HlsPlaylistParser: ignore subtitles without URI

Issue: #8323
PiperOrigin-RevId: 347827615

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

@@ -34,6 +34,7 @@ import com.google.android.exoplayer2.source.hls.playlist.HlsMasterPlaylist.Varia
 import com.google.android.exoplayer2.source.hls.playlist.HlsMediaPlaylist.Segment;
 import com.google.android.exoplayer2.upstream.ParsingLoadable;
 import com.google.android.exoplayer2.util.Assertions;
+import com.google.android.exoplayer2.util.Log;
 import com.google.android.exoplayer2.util.MimeTypes;
 import com.google.android.exoplayer2.util.UriUtil;
 import com.google.android.exoplayer2.util.Util;
@@ -61,6 +62,8 @@ import org.checkerframework.checker.nullness.qual.PolyNull;
  */
 public final class HlsPlaylistParser implements ParsingLoadable.Parser<HlsPlaylist> {
 
+  private static final String LOG_TAG = "HlsPlaylistParser";
+
   private static final String PLAYLIST_HEADER = "#EXTM3U";
 
   private static final String TAG_PREFIX = "#EXT";
@@ -480,7 +483,11 @@ public final class HlsPlaylistParser implements ParsingLoadable.Parser<HlsPlayli
             sampleMimeType = MimeTypes.TEXT_VTT;
           }
           formatBuilder.setSampleMimeType(sampleMimeType).setMetadata(metadata);
-          subtitles.add(new Rendition(uri, formatBuilder.build(), groupId, name));
+          if (uri != null) {
+            subtitles.add(new Rendition(uri, formatBuilder.build(), groupId, name));
+          } else {
+            Log.w(LOG_TAG, "EXT-X-MEDIA tag with missing mandatory URI attribute: skipping");
+          }
           break;
         case TYPE_CLOSED_CAPTIONS:
           String instreamId = parseStringAttr(line, REGEX_INSTREAM_ID, variableDefinitions);

library/hls/src/test/java/com/google/android/exoplayer2/source/hls/playlist/HlsMasterPlaylistParserTest.java

@@ -109,6 +109,14 @@ public class HlsMasterPlaylistParserTest {
 
   private static final String PLAYLIST_WITH_SUBTITLES =
       " #EXTM3U \n"
+          + "#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID=\"sub1\",URI=\"s1/en/prog_index.m3u8\","
+          + "LANGUAGE=\"es\",NAME=\"Eng\"\n"
+          + "#EXT-X-STREAM-INF:BANDWIDTH=1280000,"
+          + "CODECS=\"mp4a.40.2,avc1.66.30\",RESOLUTION=304x128\n"
+          + "http://example.com/low.m3u8\n";
+
+  private static final String PLAYLIST_WITH_SUBTITLES_NO_URI =
+      " #EXTM3U \n"
           + "#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID=\"sub1\","
           + "LANGUAGE=\"es\",NAME=\"Eng\"\n"
           + "#EXT-X-STREAM-INF:BANDWIDTH=1280000,"
@@ -355,6 +363,13 @@ public class HlsMasterPlaylistParserTest {
   }
 
   @Test
+  public void parseMasterPlaylist_subtitlesWithoutUri_skipsSubtitles() throws IOException {
+    HlsMasterPlaylist playlist = parseMasterPlaylist(PLAYLIST_URI, PLAYLIST_WITH_SUBTITLES_NO_URI);
+
+    assertThat(playlist.subtitles).isEmpty();
+  }
+
+  @Test
   public void parseMasterPlaylist_withIndependentSegments_hasNoIndenpendentSegments()
       throws IOException {
     HlsMasterPlaylist playlistWithIndependentSegments =