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65 lines
2.3 KiB
65 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 "base/common.h"
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#include "frontend/audio/frontend_itf.h"
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#include "kaldi/matrix/kaldi-matrix.h"
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#include "kaldi/util/options-itf.h"
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namespace ppspeech {
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struct DecibelNormalizerOptions {
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float target_db;
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float max_gain_db;
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bool convert_int_float;
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DecibelNormalizerOptions()
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: target_db(-20), max_gain_db(300.0), convert_int_float(false) {}
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void Register(kaldi::OptionsItf* opts) {
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opts->Register(
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"target-db", &target_db, "target db for db normalization");
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opts->Register(
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"max-gain-db", &max_gain_db, "max gain db for db normalization");
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opts->Register("convert-int-float",
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&convert_int_float,
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"if convert int samples to float");
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}
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};
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class DecibelNormalizer : public FrontendInterface {
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public:
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explicit DecibelNormalizer(
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const DecibelNormalizerOptions& opts,
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std::unique_ptr<FrontendInterface> base_extractor);
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virtual void Accept(const kaldi::VectorBase<kaldi::BaseFloat>& waves);
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virtual bool Read(kaldi::Vector<kaldi::BaseFloat>* waves);
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// noramlize audio, the dim is 1.
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virtual size_t Dim() const { return 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() { base_extractor_->Reset(); }
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private:
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bool Compute(kaldi::VectorBase<kaldi::BaseFloat>* waves) const;
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DecibelNormalizerOptions opts_;
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size_t dim_;
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std::unique_ptr<FrontendInterface> base_extractor_;
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kaldi::Vector<kaldi::BaseFloat> waveform_;
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};
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} // namespace ppspeech
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