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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/app_list/speech_ui_model.h"
#include <stdint.h>
#include <algorithm>
#include <limits>
namespace app_list {
namespace {
// The default sound level, just gotten from the developer device.
const int16_t kDefaultSoundLevel = 200;
} // namespace
SpeechUIModel::SpeechUIModel()
: is_final_(false),
sound_level_(0),
state_(app_list::SPEECH_RECOGNITION_OFF),
minimum_sound_level_(kDefaultSoundLevel),
maximum_sound_level_(kDefaultSoundLevel) {
}
SpeechUIModel::~SpeechUIModel() {}
void SpeechUIModel::SetSpeechResult(const base::string16& result,
bool is_final) {
if (result_ == result && is_final_ == is_final)
return;
result_ = result;
is_final_ = is_final;
FOR_EACH_OBSERVER(SpeechUIModelObserver,
observers_,
OnSpeechResult(result, is_final));
}
void SpeechUIModel::UpdateSoundLevel(int16_t level) {
if (sound_level_ == level)
return;
sound_level_ = level;
// Tweak the sound level limits adaptively.
// - min is the minimum value during the speech recognition starts but speech
// itself hasn't started.
// - max is the maximum value when the user speaks.
if (state_ == SPEECH_RECOGNITION_IN_SPEECH)
maximum_sound_level_ = std::max(level, maximum_sound_level_);
else
minimum_sound_level_ = std::min(level, minimum_sound_level_);
if (maximum_sound_level_ < minimum_sound_level_) {
maximum_sound_level_ = std::max(
static_cast<int16_t>(minimum_sound_level_ + kDefaultSoundLevel),
std::numeric_limits<int16_t>::max());
}
int16_t range = maximum_sound_level_ - minimum_sound_level_;
uint8_t visible_level = 0;
if (range > 0) {
int16_t visible_level_in_range = std::min(
std::max(minimum_sound_level_, sound_level_), maximum_sound_level_);
visible_level = (visible_level_in_range - minimum_sound_level_) *
std::numeric_limits<uint8_t>::max() / range;
}
FOR_EACH_OBSERVER(SpeechUIModelObserver,
observers_,
OnSpeechSoundLevelChanged(visible_level));
}
void SpeechUIModel::SetSpeechRecognitionState(SpeechRecognitionState new_state,
bool always_show_ui) {
// Don't show the speech view on a change to a network error or if the state
// has not changed, unless |always_show_ui| is true.
if (!always_show_ui &&
(state_ == new_state || new_state == SPEECH_RECOGNITION_NETWORK_ERROR)) {
state_ = new_state;
return;
}
state_ = new_state;
// Revert the min/max sound level to the default.
if (state_ != SPEECH_RECOGNITION_RECOGNIZING &&
state_ != SPEECH_RECOGNITION_IN_SPEECH) {
minimum_sound_level_ = kDefaultSoundLevel;
maximum_sound_level_ = kDefaultSoundLevel;
}
FOR_EACH_OBSERVER(SpeechUIModelObserver,
observers_,
OnSpeechRecognitionStateChanged(new_state));
}
void SpeechUIModel::AddObserver(SpeechUIModelObserver* observer) {
observers_.AddObserver(observer);
}
void SpeechUIModel::RemoveObserver(SpeechUIModelObserver* observer) {
observers_.RemoveObserver(observer);
}
} // namespace app_list
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