Cast: move net->transport

media/cast/net/cast_net_defines.h

-// Copyright 2013 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 MEDIA_CAST_NET_CAST_NET_DEFINES_H_
-#define MEDIA_CAST_NET_CAST_NET_DEFINES_H_
-
-#include "base/basictypes.h"
-
-namespace media {
-namespace cast {
-
-class FrameIdWrapHelper {
- public:
-  FrameIdWrapHelper()
-      : first_(true),
-        frame_id_wrap_count_(0),
-        range_(kLowRange) {}
-
-  uint32 MapTo32bitsFrameId(const uint8 over_the_wire_frame_id) {
-    if (first_) {
-      first_ = false;
-      if (over_the_wire_frame_id == 0xff) {
-        // Special case for startup.
-        return kStartFrameId;
-      }
-    }
-
-    uint32 wrap_count = frame_id_wrap_count_;
-    switch (range_) {
-      case kLowRange:
-        if (over_the_wire_frame_id > kLowRangeThreshold &&
-            over_the_wire_frame_id < kHighRangeThreshold) {
-          range_ = kMiddleRange;
-        }
-        if (over_the_wire_frame_id > kHighRangeThreshold) {
-          // Wrap count was incremented in High->Low transition, but this frame
-          // is 'old', actually from before the wrap count got incremented.
-          --wrap_count;
-        }
-        break;
-      case kMiddleRange:
-        if (over_the_wire_frame_id > kHighRangeThreshold) {
-          range_ = kHighRange;
-        }
-        break;
-      case kHighRange:
-        if (over_the_wire_frame_id < kLowRangeThreshold) {
-          // Wrap-around detected.
-          range_ = kLowRange;
-          ++frame_id_wrap_count_;
-          // Frame triggering wrap-around so wrap count should be incremented as
-          // as well to match |frame_id_wrap_count_|.
-          ++wrap_count;
-        }
-        break;
-    }
-    return (wrap_count << 8) + over_the_wire_frame_id;
-  }
-
- private:
-  enum Range {
-    kLowRange,
-    kMiddleRange,
-    kHighRange,
-  };
-
-  static const uint8 kLowRangeThreshold = 0x0f;
-  static const uint8 kHighRangeThreshold = 0xf0;
-  static const uint32 kStartFrameId = GG_UINT32_C(0xffffffff);
-
-  bool first_;
-  uint32 frame_id_wrap_count_;
-  Range range_;
-};
-
-
-}  // namespace cast
-}  // namespace media
-
-#endif  // MEDIA_CAST_NET_CAST_NET_DEFINES_H_