; long hour = (timeMs / (1000 * 60 * 60)) % 24; String text = String.format("%s %02d:%02d:%02d", prefix, hour, minute, second); Rect r = new Rect(); p.getTextBounds(text, 0, text.length(), r); //c.drawBitmap(originalBitmap, 0, 0, paint); c.drawText(text, bm.getWidth() - r.width() - margin, bm.getHeight() - r.height() - margin, p); } /** * Take snapshots of a video file * * @param source path of the file * @param count of snapshots that are gonna be taken */ private void snapshot(final JSONObject options) { final CallbackContext context = this.callbackContext; this.cordova.getThreadPool().execute(new Runnable() { public void run() { MediaMetadataRetriever retriever = new MediaMetadataRetriever(); try { int count = options.optInt("count", 1); int countPerMinute = options.optInt("countPerMinute", 0); int quality = options.optInt("quality", 90); String source = options.optString("source", ""); Boolean timestamp = options.optBoolean("timeStamp", true); String prefix = options.optString("prefix", ""); int textSize = options.optInt("textSize", 48); if (source.isEmpty()) { throw new Exception("No source provided"); } JSONObject obj = new JSONObject(); obj.put("result", false); JSONArray results = new JSONArray(); Log.i("snapshot", "Got source: " + source); Uri p = Uri.parse(source); String filename = p.getLastPathSegment(); FileInputStream in = new FileInputStream(new File(p.getPath())); retriever.setDataSource(in.getFD()); String tmp = retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION); long duration = Long.parseLong(tmp); if (countPerMinute > 0) { count = (int) (countPerMinute * duration / (60 * 1000)); } if (count < 1) { count = 1; } long delta = duration / (count + 1); // Start at duration * 1 and ends at duration * count if (delta < 1000) { // min 1s delta = 1000; } Log.i("snapshot", "duration:" + duration + " delta:" + delta); File storage = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES); for (int i = 1; delta * i < duration && i <= count; i++) { String filename2 = filename.replace('.', '_') + "-snapshot" + i + ".jpg"; File dest = new File(storage, filename2); if (!storage.exists() && !storage.mkdirs()) { throw new Exception("Unable to access storage:" + storage.getPath()); } FileOutputStream out = new FileOutputStream(dest); Bitmap bm = retriever.getFrameAtTime(i * delta * 1000); if (timestamp) { drawTimestamp(bm, prefix, delta * i, textSize); } bm.compress(Bitmap.CompressFormat.JPEG, quality, out); out.flush(); out.close(); results.put(dest.getAbsolutePath()); } obj.put("result", true); obj.put("snapshots", results); context.success(obj); } catch (Exception ex) { ex.printStackTrace(); Log.e("snapshot", "Exception:", ex); fail("Exception: " + ex.toString()); } finally { try { retriever.release(); } catch (RuntimeException ex) { } } } }); } private void fail(String message) { this.callbackContext.error(message); PluginResult r = new PluginResult(PluginResult.Status.ERROR); callbackContext.sendPluginResult(r); } }