asio sys lib comments and rust fmt

This commit is contained in:
Tom Gowan 2018-11-05 11:28:59 +11:00 committed by mitchmindtree
parent ffcbc02e52
commit f6d1a74be2
3 changed files with 493 additions and 317 deletions

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@ -11,57 +11,85 @@ mod asio_import;
#[macro_use]
pub mod errors;
use errors::{AsioError, AsioDriverError, AsioErrorWrapper};
use errors::{AsioDriverError, AsioError, AsioErrorWrapper};
use std::ffi::CStr;
use std::ffi::CString;
use std::mem;
use std::os::raw::{c_char, c_double, c_long, c_void};
use std::sync::atomic::{AtomicUsize, AtomicBool, Ordering};
use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
use std::sync::{Mutex, MutexGuard};
// Bindings import
use asio_import as ai;
// TODO I dont think this is needed anymore
pub struct CbArgs<S, D> {
pub stream_id: S,
pub data: D,
}
/// Holds the pointer to the callbacks that come from cpal
struct BufferCallback(Box<FnMut(i32) + Send>);
/// A global way to access all the callbacks.
/// This is required because of how ASIO
/// calls the buffer_switch function.
/// Options are used so that when a callback is
/// removed we don't change the Vec indicies.
/// The indicies are how we match a callback
/// with a stream.
lazy_static! {
static ref buffer_callback: Mutex<Vec<Option<BufferCallback>>> = Mutex::new(Vec::new());
}
/// Globally available state of the ASIO driver.
/// This allows all calls the the driver to ensure
/// they are calling in the correct state.
/// It also prevents multiple calls happening at once.
lazy_static! {
static ref ASIO_DRIVERS: Mutex<AsioWrapper> = Mutex::new(AsioWrapper {
state: AsioState::Offline,
});
}
/// Count of active device and streams.
/// Used to clean up the driver connection
/// when there are no active connections.
static STREAM_DRIVER_COUNT: AtomicUsize = AtomicUsize::new(0);
/// Tracks which buffer needs to be silenced.
pub static SILENCE_FIRST: AtomicBool = AtomicBool::new(false);
pub static SILENCE_SECOND: AtomicBool = AtomicBool::new(false);
/// Amount of input and output
/// channels available.
#[derive(Debug)]
pub struct Channel {
pub ins: i64,
pub outs: i64,
}
/// Sample rate of the ASIO device.
#[derive(Debug)]
pub struct SampleRate {
pub rate: u32,
}
/// A marker type to make sure
/// all calls to the driver have an
/// active connection.
#[derive(Debug, Clone)]
pub struct Drivers;
/// Tracks the current state of the
/// ASIO drivers.
#[derive(Debug)]
struct AsioWrapper {
state: AsioState,
}
/// All possible states of the
/// ASIO driver. Mapped to the
/// FSM in the ASIO SDK docs.
#[derive(Debug)]
enum AsioState {
Offline,
@ -71,18 +99,27 @@ enum AsioState {
Running,
}
/// Input and Output streams.
/// There is only ever max one
/// input and one output. Only one
/// is required.
pub struct AsioStreams {
pub input: Option<AsioStream>,
pub output: Option<AsioStream>,
}
/// A stream to ASIO.
/// Contains the buffers.
pub struct AsioStream {
/// A Double buffer per channel
pub buffer_infos: Vec<AsioBufferInfo>,
/// Size of each buffer
pub buffer_size: i32,
}
// This is a direct copy of the ASIOSampleType
// inside ASIO SDK.
/// All the possible types from ASIO.
/// This is a direct copy of the ASIOSampleType
/// inside ASIO SDK.
#[derive(Debug, FromPrimitive)]
#[repr(C)]
pub enum AsioSampleType {
@ -120,14 +157,20 @@ pub enum AsioSampleType {
ASIOSTLastEntry,
}
/// Gives information about buffers
/// Receives pointers to buffers
#[derive(Debug, Copy, Clone)]
#[repr(C)]
pub struct AsioBufferInfo {
/// 0 for output 1 for input
pub is_input: c_long,
/// Which channel. Starts at 0
pub channel_num: c_long,
/// Pointer to each half of the double buffer.
pub buffers: [*mut c_void; 2],
}
/// Callbacks that ASIO calls
#[repr(C)]
struct AsioCallbacks {
buffer_switch: extern "C" fn(double_buffer_index: c_long, direct_process: c_long) -> (),
@ -141,7 +184,14 @@ struct AsioCallbacks {
direct_process: c_long,
) -> *mut ai::ASIOTime,
}
/// This is called by ASIO.
