Create unique id for hls audio and text tracks

Combine groupId and name for uniqueness

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

@@ -341,6 +341,7 @@ public final class HlsPlaylistParser implements ParsingLoadable.Parser<HlsPlayli
       String name = parseStringAttr(line, REGEX_NAME, variableDefinitions);
       String language = parseOptionalStringAttr(line, REGEX_LANGUAGE, variableDefinitions);
       String groupId = parseOptionalStringAttr(line, REGEX_GROUP_ID, variableDefinitions);
+      String id = String.format("%s:%s", groupId, name);
       Format format;
       switch (parseStringAttr(line, REGEX_TYPE, variableDefinitions)) {
         case TYPE_AUDIO:
@@ -348,7 +349,7 @@ public final class HlsPlaylistParser implements ParsingLoadable.Parser<HlsPlayli
           String sampleMimeType = codecs != null ? MimeTypes.getMediaMimeType(codecs) : null;
           format =
               Format.createAudioContainerFormat(
-                  /* id= */ name,
+                  /* id= */ id,
                   /* label= */ name,
                   /* containerMimeType= */ MimeTypes.APPLICATION_M3U8,
                   sampleMimeType,
@@ -368,7 +369,7 @@ public final class HlsPlaylistParser implements ParsingLoadable.Parser<HlsPlayli
         case TYPE_SUBTITLES:
           format =
               Format.createTextContainerFormat(
-                  /* id= */ name,
+                  /* id= */ id,
                   /* label= */ name,
                   /* containerMimeType= */ MimeTypes.APPLICATION_M3U8,
                   /* sampleMimeType= */ MimeTypes.TEXT_VTT,
@@ -394,7 +395,7 @@ public final class HlsPlaylistParser implements ParsingLoadable.Parser<HlsPlayli
           }
           muxedCaptionFormats.add(
               Format.createTextContainerFormat(
-                  /* id= */ name,
+                  /* id= */ id,
                   /* label= */ name,
                   /* containerMimeType= */ null,
                   /* sampleMimeType= */ mimeType,

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

@@ -75,7 +75,7 @@ public class HlsMasterPlaylistParserTest {
 
   private static final String PLAYLIST_WITH_CC =
       " #EXTM3U \n"
-          + "#EXT-X-MEDIA:TYPE=CLOSED-CAPTIONS,"
+          + "#EXT-X-MEDIA:TYPE=CLOSED-CAPTIONS,GROUP-ID=\"cc1\","
           + "LANGUAGE=\"es\",NAME=\"Eng\",INSTREAM-ID=\"SERVICE4\"\n"
           + "#EXT-X-STREAM-INF:BANDWIDTH=1280000,"
           + "CODECS=\"mp4a.40.2,avc1.66.30\",RESOLUTION=304x128\n"
@@ -90,6 +90,14 @@ public class HlsMasterPlaylistParserTest {
           + "CLOSED-CAPTIONS=NONE\n"
           + "http://example.com/low.m3u8\n";
 
+  private static final String PLAYLIST_WITH_SUBTITLES =
+      " #EXTM3U \n"
+          + "#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID=\"sub1\","
+          + "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_AUDIO_MEDIA_TAG =
       "#EXTM3U\n"
           + "#EXT-X-STREAM-INF:BANDWIDTH=2227464,CODECS=\"avc1.640020,mp4a.40.2\",AUDIO=\"aud1\"\n"
@@ -217,6 +225,33 @@ public class HlsMasterPlaylistParserTest {
   }
 
   @Test
+  public void testAudioIdPropagation() throws IOException {
+    HlsMasterPlaylist playlist = parseMasterPlaylist(PLAYLIST_URI, PLAYLIST_WITH_AUDIO_MEDIA_TAG);
+
+    Format firstAudioFormat = playlist.audios.get(0).format;
+    assertThat(firstAudioFormat.id).isEqualTo("aud1:English");
+
+    Format secondAudioFormat = playlist.audios.get(1).format;
+    assertThat(secondAudioFormat.id).isEqualTo("aud2:English");
+  }
+
+  @Test
+  public void testCCIdPropagation() throws IOException {
+    HlsMasterPlaylist playlist = parseMasterPlaylist(PLAYLIST_URI, PLAYLIST_WITH_CC);
+
+    Format firstTextFormat = playlist.muxedCaptionFormats.get(0);
+    assertThat(firstTextFormat.id).isEqualTo("cc1:Eng");
+  }
+
+  @Test
+  public void testSubtitleIdPropagation() throws IOException {
+    HlsMasterPlaylist playlist = parseMasterPlaylist(PLAYLIST_URI, PLAYLIST_WITH_SUBTITLES);
+
+    Format firstTextFormat = playlist.subtitles.get(0).format;
+    assertThat(firstTextFormat.id).isEqualTo("sub1:Eng");
+  }
+
+  @Test
   public void testIndependentSegments() throws IOException {
     HlsMasterPlaylist playlistWithIndependentSegments =
         parseMasterPlaylist(PLAYLIST_URI, PLAYLIST_WITH_INDEPENDENT_SEGMENTS);