Gather more stats

Add a button to capture raw start and end callback time (just putting it
in a text buffer so it can be copied), which is useful for making plots.

Also a bunch of commented out code to provoke priority inversion or
sudden increases in load (which exercises the governor), again for the
purpose of probing performance and making plots.

android/res/layout/piano2.xml

@@ -18,19 +18,15 @@
         android:gravity="center_horizontal" />
     <TextView
         android:text=""
-        android:id="@+id/emptyLabel"
         android:gravity="center_horizontal" />
     <TextView
         android:text=""
-        android:id="@+id/emptyLabel"
         android:gravity="center_horizontal" />
     <TextView
         android:text=""
-        android:id="@+id/emptyLabel"
         android:gravity="center_horizontal" />
     <TextView
         android:text=""
-        android:id="@+id/emptyLabel"
         android:gravity="center_horizontal" />
   </TableRow>
   <TableRow>
@@ -39,13 +35,13 @@
         app:value="1.0"
         app:min="0"
         app:max="1"
-        android:layout_margin="2px" />
+        android:layout_margin="2dp" />
     <com.google.synthesizer.android.widgets.knob.KnobView
         android:id="@+id/resonanceKnob"
         app:value="0.0"
         app:min="0"
         app:max="1"
-        android:layout_margin="2px" />
+        android:layout_margin="2dp" />
     <LinearLayout
         android:orientation="vertical"
         android:layout_span="4" >
@@ -58,7 +54,18 @@
           android:id="@+id/status"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
-          android:layout_span="6"
+      />
+      <Button
+          android:layout_width="wrap_content"
+          android:layout_height="wrap_content"
+          android:id="@+id/capture"
+          android:text="@string/capture"
+          />
+      <TextView
+          android:id="@+id/stats"
+          android:layout_width="fill_parent"
+          android:layout_height="40dp"
+          android:textIsSelectable="true"
           />
     </LinearLayout>
   </TableRow>

android/res/values/strings.xml

@@ -77,4 +77,6 @@
     <item>Amplification</item>
     <item>Effects</item>
   </string-array>
+
+  <string name="capture">Capture</string>
 </resources>

android/src/com/google/synthesizer/android/service/SynthesizerService.java

@@ -69,13 +69,13 @@ public class SynthesizerService extends Service {
     // For now, cap the sample rate to reduce cpu requirements.
     sampleRateInHz = Math.min(sampleRateInHz, 11025);
     SoundFontReader sampleLibrary = null;
-    InputStream sampleLibraryFile = getResources().openRawResource(R.raw.drums);
-    try {
-      sampleLibrary = new SoundFontReader(sampleLibraryFile);
-    } catch (IOException e) {
-      logger_.log(Level.SEVERE, "Unable to load sample library.", e);
-      sampleLibrary = null;
-    }
+    //InputStream sampleLibraryFile = getResources().openRawResource(R.raw.drums);
+    //try {
+    //  sampleLibrary = new SoundFontReader(sampleLibraryFile);
+    //} catch (IOException e) {
+    //  logger_.log(Level.SEVERE, "Unable to load sample library.", e);
+    //  sampleLibrary = null;
+    //}
     synthesizer_ = new MultiChannelSynthesizer(CHANNELS, FINGERS, sampleRateInHz, sampleLibrary);
 
     // Load the presets from a file.

android/src/com/google/synthesizer/android/stats/JitterStats.java

@@ -35,10 +35,27 @@ public class JitterStats {
     return "max cb = " + Double.toString(maxCbTime * 1000) + "ms";
   }
 
