Refactored the SubtitleParser's parse() signature

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=111326567

library/src/androidTest/java/com/google/android/exoplayer/testutil/TestUtil.java

@@ -21,13 +21,16 @@ import com.google.android.exoplayer.extractor.Extractor;
 import com.google.android.exoplayer.extractor.ExtractorInput;
 import com.google.android.exoplayer.extractor.PositionHolder;
 import com.google.android.exoplayer.upstream.DataSpec;
+import com.google.android.exoplayer.util.Util;
 
+import android.app.Instrumentation;
 import android.net.Uri;
 import android.test.InstrumentationTestCase;
 
 import org.mockito.MockitoAnnotations;
 
 import java.io.IOException;
+import java.io.InputStream;
 import java.util.Arrays;
 import java.util.Random;
 
@@ -115,4 +118,10 @@ public class TestUtil {
     MockitoAnnotations.initMocks(instrumentationTestCase);
   }
 
+  public static byte[] getByteArray(Instrumentation instrumentation, String fileName)
+      throws IOException {
+    InputStream is = instrumentation.getContext().getResources().getAssets().open(fileName);
+    return Util.toByteArray(is);
+  }
+
 }

library/src/androidTest/java/com/google/android/exoplayer/text/mp4webvtt/Mp4WebvttParserTest.java

@@ -24,7 +24,6 @@ import android.util.ArraySet;
 
 import junit.framework.TestCase;
 
-import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.util.Arrays;
 import java.util.List;
@@ -107,29 +106,29 @@ public final class Mp4WebvttParserTest extends TestCase {
 
   // Positive tests.
 
-  public void testSingleCueSample() throws IOException {
-    Subtitle result = parser.parse(new ByteArrayInputStream(SINGLE_CUE_SAMPLE));
+  public void testSingleCueSample() throws ParserException {
+    Subtitle result = parser.parse(SINGLE_CUE_SAMPLE, 0, SINGLE_CUE_SAMPLE.length);
     Cue expectedCue = new Cue("Hello World"); // Line feed must be trimmed by the parser
     assertMp4WebvttSubtitleEquals(result, expectedCue);
   }
 
-  public void testTwoCuesSample() throws IOException {
-    Subtitle result = parser.parse(new ByteArrayInputStream(DOUBLE_CUE_SAMPLE));
+  public void testTwoCuesSample() throws ParserException {
+    Subtitle result = parser.parse(DOUBLE_CUE_SAMPLE, 0, DOUBLE_CUE_SAMPLE.length);
     Cue firstExpectedCue = new Cue("Hello World");
     Cue secondExpectedCue = new Cue("Bye Bye");
     assertMp4WebvttSubtitleEquals(result, firstExpectedCue, secondExpectedCue);
   }
 
   public void testNoCueSample() throws IOException {
-    Subtitle result = parser.parse(new ByteArrayInputStream(NO_CUE_SAMPLE));
+    Subtitle result = parser.parse(NO_CUE_SAMPLE, 0, NO_CUE_SAMPLE.length);
     assertMp4WebvttSubtitleEquals(result, new Cue[] {});
   }
 
   // Negative tests.
 
-  public void testSampleWithVttCueWithNoPayload() throws IOException {
+  public void testSampleWithVttCueWithNoPayload() {
     try {
-      parser.parse(new ByteArrayInputStream(NO_PAYLOAD_CUE_SAMPLE));
+      parser.parse(NO_PAYLOAD_CUE_SAMPLE, 0, NO_PAYLOAD_CUE_SAMPLE.length);
     } catch (ParserException e) {
       // Expected.
       return;
@@ -137,9 +136,9 @@ public final class Mp4WebvttParserTest extends TestCase {
     fail("The parser should have failed, no payload was included in the VTTCue.");
   }
 
-  public void testSampleWithIncompleteHeader() throws IOException {
+  public void testSampleWithIncompleteHeader() {
     try {
-      parser.parse(new ByteArrayInputStream(INCOMPLETE_HEADER_SAMPLE));
+      parser.parse(INCOMPLETE_HEADER_SAMPLE, 0, INCOMPLETE_HEADER_SAMPLE.length);
     } catch (ParserException e) {
       return;
     }

library/src/androidTest/java/com/google/android/exoplayer/text/subrip/SubripParserTest.java

@@ -15,10 +15,11 @@
  */
 package com.google.android.exoplayer.text.subrip;
 
+import com.google.android.exoplayer.testutil.TestUtil;
+
 import android.test.InstrumentationTestCase;
 
 import java.io.IOException;
-import java.io.InputStream;
 
