79 lines
2.1 KiB
Rust
79 lines
2.1 KiB
Rust
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use super::alsa;
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use super::check_errors;
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use super::Endpoint;
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use std::ffi::CStr;
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use std::mem;
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/// ALSA implementation for `EndpointsIterator`.
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pub struct EndpointsIterator {
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// we keep the original list so that we can pass it to the free function
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global_list: *const *const u8,
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// pointer to the next string ; contained within `global_list`
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next_str: *const *const u8,
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}
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unsafe impl Send for EndpointsIterator {}
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unsafe impl Sync for EndpointsIterator {}
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impl Drop for EndpointsIterator {
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fn drop(&mut self) {
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unsafe {
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alsa::snd_device_name_free_hint(self.global_list as *mut _);
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}
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}
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}
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impl Default for EndpointsIterator {
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fn default() -> EndpointsIterator {
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unsafe {
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let mut hints = mem::uninitialized();
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// TODO: check in which situation this can fail
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check_errors(alsa::snd_device_name_hint(-1, b"pcm\0".as_ptr() as *const _,
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&mut hints)).unwrap();
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let hints = hints as *const *const u8;
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EndpointsIterator {
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global_list: hints,
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next_str: hints,
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}
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}
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}
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}
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impl Iterator for EndpointsIterator {
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type Item = Endpoint;
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fn next(&mut self) -> Option<Endpoint> {
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loop {
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unsafe {
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if (*self.next_str).is_null() {
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return None;
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}
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let name = alsa::snd_device_name_get_hint(*self.next_str as *const _,
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b"NAME".as_ptr() as *const _);
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self.next_str = self.next_str.offset(1);
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if name.is_null() {
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continue;
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}
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let name = CStr::from_ptr(name).to_bytes().to_vec();
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let name = String::from_utf8(name).unwrap();
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if name != "null" {
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return Some(Endpoint(name));
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}
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}
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}
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}
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}
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pub fn get_default_endpoint() -> Option<Endpoint> {
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// TODO: do in a different way?
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Some(Endpoint("default".to_owned()))
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}
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