Add support for HLS's #EXT-X-PLAYLIST-TYPE

Issue:#805

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=145991145

library/src/androidTest/java/com/google/android/exoplayer2/source/hls/playlist/HlsMediaPlaylistParserTest.java

@@ -35,6 +35,7 @@ public class HlsMediaPlaylistParserTest extends TestCase {
     Uri playlistUri = Uri.parse("https://example.com/test.m3u8");
     String playlistString = "#EXTM3U\n"
         + "#EXT-X-VERSION:3\n"
+        + "#EXT-X-PLAYLIST-TYPE:VOD\n"
         + "#EXT-X-TARGETDURATION:8\n"
         + "#EXT-X-MEDIA-SEQUENCE:2679\n"
         + "#EXT-X-DISCONTINUITY-SEQUENCE:4\n"
@@ -71,6 +72,7 @@ public class HlsMediaPlaylistParserTest extends TestCase {
       assertEquals(HlsPlaylist.TYPE_MEDIA, playlist.type);
 
       HlsMediaPlaylist mediaPlaylist = (HlsMediaPlaylist) playlist;
+      assertEquals(HlsMediaPlaylist.PLAYLIST_TYPE_VOD, mediaPlaylist.playlistType);
 
       assertEquals(2679, mediaPlaylist.mediaSequence);
       assertEquals(3, mediaPlaylist.version);

library/src/main/java/com/google/android/exoplayer2/source/hls/playlist/HlsMediaPlaylist.java

@@ -15,7 +15,10 @@
  */
 package com.google.android.exoplayer2.source.hls.playlist;
 
+import android.support.annotation.IntDef;
 import com.google.android.exoplayer2.C;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
 import java.util.Collections;
 import java.util.List;
 
@@ -65,6 +68,18 @@ public final class HlsMediaPlaylist extends HlsPlaylist {
 
   }
 
+  /**
+   * Type of the playlist as specified by #EXT-X-PLAYLIST-TYPE.
+   */
+  @Retention(RetentionPolicy.SOURCE)
+  @IntDef({PLAYLIST_TYPE_UNKNOWN, PLAYLIST_TYPE_VOD, PLAYLIST_TYPE_EVENT})
+  public @interface PlaylistType {}
+  public static final int PLAYLIST_TYPE_UNKNOWN = 0;
+  public static final int PLAYLIST_TYPE_VOD = 1;
+  public static final int PLAYLIST_TYPE_EVENT = 2;
+
+  @PlaylistType
+  public final int playlistType;
   public final long startOffsetUs;
   public final long startTimeUs;
   public final boolean hasDiscontinuitySequence;
@@ -78,11 +93,12 @@ public final class HlsMediaPlaylist extends HlsPlaylist {
   public final List<Segment> segments;
   public final long durationUs;
 
-  public HlsMediaPlaylist(String baseUri, long startOffsetUs, long startTimeUs,
-      boolean hasDiscontinuitySequence, int discontinuitySequence, int mediaSequence, int version,
-      long targetDurationUs, boolean hasEndTag, boolean hasProgramDateTime,
-      Segment initializationSegment, List<Segment> segments) {
+  public HlsMediaPlaylist(@PlaylistType int playlistType, String baseUri, long startOffsetUs,
+      long startTimeUs, boolean hasDiscontinuitySequence, int discontinuitySequence,
+      int mediaSequence, int version, long targetDurationUs, boolean hasEndTag,
+      boolean hasProgramDateTime, Segment initializationSegment, List<Segment> segments) {
     super(baseUri, HlsPlaylist.TYPE_MEDIA);
+    this.playlistType = playlistType;
     this.startTimeUs = startTimeUs;
     this.hasDiscontinuitySequence = hasDiscontinuitySequence;
     this.discontinuitySequence = discontinuitySequence;
@@ -137,9 +153,9 @@ public final class HlsMediaPlaylist extends HlsPlaylist {
    * @return The playlist.
    */
   public HlsMediaPlaylist copyWith(long startTimeUs, int discontinuitySequence) {
-    return new HlsMediaPlaylist(baseUri, startOffsetUs, startTimeUs, true, discontinuitySequence,
-        mediaSequence, version, targetDurationUs, hasEndTag, hasProgramDateTime,
-        initializationSegment, segments);
+    return new HlsMediaPlaylist(playlistType, baseUri, startOffsetUs, startTimeUs, true,
+        discontinuitySequence, mediaSequence, version, targetDurationUs, hasEndTag,
+        hasProgramDateTime, initializationSegment, segments);
   }
 
   /**
@@ -152,9 +168,9 @@ public final class HlsMediaPlaylist extends HlsPlaylist {
     if (this.hasEndTag) {
       return this;
     }
-    return new HlsMediaPlaylist(baseUri, startOffsetUs, startTimeUs, hasDiscontinuitySequence,
-        discontinuitySequence, mediaSequence, version, targetDurationUs, true, hasProgramDateTime,
-        initializationSegment, segments);
+    return new HlsMediaPlaylist(playlistType, baseUri, startOffsetUs, startTimeUs,
+        hasDiscontinuitySequence, discontinuitySequence, mediaSequence, version, targetDurationUs,
+        true, hasProgramDateTime, initializationSegment, segments);
   }
 
