ffmpeg_the_third/software/scaling/
vector.rs

1use std::marker::PhantomData;
2use std::slice;
3
4use crate::ffi::*;
5use libc::{c_double, c_int};
6
7pub struct Vector<'a> {
8    ptr: *mut SwsVector,
9
10    _own: bool,
11    _marker: PhantomData<&'a ()>,
12}
13
14impl<'a> Vector<'a> {
15    pub unsafe fn wrap(ptr: *mut SwsVector) -> Self {
16        Vector {
17            ptr,
18            _own: false,
19            _marker: PhantomData,
20        }
21    }
22
23    pub unsafe fn as_ptr(&self) -> *const SwsVector {
24        self.ptr as *const _
25    }
26
27    pub unsafe fn as_mut_ptr(&mut self) -> *mut SwsVector {
28        self.ptr
29    }
30}
31
32impl<'a> Vector<'a> {
33    pub fn new(length: usize) -> Self {
34        unsafe {
35            Vector {
36                ptr: sws_allocVec(length as c_int),
37                _own: true,
38                _marker: PhantomData,
39            }
40        }
41    }
42
43    pub fn gaussian(variance: f64, quality: f64) -> Self {
44        unsafe {
45            Vector {
46                ptr: sws_getGaussianVec(variance as c_double, quality as c_double),
47                _own: true,
48                _marker: PhantomData,
49            }
50        }
51    }
52
53    pub fn scale(&mut self, scalar: f64) {
54        unsafe {
55            sws_scaleVec(self.as_mut_ptr(), scalar as c_double);
56        }
57    }
58
59    pub fn normalize(&mut self, height: f64) {
60        unsafe {
61            sws_normalizeVec(self.as_mut_ptr(), height as c_double);
62        }
63    }
64
65    pub fn coefficients(&self) -> &[f64] {
66        unsafe { slice::from_raw_parts((*self.as_ptr()).coeff, (*self.as_ptr()).length as usize) }
67    }
68
69    pub fn coefficients_mut(&self) -> &[f64] {
70        unsafe {
71            slice::from_raw_parts_mut((*self.as_ptr()).coeff, (*self.as_ptr()).length as usize)
72        }
73    }
74}
75
76impl<'a> Drop for Vector<'a> {
77    fn drop(&mut self) {
78        unsafe {
79            if self._own {
80                sws_freeVec(self.as_mut_ptr());
81            }
82        }
83    }
84}
ffmpeg_the_third/software/scaling/vector.rs

ffmpeg_the_third/software/scaling/
vector.rs
