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    1zhouhaoran1/moonmel/src/features/loudness does not have a README file

    BiquadCoeffs

    source
    pub(all) struct BiquadCoeffs {
      b0 : Double
      b1 : Double
      b2 : Double
      a1 : Double
      a2 : Double
    } derive(
    Debug    )

    Biquad second-order IIR filter coefficients.

    BiquadCoeffs::to_repr

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    BiquadFilter

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    pub(all) struct BiquadFilter {
      coeffs : BiquadCoeffs
      d1 : Double
      d2 : Double
    } derive(
    Debug    )

    Direct Form II Transposed Biquad Filter state.

    BiquadFilter::filter_array

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    fn BiquadFilter::filter_array(self : BiquadFilter, samples : Array[Double]) -> Array[Double]

    Filter an array of samples through the biquad filter.

    BiquadFilter::new

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    Create a new Biquad filter instance.

    BiquadFilter::process_sample

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    fn BiquadFilter::process_sample(self : BiquadFilter, x : Double) -> Double

    Process a single sample through the biquad filter.

    BiquadFilter::reset

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    fn BiquadFilter::reset(self : BiquadFilter) -> Unit

    Reset filter internal memory states.

    BiquadFilter::to_repr

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    LoudnessResult

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    pub(all) struct LoudnessResult {
      integrated : Double
      loudness_range : Double
      momentary_max : Double
      short_term_max : Double
      true_peak : Double
    } derive(
    Debug    )

    Comprehensive ITU-R BS.1770-4 / EBU R128 Loudness Result.

    LoudnessResult::to_repr

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    apply_k_weighting

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    fn apply_k_weighting(samples : Array[Double], sample_rate : Int) -> Array[Double]

    Apply cascaded K-weighting filters (Pre-filter then RLB weighting filter) to audio samples.

    loudness_meter

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    Measure ITU-R BS.1770-4 Loudness for a single-channel AudioBuffer.

    pre_filter_coeffs

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    fn pre_filter_coeffs(sample_rate : Int) -> BiquadCoeffs

    Compute Stage 1 High-Shelf (Pre-filter) coefficients for given sample rate (ITU-R BS.1770-4).

    rlb_filter_coeffs

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    fn rlb_filter_coeffs(sample_rate : Int) -> BiquadCoeffs

    Compute Stage 2 High-Pass (RLB weighting) coefficients for given sample rate (ITU-R BS.1770-4).

    true_peak_db

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    fn true_peak_db(samples : Array[Double], sample_rate : Int) -> Result[Double, 
    MelError    ]

    Calculate True Peak in dBFS via 4x oversampling.

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