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
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
// Take a look at the license at the top of the repository in the LICENSE file.

use std::{fmt, marker::PhantomData, ptr};

use glib::translate::*;

use crate::{ffi, BaseParse, BaseParseFrameFlags};

/// Frame (context) data passed to each frame parsing virtual methods. In
/// addition to providing the data to be checked for a valid frame or an already
/// identified frame, it conveys additional metadata or control information
/// from and to the subclass w.r.t. the particular frame in question (rather
/// than global parameters). Some of these may apply to each parsing stage, others
/// only to some a particular one. These parameters are effectively zeroed at start
/// of each frame's processing, i.e. parsing virtual method invocation sequence.
pub struct BaseParseFrame<'a>(
    ptr::NonNull<ffi::GstBaseParseFrame>,
    PhantomData<&'a BaseParse>,
);

unsafe impl<'a> Send for BaseParseFrame<'a> {}
unsafe impl<'a> Sync for BaseParseFrame<'a> {}

#[derive(Debug)]
pub enum Overhead {
    None,
    Frame,
    Bytes(u32),
}

#[doc(hidden)]
impl IntoGlib for Overhead {
    type GlibType = i32;

    #[inline]
    fn into_glib(self) -> i32 {
        match self {
            Self::None => 0,
            Self::Frame => -1,
            Self::Bytes(b) => i32::try_from(b).expect("overhead is higher than i32::MAX"),
        }
    }
}

impl FromGlib<i32> for Overhead {
    #[inline]
    unsafe fn from_glib(val: i32) -> Self {
        skip_assert_initialized!();
        match val {
            0 => Self::None,
            1 => Self::Frame,
            b if b > 0 => Self::Bytes(val as u32),
            _ => panic!("overheader is lower than -1"),
        }
    }
}

#[doc(hidden)]
impl<'a> ::glib::translate::ToGlibPtr<'a, *mut ffi::GstBaseParseFrame> for BaseParseFrame<'a> {
    type Storage = PhantomData<&'a Self>;

    #[inline]
    fn to_glib_none(&'a self) -> ::glib::translate::Stash<*mut ffi::GstBaseParseFrame, Self> {
        Stash(self.0.as_ptr(), PhantomData)
    }

    fn to_glib_full(&self) -> *mut ffi::GstBaseParseFrame {
        unimplemented!()
    }
}

impl<'a> fmt::Debug for BaseParseFrame<'a> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        let mut b = f.debug_struct("BaseParseFrame");

        b.field("buffer", &self.buffer())
            .field("output_buffer", &self.output_buffer())
            .field("flags", &self.flags())
            .field("offset", &self.offset())
            .field("overhead", &self.overhead());

        b.finish()
    }
}

impl<'a> BaseParseFrame<'a> {
    #[inline]
    pub(crate) unsafe fn new(frame: *mut ffi::GstBaseParseFrame, _parse: &'a BaseParse) -> Self {
        skip_assert_initialized!();
        debug_assert!(!frame.is_null());
        Self(ptr::NonNull::new_unchecked(frame), PhantomData)
    }

    #[doc(alias = "get_buffer")]
    #[inline]
    pub fn buffer(&self) -> Option<&gst::BufferRef> {
        unsafe {
            let ptr = (*self.to_glib_none().0).buffer;
            if ptr.is_null() {
                None
            } else {
                Some(gst::BufferRef::from_ptr(ptr))
            }
        }
    }

    #[doc(alias = "get_buffer_mut")]
    pub fn buffer_mut(&mut self) -> Option<&mut gst::BufferRef> {
        unsafe {
            let ptr = (*self.to_glib_none().0).buffer;
            if ptr.is_null() {
                None
            } else {
                let writable: bool = from_glib(gst::ffi::gst_mini_object_is_writable(
                    ptr as *const gst::ffi::GstMiniObject,
                ));
                assert!(writable);

                Some(gst::BufferRef::from_mut_ptr(ptr))
            }
        }
    }

    #[doc(alias = "get_output_buffer")]
    #[inline]
    pub fn output_buffer(&self) -> Option<&gst::BufferRef> {
        unsafe {
            let ptr = (*self.to_glib_none().0).out_buffer;
            if ptr.is_null() {
                None
            } else {
                Some(gst::BufferRef::from_ptr(ptr))
            }
        }
    }

    #[doc(alias = "get_output_buffer_mut")]
    pub fn output_buffer_mut(&mut self) -> Option<&mut gst::BufferRef> {
        unsafe {
            let ptr = (*self.to_glib_none().0).out_buffer;
            if ptr.is_null() {
                None
            } else {
                let writable: bool = from_glib(gst::ffi::gst_mini_object_is_writable(
                    ptr as *const gst::ffi::GstMiniObject,
                ));
                assert!(writable);

                Some(gst::BufferRef::from_mut_ptr(ptr))
            }
        }
    }

    pub fn set_output_buffer(&mut self, output_buffer: gst::Buffer) {
        unsafe {
            assert!(output_buffer.is_writable());
            let prev = (*self.to_glib_none().0).out_buffer;

            if !prev.is_null() {
                gst::ffi::gst_mini_object_unref(prev as *mut gst::ffi::GstMiniObject);
            }

            (*self.to_glib_none().0).out_buffer = output_buffer.into_glib_ptr();
        }
    }

    #[doc(alias = "get_flags")]
    #[inline]
    pub fn flags(&self) -> BaseParseFrameFlags {
        let flags = unsafe { (*self.to_glib_none().0).flags };
        BaseParseFrameFlags::from_bits_truncate(flags)
    }

    #[inline]
    pub fn set_flags(&mut self, flags: BaseParseFrameFlags) {
        unsafe { (*self.to_glib_none().0).flags |= flags.bits() }
    }

    #[inline]
    pub fn unset_flags(&mut self, flags: BaseParseFrameFlags) {
        unsafe { (*self.to_glib_none().0).flags &= !flags.bits() }
    }

    #[doc(alias = "get_offset")]
    #[inline]
    pub fn offset(&self) -> u64 {
        unsafe { (*self.to_glib_none().0).offset }
    }

    #[doc(alias = "get_overhead")]
    #[inline]
    pub fn overhead(&self) -> Overhead {
        unsafe { from_glib((*self.to_glib_none().0).overhead) }
    }

    #[inline]
    pub fn set_overhead(&mut self, overhead: Overhead) {
        unsafe {
            (*self.to_glib_none().0).overhead = overhead.into_glib();
        }
    }
}