47 lines
1.2 KiB
C++
47 lines
1.2 KiB
C++
// sherpa-onnx/csrc/sherpa-alsa.h
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//
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// Copyright (c) 2022-2023 Xiaomi Corporation
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#ifndef SHERPA_ONNX_CSRC_ALSA_H_
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#define SHERPA_ONNX_CSRC_ALSA_H_
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#include <memory>
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#include <vector>
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#include "alsa/asoundlib.h"
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#include "sherpa-onnx/csrc/resample.h"
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namespace sherpa_onnx {
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class Alsa {
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public:
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explicit Alsa(const char *device_name);
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~Alsa();
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// This is a blocking read.
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//
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// @param num_samples Number of samples to read.
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//
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// The returned value is valid until the next call to Read().
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const std::vector<float> &Read(int32_t num_samples);
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int32_t GetExpectedSampleRate() const { return expected_sample_rate_; }
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int32_t GetActualSampleRate() const { return actual_sample_rate_; }
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private:
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snd_pcm_t *capture_handle_;
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int32_t expected_sample_rate_ = 16000;
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int32_t actual_sample_rate_;
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int32_t actual_channel_count_ = 1;
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std::unique_ptr<LinearResample> resampler_;
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std::vector<int16_t> samples_; // directly from the microphone
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std::vector<float> samples1_; // normalized version of samples_
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std::vector<float> samples2_; // possibly resampled from samples1_
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};
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} // namespace sherpa_onnx
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#endif // SHERPA_ONNX_CSRC_ALSA_H_
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