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/*
* 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_NETEQ4_DELAY_PEAK_DETECTOR_H_
#define WEBRTC_MODULES_AUDIO_CODING_NETEQ4_DELAY_PEAK_DETECTOR_H_
#include <string.h> // size_t
#include <list>
#include "webrtc/base/constructormagic.h"
namespace webrtc {
class DelayPeakDetector {
public:
DelayPeakDetector();
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() { return 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.
// Returns -1 if no delay peaks have been observed recently.
virtual int 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);
// Increments the |peak_period_counter_ms_| with |inc_ms|. Only increments
// the counter if it is non-negative. A negative denotes that no peak has
// been observed.
virtual void IncrementCounter(int inc_ms);
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 {
int period_ms;
int peak_height_packets;
} Peak;
bool CheckPeakConditions();
std::list<Peak> peak_history_;
bool peak_found_;
int peak_detection_threshold_;
int peak_period_counter_ms_;
DISALLOW_COPY_AND_ASSIGN(DelayPeakDetector);
};
} // namespace webrtc
#endif // WEBRTC_MODULES_AUDIO_CODING_NETEQ4_DELAY_PEAK_DETECTOR_H_
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