samples: Add Speech API quickstart sample. (#497)

Author: jmdobry

speech/snippets/resources/audio.raw

@@ -0,0 +1,69 @@
+/*
+  Copyright 2017, 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 com.example.speech;
+
+// [START speech_quickstart]
+// Imports the Google Cloud client library
+import com.google.cloud.speech.spi.v1beta1.SpeechClient;
+import com.google.cloud.speech.v1beta1.RecognitionAudio;
+import com.google.cloud.speech.v1beta1.RecognitionConfig;
+import com.google.cloud.speech.v1beta1.RecognitionConfig.AudioEncoding;
+import com.google.cloud.speech.v1beta1.SpeechRecognitionAlternative;
+import com.google.cloud.speech.v1beta1.SpeechRecognitionResult;
+import com.google.cloud.speech.v1beta1.SyncRecognizeResponse;
+import com.google.protobuf.ByteString;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.List;
+
+public class QuickstartSample {
+  public static void main(String... args) throws Exception {
+    // Instantiates a client
+    SpeechClient speech = SpeechClient.create();
+
+    // The path to the audio file to transcribe
+    String fileName = "./resources/audio.raw";
+
+    // Reads the audio file into memory
+    Path path = Paths.get(fileName);
+    byte[] data = Files.readAllBytes(path);
+    ByteString audioBytes = ByteString.copyFrom(data);
+
+    // Builds the sync recognize request
+    RecognitionConfig config = RecognitionConfig.newBuilder()
+        .setEncoding(AudioEncoding.LINEAR16)
+        .setSampleRate(16000)
+        .build();
+    RecognitionAudio audio = RecognitionAudio.newBuilder()
+        .setContent(audioBytes)
+        .build();
+
+    // Performs speech recognition on the audio file
+    SyncRecognizeResponse response = speech.syncRecognize(config, audio);
+    List<SpeechRecognitionResult> results = response.getResultsList();
+
+    for (SpeechRecognitionResult result: results) {
+      List<SpeechRecognitionAlternative> alternatives = result.getAlternativesList();
+      for (SpeechRecognitionAlternative alternative: alternatives) {
+        System.out.printf("Transcription: %s%n", alternative.getTranscript());
+      }
+    }
+  }
+}
+// [END speech_quickstart]

speech/snippets/src/main/java/com/example/speech/QuickstartSample.java

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+/*
+  Copyright 2017, 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 com.example.speech;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+
+/**
+ * Tests for quickstart sample.
+ */
+@RunWith(JUnit4.class)
+@SuppressWarnings("checkstyle:abbreviationaswordinname")
+public class QuickstartSampleIT {
+  private ByteArrayOutputStream bout;
+  private PrintStream out;
+
+  @Before
+  public void setUp() {
+    bout = new ByteArrayOutputStream();
+    out = new PrintStream(bout);
+    System.setOut(out);
+  }
+
+  @After
+  public void tearDown() {
+    System.setOut(null);
+  }
+
+  @Test
+  public void testQuickstart() throws Exception {
+    // Act
+    QuickstartSample.main();
+
+    // Assert
+    String got = bout.toString();
+    assertThat(got).contains("how old is the Brooklyn Bridge");
+  }
+}