/// Here we run the callback for each stream.
/// double_buffer_index is either 0 or 1
/// indicating which buffer to fill
extern "C" fn buffer_switch(double_buffer_index: c_long, _direct_process: c_long) -> () {
// This lock is probably unavoidable
// but locks in the audio stream is not great
let mut bcs = buffer_callback.lock().unwrap();
for mut bc in bcs.iter_mut() {
@ -151,48 +201,61 @@ extern "C" fn buffer_switch(double_buffer_index: c_long, _direct_process: c_long
}
}
/// Idicates the sample rate has changed
/// TODO Change the sample rate when this
/// is called.
extern "C" fn sample_rate_did_change(_s_rate: c_double) -> () {}
/// Messages for ASIO
/// This is not currently used
extern "C" fn asio_message(
_selector: c_long, _value: c_long, _message: *mut (), _opt: *mut c_double,
) -> c_long {
// TODO Impliment this to give proper responses
4 as c_long
}
/// Similar to buffer switch but with time info
/// Not currently used
extern "C" fn buffer_switch_time_info(
params: *mut ai::ASIOTime, _double_buffer_index: c_long, _direct_process: c_long,
) -> *mut ai::ASIOTime {
params
}
/// Helper function for getting the drivers.
/// Note this is a lock.
fn get_drivers() -> MutexGuard<'static, AsioWrapper> {
ASIO_DRIVERS.lock().unwrap()
}
impl Drivers {
/// Load the drivers from a driver name.
/// This will destroy the old drivers.
#[allow(unused_assignments)]
pub fn load(driver_name: &str) -> Result<Self, AsioDriverError> {
let mut drivers = get_drivers();
// Make owned CString to send to load driver
let mut my_driver_name =
CString::new(driver_name).expect("Can't go from str to CString");
let mut my_driver_name = CString::new(driver_name).expect("Can't go from str to CString");
let raw = my_driver_name.into_raw();
let mut driver_info = ai::ASIODriverInfo {
_bindgen_opaque_blob: [0u32; 43],
};
unsafe {
// Destroy old drivers and load new drivers.
let load_result = drivers.load(raw);
// Take back ownership
my_driver_name = CString::from_raw(raw);
if load_result {
// Initialize ASIO
match drivers.asio_init(&mut driver_info) {
Ok(_) => {
// If it worked then add a active connection to the drivers
// TODO Make sure this is decremented when old drivers are dropped
STREAM_DRIVER_COUNT.fetch_add(1, Ordering::SeqCst);
Ok(Drivers)
},
Err(_) => {
Err(AsioDriverError::DriverLoadError)
},
Err(_) => Err(AsioDriverError::DriverLoadError),
}
} else {
Err(AsioDriverError::DriverLoadError)
@ -200,13 +263,8 @@ impl Drivers {
}
}
/// Returns the channels for the driver it's passed
///
/// # Arguments
/// * `driver name` - Name of the driver
/// # Usage
/// Use the get_driver_list() to get the list of names
/// Then pass the one you want to get_channels
/// Returns the number of input and output
/// channels for the active drivers
pub fn get_channels(&self) -> Channel {
let channel: Channel;
@ -214,7 +272,11 @@ impl Drivers {
let mut ins: c_long = 0;
let mut outs: c_long = 0;
unsafe {
get_drivers().asio_get_channels(&mut ins, &mut outs).expect("failed to get channels");
get_drivers()
.asio_get_channels(&mut ins, &mut outs)
// TODO pass this result along
// and handle it without panic
.expect("failed to get channels");
channel = Channel {
ins: ins as i64,
outs: outs as i64,
@ -224,6 +286,7 @@ impl Drivers {
channel
}
/// Get current sample rate of the active drivers
pub fn get_sample_rate(&self) -> SampleRate {
let sample_rate: SampleRate;
@ -231,47 +294,59 @@ impl Drivers {
let mut rate: c_double = 0.0f64;
unsafe {
get_drivers().asio_get_sample_rate(&mut rate).expect("failed to get sample rate");
get_drivers()
.asio_get_sample_rate(&mut rate)
// TODO pass this result along
// and handle it without panic
.expect("failed to get sample rate");
sample_rate = SampleRate { rate: rate as u32 };
}
sample_rate
}
/// Set the sample rate for the active drivers
pub fn set_sample_rate(&self, sample_rate: u32) -> Result<(), AsioError> {
// Initialize memory for calls
let rate: c_double = c_double::from(sample_rate);
unsafe {
get_drivers().asio_set_sample_rate(rate)
}
unsafe { get_drivers().asio_set_sample_rate(rate) }
}
/// Can the drivers accept the given sample rate
pub fn can_sample_rate(&self, sample_rate: u32) -> bool {
// Initialize memory for calls
let rate: c_double = c_double::from(sample_rate);
unsafe {
get_drivers().asio_can_sample_rate(rate).is_ok()
}
// TODO this gives an error is it can't handle the sample
// rate but it can also give error for no divers
// Both should be handled.
