1 files changed, 142 insertions, 0 deletions
diff --git a/tests/src/com/android/camera/stress/ShotToShotLatency.java b/tests/src/com/android/camera/stress/ShotToShotLatency.java
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+++ b/tests/src/com/android/camera/stress/ShotToShotLatency.java
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+/*
+ * 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());
+        }
+    }
+
+    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());
+            }
+        }
+    }
+}