Switch from vendored alsa-sys to alsa crate
This commit is contained in:
Alex Moon
parent
f3e7c46205
commit
62d540d396
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@ -27,8 +27,9 @@ asio-sys = { version = "0.1", path = "asio-sys", optional = true }
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parking_lot = "0.9"
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[target.'cfg(any(target_os = "linux", target_os = "dragonfly", target_os = "freebsd"))'.dependencies]
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alsa-sys = { version = "0.1", path = "alsa-sys" }
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libc = "0.2"
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alsa = "0.4.1"
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nix = "0.15.0"
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libc = "0.2.65"
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[target.'cfg(any(target_os = "macos", target_os = "ios"))'.dependencies]
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coreaudio-rs = { version = "0.9.1", default-features = false, features = ["audio_unit", "core_audio"] }
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@ -1,3 +0,0 @@
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/target
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/Cargo.lock
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.cargo/
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@ -1,14 +0,0 @@
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[package]
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name = "alsa-sys"
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version = "0.1.1"
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authors = ["Pierre Krieger <pierre.krieger1708@gmail.com>"]
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build = "build.rs"
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description = "Bindings for the ALSA project (Advanced Linux Sound Architecture)"
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license = "MIT"
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links = "alsa"
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[dependencies]
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libc = "0.2.7"
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[build-dependencies]
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pkg-config = "0.3"
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@ -1,5 +0,0 @@
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extern crate pkg_config;
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fn main() {
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pkg_config::find_library("alsa").unwrap();
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}
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3777
alsa-sys/src/lib.rs
3777
alsa-sys/src/lib.rs
File diff suppressed because it is too large
Load Diff
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@ -1,95 +1,37 @@
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use super::alsa;
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use super::check_errors;
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use super::Device;
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use std::ffi::CString;
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use std::ptr;
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use {BackendSpecificError, DevicesError};
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/// ALSA implementation for `Devices`.
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pub struct Devices {
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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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hint_iter: alsa::device_name::HintIter,
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}
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impl Devices {
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pub fn new() -> Result<Self, DevicesError> {
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unsafe {
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// TODO: check in which situation this can fail.
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let card = -1; // -1 means all cards.
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let iface = b"pcm\0"; // Interface identification.
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let mut hints = ptr::null_mut(); // Array of device name hints.
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let res = alsa::snd_device_name_hint(card, iface.as_ptr() as *const _, &mut hints);
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if let Err(description) = check_errors(res) {
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let err = BackendSpecificError { description };
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return Err(err.into());
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}
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let hints = hints as *const *const u8;
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let devices = Devices {
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global_list: hints,
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next_str: hints,
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};
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Ok(devices)
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}
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Ok(Devices {
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hint_iter: alsa::device_name::HintIter::new_str(None, "pcm")?,
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})
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}
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}
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unsafe impl Send for Devices {}
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unsafe impl Sync for Devices {}
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impl Drop for Devices {
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#[inline]
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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 Iterator for Devices {
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type Item = Device;
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fn next(&mut self) -> Option<Device> {
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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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match self.hint_iter.next() {
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None => return None,
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Some(hint) => {
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let name = hint.name;
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let name = {
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let n_ptr = alsa::snd_device_name_get_hint(
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*self.next_str as *const _,
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b"NAME\0".as_ptr() as *const _,
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);
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if !n_ptr.is_null() {
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let bytes = CString::from_raw(n_ptr).into_bytes();
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let string = String::from_utf8(bytes).unwrap();
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Some(string)
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} else {
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None
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}
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};
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let io = {
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let n_ptr = alsa::snd_device_name_get_hint(
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*self.next_str as *const _,
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b"IOID\0".as_ptr() as *const _,
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);
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if !n_ptr.is_null() {
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let bytes = CString::from_raw(n_ptr).into_bytes();
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let string = String::from_utf8(bytes).unwrap();
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Some(string)
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} else {
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None
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}
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};
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self.next_str = self.next_str.offset(1);
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let io = hint.direction;
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if let Some(io) = io {
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if io != "Output" {
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if io != alsa::Direction::Playback {
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continue;
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}
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}
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@ -105,32 +47,17 @@ impl Iterator for Devices {
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_ => continue,
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};
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// trying to open the PCM device to see if it can be opened
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let name_zeroed = CString::new(&name[..]).unwrap();
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// See if the device has an available output stream.
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let mut playback_handle = ptr::null_mut();
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let has_available_output = alsa::snd_pcm_open(
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&mut playback_handle,
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name_zeroed.as_ptr() as *const _,
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alsa::SND_PCM_STREAM_PLAYBACK,
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alsa::SND_PCM_NONBLOCK,
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) == 0;
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if has_available_output {
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alsa::snd_pcm_close(playback_handle);
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}
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let has_available_output = {
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let playback_handle = alsa::pcm::PCM::new(&name, alsa::Direction::Playback, true);
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playback_handle.is_ok()
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};
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// See if the device has an available input stream.