unsafe { get_drivers().asio_can_sample_rate(rate).is_ok() }
}
/// Get the current data type of the active drivers.
/// Just queries a single channels type as all channels
/// have the same sample type.
pub fn get_data_type(&self) -> Result<AsioSampleType, AsioDriverError> {
// TODO make this a seperate call for input and output as
// it is possible that input and output have different sample types
// Initialize memory for calls
let mut channel_info = ai::ASIOChannelInfo {
// Which channel we are querying
channel: 0,
// Was it input or output
isInput: 0,
// Was it active
isActive: 0,
channelGroup: 0,
// The sample type
type_: 0,
name: [0 as c_char; 32],
};
unsafe {
match get_drivers().asio_get_channel_info(&mut channel_info) {
Ok(_) => {
num::FromPrimitive::from_i32(channel_info.type_)
.map_or(Err(AsioDriverError::TypeError), |t| Ok(t))
},
Ok(_) => num::FromPrimitive::from_i32(channel_info.type_)
.map_or(Err(AsioDriverError::TypeError), |t| Ok(t)),
Err(e) => {
println!("Error getting data type {}", e);
Err(AsioDriverError::DriverLoadError)
@ -280,50 +355,92 @@ impl Drivers {
}
}
pub fn prepare_input_stream(&self, output: Option<AsioStream>, num_channels: usize) -> Result<AsioStreams, AsioDriverError> {
/// Prepare the input stream.
/// Because only the latest call
/// to ASIOCreateBuffers is relevant this
/// call will destroy all past active buffers
/// and recreate them. For this reason we take
/// the output stream if it exists.
/// num_channels is the number of input channels.
/// This returns a full AsioStreams with both input
/// and output if output was active.
pub fn prepare_input_stream(
&self, output: Option<AsioStream>, num_channels: usize,
) -> Result<AsioStreams, AsioDriverError> {
let buffer_infos = (0 .. num_channels)
.map(|i| {
AsioBufferInfo {
.map(|i| AsioBufferInfo {
// These are output channels
is_input: 1,
// Channel index
channel_num: i as c_long,
// Double buffer. We don't know the type
// at this point
buffers: [std::ptr::null_mut(); 2],
}
})
.collect();
}).collect();
let streams = AsioStreams{input: Some(AsioStream{buffer_infos, buffer_size: 0}), output};
// Create the streams
let streams = AsioStreams {
input: Some(AsioStream {
buffer_infos,
buffer_size: 0,
}),
output,
};
self.create_streams(streams)
}
/// Creates the output stream
pub fn prepare_output_stream(&self, input: Option<AsioStream>, num_channels: usize) -> Result<AsioStreams, AsioDriverError> {
/// Prepare the output stream.
/// Because only the latest call
/// to ASIOCreateBuffers is relevant this
/// call will destroy all past active buffers
/// and recreate them. For this reason we take
/// the input stream if it exists.
/// num_channels is the number of output channels.
