rhythm-open-exchange 0.2.2

A try to create the ffmpeg of vsrg
Documentation 
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//! Timing points for BPM and scroll velocity changes.

use bincode::{Decode, Encode};

/// A point that defines timing or scroll velocity changes.
#[derive(Debug, Clone, PartialEq, Encode, Decode)]
pub struct TimingPoint {
    /// Position in microseconds.
    pub time_us: i64,
    /// Beats per minute (only meaningful if not inherited).
    pub bpm: f32,
    /// Time signature numerator (e.g., 4 for 4/4 time).
    pub signature: u8,
    /// If true, this is a scroll velocity change, not a BPM change.
    pub is_inherited: bool,
    /// Scroll velocity multiplier (1.0 = normal speed).
    pub scroll_speed: f32,
}

impl TimingPoint {
    /// Create a new BPM timing point.
    #[must_use]
    pub fn bpm(time_us: i64, bpm: f32) -> Self {
        Self {
            time_us,
            bpm,
            signature: 4,
            is_inherited: false,
            scroll_speed: 1.0,
        }
    }

    /// Create a scroll velocity change point.
    #[must_use]
    pub fn sv(time_us: i64, scroll_speed: f32) -> Self {
        Self {
            time_us,
            bpm: 0.0,
            signature: 4,
            is_inherited: true,
            scroll_speed,
        }
    }
}