Motown: Improvements to packet definition

mojo/services/media/common/interfaces/media_transport.mojom

 // Copyright 2015 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.
 
 [DartPackage="mojo_services"]
 module mojo.media;
 
 import "mojo/services/media/common/interfaces/media_common.mojom";
 import "mojo/services/media/common/interfaces/media_types.mojom";
 
@@ skipping 12 matching lines @@
 // sent across a media pipe.  MediaPackets consist of the metadata for the unit
 // of media, as well as the set of offset/lengths in the pipe's shared buffer
 // which define the payload of the packet itself.
 struct MediaPacket {
   const int64 kNoTimestamp = 0x7fffffffffffffff;
 
   // Presentation Time Stamp.  Time at which the media should be presented,
   // according to the media timeline.
   int64 pts = kNoTimestamp;
 
-  // Duration represented by the packet.
-  uint64 duration;
-
   // Indicates whether this is the last packet in the stream.
   bool end_of_stream;
 
   // Bookkeeping to determine where this MediaPacket's payload exists in its
   // MediaPipe's shared buffer.
   //
   // For simple cases, only the payload field is used.  It provides the offset
   // into the shared buffer for the payload, as well as its length.  In more
   // complicated cases (circular buffer, arbitrary scatter-gather), additional
   // regions may be described in the extra_payload array.  Logically, the
@@ skipping 83 matching lines @@
   SendPacket(MediaPacket packet) => (SendResult result);
 
   // Primes the stream. The callback signals that the prime operation is
   // complete.
   Prime() => ();
 
   // Flushes the stream. The callback signals that the flush operation is
   // complete.
   Flush() => ();
 };