 /**
  * Unit test for {@link SubripParser}.
@@ -34,8 +35,8 @@ public final class SubripParserTest extends InstrumentationTestCase {
 
   public void testParseEmpty() throws IOException {
     SubripParser parser = new SubripParser();
-    InputStream inputStream = getInputStream(EMPTY_FILE);
-    SubripSubtitle subtitle = parser.parse(inputStream);
+    byte[] bytes = TestUtil.getByteArray(getInstrumentation(), EMPTY_FILE);
+    SubripSubtitle subtitle = parser.parse(bytes, 0, bytes.length);
     // Assert that the subtitle is empty.
     assertEquals(0, subtitle.getEventTimeCount());
     assertTrue(subtitle.getCues(0).isEmpty());
@@ -43,8 +44,8 @@ public final class SubripParserTest extends InstrumentationTestCase {
 
   public void testParseTypical() throws IOException {
     SubripParser parser = new SubripParser();
-    InputStream inputStream = getInputStream(TYPICAL_FILE);
-    SubripSubtitle subtitle = parser.parse(inputStream);
+    byte[] bytes = TestUtil.getByteArray(getInstrumentation(), TYPICAL_FILE);
+    SubripSubtitle subtitle = parser.parse(bytes, 0, bytes.length);
     assertEquals(6, subtitle.getEventTimeCount());
     assertTypicalCue1(subtitle, 0);
     assertTypicalCue2(subtitle, 2);
@@ -53,8 +54,8 @@ public final class SubripParserTest extends InstrumentationTestCase {
 
   public void testParseTypicalExtraBlankLine() throws IOException {
     SubripParser parser = new SubripParser();
-    InputStream inputStream = getInputStream(TYPICAL_EXTRA_BLANK_LINE);
-    SubripSubtitle subtitle = parser.parse(inputStream);
+    byte[] bytes = TestUtil.getByteArray(getInstrumentation(), TYPICAL_EXTRA_BLANK_LINE);
+    SubripSubtitle subtitle = parser.parse(bytes, 0, bytes.length);
     assertEquals(6, subtitle.getEventTimeCount());
     assertTypicalCue1(subtitle, 0);
     assertTypicalCue2(subtitle, 2);
@@ -64,8 +65,8 @@ public final class SubripParserTest extends InstrumentationTestCase {
   public void testParseTypicalMissingTimecode() throws IOException {
     // Parsing should succeed, parsing the first and third cues only.
     SubripParser parser = new SubripParser();
-    InputStream inputStream = getInputStream(TYPICAL_MISSING_TIMECODE);
-    SubripSubtitle subtitle = parser.parse(inputStream);
+    byte[] bytes = TestUtil.getByteArray(getInstrumentation(), TYPICAL_MISSING_TIMECODE);
+    SubripSubtitle subtitle = parser.parse(bytes, 0, bytes.length);
     assertEquals(4, subtitle.getEventTimeCount());
     assertTypicalCue1(subtitle, 0);
     assertTypicalCue3(subtitle, 2);
@@ -74,8 +75,8 @@ public final class SubripParserTest extends InstrumentationTestCase {
   public void testParseTypicalMissingSequence() throws IOException {
     // Parsing should succeed, parsing the first and third cues only.
     SubripParser parser = new SubripParser();
-    InputStream inputStream = getInputStream(TYPICAL_MISSING_SEQUENCE);
-    SubripSubtitle subtitle = parser.parse(inputStream);
+    byte[] bytes = TestUtil.getByteArray(getInstrumentation(), TYPICAL_MISSING_SEQUENCE);
+    SubripSubtitle subtitle = parser.parse(bytes, 0, bytes.length);
     assertEquals(4, subtitle.getEventTimeCount());
     assertTypicalCue1(subtitle, 0);
     assertTypicalCue3(subtitle, 2);
@@ -83,8 +84,8 @@ public final class SubripParserTest extends InstrumentationTestCase {
 
   public void testParseNoEndTimecodes() throws IOException {
     SubripParser parser = new SubripParser();
-    InputStream inputStream = getInputStream(NO_END_TIMECODES_FILE);
-    SubripSubtitle subtitle = parser.parse(inputStream);
+    byte[] bytes = TestUtil.getByteArray(getInstrumentation(), NO_END_TIMECODES_FILE);
+    SubripSubtitle subtitle = parser.parse(bytes, 0, bytes.length);
 
