WIP

Signed-off-by: Daniel W. S. Almeida <[email protected]>

Author: dwlsalmeida

app/src/main/java/io/pslab/activity/WaveGeneratorActivity.java

@@ -9,6 +9,7 @@
 import android.graphics.drawable.Drawable;
 import android.location.Location;
 import android.location.LocationManager;
+import android.media.AudioDeviceInfo;
 import android.media.AudioFormat;
 import android.media.AudioManager;
 import android.media.AudioTrack;
@@ -140,6 +141,8 @@ public class WaveGeneratorActivity extends AppCompatActivity {
     Button btnAnalogMode;
     @BindView(R.id.digital_mode_btn)
     Button btnDigitalMode;
+    @BindView(R.id.use_phone_btn)
+    Button btnUsePhone;
     @BindView(R.id.pwm_btn_freq)
     Button pwmBtnFreq;
     @BindView(R.id.pwm_btn_duty)
@@ -187,7 +190,9 @@ public class WaveGeneratorActivity extends AppCompatActivity {
     private RelativeLayout squareModeControls;
     private LineChart previewChart;
     private boolean isPlayingSound = false;
+    private boolean usePhone = false;
     private ProduceSoundTask produceSoundTask;
+    private GenerateWavesFromPhoneTask generateWavesFromPhoneTask;
 
     @SuppressLint("ClickableViewAccessibility")
     @Override
@@ -334,6 +339,21 @@ public void onClick(View v) {
             }
         });
 
+        btnUsePhone.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                usePhone = !usePhone;
+                if(usePhone) {
+                    btnUsePhone.setText(R.string.text_use_pslab);
+                    generateWavesFromPhoneTask = new GenerateWavesFromPhoneTask(WaveGeneratorActivity.this);
+                    generateWavesFromPhoneTask.execute();
+                } else {
+                    btnUsePhone.setText(R.string.text_use_phone);
+                    generateWavesFromPhoneTask.cancel(true);
+                }
+            }
+        });
+
         btnPwmSq1.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
@@ -1282,6 +1302,42 @@ public void recordSensorData(RealmObject sensorData) {
         realm.commitTransaction();
     }
 
+    /**
+     * Samples a wave into an AudioTrack instance. Useful for either playing sound or pushing the signal
+     * through the headphone jack.
+     *
+     */
+    public void sampleWaveIntoAudioTrack(AudioTrack track, int sampleRateInHz, int bufferLength) {
+        assert(track != null);
+
+        short[] buffer = new short[bufferLength];
+        float angle = 0;
+        float samples[] = new float[bufferLength];
+        double frequency;
+
+        while(true) {
+            if (WaveGeneratorCommon.mode_selected == WaveConst.SQUARE) {
+                frequency = WaveGeneratorCommon.wave.get(waveBtnActive).get(WaveConst.FREQUENCY);
+            } else {
+                frequency = WaveGeneratorCommon.wave.get(WaveConst.SQR1).get(WaveConst.FREQUENCY);
+            }
+            float increment = (float) ((2 * Math.PI) * frequency / sampleRateInHz);
+            for (int i = 0; i < samples.length; i++) {
+                samples[i] = (float) Math.sin(angle);
+                if (WaveGeneratorCommon.mode_selected == WaveConst.PWM) {
+                    samples[i] = (samples[i] >= 0.0) ? 1 : -1;
+                } else {
+                    if (WaveGeneratorCommon.wave.get(waveBtnActive).get(WaveConst.WAVETYPE) == 2) {
+                        samples[i] = (float) ((2 / Math.PI) * Math.asin(samples[i]));
+                    }
+                }
+                buffer[i] = (short) (samples[i] * Short.MAX_VALUE);
+                angle += increment;
+            }
+            track.write(buffer, 0, buffer.length);
+        }
+    }
+
     public enum WaveConst {WAVETYPE, WAVE1, WAVE2, SQR1, SQR2, SQR3, SQR4, FREQUENCY, PHASE, DUTY, SQUARE, PWM}
 
     public enum WaveData {
@@ -1300,47 +1356,94 @@ public final int getValue() {
 
     private class ProduceSoundTask extends AsyncTask<Void, Void, Void> {
 
-        private AudioTrack track;
+        final int sampleRateInHz = 44100;
+        final int bufferLength = 1024;
+        private AudioTrack track = new AudioTrack(AudioManager.STREAM_MUSIC, sampleRateInHz, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, bufferLength, AudioTrack.MODE_STREAM);
+        private Thread thread = new Thread(new Runnable() {
+            @Override
+            public void run() {
+                track.play();
+                sampleWaveIntoAudioTrack(track, sampleRateInHz, bufferLength);
+            }
+        });
 
