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-rw-r--r--dom/media/webspeech/recognition/endpointer.cc193
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diff --git a/dom/media/webspeech/recognition/endpointer.cc b/dom/media/webspeech/recognition/endpointer.cc
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--- a/dom/media/webspeech/recognition/endpointer.cc
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-// Copyright (c) 2013 The Chromium Authors. All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "endpointer.h"
-
-#include "AudioSegment.h"
-
-namespace {
-const int kFrameRate = 200; // 1 frame = 5ms of audio.
-}
-
-namespace mozilla {
-
-Endpointer::Endpointer(int sample_rate)
- : speech_input_possibly_complete_silence_length_us_(-1),
- speech_input_complete_silence_length_us_(-1),
- audio_frame_time_us_(0),
- sample_rate_(sample_rate),
- frame_size_(0) {
- Reset();
-
- frame_size_ = static_cast<int>(sample_rate / static_cast<float>(kFrameRate));
-
- speech_input_minimum_length_us_ =
- static_cast<int64_t>(1.7 * 1000000);
- speech_input_complete_silence_length_us_ =
- static_cast<int64_t>(0.5 * 1000000);
- long_speech_input_complete_silence_length_us_ = -1;
- long_speech_length_us_ = -1;
- speech_input_possibly_complete_silence_length_us_ =
- 1 * 1000000;
-
- // Set the default configuration for Push To Talk mode.
- EnergyEndpointerParams ep_config;
- ep_config.set_frame_period(1.0f / static_cast<float>(kFrameRate));
- ep_config.set_frame_duration(1.0f / static_cast<float>(kFrameRate));
- ep_config.set_endpoint_margin(0.2f);
- ep_config.set_onset_window(0.15f);
- ep_config.set_speech_on_window(0.4f);
- ep_config.set_offset_window(0.15f);
- ep_config.set_onset_detect_dur(0.09f);
- ep_config.set_onset_confirm_dur(0.075f);
- ep_config.set_on_maintain_dur(0.10f);
- ep_config.set_offset_confirm_dur(0.12f);
- ep_config.set_decision_threshold(1000.0f);
- ep_config.set_min_decision_threshold(50.0f);
- ep_config.set_fast_update_dur(0.2f);
- ep_config.set_sample_rate(static_cast<float>(sample_rate));
- ep_config.set_min_fundamental_frequency(57.143f);
- ep_config.set_max_fundamental_frequency(400.0f);
- ep_config.set_contamination_rejection_period(0.25f);
- energy_endpointer_.Init(ep_config);
-}
-
-void Endpointer::Reset() {
- old_ep_status_ = EP_PRE_SPEECH;
- waiting_for_speech_possibly_complete_timeout_ = false;
- waiting_for_speech_complete_timeout_ = false;
- speech_previously_detected_ = false;
- speech_input_complete_ = false;
- audio_frame_time_us_ = 0; // Reset time for packets sent to endpointer.
- speech_end_time_us_ = -1;
- speech_start_time_us_ = -1;
-}
-
-void Endpointer::StartSession() {
- Reset();
- energy_endpointer_.StartSession();
-}
-
-void Endpointer::EndSession() {
- energy_endpointer_.EndSession();
-}
-
-void Endpointer::SetEnvironmentEstimationMode() {
- Reset();
- energy_endpointer_.SetEnvironmentEstimationMode();
-}
-
-void Endpointer::SetUserInputMode() {
- energy_endpointer_.SetUserInputMode();
-}
-
-EpStatus Endpointer::Status(int64_t *time) {
- return energy_endpointer_.Status(time);
-}
-
-EpStatus Endpointer::ProcessAudio(const AudioChunk& raw_audio, float* rms_out) {
- MOZ_ASSERT(raw_audio.mBufferFormat == AUDIO_FORMAT_S16, "Audio is not in 16 bit format");
- const int16_t* audio_data = static_cast<const int16_t*>(raw_audio.mChannelData[0]);
- const int num_samples = raw_audio.mDuration;
- EpStatus ep_status = EP_PRE_SPEECH;
-
- // Process the input data in blocks of frame_size_, dropping any incomplete
- // frames at the end (which is ok since typically the caller will be recording
- // audio in multiples of our frame size).
- int sample_index = 0;
- while (sample_index + frame_size_ <= num_samples) {
- // Have the endpointer process the frame.
- energy_endpointer_.ProcessAudioFrame(audio_frame_time_us_,
- audio_data + sample_index,
- frame_size_,
- rms_out);
- sample_index += frame_size_;
- audio_frame_time_us_ += (frame_size_ * 1000000) /
- sample_rate_;
-
- // Get the status of the endpointer.
- int64_t ep_time;
- ep_status = energy_endpointer_.Status(&ep_time);
- if (old_ep_status_ != ep_status)
- fprintf(stderr, "Status changed old= %d, new= %d\n", old_ep_status_, ep_status);
-
- // Handle state changes.
- if ((EP_SPEECH_PRESENT == ep_status) &&
- (EP_POSSIBLE_ONSET == old_ep_status_)) {
- speech_end_time_us_ = -1;
- waiting_for_speech_possibly_complete_timeout_ = false;
- waiting_for_speech_complete_timeout_ = false;
- // Trigger SpeechInputDidStart event on first detection.
- if (false == speech_previously_detected_) {
- speech_previously_detected_ = true;
- speech_start_time_us_ = ep_time;
- }
- }
- if ((EP_PRE_SPEECH == ep_status) &&
- (EP_POSSIBLE_OFFSET == old_ep_status_)) {
- speech_end_time_us_ = ep_time;
- waiting_for_speech_possibly_complete_timeout_ = true;
- waiting_for_speech_complete_timeout_ = true;
- }
- if (ep_time > speech_input_minimum_length_us_) {
- // Speech possibly complete timeout.
- if ((waiting_for_speech_possibly_complete_timeout_) &&
- (ep_time - speech_end_time_us_ >
- speech_input_possibly_complete_silence_length_us_)) {
- waiting_for_speech_possibly_complete_timeout_ = false;
- }
- if (waiting_for_speech_complete_timeout_) {
- // The length of the silence timeout period can be held constant, or it
- // can be changed after a fixed amount of time from the beginning of
- // speech.
- bool has_stepped_silence =
- (long_speech_length_us_ > 0) &&
- (long_speech_input_complete_silence_length_us_ > 0);
- int64_t requested_silence_length;
- if (has_stepped_silence &&
- (ep_time - speech_start_time_us_) > long_speech_length_us_) {
- requested_silence_length =
- long_speech_input_complete_silence_length_us_;
- } else {
- requested_silence_length =
- speech_input_complete_silence_length_us_;
- }
-
- // Speech complete timeout.
- if ((ep_time - speech_end_time_us_) > requested_silence_length) {
- waiting_for_speech_complete_timeout_ = false;
- speech_input_complete_ = true;
- }
- }
- }
- old_ep_status_ = ep_status;
- }
- return ep_status;
-}
-
-} // namespace mozilla
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-18 12:47:18 +0000