     // Test event count.
     assertEquals(3, subtitle.getEventTimeCount());
@@ -105,10 +106,6 @@ public final class SubripParserTest extends InstrumentationTestCase {
         subtitle.getCues(subtitle.getEventTime(2)).get(0).text.toString());
   }
 
-  private InputStream getInputStream(String fileName) throws IOException {
-    return getInstrumentation().getContext().getResources().getAssets().open(fileName);
-  }
-
   private static void assertTypicalCue1(SubripSubtitle subtitle, int eventIndex) {
     assertEquals(0, subtitle.getEventTime(eventIndex));
     assertEquals("This is the first subtitle.",

library/src/androidTest/java/com/google/android/exoplayer/text/ttml/TtmlParserTest.java

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer.text.ttml;
 
+import com.google.android.exoplayer.testutil.TestUtil;
 import com.google.android.exoplayer.text.Cue;
 
 import android.test.InstrumentationTestCase;
@@ -32,7 +33,6 @@ import android.text.style.TypefaceSpan;
 import android.text.style.UnderlineSpan;
 
 import java.io.IOException;
-import java.io.InputStream;
 import java.util.List;
 import java.util.Map;
 
@@ -471,8 +471,7 @@ public final class TtmlParserTest extends InstrumentationTestCase {
 
   private TtmlSubtitle getSubtitle(String file) throws IOException {
     TtmlParser ttmlParser = new TtmlParser();
-    InputStream inputStream = getInstrumentation().getContext()
-        .getResources().getAssets().open(file);
-    return (TtmlSubtitle) ttmlParser.parse(inputStream);
+    byte[] bytes = TestUtil.getByteArray(getInstrumentation(), file);
+    return ttmlParser.parse(bytes, 0, bytes.length);
   }
 }

library/src/androidTest/java/com/google/android/exoplayer/text/webvtt/WebvttParserTest.java

@@ -15,13 +15,14 @@
  */
 package com.google.android.exoplayer.text.webvtt;
 
+import com.google.android.exoplayer.ParserException;
+import com.google.android.exoplayer.testutil.TestUtil;
 import com.google.android.exoplayer.text.Cue;
 
 import android.test.InstrumentationTestCase;
 import android.text.Layout.Alignment;
 
 import java.io.IOException;
-import java.io.InputStream;
 import java.util.List;
 
 /**
@@ -39,21 +40,19 @@ public class WebvttParserTest extends InstrumentationTestCase {
 
   public void testParseEmpty() throws IOException {
     WebvttParser parser = new WebvttParser();
-    InputStream inputStream = getInstrumentation().getContext().getResources().getAssets()
-        .open(EMPTY_FILE);
+    byte[] bytes = TestUtil.getByteArray(getInstrumentation(), EMPTY_FILE);
     try {
-      parser.parse(inputStream);
-      fail("Expected IOException");
-    } catch (IOException expected) {
+      parser.parse(bytes, 0, bytes.length);
+      fail("Expected ParserException");
+    } catch (ParserException expected) {
       // Do nothing.
     }
   }
 
   public void testParseTypical() throws IOException {
     WebvttParser parser = new WebvttParser();
-    InputStream inputStream =
-        getInstrumentation().getContext().getResources().getAssets().open(TYPICAL_FILE);
-    WebvttSubtitle subtitle = parser.parse(inputStream);
+    byte[] bytes = TestUtil.getByteArray(getInstrumentation(), TYPICAL_FILE);
+    WebvttSubtitle subtitle = parser.parse(bytes, 0, bytes.length);
 
     // test event count
     assertEquals(4, subtitle.getEventTimeCount());
@@ -65,9 +64,8 @@ public class WebvttParserTest extends InstrumentationTestCase {
 
   public void testParseTypicalWithIds() throws IOException {
     WebvttParser parser = new WebvttParser();
-    InputStream inputStream = getInstrumentation().getContext().getResources().getAssets()
-        .open(TYPICAL_WITH_IDS_FILE);
-    WebvttSubtitle subtitle = parser.parse(inputStream);
+    byte[] bytes = TestUtil.getByteArray(getInstrumentation(), TYPICAL_WITH_IDS_FILE);
+    WebvttSubtitle subtitle = parser.parse(bytes, 0, bytes.length);
 
