Fabio
c36510c21e
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32 lines
1.1 KiB
C++
32 lines
1.1 KiB
C++
#pragma once
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// LFM3-Audio ASR input: 16 kHz mono audio and its 128-bin log-mel features
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// (n_fft = win = 400, hop 160, Slaney, no centering), scaled as (logmel + 4) / 4.
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#include "engine/framework/runtime/session.h"
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#include <cstddef>
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#include <cstdint>
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#include <vector>
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namespace engine::community_models::lfm3_audio {
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// Mixdown and resampling with libsoxr HQ (librosa soxr_hq, as HF loads audio); the torchaudio sinc resampler
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// only when libsoxr is absent.
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std::vector<float> lfm3_audio_mono_16k(const runtime::AudioBuffer & audio);
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int64_t lfm3_feature_frames(int64_t samples); // 1 + ceil(max(n-400,0)/160)
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int64_t lfm3_audio_tokens(int64_t frames); // ceil(frames/8)
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struct Lfm3Features { // feature-major [128][frames]
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std::vector<float> values;
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int64_t frames = 0;
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};
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class Lfm3FeatureExtractor {
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public:
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Lfm3FeatureExtractor();
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// Right-pads to whole frames (at least one); with LFM3_AUDIO_DUMP_DIR set it writes the features dump.
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[[nodiscard]] Lfm3Features extract(const std::vector<float> & mono16k, size_t threads = 0) const;
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};
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} // namespace engine::community_models::lfm3_audio
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