| henrikg@webrtc.org | c13a537 | 2014-01-30 09:50:46 +0000 | [diff] [blame] | 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 "webrtc/modules/audio_processing/typing_detection.h" |
| 12 | |
| 13 | namespace webrtc { |
| 14 | |
| 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 | |
| 30 | TypingDetection::~TypingDetection() {} |
| 31 | |
| 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 | |
| 65 | int TypingDetection::TimeSinceLastDetectionInSeconds() { |
| 66 | // Round to whole seconds. |
| 67 | return (time_since_last_typing_ + 50) / 100; |
| 68 | } |
| 69 | |
| 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 |