Assign correct track ids to buffers emitted from StreamParsers

media/formats/mp2t/mp2t_common.h

 // 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.
 
 #ifndef MEDIA_FORMATS_MP2T_MP2T_COMMON_H_
 #define MEDIA_FORMATS_MP2T_MP2T_COMMON_H_
 
 #define LOG_LEVEL_TS  5
 #define LOG_LEVEL_PES 4
 #define LOG_LEVEL_ES  3
 
 #define RCHECK(x) \
     do { \
       if (!(x)) { \
         DLOG(WARNING) << "Failure while parsing Mpeg2TS: " << #x; \
         return false; \
       } \
     } while (0)
 
+namespace media {
+namespace mp2t {
+const int kMp2tAudioTrackId = 1;
+const int kMp2tVideoTrackId = 2;
+}  // namespace media
+}  // namespace mp2t
+
 #endif  // MEDIA_FORMATS_MP2T_MP2T_COMMON_H_