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Automatically select the sample rate if zero

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This allows the sense PCM to be opened at the correct current rate if
playback is active, or otherwise arbitrarily picks the lowest rate.

Signed-off-by: Hector Martin <marcan@marcan.st>
This commit is contained in:
Hector Martin 2023-05-09 19:12:02 +09:00
parent 21b3e49456
commit 5c47bc3e94
2 changed files with 10 additions and 3 deletions
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10
src/helpers.rs
View file

@ -40,11 +40,19 @@ pub fn open_card(card: &str) -> alsa::ctl::Ctl {
return ctldev;
}
pub fn open_pcm(dev: &str, chans: u32, sample_rate: u32) -> alsa::pcm::PCM {
pub fn open_pcm(dev: &str, chans: u32, mut sample_rate: u32) -> alsa::pcm::PCM {
let pcm = alsa::pcm::PCM::new(dev, alsa::Direction::Capture, false).unwrap();
{
let params = alsa::pcm::HwParams::any(&pcm).unwrap();
let rate_max = params.get_rate_max().unwrap();
let rate_min = params.get_rate_min().unwrap();
println!("PCM rate: {}..{}", rate_min, rate_max);
if sample_rate == 0 {
sample_rate = rate_min;
}
params.set_channels(chans).unwrap();
params
.set_rate(sample_rate, alsa::ValueOr::Nearest)

3
src/main.rs
View file

@ -137,8 +137,7 @@ fn main() {
let pcm_name = format!("{},{}", device, globals.visense_pcm);
// Set up PCM to buffer in V/ISENSE
let pcm: alsa::pcm::PCM =
helpers::open_pcm(&pcm_name, globals.channels.try_into().unwrap(), 48000);
let pcm: alsa::pcm::PCM = helpers::open_pcm(&pcm_name, globals.channels.try_into().unwrap(), 0);
let mut buf = Vec::new();
buf.resize(globals.period * globals.channels, 0i16);