Remove caption parser strict modes.

They don't seem particularly useful; they don't technically force
strict compliance, but rather just catch a few token things in
each case. Furthermore, for playback, probably the right thing to
do is to always turn strict mode off.

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

@@ -15,8 +15,6 @@
  */
 package com.google.android.exoplayer.text.subrip;
 
-import com.google.android.exoplayer.ParserException;
-
 import android.test.InstrumentationTestCase;
 
 import java.io.IOException;
@@ -35,7 +33,7 @@ public final class SubripParserTest extends InstrumentationTestCase {
   private static final String NO_END_TIMECODES_FILE = "subrip/no_end_timecodes";
 
   public void testParseEmpty() throws IOException {
-    SubripParser parser = new SubripParser(true);
+    SubripParser parser = new SubripParser();
     InputStream inputStream = getInputStream(EMPTY_FILE);
     SubripSubtitle subtitle = parser.parse(inputStream);
     // Assert that the subtitle is empty.
@@ -44,7 +42,7 @@ public final class SubripParserTest extends InstrumentationTestCase {
   }
 
   public void testParseTypical() throws IOException {
-    SubripParser parser = new SubripParser(true);
+    SubripParser parser = new SubripParser();
     InputStream inputStream = getInputStream(TYPICAL_FILE);
     SubripSubtitle subtitle = parser.parse(inputStream);
     assertEquals(6, subtitle.getEventTimeCount());
@@ -54,7 +52,7 @@ public final class SubripParserTest extends InstrumentationTestCase {
   }
 
   public void testParseTypicalExtraBlankLine() throws IOException {
-    SubripParser parser = new SubripParser(true);
+    SubripParser parser = new SubripParser();
     InputStream inputStream = getInputStream(TYPICAL_EXTRA_BLANK_LINE);
     SubripSubtitle subtitle = parser.parse(inputStream);
     assertEquals(6, subtitle.getEventTimeCount());
@@ -64,19 +62,9 @@ public final class SubripParserTest extends InstrumentationTestCase {
   }
 
   public void testParseTypicalMissingTimecode() throws IOException {
-    // Strict parsing should fail.
+    // Parsing should succeed, parsing the first and third cues only.
-    SubripParser parser = new SubripParser(true);
+    SubripParser parser = new SubripParser();
     InputStream inputStream = getInputStream(TYPICAL_MISSING_TIMECODE);
-    try {
-      parser.parse(inputStream);
-      fail();
-    } catch (ParserException e) {
-      // Expected.
-    }
-
-    // Non-strict parsing should succeed, parsing the first and third cues only.
-    parser = new SubripParser(false);
-    inputStream = getInputStream(TYPICAL_MISSING_TIMECODE);
     SubripSubtitle subtitle = parser.parse(inputStream);
     assertEquals(4, subtitle.getEventTimeCount());
     assertTypicalCue1(subtitle, 0);
@@ -84,19 +72,9 @@ public final class SubripParserTest extends InstrumentationTestCase {
   }
 
   public void testParseTypicalMissingSequence() throws IOException {
-    // Strict parsing should fail.
+    // Parsing should succeed, parsing the first and third cues only.
-    SubripParser parser = new SubripParser(true);
+    SubripParser parser = new SubripParser();
     InputStream inputStream = getInputStream(TYPICAL_MISSING_SEQUENCE);
-    try {
-      parser.parse(inputStream);
-      fail();
-    } catch (ParserException e) {
-      // Expected.
-    }
-
-    // Non-strict parsing should succeed, parsing the first and third cues only.
-    parser = new SubripParser(false);
-    inputStream = getInputStream(TYPICAL_MISSING_SEQUENCE);
     SubripSubtitle subtitle = parser.parse(inputStream);
     assertEquals(4, subtitle.getEventTimeCount());
     assertTypicalCue1(subtitle, 0);
@@ -104,7 +82,7 @@ public final class SubripParserTest extends InstrumentationTestCase {
   }
 
   public void testParseNoEndTimecodes() throws IOException {
-    SubripParser parser = new SubripParser(true);
+    SubripParser parser = new SubripParser();
     InputStream inputStream = getInputStream(NO_END_TIMECODES_FILE);
     SubripSubtitle subtitle = parser.parse(inputStream);
 

