Java Sample: Fix logic for reading from a FileInputStream and other minor issues (#885)

* Fix issue #874. Properly handle shorter read buffers at the end of the WAV file.
* Suppress two warnings of unused variables (they are required for code readability)
* Resolve one warning of unused import

Author: dargilco

samples/java/jre/console/src/com/microsoft/cognitiveservices/speech/samples/console/SpeechRecognitionSamples.java

@@ -356,9 +356,18 @@ else if (e.getResult().getReason() == ResultReason.NoMatch) {
             // Push audio read from the file into the PushStream.
             // The audio can be pushed into the stream before, after, or during recognition
             // and recognition will continue as data becomes available.
-            while(  inputStream.read(readBuffer) != -1)
+            int bytesRead;
+            while ((bytesRead = inputStream.read(readBuffer)) != -1)
             {
-                pushStream.write(readBuffer);
+                if (bytesRead == readBuffer.length)
+                {
+                    pushStream.write(readBuffer);
+                }
+                else
+                {
+                    // Last buffer read from the WAV file is likely to have less bytes
+                    pushStream.write(Arrays.copyOfRange(readBuffer, 0, bytesRead));
+                }
             }
 
             pushStream.close();

samples/java/jre/console/src/com/microsoft/cognitiveservices/speech/samples/console/TranslationSamples.java

@@ -5,7 +5,6 @@
 //
 
 import java.io.IOException;
-import java.util.ArrayList;
 import java.util.Map;
 import java.util.Scanner;
 import java.util.concurrent.ExecutionException;

samples/java/jre/console/src/com/microsoft/cognitiveservices/speech/samples/console/WavStream.java

@@ -91,7 +91,9 @@ public InputStream parseWavHeader(InputStream reader) throws IOException {
         int formatTag = ReadUInt16(reader);
         int channels = ReadUInt16(reader);
         int samplesPerSec = (int) ReadUInt32(reader);
+        @SuppressWarnings("unused")
         int avgBytesPerSec = (int) ReadUInt32(reader);
+        @SuppressWarnings("unused")
         int blockAlign = ReadUInt16(reader);
         int bitsPerSample = ReadUInt16(reader);
         ThrowIfFalse(formatTag == 1, "PCM"); // PCM