gstreamer-rs/gstreamer/src/stream_collection.rs

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// 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 glib::object::IsA;
use glib::translate::*;
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use gst_sys;
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use Stream;
use StreamCollection;
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#[derive(Debug)]
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pub struct Iter<'a> {
collection: &'a StreamCollection,
idx: u32,
size: u32,
}
impl<'a> Iter<'a> {
fn new(collection: &'a StreamCollection) -> Iter<'a> {
skip_assert_initialized!();
Iter {
collection,
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idx: 0,
size: collection.len() as u32,
}
}
}
impl<'a> Iterator for Iter<'a> {
type Item = Stream;
fn next(&mut self) -> Option<Self::Item> {
if self.idx >= self.size {
return None;
}
let item = self.collection.get_stream(self.idx);
self.idx += 1;
item
}
fn size_hint(&self) -> (usize, Option<usize>) {
if self.idx == self.size {
return (0, Some(0));
}
let remaining = (self.size - self.idx) as usize;
(remaining, Some(remaining))
}
}
impl<'a> DoubleEndedIterator for Iter<'a> {
fn next_back(&mut self) -> Option<Self::Item> {
if self.idx == self.size {
return None;
}
self.size -= 1;
self.collection.get_stream(self.size)
}
}
impl<'a> ExactSizeIterator for Iter<'a> {}
impl StreamCollection {
pub fn new(upstream_id: Option<&str>) -> StreamCollection {
assert_initialized_main_thread!();
let upstream_id = upstream_id.to_glib_none();
let (major, minor, _, _) = ::version();
if (major, minor) > (1, 12) {
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unsafe { from_glib_full(gst_sys::gst_stream_collection_new(upstream_id.0)) }
} else {
// Work-around for 1.14 switching from transfer-floating to transfer-full
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unsafe { from_glib_none(gst_sys::gst_stream_collection_new(upstream_id.0)) }
}
}
#[cfg(any(feature = "v1_10", feature = "dox"))]
pub fn add_stream<P: IsA<Stream>>(&self, stream: &P) {
unsafe {
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gst_sys::gst_stream_collection_add_stream(
self.to_glib_none().0,
stream.as_ref().to_glib_full(),
);
}
}
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pub fn iter(&self) -> Iter {
Iter::new(self)
}
pub fn len(&self) -> usize {
self.get_size() as usize
}
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pub fn is_empty(&self) -> bool {
self.len() == 0
}
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}