/// This returns a full AsioStreams with both input
/// and output if input was active.
pub fn prepare_output_stream(
&self, input: Option<AsioStream>, num_channels: usize,
) -> Result<AsioStreams, AsioDriverError> {
// Initialize data for FFI
let buffer_infos = (0 .. num_channels)
.map(|i| {
AsioBufferInfo {
.map(|i| AsioBufferInfo {
// These are outputs
is_input: 0,
// Channel index
channel_num: i as c_long,
// Pointer to each buffer. We don't know
// the type yet.
buffers: [std::ptr::null_mut(); 2],
}
})
.collect();
let streams = AsioStreams{output: Some(AsioStream{buffer_infos, buffer_size: 0}), input};
}).collect();
// Create streams
let streams = AsioStreams {
output: Some(AsioStream {
buffer_infos,
buffer_size: 0,
}),
input,
};
self.create_streams(streams)
}
/// Creates the output stream
/// Creates the streams.
/// Both input and output streams
/// need to be created together as
/// a single slice of ASIOBufferInfo
fn create_streams(&self, streams: AsioStreams) -> Result<AsioStreams, AsioDriverError> {
let AsioStreams {
input,
output,
} = streams;
let AsioStreams { input, output } = streams;
match (input, output) {
// Both stream exist.
(Some(input), Some(mut output)) => {
let split_point = input.buffer_infos.len();
let mut bi = input.buffer_infos;
// Append the output to the input channels
bi.append(&mut output.buffer_infos);
self.create_buffers(bi)
.map(|(mut bi, buffer_size)|{
// Create the buffers.
// if successful then split the output
// and input again
self.create_buffers(bi).map(|(mut bi, buffer_size)| {
let out_bi = bi.split_off(split_point);
let in_bi = bi;
let output = Some(AsioStream {
@ -337,6 +454,7 @@ impl Drivers {
AsioStreams { output, input }
})
},
// Just input
(Some(input), None) => {
self.create_buffers(input.buffer_infos)
.map(|(buffer_infos, buffer_size)| {
@ -350,6 +468,7 @@ impl Drivers {
}
})
},
// Just output
(None, Some(output)) => {
self.create_buffers(output.buffer_infos)
.map(|(buffer_infos, buffer_size)| {
@ -363,13 +482,19 @@ impl Drivers {
}
})
},
// Impossible
(None, None) => panic!("Trying to create streams without preparing"),
}
}
fn create_buffers(&self, buffer_infos: Vec<AsioBufferInfo>)
-> Result<(Vec<AsioBufferInfo>, c_long), AsioDriverError>{
/// Ask ASIO to allocate the buffers
/// and give the callback pointers.
/// This will destroy any already allocated
/// buffers.
/// The prefered buffer size from ASIO is used.
fn create_buffers(
&self, buffer_infos: Vec<AsioBufferInfo>,
) -> Result<(Vec<AsioBufferInfo>, c_long), AsioDriverError> {
let num_channels = buffer_infos.len();
let callbacks = AsioCallbacks {
buffer_switch: buffer_switch,
@ -391,48 +516,46 @@ impl Drivers {
// max possible size
// preferred size
// granularity
drivers.asio_get_buffer_size(
drivers
.asio_get_buffer_size(
&mut min_b_size,
&mut max_b_size,
&mut pref_b_size,
&mut grans,
).expect("Failed getting buffers");
if pref_b_size > 0 {
/*
let mut buffer_info_convert: Vec<ai::ASIOBufferInfo> = buffer_infos
.into_iter()
.map(|bi| mem::transmute::<AsioBufferInfo, ai::ASIOBufferInfo>(bi))
.collect();
*/
let mut buffer_info_convert = mem::transmute::<Vec<AsioBufferInfo>, Vec<ai::ASIOBufferInfo>>(buffer_infos);
// Convert Rust structs to opaque ASIO structs
let mut buffer_info_convert =
mem::transmute::<Vec<AsioBufferInfo>, Vec<ai::ASIOBufferInfo>>(buffer_infos);
let mut callbacks_convert =
mem::transmute::<AsioCallbacks, ai::ASIOCallbacks>(callbacks);
drivers.asio_create_buffers(
drivers
.asio_create_buffers(
buffer_info_convert.as_mut_ptr(),
num_channels as i32,
pref_b_size,
&mut callbacks_convert,
).map(|_| {
let buffer_infos = mem::transmute::<Vec<ai::ASIOBufferInfo>, Vec<AsioBufferInfo>>(buffer_info_convert);
