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, Source, Sink};

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

use std::ffi::{CString, CStr};
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()) {
			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))
		}
	}
}