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let mut capture_handle = ptr::null_mut();
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let has_available_input = alsa::snd_pcm_open(
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&mut capture_handle,
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name_zeroed.as_ptr() as *const _,
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alsa::SND_PCM_STREAM_CAPTURE,
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alsa::SND_PCM_NONBLOCK,
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) == 0;
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if has_available_input {
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alsa::snd_pcm_close(capture_handle);
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}
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let has_available_input = {
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let capture_handle = alsa::pcm::PCM::new(&name, alsa::Direction::Capture, true);
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capture_handle.is_ok()
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};
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if has_available_output || has_available_input {
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return Some(Device(name));
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@ -139,6 +66,7 @@ impl Iterator for Devices {
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}
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}
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}
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}
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#[inline]
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pub fn default_input_device() -> Option<Device> {
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@ -149,3 +77,10 @@ pub fn default_input_device() -> Option<Device> {
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pub fn default_output_device() -> Option<Device> {
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Some(Device("default".to_owned()))
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}
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impl From<alsa::Error> for DevicesError {
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fn from(err: alsa::Error) -> Self {
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let err: BackendSpecificError = err.into();
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err.into()
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}
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}
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@ -1,6 +1,7 @@
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extern crate alsa_sys as alsa;
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extern crate alsa;
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extern crate libc;
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use self::alsa::poll::Descriptors;
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use crate::{
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BackendSpecificError, BuildStreamError, ChannelCount, Data, DefaultStreamConfigError,
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DeviceNameError, DevicesError, PauseStreamError, PlayStreamError, SampleFormat, SampleRate,
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@ -10,7 +11,7 @@ use crate::{
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use std::sync::Arc;
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use std::thread::{self, JoinHandle};
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use std::vec::IntoIter as VecIntoIter;
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use std::{cmp, ffi, io, ptr};
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use std::cmp;
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use traits::{DeviceTrait, HostTrait, StreamTrait};
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pub use self::enumerate::{default_input_device, default_output_device, Devices};
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@ -93,7 +94,7 @@ impl DeviceTrait for Device {
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E: FnMut(StreamError) + Send + 'static,
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{
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let stream_inner =
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self.build_stream_inner(conf, sample_format, alsa::SND_PCM_STREAM_CAPTURE)?;
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self.build_stream_inner(conf, sample_format, alsa::Direction::Capture)?;
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let stream = Stream::new_input(Arc::new(stream_inner), data_callback, error_callback);
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Ok(stream)
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}
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@ -110,7 +111,7 @@ impl DeviceTrait for Device {
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E: FnMut(StreamError) + Send + 'static,
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{
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let stream_inner =
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self.build_stream_inner(conf, sample_format, alsa::SND_PCM_STREAM_PLAYBACK)?;
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self.build_stream_inner(conf, sample_format, alsa::Direction::Playback)?;
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let stream = Stream::new_output(Arc::new(stream_inner), data_callback, error_callback);
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Ok(stream)
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}
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@ -168,55 +169,40 @@ impl Device {
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&self,
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conf: &StreamConfig,
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sample_format: SampleFormat,
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stream_type: alsa::snd_pcm_stream_t,
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stream_type: alsa::Direction,
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) -> Result<StreamInner, BuildStreamError> {
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let name = ffi::CString::new(self.0.clone()).expect("unable to clone device");
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let name = &self.0;
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let handle = unsafe {
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let mut handle = ptr::null_mut();
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match alsa::snd_pcm_open(
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&mut handle,
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name.as_ptr(),
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stream_type,
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alsa::SND_PCM_NONBLOCK,
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) {
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-16 /* determined empirically */ => return Err(BuildStreamError::DeviceNotAvailable),
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-22 => return Err(BuildStreamError::InvalidArgument),
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e => if let Err(description) = check_errors(e) {
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let err = BackendSpecificError { description };
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return Err(err.into());
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let handle = match alsa::pcm::PCM::new(name, stream_type, true).map_err(|e| (e, e.errno())) {
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Err((_, Some(nix::errno::Errno::EBUSY))) => {
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return Err(BuildStreamError::DeviceNotAvailable)
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}
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Err((_, Some(nix::errno::Errno::EINVAL))) => {
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return Err(BuildStreamError::InvalidArgument)
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}
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handle
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Err((e, _)) => return Err(e.into()),
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Ok(handle) => handle,
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};
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let can_pause = unsafe {
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let hw_params = HwParams::alloc();
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set_hw_params_from_format(handle, &hw_params, conf, sample_format)
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.map_err(|description| BackendSpecificError { description })?;
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let can_pause = {
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let hw_params = set_hw_params_from_format(&handle, conf, sample_format)?;
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hw_params.can_pause()
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};
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let (buffer_len, period_len) = set_sw_params_from_format(&handle, conf)?;
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alsa::snd_pcm_hw_params_can_pause(hw_params.0) == 1
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};
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let (buffer_len, period_len) = unsafe {
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set_sw_params_from_format(handle, conf)
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.map_err(|description| BackendSpecificError { description })?
