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add system for micro adjustments to audio pitch

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This commit is contained in:
Logan McNaughton
2026-01-20 19:10:55 +01:00
parent befbacc5b3
commit 367c22877b
1 changed files with 44 additions and 8 deletions
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src/ui/audio.rs
+44 -8
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@@ -65,6 +65,27 @@ pub fn raise_audio_volume(ui: &mut ui::Ui) {
}
}
fn adjust_audio_frequency(device: &device::Device, frequency: f32) {
if !device.vi.enable_speed_limiter {
return;
}
unsafe {
let current_ratio =
sdl3_sys::everything::SDL_GetAudioStreamFrequencyRatio(device.ui.audio.audio_stream);
sdl3_sys::everything::SDL_SetAudioStreamFrequencyRatio(
device.ui.audio.audio_stream,
(current_ratio + frequency).clamp(0.99, 1.01),
);
/*
println!(
"Adjusted audio frequency ratio to {}",
sdl3_sys::everything::SDL_GetAudioStreamFrequencyRatio(device.ui.audio.audio_stream)
);
*/
}
}
pub fn play_audio(device: &device::Device, dram_addr: usize, length: u64) {
if device.ui.audio.audio_stream.is_null() {
return;
@@ -85,11 +106,11 @@ pub fn play_audio(device: &device::Device, dram_addr: usize, length: u64) {
let audio_queued =
unsafe { sdl3_sys::audio::SDL_GetAudioStreamQueued(device.ui.audio.audio_stream) } as f64;
let min_latency = device.ai.freq as f64 * device.vi.frame_time * 4.0;
let acceptable_latency = min_latency * 8.0;
let samples_per_frame = device.ai.freq as f64 * device.vi.frame_time * 4.0;
let max_latency = samples_per_frame * 10.0;
if audio_queued < min_latency {
let silence_buffer: Vec<u8> = vec![0; min_latency as usize & !3];
if audio_queued < samples_per_frame {
let silence_buffer: Vec<u8> = vec![0; samples_per_frame as usize & !3];
if !unsafe {
sdl3_sys::audio::SDL_PutAudioStreamData(
device.ui.audio.audio_stream,
@@ -99,17 +120,32 @@ pub fn play_audio(device: &device::Device, dram_addr: usize, length: u64) {
} {
panic!("Could not play audio");
}
/*
println!(
"Audio underrun: queued {} samples, expected at least {} samples",
audio_queued, samples_per_frame
);
*/
adjust_audio_frequency(device, -0.0005);
}
if audio_queued < acceptable_latency
&& !unsafe {
if audio_queued < max_latency {
if !unsafe {
sdl3_sys::audio::SDL_PutAudioStreamData(
device.ui.audio.audio_stream,
primary_buffer.as_ptr() as *const std::ffi::c_void,
primary_buffer.len() as i32 * 2,
)
} {
panic!("Could not play audio");
}
{
panic!("Could not play audio");
} else {
/*
println!(
"Audio overrun: queued {} samples, expected at most {} samples",
audio_queued, max_latency
);
*/
adjust_audio_frequency(device, 0.0005);
}
}