core/audio/audio_spectrogram
library
Classes
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ProcessedAudio
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Container for PCM audio data loaded from a file.
Functions
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applyMelFilterbank(List<Float64List> spectrogram, List<Float64List> filterbank)
→ List<Float64List>
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Applies a Mel filterbank to a power spectrogram.
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calculateSpectrogram(List<double> samples, {int? hopSize, int fftSize = 2048})
→ List<Float64List>
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Computes the power spectrogram via Short-Time Fourier Transform (STFT).
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createMelFilterbank({required int sampleRate, required int nFft, int nMels = 128, double fMin = 0.0, double? fMax})
→ List<Float64List>
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Creates a Mel filterbank matrix.
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hzToMel(double hz)
→ double
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loadAudio(String filePath, int sampleRate)
→ Future<ProcessedAudio>
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Decodes a WAV file into raw PCM samples (mono), resampled to
sampleRate.
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melSpectrogram(String filePath, {int sampleRate = 22050, int nFft = 2048, int? hopLength, int nMels = 128, double fMin = 0.0, double? fMax, double topDb = 80.0})
→ Future<List<Float64List>>
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Loads a WAV file and computes its Mel-frequency spectrogram in decibels (dB).
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melToHz(double mel)
→ double
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powerSpectrogram(String filePath, {int sampleRate = 22050, int nFft = 2048, int? hopLength, double topDb = 80.0})
→ Future<List<Float64List>>
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Loads a WAV file and computes its Power spectrogram via STFT in decibels (dB).
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powerToDb(List<Float64List> spectrogram, {double topDb = 80.0})
→ List<Float64List>
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Converts a power spectrogram (amplitude squared) to decibel (dB) units.
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savePowerSpectrogramPng(String wavPath, String pngPath, {int sampleRate = 22050, int nFft = 2048, int? hopLength, double topDb = 80.0, String title = 'Power Spectrogram', int plotWidth = 1000, int plotHeight = 400, bool useNearest = true})
→ Future<void>
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Generates a Power spectrogram (linear frequency) from a WAV file and saves it as a PNG.
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saveSpectrogramImage(List<Float64List> spectrogramDb, String outputPath, {required int sampleRate, required int hopLength, double fMin = 0.0, double? fMax, double topDb = 80.0, String title = 'Spectrogram', int plotWidth = 800, int plotHeight = 256, bool useNearest = true, bool isMel = true})
→ Future<void>
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Renders a Mel spectrogram in dB to a PNG image file.
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saveSpectrogramPng(String wavPath, String pngPath, {int sampleRate = 22050, int nFft = 2048, int? hopLength, int nMels = 128, double fMin = 0.0, double? fMax, double topDb = 80.0, String title = 'Mel-frequency spectrogram', int plotWidth = 1000, int plotHeight = 400, bool useNearest = true})
→ Future<void>
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Generates a Mel-frequency spectrogram from a WAV file and saves it as a PNG image.