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};
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if let Err(desc) = check_errors(unsafe { alsa::snd_pcm_prepare(handle) }) {
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let description = format!("could not get handle: {}", desc);
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let err = BackendSpecificError { description };
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return Err(err.into());
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}
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handle.prepare()?;
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let num_descriptors = {
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let num_descriptors = unsafe { alsa::snd_pcm_poll_descriptors_count(handle) };
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let num_descriptors = handle.count();
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if num_descriptors == 0 {
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let description = "poll descriptor count for stream was 0".to_string();
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let err = BackendSpecificError { description };
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return Err(err.into());
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}
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num_descriptors as usize
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num_descriptors
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};
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handle.start()?;
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let stream_inner = StreamInner {
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channel: handle,
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sample_format,
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@ -227,12 +213,6 @@ impl Device {
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can_pause,
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};
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if let Err(desc) = check_errors(unsafe { alsa::snd_pcm_start(handle) }) {
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let description = format!("could not start stream: {}", desc);
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let err = BackendSpecificError { description };
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return Err(err.into());
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}
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Ok(stream_inner)
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}
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@ -241,51 +221,33 @@ impl Device {
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Ok(self.0.clone())
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}
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unsafe fn supported_configs(
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fn supported_configs(
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&self,
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stream_t: alsa::snd_pcm_stream_t,
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stream_t: alsa::Direction,
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) -> Result<VecIntoIter<SupportedStreamConfigRange>, SupportedStreamConfigsError> {
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let mut handle = ptr::null_mut();
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let device_name = match ffi::CString::new(&self.0[..]) {
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Ok(name) => name,
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Err(err) => {
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let description = format!("failed to retrieve device name: {}", err);
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let err = BackendSpecificError { description };
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return Err(err.into());
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let name = &self.0;
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let handle = match alsa::pcm::PCM::new(name, stream_t, true).map_err(|e| (e, e.errno())) {
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Err((_, Some(nix::errno::Errno::ENOENT)))
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| Err((_, Some(nix::errno::Errno::EBUSY))) => {
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return Err(SupportedStreamConfigsError::DeviceNotAvailable)
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}
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Err((_, Some(nix::errno::Errno::EINVAL))) => {
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return Err(SupportedStreamConfigsError::InvalidArgument)
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}
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Err((e, _)) => return Err(e.into()),
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Ok(handle) => handle,
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};
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match alsa::snd_pcm_open(
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&mut handle,
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device_name.as_ptr() as *const _,
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stream_t,
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alsa::SND_PCM_NONBLOCK,
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) {
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-2 |
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-16 /* determined empirically */ => return Err(SupportedStreamConfigsError::DeviceNotAvailable),
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-22 => return Err(SupportedStreamConfigsError::InvalidArgument),
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e => if let Err(description) = check_errors(e) {
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let err = BackendSpecificError { description };
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return Err(err.into())
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}
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}
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let hw_params = HwParams::alloc();
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match check_errors(alsa::snd_pcm_hw_params_any(handle, hw_params.0)) {
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Err(description) => {
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let err = BackendSpecificError { description };
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return Err(err.into());
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}
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Ok(_) => (),
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};
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let hw_params = alsa::pcm::HwParams::any(&handle)?;
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// TODO: check endianess
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const FORMATS: [(SampleFormat, alsa::snd_pcm_format_t); 3] = [
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const FORMATS: [(SampleFormat, alsa::pcm::Format); 3] = [
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//SND_PCM_FORMAT_S8,
