ffmpeg 0.3.0

Safe FFmpeg wrapper
Documentation 
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

use std::ops::Deref;

use super::codec::Codec;
use ffi::*;
use {format, Rational};

#[derive(PartialEq, Eq, Copy, Clone)]
pub struct Video {
    codec: Codec,
}

impl Video {
    pub unsafe fn new(codec: Codec) -> Video {
        Video { codec: codec }
    }
}

impl Video {
    pub fn rates(&self) -> Option<RateIter> {
        unsafe {
            if (*self.codec.as_ptr()).supported_framerates.is_null() {
                None
            } else {
                Some(RateIter::new((*self.codec.as_ptr()).supported_framerates))
            }
        }
    }

    pub fn formats(&self) -> Option<FormatIter> {
        unsafe {
            if (*self.codec.as_ptr()).pix_fmts.is_null() {
                None
            } else {
                Some(FormatIter::new((*self.codec.as_ptr()).pix_fmts))
            }
        }
    }
}

impl Deref for Video {
    type Target = Codec;

    fn deref(&self) -> &Self::Target {
        &self.codec
    }
}

pub struct RateIter {
    ptr: *const AVRational,
}

impl RateIter {
    pub fn new(ptr: *const AVRational) -> Self {
        RateIter { ptr: ptr }
    }
}

impl Iterator for RateIter {
    type Item = Rational;

    fn next(&mut self) -> Option<<Self as Iterator>::Item> {
        unsafe {
            if (*self.ptr).num == 0 && (*self.ptr).den == 0 {
                return None;
            }

            let rate = (*self.ptr).into();
            self.ptr = self.ptr.offset(1);

            Some(rate)
        }
    }
}

pub struct FormatIter {
    ptr: *const AVPixelFormat,
}

impl FormatIter {
    pub fn new(ptr: *const AVPixelFormat) -> Self {
        FormatIter { ptr: ptr }
    }
}

impl Iterator for FormatIter {
    type Item = format::Pixel;

    fn next(&mut self) -> Option<<Self as Iterator>::Item> {
        unsafe {
            if *self.ptr == AVPixelFormat::AV_PIX_FMT_NONE {
                return None;
            }

            let format = (*self.ptr).into();
            self.ptr = self.ptr.offset(1);

            Some(format)
        }
    }
}