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

@@ -470,10 +470,9 @@ public final class TtmlParserTest extends InstrumentationTestCase {
   }
 
   private TtmlSubtitle getSubtitle(String file) throws IOException {
-    TtmlParser ttmlParser = new TtmlParser(false);
+    TtmlParser ttmlParser = new TtmlParser();
     InputStream inputStream = getInstrumentation().getContext()
         .getResources().getAssets().open(file);
-
     return (TtmlSubtitle) ttmlParser.parse(inputStream);
   }
 }

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

@@ -16,7 +16,6 @@
 package com.google.android.exoplayer.text.subrip;
 
 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.LongArray;
@@ -47,24 +46,14 @@ public final class SubripParser implements SubtitleParser {
       Pattern.compile("(?:(\\d+):)?(\\d+):(\\d+),(\\d+)");
 
   private final StringBuilder textBuilder;
-  private final boolean strictParsing;
 
-  /**
-   * Equivalent to {@code SubripParser(false)}.
-   */
   public SubripParser() {
-    this(false);
+    textBuilder = new StringBuilder();
   }
 
-  /**
+  @Override
-   * @param strictParsing If true, {@link #parse(InputStream)} will throw a {@link ParserException}
+  public boolean canParse(String mimeType) {
-   *     if the stream contains invalid data. If false, the parser will make a best effort to ignore
+    return MimeTypes.APPLICATION_SUBRIP.equals(mimeType);
-   *     minor errors in the stream. Note however that a {@link ParserException} will still be
-   *     thrown when this is not possible.
-   */
-  public SubripParser(boolean strictParsing) {
-    this.strictParsing = strictParsing;
-    textBuilder = new StringBuilder();
   }
 
   @Override
@@ -85,12 +74,8 @@ public final class SubripParser implements SubtitleParser {
       try {
         Integer.parseInt(currentLine);
       } catch (NumberFormatException e) {
-        if (!strictParsing) {
         Log.w(TAG, "Skipping invalid index: " + currentLine);
         continue;
-        } else {
-          throw new ParserException("Expected numeric counter: " + currentLine);
-        }
       }
 
       // Read and parse the timing line.
@@ -104,11 +89,9 @@ public final class SubripParser implements SubtitleParser {
           haveEndTimecode = true;
           cueTimesUs.add(parseTimecode(matcher.group(2)));
         }
-      } else if (!strictParsing) {
+      } else {
         Log.w(TAG, "Skipping invalid timing: " + currentLine);
         continue;
-      } else {
-        throw new ParserException("Expected timing line: " + currentLine);
       }
 
       // Read and parse the text.
@@ -133,11 +116,6 @@ public final class SubripParser implements SubtitleParser {
     return new SubripSubtitle(cuesArray, cueTimesUsArray);
   }
 
-  @Override
-  public boolean canParse(String mimeType) {
-    return MimeTypes.APPLICATION_SUBRIP.equals(mimeType);
-  }
-
   private static long parseTimecode(String s) throws NumberFormatException {
     Matcher matcher = SUBRIP_TIMESTAMP.matcher(s);
     if (!matcher.matches()) {

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

@@ -82,23 +82,8 @@ public final class TtmlParser implements SubtitleParser {
   private static final int DEFAULT_TICKRATE = 1;
 
   private final XmlPullParserFactory xmlParserFactory;
-  private final boolean strictParsing;
 
-  /**
-   * Equivalent to {@code TtmlParser(false)}.
-   */
   public TtmlParser() {
-    this(false);
-  }
-
-  /**
-   * @param strictParsing If true, {@link #parse(InputStream)} will throw a {@link ParserException}
-   *     if the stream contains invalid data. If false, the parser will make a best effort to ignore
-   *     minor errors in the stream. Note however that a {@link ParserException} will still be
-   *     thrown when this is not possible.
-   */
-  public TtmlParser(boolean strictParsing) {
-    this.strictParsing = strictParsing;
     try {
       xmlParserFactory = XmlPullParserFactory.newInstance();
     } catch (XmlPullParserException e) {
@@ -106,6 +91,11 @@ public final class TtmlParser implements SubtitleParser {
     }
   }
 
