Moving src/webrtc into src/.

In order to eliminate the WebRTC Subtree mirror in Chromium, 
WebRTC is moving the content of the src/webrtc directory up
to the src/ directory.

NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
TBR=tommi@webrtc.org

Bug: chromium:611808
Change-Id: Iac59c5b51b950f174119565bac87955a7994bc38
Reviewed-on: https://webrtc-review.googlesource.com/1560
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Henrik Kjellander <kjellander@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#19845}

modules/audio_coding/neteq/delay_peak_detector.h

@@ -0,0 +1,74 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_MODULES_AUDIO_CODING_NETEQ_DELAY_PEAK_DETECTOR_H_
+#define WEBRTC_MODULES_AUDIO_CODING_NETEQ_DELAY_PEAK_DETECTOR_H_
+
+#include <string.h>  // size_t
+
+#include <list>
+#include <memory>
+
+#include "webrtc/modules/audio_coding/neteq/tick_timer.h"
+#include "webrtc/rtc_base/constructormagic.h"
+
+namespace webrtc {
+
+class DelayPeakDetector {
+ public:
+  DelayPeakDetector(const TickTimer* tick_timer);
+  virtual ~DelayPeakDetector();
+  virtual void Reset();
+
+  // Notifies the DelayPeakDetector of how much audio data is carried in each
+  // packet.
+  virtual void SetPacketAudioLength(int length_ms);
+
+  // Returns true if peak-mode is active. That is, delay peaks were observed
+  // recently.
+  virtual bool peak_found();
+
+  // Calculates and returns the maximum delay peak height. Returns -1 if no
+  // delay peaks have been observed recently. The unit is number of packets.
+  virtual int MaxPeakHeight() const;
+
+  // Calculates and returns the maximum delay peak distance in ms (strictly
+  // larger than 0), or 0 if no delay peaks have been observed recently.
+  virtual uint64_t MaxPeakPeriod() const;
+
+  // Updates the DelayPeakDetector with a new inter-arrival time (in packets)
+  // and the current target buffer level (needed to decide if a peak is observed
+  // or not). Returns true if peak-mode is active, false if not.
+  virtual bool Update(int inter_arrival_time, int target_level);
+
+ private:
+  static const size_t kMaxNumPeaks = 8;
+  static const size_t kMinPeaksToTrigger = 2;
+  static const int kPeakHeightMs = 78;
+  static const int kMaxPeakPeriodMs = 10000;
+
+  typedef struct {
+    uint64_t period_ms;
+    int peak_height_packets;
+  } Peak;
+
+  bool CheckPeakConditions();
+
+  std::list<Peak> peak_history_;
+  bool peak_found_;
+  int peak_detection_threshold_;
+  const TickTimer* tick_timer_;
+  std::unique_ptr<TickTimer::Stopwatch> peak_period_stopwatch_;
+
+  RTC_DISALLOW_COPY_AND_ASSIGN(DelayPeakDetector);
+};
+
+}  // namespace webrtc
+#endif  // WEBRTC_MODULES_AUDIO_CODING_NETEQ_DELAY_PEAK_DETECTOR_H_