Support multiple media tracks in MSE / ChunkDemuxer

media/filters/frame_processor.cc

Index: media/filters/frame_processor.cc
diff --git a/media/filters/frame_processor.cc b/media/filters/frame_processor.cc
index 13dba12964dc789fb745a9d5db72dabfab8e9476..c6b1bc04d063854ba80fdd2c064dd819b1002cee 100644
--- a/media/filters/frame_processor.cc
+++ b/media/filters/frame_processor.cc
@@ -565,24 +565,7 @@ bool FrameProcessor::ProcessFrame(
 
     // 5. Let track buffer equal the track buffer that the coded frame will be
     //    added to.
-
-    // Remap audio and video track types to their special singleton identifiers.
-    StreamParser::TrackId track_id = kAudioTrackId;
-    switch (frame->type()) {
-      case DemuxerStream::AUDIO:
-        break;
-      case DemuxerStream::VIDEO:
-        track_id = kVideoTrackId;
-        break;
-      case DemuxerStream::TEXT:
-        track_id = frame->track_id();
-        break;
-      case DemuxerStream::UNKNOWN:
-      case DemuxerStream::NUM_TYPES:
-        DCHECK(false) << ": Invalid frame type " << frame->type();
-        return false;
-    }
-
+    StreamParser::TrackId track_id = frame->track_id();
     MseTrackBuffer* track_buffer = FindTrack(track_id);
     if (!track_buffer) {
       MEDIA_LOG(ERROR, media_log_)
@@ -591,6 +574,12 @@ bool FrameProcessor::ProcessFrame(
           << ", and parser track id " << frame->track_id();
       return false;
     }
+    if (frame->type() != track_buffer->stream()->type()) {
+      MEDIA_LOG(ERROR, media_log_) << "Frame type " << frame->GetTypeName()
+                                   << " doesn't match track buffer type "
+                                   << track_buffer->stream()->type();
+      return false;
+    }
 
     // 6. If last decode timestamp for track buffer is set and decode timestamp
     //    is less than last decode timestamp