media: scaffolding and plumbing for MojoRenderer{Impl, Service}

media/mojo/interfaces/media_renderer.mojom

 // 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.
 
+import "media/mojo/interfaces/demuxer_stream.mojom"
 import "media/mojo/interfaces/media_types.mojom"
 
 module mojo {
 
 [Client=MediaRendererClient]
 interface MediaRenderer {
-  // Initializes the Renderer, calling back upon completion.
+  // Initializes the Renderer with |stream|, calling back upon completion.
   // NOTE: If an error occurs, MediaRendererClient::OnError() will be called
   // before the callback is executed.
-  Initialize() => ();
-
-  // Decodes and renders |buffer|, calling back when more data is required.
-  // NOTE: If an error occurs, MediaRendererClient::OnError() will be called
-  // before the callback is executed.
-  // TODO(tim): Switch decoding model to use framed data pipe when available.
-  // In that world, the signalling for more would be implicit by a writable
-  // pipe handle on the client side so this entire method + callback goes away.
-  DecodeAndRender(MediaDecoderBuffer buffer) => ();
+  Initialize(DemuxerStream stream) => ();

[scherkus (not reviewing), 2014/09/09 20:35:32]

FYI this will likely change in response to
https://codereview.chromium.org/523283002/

[tim (not reviewing), 2014/09/10 23:08:28]

OK... I'll loop back to this once I address the bulk of the comments.

 
   // Discards any buffered data, executing callback when completed.
   // NOTE: If an error occurs, MediaRendererClient::OnError() can be called
   // before the callback is executed.
   Flush() => ();
 
   // Starts rendering from |time_usec|.
   StartPlayingFrom(int64 time_usec);
 
   // Updates the current playback rate. The default playback rate should be 1.
@@ skipping 18 matching lines @@
   // Executed when rendering has reached the end of stream.
   OnEnded();
 
   // Executed if any error was encountered during decode or rendering. If
   // this error happens during an operation that has a completion callback,
   // OnError() will be called before firing the completion callback.
   OnError();
 };
 
 }  // module mojo