     // test event count
     assertEquals(4, subtitle.getEventTimeCount());
@@ -79,9 +77,8 @@ public class WebvttParserTest extends InstrumentationTestCase {
 
   public void testParseTypicalWithComments() throws IOException {
     WebvttParser parser = new WebvttParser();
-    InputStream inputStream = getInstrumentation().getContext().getResources().getAssets()
-        .open(TYPICAL_WITH_COMMENTS_FILE);
-    WebvttSubtitle subtitle = parser.parse(inputStream);
+    byte[] bytes = TestUtil.getByteArray(getInstrumentation(), TYPICAL_WITH_COMMENTS_FILE);
+    WebvttSubtitle subtitle = parser.parse(bytes, 0, bytes.length);
 
     // test event count
     assertEquals(4, subtitle.getEventTimeCount());
@@ -93,9 +90,8 @@ public class WebvttParserTest extends InstrumentationTestCase {
 
   public void testParseWithTags() throws IOException {
     WebvttParser parser = new WebvttParser();
-    InputStream inputStream = getInstrumentation().getContext().getResources().getAssets()
-        .open(WITH_TAGS_FILE);
-    WebvttSubtitle subtitle = parser.parse(inputStream);
+    byte[] bytes = TestUtil.getByteArray(getInstrumentation(), WITH_TAGS_FILE);
+    WebvttSubtitle subtitle = parser.parse(bytes, 0, bytes.length);
 
     // test event count
     assertEquals(8, subtitle.getEventTimeCount());
@@ -109,9 +105,8 @@ public class WebvttParserTest extends InstrumentationTestCase {
 
   public void testParseWithPositioning() throws IOException {
     WebvttParser parser = new WebvttParser();
-    InputStream inputStream = getInstrumentation().getContext().getResources().getAssets()
-        .open(WITH_POSITIONING_FILE);
-    WebvttSubtitle subtitle = parser.parse(inputStream);
+    byte[] bytes = TestUtil.getByteArray(getInstrumentation(), WITH_POSITIONING_FILE);
+    WebvttSubtitle subtitle = parser.parse(bytes, 0, bytes.length);
 
     // test event count
     assertEquals(10, subtitle.getEventTimeCount());
@@ -135,9 +130,8 @@ public class WebvttParserTest extends InstrumentationTestCase {
 
   public void testParseWithBadCueHeader() throws IOException {
     WebvttParser parser = new WebvttParser();
-    InputStream inputStream =
-        getInstrumentation().getContext().getResources().getAssets().open(WITH_BAD_CUE_HEADER_FILE);
-    WebvttSubtitle subtitle = parser.parse(inputStream);
+    byte[] bytes = TestUtil.getByteArray(getInstrumentation(), WITH_BAD_CUE_HEADER_FILE);
+    WebvttSubtitle subtitle = parser.parse(bytes, 0, bytes.length);
 
     // test event count
     assertEquals(4, subtitle.getEventTimeCount());

library/src/androidTest/java/com/google/android/exoplayer/util/ParsableByteArrayTest.java

@@ -322,4 +322,61 @@ public class ParsableByteArrayTest extends TestCase {
     assertEquals((short) 0xFF02, byteArray.readLittleEndianShort());
   }
 
+  public void testReadEmptyString() {
+    byte[] bytes = new byte[0];
+    ParsableByteArray parser = new ParsableByteArray(bytes);
+    assertNull(parser.readLine());
+  }
+
+  public void testReadSingleLineWithoutEndingTrail() {
+    byte[] bytes = new byte[] {
+      'f', 'o', 'o'
+    };
+    ParsableByteArray parser = new ParsableByteArray(bytes);
+    assertEquals("foo", parser.readLine());
+    assertNull(parser.readLine());
+  }
+
+  public void testReadSingleLineWithEndingLf() {
+    byte[] bytes = new byte[] {
+      'f', 'o', 'o', '\n'
+    };
+    ParsableByteArray parser = new ParsableByteArray(bytes);
+    assertEquals("foo", parser.readLine());
+    assertNull(parser.readLine());
+  }
+
+  public void testReadTwoLinesWithLfFollowedByCr() {
+    byte[] bytes = new byte[] {
+      'f', 'o', 'o', '\n', '\r', 'b', 'a', 'r'
+    };
+    ParsableByteArray parser = new ParsableByteArray(bytes);
+    assertEquals("foo", parser.readLine());
+    assertEquals("bar", parser.readLine());
+    assertNull(parser.readLine());
+  }
+
+  public void testReadThreeLinesWithEmptyLine() {
+    byte[] bytes = new byte[] {
+      'f', 'o', 'o', '\n', '\r', '\n', 'b', 'a', 'r'
+    };
+    ParsableByteArray parser = new ParsableByteArray(bytes);
+    assertEquals("foo", parser.readLine());
+    assertEquals("", parser.readLine());
+    assertEquals("bar", parser.readLine());
+    assertNull(parser.readLine());
+  }
+
+  public void testReadFourLinesWithCrFollowedByLf() {
+    byte[] bytes = new byte[] {
+      'f', 'o', 'o', '\r', '\n', '\n', 'b', 'a', 'r', '\n', '\r'
+    };
+    ParsableByteArray parser = new ParsableByteArray(bytes);
+    assertEquals("foo", parser.readLine());
+    assertEquals("", parser.readLine());
+    assertEquals("", parser.readLine());
+    assertEquals("bar", parser.readLine());
+    assertNull(parser.readLine());
+  }
+
 }

