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Calls to a single ALSA channel are not thread safe

This commit is contained in:
Pierre Krieger 2015-06-24 15:17:52 +02:00
parent f7c99ef3c8
commit b813aa168a
1 changed files with 13 additions and 7 deletions
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20
src/alsa/mod.rs
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@ -2,9 +2,10 @@ extern crate alsa_sys as alsa;
extern crate libc;
use std::{ffi, iter, mem};
use std::sync::Mutex;
pub struct Voice {
channel: *mut alsa::snd_pcm_t,
channel: Mutex<*mut alsa::snd_pcm_t>,
num_channels: u16,
}
@ -34,7 +35,7 @@ impl Voice {
check_errors(alsa::snd_pcm_prepare(playback_handle)).unwrap();
Voice {
channel: playback_handle,
channel: Mutex::new(playback_handle),
num_channels: 2,
}
}
@ -53,8 +54,11 @@ impl Voice {
}
pub fn append_data<'a, T>(&'a mut self, max_elements: usize) -> Buffer<'a, T> where T: Clone {
let available = unsafe { alsa::snd_pcm_avail(self.channel) };
let available = available * self.num_channels as alsa::snd_pcm_sframes_t;
let available = {
let channel = self.channel.lock().unwrap();
let available = unsafe { alsa::snd_pcm_avail(*channel) };
available * self.num_channels as alsa::snd_pcm_sframes_t
};
let elements = ::std::cmp::min(available as usize, max_elements);
@ -80,7 +84,7 @@ unsafe impl Sync for Voice {}
impl Drop for Voice {
fn drop(&mut self) {
unsafe {
alsa::snd_pcm_close(self.channel);
alsa::snd_pcm_close(*self.channel.lock().unwrap());
}
}
}
@ -91,10 +95,12 @@ impl<'a, T> Buffer<'a, T> {
}
pub fn finish(self) {
let written = (self.buffer.len() / self.channel.num_channels as usize) as alsa::snd_pcm_uframes_t;
let written = (self.buffer.len() / self.channel.num_channels as usize)
as alsa::snd_pcm_uframes_t;
let channel = self.channel.channel.lock().unwrap();
unsafe {
let result = alsa::snd_pcm_writei(self.channel.channel,
let result = alsa::snd_pcm_writei(*channel,
self.buffer.as_ptr() as *const libc::c_void,
written);