1 /*
2 * Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include "modules/audio_processing/typing_detection.h"
12
13 namespace webrtc {
14
TypingDetection()15 TypingDetection::TypingDetection()
16 : time_active_(0),
17 time_since_last_typing_(0),
18 penalty_counter_(0),
19 counter_since_last_detection_update_(0),
20 detection_to_report_(false),
21 new_detection_to_report_(false),
22 time_window_(10),
23 cost_per_typing_(100),
24 reporting_threshold_(300),
25 penalty_decay_(1),
26 type_event_delay_(2),
27 report_detection_update_period_(1) {
28 }
29
~TypingDetection()30 TypingDetection::~TypingDetection() {}
31
Process(bool key_pressed,bool vad_activity)32 bool TypingDetection::Process(bool key_pressed, bool vad_activity) {
33 if (vad_activity)
34 time_active_++;
35 else
36 time_active_ = 0;
37
38 // Keep track if time since last typing event
39 if (key_pressed)
40 time_since_last_typing_ = 0;
41 else
42 ++time_since_last_typing_;
43
44 if (time_since_last_typing_ < type_event_delay_ &&
45 vad_activity &&
46 time_active_ < time_window_) {
47 penalty_counter_ += cost_per_typing_;
48 if (penalty_counter_ > reporting_threshold_)
49 new_detection_to_report_ = true;
50 }
51
52 if (penalty_counter_ > 0)
53 penalty_counter_ -= penalty_decay_;
54
55 if (++counter_since_last_detection_update_ ==
56 report_detection_update_period_) {
57 detection_to_report_ = new_detection_to_report_;
58 new_detection_to_report_ = false;
59 counter_since_last_detection_update_ = 0;
60 }
61
62 return detection_to_report_;
63 }
64
TimeSinceLastDetectionInSeconds()65 int TypingDetection::TimeSinceLastDetectionInSeconds() {
66 // Round to whole seconds.
67 return (time_since_last_typing_ + 50) / 100;
68 }
69
SetParameters(int time_window,int cost_per_typing,int reporting_threshold,int penalty_decay,int type_event_delay,int report_detection_update_period)70 void TypingDetection::SetParameters(int time_window,
71 int cost_per_typing,
72 int reporting_threshold,
73 int penalty_decay,
74 int type_event_delay,
75 int report_detection_update_period) {
76 if (time_window) time_window_ = time_window;
77
78 if (cost_per_typing) cost_per_typing_ = cost_per_typing;
79
80 if (reporting_threshold) reporting_threshold_ = reporting_threshold;
81
82 if (penalty_decay) penalty_decay_ = penalty_decay;
83
84 if (type_event_delay) type_event_delay_ = type_event_delay;
85
86 if (report_detection_update_period)
87 report_detection_update_period_ = report_detection_update_period;
88 }
89
90 } // namespace webrtc
91