vsd 0.2.5

Download video streams served over HTTP from websites, HLS and DASH playlists
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

use std::io::{Cursor, Read};
use super::{TFHD, TRUN, Sample};

#[derive(Default, Clone)]
pub(super) struct Reader {
    pub(super) cursor: Cursor<Vec<u8>>,
}

impl Reader {
    pub(super) fn has_more_data(&self) -> bool {
        (self.cursor.position() as usize) < self.cursor.clone().into_inner().len()
    }

    pub(super) fn get_length(&self) -> usize {
        self.cursor.clone().into_inner().len()
    }

    pub(super) fn get_position(&self) -> usize {
        self.cursor.position() as usize
    }

    pub(super) fn read_bytes(&mut self, size: usize) -> Vec<u8> {
        let mut buf = Vec::with_capacity(size);

        for _ in 0..size {
            let mut buf2 = [0; 1];
            self.cursor.read_exact(&mut buf2).unwrap();
            buf.push(buf2[0]);
        }

        buf
    }

    pub(super) fn read_i32(&mut self) -> i32 {
        let mut buf = [0; 4];
        self.cursor.read_exact(&mut buf).unwrap();
        i32::from_be_bytes(buf)
    }

    pub(super) fn read_u32(&mut self) -> u32 {
        let mut buf = [0; 4];
        self.cursor.read_exact(&mut buf).unwrap();
        u32::from_be_bytes(buf)
    }

    pub(super) fn read_u64(&mut self) -> u64 {
        let mut buf = [0; 8];
        self.cursor.read_exact(&mut buf).unwrap();
        u64::from_be_bytes(buf)
    }

    pub(super) fn parse_mdhd(&mut self, version: u32) -> u32 {
        if version == 1 {
            self.read_bytes(8);
            self.read_bytes(8);
        } else {
            self.read_bytes(4);
            self.read_bytes(4);
        }

        self.read_u32()
    }

    pub(super) fn parse_tfdt(&mut self, version: u32) -> u64 {
        if version == 1 {
            self.read_u64()
        } else {
            self.read_u32() as u64
        }
    }

    pub(super) fn parse_tfhd(&mut self, flags: u32) -> TFHD {
        let track_id = self.read_u32();
        let mut default_sample_duration = 0_u32;
        let mut default_sample_size = 0_u32;

        if (flags & 0x000001) != 0 {
            self.read_bytes(8);
        }

        if (flags & 0x000002) != 0 {
            self.read_bytes(4);
        }

        if (flags & 0x000008) != 0 {
            default_sample_duration = self.read_u32();
        }

        if (flags & 0x000010) != 0 {
            default_sample_size = self.read_u32();
        }

        TFHD {
            track_id,
            default_sample_duration,
            default_sample_size,
        }
    }

    pub(super) fn parse_trun(&mut self, version: u32, flags: u32) -> TRUN {
        let mut trun = TRUN {
            sample_count: self.read_u32(),
            sample_data: vec![],
        };

        if (flags & 0x000001) != 0 {
            self.read_bytes(4);
        }

        if (flags & 0x000004) != 0 {
            self.read_bytes(4);
        }

        for _ in 0..trun.sample_count {
            let mut sample = Sample::default();

            if (flags & 0x000100) != 0 {
                sample.sample_duration = self.read_u32();
            }

            if (flags & 0x000200) != 0 {
                sample.sample_size = self.read_u32();
            }

            if (flags & 0x000400) != 0 {
                self.read_bytes(4);
            }

            if (flags & 0x000800) != 0 {
                sample.sample_composition_time_offset = if version == 0 {
                    self.read_u32()
                } else {
                    self.read_i32() as u32
                };
            }

            trun.sample_data.push(sample);
        }

        trun
    }
}