gstreamer_base/subclass/
aggregator_pad.rs

1// Take a look at the license at the top of the repository in the LICENSE file.
2
3use glib::{prelude::*, translate::*};
4use gst::subclass::prelude::*;
5
6use crate::{Aggregator, AggregatorPad, ffi};
7
8pub trait AggregatorPadImpl: PadImpl + ObjectSubclass<Type: IsA<AggregatorPad>> {
9    /// Optional
10    ///  Called when the pad has received a flush stop, this is the place
11    ///  to flush any information specific to the pad, it allows for individual
12    ///  pads to be flushed while others might not be.
13    fn flush(&self, aggregator: &Aggregator) -> Result<gst::FlowSuccess, gst::FlowError> {
14        self.parent_flush(aggregator)
15    }
16
17    /// Optional
18    ///  Called before input buffers are queued in the pad, return [`true`]
19    ///  if the buffer should be skipped.
20    fn skip_buffer(&self, aggregator: &Aggregator, buffer: &gst::Buffer) -> bool {
21        self.parent_skip_buffer(aggregator, buffer)
22    }
23}
24
25pub trait AggregatorPadImplExt: AggregatorPadImpl {
26    fn parent_flush(&self, aggregator: &Aggregator) -> Result<gst::FlowSuccess, gst::FlowError> {
27        unsafe {
28            let data = Self::type_data();
29            let parent_class = data.as_ref().parent_class() as *mut ffi::GstAggregatorPadClass;
30            (*parent_class)
31                .flush
32                .map(|f| {
33                    try_from_glib(f(
34                        self.obj()
35                            .unsafe_cast_ref::<AggregatorPad>()
36                            .to_glib_none()
37                            .0,
38                        aggregator.to_glib_none().0,
39                    ))
40                })
41                .unwrap_or(Ok(gst::FlowSuccess::Ok))
42        }
43    }
44
45    fn parent_skip_buffer(&self, aggregator: &Aggregator, buffer: &gst::Buffer) -> bool {
46        unsafe {
47            let data = Self::type_data();
48            let parent_class = data.as_ref().parent_class() as *mut ffi::GstAggregatorPadClass;
49            (*parent_class)
50                .skip_buffer
51                .map(|f| {
52                    from_glib(f(
53                        self.obj()
54                            .unsafe_cast_ref::<AggregatorPad>()
55                            .to_glib_none()
56                            .0,
57                        aggregator.to_glib_none().0,
58                        buffer.to_glib_none().0,
59                    ))
60                })
61                .unwrap_or(false)
62        }
63    }
64}
65
66impl<T: AggregatorPadImpl> AggregatorPadImplExt for T {}
67unsafe impl<T: AggregatorPadImpl> IsSubclassable<T> for AggregatorPad {
68    fn class_init(klass: &mut glib::Class<Self>) {
69        Self::parent_class_init::<T>(klass);
70        let klass = klass.as_mut();
71        klass.flush = Some(aggregator_pad_flush::<T>);
72        klass.skip_buffer = Some(aggregator_pad_skip_buffer::<T>);
73    }
74}
75
76unsafe extern "C" fn aggregator_pad_flush<T: AggregatorPadImpl>(
77    ptr: *mut ffi::GstAggregatorPad,
78    aggregator: *mut ffi::GstAggregator,
79) -> gst::ffi::GstFlowReturn {
80    unsafe {
81        let instance = &*(ptr as *mut T::Instance);
82        let imp = instance.imp();
83
84        gst::pad_panic_to_error!(imp, gst::FlowReturn::Error, {
85            let res: gst::FlowReturn = imp.flush(&from_glib_borrow(aggregator)).into();
86            res
87        })
88        .into_glib()
89    }
90}
91
92unsafe extern "C" fn aggregator_pad_skip_buffer<T: AggregatorPadImpl>(
93    ptr: *mut ffi::GstAggregatorPad,
94    aggregator: *mut ffi::GstAggregator,
95    buffer: *mut gst::ffi::GstBuffer,
96) -> glib::ffi::gboolean {
97    unsafe {
98        let instance = &*(ptr as *mut T::Instance);
99        let imp = instance.imp();
100
101        gst::pad_panic_to_error!(imp, false, {
102            imp.skip_buffer(&from_glib_borrow(aggregator), &from_glib_borrow(buffer))
103        })
104        .into_glib()
105    }
106}
gstreamer_base/subclass/aggregator_pad.rs

gstreamer_base/subclass/
aggregator_pad.rs
