Add AudioRecorder

src/main/java/envoy/client/data/AudioRecorder.java

@@ -0,0 +1,68 @@
+package envoy.client.data;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+import javax.sound.sampled.*;
+
+import envoy.exception.EnvoyException;
+
+/**
+ * Records audio and exports it as a byte array.
+ * <p>
+ * Project: <strong>envoy-client</strong><br>
+ * File: <strong>AudioRecorder.java</strong><br>
+ * Created: <strong>02.07.2020</strong><br>
+ *
+ * @author Kai S. K. Engelbart
+ * @since Envoy Client v0.1-beta
+ */
+public final class AudioRecorder {
+
+	private final AudioFormat format;
+
+	private DataLine.Info	info;
+	private TargetDataLine	line;
+	private Path			tempFile;
+
+	public AudioRecorder() { this(new AudioFormat(16000, 16, 1, true, false)); }
+
+	public AudioRecorder(AudioFormat format) {
+		this.format	= format;
+		info		= new DataLine.Info(TargetDataLine.class, format);
+	}
+
+	public boolean isSupported() { return AudioSystem.isLineSupported(info); }
+
+	public void start() throws EnvoyException {
+		try {
+
+			// Open the line
+			line = (TargetDataLine) AudioSystem.getLine(info);
+			line.open(format);
+			line.start();
+
+			// Prepare temp file
+			tempFile = Files.createTempFile("recording", "wav");
+
+			// Start the recording
+			var ais = new AudioInputStream(line);
+			AudioSystem.write(ais, AudioFileFormat.Type.WAVE, tempFile.toFile());
+		} catch (IOException | LineUnavailableException e) {
+			throw new EnvoyException("Cannot record voice", e);
+		}
+	}
+
+	public byte[] finish() throws EnvoyException {
+		try {
+			line.stop();
+			line.close();
+			byte[] data = Files.readAllBytes(tempFile);
+			Files.delete(tempFile);
+			return data;
+		} catch (IOException e) {
+			throw new EnvoyException("Cannot save voice recording", e);
+		}
+	}
+}