/**
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* Copyright FunASR (https://github.com/alibaba-damo-academy/FunASR). All Rights Reserved.
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* MIT License (https://opensource.org/licenses/MIT)
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*/
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#include <fstream>
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#include "precomp.h"
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namespace funasr {
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void FsmnVadOnline::FbankKaldi(float sample_rate, std::vector<std::vector<float>> &vad_feats,
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std::vector<float> &waves) {
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knf::OnlineFbank fbank(fbank_opts_);
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// cache merge
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waves.insert(waves.begin(), input_cache_.begin(), input_cache_.end());
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int frame_number = ComputeFrameNum(waves.size(), frame_sample_length_, frame_shift_sample_length_);
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// Send the audio after the last frame shift position to the cache
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input_cache_.clear();
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input_cache_.insert(input_cache_.begin(), waves.begin() + frame_number * frame_shift_sample_length_, waves.end());
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if (frame_number == 0) {
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return;
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}
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// Delete audio that haven't undergone fbank processing
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waves.erase(waves.begin() + (frame_number - 1) * frame_shift_sample_length_ + frame_sample_length_, waves.end());
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std::vector<float> buf(waves.size());
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for (int32_t i = 0; i != waves.size(); ++i) {
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buf[i] = waves[i] * 32768;
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}
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fbank.AcceptWaveform(sample_rate, buf.data(), buf.size());
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// fbank.AcceptWaveform(sample_rate, &waves[0], waves.size());
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int32_t frames = fbank.NumFramesReady();
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for (int32_t i = 0; i != frames; ++i) {
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const float *frame = fbank.GetFrame(i);
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vector<float> frame_vector(frame, frame + fbank_opts_.mel_opts.num_bins);
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vad_feats.emplace_back(frame_vector);
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}
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}
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void FsmnVadOnline::ExtractFeats(float sample_rate, vector<std::vector<float>> &vad_feats,
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vector<float> &waves, bool input_finished) {
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FbankKaldi(sample_rate, vad_feats, waves);
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// cache deal & online lfr,cmvn
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if (vad_feats.size() > 0) {
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if (!reserve_waveforms_.empty()) {
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waves.insert(waves.begin(), reserve_waveforms_.begin(), reserve_waveforms_.end());
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}
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if (lfr_splice_cache_.empty()) {
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for (int i = 0; i < (lfr_m - 1) / 2; i++) {
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lfr_splice_cache_.emplace_back(vad_feats[0]);
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}
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}
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if (vad_feats.size() + lfr_splice_cache_.size() >= lfr_m) {
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vad_feats.insert(vad_feats.begin(), lfr_splice_cache_.begin(), lfr_splice_cache_.end());
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int frame_from_waves = (waves.size() - frame_sample_length_) / frame_shift_sample_length_ + 1;
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int minus_frame = reserve_waveforms_.empty() ? (lfr_m - 1) / 2 : 0;
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int lfr_splice_frame_idxs = OnlineLfrCmvn(vad_feats, input_finished);
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int reserve_frame_idx = lfr_splice_frame_idxs - minus_frame;
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reserve_waveforms_.clear();
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reserve_waveforms_.insert(reserve_waveforms_.begin(),
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waves.begin() + reserve_frame_idx * frame_shift_sample_length_,
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waves.begin() + frame_from_waves * frame_shift_sample_length_);
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int sample_length = (frame_from_waves - 1) * frame_shift_sample_length_ + frame_sample_length_;
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waves.erase(waves.begin() + sample_length, waves.end());
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} else {
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reserve_waveforms_.clear();
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reserve_waveforms_.insert(reserve_waveforms_.begin(),
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waves.begin() + frame_sample_length_ - frame_shift_sample_length_, waves.end());
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lfr_splice_cache_.insert(lfr_splice_cache_.end(), vad_feats.begin(), vad_feats.end());
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}
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} else {
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if (input_finished) {
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if (!reserve_waveforms_.empty()) {
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waves = reserve_waveforms_;
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}
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vad_feats = lfr_splice_cache_;
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OnlineLfrCmvn(vad_feats, input_finished);
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}
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}
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if(input_finished){
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Reset();
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ResetCache();
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}
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}
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int FsmnVadOnline::OnlineLfrCmvn(vector<vector<float>> &vad_feats, bool input_finished) {
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vector<vector<float>> out_feats;
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int T = vad_feats.size();
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int T_lrf = ceil((T - (lfr_m - 1) / 2) / lfr_n);
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int lfr_splice_frame_idxs = T_lrf;
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vector<float> p;
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for (int i = 0; i < T_lrf; i++) {
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if (lfr_m <= T - i * lfr_n) {