for d in &buffer_infos {
println!("after {:?}", d);
}
println!("channels: {:?}", num_channels);
let buffer_infos = mem::transmute::<
Vec<ai::ASIOBufferInfo>,
Vec<AsioBufferInfo>,
>(buffer_info_convert);
(buffer_infos, pref_b_size)
}).map_err(|e| {
AsioDriverError::BufferError(format!(
"failed to create buffers, error code: {:?}", e))
"failed to create buffers, error code: {:?}",
e
))
})
} else {
Err(AsioDriverError::BufferError(
"bad buffer size".to_owned(),
))
Err(AsioDriverError::BufferError("bad buffer size".to_owned()))
}
}
}
}
/// If all drivers and streams are gone
/// clean up drivers
impl Drop for Drivers {
fn drop(&mut self) {
let count = STREAM_DRIVER_COUNT.fetch_sub(1, Ordering::SeqCst);
@ -442,17 +565,21 @@ impl Drop for Drivers {
}
}
/// Required for Mutex
unsafe impl Send for AsioWrapper {}
/// Required for Mutex
unsafe impl Send for AsioStream {}
impl BufferCallback {
/// Calls the inner callback
fn run(&mut self, index: i32) {
let cb = &mut self.0;
cb(index);
}
}
unsafe impl Send for AsioStream {}
/// Adds a callback to the list of active callbacks
pub fn set_callback<F: 'static>(callback: F) -> ()
where
F: FnMut(i32) + Send,
@ -461,20 +588,25 @@ where
bc.push(Some(BufferCallback(Box::new(callback))));
}
/// Returns a list of all the ASIO drivers
/// Returns a list of all the ASIO devices.
/// This is used at the start to allow the
/// user to choose which device they want.
#[allow(unused_assignments)]
pub fn get_driver_list() -> Vec<String> {
// The most devices we can take
const MAX_DRIVERS: usize = 100;
// Max length for divers name
const CHAR_LEN: usize = 32;
// 2D array of driver names set to 0
let mut driver_names: [[c_char; CHAR_LEN]; MAX_DRIVERS] = [[0; CHAR_LEN]; MAX_DRIVERS];
// Pointer to each driver name
let mut p_driver_name: [*mut i8; MAX_DRIVERS] = [0 as *mut i8; MAX_DRIVERS];
for i in 0 .. MAX_DRIVERS {
p_driver_name[i] = driver_names[i].as_mut_ptr();
}
unsafe {
let num_drivers = ai::get_driver_names(p_driver_name.as_mut_ptr(), MAX_DRIVERS as i32);
@ -483,33 +615,50 @@ pub fn get_driver_list() -> Vec<String> {
let mut my_driver_name = CString::new("").unwrap();
let name = CStr::from_ptr(p_driver_name[i as usize]);
my_driver_name = name.to_owned();
my_driver_name.into_string().expect("Failed to convert driver name")
})
.collect()
my_driver_name
.into_string()
.expect("Failed to convert driver name")
}).collect()
}
}
/// Cleans up the drivers and
/// any allocations
pub fn clean_up() {
let mut drivers = get_drivers();
drivers.clean_up();
}
/// Starts input and output streams playing
pub fn play() {
unsafe {
// TODO handle result instead of printing
let result = get_drivers().asio_start();
println!("start result: {:?}", result);
}
}
/// Stops input and output streams playing
pub fn stop() {
unsafe {
// TODO handle result instead of printing
let result = get_drivers().asio_stop();
println!("stop result: {:?}", result);
}
}
/// All the actual calls to ASIO.
/// This is where we handle the state
/// and assert that all calls
/// happen in the correct state.
/// TODO it is possible to enforce most of this
/// at compile time using type parameters.
/// All calls have results that are converted
/// to Rust style results.
impl AsioWrapper {
/// Load the driver.
/// Unloads the previous driver.
/// Sets state to Loaded on success.
unsafe fn load(&mut self, raw: *mut i8) -> bool {
use AsioState::*;
self.clean_up();
@ -521,25 +670,31 @@ unsafe fn load(&mut self, raw: *mut i8) -> bool {
}
}
/// Unloads the current driver from ASIO
unsafe fn unload(&mut self) {
ai::remove_current_driver();
}
/// Initializes ASIO.
