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385b10bbaa
The field trial effects two things: after a frame length change the IAT histogram is scaled to prevent an immediate change in target buffer level. Also, the peak history in the delay peak detector is cleared, because the size of the peaks is stored in number of packets (which will be incorrect after a frame length change). Bug: webrtc:8381 Change-Id: I214b990f6e5959b655b6542884a7f75da181a0d8 Reviewed-on: https://webrtc-review.googlesource.com/8101 Reviewed-by: Henrik Lundin <henrik.lundin@webrtc.org> Commit-Queue: Ivo Creusen <ivoc@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20284}
75 lines
2.4 KiB
C++
75 lines
2.4 KiB
C++
/*
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* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_AUDIO_CODING_NETEQ_DELAY_PEAK_DETECTOR_H_
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#define MODULES_AUDIO_CODING_NETEQ_DELAY_PEAK_DETECTOR_H_
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#include <string.h> // size_t
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#include <list>
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#include <memory>
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#include "modules/audio_coding/neteq/tick_timer.h"
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#include "rtc_base/constructormagic.h"
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namespace webrtc {
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class DelayPeakDetector {
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public:
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DelayPeakDetector(const TickTimer* tick_timer);
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virtual ~DelayPeakDetector();
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virtual void Reset();
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// Notifies the DelayPeakDetector of how much audio data is carried in each
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// packet.
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virtual void SetPacketAudioLength(int length_ms);
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// Returns true if peak-mode is active. That is, delay peaks were observed
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// recently.
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virtual bool peak_found();
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// Calculates and returns the maximum delay peak height. Returns -1 if no
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// delay peaks have been observed recently. The unit is number of packets.
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virtual int MaxPeakHeight() const;
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// Calculates and returns the maximum delay peak distance in ms (strictly
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// larger than 0), or 0 if no delay peaks have been observed recently.
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virtual uint64_t MaxPeakPeriod() const;
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// Updates the DelayPeakDetector with a new inter-arrival time (in packets)
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// and the current target buffer level (needed to decide if a peak is observed
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// or not). Returns true if peak-mode is active, false if not.
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virtual bool Update(int inter_arrival_time, int target_level);
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private:
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static const size_t kMaxNumPeaks = 8;
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static const size_t kMinPeaksToTrigger = 2;
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static const int kPeakHeightMs = 78;
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static const int kMaxPeakPeriodMs = 10000;
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typedef struct {
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uint64_t period_ms;
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int peak_height_packets;
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} Peak;
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bool CheckPeakConditions();
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std::list<Peak> peak_history_;
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bool peak_found_;
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int peak_detection_threshold_;
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const TickTimer* tick_timer_;
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std::unique_ptr<TickTimer::Stopwatch> peak_period_stopwatch_;
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const bool frame_length_change_experiment_;
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RTC_DISALLOW_COPY_AND_ASSIGN(DelayPeakDetector);
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_CODING_NETEQ_DELAY_PEAK_DETECTOR_H_
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