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for (int j = 0; j < lfr_m; j++) {
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p.insert(p.end(), vad_feats[i * lfr_n + j].begin(), vad_feats[i * lfr_n + j].end());
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}
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out_feats.emplace_back(p);
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p.clear();
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} else {
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if (input_finished) {
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int num_padding = lfr_m - (T - i * lfr_n);
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for (int j = 0; j < (vad_feats.size() - i * lfr_n); j++) {
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p.insert(p.end(), vad_feats[i * lfr_n + j].begin(), vad_feats[i * lfr_n + j].end());
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}
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for (int j = 0; j < num_padding; j++) {
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p.insert(p.end(), vad_feats[vad_feats.size() - 1].begin(), vad_feats[vad_feats.size() - 1].end());
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}
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out_feats.emplace_back(p);
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} else {
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lfr_splice_frame_idxs = i;
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break;
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}
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}
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}
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lfr_splice_frame_idxs = std::min(T - 1, lfr_splice_frame_idxs * lfr_n);
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lfr_splice_cache_.clear();
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lfr_splice_cache_.insert(lfr_splice_cache_.begin(), vad_feats.begin() + lfr_splice_frame_idxs, vad_feats.end());
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// Apply cmvn
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for (auto &out_feat: out_feats) {
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for (int j = 0; j < means_list_.size(); j++) {
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out_feat[j] = (out_feat[j] + means_list_[j]) * vars_list_[j];
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}
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}
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vad_feats = out_feats;
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return lfr_splice_frame_idxs;
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}
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std::vector<std::vector<int>>
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FsmnVadOnline::Infer(std::vector<float> &waves, bool input_finished) {
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std::vector<std::vector<float>> vad_feats;
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std::vector<std::vector<float>> vad_probs;
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ExtractFeats(vad_sample_rate_, vad_feats, waves, input_finished);
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fsmnvad_handle_->Forward(vad_feats, &vad_probs, &in_cache_, input_finished);
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std::vector<std::vector<int>> vad_segments;
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vad_segments = vad_scorer(vad_probs, waves, input_finished, true, vad_silence_duration_, vad_max_len_,
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vad_speech_noise_thres_, vad_sample_rate_);
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return vad_segments;
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}
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void FsmnVadOnline::InitCache(){
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std::vector<float> cache_feats(128 * 19 * 1, 0);
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for (int i=0;i<4;i++){
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in_cache_.emplace_back(cache_feats);
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}
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};
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void FsmnVadOnline::Reset(){
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in_cache_.clear();
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InitCache();
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};
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void FsmnVadOnline::Test() {
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}
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void FsmnVadOnline::InitOnline(std::shared_ptr<Ort::Session> &vad_session,
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Ort::Env &env,
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std::vector<const char *> &vad_in_names,
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std::vector<const char *> &vad_out_names,
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knf::FbankOptions &fbank_opts,
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std::vector<float> &means_list,
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std::vector<float> &vars_list,
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int vad_sample_rate,
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int vad_silence_duration,
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int vad_max_len,
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double vad_speech_noise_thres) {
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vad_session_ = vad_session;
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vad_in_names_ = vad_in_names;
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vad_out_names_ = vad_out_names;
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fbank_opts_ = fbank_opts;
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means_list_ = means_list;
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vars_list_ = vars_list;
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vad_sample_rate_ = vad_sample_rate;
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vad_silence_duration_ = vad_silence_duration;
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vad_max_len_ = vad_max_len;
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vad_speech_noise_thres_ = vad_speech_noise_thres;
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}
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FsmnVadOnline::~FsmnVadOnline() {
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}
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FsmnVadOnline::FsmnVadOnline(FsmnVad* fsmnvad_handle):fsmnvad_handle_(std::move(fsmnvad_handle)),session_options_{}{
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InitCache();
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InitOnline(fsmnvad_handle_->vad_session_,
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fsmnvad_handle_->env_,
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fsmnvad_handle_->vad_in_names_,
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fsmnvad_handle_->vad_out_names_,
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fsmnvad_handle_->fbank_opts_,
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fsmnvad_handle_->means_list_,
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fsmnvad_handle_->vars_list_,
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fsmnvad_handle_->vad_sample_rate_,
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fsmnvad_handle_->vad_silence_duration_,
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fsmnvad_handle_->vad_max_len_,
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fsmnvad_handle_->vad_speech_noise_thres_);
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}
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} // namespace funasr
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