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//SND_PCM_FORMAT_U8,
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(SampleFormat::I16, alsa::SND_PCM_FORMAT_S16_LE),
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(SampleFormat::I16, alsa::pcm::Format::S16LE),
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//SND_PCM_FORMAT_S16_BE,
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(SampleFormat::U16, alsa::SND_PCM_FORMAT_U16_LE),
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(SampleFormat::U16, alsa::pcm::Format::U16LE),
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//SND_PCM_FORMAT_U16_BE,
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//SND_PCM_FORMAT_S24_LE,
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//SND_PCM_FORMAT_S24_BE,
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@ -295,7 +257,7 @@ impl Device {
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//SND_PCM_FORMAT_S32_BE,
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//SND_PCM_FORMAT_U32_LE,
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//SND_PCM_FORMAT_U32_BE,
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(SampleFormat::F32, alsa::SND_PCM_FORMAT_FLOAT_LE),
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(SampleFormat::F32, alsa::pcm::Format::FloatLE),
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//SND_PCM_FORMAT_FLOAT_BE,
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//SND_PCM_FORMAT_FLOAT64_LE,
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//SND_PCM_FORMAT_FLOAT64_BE,
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@ -323,36 +285,15 @@ impl Device {
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let mut supported_formats = Vec::new();
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for &(sample_format, alsa_format) in FORMATS.iter() {
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if alsa::snd_pcm_hw_params_test_format(handle, hw_params.0, alsa_format) == 0 {
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if hw_params.test_format(alsa_format).is_ok() {
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supported_formats.push(sample_format);
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}
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}
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let mut min_rate = 0;
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if let Err(desc) = check_errors(alsa::snd_pcm_hw_params_get_rate_min(
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hw_params.0,
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&mut min_rate,
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ptr::null_mut(),
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)) {
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let description = format!("unable to get minimum supported rate: {}", desc);
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let err = BackendSpecificError { description };
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return Err(err.into());
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}
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let min_rate = hw_params.get_rate_min()?;
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let max_rate = hw_params.get_rate_max()?;
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let mut max_rate = 0;
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if let Err(desc) = check_errors(alsa::snd_pcm_hw_params_get_rate_max(
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hw_params.0,
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&mut max_rate,
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ptr::null_mut(),
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)) {
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let description = format!("unable to get maximum supported rate: {}", desc);
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let err = BackendSpecificError { description };
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return Err(err.into());
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}
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let sample_rates = if min_rate == max_rate
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|| alsa::snd_pcm_hw_params_test_rate(handle, hw_params.0, min_rate + 1, 0) == 0
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{
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let sample_rates = if min_rate == max_rate || hw_params.test_rate(min_rate + 1).is_ok() {
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vec![(min_rate, max_rate)]
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} else {
|
||||
const RATES: [libc::c_uint; 13] = [
|
||||
|
|
@ -362,7 +303,7 @@ impl Device {
|
|||
|
||||
let mut rates = Vec::new();
|
||||
for &rate in RATES.iter() {
|
||||
if alsa::snd_pcm_hw_params_test_rate(handle, hw_params.0, rate, 0) == 0 {
|
||||
if hw_params.test_rate(rate).is_ok() {
|
||||
rates.push((rate, rate));
|
||||
}
|
||||
}
|
||||
|
|
@ -374,30 +315,13 @@ impl Device {
|
|||
}
|
||||
};
|
||||
|
||||
let mut min_channels = 0;
|
||||
if let Err(desc) = check_errors(alsa::snd_pcm_hw_params_get_channels_min(
|
||||
hw_params.0,
|
||||
&mut min_channels,
|
||||
)) {
|
||||
let description = format!("unable to get minimum supported channel count: {}", desc);
|
||||
let err = BackendSpecificError { description };
|
||||
return Err(err.into());
|
||||
}
|
||||
|
||||
let mut max_channels = 0;
|
||||
if let Err(desc) = check_errors(alsa::snd_pcm_hw_params_get_channels_max(
|
||||
hw_params.0,
|
||||
&mut max_channels,
|
||||
)) {
|
||||
let description = format!("unable to get maximum supported channel count: {}", desc);
|
||||
let err = BackendSpecificError { description };
|
||||
return Err(err.into());
|
||||
}
|
||||
let min_channels = hw_params.get_channels_min()?;
|
||||
let max_channels = hw_params.get_channels_max()?;
|
||||
|
||||
let max_channels = cmp::min(max_channels, 32); // TODO: limiting to 32 channels or too much stuff is returned
|
||||
let supported_channels = (min_channels..max_channels + 1)
|
||||
.filter_map(|num| {
|
||||
if alsa::snd_pcm_hw_params_test_channels(handle, hw_params.0, num) == 0 {
|
||||
if hw_params.test_channels(num).is_ok() {
|
||||
Some(num as ChannelCount)
|
||||
} else {
|
||||
None
|
||||
|
|
@ -421,30 +345,28 @@ impl Device {
|
|||
}
|
||||
}
|
||||
|
||||
// TODO: RAII
|
||||
alsa::snd_pcm_close(handle);
|
||||
Ok(output.into_iter())
|
||||
}
|
||||
|
||||
fn supported_input_configs(
|
||||
&self,
|
||||
) -> Result<SupportedInputConfigs, SupportedStreamConfigsError> {
|
||||
unsafe { self.supported_configs(alsa::SND_PCM_STREAM_CAPTURE) }
|
||||
self.supported_configs(alsa::Direction::Capture)
|
||||
}
|
||||
|
||||
fn supported_output_configs(
|
||||
&self,
|
||||
) -> Result<SupportedOutputConfigs, SupportedStreamConfigsError> {
|
||||
unsafe { self.supported_configs(alsa::SND_PCM_STREAM_PLAYBACK) }
|
||||
self.supported_configs(alsa::Direction::Playback)
|
||||
}
|
||||
|
||||
// ALSA does not offer default stream formats, so instead we compare all supported formats by
|
||||
// the `SupportedStreamConfigRange::cmp_default_heuristics` order and select the greatest.
|
||||
fn default_config(
|
||||
&self,
