Partial code for collecting latency data

6 files changed, 141 insertions, 0 deletions

diff --git a/LoopbackApp/app/src/main/java/org/drrickorang/loopback/LatencyActivity.java b/LoopbackApp/app/src/main/java/org/drrickorang/loopback/LatencyActivity.java
new file mode 100644
index 0000000..81eb122
--- /dev/null
+++ b/LoopbackApp/app/src/main/java/org/drrickorang/loopback/LatencyActivity.java
@@ -0,0 +1,34 @@
+package org.drrickorang.loopback;
+
+import android.app.Activity;
+import android.app.Notification;
+import android.content.Intent;
+import android.os.Bundle;
+import android.widget.TextView;
+
+import java.lang.reflect.AccessibleObject;
+
+/**
+ * Created by ninatai on 5/13/15.
+ */
+public class LatencyActivity extends Activity {
+    public void onCreate(Bundle savedInstanceState) {
+
+        super.onCreate(savedInstanceState);
+
+        Intent intent = getIntent();
+        String message = "Audio latency testing app using the Dr. Rick O'Rang audio loopback dongle.\n\n" +
+                "Author: Ricardo Garcia\n\n" +
+                "Open source project on: https://github.com/gkasten/drrickorang\n\n" +
+                "References: https://source.android.com/devices/audio/loopback.html\n" +
+                "https://source.android.com/devices/audio/latency_measure.html#loopback";
+
+        // Create the text view
+        TextView textView = new TextView(this);
+        textView.setTextSize(20);
+        textView.setText(message);
+
+        // Set the text view as the activity layout
+        setContentView(textView);
+    }
+}
diff --git a/LoopbackApp/app/src/main/java/org/drrickorang/loopback/LatencyRecord.java b/LoopbackApp/app/src/main/java/org/drrickorang/loopback/LatencyRecord.java
new file mode 100644
index 0000000..23a143c
--- /dev/null
+++ b/LoopbackApp/app/src/main/java/org/drrickorang/loopback/LatencyRecord.java
@@ -0,0 +1,67 @@
+package org.drrickorang.loopback;
+
+/**
+ * Created by ninatai on 5/12/15.
+ */
+
+import android.util.Log;
+
+import org.drrickorang.loopback.LoopbackAudioThread.RecorderRunnable;
+
+import java.util.HashMap;
+
+
+public class LatencyRecord {
+    private static long mPreviousTime = 0;
+    private static long mCurrentTime;
+    private static final int range = 1002;
+    private static int mMaxLatency = 0;
+
+    private static int[] mJavaLatency = new int[range];
+
+
+    public static void collectLatency()  {
+        mCurrentTime = System.nanoTime();
+        // if = 0 it's the first time the thread runs, so don't record the interval
+        if (mPreviousTime != 0 && mCurrentTime != 0) {
+            long diffInNano = mCurrentTime - mPreviousTime;
+            int diffInMilli = (int) Math.ceil(((double) (diffInNano / 1000))); // round up
+
+            if (diffInMilli > mMaxLatency) {
+                mMaxLatency = diffInMilli;
+            }
+
+            // from 0 ms to 1000 ms, plus a sum of all instances > 1000ms
+            if (diffInMilli >= 0 && diffInMilli < (range - 1)) {
+                mJavaLatency[diffInMilli] += 1;
+            } else if (diffInMilli >= (range - 1)) {
+                mJavaLatency[range-1] += 1;
+            } else if (diffInMilli < 0) {
+                // throw new IllegalLatencyException("Latency must be >= 0");
+                errorLog("Having negative Latency.");
+            }
+
+        }
+
+        mPreviousTime = mCurrentTime;
+    }
+
+    private static void errorLog(String msg) {
+        Log.e("LatencyTracker", msg);
+    }
+
+    private static void log(String msg) {
+        Log.v("LatencyTracker", msg);
+    }
+
+    public static class IllegalLatencyException extends Exception {
+
+        public IllegalLatencyException(String message)
+        {
+            super(message);
+        }
+    }
+
+
+
+}
diff --git a/LoopbackApp/app/src/main/java/org/drrickorang/loopback/LoopbackActivity.java b/LoopbackApp/app/src/main/java/org/drrickorang/loopback/LoopbackActivity.java
index 3a5acb0..02205ec 100644
--- a/LoopbackApp/app/src/main/java/org/drrickorang/loopback/LoopbackActivity.java
+++ b/LoopbackApp/app/src/main/java/org/drrickorang/loopback/LoopbackActivity.java
@@ -476,6 +476,15 @@ public class LoopbackActivity extends Activity {
             showToast("Test in progress... please wait");
     }
 