/// Needs to be already Loaded.
/// Initialized on success.
/// No-op if already Initialized or higher.
/// TODO should fail if Offline
unsafe fn asio_init(&mut self, di: &mut ai::ASIODriverInfo) -> Result<(), AsioError> {
if let AsioState::Loaded = self.state {
let result = ai::ASIOInit(di);
asio_result!(result)
.map(|_| self.state = AsioState::Initialized)
.map_err(|e| {
self.state = AsioState::Offline;
e
})
} else {
Ok(())
}
}
unsafe fn asio_get_channels(&mut self, ins: &mut c_long, outs: &mut c_long) -> Result<(), AsioError> {
/// Gets the number of channels.
/// Needs to be atleast Loaded.
unsafe fn asio_get_channels(
&mut self, ins: &mut c_long, outs: &mut c_long,
) -> Result<(), AsioError> {
if let AsioState::Offline = self.state {
Err(AsioError::NoDrivers)
} else {
@ -548,6 +703,8 @@ unsafe fn asio_get_channels(&mut self, ins: &mut c_long, outs: &mut c_long) -> R
}
}
/// Gets the sample rate.
/// Needs to be atleast Loaded.
unsafe fn asio_get_sample_rate(&mut self, rate: &mut c_double) -> Result<(), AsioError> {
if let AsioState::Offline = self.state {
Err(AsioError::NoDrivers)
@ -557,6 +714,8 @@ unsafe fn asio_get_sample_rate(&mut self, rate: &mut c_double) -> Result<(), Asi
}
}
/// Sets the sample rate.
/// Needs to be atleast Loaded.
unsafe fn asio_set_sample_rate(&mut self, rate: c_double) -> Result<(), AsioError> {
if let AsioState::Offline = self.state {
Err(AsioError::NoDrivers)
@ -566,6 +725,8 @@ unsafe fn asio_set_sample_rate(&mut self, rate: c_double) -> Result<(), AsioErro
}
}
/// Queries if the sample rate is possible.
/// Needs to be atleast Loaded.
unsafe fn asio_can_sample_rate(&mut self, rate: c_double) -> Result<(), AsioError> {
if let AsioState::Offline = self.state {
Err(AsioError::NoDrivers)
@ -575,7 +736,11 @@ unsafe fn asio_can_sample_rate(&mut self, rate: c_double) -> Result<(), AsioErro
}
}
unsafe fn asio_get_channel_info(&mut self, ci: &mut ai::ASIOChannelInfo) -> Result<(), AsioError> {
/// Get information about a channel.
/// Needs to be atleast Loaded.
unsafe fn asio_get_channel_info(
&mut self, ci: &mut ai::ASIOChannelInfo,
) -> Result<(), AsioError> {
if let AsioState::Offline = self.state {
Err(AsioError::NoDrivers)
} else {
@ -584,38 +749,40 @@ unsafe fn asio_get_channel_info(&mut self, ci: &mut ai::ASIOChannelInfo) -> Resu
}
}
/// Gets the buffer sizes.
/// Needs to be atleast Loaded.
unsafe fn asio_get_buffer_size(
&mut self,
min_b_size: &mut c_long, max_b_size: &mut c_long, pref_b_size: &mut c_long, grans: &mut c_long,
&mut self, min_b_size: &mut c_long, max_b_size: &mut c_long, pref_b_size: &mut c_long,
grans: &mut c_long,
) -> Result<(), AsioError> {
if let AsioState::Offline = self.state {
Err(AsioError::NoDrivers)
} else {
let result = ai::ASIOGetBufferSize(
min_b_size,
max_b_size,
pref_b_size,
grans,
);
let result = ai::ASIOGetBufferSize(min_b_size, max_b_size, pref_b_size, grans);
asio_result!(result)
}
}
/// Creates the buffers.
/// Needs to be atleast Loaded.
