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use core_foundation_sys::base::OSStatus;
use coremidi_sys::{
ItemCount, MIDIEndpointDispose, MIDIGetNumberOfSources, MIDIGetSource, MIDIReceived,
};
use std::ops::Deref;
use crate::object::Object;
use crate::packets::PacketList;
use super::Endpoint;
/// A [MIDI source](https://developer.apple.com/reference/coremidi/midiendpointref) owned by an entity.
///
/// A source can be created from an index like this:
///
/// ```rust,no_run
/// let source = coremidi::Source::from_index(0).unwrap();
/// println!("The source at index 0 has display name '{}'", source.display_name().unwrap());
/// ```
///
#[derive(Debug)]
pub struct Source {
endpoint: Endpoint,
}
impl Source {
/// Create a source endpoint from its index.
///
pub fn from_index(index: usize) -> Option<Source> {
let endpoint_ref = unsafe { MIDIGetSource(index as ItemCount) };
match endpoint_ref {
0 => None,
_ => Some(Source {
endpoint: Endpoint {
object: Object(endpoint_ref),
},
}),
}
}
}
impl Deref for Source {
type Target = Endpoint;
fn deref(&self) -> &Endpoint {
&self.endpoint
}
}
/// Source endpoints available in the system.
///
/// The number of sources available in the system can be retrieved with:
///
/// ```rust,no_run
/// let number_of_sources = coremidi::Sources::count();
/// ```
///
/// The sources in the system can be iterated as:
///
/// ```rust,no_run
/// for source in coremidi::Sources {
/// println!("{}", source.display_name().unwrap());
/// }
/// ```
///
pub struct Sources;
impl Sources {
/// Get the number of sources available in the system for receiving MIDI messages.
/// See [MIDIGetNumberOfSources](https://developer.apple.com/reference/coremidi/1495116-midigetnumberofsources).
///
pub fn count() -> usize {
unsafe { MIDIGetNumberOfSources() as usize }
}
}
impl IntoIterator for Sources {
type Item = Source;
type IntoIter = SourcesIterator;
fn into_iter(self) -> Self::IntoIter {
SourcesIterator {
index: 0,
count: Self::count(),
}
}
}
pub struct SourcesIterator {
index: usize,
count: usize,
}
impl Iterator for SourcesIterator {
type Item = Source;
fn next(&mut self) -> Option<Source> {
if self.index < self.count {
let source = Source::from_index(self.index);
self.index += 1;
source
} else {
None
}
}
}
/// A [MIDI virtual source](https://developer.apple.com/reference/coremidi/1495212-midisourcecreate) owned by a client.
///
/// A virtual source can be created like:
///
/// ```rust,no_run
/// let client = coremidi::Client::new("example-client").unwrap();
/// let source = client.virtual_source("example-source").unwrap();
/// ```
///
#[derive(Debug)]
pub struct VirtualSource {
pub(crate) endpoint: Endpoint,
}
impl VirtualSource {
/// Distributes incoming MIDI from a source to the client input ports which are connected to that source.
///
pub fn received(&self, packet_list: &PacketList) -> Result<(), OSStatus> {
let status = unsafe { MIDIReceived(self.endpoint.object.0, packet_list.as_ptr()) };
if status == 0 {
Ok(())
} else {
Err(status)
}
}
}
impl Deref for VirtualSource {
type Target = Endpoint;
fn deref(&self) -> &Endpoint {
&self.endpoint
}
}
impl Drop for VirtualSource {
fn drop(&mut self) {
unsafe { MIDIEndpointDispose(self.endpoint.object.0) };
}
}