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use glib_sys;
use gst_sys;
use gst_video_sys;
use glib;
use glib::translate::{from_glib_full, ToGlib, ToGlibPtr};
use gst;
use std::mem;
use std::ptr;
pub fn convert_sample(
sample: &gst::Sample,
caps: &gst::Caps,
timeout: gst::ClockTime,
) -> Result<gst::Sample, glib::Error> {
unsafe {
let mut error = ptr::null_mut();
let ret = gst_video_sys::gst_video_convert_sample(
sample.to_glib_none().0,
caps.to_glib_none().0,
timeout.to_glib(),
&mut error,
);
if error.is_null() {
Ok(from_glib_full(ret))
} else {
Err(from_glib_full(error))
}
}
}
pub fn convert_sample_async<F>(
sample: &gst::Sample,
caps: &gst::Caps,
timeout: gst::ClockTime,
func: F,
) where
F: FnOnce(Result<gst::Sample, glib::Error>) + Send + 'static,
{
unsafe { convert_sample_async_unsafe(sample, caps, timeout, func) }
}
pub fn convert_sample_async_local<F>(
sample: &gst::Sample,
caps: &gst::Caps,
timeout: gst::ClockTime,
func: F,
) where
F: FnOnce(Result<gst::Sample, glib::Error>) + Send + 'static,
{
unsafe {
assert!(glib::MainContext::ref_thread_default().is_owner());
convert_sample_async_unsafe(sample, caps, timeout, func)
}
}
unsafe fn convert_sample_async_unsafe<F>(
sample: &gst::Sample,
caps: &gst::Caps,
timeout: gst::ClockTime,
func: F,
) where
F: FnOnce(Result<gst::Sample, glib::Error>) + 'static,
{
unsafe extern "C" fn convert_sample_async_trampoline<F>(
sample: *mut gst_sys::GstSample,
error: *mut glib_sys::GError,
user_data: glib_sys::gpointer,
) where
F: FnOnce(Result<gst::Sample, glib::Error>) + 'static,
{
let callback: &mut Option<F> = &mut *(user_data as *mut Option<F>);
let callback = callback.take().unwrap();
if error.is_null() {
callback(Ok(from_glib_full(sample)))
} else {
callback(Err(from_glib_full(error)))
}
}
unsafe extern "C" fn convert_sample_async_free<F>(user_data: glib_sys::gpointer)
where
F: FnOnce(Result<gst::Sample, glib::Error>) + 'static,
{
let _: Box<Option<F>> = Box::from_raw(user_data as *mut _);
}
let user_data: Box<Option<F>> = Box::new(Some(func));
gst_video_sys::gst_video_convert_sample_async(
sample.to_glib_none().0,
caps.to_glib_none().0,
timeout.to_glib(),
Some(convert_sample_async_trampoline::<F>),
Box::into_raw(user_data) as glib_sys::gpointer,
Some(mem::transmute(convert_sample_async_free::<F> as usize)),
);
}
pub fn convert_sample_future(
sample: &gst::Sample,
caps: &gst::Caps,
timeout: gst::ClockTime,
) -> std::pin::Pin<Box<dyn std::future::Future<Output = Result<gst::Sample, glib::Error>> + 'static>>
{
use futures_channel::oneshot;
use futures_util::future::lazy;
use futures_util::future::FutureExt;
let (sender, receiver) = oneshot::channel();
let sample = sample.clone();
let caps = caps.clone();
let future = lazy(move |_| {
assert!(
glib::MainContext::ref_thread_default().is_owner(),
"Spawning futures only allowed if the thread is owning the MainContext"
);
convert_sample_async(&sample, &caps, timeout, move |res| {
let _ = sender.send(res);
});
})
.then(|_| receiver.map(|res| res.expect("Sender dropped before callback was called")));
Box::pin(future)
}
#[cfg(test)]
mod tests {
use super::*;
use glib;
use gst;
use std::sync::{Arc, Mutex};
#[test]
fn test_convert_sample_async() {
gst::init().unwrap();
let l = glib::MainLoop::new(None, false);
let mut in_buffer = gst::Buffer::with_size(320 * 240 * 4).unwrap();
{
let buffer = in_buffer.get_mut().unwrap();
let mut data = buffer.map_writable().unwrap();
for p in data.as_mut_slice().chunks_mut(4) {
p[0] = 63;
p[1] = 127;
p[2] = 191;
p[3] = 255;
}
}
let in_caps = ::VideoInfo::new(::VideoFormat::Rgba, 320, 240)
.build()
.unwrap()
.to_caps()
.unwrap();
let sample = gst::Sample::new().buffer(&in_buffer).caps(&in_caps).build();
let out_caps = ::VideoInfo::new(::VideoFormat::Abgr, 320, 240)
.build()
.unwrap()
.to_caps()
.unwrap();
let l_clone = l.clone();
let res_store = Arc::new(Mutex::new(None));
let res_store_clone = res_store.clone();
convert_sample_async(&sample, &out_caps, gst::CLOCK_TIME_NONE, move |res| {
*res_store_clone.lock().unwrap() = Some(res);
l_clone.quit();
});
l.run();
let res = res_store.lock().unwrap().take().unwrap();
let res = res.unwrap();
let converted_out_caps = res.get_caps().unwrap();
assert_eq!(out_caps.as_ref(), converted_out_caps);
let out_buffer = res.get_buffer().unwrap();
{
let data = out_buffer.map_readable().unwrap();
for p in data.as_slice().chunks(4) {
assert_eq!(p, &[255, 191, 127, 63]);
}
}
}
}