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#[cfg(all(feature = "music", not(feature = "32k")))]
use sdl2::audio::AudioCallback;
#[cfg(all(feature = "music", not(feature = "32k")))]
use crate::vendored::micromod::MmC2r;
#[cfg(all(feature = "music", not(feature = "32k")))]
pub struct Music {
pub pcm: Vec<i16>,
pub offset: usize,
}
#[cfg(all(feature = "music", not(feature = "32k")))]
impl AudioCallback for Music {
type Channel = f32;
fn callback(&mut self, out_f: &mut [f32]) {
let len = out_f.len();
let slice = &self.pcm[self.offset..(self.offset + len).min(self.pcm.len() - 1)];
let len = slice.len();
pcm_to_f32pcm(&slice, out_f, len);
self.offset += len;
if self.offset > self.pcm.len() {
self.offset = 0;
}
}
}
#[cfg(all(feature = "music", not(feature = "32k")))]
pub fn mmc2r_to_pcm(state: &mut MmC2r) -> Vec<i16> {
let mut destination = Vec::<i16>::new();
loop {
let mut out = [0; 4096];
if !state.get_audio(&mut out, 2048) {
break;
}
for sample in out {
destination.push(sample);
}
}
// #[cfg(not(feature = "stereo"))]
// let destination = {
// let stereo = destination;
// let mut mono = Vec::<i16>::new();
// let mut is_first_stereo_pair = true;
// let mut stereo_pair_val = 0 as i16;
// for sample in stereo {
// if is_first_stereo_pair {
// stereo_pair_val = sample;
// } else {
// mono.push(((sample as i32 + stereo_pair_val as i32) / 2) as i16);
// }
// is_first_stereo_pair = !is_first_stereo_pair;
// }
// mono
// };
destination
}
#[cfg(all(feature = "music", not(feature = "32k")))]
pub fn pcm_to_f32pcm(input: &[i16], output: &mut [f32], len: usize) {
for i in 0..len {
output[i] = f32::from(input[i]) / f32::from(0x7FFF as i16);
}
}
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