Fabio
c36510c21e
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56 lines
1.9 KiB
C++
56 lines
1.9 KiB
C++
#pragma once
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#include "engine/framework/audio/nemo_mel_frontend.h"
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#include "engine/framework/runtime/session.h"
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#include <cstdint>
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#include <optional>
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#include <vector>
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namespace engine::models::nemotron_transcribe {
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struct FrontendConfig {
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int sample_rate = 16000;
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int mel_bins = 128;
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int n_fft = 512;
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int window_length = 400;
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int hop_length = 160;
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float preemphasis = 0.97f;
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};
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struct MelFeatures {
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int64_t frames = 0;
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int bins = 0;
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double duration_seconds = 0.0;
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// Unnormalized log-mel, [frames, bins]. ASR normalization is utterance-wide.
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std::vector<float> values;
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};
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class Frontend {
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public:
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// Released Nemotron 3.5 constants are BF16. Production supplies the exact
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// checkpoint window; an empty vector retains the F32 synthetic-test window.
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Frontend(FrontendConfig config, std::vector<float> trained_filterbank,
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std::vector<float> trained_window = {});
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MelFeatures extract(const runtime::AudioBuffer & audio, int threads = 1) const;
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const FrontendConfig & config() const noexcept { return config_; }
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private:
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FrontendConfig config_;
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audio::NemoMelFrontend frontend_;
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};
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// NeMo normalize_batch("per_feature"), unbiased std plus 1e-5.
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std::vector<float> normalize_asr_features(const MelFeatures & features);
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// Native SALM's conservative silence gate: both peak and RMS must be quiet.
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bool is_near_silent(const std::vector<float> & samples);
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// Validate the original interleaved audio and return its per-channel duration.
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double validate_input_audio(const runtime::AudioBuffer & input, double maximum_seconds = 3600.0);
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// The session accepts ordinary PCM formats without changing shared loaders.
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// No buffer is allocated for the matched 16 kHz mono input path.
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std::optional<runtime::AudioBuffer> normalize_input_audio(const runtime::AudioBuffer & input);
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} // namespace engine::models::nemotron_transcribe
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