processBlock() [1/2]

void fl::SoundLevelMeter::processBlock	(	const int16_t *	samples,
		size_t	count )

Process a block of int16 PCM samples.

Definition at line 96 of file audio.cpp.

                                                                       {
    // 1) compute block power → dBFS
    double sum_sq = 0.0;
    for (size_t i = 0; i < count; ++i) {
        double s = samples[i] / 32768.0; // normalize to ±1
        sum_sq += s * s;
    }
    double p = sum_sq / count; // mean power
    double dbfs = 10.0 * log10(p + 1e-12);
    current_dbfs_ = dbfs;
 
    // 2) update global floor (with optional smoothing)
    if (dbfs < dbfs_floor_global_) {
        if (smoothing_alpha_ <= 0.0) {
            dbfs_floor_global_ = dbfs;
        } else {
            dbfs_floor_global_ = smoothing_alpha_ * dbfs +
                                 (1.0 - smoothing_alpha_) * dbfs_floor_global_;
        }
        offset_ = spl_floor_ - dbfs_floor_global_;
    }
 
    // 3) estimate SPL
    current_spl_ = dbfs + offset_;
}

References current_dbfs_, current_spl_, dbfs_floor_global_, offset_, p, smoothing_alpha_, and spl_floor_.

Referenced by processBlock().

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