gstreamer-rs/gstreamer-pbutils/src/discoverer_stream_info.rs

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// Copyright (C) 2018 Thiago Santos <thiagossantos@gmail.com>
// 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 crate::DiscovererStreamInfo;
use crate::DiscovererStreamInfoExt;
#[derive(Debug)]
pub struct Iter {
stream_info: Option<DiscovererStreamInfo>,
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direction_forward: bool,
}
impl Iterator for Iter {
type Item = DiscovererStreamInfo;
fn next(&mut self) -> Option<DiscovererStreamInfo> {
let current = self.stream_info.take();
self.stream_info = match current {
Some(ref c) => {
// Decide on the direction
if self.direction_forward {
c.get_next()
} else {
c.get_previous()
}
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}
None => None,
};
current
}
}
impl DiscovererStreamInfo {
pub fn next_iter(&self) -> Iter {
Iter {
stream_info: self.get_next(),
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direction_forward: true,
}
}
pub fn previous_iter(&self) -> Iter {
Iter {
stream_info: self.get_previous(),
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direction_forward: false,
}
}
}