+  @Override
+  public boolean canParse(String mimeType) {
+    return MimeTypes.APPLICATION_TTML.equals(mimeType);
+  }
+
   @Override
   public Subtitle parse(InputStream inputStream) throws IOException {
     try {
@@ -134,15 +124,11 @@ public final class TtmlParser implements SubtitleParser {
                   parent.addChild(node);
                 }
               } catch (ParserException e) {
-                if (strictParsing) {
-                  throw e;
-                } else {
                 Log.w(TAG, "Suppressing parser error", e);
                 // Treat the node (and by extension, all of its children) as unsupported.
                 unsupportedNodeDepth++;
               }
             }
-            }
           } else if (eventType == XmlPullParser.TEXT) {
             parent.addChild(TtmlNode.buildTextNode(xmlParser.getText()));
           } else if (eventType == XmlPullParser.END_TAG) {
@@ -287,11 +273,6 @@ public final class TtmlParser implements SubtitleParser {
     return style == null ? new TtmlStyle() : style;
   }
 
-  @Override
-  public boolean canParse(String mimeType) {
-    return MimeTypes.APPLICATION_TTML.equals(mimeType);
-  }
-
   private TtmlNode parseNode(XmlPullParser parser, TtmlNode parent) throws ParserException {
     long duration = 0;
     long startTime = TtmlNode.UNDEFINED_TIME;

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

@@ -31,6 +31,11 @@ import java.io.InputStream;
  */
 public final class Tx3gParser implements SubtitleParser {
 
+  @Override
+  public boolean canParse(String mimeType) {
+    return MimeTypes.APPLICATION_TX3G.equals(mimeType);
+  }
+
   @Override
   public Subtitle parse(InputStream inputStream) throws IOException {
     DataInputStream dataInputStream  = new DataInputStream(inputStream);
@@ -38,9 +43,4 @@ public final class Tx3gParser implements SubtitleParser {
     return new Tx3gSubtitle(new Cue(cueText));
   }
 
-  @Override
-  public boolean canParse(String mimeType) {
-    return MimeTypes.APPLICATION_TX3G.equals(mimeType);
-  }
-
 }

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

@@ -44,33 +44,22 @@ public final class WebvttParser implements SubtitleParser {
 
   private static final Pattern HEADER = Pattern.compile("^\uFEFF?WEBVTT((\u0020|\u0009).*)?$");
   private static final Pattern COMMENT_BLOCK = Pattern.compile("^NOTE((\u0020|\u0009).*)?$");
-  private static final Pattern METADATA_HEADER = Pattern.compile("\\S*[:=]\\S*");
   private static final Pattern CUE_HEADER = Pattern.compile("^(\\S+)\\s+-->\\s+(\\S+)(.*)?$");
   private static final Pattern CUE_SETTING = Pattern.compile("\\S+?:\\S+");
 
   private final PositionHolder positionHolder;
   private final StringBuilder textBuilder;
-  private final boolean strictParsing;
 
-  /**
-   * Equivalent to {@code WebvttParser(false)}.
-   */
   public WebvttParser() {
-    this(false);
-  }
-
-  /**
-   * @param strictParsing If true, {@link #parse(InputStream)} will throw a {@link ParserException}
-   *     if the stream contains invalid data. If false, the parser will make a best effort to ignore
-   *     minor errors in the stream. Note however that a {@link ParserException} will still be
-   *     thrown when this is not possible.
-   */
-  public WebvttParser(boolean strictParsing) {
-    this.strictParsing = strictParsing;
     positionHolder = new PositionHolder();
     textBuilder = new StringBuilder();
   }
 
+  @Override
+  public final boolean canParse(String mimeType) {
+    return MimeTypes.TEXT_VTT.equals(mimeType);
+  }
+
   @Override
   public final WebvttSubtitle parse(InputStream inputStream) throws IOException {
     ArrayList<WebvttCue> subtitles = new ArrayList<>();
@@ -94,13 +83,6 @@ public final class WebvttParser implements SubtitleParser {
         // We read the newline that separates the header from the body.
         break;
       }
-
-      if (strictParsing) {
-        Matcher matcher = METADATA_HEADER.matcher(line);
-        if (!matcher.find()) {
-          throw new ParserException("Unexpected line: " + line);
-        }
-      }
     }
 
     // Process the cues and text.
@@ -187,11 +169,6 @@ public final class WebvttParser implements SubtitleParser {
     return new WebvttSubtitle(subtitles);
   }
 
-  @Override
-  public final boolean canParse(String mimeType) {
-    return MimeTypes.TEXT_VTT.equals(mimeType);
-  }
-
   private static long parseTimestampUs(String s) throws NumberFormatException {
     long value = 0;
     String[] parts = s.split("\\.", 2);