library/src/main/java/com/google/android/exoplayer/hls/WebvttExtractor.java

@@ -31,10 +31,7 @@ import com.google.android.exoplayer.util.ParsableByteArray;
 
 import android.text.TextUtils;
 
-import java.io.BufferedReader;
-import java.io.ByteArrayInputStream;
 import java.io.IOException;
-import java.io.InputStreamReader;
 import java.util.Arrays;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -111,12 +108,11 @@ import java.util.regex.Pattern;
     return Extractor.RESULT_END_OF_INPUT;
   }
 
-  private void processSample() throws IOException {
-    BufferedReader reader = new BufferedReader(
-        new InputStreamReader(new ByteArrayInputStream(sampleData), C.UTF8_NAME));
+  private void processSample() throws ParserException {
+    ParsableByteArray webvttData = new ParsableByteArray(sampleData);
 
     // Validate the first line of the header.
-    WebvttParserUtil.validateWebvttHeaderLine(reader);
+    WebvttParserUtil.validateWebvttHeaderLine(webvttData);
 
     // Defaults to use if the header doesn't contain an X-TIMESTAMP-MAP header.
     long vttTimestampUs = 0;
@@ -124,7 +120,7 @@ import java.util.regex.Pattern;
 
     // Parse the remainder of the header looking for X-TIMESTAMP-MAP.
     String line;
-    while (!TextUtils.isEmpty(line = reader.readLine())) {
+    while (!TextUtils.isEmpty(line = webvttData.readLine())) {
       if (line.startsWith("X-TIMESTAMP-MAP")) {
         Matcher localTimestampMatcher = LOCAL_TIMESTAMP.matcher(line);
         if (!localTimestampMatcher.find()) {
@@ -141,7 +137,7 @@ import java.util.regex.Pattern;
     }
 
     // Find the first cue header and parse the start time.
-    Matcher cueHeaderMatcher = WebvttParserUtil.findNextCueHeader(reader);
+    Matcher cueHeaderMatcher = WebvttParserUtil.findNextCueHeader(webvttData);
     if (cueHeaderMatcher == null) {
       // No cues found. Don't output a sample, but still output a corresponding track.
       buildTrackOutput(0);

library/src/main/java/com/google/android/exoplayer/text/SubtitleParser.java

@@ -15,11 +15,10 @@
  */
 package com.google.android.exoplayer.text;
 
-import java.io.IOException;
-import java.io.InputStream;
+import com.google.android.exoplayer.ParserException;
 
 /**
- * Parses {@link Subtitle}s from {@link InputStream}s.
+ * Parses {@link Subtitle}s from a byte array.
  */
 public interface SubtitleParser {
 
@@ -32,12 +31,14 @@ public interface SubtitleParser {
   public boolean canParse(String mimeType);
 
   /**
-   * Parses a {@link Subtitle} from the provided {@link InputStream}.
+   * Parses a {@link Subtitle} from the provided {@code byte[]}.
    *
-   * @param inputStream The stream from which to parse the subtitle.
+   * @param bytes The array holding the subtitle data.
+   * @param offset The offset of the subtitle data in bytes.
+   * @param length The length of the subtitle data in bytes.
    * @return A parsed representation of the subtitle.
-   * @throws IOException If a problem occurred reading from the stream.
+   * @throws ParserException If a problem occurred parsing the subtitle data.
    */
-  public Subtitle parse(InputStream inputStream) throws IOException;
+  public Subtitle parse(byte[] bytes, int offset, int length) throws ParserException;
 
 }

library/src/main/java/com/google/android/exoplayer/text/SubtitleParserHelper.java

