gstreamer-rs/gstreamer/src/bin.rs

// Copyright (C) 2017 Sebastian Dröge <sebastian@centricular.com>
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use Bin;
use Element;

use glib;
use glib::IsA;
use glib::translate::{ToGlibPtr, from_glib};

use ffi;

pub trait BinExtManual {
    fn add_many<E: IsA<Element>>(&self, elements: &[&E]) -> Result<(), glib::BoolError>;
    fn remove_many<E: IsA<Element>>(&self, elements: &[&E]) -> Result<(), glib::BoolError>;
}

impl<O: IsA<Bin>> BinExtManual for O {
    fn add_many<E: IsA<Element>>(&self, elements: &[&E]) -> Result<(), glib::BoolError> {
        for e in elements {
            unsafe {
                let ret: bool =
                    from_glib(ffi::gst_bin_add(self.to_glib_none().0, e.to_glib_none().0));
                if !ret {
                    return Err(glib::BoolError("Failed to add elements"));
                }
            }
        }

        return Ok(());
    }

    fn remove_many<E: IsA<Element>>(&self, elements: &[&E]) -> Result<(), glib::BoolError> {
        for e in elements {
            unsafe {
                let ret: bool = from_glib(ffi::gst_bin_remove(
                    self.to_glib_none().0,
                    e.to_glib_none().0,
                ));
                if !ret {
                    return Err(glib::BoolError("Failed to add elements"));
                }
            }
        }

        return Ok(());
    }
}