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core/java/android/speech/IRecognitionListener.aidl

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+/*
+ * Copyright (C) 2009 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 android.speech;
+
+import android.os.Bundle;
+
+/**
+ * Listener for speech recognition events, used with RecognitionService.
+ *  This gives you both the final recognition results, as well as various
+ *  intermediate events that can be used to show visual feedback to the user.
+ *  {@hide}
+ */
+interface IRecognitionListener {
+    /** Called when the endpointer is ready for the user to start speaking. */
+    void onReadyForSpeech(in Bundle noiseParams);
+
+    /** The user has started to speak. */
+    void onBeginningOfSpeech();
+
+    /** The sound level in the audio stream has changed. */
+    void onRmsChanged(in float rmsdB);
+
+    /**
+     * More sound has been received. Buffer is a byte buffer containing
+     * a sequence of 16-bit shorts. 
+     */
+    void onBufferReceived(in byte[] buffer);
+
+    /** Called after the user stops speaking. */
+    void onEndOfSpeech();
+
+    /** A network or recognition error occurred. */
+    void onError(in String error);
+
+    /** 
+     * Called when recognition transcripts are ready.
+     * results: an ordered list of the most likely transcripts (N-best list).
+     * @hide
+     */
+    void onResults(in List<String> results);
+}

core/java/android/speech/IRecognitionService.aidl

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+/*
+ * Copyright (C) 2009 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 android.speech;
+
+import android.content.Intent;
+import android.speech.IRecognitionListener;
+
+// A Service interface to speech recognition. Call startListening when
+// you want to begin capturing audio; RecognitionService will automatically
+// determine when the user has finished speaking, stream the audio to the
+// recognition servers, and notify you when results are ready.
+/** {@hide} */
+interface IRecognitionService {
+    // Start listening for speech. Can only call this from one thread at once.
+    // see RecognizerIntent.java for constants used to specify the intent.
+    void startListening(in Intent recognizerIntent,
+        in IRecognitionListener listener);
+
+    void cancel();
+}

core/java/android/speech/RecognitionServiceUtil.java

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+/*
+ * Copyright (C) 2009 Google Inc.
+ * 
+ * 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 android.speech;
+
+import android.content.ComponentName;
+import android.content.Intent;
+import android.content.ServiceConnection;
+import android.os.Bundle;
+import android.os.IBinder;
+
+import java.util.List;
+
+/**
+ * Utils for Google's network-based speech recognizer, which lets you perform
+ * speech-to-text translation through RecognitionService. IRecognitionService
+ * and IRecognitionListener are the core interfaces; you begin recognition
+ * through IRecognitionService and subscribe to callbacks about when the user
+ * stopped speaking, results come in, errors, etc. through IRecognitionListener.
+ * RecognitionServiceUtil includes default IRecognitionListener and
+ * ServiceConnection implementations to reduce the amount of boilerplate.
+ *
+ * The Service provides no user interface. See RecognitionActivity if you
+ * want the standard voice search UI.
+ *
+ * Below is a small skeleton of how to use the recognizer:
+ *
+ * ServiceConnection conn = new RecognitionServiceUtil.Connection();
+ * mContext.bindService(RecognitionServiceUtil.sDefaultIntent,
+ *     conn, Context.BIND_AUTO_CREATE);
+ * IRecognitionListener listener = new RecognitionServiceWrapper.NullListener() {
+ *         public void onResults(List<String> results) {
+ *             // Do something with recognition transcripts
+ *         }
+ *     }
+ *
+ * // Must wait for conn.mService to be populated, then call below
+ * conn.mService.startListening(null, listener);
+ *
+ * {@hide}
+ */
+public class RecognitionServiceUtil {
+    public static final Intent sDefaultIntent = new Intent(
+            RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
+
+    public static final String NOISE_LEVEL = "NoiseLevel";
+    public static final String SIGNAL_NOISE_RATIO = "SignalNoiseRatio";
+
+    private RecognitionServiceUtil() {}
+
+    /**
+     * IRecognitionListener which does nothing in response to recognition
+     * callbacks. You can subclass from this and override only the methods
+     * whose events you want to respond to.
+     */
+    public static class NullListener extends IRecognitionListener.Stub {
+        public void onReadyForSpeech(Bundle bundle) {}
+        public void onBeginningOfSpeech() {}
+        public void onRmsChanged(float rmsdB) {}
+        public void onBufferReceived(byte[] buf) {}
+        public void onEndOfSpeech() {}
+        public void onError(String error) {}
+        public void onResults(List<String> results) {}
+    }
+
+    /**
+     * Basic ServiceConnection which just records mService variable.
+     */
+    public static class Connection implements ServiceConnection {
+        public IRecognitionService mService;
+
+        public synchronized void onServiceConnected(ComponentName name, IBinder service) {
+            mService = IRecognitionService.Stub.asInterface(service);
+        }
+
+        public void onServiceDisconnected(ComponentName name) {
+            mService = null;
+        }
+    }
+}