1use crate::alsa;
2use super::error::*;
3use std::{slice, ptr, fmt};
4
5/// [snd_output_t](http://www.alsa-project.org/alsa-doc/alsa-lib/group___output.html) wrapper
6pub struct Output(*mut alsa::snd_output_t);
7
8unsafe impl Send for Output {}
9
10impl Drop for Output {
11 fn drop(&mut self) { unsafe { alsa::snd_output_close(self.0) }; }
12}
13
14impl Output {
15
16 pub fn buffer_open() -> Result<Output> {
17 let mut q: *mut _snd_output = ptr::null_mut();
18 acheck!(snd_output_buffer_open(&mut q)).map(|_| Output(q))
19 }
20
21 pub fn buffer_string<T, F: FnOnce(&[u8]) -> T>(&self, f: F) -> T {
22 let b: &[u8] = unsafe {
23 let mut q: *mut u8 = ptr::null_mut();
24 let s: usize = alsa::snd_output_buffer_string(self.0, &mut q);
25 slice::from_raw_parts(data:q as *const u8, len:s as usize)
26 };
27 f(b)
28 }
29}
30
31impl fmt::Debug for Output {
32 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
33 write!(f, "Output(")?;
34 fmt::Display::fmt(self, f)?;
35 write!(f, ")")
36 /* self.buffer_string(|b| f.write_str(try!(str::from_utf8(b).map_err(|_| fmt::Error)))) */
37 }
38}
39
40impl fmt::Display for Output {
41 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
42 self.buffer_string(|b: &[u8]| {
43 let s: Cow<'_, str> = String::from_utf8_lossy(b);
44 f.write_str(&*s)
45 })
46 }
47}
48
49pub fn output_handle(o: &Output) -> *mut alsa::snd_output_t { o.0 }
50