ac_ffmpeg_features/
lib.rs

1use std::{
2    ffi::CStr,
3    os::raw::{c_char, c_void},
4};
5
6type FeatureCallback = unsafe extern "C" fn(ctx: *mut c_void, feature: *const c_char);
7
8extern "C" {
9    fn get_ffmpeg_features(ctx: *mut c_void, all: u8, cb: FeatureCallback);
10}
11
12/// Get FFmpeg features.
13///
14/// # Arguments
15/// * `all` - if `true` all features will be returned; otherwise, only the
16///   features actually provided by the libraries will be returned
17pub fn ffmpeg_features(all: bool) -> Vec<String> {
18    let mut res = Vec::new();
19
20    unsafe {
21        get_ffmpeg_features(&mut res as *mut Vec<String> as _, all as _, push_feature);
22    }
23
24    res
25}
26
27/// Native feature callback.
28unsafe extern "C" fn push_feature(ctx: *mut c_void, feature: *const c_char) {
29    let features = &mut *(ctx as *mut Vec<String>);
30
31    let feature = CStr::from_ptr(feature).to_str().map(String::from);
32
33    if let Ok(f) = feature {
34        features.push(f);
35    }
36}
ac_ffmpeg_features/lib.rs

ac_ffmpeg_features/
lib.rs
