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fix audio in gpSP (sample rate too high after fixed-point conversion)

This commit is contained in:
lifning 2021-12-09 23:40:38 -08:00
parent d74f625c62
commit 904b7c2a41
1 changed files with 17 additions and 11 deletions
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28
ferretro_components/src/provided/sdl2/audio.rs
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@ -69,16 +69,22 @@ impl RetroComponent for SimpleSdl2AudioComponent {
}
fn post_run(&mut self, _retro: &mut LibretroWrapper) -> ControlFlow {
if let Ok(converter) = Self::make_converter(self.src_freq, self.queue.spec()) {
if !self.audio_buffer.is_empty() {
let mut samples = std::mem::take(&mut self.audio_buffer);
samples = resample(&converter, samples);
self.audio_buffer = samples;
self.queue.queue(&self.audio_buffer);
self.audio_buffer.clear();
match Self::make_converter(self.src_freq, self.queue.spec()) {
Ok(converter) => {
if !self.audio_buffer.is_empty() {
let mut samples = std::mem::take(&mut self.audio_buffer);
samples = resample(&converter, samples);
self.audio_buffer = samples;
self.queue.queue(&self.audio_buffer);
self.audio_buffer.clear();
}
ControlFlow::Continue
}
Err(e) => {
eprintln!("Audio sample rate conversion failed: {:?}", e);
ControlFlow::Break
}
}
ControlFlow::Continue
}
}
@ -105,16 +111,16 @@ impl SimpleSdl2AudioComponent {
}
fn make_converter(src_freq: f64, dest_spec: &AudioSpec) -> Result<AudioCVT, String> {
// note on the `* 64`: as long as the ratio between src_rate and dst_rate is right,
// note on the `* 16`: as long as the ratio between src_rate and dst_rate is right,
// we should be in the clear -- this is to make up for SDL not giving us floats for
// this, we can at least get some quasi-fixed-point precision going on...
AudioCVT::new(
AudioFormat::s16_sys(),
2,
(src_freq * 64.0).round() as i32,
(src_freq * 16.0).round() as i32,
dest_spec.format,
dest_spec.channels,
dest_spec.freq * 64,
dest_spec.freq * 16,
)
}
}