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75 lines
2.3 KiB
75 lines
2.3 KiB
// Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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#include "kaldi/feat/feature-mfcc.h"
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#include "kaldi/matrix/kaldi-vector.h"
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namespace ppspeech {
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struct MfccOptions {
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kaldi::MfccOptions mfcc_opts;
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kaldi::BaseFloat streaming_chunk; // second
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MfccOptions() : streaming_chunk(0.1), mfcc_opts() {}
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void Register(kaldi::OptionsItf* opts) {
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opts->Register("streaming-chunk",
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&streaming_chunk,
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"streaming chunk size, default: 0.1 sec");
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mfcc_opts.Register(opts);
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}
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};
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class Mfcc : public FrontendInterface {
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public:
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explicit Mfcc(const MfccOptions& opts,
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unique_ptr<FrontendInterface> base_extractor);
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virtual void Accept(const kaldi::VectorBase<kaldi::BaseFloat>& inputs);
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virtual bool Read(kaldi::Vector<kaldi::BaseFloat>* feats);
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// the dim_ is the dim of single frame feature
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virtual size_t Dim() const { return computer_.Dim(); }
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virtual void SetFinished() { base_extractor_->SetFinished(); }
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virtual bool IsFinished() const { return base_extractor_->IsFinished(); }
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virtual void Reset() {
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base_extractor_->Reset();
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remained_wav_.Resize(0);
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}
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private:
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bool Compute(const kaldi::Vector<kaldi::BaseFloat>& waves,
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kaldi::Vector<kaldi::BaseFloat>* feats);
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MfccOptions opts_;
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std::unique_ptr<FrontendInterface> base_extractor_;
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FeatureWindowFunction window_function_;
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kaldi::MfccComputer computer_;
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// features_ is the Mfcc or Plp or Fbank features that we have already
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// computed.
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kaldi::Vector<kaldi::BaseFloat> features_;
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kaldi::Vector<kaldi::BaseFloat> remained_wav_;
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DISALLOW_COPY_AND_ASSIGN(Fbank);
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};
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} // namespace ppspeech
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