gstreamer-rs/gstreamer-app/src/app_sink.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 ffi;
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use glib::translate::*;
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use glib_ffi::gpointer;
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use gst;
use gst_ffi;
use std::cell::RefCell;
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use std::ptr;
use AppSink;
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#[cfg_attr(feature = "cargo-clippy", allow(type_complexity))]
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pub struct AppSinkCallbacks {
eos: Option<RefCell<Box<FnMut(&AppSink) + Send + 'static>>>,
new_preroll: Option<RefCell<Box<FnMut(&AppSink) -> gst::FlowReturn + Send + 'static>>>,
new_sample: Option<RefCell<Box<FnMut(&AppSink) -> gst::FlowReturn + Send + 'static>>>,
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callbacks: ffi::GstAppSinkCallbacks,
}
unsafe impl Send for AppSinkCallbacks {}
unsafe impl Sync for AppSinkCallbacks {}
impl AppSinkCallbacks {
pub fn new() -> AppSinkCallbacksBuilder {
skip_assert_initialized!();
AppSinkCallbacksBuilder {
eos: None,
new_preroll: None,
new_sample: None,
}
}
}
#[cfg_attr(feature = "cargo-clippy", allow(type_complexity))]
pub struct AppSinkCallbacksBuilder {
eos: Option<RefCell<Box<FnMut(&AppSink) + Send + 'static>>>,
new_preroll: Option<RefCell<Box<FnMut(&AppSink) -> gst::FlowReturn + Send + 'static>>>,
new_sample: Option<RefCell<Box<FnMut(&AppSink) -> gst::FlowReturn + Send + 'static>>>,
}
impl AppSinkCallbacksBuilder {
pub fn eos<F: Fn(&AppSink) + Send + Sync + 'static>(self, eos: F) -> Self {
Self {
eos: Some(RefCell::new(Box::new(eos))),
..self
}
}
pub fn new_preroll<F: Fn(&AppSink) -> gst::FlowReturn + Send + Sync + 'static>(
self,
new_preroll: F,
) -> Self {
Self {
new_preroll: Some(RefCell::new(Box::new(new_preroll))),
..self
}
}
pub fn new_sample<F: Fn(&AppSink) -> gst::FlowReturn + Send + Sync + 'static>(
self,
new_sample: F,
) -> Self {
Self {
new_sample: Some(RefCell::new(Box::new(new_sample))),
..self
}
}
pub fn build(self) -> AppSinkCallbacks {
let have_eos = self.eos.is_some();
let have_new_preroll = self.new_preroll.is_some();
let have_new_sample = self.new_sample.is_some();
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AppSinkCallbacks {
eos: self.eos,
new_preroll: self.new_preroll,
new_sample: self.new_sample,
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callbacks: ffi::GstAppSinkCallbacks {
eos: if have_eos { Some(trampoline_eos) } else { None },
new_preroll: if have_new_preroll {
Some(trampoline_new_preroll)
} else {
None
},
new_sample: if have_new_sample {
Some(trampoline_new_sample)
} else {
None
},
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_gst_reserved: [
ptr::null_mut(),
ptr::null_mut(),
ptr::null_mut(),
ptr::null_mut(),
],
},
}
}
}
unsafe extern "C" fn trampoline_eos(appsink: *mut ffi::GstAppSink, callbacks: gpointer) {
let callbacks = &*(callbacks as *const AppSinkCallbacks);
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if let Some(ref eos) = callbacks.eos {
(&mut *eos.borrow_mut())(&from_glib_borrow(appsink))
}
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}
unsafe extern "C" fn trampoline_new_preroll(
appsink: *mut ffi::GstAppSink,
callbacks: gpointer,
) -> gst_ffi::GstFlowReturn {
let callbacks = &*(callbacks as *const AppSinkCallbacks);
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let ret = if let Some(ref new_preroll) = callbacks.new_preroll {
(&mut *new_preroll.borrow_mut())(&from_glib_borrow(appsink))
} else {
gst::FlowReturn::Error
};
ret.to_glib()
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}
unsafe extern "C" fn trampoline_new_sample(
appsink: *mut ffi::GstAppSink,
callbacks: gpointer,
) -> gst_ffi::GstFlowReturn {
let callbacks = &*(callbacks as *const AppSinkCallbacks);
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let ret = if let Some(ref new_sample) = callbacks.new_sample {
(&mut *new_sample.borrow_mut())(&from_glib_borrow(appsink))
} else {
gst::FlowReturn::Error
};
ret.to_glib()
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}
unsafe extern "C" fn destroy_callbacks(ptr: gpointer) {
Box::<AppSinkCallbacks>::from_raw(ptr as *mut _);
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}
impl AppSink {
pub fn set_callbacks(&self, callbacks: AppSinkCallbacks) {
unsafe {
ffi::gst_app_sink_set_callbacks(
self.to_glib_none().0,
mut_override(&callbacks.callbacks),
Box::into_raw(Box::new(callbacks)) as *mut _,
Some(destroy_callbacks),
);
}
}
}