diff options
Diffstat (limited to 'tests_camera/src/com/android/camera/stress/ShotToShotLatency.java')
-rw-r--r-- | tests_camera/src/com/android/camera/stress/ShotToShotLatency.java | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/tests_camera/src/com/android/camera/stress/ShotToShotLatency.java b/tests_camera/src/com/android/camera/stress/ShotToShotLatency.java new file mode 100644 index 000000000..0c1ef45b9 --- /dev/null +++ b/tests_camera/src/com/android/camera/stress/ShotToShotLatency.java @@ -0,0 +1,143 @@ +/* + * 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.camera.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()); + } + } + } +} |