Expand check for muxed audio media tags to include uris that match variants

Issue:#5313
PiperOrigin-RevId: 228155222

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

@@ -360,7 +360,7 @@ public final class HlsPlaylistParser implements ParsingLoadable.Parser<HlsPlayli
                   /* initializationData= */ null,
                   selectionFlags,
                   language);
-          if (uri == null) {
+          if (isMediaTagMuxed(variants, uri)) {
             muxedAudioFormat = format;
           } else {
             audios.add(new HlsMasterPlaylist.HlsUrl(uri, format));
@@ -766,6 +766,20 @@ public final class HlsPlaylistParser implements ParsingLoadable.Parser<HlsPlayli
     return Pattern.compile(attribute + "=(" + BOOLEAN_FALSE + "|" + BOOLEAN_TRUE + ")");
   }
 
+  private static boolean isMediaTagMuxed(
+      List<HlsMasterPlaylist.HlsUrl> variants, String mediaTagUri) {
+    if (mediaTagUri == null) {
+      return true;
+    }
+    // The URI attribute is defined, but it may match the uri of a variant.
+    for (int i = 0; i < variants.size(); i++) {
+      if (mediaTagUri.equals(variants.get(i).url)) {
+        return true;
+      }
+    }
+    return false;
+  }
+
   private static class LineIterator {
 
     private final BufferedReader reader;

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

@@ -134,6 +134,17 @@ public class HlsMasterPlaylistParserTest {
           + "#EXT-X-STREAM-INF:BANDWIDTH=65000,CODECS=\"{$codecs}\"\n"
           + "http://example.com/{$tricky}\n";
 
+  private static final String PLAYLIST_WITH_MULTIPLE_MUXED_MEDIA_TAGS =
+      "#EXTM3U\n"
+          + "#EXT-X-VERSION:3\n"
+          + "#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID=\"a\",NAME=\"audio_0\",DEFAULT=YES,URI=\"0/0.m3u8\"\n"
+          + "#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID=\"b\",NAME=\"audio_0\",DEFAULT=YES,URI=\"1/1.m3u8\"\n"
+          + "#EXT-X-STREAM-INF:BANDWIDTH=140800,CODECS=\"mp4a.40.2\",AUDIO=\"a\"\n"
+          + "0/0.m3u8\n"
+          + "\n"
+          + "#EXT-X-STREAM-INF:BANDWIDTH=281600,CODECS=\"mp4a.40.2\",AUDIO=\"b\"\n"
+          + "1/1.m3u8\n";
+
   @Test
   public void testParseMasterPlaylist() throws IOException {
     HlsMasterPlaylist masterPlaylist = parseMasterPlaylist(PLAYLIST_URI, PLAYLIST_SIMPLE);
@@ -271,6 +282,14 @@ public class HlsMasterPlaylistParserTest {
     assertThat(variant.url).isEqualTo("http://example.com/This/{$nested}/reference/shouldnt/work");
   }
 
+  @Test
+  public void testMultipleMuxedMediaTags() throws IOException {
+    HlsMasterPlaylist playlistWithMultipleMuxedMediaTags =
+        parseMasterPlaylist(PLAYLIST_URI, PLAYLIST_WITH_MULTIPLE_MUXED_MEDIA_TAGS);
+    assertThat(playlistWithMultipleMuxedMediaTags.variants).hasSize(2);
+    assertThat(playlistWithMultipleMuxedMediaTags.audios).isEmpty();
+  }
+
   private static HlsMasterPlaylist parseMasterPlaylist(String uri, String playlistString)
       throws IOException {
     Uri playlistUri = Uri.parse(uri);