diff options
| -rw-r--r-- | .gitignore | 1 | ||||
| -rw-r--r-- | Cargo.lock | 828 | ||||
| -rw-r--r-- | Cargo.toml | 8 | ||||
| -rw-r--r-- | rustfmt.toml | 1 | ||||
| -rw-r--r-- | src/main.rs | 94 | ||||
| -rw-r--r-- | src/midi_input.rs | 372 |
6 files changed, 1304 insertions, 0 deletions
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device_mgr.list().expect("couldn't list MIDI devices"); + let mut index = 0; + for device in &devices { + print!("{:3} | ", index + 1); + let mut first = true; + for line in device.name.lines() { + if !first { + print!(" | "); + } + println!("{}", line); + first = false; + } + println!(" -----------------"); + index += 1; + } + print!("Select a device (default {}): ", devices.default + 1); + match std::io::stdout().flush() { + Err(_) => {} // whatever + _ => {} + } + + let device_id; + { + let mut buf = String::new(); + std::io::stdin() + .read_line(&mut buf) + .expect("error reading stdin"); + let s = buf.trim(); + if s.len() == 0 { + device_id = &devices[devices.default].id; + } else { + match s.parse::<usize>() { + Ok(idx) if idx >= 1 && idx <= devices.len() => { + device_id = &devices[idx - 1].id; + } + _ => { + eprintln!("Bad device ID: {}", s); + return; + } + } + } + } + let mut device = device_mgr + .open(&device_id) + .expect("error opening MIDI device"); + + loop { + let byte = device.read_byte(); + if let Some(x) = byte { + println!("{}", x); + } else { + println!("nothing"); + std::thread::sleep(std::time::Duration::from_millis(10)); + } + } + + /* + let host = cpal::default_host(); + let device = host.default_output_device().expect("no output device available"); + let mut supported_configs_range = device.supported_output_configs() + .expect("error while querying configs"); + let config = supported_configs_range.next() + .expect("no supported config?!") + .with_max_sample_rate() + .into(); + let stream = device.build_output_stream( + &config, + move |data: &mut [i16], _: &cpal::OutputCallbackInfo| { + for sample in data.iter_mut() { + *sample = 0; + } + }, + move |err| { + println!("audio stream error: {}", err); + }, + ).expect("couldn't build output stream"); + stream.play().expect("couldn't play stream"); + + loop { + std::thread::sleep(std::time::Duration::from_millis(100)); + } + */ +} diff --git a/src/midi_input.rs b/src/midi_input.rs new file mode 100644 index 0000000..cdf5b87 --- /dev/null +++ b/src/midi_input.rs @@ -0,0 +1,372 @@ +/// Query and read from MIDI input devices. +/// Don't assume these functions are thread-safe. +/// You should only need to call them in the main thread anyways. +/// Basic usage: +/// ``` +/// let mut manager = DeviceManager::new().unwrap(); +/// let mut devices = manager.list(); +/// while devices.len() == 0 { +/// std::thread::sleep(std::time::Duration::from_millis(100)); +/// devices = manager.list(); +/// } +/// let mut i = devices.default; +/// for device in devices { +/// println!("{}",device.name); +/// } +/// let device = manager.open(&devices[i].id); +/// loop { +/// if let Some(byte) = device.read_byte() { +/// ... +/// } else { +/// std::thread::sleep(std::time::Duration::from_millis(100)); +/// } +/// } +/// ``` +use std::ffi::{c_char, c_int, c_void, CStr, CString}; +// so much stuff depends on libc +// it's not such a big deal to add it as a dependency +// (we only really need it for size_t, ssize_t) +extern crate libc; +use libc::{size_t, ssize_t, free}; + + +use std::sync::Mutex; + +// (snd_rawmidi_t is an opaque struct) +type SndRawMidiT = c_void; + +/// Opaque device manager type. +pub struct DeviceManager {} + +/// Opaque type for device ID. +#[derive(Debug, Clone)] +pub struct DeviceID { + name: String, +} + +/// Information about a device. +pub struct DeviceInfo { + /// A human-readable name for the device. + /// This may contain newlines. You can just use the first line + /// if you want a quick description. + pub