gstreamer 0.25.1

Rust bindings for GStreamer
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

// Take a look at the license at the top of the repository in the LICENSE file.

use std::{
    fmt,
    ops::{Bound, RangeBounds},
};

pub trait ByteSliceExt {
    #[doc(alias = "gst_util_dump_mem")]
    fn dump(&self) -> Dump<'_>;
    #[doc(alias = "gst_util_dump_mem")]
    fn dump_range(&self, range: impl RangeBounds<usize>) -> Dump<'_>;
}

impl<T: AsRef<[u8]>> ByteSliceExt for T {
    fn dump(&self) -> Dump<'_> {
        self.dump_range(..)
    }

    fn dump_range(&self, range: impl RangeBounds<usize>) -> Dump<'_> {
        Dump {
            data: self.as_ref(),
            start: range.start_bound().cloned(),
            end: range.end_bound().cloned(),
        }
    }
}

pub struct Dump<'a> {
    pub(crate) data: &'a [u8],
    pub(crate) start: Bound<usize>,
    pub(crate) end: Bound<usize>,
}

impl Dump<'_> {
    fn fmt(&self, f: &mut fmt::Formatter, debug: bool) -> fmt::Result {
        use std::fmt::Write;

        let data = self.data;
        let len = data.len();

        // Kind of re-implementation of slice indexing to allow handling out of range values better
        // with specific output strings
        let mut start_idx = match self.start {
            Bound::Included(idx) if idx >= len => {
                write!(f, "<start out of range>")?;
                return Ok(());
            }
            Bound::Excluded(idx) if idx.checked_add(1).is_none_or(|idx| idx >= len) => {
                write!(f, "<start out of range>")?;
                return Ok(());
            }
            Bound::Included(idx) => idx,
            Bound::Excluded(idx) => idx + 1,
            Bound::Unbounded => 0,
        };

        let end_idx = match self.end {
            Bound::Included(idx) if idx.checked_add(1).is_none_or(|idx| idx > len) => {
                write!(f, "<end out of range>")?;
                return Ok(());
            }
            Bound::Excluded(idx) if idx > len => {
                write!(f, "<end out of range>")?;
                return Ok(());
            }
            Bound::Included(idx) => idx + 1,
            Bound::Excluded(idx) => idx,
            Bound::Unbounded => len,
        };

        if start_idx >= end_idx {
            write!(f, "<empty range>")?;
            return Ok(());
        }

        let data = &data[start_idx..end_idx];

        if debug {
            for line in data.chunks(16) {
                match end_idx {
                    0x00_00..=0xff_ff => write!(f, "{start_idx:04x}:  ")?,
                    0x01_00_00..=0xff_ff_ff => write!(f, "{start_idx:06x}:  ")?,
                    0x01_00_00_00..=0xff_ff_ff_ff => write!(f, "{start_idx:08x}:  ")?,
                    _ => write!(f, "{start_idx:016x}:  ")?,
                }

                for (i, v) in line.iter().enumerate() {
                    if i > 0 {
                        write!(f, " {v:02x}")?;
                    } else {
                        write!(f, "{v:02x}")?;
                    }
                }

                for _ in line.len()..16 {
                    write!(f, "   ")?;
                }
                write!(f, "   ")?;

                for v in line {
                    if v.is_ascii() && !v.is_ascii_control() {
                        f.write_char((*v).into())?;
                    } else {
                        f.write_char('.')?;
                    }
                }

                start_idx = start_idx.saturating_add(16);
                if start_idx < end_idx {
                    writeln!(f)?;
                }
            }

            Ok(())
        } else {
            for line in data.chunks(16) {
                for (i, v) in line.iter().enumerate() {
                    if i > 0 {
                        write!(f, " {v:02x}")?;
                    } else {
                        write!(f, "{v:02x}")?;
                    }
                }

                start_idx = start_idx.saturating_add(16);
                if start_idx < end_idx {
                    writeln!(f)?;
                }
            }

            Ok(())
        }
    }
}

impl fmt::Display for Dump<'_> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        self.fmt(f, false)
    }
}

impl fmt::Debug for Dump<'_> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        self.fmt(f, true)
    }
}

#[cfg(test)]
mod tests {
    use super::ByteSliceExt;

    #[test]
    fn dump_u8_slice() {
        let mut b: [u8; 4] = [1u8, 2, 3, 4];
        let _ = b.dump();
        let b1 = b.as_slice();
        let _ = b1.dump();
        let b1 = b.as_mut_slice();
        let _ = b1.dump();
    }

    #[test]
    fn dump_u8_vec() {
        let mut b = vec![1u8, 2, 3, 4];
        let _ = b.dump();
        let b1 = b.as_slice();
        let _ = b1.dump();
        let b1 = b.as_mut_slice();
        let _ = b1.dump();
    }
}