         @Override
         protected Void doInBackground(Void... voids) {
-            short[] buffer = new short[1024];
-            track = new AudioTrack(AudioManager.STREAM_MUSIC, 44100, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, buffer.length, AudioTrack.MODE_STREAM);
-            float angle = 0;
-            float samples[] = new float[1024];
-
-            track.play();
-            double frequency;
-            while (isPlayingSound) {
-                if (WaveGeneratorCommon.mode_selected == WaveConst.SQUARE) {
-                    frequency = WaveGeneratorCommon.wave.get(waveBtnActive).get(WaveConst.FREQUENCY);
-                } else {
-                    frequency = WaveGeneratorCommon.wave.get(WaveConst.SQR1).get(WaveConst.FREQUENCY);
+            thread.start();
+            while(isPlayingSound) {}  /* loop until button is unselected */
+            thread.interrupt();
+            return null;
+        }
+
+        @Override
+        protected void onCancelled() {
+            super.onCancelled();
+            thread.interrupt();
+            track.flush();
+            track.stop();
+            track.release();
+        }
+    }
+
+    private class GenerateWavesFromPhoneTask extends AsyncTask<Void, Void, Void> {
+
+        WaveGeneratorActivity activity = null;
+        final int sampleRateInHz = 44100;
+        final int bufferLength = 1024;
+        private AudioTrack track = new AudioTrack(AudioManager.STREAM_MUSIC, sampleRateInHz, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, bufferLength, AudioTrack.MODE_STREAM);
+        private Thread thread = new Thread(new Runnable() {
+            @Override
+            public void run() {
+                track.play();
+                sampleWaveIntoAudioTrack(track, sampleRateInHz, bufferLength);
+            }
+        });
+
+        public GenerateWavesFromPhoneTask(WaveGeneratorActivity activity) {
+            this.activity = activity;
+        }
+
+        @Override
+        protected Void doInBackground(Void... voids) {
+            boolean wired = false;
+            AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
+            AudioDeviceInfo[] audioDevices = audioManager.getDevices(AudioManager.GET_DEVICES_ALL);
+            for(AudioDeviceInfo deviceInfo : audioDevices){
+                if(deviceInfo.getType()==AudioDeviceInfo.TYPE_WIRED_HEADPHONES
+                        || deviceInfo.getType()==AudioDeviceInfo.TYPE_WIRED_HEADSET){
+                    wired = true;
+                    break;
                 }
-                float increment = (float) ((2 * Math.PI) * frequency / 44100);
-                for (int i = 0; i < samples.length; i++) {
-                    samples[i] = (float) Math.sin(angle);
-                    if (WaveGeneratorCommon.mode_selected == WaveConst.PWM) {
-                        samples[i] = (samples[i] >= 0.0) ? 1 : -1;
-                    } else {
-                        if (WaveGeneratorCommon.wave.get(waveBtnActive).get(WaveConst.WAVETYPE) == 2) {
-                            samples[i] = (float) ((2 / Math.PI) * Math.asin(samples[i]));
-                        }
+            }
+            if(!wired) {
+                activity.runOnUiThread(new Runnable() {
+                    @Override
+                    public void run() {
+                        Toast.makeText(getApplicationContext(), R.string.text_not_wired,Toast.LENGTH_SHORT).show();
                     }
-                    buffer[i] = (short) (samples[i] * Short.MAX_VALUE);
-                    angle += increment;
-                }
-                track.write(buffer, 0, buffer.length);
+                });
+                return null;
             }
+            thread.start();
+            while(usePhone) {}  /* loop until button is unselected */
+            thread.interrupt();
             return null;
         }
 
         @Override
         protected void onCancelled() {
             super.onCancelled();
+            thread.interrupt();
             track.flush();
             track.stop();
             track.release();
         }
+
+        @Override
+        protected void onPostExecute(Void aVoid) {
+            super.onPostExecute(aVoid);
+            activity.usePhone = false;
+            activity.btnUsePhone.setText(R.string.text_use_phone);
+        }
     }
 }

app/src/main/res/layout/wave_generator_main_controls.xml

@@ -51,4 +51,21 @@
         android:textAllCaps="false"
         android:textColor="@color/white"
         android:textSize="@dimen/wave_gen_control_text_size" />
+
+    <Button
+        android:id="@+id/use_phone_btn"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_marginStart="@dimen/margin_btn"
+        android:layout_marginTop="@dimen/margin_btn"
+        android:layout_marginEnd="@dimen/margin_btn"
+        android:layout_marginBottom="@dimen/margin_btn"
+        android:layout_weight="1"
+        android:background="@drawable/btn_back_rounded"
+        android:minWidth="@dimen/btn_min_width"
+        android:stateListAnimator="@animator/selector_animator"
+        android:text="@string/text_use_phone"
+        android:textAllCaps="false"
+        android:textColor="@color/white"
+        android:textSize="@dimen/wave_gen_control_text_size" />
 </LinearLayout>

app/src/main/res/values/strings.xml

@@ -695,7 +695,9 @@
     <string name="duty_cycle">Duty Cycle:</string>
     <string name="mode">Mode</string>
     <string name="text_digital">Digital</string>
-
+    <string name="text_use_phone">Use Phone</string>
+    <string name="text_use_pslab">Use PSLab</string>
+    <string name="text_not_wired">Nothing plugged in the headphone jack</string>
     <string name="text_connected">Connected</string>
     <string name="text_disconnected">Disconnected</string>