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#![no_std]
extern crate smallvec;
use smallvec::SmallVec;
pub struct SyncDevice {
pub tracks: SmallVec<[SyncTrack; 64]>,
pub rpb: u8,
pub bpm: f64,
pub rps: f64,
pub is_paused: bool,
pub row: u32,
pub time: u32,
}
impl SyncDevice {
pub fn new(bpm: f64, rpb: u8) -> SyncDevice {
SyncDevice {
tracks: SmallVec::new(),
rpb: rpb,
bpm: bpm,
rps: rps(bpm, rpb),
is_paused: true,
row: 0,
time: 0,
}
}
pub fn set_row_from_time(&mut self) {
let r: f64 = (self.time as f64 / 1000.0) * self.rps + 0.5;
self.row = r as u32;
}
pub fn get_track_value(&self, track_id: usize) -> Result<f64, SyncError> {
if self.tracks.len() > track_id {
return Ok(self.tracks[track_id].value_at(self.row));
} else {
return Err(SyncError::TrackDoesntExist);
}
}
}
pub struct SyncTrack {
pub keys: SmallVec<[TrackKey; 64]>,
}
pub enum SyncError {
TrackDoesntExist
}
pub struct TrackKey {
pub row: u32,
pub value: f32,
pub key_type: KeyType,
}
pub enum KeyType {
Step,
Linear,
Smooth,
Ramp,
NOOP,
}
pub enum ActiveKeyIdx {
ExactRow(usize),
PrevRow(usize),
BeforeFirstRow,
AfterLastRow,
}
impl SyncTrack {
pub fn new() -> SyncTrack {
SyncTrack {
keys: SmallVec::new(),
}
}
pub fn add_key(&mut self, track_key: TrackKey) {
let res = self.find_active_key_idx_for_row(track_key.row);
if let Some(idx) = res {
use self::ActiveKeyIdx::*;
match idx {
ExactRow(n) => self.keys[n] = track_key,
PrevRow(n) => self.keys.insert(n+1, track_key),
BeforeFirstRow => self.keys.insert(0, track_key),
AfterLastRow => self.keys.push(track_key),
}
} else {
self.keys.push(track_key);
}
}
pub fn delete_key(&mut self, row: u32) {
if let Some(idx) = self.find_key_idx_by_row(row) {
self.keys.remove(idx);
}
}
pub fn find_key_idx_by_row(&self, row: u32) -> Option<usize> {
for (idx, key) in self.keys.iter().enumerate() {
if key.row == row {
return Some(idx);
}
}
None
}
pub fn value_at(&self, row: u32) -> f64 {
let hit_idx: usize;
if let Some(hit) = self.find_active_key_idx_for_row(row) {
use self::ActiveKeyIdx::*;
match hit {
ExactRow(n) => return self.keys[n].value as f64,
PrevRow(n) => hit_idx = n,
AfterLastRow => return self.keys[self.keys.len() - 1].value as f64,
BeforeFirstRow => return self.keys[0].value as f64,
}
} else {
return 0.0;
}
let cur_key = &self.keys[hit_idx];
let next_key = &self.keys[hit_idx + 1];
let t: f64 = ((row - cur_key.row) as f64) / ((next_key.row - cur_key.row) as f64);
let a: f64 = cur_key.value as f64;
let b: f64 = (next_key.value - cur_key.value) as f64;
use self::KeyType::*;
match cur_key.key_type {
Step => return a,
Linear => return a + b * t,
Smooth => return a + b * (t*t * (3.0 - 2.0 * t)),
Ramp => return a + b * t*t,
NOOP => return 0.0,
}
}
pub fn find_active_key_idx_for_row(&self, row: u32) -> Option<ActiveKeyIdx> {
if self.keys.len() == 0 {
return None;
}
let mut hit_idx: usize = 0;
let mut ret: Option<ActiveKeyIdx> = None;
for (idx, key) in self.keys.iter().enumerate() {
if key.row == row {
return Some(ActiveKeyIdx::ExactRow(idx));
} else if key.row < row {
hit_idx = idx;
ret = Some(ActiveKeyIdx::PrevRow(hit_idx));
}
}
if hit_idx == self.keys.len() - 1 {
return Some(ActiveKeyIdx::AfterLastRow);
}
if hit_idx == 0 && ret.is_none() {
return Some(ActiveKeyIdx::BeforeFirstRow);
}
ret
}
}
impl TrackKey {
pub fn new() -> TrackKey {
TrackKey {
row: 0,
value: 0.0,
key_type: KeyType::Step,
}
}
}
pub fn rps(bpm: f64, rpb: u8) -> f64 {
(bpm / 60.0) * (rpb as f64)
}
pub fn key_to_code(key: &KeyType) -> u8 {
use self::KeyType::*;
match *key {
Step => 0,
Linear => 1,
Smooth => 2,
Ramp => 3,
NOOP => 255,
}
}
pub fn code_to_key(code: u8) -> KeyType {
use self::KeyType::*;
match code {
0 => Step,
1 => Linear,
2 => Smooth,
3 => Ramp,
_ => NOOP,
}
}