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use crate::alsa;
use std::{fmt, mem, slice};
use super::error::*;
alsa_enum!(
/// [SND_CHMAP_TYPE_xxx](http://www.alsa-project.org/alsa-doc/alsa-lib/group___p_c_m.html) constants
ChmapType, ALL_CHMAP_TYPES[4],
None = SND_CHMAP_TYPE_NONE,
Fixed = SND_CHMAP_TYPE_FIXED,
Var = SND_CHMAP_TYPE_VAR,
Paired = SND_CHMAP_TYPE_PAIRED,
);
alsa_enum!(
ChmapPosition, ALL_CHMAP_POSITIONS[33],
Unknown = SND_CHMAP_UNKNOWN,
NA = SND_CHMAP_NA,
Mono = SND_CHMAP_MONO,
FL = SND_CHMAP_FL,
FR = SND_CHMAP_FR,
RL = SND_CHMAP_RL,
SR = SND_CHMAP_SR,
RC = SND_CHMAP_RC,
FLC = SND_CHMAP_FLC,
FRC = SND_CHMAP_FRC,
RLC = SND_CHMAP_RLC,
RRC = SND_CHMAP_RRC,
FLW = SND_CHMAP_FLW,
FRW = SND_CHMAP_FRW,
FLH = SND_CHMAP_FLH,
FCH = SND_CHMAP_FCH,
FRH = SND_CHMAP_FRH,
TC = SND_CHMAP_TC,
TFL = SND_CHMAP_TFL,
TFR = SND_CHMAP_TFR,
TFC = SND_CHMAP_TFC,
TRL = SND_CHMAP_TRL,
TRR = SND_CHMAP_TRR,
TRC = SND_CHMAP_TRC,
TFLC = SND_CHMAP_TFLC,
TFRC = SND_CHMAP_TFRC,
TSL = SND_CHMAP_TSL,
TSR = SND_CHMAP_TSR,
LLFE = SND_CHMAP_LLFE,
RLFE = SND_CHMAP_RLFE,
BC = SND_CHMAP_BC,
BLC = SND_CHMAP_BLC,
BRC = SND_CHMAP_BRC,
);
impl fmt::Display for ChmapPosition {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let s = unsafe { alsa::snd_pcm_chmap_long_name(*self as libc::c_uint) };
let s = from_const("snd_pcm_chmap_long_name", s)?;
write!(f, "{}", s)
}
}
pub struct Chmap(*mut alsa::snd_pcm_chmap_t, bool);
impl Drop for Chmap {
fn drop(&mut self) { if self.1 { unsafe { libc::free(self.0 as *mut libc::c_void) }}}
}
impl Chmap {
fn set_channels(&mut self, c: libc::c_uint) { unsafe { (*self.0) .channels = c }}
fn as_slice_mut(&mut self) -> &mut [libc::c_uint] {
unsafe { slice::from_raw_parts_mut((*self.0).pos.as_mut_ptr(), (*self.0).channels as usize) }
}
fn as_slice(&self) -> &[libc::c_uint] {
unsafe { slice::from_raw_parts((*self.0).pos.as_ptr(), (*self.0).channels as usize) }
}
}
impl fmt::Display for Chmap {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let mut buf: Vec<libc::c_char> = vec![0; 512];
acheck!(snd_pcm_chmap_print(self.0, buf.len() as libc::size_t, buf.as_mut_ptr()))?;
let s = from_const("snd_pcm_chmap_print", buf.as_mut_ptr())?;
write!(f, "{}", s)
}
}
impl<'a> From<&'a [ChmapPosition]> for Chmap {
fn from(a: &'a [ChmapPosition]) -> Chmap {
let p = unsafe { libc::malloc((mem::size_of::<alsa::snd_pcm_chmap_t>() + mem::size_of::<libc::c_uint>() * a.len()) as libc::size_t) };
if p.is_null() { panic!("Out of memory") }
let mut r = Chmap(p as *mut alsa::snd_pcm_chmap_t, true);
r.set_channels(a.len() as libc::c_uint);
for (i,v) in r.as_slice_mut().iter_mut().enumerate() { *v = a[i] as libc::c_uint }
r
}
}
impl<'a> From<&'a Chmap> for Vec<ChmapPosition> {
fn from(a: &'a Chmap) -> Vec<ChmapPosition> {
a.as_slice().iter().map(|&v| ChmapPosition::from_c_int(v as libc::c_int, "").unwrap()).collect()
}
}
pub fn chmap_new(a: *mut alsa::snd_pcm_chmap_t) -> Chmap { Chmap(a, true) }
pub fn chmap_handle(a: &Chmap) -> *mut alsa::snd_pcm_chmap_t { a.0 }
/// Iterator over available channel maps - see [snd_pcm_chmap_query_t](http://www.alsa-project.org/alsa-doc/alsa-lib/group___p_c_m.html)
pub struct ChmapsQuery(*mut *mut alsa::snd_pcm_chmap_query_t, isize);
impl Drop for ChmapsQuery {
fn drop(&mut self) { unsafe { alsa::snd_pcm_free_chmaps(self.0) }}
}
pub fn chmaps_query_new(a: *mut *mut alsa::snd_pcm_chmap_query_t) -> ChmapsQuery { ChmapsQuery(a, 0) }
impl Iterator for ChmapsQuery {
type Item = (ChmapType, Chmap);
fn next(&mut self) -> Option<Self::Item> {
if self.0.is_null() { return None; }
let p = unsafe { *self.0.offset(self.1) };
if p.is_null() { return None; }
self.1 += 1;
let t = ChmapType::from_c_int(unsafe { (*p).type_ } as libc::c_int, "snd_pcm_query_chmaps").unwrap();
let m = Chmap(unsafe { &mut (*p).map }, false);
Some((t, m))
}
}
#[test]
fn chmap_for_first_pcm() {
use super::*;
use std::ffi::CString;
use crate::device_name::HintIter;
let i = HintIter::new(None, &*CString::new("pcm").unwrap()).unwrap();
for p in i.map(|n| n.name.unwrap()) {
println!("Chmaps for {:?}:", p);
match PCM::open(&CString::new(p).unwrap(), Direction::Playback, false) {
Ok(a) => for c in a.query_chmaps() {
println!(" {:?}, {}", c.0, c.1);
},
Err(a) => println!(" {}", a) // It's okay to have entries in the name hint array that can't be opened
}
}
}