Cast:Moving netwrok sender related code to a designated folder

media/cast/cast_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_CAST_DEFINES_H_
 #define MEDIA_CAST_CAST_DEFINES_H_
 
 #include <map>
 #include <set>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/time/time.h"
 
 namespace media {
 namespace cast {
 
 const int64 kDontShowTimeoutMs = 33;
 const float kDefaultCongestionControlBackOff = 0.875f;
-const uint32 kStartFrameId = GG_UINT32_C(0xffffffff);
 const uint32 kVideoFrequency = 90000;
 const int64 kSkippedFramesCheckPeriodkMs = 10000;
+const uint32 kStartFrameId = GG_UINT32_C(0xffffffff);
 
 // Number of skipped frames threshold in fps (as configured) per period above.
 const int kSkippedFramesThreshold = 3;
 const size_t kIpPacketSize = 1500;
 const int kStartRttMs = 20;
 const int64 kCastMessageUpdateIntervalMs = 33;
 const int64 kNackRepeatIntervalMs = 30;
 
 enum DefaultSettings {
   kDefaultAudioEncoderBitrate = 0,  // This means "auto," and may mean VBR.
@@ skipping 99 matching lines @@
   int64 ntp_time_us = static_cast<int64>(ntp_seconds) *
       base::Time::kMicrosecondsPerSecond +
           static_cast<int64>(ntp_fractions) / kMagicFractionalUnit;
 
   base::TimeDelta elapsed_since_unix_epoch =
       base::TimeDelta::FromMicroseconds(ntp_time_us -
           (kUnixEpochInNtpSeconds * base::Time::kMicrosecondsPerSecond));
   return base::TimeTicks::UnixEpoch() + elapsed_since_unix_epoch;
 }
 
-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;
-
-  bool first_;
-  uint32 frame_id_wrap_count_;
-  Range range_;
-};
-
 inline std::string GetAesNonce(uint32 frame_id, const std::string& iv_mask) {
   std::string aes_nonce(kAesBlockSize, 0);
 
   // Serializing frame_id in big-endian order (aes_nonce[8] is the most
   // significant byte of frame_id).
   aes_nonce[11] = frame_id & 0xff;
   aes_nonce[10] = (frame_id >> 8) & 0xff;
   aes_nonce[9] = (frame_id >> 16) & 0xff;
   aes_nonce[8] = (frame_id >> 24) & 0xff;
 
   for (size_t i = 0; i < kAesBlockSize; ++i) {
     aes_nonce[i] ^= iv_mask[i];
   }
   return aes_nonce;
 }
 
 inline uint32 GetVideoRtpTimestamp(const base::TimeTicks& time_ticks) {
   base::TimeTicks zero_time;
   base::TimeDelta recorded_delta = time_ticks - zero_time;
   // Timestamp is in 90 KHz for video.
   return static_cast<uint32>(recorded_delta.InMilliseconds() * 90);
 }
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_CAST_DEFINES_H_