MSE: Record counts of detected MSE audio, video and text tracks

media/formats/mpeg/mpeg_audio_stream_parser_base.cc

 // Copyright 2014 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/formats/mpeg/mpeg_audio_stream_parser_base.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/message_loop/message_loop.h"
 #include "media/base/media_tracks.h"
@@ skipping 208 matching lines @@
 
     scoped_ptr<MediaTracks> media_tracks(new MediaTracks());
     if (config_.IsValidConfig()) {
       media_tracks->AddAudioTrack(config_, "audio", "", "", "");
     }
     if (!config_cb_.Run(std::move(media_tracks), TextTrackConfigMap()))
       return -1;
 
     if (!init_cb_.is_null()) {
       InitParameters params(kInfiniteDuration());
+      params.detected_audio_track_count = 1;

[chcunningham, 2016/03/23 23:05:56]

Some quick googling for multitrack mpeg audio didn't turn up anything. I assume
you're good here :)

[wolenetz, 2016/03/25 23:25:08]

Acknowledged.

       params.auto_update_timestamp_offset = true;
       base::ResetAndReturn(&init_cb_).Run(params);
     }
   }
 
   if (metadata_frame)
     return frame_size;
 
   // TODO(wolenetz/acolwell): Validate and use a common cross-parser TrackId
   // type and allow multiple audio tracks, if applicable. See
@@ skipping 173 matching lines @@
   if (end_of_segment) {
     in_media_segment_ = false;
     end_of_segment_cb_.Run();
   }
 
   timestamp_helper_->SetBaseTimestamp(base::TimeDelta());
   return true;
 }
 
 }  // namespace media