Motown: Framework parts for mojo transport (producer/consumer/mediapipe) and control (audiotrack).

mojo/services/media/control/interfaces/media_source.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_clock.mojom";
 import "mojo/services/media/common/interfaces/media_common.mojom";
 import "mojo/services/media/common/interfaces/media_metadata.mojom";
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   // Gets the pull mode producer for the specified stream.
   GetPullModeProducer(uint32 stream_index, MediaPullModeProducer& producer);
 
   // Gets the status. To get the status immediately, call GetStatus(0). To
   // get updates thereafter, pass the version sent in the previous callback.
   GetStatus(uint64 version_last_seen) =>
       (uint64 version, MediaSourceStatus status);
 
   // Prepares the source.
-  // TODO(dalesat): Revisit.
   Prepare() => ();
+
+  // Flushes the source.
+  Flush() => ();
 };
 
 // Describes a media stream produced by a source.
 struct MediaSourceStreamDescriptor {
   // Zero-based index.
   uint32 index;
 
   // Media type of the stream after conversion.
   MediaType media_type;
 
   // Media type of the stream before conversion (as produced by the demux).
   MediaType original_media_type;
 };
 
 // Describes the media source.
 struct MediaSourceStatus {
   // Current state of the source.
   MediaState state;
 
   // Describes the media.
   MediaMetadata? metadata;
 };