Implement mapping blink track id to demuxer streams

media/blink/websourcebuffer_impl.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/blink/websourcebuffer_impl.h"
 
 #include <stdint.h>
 
 #include <cmath>
 #include <limits>
@@ skipping 171 matching lines @@
   for (const auto& track : tracks->tracks()) {
     blink::WebSourceBufferClient::MediaTrackInfo trackInfo;
     trackInfo.trackType = mediaTrackTypeToBlink(track->type());
     trackInfo.byteStreamTrackId = blink::WebString::fromUTF8(track->id());
     trackInfo.kind = blink::WebString::fromUTF8(track->kind());
     trackInfo.label = blink::WebString::fromUTF8(track->label());
     trackInfo.language = blink::WebString::fromUTF8(track->language());
     trackInfoVector.push_back(trackInfo);
   }
 
-  client_->initializationSegmentReceived(trackInfoVector);
+  blink::WebVector<blink::WebMediaPlayer::TrackId> blinkTrackIds =
+      client_->initializationSegmentReceived(trackInfoVector);
+
+  std::vector<blink::WebMediaPlayer::TrackId> blinkTrackIdsVector;
+  for (const auto& id : blinkTrackIds)

[chcunningham, 2016/06/02 21:24:45]

Surprised there isn't a util function for this (or a method off WebVector to
just get the underlying vector)? I can't find one though... 

[servolk, 2016/06/02 23:53:11]

Yep, I didn't find anything like that either.

+    blinkTrackIdsVector.push_back(id);
+
+  demuxer_->OnTrackIdsAssigned(*tracks.get(), blinkTrackIdsVector);
 }
 
 }  // namespace media