|
||||
stream_t: alsa::snd_pcm_stream_t,
|
||||
stream_t: alsa::Direction,
|
||||
) -> Result<SupportedStreamConfig, DefaultStreamConfigError> {
|
||||
let mut formats: Vec<_> = unsafe {
|
||||
let mut formats: Vec<_> = {
|
||||
match self.supported_configs(stream_t) {
|
||||
Err(SupportedStreamConfigsError::DeviceNotAvailable) => {
|
||||
return Err(DefaultStreamConfigError::DeviceNotAvailable);
|
||||
|
|
@ -479,17 +401,17 @@ impl Device {
|
|||
}
|
||||
|
||||
fn default_input_config(&self) -> Result<SupportedStreamConfig, DefaultStreamConfigError> {
|
||||
self.default_config(alsa::SND_PCM_STREAM_CAPTURE)
|
||||
self.default_config(alsa::Direction::Capture)
|
||||
}
|
||||
|
||||
fn default_output_config(&self) -> Result<SupportedStreamConfig, DefaultStreamConfigError> {
|
||||
self.default_config(alsa::SND_PCM_STREAM_PLAYBACK)
|
||||
self.default_config(alsa::Direction::Playback)
|
||||
}
|
||||
}
|
||||
|
||||
struct StreamInner {
|
||||
// The ALSA channel.
|
||||
channel: *mut alsa::snd_pcm_t,
|
||||
channel: alsa::pcm::PCM,
|
||||
|
||||
// When converting between file descriptors and `snd_pcm_t`, this is the number of
|
||||
// file descriptors that this `snd_pcm_t` uses.
|
||||
|
|
@ -512,8 +434,6 @@ struct StreamInner {
|
|||
}
|
||||
|
||||
// Assume that the ALSA library is built with thread safe option.
|
||||
unsafe impl Send for StreamInner {}
|
||||
|
||||
unsafe impl Sync for StreamInner {}
|
||||
|
||||
#[derive(Debug, Eq, PartialEq)]
|
||||
|
|
@ -548,11 +468,17 @@ fn input_stream_worker(
|
|||
) {
|
||||
let mut ctxt = StreamWorkerContext::default();
|
||||
loop {
|
||||
match poll_descriptors_and_prepare_buffer(&rx, stream, &mut ctxt, error_callback) {
|
||||
let flow = report_error(
|
||||
poll_descriptors_and_prepare_buffer(&rx, stream, &mut ctxt),
|
||||
error_callback,
|
||||
)
|
||||
.unwrap_or(PollDescriptorsFlow::Continue);
|
||||
|
||||
match flow {
|
||||
PollDescriptorsFlow::Continue => continue,
|
||||
PollDescriptorsFlow::Return => return,
|
||||
PollDescriptorsFlow::Ready {
|
||||
available_frames,
|
||||
available_frames: _,
|
||||
stream_type,
|
||||
} => {
|
||||
assert_eq!(
|
||||
|
|
@ -560,11 +486,8 @@ fn input_stream_worker(
|
|||
StreamType::Input,
|
||||
"expected input stream, but polling descriptors indicated output",
|
||||
);
|
||||
process_input(
|
||||
stream,
|
||||
&mut ctxt.buffer,
|
||||
available_frames,
|
||||
data_callback,
|
||||
report_error(
|
||||
process_input(stream, &mut ctxt.buffer, data_callback),
|
||||
error_callback,
|
||||
);
|
||||
}
|
||||
|
|
@ -580,7 +503,13 @@ fn output_stream_worker(
|
|||
) {
|
||||
let mut ctxt = StreamWorkerContext::default();
|
||||
loop {
|
||||
match poll_descriptors_and_prepare_buffer(&rx, stream, &mut ctxt, error_callback) {
|
||||
let flow = report_error(
|
||||
poll_descriptors_and_prepare_buffer(&rx, stream, &mut ctxt),
|
||||
error_callback,
|
||||
)
|
||||
.unwrap_or(PollDescriptorsFlow::Continue);
|
||||
|
||||
match flow {
|
||||
PollDescriptorsFlow::Continue => continue,
|
||||
PollDescriptorsFlow::Return => return,
|
||||
PollDescriptorsFlow::Ready {
|
||||
|
|
@ -604,6 +533,22 @@ fn output_stream_worker(
|
|||
}
|
||||
}
|
||||
|
||||
fn report_error<T, E>(
|
||||
result: Result<T, E>,
|
||||
error_callback: &mut (dyn FnMut(StreamError) + Send + 'static),
|
||||
) -> Option<T>
|
||||
where
|
||||
E: Into<StreamError>,
|
||||
{
|
||||
match result {
|
||||
Ok(val) => Some(val),
|
||||
Err(err) => {
|
||||
error_callback(err.into());
|
||||
None
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
enum PollDescriptorsFlow {
|
||||
Continue,
|
||||
Return,
|
||||
|
|
@ -618,8 +563,7 @@ fn poll_descriptors_and_prepare_buffer(
|
|||
rx: &TriggerReceiver,
|
||||
stream: &StreamInner,
|
||||
ctxt: &mut StreamWorkerContext,
|
||||
error_callback: &mut (dyn FnMut(StreamError) + Send + 'static),
|
||||
) -> PollDescriptorsFlow {
|
||||
) -> Result<PollDescriptorsFlow, BackendSpecificError> {
|
||||
let StreamWorkerContext {
|
||||
ref mut descriptors,
|
||||
ref mut buffer,
|
||||
|
|
@ -635,68 +579,45 @@ fn poll_descriptors_and_prepare_buffer(
|
|||
});
|
||||
|
||||
// Add ALSA polling fds.
|
||||
descriptors.reserve(stream.num_descriptors);
|
||||
let len = descriptors.len();
|
||||
let filled = unsafe {
|
||||
alsa::snd_pcm_poll_descriptors(
|
||||
stream.channel,
|
||||
descriptors[len..].as_mut_ptr(),
|
||||
stream.num_descriptors as libc::c_uint,
|
||||
)
|
||||
};
|
||||
debug_assert_eq!(filled, stream.num_descriptors as libc::c_int);
|
||||
unsafe {
|
||||
descriptors.set_len(len + stream.num_descriptors);
|
||||
}
|
||||
descriptors.resize(
|
||||
stream.num_descriptors + len,
|
||||
libc::pollfd {
|
||||
fd: 0,
|
||||
events: 0,
|
||||
revents: 0,
|
||||
},
|
||||
);
|
||||
let filled = stream.channel.fill(&mut descriptors[len..])?;
|
||||
debug_assert_eq!(filled, stream.num_descriptors);
|
||||
|
||||
let res = unsafe {
|
||||
// Don't timeout, wait forever.
|
||||
libc::poll(
|
||||
descriptors.as_mut_ptr(),
|
||||
descriptors.len() as libc::nfds_t,
|
||||
-1,
|
||||
)
|
||||
};
|
||||
if res < 0 {
|
||||
let description = format!("`libc::poll()` failed: {}", io::Error::last_os_error());
|
||||
error_callback(BackendSpecificError { description }.into());
|
||||
return PollDescriptorsFlow::Continue;
|
||||
} else if res == 0 {
|
||||
let description = String::from("`libc::poll()` spuriously returned");
|
||||
error_callback(BackendSpecificError { description }.into());
|
||||
return PollDescriptorsFlow::Continue;
|
||||
let res = alsa::poll::poll(descriptors, -1)?;
|
||||
if res == 0 {
|
||||
let description = String::from("`alsa::poll()` spuriously returned");
|
||||
return Err(BackendSpecificError { description });
|
||||
}
|
||||
|
||||
if descriptors[0].revents != 0 {
|
||||
// The stream has been requested to be destroyed.
|
||||
rx.clear_pipe();
|
||||
return PollDescriptorsFlow::Return;
|
||||
return Ok(PollDescriptorsFlow::Return);
|
||||
}
|
||||
|
||||
let stream_type = match check_for_pollout_or_pollin(stream, descriptors[1..].as_mut_ptr()) {
|
||||
Ok(Some(ty)) => ty,
|
||||
Ok(None) => {
|
||||
let stream_type = match stream.channel.revents(&descriptors[1..])? {
|
||||
alsa::poll::Flags::OUT => StreamType::Output,
|
||||
alsa::poll::Flags::IN => StreamType::Input,
|
||||
_ => {
|
||||
// Nothing to process, poll again
|
||||
return PollDescriptorsFlow::Continue;
|
||||
}
|
||||
Err(err) => {
|
||||
error_callback(err.into());
|
||||
return PollDescriptorsFlow::Continue;
|
||||
return Ok(PollDescriptorsFlow::Continue);
|
||||
}
|
||||
};
|
||||
// Get the number of available samples for reading/writing.
|
||||
let available_samples = match get_available_samples(stream) {
|
||||
Ok(n) => n,
|
||||
Err(err) => {
|
||||
let description = format!("Failed to query the number of available samples: {}", err);
|
||||
error_callback(BackendSpecificError { description }.into());
|
||||
return PollDescriptorsFlow::Continue;
|
||||
}
|
||||
};
|
||||
let available_samples = get_available_samples(stream)?;
|
||||
|
||||
// Only go on if there is at least `stream.period_len` samples.
|
||||
if available_samples < stream.period_len {
|
||||
return PollDescriptorsFlow::Continue;
|
||||
return Ok(PollDescriptorsFlow::Continue);
|
||||
}
|
||||
|
||||
// Prepare the data buffer.
