| /* |
| * Copyright (C) 2012 The Android Open Source Project |
| * |
| * 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.android.gallery3d.stress; |
| |
| import android.app.Instrumentation; |
| import android.os.Environment; |
| import android.test.ActivityInstrumentationTestCase2; |
| import android.test.suitebuilder.annotation.LargeTest; |
| import android.util.Log; |
| import android.view.KeyEvent; |
| import com.android.camera.CameraActivity; |
| import java.io.BufferedWriter; |
| import java.io.File; |
| import java.io.FilenameFilter; |
| import java.io.FileWriter; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| |
| /** |
| * Junit / Instrumentation test case for measuring camera shot to shot latency |
| */ |
| public class ShotToShotLatency extends ActivityInstrumentationTestCase2<CameraActivity> { |
| private String TAG = "ShotToShotLatency"; |
| private static final int TOTAL_NUMBER_OF_SNAPSHOTS = 250; |
| private static final long SNAPSHOT_WAIT = 1000; |
| private static final String CAMERA_TEST_OUTPUT_FILE = |
| Environment.getExternalStorageDirectory().toString() + "/mediaStressOut.txt"; |
| private static final String CAMERA_IMAGE_DIRECTORY = |
| Environment.getExternalStorageDirectory().toString() + "/DCIM/Camera/"; |
| |
| public ShotToShotLatency() { |
| super(CameraActivity.class); |
| } |
| |
| @Override |
| protected void setUp() throws Exception { |
| getActivity(); |
| super.setUp(); |
| } |
| |
| @Override |
| protected void tearDown() throws Exception { |
| super.tearDown(); |
| } |
| |
| private void cleanupLatencyImages() { |
| try { |
| File sdcard = new File(CAMERA_IMAGE_DIRECTORY); |
| File[] pics = null; |
| FilenameFilter filter = new FilenameFilter() { |
| public boolean accept(File dir, String name) { |
| return name.endsWith(".jpg"); |
| } |
| }; |
| pics = sdcard.listFiles(filter); |
| for (File f : pics) { |
| f.delete(); |
| } |
| } catch (SecurityException e) { |
| Log.e(TAG, "Security manager access violation: " + e.toString()); |
| } |
| } |
| |
| private void sleep(long time) { |
| try { |
| Thread.sleep(time); |
| } catch (InterruptedException e) { |
| Log.e(TAG, "Sleep InterruptedException " + e.toString()); |
| } |
| } |
| |
| @LargeTest |
| public void testShotToShotLatency() { |
| long sigmaOfDiffFromMeanSquared = 0; |
| double mean = 0; |
| double standardDeviation = 0; |
| ArrayList<Long> captureTimes = new ArrayList<Long>(); |
| ArrayList<Long> latencyTimes = new ArrayList<Long>(); |
| |
| Log.v(TAG, "start testShotToShotLatency test"); |
| Instrumentation inst = getInstrumentation(); |
| |
| // Generate data points |
| for (int i = 0; i < TOTAL_NUMBER_OF_SNAPSHOTS; i++) { |
| inst.sendKeyDownUpSync(KeyEvent.KEYCODE_DPAD_CENTER); |
| sleep(SNAPSHOT_WAIT); |
| CameraActivity c = getActivity(); |
| if (c.getCaptureStartTime() > 0) { |
| captureTimes.add(c.getCaptureStartTime()); |
| } |
| } |
| |
| // Calculate latencies |
| for (int j = 1; j < captureTimes.size(); j++) { |
| latencyTimes.add(captureTimes.get(j) - captureTimes.get(j - 1)); |
| } |
| |
| // Crunch numbers |
| for (long dataPoint : latencyTimes) { |
| mean += (double) dataPoint; |
| } |
| mean /= latencyTimes.size(); |
| |
| for (long dataPoint : latencyTimes) { |
| sigmaOfDiffFromMeanSquared += (dataPoint - mean) * (dataPoint - mean); |
| } |
| standardDeviation = Math.sqrt(sigmaOfDiffFromMeanSquared / latencyTimes.size()); |
| |
| // Report statistics |
| File outFile = new File(CAMERA_TEST_OUTPUT_FILE); |
| BufferedWriter output = null; |
| try { |
| output = new BufferedWriter(new FileWriter(outFile, true)); |
| output.write("Shot to shot latency - mean: " + mean + "\n"); |
| output.write("Shot to shot latency - standard deviation: " + standardDeviation + "\n"); |
| cleanupLatencyImages(); |
| } catch (IOException e) { |
| Log.e(TAG, "testShotToShotLatency IOException writing to log " + e.toString()); |
| } finally { |
| try { |
| if (output != null) { |
| output.close(); |
| } |
| } catch (IOException e) { |
| Log.e(TAG, "Error closing file: " + e.toString()); |
| } |
| } |
| } |
| } |