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// 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