|
||||
|
|
@ -704,37 +625,26 @@ fn poll_descriptors_and_prepare_buffer(
|
|||
buffer.resize(buffer_size, 0u8);
|
||||
let available_frames = available_samples / stream.num_channels as usize;
|
||||
|
||||
PollDescriptorsFlow::Ready {
|
||||
Ok(PollDescriptorsFlow::Ready {
|
||||
stream_type,
|
||||
available_frames,
|
||||
}
|
||||
})
|
||||
}
|
||||
|
||||
// Read input data from ALSA and deliver it to the user.
|
||||
fn process_input(
|
||||
stream: &StreamInner,
|
||||
buffer: &mut [u8],
|
||||
available_frames: usize,
|
||||
data_callback: &mut (dyn FnMut(&Data) + Send + 'static),
|
||||
error_callback: &mut dyn FnMut(StreamError),
|
||||
) {
|
||||
let result = unsafe {
|
||||
alsa::snd_pcm_readi(
|
||||
stream.channel,
|
||||
buffer.as_mut_ptr() as *mut _,
|
||||
available_frames as alsa::snd_pcm_uframes_t,
|
||||
)
|
||||
};
|
||||
if let Err(err) = check_errors(result as _) {
|
||||
let description = format!("`snd_pcm_readi` failed: {}", err);
|
||||
error_callback(BackendSpecificError { description }.into());
|
||||
return;
|
||||
}
|
||||
) -> Result<(), BackendSpecificError> {
|
||||
stream.channel.io().readi(buffer)?;
|
||||
let sample_format = stream.sample_format;
|
||||
let data = buffer.as_mut_ptr() as *mut ();
|
||||
let len = buffer.len() / sample_format.sample_size();
|
||||
let data = unsafe { Data::from_parts(data, len, sample_format) };
|
||||
data_callback(&data);
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
// Request data from the user's function and write it via ALSA.
|
||||
|
|
@ -756,22 +666,17 @@ fn process_output(
|
|||
data_callback(&mut data);
|
||||
}
|
||||
loop {
|
||||
let result = unsafe {
|
||||
alsa::snd_pcm_writei(
|
||||
stream.channel,
|
||||
buffer.as_ptr() as *const _,
|
||||
available_frames as alsa::snd_pcm_uframes_t,
|
||||
)
|
||||
};
|
||||
if result == -libc::EPIPE as i64 {
|
||||
match stream.channel.io().writei(buffer) {
|
||||
Err(err) if err.errno() == Some(nix::errno::Errno::EPIPE) => {
|
||||
// buffer underrun
|
||||
// TODO: Notify the user of this.
|
||||
unsafe { alsa::snd_pcm_recover(stream.channel, result as i32, 0) };
|
||||
} else if let Err(err) = check_errors(result as _) {
|
||||
let description = format!("`snd_pcm_writei` failed: {}", err);
|
||||
error_callback(BackendSpecificError { description }.into());
|
||||
let _ = stream.channel.try_recover(err, false);
|
||||
}
|
||||
Err(err) => {
|
||||
error_callback(err.into());
|
||||
continue;
|
||||
} else if result as usize != available_frames {
|
||||
}
|
||||
Ok(result) if result != available_frames => {
|
||||
let description = format!(
|
||||
"unexpected number of frames written: expected {}, \
|
||||
result {} (this should never happen)",
|
||||
|
|
@ -779,11 +684,13 @@ fn process_output(
|
|||
);
|
||||
error_callback(BackendSpecificError { description }.into());
|
||||
continue;
|
||||
} else {
|
||||
}
|
||||
_ => {
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl Stream {
|
||||
fn new_input<D, E>(
|
||||
|
|
@ -840,237 +747,126 @@ impl Drop for Stream {
|
|||
|
||||
impl StreamTrait for Stream {
|
||||
fn play(&self) -> Result<(), PlayStreamError> {
|
||||
unsafe {
|
||||
alsa::snd_pcm_pause(self.inner.channel, 0);
|
||||
}
|
||||
// TODO: error handling
|
||||
self.inner.channel.pause(false)?;
|
||||
Ok(())
|
||||
}
|
||||
fn pause(&self) -> Result<(), PauseStreamError> {
|
||||
unsafe {
|
||||
alsa::snd_pcm_pause(self.inner.channel, 1);
|
||||
}
|
||||
// TODO: error handling
|
||||
self.inner.channel.pause(true)?;
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
// Check whether the event is `POLLOUT` or `POLLIN`.
|
||||
//
|
||||
// If so, return the stream type associated with the event.
|
||||
//
|
||||
// Otherwise, returns `Ok(None)`.
|
||||
//
|
||||
// Returns an `Err` if the `snd_pcm_poll_descriptors_revents` call fails.
|
||||
fn check_for_pollout_or_pollin(
|
||||
stream: &StreamInner,
|
||||
stream_descriptor_ptr: *mut libc::pollfd,
|
||||
) -> Result<Option<StreamType>, BackendSpecificError> {
|
||||
let (revent, res) = unsafe {
|
||||
let mut revent = 0;
|
||||
let res = alsa::snd_pcm_poll_descriptors_revents(
|
||||
stream.channel,
|
||||
stream_descriptor_ptr,
|
||||
stream.num_descriptors as libc::c_uint,
|
||||
&mut revent,
|
||||
);
|
||||
(revent, res)
|
||||
};
|
||||
if let Err(desc) = check_errors(res) {
|
||||
let description = format!("`snd_pcm_poll_descriptors_revents` failed: {}", desc);
|
||||
let err = BackendSpecificError { description };
|
||||
return Err(err);
|
||||
}
|
||||
|
||||
if revent as i16 == libc::POLLOUT {
|
||||
Ok(Some(StreamType::Output))
|
||||
} else if revent as i16 == libc::POLLIN {
|
||||
Ok(Some(StreamType::Input))
|
||||
} else {
|
||||
Ok(None)
|
||||
}
|
||||
}
|
||||
|
||||
// Determine the number of samples that are available to read/write.