+  public void setNominalCb(double nominalCb) {
+    nominalCbPeriod_ = nominalCb;
+  }
+
+  public String reportLong() {
+    StringBuilder sb = new StringBuilder();
+    double startTime = startTime_[bufIx_];
+    for (int i = 0; i < N_STATS; i++) {
+      double nominalStart = startTime + nominalCbPeriod_ * i;
+      double thisStart = startTime_[(bufIx_ + i) % N_STATS] - nominalStart;
+      double thisEnd = endTime_[(bufIx_ + i) % N_STATS] - nominalStart;
+      sb.append(thisStart + " " + thisEnd + "\n");
+    }
+    return sb.toString();
+  }
+
   static final int N_STATS = 2000;
   double meanCbTime_;
   double startTime_[];
   double endTime_[];
+  double nominalCbPeriod_;
   int bufIx_ = 0;
 
 }

android/src/com/google/synthesizer/android/ui/PianoActivity2.java

@@ -37,9 +37,11 @@ import android.os.Handler;
 import android.util.Log;
 import android.view.View;
 import android.view.WindowManager;
+import android.view.View.OnClickListener;
 import android.widget.AdapterView;
 import android.widget.AdapterView.OnItemSelectedListener;
 import android.widget.ArrayAdapter;
+import android.widget.Button;
 import android.widget.Spinner;
 import android.widget.TextView;
 
@@ -74,6 +76,8 @@ public class PianoActivity2 extends Activity {
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
       getJbMr1Params(params);
     }
+    //params.sampleRate = 44100;
+    //params.bufferSize = 976;
 
     androidGlue_ = new AndroidGlue();
     androidGlue_.start(params.sampleRate, params.bufferSize);
@@ -121,6 +125,7 @@ public class PianoActivity2 extends Activity {
     }
 
     jitterStats_ = new JitterStats();
+    jitterStats_.setNominalCb(params.bufferSize / (double)params.sampleRate);
     statusHandler_ = new Handler();
     statusRunnable_ = new Runnable() {
       public void run() {
@@ -136,6 +141,30 @@ public class PianoActivity2 extends Activity {
       }
     };
     statusRunnable_.run();
+
+    // Create burst of load -- test code to be removed. Ultimately we'll
+    // be able to get this kind of functionality by hooking up the sequencer
+    if (false) {
+      new Handler().postDelayed(new Runnable() {
+        public void run() {
+          int n = 110;
+          byte[] midi = new byte[n * 3];
+          for (int i = 0; i < n; i++) {
+            midi[i * 3] = (byte)0x90;
+            midi[i * 3 + 1] = (byte)(1 + i);
+            midi[i * 3 + 2] = 64;
+          }
+          androidGlue_.sendMidi(midi);
+        }
+      }, 10000);
+    }
+    Button captureButton = (Button) findViewById(R.id.capture);
+    captureButton.setOnClickListener(new OnClickListener() {
+      public void onClick(View v) {
+        TextView stats = (TextView) findViewById(R.id.stats);
+        stats.setText(jitterStats_.reportLong());
+      }
+    });
   }
 
   @Override

cpp/src/android_glue.cc

@@ -89,13 +89,16 @@ extern "C" void BqPlayerCallback(SLAndroidSimpleBufferQueueItf queueItf,
   double start_time = ts_to_double(&tp);
   int16_t *buf_ptr = buffer + buffer_size * cur_buffer;
   synth_unit->GetSamples(buffer_size, buf_ptr);
+  char buf[64];
+  //uint8_t *mem = new uint8_t[1024];
+  //delete[] mem;
+  //sprintf(buf, "%.6f", start_time);
   clock_gettime(CLOCK_MONOTONIC, &tp);
   double end_time = ts_to_double(&tp);
   SLresult result = (*queueItf)->Enqueue(bq_player_buffer_queue,
     buf_ptr, buffer_size * 2);
   assert(SL_RESULT_SUCCESS == result);
   cur_buffer = (cur_buffer + 1) % N_BUFFERS;
-  char buf[64];
   size_t i = 0;
   buf[i++] = 't';
   buf[i++] = 's';

cpp/src/fm_core.cc

@@ -18,10 +18,6 @@
 #include <iostream>
 #endif
 
-#ifdef __ANDROID_API__
-#include <cpu-features.h>
-#endif
-
 #include "synth.h"
 #include "fm_op_kernel.h"
 #include "fm_core.h"