gstreamer-rs/gstreamer/src/clock.rs

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// Copyright (C) 2017 Sebastian Dröge <sebastian@centricular.com>
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use Clock;
use ClockTime;
use ClockTimeDiff;
use ClockReturn;
use std::mem;
use std::cmp;
use std::ptr;
use std::mem::transmute;
use ffi;
use glib;
use glib::IsA;
use glib::translate::*;
use glib::source::CallbackGuard;
use glib_ffi;
use glib_ffi::{gboolean, gpointer};
use libc::c_void;
glib_wrapper! {
pub struct ClockId(Shared<c_void>);
match fn {
ref => |ptr| ffi::gst_clock_id_ref(ptr),
unref => |ptr| ffi::gst_clock_id_unref(ptr),
}
}
unsafe extern "C" fn trampoline_wait_async(
clock: *mut ffi::GstClock,
time: ClockTime,
id: gpointer,
func: gpointer,
) -> gboolean {
let _guard = CallbackGuard::new();
let f: &&(Fn(&Clock, ClockTime, &ClockId) -> bool + Send + 'static) = transmute(func);
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f(&from_glib_borrow(clock), time, &from_glib_borrow(id)).to_glib()
}
unsafe extern "C" fn destroy_closure_wait_async(ptr: gpointer) {
let _guard = CallbackGuard::new();
Box::<Box<Fn(&Clock, ClockTime, &ClockId) -> bool + Send + 'static>>::from_raw(ptr as *mut _);
}
fn into_raw_wait_async<F: Fn(&Clock, ClockTime, &ClockId) -> bool + Send + 'static>(
func: F,
) -> gpointer {
let func: Box<Box<Fn(&Clock, ClockTime, &ClockId) -> bool + Send + 'static>> =
Box::new(Box::new(func));
Box::into_raw(func) as gpointer
}
impl ClockId {
pub fn get_time(&self) -> ClockTime {
unsafe { ffi::gst_clock_id_get_time(self.to_glib_none().0) }
}
pub fn unschedule(&self) {
unsafe { ffi::gst_clock_id_unschedule(self.to_glib_none().0) }
}
pub fn wait(&self) -> (ClockReturn, ClockTimeDiff) {
unsafe {
let mut jitter = mem::uninitialized();
let res = ffi::gst_clock_id_wait(self.to_glib_none().0, &mut jitter);
(from_glib(res), jitter)
}
}
pub fn wait_async<F>(&self, func: F) -> ClockReturn
where
F: Fn(&Clock, ClockTime, &ClockId) -> bool + Send + 'static,
{
unsafe {
from_glib(ffi::gst_clock_id_wait_async(
self.to_glib_none().0,
Some(trampoline_wait_async),
into_raw_wait_async(func),
Some(destroy_closure_wait_async),
))
}
}
}
impl PartialOrd for ClockId {
fn partial_cmp(&self, other: &Self) -> Option<cmp::Ordering> {
Some(self.cmp(other))
}
}
impl Ord for ClockId {
fn cmp(&self, other: &Self) -> cmp::Ordering {
unsafe {
let res = ffi::gst_clock_id_compare_func(self.to_glib_none().0, other.to_glib_none().0);
if res < 0 {
cmp::Ordering::Less
} else if res > 0 {
cmp::Ordering::Greater
} else {
cmp::Ordering::Equal
}
}
}
}
impl PartialEq for ClockId {
fn eq(&self, other: &Self) -> bool {
self.cmp(other) == cmp::Ordering::Equal
}
}
impl Eq for ClockId {}
unsafe impl Send for ClockId {}
unsafe impl Sync for ClockId {}
pub trait ClockExtManual {
fn new_periodic_id(&self, start_time: ClockTime, interval: ClockTime) -> Option<ClockId>;
fn periodic_id_reinit(
&self,
id: &ClockId,
start_time: ClockTime,
interval: ClockTime,
) -> Result<(), glib::BoolError>;
fn new_single_shot_id(&self, time: ClockTime) -> Option<ClockId>;
fn single_shot_id_reinit(&self, id: &ClockId, time: ClockTime) -> Result<(), glib::BoolError>;
}
impl<O: IsA<Clock> + IsA<glib::object::Object>> ClockExtManual for O {
fn new_periodic_id(&self, start_time: ClockTime, interval: ClockTime) -> Option<ClockId> {
unsafe {
from_glib_full(ffi::gst_clock_new_periodic_id(
self.to_glib_none().0,
start_time,
interval,
))
}
}
fn periodic_id_reinit(
&self,
id: &ClockId,
start_time: ClockTime,
interval: ClockTime,
) -> Result<(), glib::BoolError> {
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skip_assert_initialized!();
unsafe {
let res: bool = from_glib(ffi::gst_clock_periodic_id_reinit(
self.to_glib_none().0,
id.to_glib_none().0,
start_time,
interval,
));
if res {
Ok(())
} else {
Err(glib::BoolError("Failed to reinit periodic clock id"))
}
}
}
fn new_single_shot_id(&self, time: ClockTime) -> Option<ClockId> {
unsafe {
from_glib_full(ffi::gst_clock_new_single_shot_id(
self.to_glib_none().0,
time,
))
}
}
fn single_shot_id_reinit(&self, id: &ClockId, time: ClockTime) -> Result<(), glib::BoolError> {
unsafe {
let res: bool = from_glib(ffi::gst_clock_single_shot_id_reinit(
self.to_glib_none().0,
id.to_glib_none().0,
time,
));
if res {
Ok(())
} else {
Err(glib::BoolError("Failed to reinit single shot clock id"))
}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use super::super::*;
use std::sync::mpsc::channel;
#[test]
fn test_wait() {
::init().unwrap();
let clock = SystemClock::obtain();
let now = clock.get_time();
let id = clock.new_single_shot_id(now + 20_000_000).unwrap();
let (res, _) = id.wait();
assert!(res == ClockReturn::Ok || res == ClockReturn::Early);
}
#[test]
fn test_wait_async() {
::init().unwrap();
let (sender, receiver) = channel();
let clock = SystemClock::obtain();
let now = clock.get_time();
let id = clock.new_single_shot_id(now + 20_000_000).unwrap();
let res = id.wait_async(move |_, _, _| {
sender.send(()).unwrap();
true
});
assert!(res == ClockReturn::Ok);
assert_eq!(receiver.recv(), Ok(()));
}
}