I’ve needed to detect a frequency of an audio signal a couple of times in my life, but I cannot for the love of me remember what does the FFT output actually mean. So I took this knowledge out of my latest project and packed it up in this crate.

Also this is my first potentially useful published crate, so if I missed anything, please let me know!

  • BB_C@programming.dev
    0·
    5 months ago
        /// # Panics
    ///
    /// - if `samples.len()` does not match the `sample_count` passed to [Self::new]
    /// - if there are `NaN`s in the sample slice

    Since this is library code, why not make the function return a Result?

    • anton@lemmy.blahaj.zone
      0·
      5 months ago

      The new version seems to fix that since your comment was written, but it will stil panics if less than 2 samples are provided, unless the crate it wraps panics at an earlier point.

      let peak = buf
            .iter()
            .copied()
            .enumerate()
            .take(self.sample_count / 2)
            .max_by_key(|(_, s)| (s.abs() * 1000.0) as u32)
            .expect("to have at least 1 sample");