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main: Work around visense kernel channel swap bug

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This is ugly and we really should figure out why the kernel admac stuff
borks, but it'll do for now...

Signed-off-by: Hector Martin <marcan@marcan.st>
This commit is contained in:
Hector Martin 2023-12-17 17:12:55 +09:00
parent 4bbda81f68
commit ea4a8e9d35
1 changed files with 24 additions and 11 deletions
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35
src/main.rs
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@ -210,9 +210,9 @@ fn main() {
let pcm_name = format!("{},{}", device, globals.visense_pcm); let pcm_name = format!("{},{}", device, globals.visense_pcm);
// Set up PCM to buffer in V/ISENSE // Set up PCM to buffer in V/ISENSE
let pcm: alsa::pcm::PCM = let mut pcm: Option<alsa::pcm::PCM> =
helpers::open_pcm(&pcm_name, globals.channels.try_into().unwrap(), 0); Some(helpers::open_pcm(&pcm_name, globals.channels.try_into().unwrap(), 0));
let io = pcm.io_i16().unwrap(); let mut io = Some(pcm.as_ref().unwrap().io_i16().unwrap());
let mut sample_rate_elem = types::Elem::new( let mut sample_rate_elem = types::Elem::new(
"Speaker Sample Rate".to_string(), "Speaker Sample Rate".to_string(),
@ -253,14 +253,19 @@ fn main() {
panic!("SIGQUIT received"); panic!("SIGQUIT received");
} }
// Block while we're reading into the buffer // Block while we're reading into the buffer
let read = io let read = io.as_ref().unwrap().readi(&mut buf);
.readi(&mut buf)
.or_else(|e| { #[allow(unused_mut)]
#[allow(unused_assignments)]
let read = match read {
Ok(a) => Ok(a),
Err(e) => {
if sigquit.load(Ordering::Relaxed) { if sigquit.load(Ordering::Relaxed) {
panic!("SIGQUIT received"); panic!("SIGQUIT received");
} }
if e.errno() == Errno::ESTRPIPE { if e.errno() == Errno::ESTRPIPE {
warn!("Suspend detected!"); warn!("Suspend detected!");
/*
// Resume handling // Resume handling
loop { loop {
match pcm.resume() { match pcm.resume() {
@ -271,12 +276,20 @@ fn main() {
} }
.unwrap(); .unwrap();
warn!("Resume successful"); warn!("Resume successful");
io.readi(&mut buf) */
} else { // Work around kernel issue: resume sometimes breaks visense
Err(e) warn!("Reinitializing PCM to work around kernel bug...");
io = None;
pcm = None;
pcm = Some(helpers::open_pcm(&pcm_name, globals.channels.try_into().unwrap(), 0));
io = Some(pcm.as_ref().unwrap().io_i16().unwrap());
continue;
} }
}) Err(e)
.unwrap(); }
}
.unwrap();
if read != globals.period { if read != globals.period {
warn!("Expected {} samples, got {}", globals.period, read); warn!("Expected {} samples, got {}", globals.period, read);
} }