Changeset 0401409 in orbit for android/src

Timestamp:

11/29/12 14:26:23 (10 years ago)

Author:

Steve Castellotti <sc@…>

Branches:

master, RawEEG, Raw_EEG_Plot, Servo, Tab_Interface, pyramid

Children:

754dbda

Parents:

a0b523e

Message:

• plays 440 Hz carrier tone for 10 seconds after pressing "Demo" button

File:

• android/src/info/puzzlebox/orbit/MainActivity.java (modified) (4 diffs)

android/src/info/puzzlebox/orbit/MainActivity.java

@@ -10 +10 @@
 import com.neurosky.thinkgear.TGDevice;
 
+import android.media.AudioFormat;
+import android.media.AudioManager;
+import android.media.AudioTrack;
 import android.os.Bundle;
 import android.os.Handler;
@@ -91 +94 @@
         //private static final String MAC_ADDRESS = "00:16:53:09:0B:B9";
 
+        
+        
+        // Tone Generator
+        // http://stackoverflow.com/questions/2413426/playing-an-arbitrary-tone-with-android
+        private final int duration = 10; // seconds
+    private final int sampleRate = 8000;
+    private final int numSamples = duration * sampleRate;
+    private final double sample[] = new double[numSamples];
+    private final double freqOfTone = 440; // hz
+    
+    private final byte generatedSnd[] = new byte[2 * numSamples];
+        
+    
+    void genTone(){
+        // fill out the array
+        for (int i = 0; i < numSamples; ++i) {
+            sample[i] = Math.sin(2 * Math.PI * i / (sampleRate/freqOfTone));
+        }
+
+        // convert to 16 bit pcm sound array
+        // assumes the sample buffer is normalized.
+        int idx = 0;
+        for (final double dVal : sample) {
+            // scale to maximum amplitude
+            final short val = (short) ((dVal * 32767));
+            // in 16 bit wav PCM, first byte is the low order byte
+            generatedSnd[idx++] = (byte) (val & 0x00ff);
+            generatedSnd[idx++] = (byte) ((val & 0xff00) >>> 8);
+
+        }
+    }
+
+    void playSound(){
+        @SuppressWarnings("deprecation")
+                final AudioTrack audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC,
+//                sampleRate, AudioFormat.CHANNEL_CONFIGURATION_MONO,
+              sampleRate, AudioFormat.CHANNEL_OUT_MONO,
+//              sampleRate, AudioFormat.CHANNEL_OUT_STEREO,
+//                sampleRate, AudioFormat.CHANNEL_OUT_FRONT_RIGHT,
+//                sampleRate, AudioFormat.CHANNEL_CONFIGURATION_STEREO,
+                AudioFormat.ENCODING_PCM_16BIT, generatedSnd.length,
+                AudioTrack.MODE_STATIC);
+        audioTrack.write(generatedSnd, 0, generatedSnd.length);
+        audioTrack.play();
+    }
+        
+        
         /**
          * The device currently in use, or {@code null}.
@@ -207 +257 @@
                 serial = new SerialDevice();
                 serial.setSerialDevice(mSerialDevice);
+                
+                
+                genTone();
+                //playSound();
 
 
@@ -520 +574 @@
 
         public void demoMode(View view) {
-
-                String command = "neutral";
                 
-                appendTextAndScroll("Command for serial device: " + command + "\n");
-                serial.setCommand(command);
-
-                try {
-                        Thread.sleep(5000);
-                } catch (InterruptedException e) {
-                        // TODO Auto-generated catch block
-                        e.printStackTrace();
-                }
-
-//              command = "hover";
-                command = "idle";
-                appendTextAndScroll("Command for serial device: " + command + "\n");
-                serial.setCommand(command);
-
-                try {
-                        Thread.sleep(2500);
-                } catch (InterruptedException e) {
-                        // TODO Auto-generated catch block
-                        e.printStackTrace();
-                }               
-
-
-                command = "neutral";
-                appendTextAndScroll("Command for serial device: " + command + "\n");
-                serial.setCommand(command);
+                playSound();
+
+//              String command = "neutral";
+//              
+//              appendTextAndScroll("Command for serial device: " + command + "\n");
+//              serial.setCommand(command);
+//
+//              try {
+//                      Thread.sleep(5000);
+//              } catch (InterruptedException e) {
+//                      // TODO Auto-generated catch block
+//                      e.printStackTrace();
+//              }
+//
+////            command = "hover";
+//              command = "idle";
+//              appendTextAndScroll("Command for serial device: " + command + "\n");
+//              serial.setCommand(command);
+//
+//              try {
+//                      Thread.sleep(2500);
+//              } catch (InterruptedException e) {
+//                      // TODO Auto-generated catch block
+//                      e.printStackTrace();
+//              }               
+//
+//
+//              command = "neutral";
+//              appendTextAndScroll("Command for serial device: " + command + "\n");
+//              serial.setCommand(command);