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70 lines
2.2 KiB
70 lines
2.2 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/frontend_itf.h"
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namespace ppspeech {
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// waves cache
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class AudioCache : public FrontendInterface {
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public:
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explicit AudioCache(int buffer_size = 1000 * kint16max,
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bool to_float32 = false);
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virtual void Accept(const std::vector<BaseFloat>& waves);
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virtual bool Read(std::vector<kaldi::BaseFloat>* waves);
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// the audio dim is 1, one sample, which is useless,
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// so we return size_(cache samples) instead.
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virtual size_t Dim() const { return size_; }
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virtual void SetFinished() {
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std::lock_guard<std::mutex> lock(mutex_);
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finished_ = true;
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}
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virtual bool IsFinished() const { return finished_; }
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void Reset() override {
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offset_ = 0;
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size_ = 0;
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finished_ = false;
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nsamples_ = 0;
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}
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private:
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kaldi::BaseFloat Convert2PCM32(kaldi::BaseFloat val);
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std::vector<kaldi::BaseFloat> ring_buffer_;
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size_t offset_; // offset in ring_buffer_, begin of data
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size_t size_; // samples in ring_buffer_, size of valid data
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size_t capacity_; // capacity of ring_buffer_, full size of data buffer,
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// unit: sample
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bool finished_; // reach audio end
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std::mutex mutex_;
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std::condition_variable ready_feed_condition_;
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kaldi::int32 timeout_; // millisecond
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bool to_float32_; // int16 -> float32. used in linear_spectrogram
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int32 nsamples_; // number samples readed.
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DISALLOW_COPY_AND_ASSIGN(AudioCache);
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};
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} // namespace ppspeech
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