Fixed an issue when looking for termination string in UTF-16 and UTF-16BE

Modified parse method to take into account different lengths for the
termination character (1 for UTF-8 and ISO-8859-1; 2 for UTF-16 and
UTF-16BE).

library/src/main/java/com/google/android/exoplayer/metadata/Id3Parser.java

@@ -67,7 +67,7 @@ public class Id3Parser implements MetadataParser<Map<String, Object>> {
 
         int firstZeroIndex = indexOfEOS(frame, 0, encoding);
         String description = new String(frame, 0, firstZeroIndex, charset);
-        int valueStartIndex = firstZeroIndex + 1;
+        int valueStartIndex = firstZeroIndex + delimiterLength(encoding);
         int valueEndIndex = indexOfEOS(frame, valueStartIndex, encoding);
         String value = new String(frame, valueStartIndex, valueEndIndex - valueStartIndex,
             charset);
@@ -91,17 +91,17 @@ public class Id3Parser implements MetadataParser<Map<String, Object>> {
 
         int firstZeroIndex = indexOf(frame, 0, (byte) 0);
         String mimeType = new String(frame, 0, firstZeroIndex, "ISO-8859-1");
-        int filenameStartIndex = firstZeroIndex + 1;
+        int filenameStartIndex = firstZeroIndex + delimiterLength(encoding);
         int filenameEndIndex = indexOfEOS(frame, filenameStartIndex, encoding);
         String filename = new String(frame, filenameStartIndex,
                                      filenameEndIndex - filenameStartIndex, charset);
-        int descriptionStartIndex = filenameEndIndex + 1;
+        int descriptionStartIndex = filenameEndIndex + delimiterLength(encoding);
         int descriptionEndIndex = indexOfEOS(frame, descriptionStartIndex, encoding);
         String description = new String(frame, descriptionStartIndex,
                 descriptionEndIndex - descriptionStartIndex, charset);
 
         byte[] objectData = new byte[frameSize - descriptionEndIndex - 2];
-        System.arraycopy(frame, descriptionEndIndex + 1, objectData, 0,
+        System.arraycopy(frame, descriptionEndIndex + delimiterLength(encoding), objectData, 0,
                          frameSize - descriptionEndIndex - 2);
         metadata.put(GeobMetadata.TYPE, new GeobMetadata(mimeType, filename,
                                                          description, objectData));
@@ -147,7 +147,7 @@ public class Id3Parser implements MetadataParser<Map<String, Object>> {
     // Otherwise, look for a two zero bytes
     while(terminationPos < data.length - 1) {
       if(data[terminationPos + 1] == (byte) 0) {
-        return terminationPos + 1;
+        return terminationPos;
       }
       terminationPos = indexOf(data, terminationPos + 1, (byte) 0);
     }
@@ -155,6 +155,11 @@ public class Id3Parser implements MetadataParser<Map<String, Object>> {
     return data.length;
   }
 
+  private static int delimiterLength(int encodingByte) {
+    return (encodingByte == ID3_TEXT_ENCODING_ISO_8859_1 ||
+            encodingByte == ID3_TEXT_ENCODING_UTF_8) ? 1 : 2;
+  }
+
   /**
    * Parses an ID3 header.
    *