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/*
* Copyright (c) 2014 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.
*/
#include "modules/audio_processing/typing_detection.h"
namespace webrtc {
TypingDetection::TypingDetection()
: time_active_(0),
time_since_last_typing_(0),
penalty_counter_(0),
counter_since_last_detection_update_(0),
detection_to_report_(false),
new_detection_to_report_(false),
time_window_(10),
cost_per_typing_(100),
reporting_threshold_(300),
penalty_decay_(1),
type_event_delay_(2),
report_detection_update_period_(1) {}
TypingDetection::~TypingDetection() {}
bool TypingDetection::Process(bool key_pressed, bool vad_activity) {
if (vad_activity)
time_active_++;
else
time_active_ = 0;
// Keep track if time since last typing event
if (key_pressed)
time_since_last_typing_ = 0;
else
++time_since_last_typing_;
if (time_since_last_typing_ < type_event_delay_ && vad_activity &&
time_active_ < time_window_) {
penalty_counter_ += cost_per_typing_;
if (penalty_counter_ > reporting_threshold_)
new_detection_to_report_ = true;
}
if (penalty_counter_ > 0)
penalty_counter_ -= penalty_decay_;
if (++counter_since_last_detection_update_ ==
report_detection_update_period_) {
detection_to_report_ = new_detection_to_report_;
new_detection_to_report_ = false;
counter_since_last_detection_update_ = 0;
}
return detection_to_report_;
}
int TypingDetection::TimeSinceLastDetectionInSeconds() {
// Round to whole seconds.
return (time_since_last_typing_ + 50) / 100;
}
void TypingDetection::SetParameters(int time_window,
int cost_per_typing,
int reporting_threshold,
int penalty_decay,
int type_event_delay,
int report_detection_update_period) {
if (time_window)
time_window_ = time_window;
if (cost_per_typing)
cost_per_typing_ = cost_per_typing;
if (reporting_threshold)
reporting_threshold_ = reporting_threshold;
if (penalty_decay)
penalty_decay_ = penalty_decay;
if (type_event_delay)
type_event_delay_ = type_event_delay;
if (report_detection_update_period)
report_detection_update_period_ = report_detection_update_period;
}
} // namespace webrtc
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