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)
        }
    }
}