Implement adaptive target delay extension

media/cast/net/rtp/rtp_defines.h

Index: media/cast/net/rtp/rtp_defines.h
diff --git a/media/cast/net/rtp/rtp_defines.h b/media/cast/net/rtp/rtp_defines.h
new file mode 100644
index 0000000000000000000000000000000000000000..56df66d4d21ce88f68e8579a6c66b6f874b65dd2
--- /dev/null
+++ b/media/cast/net/rtp/rtp_defines.h
@@ -0,0 +1,20 @@
+// 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.
+
+namespace media {
+namespace cast {
+
+static const uint16 kRtpHeaderLength = 12;
+static const uint16 kCastHeaderLength = 7;
+static const uint8 kRtpExtensionBitMask = 0x10;
+static const uint8 kCastKeyFrameBitMask = 0x80;
+static const uint8 kCastReferenceFrameIdBitMask = 0x40;
+static const uint8 kRtpMarkerBitMask = 0x80;
+static const uint8 kCastExtensionCountmask = 0x3f;
+
+// Cast RTP extensions.
+static const uint8 kCastRtpExtensionAdaptiveLatency = 1;
+
+}  // namespace cast
+}  // namespace media