/// If Running or Prepared then old buffers
/// will be destoryed.
unsafe fn asio_create_buffers(
&mut self,
buffer_info_convert: *mut ai::ASIOBufferInfo, num_channels: i32, pref_b_size: c_long,
callbacks_convert: &mut ai::ASIOCallbacks,
&mut self, buffer_info_convert: *mut ai::ASIOBufferInfo, num_channels: i32,
pref_b_size: c_long, callbacks_convert: &mut ai::ASIOCallbacks,
) -> Result<(), AsioError> {
use AsioState::*;
match self.state {
Offline | Loaded => return Err(AsioError::NoDrivers),
Running => {
self.asio_stop().expect("Asio failed to stop");
self.asio_dispose_buffers().expect("Failed to dispose buffers");
self.asio_dispose_buffers()
.expect("Failed to dispose buffers");
self.state = Initialized;
},
Prepared => {
self.asio_dispose_buffers().expect("Failed to dispose buffers");
self.asio_dispose_buffers()
.expect("Failed to dispose buffers");
self.state = Initialized;
},
_ => (),
@ -626,10 +793,12 @@ unsafe fn asio_create_buffers(
pref_b_size,
callbacks_convert,
);
asio_result!(result)
.map(|_| self.state = AsioState::Prepared)
asio_result!(result).map(|_| self.state = AsioState::Prepared)
}
/// Releases buffers allocations.
/// Needs to be atleast Loaded.
/// No op if already released.
unsafe fn asio_dispose_buffers(&mut self) -> Result<(), AsioError> {
use AsioState::*;
match self.state {
@ -638,10 +807,11 @@ unsafe fn asio_dispose_buffers(&mut self) -> Result<(), AsioError> {
Initialized => return Ok(()),
}
let result = ai::ASIODisposeBuffers();
asio_result!(result)
.map(|_| self.state = AsioState::Initialized)
asio_result!(result).map(|_| self.state = AsioState::Initialized)
}
/// Closes down ASIO.
/// Needs to be atleast Loaded.
unsafe fn asio_exit(&mut self) -> Result<(), AsioError> {
use AsioState::*;
match self.state {
@ -649,10 +819,11 @@ unsafe fn asio_exit(&mut self) -> Result<(), AsioError> {
_ => (),
}
let result = ai::ASIOExit();
asio_result!(result)
.map(|_| self.state = AsioState::Offline)
asio_result!(result).map(|_| self.state = AsioState::Offline)
}
/// Starts ASIO streams playing.
/// Needs to be atleast Initialized.
unsafe fn asio_start(&mut self) -> Result<(), AsioError> {
use AsioState::*;
match self.state {
@ -661,10 +832,12 @@ unsafe fn asio_start(&mut self) -> Result<(), AsioError> {
Prepared => (),
}
let result = ai::ASIOStart();
asio_result!(result)
.map(|_| self.state = AsioState::Running)
asio_result!(result).map(|_| self.state = AsioState::Running)
}
/// Stops ASIO streams playing.
/// Needs to be Running.
/// No-op if already stopped.
unsafe fn asio_stop(&mut self) -> Result<(), AsioError> {
use AsioState::*;
match self.state {
@ -673,10 +846,11 @@ unsafe fn asio_stop(&mut self) -> Result<(), AsioError> {
Initialized | Prepared => return Ok(()),
}
let result = ai::ASIOStop();
asio_result!(result)
.map(|_| self.state = AsioState::Prepared)
asio_result!(result).map(|_| self.state = AsioState::Prepared)
}
/// Cleans up the drivers based
/// on the current state of the driver.
fn clean_up(&mut self) {
match self.state {
AsioState::Offline => (),
@ -696,7 +870,8 @@ fn clean_up(&mut self) {
},
AsioState::Prepared => {
unsafe {
self.asio_dispose_buffers().expect("Failed to dispose buffers");
self.asio_dispose_buffers()
.expect("Failed to dispose buffers");
self.asio_exit().expect("Failed to exit asio");
self.unload();
}
@ -705,7 +880,8 @@ fn clean_up(&mut self) {
AsioState::Running => {
unsafe {
self.asio_stop().expect("Asio failed to stop");
self.asio_dispose_buffers().expect("Failed to dispose buffers");
self.asio_dispose_buffers()
.expect("Failed to dispose buffers");
self.asio_exit().expect("Failed to exit asio");
self.unload();
}