@@ -16,6 +16,7 @@
 package com.google.android.exoplayer.text;
 
 import com.google.android.exoplayer.MediaFormat;
+import com.google.android.exoplayer.ParserException;
 import com.google.android.exoplayer.SampleHolder;
 import com.google.android.exoplayer.util.Assertions;
 import com.google.android.exoplayer.util.Util;
@@ -25,9 +26,7 @@ import android.os.Handler;
 import android.os.Looper;
 import android.os.Message;
 
-import java.io.ByteArrayInputStream;
 import java.io.IOException;
-import java.io.InputStream;
 
 /**
  * Wraps a {@link SubtitleParser}, exposing an interface similar to {@link MediaCodec} for
@@ -165,12 +164,11 @@ import java.io.InputStream;
 
   private void handleSample(long sampleTimeUs, SampleHolder holder) {
     Subtitle parsedSubtitle = null;
-    IOException error = null;
+    ParserException error = null;
     RuntimeException runtimeError = null;
     try {
-      InputStream inputStream = new ByteArrayInputStream(holder.data.array(), 0, holder.size);
-      parsedSubtitle = parser.parse(inputStream);
-    } catch (IOException e) {
+      parsedSubtitle = parser.parse(holder.data.array(), 0, holder.size);
+    } catch (ParserException e) {
       error = e;
     } catch (RuntimeException e) {
       runtimeError = e;

library/src/main/java/com/google/android/exoplayer/text/mp4webvtt/Mp4WebvttParser.java

@@ -22,8 +22,6 @@ import com.google.android.exoplayer.util.MimeTypes;
 import com.google.android.exoplayer.util.ParsableByteArray;
 import com.google.android.exoplayer.util.Util;
 
-import java.io.IOException;
-import java.io.InputStream;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -38,7 +36,6 @@ public final class Mp4WebvttParser implements SubtitleParser {
   private static final int TYPE_payl = Util.getIntegerCodeForString("payl");
 
   private final ParsableByteArray sampleData;
-  private byte[] inputBytesBuffer;
 
   public Mp4WebvttParser() {
     sampleData = new ParsableByteArray();
@@ -50,15 +47,11 @@ public final class Mp4WebvttParser implements SubtitleParser {
   }
 
   @Override
-  public Mp4WebvttSubtitle parse(InputStream inputStream) throws IOException {
+  public Mp4WebvttSubtitle parse(byte[] bytes, int offset, int length) throws ParserException {
     // Webvtt in Mp4 samples have boxes inside of them, so we have to do a traditional box parsing:
     // first 4 bytes size and then 4 bytes type.
-    int inputStreamByteCount = inputStream.available();
-    if (inputBytesBuffer == null || inputBytesBuffer.length < inputStreamByteCount) {
-      inputBytesBuffer = new byte[inputStreamByteCount];
-    }
-    inputStream.read(inputBytesBuffer, 0, inputStreamByteCount);
-    sampleData.reset(inputBytesBuffer, inputStreamByteCount);
+    sampleData.reset(bytes, offset + length);
+    sampleData.setPosition(offset);
     List<Cue> resultingCueList = new ArrayList<>();
     while (sampleData.bytesLeft() > 0) {
       if (sampleData.bytesLeft() < BOX_HEADER_SIZE) {
@@ -76,7 +69,7 @@ public final class Mp4WebvttParser implements SubtitleParser {
     return new Mp4WebvttSubtitle(resultingCueList);
   }
 
-  private static Cue parseVttCueBox(ParsableByteArray sampleData) throws IOException {
+  private static Cue parseVttCueBox(ParsableByteArray sampleData) throws ParserException {
     while (sampleData.bytesLeft() > 0) {
       if (sampleData.bytesLeft() < BOX_HEADER_SIZE) {
         throw new ParserException("Incomplete vtt cue box header found.");

library/src/main/java/com/google/android/exoplayer/text/subrip/SubripParser.java

@@ -15,21 +15,17 @@
  */
 package com.google.android.exoplayer.text.subrip;
 
-import com.google.android.exoplayer.C;
 import com.google.android.exoplayer.text.Cue;
 import com.google.android.exoplayer.text.SubtitleParser;
 import com.google.android.exoplayer.util.LongArray;
 import com.google.android.exoplayer.util.MimeTypes;
+import com.google.android.exoplayer.util.ParsableByteArray;
 
 import android.text.Html;
 import android.text.Spanned;
 import android.text.TextUtils;
 import android.util.Log;
 
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
 import java.util.ArrayList;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -57,14 +53,15 @@ public final class SubripParser implements SubtitleParser {
   }
 