|
||||
fn get_available_samples(stream: &StreamInner) -> Result<usize, BackendSpecificError> {
|
||||
let available = unsafe { alsa::snd_pcm_avail_update(stream.channel) };
|
||||
if available == -32 {
|
||||
match stream.channel.avail_update() {
|
||||
Err(err) if err.errno() == Some(nix::errno::Errno::EPIPE) => {
|
||||
// buffer underrun
|
||||
// TODO: Notify the user some how.
|
||||
Ok(stream.buffer_len)
|
||||
} else if let Err(desc) = check_errors(available as libc::c_int) {
|
||||
let description = format!("failed to get available samples: {}", desc);
|
||||
let err = BackendSpecificError { description };
|
||||
Err(err)
|
||||
} else {
|
||||
Ok((available * stream.num_channels as alsa::snd_pcm_sframes_t) as usize)
|
||||
}
|
||||
Err(err) => Err(err.into()),
|
||||
Ok(available) => Ok(available as usize * stream.num_channels as usize),
|
||||
}
|
||||
}
|
||||
|
||||
unsafe fn set_hw_params_from_format(
|
||||
pcm_handle: *mut alsa::snd_pcm_t,
|
||||
hw_params: &HwParams,
|
||||
fn set_hw_params_from_format<'a>(
|
||||
pcm_handle: &'a alsa::pcm::PCM,
|
||||
config: &StreamConfig,
|
||||
sample_format: SampleFormat,
|
||||
) -> Result<(), String> {
|
||||
if let Err(e) = check_errors(alsa::snd_pcm_hw_params_any(pcm_handle, hw_params.0)) {
|
||||
return Err(format!("errors on pcm handle: {}", e));
|
||||
}
|
||||
if let Err(e) = check_errors(alsa::snd_pcm_hw_params_set_access(
|
||||
pcm_handle,
|
||||
hw_params.0,
|
||||
alsa::SND_PCM_ACCESS_RW_INTERLEAVED,
|
||||
)) {
|
||||
return Err(format!("handle not acessible: {}", e));
|
||||
}
|
||||
) -> Result<alsa::pcm::HwParams<'a>, BackendSpecificError> {
|
||||
let hw_params = alsa::pcm::HwParams::any(pcm_handle)?;
|
||||
hw_params.set_access(alsa::pcm::Access::RWInterleaved)?;
|
||||
|
||||
let sample_format = if cfg!(target_endian = "big") {
|
||||
match sample_format {
|
||||
SampleFormat::I16 => alsa::SND_PCM_FORMAT_S16_BE,
|
||||
SampleFormat::U16 => alsa::SND_PCM_FORMAT_U16_BE,
|
||||
SampleFormat::F32 => alsa::SND_PCM_FORMAT_FLOAT_BE,
|
||||
SampleFormat::I16 => alsa::pcm::Format::S16BE,
|
||||
SampleFormat::U16 => alsa::pcm::Format::U16BE,
|
||||
SampleFormat::F32 => alsa::pcm::Format::FloatBE,
|
||||
}
|
||||
} else {
|
||||
match sample_format {
|
||||
SampleFormat::I16 => alsa::SND_PCM_FORMAT_S16_LE,
|
||||
SampleFormat::U16 => alsa::SND_PCM_FORMAT_U16_LE,
|
||||
SampleFormat::F32 => alsa::SND_PCM_FORMAT_FLOAT_LE,
|
||||
SampleFormat::I16 => alsa::pcm::Format::S16LE,
|
||||
SampleFormat::U16 => alsa::pcm::Format::U16LE,
|
||||
SampleFormat::F32 => alsa::pcm::Format::FloatLE,
|
||||
}
|
||||
};
|
||||
|
||||
if let Err(e) = check_errors(alsa::snd_pcm_hw_params_set_format(
|
||||
pcm_handle,
|
||||
hw_params.0,
|
||||
sample_format,
|
||||
)) {
|
||||
return Err(format!("format could not be set: {}", e));
|
||||
}
|
||||
if let Err(e) = check_errors(alsa::snd_pcm_hw_params_set_rate(
|
||||
pcm_handle,
|
||||
hw_params.0,
|
||||
config.sample_rate.0 as libc::c_uint,
|
||||
0,
|
||||
)) {
|
||||
return Err(format!("sample rate could not be set: {}", e));
|
||||
}
|
||||
if let Err(e) = check_errors(alsa::snd_pcm_hw_params_set_channels(
|
||||
pcm_handle,
|
||||
hw_params.0,
|
||||
config.channels as libc::c_uint,
|
||||
)) {
|
||||
return Err(format!("channel count could not be set: {}", e));
|
||||
}
|
||||
hw_params.set_format(sample_format)?;
|
||||
hw_params.set_rate(config.sample_rate.0, alsa::ValueOr::Nearest)?;
|
||||
hw_params.set_channels(config.channels as u32)?;
|
||||
|
||||
// If this isn't set manually a overlarge buffer may be used causing audio delay
|
||||
if let Err(e) = check_errors(alsa::snd_pcm_hw_params_set_buffer_time_near(
|
||||
pcm_handle,
|
||||
hw_params.0,
|
||||
&mut 100_000,
|
||||
&mut 0,
|
||||
)) {
|
||||
return Err(format!("buffer time could not be set: {}", e));
|
||||
hw_params.set_buffer_time_near(100_000, alsa::ValueOr::Nearest)?;
|
||||
|
||||
pcm_handle.hw_params(&hw_params)?;
|
||||
|
||||
Ok(hw_params)
|
||||
}
|
||||
|
||||
if let Err(e) = check_errors(alsa::snd_pcm_hw_params(pcm_handle, hw_params.0)) {
|
||||
return Err(format!("hardware params could not be set: {}", e));
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
unsafe fn set_sw_params_from_format(
|
||||
pcm_handle: *mut alsa::snd_pcm_t,
|
||||
fn set_sw_params_from_format(
|
||||
pcm_handle: &alsa::pcm::PCM,
|
||||
config: &StreamConfig,
|
