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79 lines
2.3 KiB
C++
79 lines
2.3 KiB
C++
/**
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* Copyright (c) 2023 Xiaomi Corporation (authors: Fangjun Kuang)
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*
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* See LICENSE for clarification regarding multiple authors
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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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*/
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#ifndef KALDIFEAT_CSRC_WHISPER_FBANK_H_
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#define KALDIFEAT_CSRC_WHISPER_FBANK_H_
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#include <memory>
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#include <string>
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#include <vector>
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#include "kaldifeat/csrc/feature-common.h"
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#include "kaldifeat/csrc/feature-window.h"
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#include "kaldifeat/csrc/mel-computations.h"
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namespace kaldifeat {
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struct WhisperFbankOptions {
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FrameExtractionOptions frame_opts;
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// for large v3, please use 128
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int32_t num_mels = 80;
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torch::Device device{"cpu"};
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std::string ToString() const {
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std::ostringstream os;
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os << "WhisperFbankOptions(";
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os << "frame_opts=" << frame_opts.ToString() << ", ";
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os << "num_mels=" << num_mels << ", ";
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os << "device=\"" << device << "\")";
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return os.str();
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}
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};
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class WhisperFbankComputer {
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public:
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// note: Only frame_opts.device is used. All other fields from frame_opts
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// are ignored
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explicit WhisperFbankComputer(const WhisperFbankOptions &opts = {});
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int32_t Dim() const { return 80; }
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const FrameExtractionOptions &GetFrameOptions() const {
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return opts_.frame_opts;
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}
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const WhisperFbankOptions &GetOptions() const { return opts_; }
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torch::Tensor Compute(torch::Tensor /*signal_raw_log_energy*/,
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float /*vtln_warp*/, const torch::Tensor &signal_frame);
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// if true, compute log_energy_pre_window but after dithering and dc removal
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bool NeedRawLogEnergy() const { return false; }
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using Options = WhisperFbankOptions;
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private:
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WhisperFbankOptions opts_;
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std::unique_ptr<MelBanks> mel_banks_;
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};
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using WhisperFbank = OfflineFeatureTpl<WhisperFbankComputer>;
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} // namespace kaldifeat
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#endif // KALDIFEAT_CSRC_WHISPER_FBANK_H_
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