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