Add MediaParser-based implementation of ChunkExtractor

PiperOrigin-RevId: 315720712

library/common/src/main/java/com/google/android/exoplayer2/util/MimeTypes.java

@@ -529,6 +529,16 @@ public final class MimeTypes {
     }
   }
 
+  /** Returns whether the given {@code mimeType} is a WebM MIME type. */
+  public static boolean isWebm(@Nullable String mimeType) {
+    if (mimeType == null) {
+      return false;
+    }
+    return mimeType.startsWith(MimeTypes.VIDEO_WEBM)
+        || mimeType.startsWith(MimeTypes.AUDIO_WEBM)
+        || mimeType.startsWith(MimeTypes.APPLICATION_WEBM);
+  }
+
   /**
    * Returns the top-level type of {@code mimeType}, or null if {@code mimeType} is null or does not
    * contain a forward slash character ({@code '/'}).

library/dash/src/main/java/com/google/android/exoplayer2/source/dash/DefaultDashChunkSource.java

@@ -771,11 +771,6 @@ public class DefaultDashChunkSource implements DashChunkSource {
       return getFirstSegmentNum() + availableSegmentCount - 1;
     }
 
-    private static boolean mimeTypeIsWebm(String mimeType) {
-      return mimeType.startsWith(MimeTypes.VIDEO_WEBM) || mimeType.startsWith(MimeTypes.AUDIO_WEBM)
-          || mimeType.startsWith(MimeTypes.APPLICATION_WEBM);
-    }
-
     @Nullable
     private static ChunkExtractor createChunkExtractor(
         int trackType,
@@ -784,6 +779,7 @@ public class DefaultDashChunkSource implements DashChunkSource {
         List<Format> closedCaptionFormats,
         @Nullable TrackOutput playerEmsgTrackOutput) {
       String containerMimeType = representation.format.containerMimeType;
+
       Extractor extractor;
       if (MimeTypes.isText(containerMimeType)) {
         if (MimeTypes.APPLICATION_RAWCC.equals(containerMimeType)) {
@@ -793,7 +789,7 @@ public class DefaultDashChunkSource implements DashChunkSource {
           // All other text types are raw formats that do not need an extractor.
           return null;
         }
-      } else if (mimeTypeIsWebm(containerMimeType)) {
+      } else if (MimeTypes.isWebm(containerMimeType)) {
         extractor = new MatroskaExtractor(MatroskaExtractor.FLAG_DISABLE_SEEK_FOR_CUES);
       } else {
         int flags = 0;