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pub mod flag;
pub use self::flag::Flags;

pub mod pad;
pub use self::pad::Pad;

pub mod filter;
pub use self::filter::Filter;

pub mod context;
pub use self::context::{Context, Sink, Source};

pub mod graph;
pub use self::graph::Graph;

use std::ffi::{CStr, CString};
use std::str::from_utf8_unchecked;

use ffi::*;
use Error;

pub fn register_all() {
    unsafe {
        avfilter_register_all();
    }
}

pub fn register(filter: &Filter) -> Result<(), Error> {
    unsafe {
        match avfilter_register(filter.as_ptr() as *mut _) {
            0 => Ok(()),
            _ => Err(Error::InvalidData),
        }
    }
}

pub fn version() -> u32 {
    unsafe { avfilter_version() }
}

pub fn configuration() -> &'static str {
    unsafe { from_utf8_unchecked(CStr::from_ptr(avfilter_configuration()).to_bytes()) }
}

pub fn license() -> &'static str {
    unsafe { from_utf8_unchecked(CStr::from_ptr(avfilter_license()).to_bytes()) }
}

pub fn find(name: &str) -> Option<Filter> {
    unsafe {
        let name = CString::new(name).unwrap();
        let ptr = avfilter_get_by_name(name.as_ptr());

        if ptr.is_null() {
            None
        } else {
            Some(Filter::wrap(ptr as *mut _))
        }
    }
}