||||
) -> Result<(usize, usize), String> {
|
||||
let mut sw_params = ptr::null_mut(); // TODO: RAII
|
||||
if let Err(e) = check_errors(alsa::snd_pcm_sw_params_malloc(&mut sw_params)) {
|
||||
return Err(format!("snd_pcm_sw_params_malloc failed: {}", e));
|
||||
}
|
||||
if let Err(e) = check_errors(alsa::snd_pcm_sw_params_current(pcm_handle, sw_params)) {
|
||||
return Err(format!("snd_pcm_sw_params_current failed: {}", e));
|
||||
}
|
||||
if let Err(e) = check_errors(alsa::snd_pcm_sw_params_set_start_threshold(
|
||||
pcm_handle, sw_params, 0,
|
||||
)) {
|
||||
return Err(format!(
|
||||
"snd_pcm_sw_params_set_start_threshold failed: {}",
|
||||
e
|
||||
));
|
||||
}
|
||||
) -> Result<(usize, usize), BackendSpecificError> {
|
||||
let sw_params = pcm_handle.sw_params_current()?;
|
||||
sw_params.set_start_threshold(0)?;
|
||||
|
||||
let (buffer_len, period_len) = {
|
||||
let mut buffer = 0;
|
||||
let mut period = 0;
|
||||
if let Err(e) = check_errors(alsa::snd_pcm_get_params(
|
||||
pcm_handle,
|
||||
&mut buffer,
|
||||
&mut period,
|
||||
)) {
|
||||
return Err(format!("failed to initialize buffer: {}", e));
|
||||
}
|
||||
let (buffer, period) = pcm_handle.get_params()?;
|
||||
if buffer == 0 {
|
||||
return Err(format!("initialization resulted in a null buffer"));
|
||||
}
|
||||
if let Err(e) = check_errors(alsa::snd_pcm_sw_params_set_avail_min(
|
||||
pcm_handle, sw_params, period,
|
||||
)) {
|
||||
return Err(format!("snd_pcm_sw_params_set_avail_min failed: {}", e));
|
||||
return Err(BackendSpecificError {
|
||||
description: "initialization resulted in a null buffer".to_string(),
|
||||
});
|
||||
}
|
||||
sw_params.set_avail_min(period as alsa::pcm::Frames)?;
|
||||
let buffer = buffer as usize * config.channels as usize;
|
||||
let period = period as usize * config.channels as usize;
|
||||
(buffer, period)
|
||||
};
|
||||
|
||||
if let Err(e) = check_errors(alsa::snd_pcm_sw_params(pcm_handle, sw_params)) {
|
||||
return Err(format!("snd_pcm_sw_params failed: {}", e));
|
||||
}
|
||||
pcm_handle.sw_params(&sw_params)?;
|
||||
|
||||
alsa::snd_pcm_sw_params_free(sw_params);
|
||||
Ok((buffer_len, period_len))
|
||||
}
|
||||
|
||||
/// Wrapper around `hw_params`.
|
||||
struct HwParams(*mut alsa::snd_pcm_hw_params_t);
|
||||
|
||||
impl HwParams {
|
||||
pub fn alloc() -> HwParams {
|
||||
unsafe {
|
||||
let mut hw_params = ptr::null_mut();
|
||||
check_errors(alsa::snd_pcm_hw_params_malloc(&mut hw_params))
|
||||
.expect("unable to get hardware parameters");
|
||||
HwParams(hw_params)
|
||||
impl From<alsa::Error> for BackendSpecificError {
|
||||
fn from(err: alsa::Error) -> Self {
|
||||
BackendSpecificError {
|
||||
description: err.to_string(),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl Drop for HwParams {
|
||||
fn drop(&mut self) {
|
||||
unsafe {
|
||||
alsa::snd_pcm_hw_params_free(self.0);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl Drop for StreamInner {
|
||||
#[inline]
|
||||
fn drop(&mut self) {
|
||||
unsafe {
|
||||
alsa::snd_pcm_close(self.channel);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn check_errors(err: libc::c_int) -> Result<(), String> {
|
||||
if err < 0 {
|
||||
unsafe {
|
||||
let s = ffi::CStr::from_ptr(alsa::snd_strerror(err))
|
||||
.to_bytes()
|
||||
.to_vec();
|
||||
let s = String::from_utf8(s).expect("Streaming error occured");
|
||||
return Err(s);
|
||||
impl From<alsa::Error> for BuildStreamError {
|
||||
fn from(err: alsa::Error) -> Self {
|
||||
let err: BackendSpecificError = err.into();
|
||||
err.into()
|
||||
}
|
||||
}
|
||||
|
||||
Ok(())
|
||||
impl From<alsa::Error> for SupportedStreamConfigsError {
|
||||
fn from(err: alsa::Error) -> Self {
|
||||
let err: BackendSpecificError = err.into();
|
||||
err.into()
|
||||
}
|
||||
}
|
||||
|
||||
impl From<alsa::Error> for PlayStreamError {
|
||||
fn from(err: alsa::Error) -> Self {
|
||||
let err: BackendSpecificError = err.into();
|
||||
err.into()
|
||||
}
|
||||
}
|
||||
|
||||
impl From<alsa::Error> for PauseStreamError {
|
||||
fn from(err: alsa::Error) -> Self {
|
||||
let err: BackendSpecificError = err.into();
|
||||
err.into()
|
||||
}
|
||||
}
|
||||
|
||||
impl From<alsa::Error> for StreamError {
|
||||
fn from(err: alsa::Error) -> Self {
|
||||
let err: BackendSpecificError = err.into();
|
||||
err.into()
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue