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less underrun

This commit is contained in:
lifning 2021-12-18 00:30:11 -08:00
parent 08e69a3062
commit 74f8a948e5
1 changed files with 18 additions and 16 deletions
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34
ferretro_components/src/provided/sdl2/audio_thread.rs
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@ -1,7 +1,6 @@
use crate::prelude::*;
use std::path::Path;
use std::time::Duration;
use sdl2::Sdl;
use sdl2::audio::{AudioCallback, AudioDevice, AudioSpecDesired};
@ -17,7 +16,6 @@ pub struct SimpleSdl2AudioThreadComponent {
struct MySdlAudio {
must_resample: bool,
reader: Consumer<i16>,
timing: SystemTiming,
}
impl AudioCallback for MySdlAudio {
@ -28,17 +26,20 @@ impl AudioCallback for MySdlAudio {
todo!("correct software resampling")
}
let buf_len = data.len();
let mut remaining = buf_len;
let mut dead_frames = 0;
while remaining > 0 {
let read = self.reader.pop_slice(&mut data[buf_len - remaining..]);
remaining -= read;
if read == 0 {
std::thread::sleep(Duration::from_secs_f64(1.0 / self.timing.fps));
dead_frames += 1;
if dead_frames > self.timing.fps as usize / 2 {
break;
let mut filled = self.reader.pop_slice(data);
filled += self.reader.pop_slice(&mut data[filled..]);
if filled == 0 {
data.fill(0);
} else {
while filled < buf_len {
let remaining = buf_len - filled;
if remaining < filled {
data.copy_within(..remaining, filled);
} else {
data.copy_within(..filled, filled);
}
filled *= 2;
}
}
}
@ -81,14 +82,16 @@ impl SimpleSdl2AudioThreadComponent {
}
fn new_device_from_timing(audio: &sdl2::AudioSubsystem, timing: &SystemTiming) -> crate::base::Result<(AudioDevice<MySdlAudio>, Producer<i16>)> {
const CHANNELS: usize = 2;
const BUF_FRAMES: usize = 4;
let samples_per_frame = timing.sample_rate / timing.fps;
let buf_len = samples_per_frame.ceil() as usize * 4;
let buf_len = samples_per_frame.ceil() as usize * CHANNELS * BUF_FRAMES * 2;
let (writer, reader) = RingBuffer::new(buf_len).split();
let desired_spec = AudioSpecDesired {
freq: Some(timing.sample_rate.round() as i32),
channels: Some(2),
samples: Some((samples_per_frame.ceil() * 1.0) as u16),
channels: Some(CHANNELS as u8),
samples: Some(samples_per_frame.ceil() as u16 * BUF_FRAMES as u16),
};
let device = audio.open_playback(
@ -99,7 +102,6 @@ impl SimpleSdl2AudioThreadComponent {
MySdlAudio {
must_resample, // todo: include freqs from & to
reader,
timing: timing.clone(),
}
})?;
device.resume();