   @Override
-  public SubripSubtitle parse(InputStream inputStream) throws IOException {
+  public SubripSubtitle parse(byte[] bytes, int offset, int length) {
     ArrayList<Cue> cues = new ArrayList<>();
     LongArray cueTimesUs = new LongArray();
-    BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, C.UTF8_NAME));
+    ParsableByteArray subripData = new ParsableByteArray(bytes, offset + length);
+    subripData.setPosition(offset);
     boolean haveEndTimecode;
     String currentLine;
 
-    while ((currentLine = reader.readLine()) != null) {
+    while ((currentLine = subripData.readLine()) != null) {
       if (currentLine.length() == 0) {
         // Skip blank lines.
         continue;
@@ -80,7 +77,7 @@ public final class SubripParser implements SubtitleParser {
 
       // Read and parse the timing line.
       haveEndTimecode = false;
-      currentLine = reader.readLine();
+      currentLine = subripData.readLine();
       Matcher matcher = SUBRIP_TIMING_LINE.matcher(currentLine);
       if (matcher.find()) {
         cueTimesUs.add(parseTimecode(matcher.group(1)));
@@ -96,7 +93,7 @@ public final class SubripParser implements SubtitleParser {
 
       // Read and parse the text.
       textBuilder.setLength(0);
-      while (!TextUtils.isEmpty(currentLine = reader.readLine())) {
+      while (!TextUtils.isEmpty(currentLine = subripData.readLine())) {
         if (textBuilder.length() > 0) {
           textBuilder.append("<br>");
         }

library/src/main/java/com/google/android/exoplayer/text/ttml/TtmlParser.java

@@ -17,7 +17,6 @@ package com.google.android.exoplayer.text.ttml;
 
 import com.google.android.exoplayer.C;
 import com.google.android.exoplayer.ParserException;
-import com.google.android.exoplayer.text.Subtitle;
 import com.google.android.exoplayer.text.SubtitleParser;
 import com.google.android.exoplayer.util.MimeTypes;
 import com.google.android.exoplayer.util.ParserUtil;
@@ -30,8 +29,8 @@ import org.xmlpull.v1.XmlPullParser;
 import org.xmlpull.v1.XmlPullParserException;
 import org.xmlpull.v1.XmlPullParserFactory;
 
+import java.io.ByteArrayInputStream;
 import java.io.IOException;
-import java.io.InputStream;
 import java.util.HashMap;
 import java.util.LinkedList;
 import java.util.Map;
@@ -97,10 +96,11 @@ public final class TtmlParser implements SubtitleParser {
   }
 
   @Override
-  public Subtitle parse(InputStream inputStream) throws IOException {
+  public TtmlSubtitle parse(byte[] bytes, int offset, int length) throws ParserException {
     try {
       XmlPullParser xmlParser = xmlParserFactory.newPullParser();
       Map<String, TtmlStyle> globalStyles = new HashMap<>();
+      ByteArrayInputStream inputStream = new ByteArrayInputStream(bytes, offset, length);
       xmlParser.setInput(inputStream, null);
       TtmlSubtitle ttmlSubtitle = null;
       LinkedList<TtmlNode> nodeStack = new LinkedList<>();
@@ -150,6 +150,8 @@ public final class TtmlParser implements SubtitleParser {
       return ttmlSubtitle;
     } catch (XmlPullParserException xppe) {
       throw new ParserException("Unable to parse source", xppe);
+    } catch (IOException e) {
+      throw new IllegalStateException("Unexpected error when reading input.", e);
     }
   }
 

library/src/main/java/com/google/android/exoplayer/text/tx3g/Tx3gParser.java

@@ -20,10 +20,6 @@ import com.google.android.exoplayer.text.Subtitle;
 import com.google.android.exoplayer.text.SubtitleParser;
 import com.google.android.exoplayer.util.MimeTypes;
 
-import java.io.DataInputStream;
-import java.io.IOException;
-import java.io.InputStream;
-
 /**
  * A {@link SubtitleParser} for tx3g.
  * <p>
@@ -37,9 +33,8 @@ public final class Tx3gParser implements SubtitleParser {
   }
 
   @Override
-  public Subtitle parse(InputStream inputStream) throws IOException {
-    DataInputStream dataInputStream  = new DataInputStream(inputStream);
-    String cueText = dataInputStream.readUTF();
+  public Subtitle parse(byte[] bytes, int offset, int length) {
+    String cueText = new String(bytes, offset, length);
     return new Tx3gSubtitle(new Cue(cueText));
   }
 

library/src/main/java/com/google/android/exoplayer/text/webvtt/WebvttParser.java

@@ -15,19 +15,16 @@
  */
 package com.google.android.exoplayer.text.webvtt;
 