name: String, + /// The id, to be used with `open_device`. + pub id: DeviceID, +} + +/// Opaque type for MIDI input device. +#[derive(Debug)] +pub struct Device { + rawmidi: *mut SndRawMidiT, + error: i32 +} + +/// An error produced by opening a device. +#[derive(Debug)] +pub enum DeviceOpenError { + /// the device was not found. + /// this can hapen if it was disconnected between calling `list_devices` + /// and `open_device`. + NotFound(String), + /// other error + Other(String), +} + +pub struct DeviceList { + pub devices: Vec<DeviceInfo>, + pub default: usize +} + + +impl IntoIterator for DeviceList { + type Item = DeviceInfo; + type IntoIter = std::vec::IntoIter<Self::Item>; + + fn into_iter(self) -> Self::IntoIter { + self.devices.into_iter() + } +} + +impl<'a> IntoIterator for &'a DeviceList { + type Item = &'a DeviceInfo; + type IntoIter = std::slice::Iter<'a, DeviceInfo>; + + fn into_iter(self) -> Self::IntoIter { + (&self.devices).into_iter() + } +} + +impl DeviceList { + pub fn len(&self) -> usize { + self.devices.len() + } +} + + +impl std::ops::Index<usize> for DeviceList { + type Output = DeviceInfo; + + fn index(&self, i: usize) -> &Self::Output { + &self.devices[i] + } +} + +#[link(name = "asound", kind = "dylib")] +extern "C" { + fn snd_device_name_hint( + card: c_int, + devname: *const c_char, + hints: *mut *mut *mut c_void, + ) -> c_int; + fn snd_device_name_get_hint(hint: *const c_void, id: *const c_char) -> *mut c_char; + fn snd_device_name_free_hint(hints: *mut *mut c_void) -> c_int; + fn snd_rawmidi_open( + inputp: *mut *mut SndRawMidiT, + outputp: *mut *mut SndRawMidiT, + name: *const c_char, + mode: c_int, + ) -> c_int; + fn snd_rawmidi_nonblock(rawmidi: *mut SndRawMidiT, nonblock: c_int) -> c_int; + fn snd_rawmidi_read(rawmidi: *mut SndRawMidiT, buffer: *mut c_void, size: size_t) -> ssize_t; + fn snd_rawmidi_close(rawmidi: *mut SndRawMidiT) -> c_int; + fn snd_lib_error_set_handler(handler: *mut c_void) -> c_int; +} + +impl Into<String> for DeviceOpenError { + fn into(self) -> String { + use DeviceOpenError::*; + match self { + NotFound(s) => format!("device not found: {}", s), + Other(s) => s.clone(), + } + } +} + +// technically there should be varargs here but oh well +pub unsafe extern "C" fn snd_lib_error_handler_quiet( + _file: *const c_char, + _line: i32, + _function: *const c_char, + _err: i32, +) { +} + +// convert cstr to Option<String>. you'll get back None if +// either cstr is null, or invalid UTF-8. +unsafe fn cstr_to_option_string(cstr: *const c_char) -> Option<String> { + if cstr == 0 as _ { + return None; + } + + let result = CStr::from_ptr(cstr).to_str(); + match result { + Ok(s) => Some(s.to_string()), + Err(_) => None, + } +} + +static DEVICE_MANAGER_EXISTS: Mutex<bool> = Mutex::new(false); + +impl DeviceManager { + /// Create a new manager for MIDI input devices. + /// Only ONE device manager can exist at any point in time. + pub fn new() -> Result<DeviceManager, String> { + let mut r = DEVICE_MANAGER_EXISTS + .lock() + .map_err(|_| "Failed to lock mutex".to_string())?; + if *r { + return Err("A device manager already exists.".to_string()); + } + *r = true; + Ok(DeviceManager {}) + } + + /// Pass `true` to stop ALSA from outputting errors to `stderr` + /// (no effect on Windows). + pub fn set_quiet(&mut self, quiet: bool) { + let mut callback: *mut c_void = 0 as _; + + if quiet { + callback = snd_lib_error_handler_quiet as _; + } + unsafe { + snd_lib_error_set_handler(callback); + } + } + + /// Returns a `DeviceList` containing descriptions for all MIDI input devices. + pub fn list(&self) -> Result<DeviceList, String> { + let mut hints: *mut *mut c_void = 0 as _; + let err: c_int; + unsafe { + err = + snd_device_name_hint(-1, "rawmidi\0".as_ptr() as *const c_char, (&mut hints) as _); + } + + // in theory hints should never be null if err != 0. + // but you can never be sure. + if err != 0 || hints == 0 as _ { + return Err(format!