Merge ID3 parsing improvements from GitHub.

- Parse APIC and TextInformation frames.
- In MPEG-TS, don't mind if packets contain end padding.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=122743786

library/src/main/java/com/google/android/exoplayer/metadata/id3/Id3Parser.java

@@ -22,6 +22,7 @@ import com.google.android.exoplayer.util.ParsableByteArray;
 
 import java.io.UnsupportedEncodingException;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 import java.util.Locale;
@@ -60,52 +61,53 @@ public final class Id3Parser implements MetadataParser<List<Id3Frame>> {
 
       // Skip frame flags.
       id3Data.skipBytes(2);
-      // Check Frame ID == TXXX.
+
       if (frameId0 == 'T' && frameId1 == 'X' && frameId2 == 'X' && frameId3 == 'X') {
         int encoding = id3Data.readUnsignedByte();
         String charset = getCharsetName(encoding);
         byte[] frame = new byte[frameSize - 1];
         id3Data.readBytes(frame, 0, frameSize - 1);
 
-        int firstZeroIndex = indexOfEOS(frame, 0, encoding);
-        String description = new String(frame, 0, firstZeroIndex, charset);
-        int valueStartIndex = firstZeroIndex + delimiterLength(encoding);
+        int descriptionEndIndex = indexOfEOS(frame, 0, encoding);
+        String description = new String(frame, 0, descriptionEndIndex, charset);
+
+        int valueStartIndex = descriptionEndIndex + delimiterLength(encoding);
         int valueEndIndex = indexOfEOS(frame, valueStartIndex, encoding);
         String value = new String(frame, valueStartIndex, valueEndIndex - valueStartIndex, charset);
+
         id3Frames.add(new TxxxFrame(description, value));
       } else if (frameId0 == 'P' && frameId1 == 'R' && frameId2 == 'I' && frameId3 == 'V') {
-        // Check frame ID == PRIV
         byte[] frame = new byte[frameSize];
         id3Data.readBytes(frame, 0, frameSize);
 
-        int firstZeroIndex = indexOf(frame, 0, (byte) 0);
-        String owner = new String(frame, 0, firstZeroIndex, "ISO-8859-1");
-        byte[] privateData = new byte[frameSize - firstZeroIndex - 1];
-        System.arraycopy(frame, firstZeroIndex + 1, privateData, 0, frameSize - firstZeroIndex - 1);
+        int ownerEndIndex = indexOf(frame, 0, (byte) 0);
+        String owner = new String(frame, 0, ownerEndIndex, "ISO-8859-1");
+
+        byte[] privateData = Arrays.copyOfRange(frame, ownerEndIndex + 1, frame.length);
+
         id3Frames.add(new PrivFrame(owner, privateData));
       } else if (frameId0 == 'G' && frameId1 == 'E' && frameId2 == 'O' && frameId3 == 'B') {
-        // Check frame ID == GEOB
         int encoding = id3Data.readUnsignedByte();
         String charset = getCharsetName(encoding);
         byte[] frame = new byte[frameSize - 1];
         id3Data.readBytes(frame, 0, frameSize - 1);
 
-        int firstZeroIndex = indexOf(frame, 0, (byte) 0);
-        String mimeType = new String(frame, 0, firstZeroIndex, "ISO-8859-1");
-        int filenameStartIndex = firstZeroIndex + 1;
+        int mimeTypeEndIndex = indexOf(frame, 0, (byte) 0);
+        String mimeType = new String(frame, 0, mimeTypeEndIndex, "ISO-8859-1");
+
+        int filenameStartIndex = mimeTypeEndIndex + 1;
         int filenameEndIndex = indexOfEOS(frame, filenameStartIndex, encoding);
         String filename = new String(frame, filenameStartIndex,
             filenameEndIndex - filenameStartIndex, charset);
+
         int descriptionStartIndex = filenameEndIndex + delimiterLength(encoding);
         int descriptionEndIndex = indexOfEOS(frame, descriptionStartIndex, encoding);
         String description = new String(frame, descriptionStartIndex,
             descriptionEndIndex - descriptionStartIndex, charset);
 
-        int objectDataSize = frameSize - 1 /* encoding byte */ - descriptionEndIndex
-            - delimiterLength(encoding);
-        byte[] objectData = new byte[objectDataSize];
-        System.arraycopy(frame, descriptionEndIndex + delimiterLength(encoding), objectData, 0,
-            objectDataSize);
+        int objectDataStartIndex = descriptionEndIndex + delimiterLength(encoding);
+        byte[] objectData = Arrays.copyOfRange(frame, objectDataStartIndex, frame.length);
+
         id3Frames.add(new GeobFrame(mimeType, filename, description, objectData));
       } else {
         String type = String.format(Locale.US, "%c%c%c%c", frameId0, frameId1, frameId2, frameId3);