-import com.google.android.exoplayer.C;
+import com.google.android.exoplayer.ParserException;
 import com.google.android.exoplayer.text.Cue;
 import com.google.android.exoplayer.text.SubtitleParser;
 import com.google.android.exoplayer.util.MimeTypes;
+import com.google.android.exoplayer.util.ParsableByteArray;
 
 import android.text.Layout.Alignment;
 import android.text.TextUtils;
 import android.util.Log;
 
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
 import java.util.ArrayList;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -59,8 +56,9 @@ public final class WebvttParser implements SubtitleParser {
   }
 
   @Override
-  public final WebvttSubtitle parse(InputStream inputStream) throws IOException {
-    BufferedReader webvttData = new BufferedReader(new InputStreamReader(inputStream, C.UTF8_NAME));
+  public final WebvttSubtitle parse(byte[] bytes, int offset, int length) throws ParserException {
+    ParsableByteArray webvttData = new ParsableByteArray(bytes, offset + length);
+    webvttData.setPosition(offset);
 
     // Validate the first line of the header, and skip the remainder.
     WebvttParserUtil.validateWebvttHeaderLine(webvttData);

library/src/main/java/com/google/android/exoplayer/text/webvtt/WebvttParserUtil.java

@@ -16,9 +16,8 @@
 package com.google.android.exoplayer.text.webvtt;
 
 import com.google.android.exoplayer.ParserException;
+import com.google.android.exoplayer.util.ParsableByteArray;
 
-import java.io.BufferedReader;
-import java.io.IOException;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -38,9 +37,8 @@ public final class WebvttParserUtil {
    *
    * @param input The input from which the line should be read.
    * @throws ParserException If the line isn't the start of a valid WebVTT file.
-   * @throws IOException If an error occurs reading from the input.
    */
-  public static void validateWebvttHeaderLine(BufferedReader input) throws IOException {
+  public static void validateWebvttHeaderLine(ParsableByteArray input) throws ParserException {
     String line = input.readLine();
     if (line == null || !HEADER.matcher(line).matches()) {
       throw new ParserException("Expected WEBVTT. Got " + line);
@@ -51,12 +49,11 @@ public final class WebvttParserUtil {
    * Reads lines up to and including the next WebVTT cue header.
    *
    * @param input The input from which lines should be read.
-   * @throws IOException If an error occurs reading from the input.
    * @return A {@link Matcher} for the WebVTT cue header, or null if the end of the input was
    *     reached without a cue header being found. In the case that a cue header is found, groups 1,
    *     2 and 3 of the returned matcher contain the start time, end time and settings list.
    */
-  public static Matcher findNextCueHeader(BufferedReader input) throws IOException {
+  public static Matcher findNextCueHeader(ParsableByteArray input) {
     String line;
     while ((line = input.readLine()) != null) {
       if (COMMENT.matcher(line).matches()) {

library/src/main/java/com/google/android/exoplayer/util/ParsableByteArray.java

@@ -306,4 +306,38 @@ public final class ParsableByteArray {
     return result;
   }
 
+  /**
+   * Reads a line of text. A line is considered to be terminated by any one of a line feed ('\n'), a
+   * carriage return ('\r'), or a carriage return followed immediately by a line feed. Platform
+   * default's charset used.
+   *
+   * @return A String containing the contents of the line, not including any line-termination
+   *    characters, or null if the end of the stream has been reached.
+   */
+  public String readLine() {
+    if (bytesLeft() == 0) {
+      return null;
+    }
+    int lineLimit = position;
+    while (lineLimit < limit && data[lineLimit] != '\n' && data[lineLimit] != '\r') {
+      lineLimit++;
+    }
+    String line = new String(data, position, lineLimit - position);
+    position = lineLimit;
+    if (position == limit) {
+      return line;
+    }
+    if (data[position] == '\n') {
+      position++;
+      if (position == limit) {
+        return line;
+      }
+    }
+    if (data[position] == '\r') {
+      position++;
+    }
+    return line;
+  }
+
+
 }

library/src/main/java/com/google/android/exoplayer/util/ParserUtil.java

@@ -47,4 +47,5 @@ public final class ParserUtil {
   public static String removeNamespacePrefix(String attributeName) {
     return attributeName.replaceFirst("^.*:", "");
   }
+
 }