+
+    public void onButtonLatency(View view) {
+        if(!isBusy()) {
+            Intent aboutIntent = new Intent(this, LatencyActivity.class);
+            startActivity(aboutIntent);
+        } else
+            showToast("Test in progress... please wait");
+    }
+
     /** Called when the user clicks the button */
     public void onButtonSettings(View view) {
 
diff --git a/LoopbackApp/app/src/main/java/org/drrickorang/loopback/LoopbackAudioThread.java b/LoopbackApp/app/src/main/java/org/drrickorang/loopback/LoopbackAudioThread.java
index e7ed9c2..b17e483 100644
--- a/LoopbackApp/app/src/main/java/org/drrickorang/loopback/LoopbackAudioThread.java
+++ b/LoopbackApp/app/src/main/java/org/drrickorang/loopback/LoopbackAudioThread.java
@@ -28,6 +28,7 @@ import android.util.Log;
 
 import android.os.Handler;
 import  android.os.Message;
+import org.drrickorang.loopback.LatencyRecord;
 
 /**
  * A thread/audio track based audio synth.
@@ -65,6 +66,8 @@ public class LoopbackAudioThread extends Thread {
     boolean isPlaying = false;
     private Handler mMessageHandler;
 
+    // private static long mStartTime = 0; // the start time of the current loop in "run()"
+
     static final int FUN_PLUG_AUDIO_THREAD_MESSAGE_REC_STARTED = 992;
     static final int FUN_PLUG_AUDIO_THREAD_MESSAGE_REC_ERROR = 993;
     static final int FUN_PLUG_AUDIO_THREAD_MESSAGE_REC_COMPLETE = 994;
@@ -304,6 +307,8 @@ public class LoopbackAudioThread extends Thread {
         private short[] mAudioTone;
         private int mAudioToneIndex;
 
+        // private static long mStartTime = 0;
+
         double twoPi = 6.28318530718;
 
         public double[] mvSamples; //captured samples
@@ -424,7 +429,12 @@ public class LoopbackAudioThread extends Thread {
                     isRecording = mIsRecording;
                 }
 
+                //long mStartTime = System.nanoTime();
+                //WaitTimeRecord.collectLatency();
+
                 if (isRecording && mRecorder != null) {
+                    LatencyRecord.collectLatency();
+
                     int nSamplesRead = mRecorder.read(mAudioShortArray, 0, mMinRecordBuffSizeInSamples);
 //                        int nbBytesRead = mRecorder.read(mAudioByteArray, 0,
 //                                mMinRecordBuffSizeInBytes / 2);
@@ -472,6 +482,7 @@ public class LoopbackAudioThread extends Thread {
             stopRecording();//close this
         }
 
+
        public boolean isStillRoomToRecord() {
            boolean result = false;
            if (mvSamples != null) {
@@ -511,5 +522,8 @@ public class LoopbackAudioThread extends Thread {
             Log.v("Recorder", msg);
         }
 
+        //public static long getStartTime()
+        //    return mStartTime;
+
     } //RecorderRunnable
 };  //end thread.
diff --git a/LoopbackApp/app/src/main/res/layout/main_activity.xml b/LoopbackApp/app/src/main/res/layout/main_activity.xml
index 00ee4d0..ec71434 100644
--- a/LoopbackApp/app/src/main/res/layout/main_activity.xml
+++ b/LoopbackApp/app/src/main/res/layout/main_activity.xml
@@ -103,6 +103,22 @@
     </LinearLayout>
 
     <LinearLayout
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:tools="http://schemas.android.com/tools"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal">
+
+        <Button
+            xmlns:android="http://schemas.android.com/apk/res/android"
+            android:id="@+id/buttonLatency"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/buttonLatency"
+            android:onClick="onButtonLatency"/>
+    </LinearLayout>
+
+    <LinearLayout
         android:orientation="horizontal"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content">
diff --git a/LoopbackApp/app/src/main/res/values/strings.xml b/LoopbackApp/app/src/main/res/values/strings.xml
index a3a5173..652ff0b 100644
--- a/LoopbackApp/app/src/main/res/values/strings.xml
+++ b/LoopbackApp/app/src/main/res/values/strings.xml
@@ -27,6 +27,7 @@
     <string name="buttonZoomOut">Zoom Out</string>
     <string name="buttonZoomIn"> Zoom In</string>
     <string name="buttonAbout">About</string>
+    <string name="buttonLatency">Latency Plot</string>
 
     <!-- disabled -->
     <string name="buttonZoomInFull">In Full</string>