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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,
pub playing: bool,
}
#[cfg(all(feature = "music", not(feature = "32k")))]
impl AudioCallback for Music {
type Channel = f32;
fn callback(&mut self, out_f: &mut [f32]) {
if self.playing {
let len = out_f.len();
let end_of_slice = (self.offset + len).min(self.pcm.len() - 1);
let slice = &self.pcm[self.offset..end_of_slice];
let len = slice.len();
pcm_to_f32pcm(&slice, out_f, len);
self.offset += len;
if end_of_slice == self.pcm.len() - 1 {
self.offset = 0;
#[cfg(not(feature = "loop_music"))]
{
self.playing = false;
}
}
} else {
for i in 0..out_f.len() - 1 {
out_f[i] = 0.0;
}
}
}
}
#[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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