IPC to pass media data using a lock free circular fifo.

chromecast/media/cma/ipc/media_message_type.h

Index: chromecast/media/cma/ipc/media_message_type.h
diff --git a/chromecast/media/cma/ipc/media_message_type.h b/chromecast/media/cma/ipc/media_message_type.h
new file mode 100644
index 0000000000000000000000000000000000000000..23ff8474d323af0e29a5b1d7a6d6579da6824031
--- /dev/null
+++ b/chromecast/media/cma/ipc/media_message_type.h
@@ -0,0 +1,15 @@
+// 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 CHROMECAST_MEDIA_CMA_IPC_MEDIA_MESSAGE_TYPE_H_
+#define CHROMECAST_MEDIA_CMA_IPC_MEDIA_MESSAGE_TYPE_H_
+
+enum MediaMessageType {
+  PaddingMediaMsg = 1,
+  FrameMediaMsg,
+  AudioConfigMediaMsg,
+  VideoConfigMediaMsg,
+};
+
+#endif