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
~TypingDetection()29 TypingDetection::~TypingDetection() {}
30
Process(bool key_pressed,bool vad_activity)31 bool TypingDetection::Process(bool key_pressed, bool vad_activity) {
32 if (vad_activity)
33 time_active_++;
34 else
35 time_active_ = 0;
36
37 // Keep track if time since last typing event
38 if (key_pressed)
39 time_since_last_typing_ = 0;
40 else
41 ++time_since_last_typing_;
42
43 if (time_since_last_typing_ < type_event_delay_ && vad_activity &&
44 time_active_ < time_window_) {
45 penalty_counter_ += cost_per_typing_;
46 if (penalty_counter_ > reporting_threshold_)
47 new_detection_to_report_ = true;
48 }
49
50 if (penalty_counter_ > 0)
51 penalty_counter_ -= penalty_decay_;
52
53 if (++counter_since_last_detection_update_ ==
54 report_detection_update_period_) {
55 detection_to_report_ = new_detection_to_report_;
56 new_detection_to_report_ = false;
57 counter_since_last_detection_update_ = 0;
58 }
59
60 return detection_to_report_;
61 }
62
TimeSinceLastDetectionInSeconds()63 int TypingDetection::TimeSinceLastDetectionInSeconds() {
64 // Round to whole seconds.
65 return (time_since_last_typing_ + 50) / 100;
66 }
67
SetParameters(int time_window,int cost_per_typing,int reporting_threshold,int penalty_decay,int type_event_delay,int report_detection_update_period)68 void TypingDetection::SetParameters(int time_window,
69 int cost_per_typing,
70 int reporting_threshold,
71 int penalty_decay,
72 int type_event_delay,
73 int report_detection_update_period) {
74 if (time_window)
75 time_window_ = time_window;
76
77 if (cost_per_typing)
78 cost_per_typing_ = cost_per_typing;
79
80 if (reporting_threshold)
81 reporting_threshold_ = reporting_threshold;
82
83 if (penalty_decay)
84 penalty_decay_ = penalty_decay;
85
86 if (type_event_delay)
87 type_event_delay_ = type_event_delay;
88
89 if (report_detection_update_period)
90 report_detection_update_period_ = report_detection_update_period;
91 }
92
93 } // namespace webrtc
94