| // Copyright 2016 Google Inc. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "cobalt/speech/endpointer_delegate.h" |
| |
| #include "base/time.h" |
| |
| namespace cobalt { |
| namespace speech { |
| |
| namespace { |
| const int kEndPointerEstimationTimeInMillisecond = 300; |
| // If used in noisy conditions, the endpointer should be started and run in the |
| // EnvironmentEstimation mode, for at least 200ms, before switching to |
| // UserInputMode. |
| COMPILE_ASSERT(kEndPointerEstimationTimeInMillisecond >= 200, |
| in_environment_estimation_mode_for_at_least_200ms); |
| } // namespace |
| |
| EndPointerDelegate::EndPointerDelegate(int sample_rate) |
| : endpointer_(sample_rate), |
| num_samples_recorded_(0), |
| is_first_time_sound_started_(false) {} |
| |
| EndPointerDelegate::~EndPointerDelegate() {} |
| |
| void EndPointerDelegate::Start() { |
| num_samples_recorded_ = 0; |
| is_first_time_sound_started_ = false; |
| |
| endpointer_.StartSession(); |
| endpointer_.SetEnvironmentEstimationMode(); |
| } |
| |
| void EndPointerDelegate::Stop() { endpointer_.EndSession(); } |
| |
| bool EndPointerDelegate::IsFirstTimeSoundStarted( |
| const ShellAudioBus& audio_bus) { |
| if (is_first_time_sound_started_) { |
| return false; |
| } |
| |
| num_samples_recorded_ += static_cast<int>(audio_bus.frames()); |
| if (endpointer_.IsEstimatingEnvironment() && |
| num_samples_recorded_ * 1000 / endpointer_.sample_rate() > |
| kEndPointerEstimationTimeInMillisecond) { |
| // Switch to user input mode. |
| endpointer_.SetUserInputMode(); |
| } |
| |
| endpointer_.ProcessAudio(audio_bus, NULL); |
| int64_t ep_time; |
| content::EpStatus status = endpointer_.Status(&ep_time); |
| if (status == content::EP_POSSIBLE_ONSET) { |
| is_first_time_sound_started_ = true; |
| } |
| |
| return is_first_time_sound_started_; |
| } |
| |
| } // namespace speech |
| } // namespace cobalt |