("failed to get device hints (error code {})", err)); + } + + let mut idx: usize = 0; + let mut devices = vec![]; + let mut default = None; + + loop { + let hint; + unsafe { + hint = *hints.offset(idx as isize); + } + if hint.is_null() { + break; + } + + let name; + let desc; + + unsafe { + let name_cstr = snd_device_name_get_hint(hint, "NAME\0".as_ptr() as _); + let desc_cstr = snd_device_name_get_hint(hint, "DESC\0".as_ptr() as _); + //let ioid_cstr = snd_device_name_get_hint(hint, "IOID\0".as_ptr() as _); + + name = cstr_to_option_string(name_cstr); + desc = cstr_to_option_string(desc_cstr); + + free(name_cstr as _); + free(desc_cstr as _); + } + + // we need the name to be able to do anything with the device + if let Some(name_unwrapped) = name { + let has_desc = desc.is_some(); + let desc_unwrapped = desc.unwrap_or("(no description)".to_string()); + let desc_str = format!("{}\n{}", name_unwrapped, desc_unwrapped); + let info = DeviceInfo { + id: DeviceID { + name: name_unwrapped, + }, + name: desc_str, + }; + + if has_desc && default.is_none() { + default = Some(idx); + } + + devices.push(info); + } + + idx += 1; + } + + unsafe { + snd_device_name_free_hint(hints); + } + + Ok(DeviceList { + devices, + default: default.unwrap_or(0) + }) + } + + /// Open a device. + pub fn open(&self, id: &DeviceID) -> Result<Device, DeviceOpenError> { + let name_cstr = CString::new(&id.name[..]).map_err(|_| { + // (name has null bytes) + // this should never happen since `name` should + // have been constructed from a cstr. + // but it could happen if someone uses unsafe or something. + DeviceOpenError::Other("invalid device ID".to_string()) + })?; + let mut input: *mut SndRawMidiT = 0 as _; + let mut err; + unsafe { + err = snd_rawmidi_open((&mut input) as _, 0 as _, name_cstr.as_ptr(), 0); + if err == 0 && !input.is_null() { + err = snd_rawmidi_nonblock(input, 1); + } + } + if err != 0 || input.is_null() { + if err == -2 { + return Err(DeviceOpenError::NotFound(id.name.clone())); + } + return Err(DeviceOpenError::Other(format!( + "other error (code {})", + err + ))); + } + Ok(Device { rawmidi: input, error: 0 }) + } +} + + +impl Device { + fn read_raw(&mut self, buffer: &mut [u8]) -> usize { + let n; + unsafe { + let pbuffer = &mut buffer[0] as *mut u8 as *mut c_void; + n = snd_rawmidi_read(self.rawmidi, pbuffer, buffer.len() as _); + } + if n < 0 { + self.error = n as _; + 0 + } else if (n as usize) <= buffer.len() { + n as usize + } else { + // this shouldn't happen + // something messed up + self.error = -1000; + 0 + } + } + + /// Read a single byte of MIDI input, if there is any. + /// It's probably fine to use this instead of `read()` in most cases, + /// since you probably aren't getting megabytes of MIDI data per second or anything. + /// For simplicity, this function just returns None if a read error occurs. + /// Check `get_error()` if you really care. + #[allow(dead_code)] + pub fn read_byte(&mut self) -> Option<u8> { + let mut buffer = [0u8; 1]; + let n = self.read_raw(&mut buffer); + if n == 1 { + Some(buffer[0]) + } else { + None + } + } + + /// get the device error if there is one + #[allow(dead_code)] + pub fn get_error(&self) -> Option<String> { + if self.error == 0 { + return None; + } + Some(format!("ALSA error code {}", self.error)) + } + + /// read as many bytes of MIDI input as are available, + /// up to a reasonable limit. + #[allow(dead_code)] + pub fn read(&mut self) -> Vec<u8> { + let mut buffer = [0u8; 1024]; + let n = self.read_raw(&mut buffer); + buffer[..n].to_vec() + + } +} + +impl Drop for DeviceManager { + fn drop(&mut self) { + *DEVICE_MANAGER_EXISTS.lock().unwrap() = false; + } +} + +impl Drop for Device { + fn drop(&mut self) { + unsafe { + // there's not much we can do if this fails. + snd_rawmidi_close(self.rawmidi); + } + } +} |