 }

library/src/main/java/com/google/android/exoplayer2/source/hls/playlist/HlsPlaylistParser.java

@@ -43,6 +43,7 @@ public final class HlsPlaylistParser implements ParsingLoadable.Parser<HlsPlayli
   private static final String PLAYLIST_HEADER = "#EXTM3U";
 
   private static final String TAG_VERSION = "#EXT-X-VERSION";
+  private static final String TAG_PLAYLIST_TYPE = "#EXT-X-PLAYLIST-TYPE";
   private static final String TAG_STREAM_INF = "#EXT-X-STREAM-INF";
   private static final String TAG_MEDIA = "#EXT-X-MEDIA";
   private static final String TAG_TARGET_DURATION = "#EXT-X-TARGETDURATION";
@@ -74,6 +75,8 @@ public final class HlsPlaylistParser implements ParsingLoadable.Parser<HlsPlayli
   private static final Pattern REGEX_TARGET_DURATION = Pattern.compile(TAG_TARGET_DURATION
       + ":(\\d+)\\b");
   private static final Pattern REGEX_VERSION = Pattern.compile(TAG_VERSION + ":(\\d+)\\b");
+  private static final Pattern REGEX_PLAYLIST_TYPE = Pattern.compile(TAG_PLAYLIST_TYPE
+      + ":(.+)\\b");
   private static final Pattern REGEX_MEDIA_SEQUENCE = Pattern.compile(TAG_MEDIA_SEQUENCE
       + ":(\\d+)\\b");
   private static final Pattern REGEX_MEDIA_DURATION = Pattern.compile(TAG_MEDIA_DURATION
@@ -245,6 +248,7 @@ public final class HlsPlaylistParser implements ParsingLoadable.Parser<HlsPlayli
 
   private static HlsMediaPlaylist parseMediaPlaylist(LineIterator iterator, String baseUri)
       throws IOException {
+    @HlsMediaPlaylist.PlaylistType int playlistType = HlsMediaPlaylist.PLAYLIST_TYPE_UNKNOWN;
     long startOffsetUs = C.TIME_UNSET;
     int mediaSequence = 0;
     int version = 1; // Default version == 1.
@@ -270,7 +274,16 @@ public final class HlsPlaylistParser implements ParsingLoadable.Parser<HlsPlayli
     String line;
     while (iterator.hasNext()) {
       line = iterator.next();
-      if (line.startsWith(TAG_START)) {
+      if (line.startsWith(TAG_PLAYLIST_TYPE)) {
+        String playlistTypeString = parseStringAttr(line, REGEX_PLAYLIST_TYPE);
+        if ("VOD".equals(playlistTypeString)) {
+          playlistType = HlsMediaPlaylist.PLAYLIST_TYPE_VOD;
+        } else if ("EVENT".equals(playlistTypeString)) {
+          playlistType = HlsMediaPlaylist.PLAYLIST_TYPE_EVENT;
+        } else {
+          throw new ParserException("Illegal playlist type: " + playlistTypeString);
+        }
+      } else if (line.startsWith(TAG_START)) {
         startOffsetUs = (long) (parseDoubleAttr(line, REGEX_TIME_OFFSET) * C.MICROS_PER_SECOND);
       } else if (line.startsWith(TAG_INIT_SEGMENT)) {
         String uri = parseStringAttr(line, REGEX_URI);
@@ -349,7 +362,7 @@ public final class HlsPlaylistParser implements ParsingLoadable.Parser<HlsPlayli
         hasEndTag = true;
       }
     }
-    return new HlsMediaPlaylist(baseUri, startOffsetUs, playlistStartTimeUs,
+    return new HlsMediaPlaylist(playlistType, baseUri, startOffsetUs, playlistStartTimeUs,
         hasDiscontinuitySequence, playlistDiscontinuitySequence, mediaSequence, version,
         targetDurationUs, hasEndTag, playlistStartTimeUs != 0, initializationSegment, segments);
   }

library/src/main/java/com/google/android/exoplayer2/source/hls/playlist/HlsPlaylistTracker.java

@@ -450,10 +450,11 @@ public final class HlsPlaylistTracker implements Loader.Callback<ParsingLoadable
       if (playlistSnapshot == null) {
         return false;
       }
-      // TODO: Return true for event playlists once playlist types are supported.
       long currentTimeMs = SystemClock.elapsedRealtime();
       long snapshotValidityDurationMs = Math.max(30000, C.usToMs(playlistSnapshot.durationUs));
       return playlistSnapshot.hasEndTag
+          || playlistSnapshot.playlistType == HlsMediaPlaylist.PLAYLIST_TYPE_EVENT
+          || playlistSnapshot.playlistType == HlsMediaPlaylist.PLAYLIST_TYPE_VOD
           || lastSnapshotLoadMs + snapshotValidityDurationMs > currentTimeMs;
     }