tek/device/mixer.rs

#[allow(unused)] use crate::*;

#[derive(Debug, Default)]
pub enum MixingMode {
    #[default]
    Summing,
    Average,
}

pub fn mix_summing <const N: usize> (
    buffer: &mut [Vec<f32>], gain: f32, frames: usize, mut next: impl FnMut()->Option<[f32;N]>,
) -> bool {
    let channels = buffer.len();
    for index in 0..frames {
        if let Some(frame) = next() {
            for (channel, sample) in frame.iter().enumerate() {
                let channel = channel % channels;
                buffer[channel][index] += sample * gain;
            }
        } else {
            return false
        }
    }
    true
}

pub fn mix_average <const N: usize> (
    buffer: &mut [Vec<f32>], gain: f32, frames: usize, mut next: impl FnMut()->Option<[f32;N]>,
) -> bool {
    let channels = buffer.len();
    for index in 0..frames {
        if let Some(frame) = next() {
            for (channel, sample) in frame.iter().enumerate() {
                let channel = channel % channels;
                let value = buffer[channel][index];
                buffer[channel][index] = (value + sample * gain) / 2.0;
            }
        } else {
            return false
        }
    }
    true
}