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use std::collections::HashMap;
use std::sync::Arc;
use rustfft::FFTplanner;
use common;
use dct1::*;
use dct2::*;
use dct2::dct2_butterflies::*;
use dct3::*;
use dct3::dct3_butterflies::*;
use dct4::*;
use mdct::*;
const DCT2_BUTTERFLIES: [usize; 4] = [2, 4, 8, 16];
const DCT3_BUTTERFLIES: [usize; 4] = [2, 4, 8, 16];
pub struct DCTplanner<T> {
fft_planner: FFTplanner<T>,
dct1_cache: HashMap<usize, Arc<DCT1<T>>>,
dct2_cache: HashMap<usize, Arc<DCT2<T>>>,
dct3_cache: HashMap<usize, Arc<DCT3<T>>>,
dct4_cache: HashMap<usize, Arc<DCT4<T>>>,
mdct_cache: HashMap<usize, Arc<MDCT<T>>>,
imdct_cache: HashMap<usize, Arc<IMDCT<T>>>,
}
impl<T: common::DCTnum> DCTplanner<T> {
pub fn new() -> Self {
Self {
fft_planner: FFTplanner::new(false),
dct1_cache: HashMap::new(),
dct2_cache: HashMap::new(),
dct3_cache: HashMap::new(),
dct4_cache: HashMap::new(),
mdct_cache: HashMap::new(),
imdct_cache: HashMap::new(),
}
}
pub fn plan_dct1(&mut self, len: usize) -> Arc<DCT1<T>> {
if self.dct1_cache.contains_key(&len) {
Arc::clone(self.dct1_cache.get(&len).unwrap())
} else {
let result = self.plan_new_dct1(len);
self.dct1_cache.insert(len, Arc::clone(&result));
result
}
}
fn plan_new_dct1(&mut self, len: usize) -> Arc<DCT1<T>> {
if len < 25 {
Arc::new(DCT1Naive::new(len))
} else {
let fft = self.fft_planner.plan_fft((len - 1) * 2);
Arc::new(DCT1ViaFFT::new(fft))
}
}
pub fn plan_dct2(&mut self, len: usize) -> Arc<DCT2<T>> {
if self.dct2_cache.contains_key(&len) {
Arc::clone(self.dct2_cache.get(&len).unwrap())
} else {
let result = self.plan_new_dct2(len);
self.dct2_cache.insert(len, Arc::clone(&result));
result
}
}
fn plan_new_dct2(&mut self, len: usize) -> Arc<DCT2<T>> {
if DCT2_BUTTERFLIES.contains(&len) {
self.plan_dct2_butterfly(len)
} else if len.is_power_of_two() && len > 2 {
let half_dct = self.plan_dct2(len / 2);
let quarter_dct = self.plan_dct2(len / 4);
Arc::new(DCT2SplitRadix::new(half_dct, quarter_dct)) as Arc<DCT2<T>>
} else if len < 16 {
Arc::new(DCT2Naive::new(len))
} else {
let fft = self.fft_planner.plan_fft(len);
Arc::new(DCT2ViaFFT::new(fft))
}
}
fn plan_dct2_butterfly(&mut self, len: usize) -> Arc<DCT2<T>> {
match len {
2 => Arc::new(DCT2Butterfly2::new()),
4 => Arc::new(DCT2Butterfly4::new()),
8 => Arc::new(DCT2Butterfly8::new()),
16 => Arc::new(DCT2Butterfly16::new()),
_ => panic!("Invalid butterfly size for DCT2: {}", len)
}
}
pub fn plan_dct3(&mut self, len: usize) -> Arc<DCT3<T>> {
if self.dct3_cache.contains_key(&len) {
Arc::clone(self.dct3_cache.get(&len).unwrap())
} else {
let result = self.plan_new_dct3(len);
self.dct3_cache.insert(len, Arc::clone(&result));
result
}
}
fn plan_new_dct3(&mut self, len: usize) -> Arc<DCT3<T>> {
if DCT3_BUTTERFLIES.contains(&len) {
self.plan_dct3_butterfly(len)
} else if len.is_power_of_two() && len > 2 {
let half_dct = self.plan_dct3(len / 2);
let quarter_dct = self.plan_dct3(len / 4);
Arc::new(DCT3SplitRadix::new(half_dct, quarter_dct)) as Arc<DCT3<T>>
} else if len < 16 {
Arc::new(DCT3Naive::new(len))
} else {
let fft = self.fft_planner.plan_fft(len);
Arc::new(DCT3ViaFFT::new(fft))
}
}
fn plan_dct3_butterfly(&mut self, len: usize) -> Arc<DCT3<T>> {
match len {
2 => Arc::new(DCT3Butterfly2::new()),
4 => Arc::new(DCT3Butterfly4::new()),
8 => Arc::new(DCT3Butterfly8::new()),
16 => Arc::new(DCT3Butterfly16::new()),
_ => panic!("Invalid butterfly size for DCT3: {}", len)
}
}
pub fn plan_dct4(&mut self, len: usize) -> Arc<DCT4<T>> {
if self.dct4_cache.contains_key(&len) {
Arc::clone(self.dct4_cache.get(&len).unwrap())
} else {
let result = self.plan_new_dct4(len);
self.dct4_cache.insert(len, Arc::clone(&result));
result
}
}
pub fn plan_new_dct4(&mut self, len: usize) -> Arc<DCT4<T>> {
if len % 2 == 0 {
if len < 6 {
Arc::new(DCT4Naive::new(len))
} else {
let inner_dct = self.plan_dct3(len / 2);
Arc::new(DCT4ViaDCT3::new(inner_dct))
}
} else {
if len < 7 {
Arc::new(DCT4Naive::new(len))
} else {
let fft = self.fft_planner.plan_fft(len);
Arc::new(DCT4ViaFFTOdd::new(fft))
}
}
}
pub fn plan_mdct<F>(&mut self, len: usize, window_fn: F) -> Arc<MDCT<T>>
where F: (FnOnce(usize) -> Vec<T>) {
if self.mdct_cache.contains_key(&len) {
Arc::clone(self.mdct_cache.get(&len).unwrap())
} else {
let result = self.plan_new_mdct(len, window_fn);
self.mdct_cache.insert(len, Arc::clone(&result));
result
}
}
pub fn plan_new_mdct<F>(&mut self, len: usize, window_fn: F) -> Arc<MDCT<T>>
where F: (FnOnce(usize) -> Vec<T>) {
let inner_dct4 = self.plan_dct4(len);
Arc::new(MDCTViaDCT4::new(inner_dct4, window_fn))
}
pub fn plan_imdct<F>(&mut self, len: usize, window_fn: F) -> Arc<IMDCT<T>>
where F: (FnOnce(usize) -> Vec<T>) {
if self.imdct_cache.contains_key(&len) {
Arc::clone(self.imdct_cache.get(&len).unwrap())
} else {
let result = self.plan_new_imdct(len, window_fn);
self.imdct_cache.insert(len, Arc::clone(&result));
result
}
}
pub fn plan_new_imdct<F>(&mut self, len: usize, window_fn: F) -> Arc<IMDCT<T>>
where F: (FnOnce(usize) -> Vec<T>) {
let inner_dct4 = self.plan_dct4(len);
Arc::new(IMDCTViaDCT4::new(inner_dct4, window_fn))
}
}