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// Copyright © 2017 Mozilla Foundation
//
// This program is made available under an ISC-style license. See the
// accompanying file LICENSE for details
#![warn(unused_extern_crates)]
#[macro_use]
extern crate error_chain;
#[macro_use]
extern crate log;
use audio_thread_priority::promote_current_thread_to_real_time;
use audioipc::core;
use audioipc::framing::framed;
use audioipc::rpc;
use audioipc::{MessageStream, PlatformHandle, PlatformHandleType};
use futures::sync::oneshot;
use futures::Future;
use once_cell::sync::Lazy;
use std::ffi::{CStr, CString};
use std::os::raw::c_void;
use std::ptr;
use std::sync::Mutex;
use tokio::reactor;
mod server;
struct CubebContextParams {
context_name: CString,
backend_name: Option<CString>,
}
static G_CUBEB_CONTEXT_PARAMS: Lazy<Mutex<CubebContextParams>> = Lazy::new(|| {
Mutex::new(CubebContextParams {
context_name: CString::new("AudioIPC Server").unwrap(),
backend_name: None,
})
});
#[allow(deprecated)]
pub mod errors {
#![allow(clippy::upper_case_acronyms)]
error_chain! {
links {
AudioIPC(::audioipc::errors::Error, ::audioipc::errors::ErrorKind);
}
foreign_links {
Cubeb(cubeb_core::Error);
Io(::std::io::Error);
Canceled(::futures::sync::oneshot::Canceled);
}
}
}
use crate::errors::*;
struct ServerWrapper {
core_thread: core::CoreThread,
callback_thread: core::CoreThread,
}
fn register_thread(callback: Option<extern "C" fn(*const ::std::os::raw::c_char)>) {
if let Some(func) = callback {
let thr = std::thread::current();
let name = CString::new(thr.name().unwrap()).unwrap();
func(name.as_ptr());
}
}
fn unregister_thread(callback: Option<extern "C" fn()>) {
if let Some(func) = callback {
func();
}
}
fn init_threads(
thread_create_callback: Option<extern "C" fn(*const ::std::os::raw::c_char)>,
thread_destroy_callback: Option<extern "C" fn()>,
) -> Result<ServerWrapper> {
trace!("Starting up cubeb audio server event loop thread...");
let callback_thread = core::spawn_thread(
"AudioIPC Callback RPC",
move || {
match promote_current_thread_to_real_time(0, 48000) {
Ok(_) => {}
Err(_) => {
debug!("Failed to promote audio callback thread to real-time.");
}
}
register_thread(thread_create_callback);
trace!("Starting up cubeb audio callback event loop thread...");
Ok(())
},
move || {
unregister_thread(thread_destroy_callback);
},
)
.map_err(|e| {
debug!(
"Failed to start cubeb audio callback event loop thread: {:?}",
e
);
e
})?;
let core_thread = core::spawn_thread(
"AudioIPC Server RPC",
move || {
register_thread(thread_create_callback);
audioipc::server_platform_init();
Ok(())
},
move || {
unregister_thread(thread_destroy_callback);
},
)
.map_err(|e| {
debug!("Failed to cubeb audio core event loop thread: {:?}", e);
e
})?;
Ok(ServerWrapper {
core_thread,
callback_thread,
})
}
#[repr(C)]
#[derive(Clone, Copy, Debug)]
pub struct AudioIpcServerInitParams {
// Fields only need to be public for ipctest.
pub thread_create_callback: Option<extern "C" fn(*const ::std::os::raw::c_char)>,
pub thread_destroy_callback: Option<extern "C" fn()>,
}
#[allow(clippy::missing_safety_doc)]
#[no_mangle]
pub unsafe extern "C" fn audioipc_server_start(
context_name: *const std::os::raw::c_char,
backend_name: *const std::os::raw::c_char,
init_params: *const AudioIpcServerInitParams,
) -> *mut c_void {
assert!(!init_params.is_null());
let mut params = G_CUBEB_CONTEXT_PARAMS.lock().unwrap();
if !context_name.is_null() {
params.context_name = CStr::from_ptr(context_name).to_owned();
}
if !backend_name.is_null() {
let backend_string = CStr::from_ptr(backend_name).to_owned();
params.backend_name = Some(backend_string);
}
match init_threads(
(*init_params).thread_create_callback,
(*init_params).thread_destroy_callback,
) {
Ok(server) => Box::into_raw(Box::new(server)) as *mut _,
Err(_) => ptr::null_mut() as *mut _,
}
}
// A `shm_area_size` of 0 allows the server to calculate an appropriate shm size for each stream.
// A non-zero `shm_area_size` forces all allocations to the specified size.
#[no_mangle]
pub extern "C" fn audioipc_server_new_client(
p: *mut c_void,
shm_area_size: usize,
) -> PlatformHandleType {
let (wait_tx, wait_rx) = oneshot::channel();
let wrapper: &ServerWrapper = unsafe { &*(p as *mut _) };
let callback_thread_handle = wrapper.callback_thread.handle();
// We create a connected pair of anonymous IPC endpoints. One side
// is registered with the reactor core, the other side is returned
// to the caller.
MessageStream::anonymous_ipc_pair()
.map(|(ipc_server, ipc_client)| {
// Spawn closure to run on same thread as reactor::Core
// via remote handle.
wrapper
.core_thread
.handle()
.spawn(futures::future::lazy(move || {
trace!("Incoming connection");
let handle = reactor::Handle::default();
ipc_server.into_tokio_ipc(&handle)
.map(|sock| {
let transport = framed(sock, Default::default());
rpc::bind_server(transport, server::CubebServer::new(callback_thread_handle, shm_area_size));
}).map_err(|_| ())
// Notify waiting thread that server has been registered.
.and_then(|_| wait_tx.send(()))
}))
.expect("Failed to spawn CubebServer");
// Wait for notification that server has been registered
// with reactor::Core.
let _ = wait_rx.wait();
unsafe { PlatformHandle::from(ipc_client).into_raw() }
})
.unwrap_or(audioipc::INVALID_HANDLE_VALUE)
}
#[no_mangle]
pub extern "C" fn audioipc_server_stop(p: *mut c_void) {
let wrapper = unsafe { Box::<ServerWrapper>::from_raw(p as *mut _) };
drop(wrapper);
}
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