1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
// Take a look at the license at the top of the repository in the LICENSE file.

use crate::BaseTransform;
use glib::prelude::*;
use glib::translate::*;
use std::mem;
use std::ptr;

pub trait BaseTransformExtManual: 'static {
    /// Lets [`BaseTransform`][crate::BaseTransform] sub-classes know the memory `allocator`
    /// used by the base class and its `params`.
    ///
    /// Unref the `allocator` after use.
    ///
    /// # Returns
    ///
    ///
    /// ## `allocator`
    /// the [`gst::Allocator`][crate::gst::Allocator]
    /// used
    ///
    /// ## `params`
    /// the [`gst::AllocationParams`][crate::gst::AllocationParams] of `allocator`
    #[doc(alias = "get_allocator")]
    #[doc(alias = "gst_base_transform_get_allocator")]
    fn allocator(&self) -> (Option<gst::Allocator>, gst::AllocationParams);

    #[doc(alias = "get_segment")]
    fn segment(&self) -> gst::Segment;

    fn sink_pad(&self) -> &gst::Pad;

    fn src_pad(&self) -> &gst::Pad;
}

impl<O: IsA<BaseTransform>> BaseTransformExtManual for O {
    fn allocator(&self) -> (Option<gst::Allocator>, gst::AllocationParams) {
        unsafe {
            let mut allocator = ptr::null_mut();
            let mut params = mem::zeroed();
            ffi::gst_base_transform_get_allocator(
                self.as_ref().to_glib_none().0,
                &mut allocator,
                &mut params,
            );
            (from_glib_full(allocator), params.into())
        }
    }

    fn segment(&self) -> gst::Segment {
        unsafe {
            let trans: &ffi::GstBaseTransform = &*(self.as_ptr() as *const _);
            let _guard = crate::utils::MutexGuard::lock(&trans.element.object.lock);
            from_glib_none(&trans.segment as *const _)
        }
    }

    fn sink_pad(&self) -> &gst::Pad {
        unsafe {
            let elt = &*(self.as_ptr() as *const ffi::GstBaseTransform);
            &*(&elt.sinkpad as *const *mut gst::ffi::GstPad as *const gst::Pad)
        }
    }

    fn src_pad(&self) -> &gst::Pad {
        unsafe {
            let elt = &*(self.as_ptr() as *const ffi::GstBaseTransform);
            &*(&elt.srcpad as *const *mut gst::ffi::GstPad as *const gst::Pad)
        }
    }
}