gstreamer-rs/gstreamer/src/element.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 Element;
use glib;
use glib::IsA;
use glib::translate::{from_glib, from_glib_none, FromGlibPtrContainer, ToGlibPtr};
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use QueryRef;
use Event;
use PadTemplate;
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use miniobject::MiniObject;
use std::ffi::CStr;
use ffi;
use gobject_ffi;
impl Element {
pub fn link_many<E: IsA<Element>>(elements: &[&E]) -> Result<(), glib::BoolError> {
for (e1, e2) in elements.iter().zip(elements.iter().skip(1)) {
unsafe {
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let ret: bool = from_glib(ffi::gst_element_link(
e1.to_glib_none().0,
e2.to_glib_none().0,
));
if !ret {
return Err(glib::BoolError("Failed to link elements"));
}
}
}
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Ok(())
}
pub fn unlink_many<E: IsA<Element>>(elements: &[&E]) {
for (e1, e2) in elements.iter().zip(elements.iter().skip(1)) {
unsafe {
ffi::gst_element_unlink(e1.to_glib_none().0, e2.to_glib_none().0);
}
}
}
}
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pub trait ElementExtManual {
fn query(&self, query: &mut QueryRef) -> bool;
fn send_event(&self, event: Event) -> bool;
fn get_metadata(&self, key: &str) -> Option<&'static str>;
fn get_pad_template(&self, name: &str) -> Option<PadTemplate>;
fn get_pad_template_list(&self) -> Vec<PadTemplate>;
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}
impl<O: IsA<Element>> ElementExtManual for O {
fn query(&self, query: &mut QueryRef) -> bool {
unsafe {
from_glib(ffi::gst_element_query(
self.to_glib_none().0,
query.as_mut_ptr(),
))
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}
}
fn send_event(&self, event: Event) -> bool {
unsafe {
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from_glib(ffi::gst_element_send_event(
self.to_glib_none().0,
event.into_ptr(),
))
}
}
fn get_metadata(&self, key: &str) -> Option<&'static str> {
unsafe {
let klass = (*(self.to_glib_none().0 as *mut gobject_ffi::GTypeInstance)).g_class as
*mut ffi::GstElementClass;
let ptr = ffi::gst_element_class_get_metadata(klass, key.to_glib_none().0);
if ptr.is_null() {
None
} else {
Some(CStr::from_ptr(ptr).to_str().unwrap())
}
}
}
fn get_pad_template(&self, name: &str) -> Option<PadTemplate> {
unsafe {
let klass = (*(self.to_glib_none().0 as *mut gobject_ffi::GTypeInstance)).g_class as
*mut ffi::GstElementClass;
from_glib_none(ffi::gst_element_class_get_pad_template(
klass,
name.to_glib_none().0,
))
}
}
fn get_pad_template_list(&self) -> Vec<PadTemplate> {
unsafe {
let klass = (*(self.to_glib_none().0 as *mut gobject_ffi::GTypeInstance)).g_class as
*mut ffi::GstElementClass;
FromGlibPtrContainer::from_glib_none(
ffi::gst_element_class_get_pad_template_list(klass),
)
}
}
}
lazy_static!{
pub static ref ELEMENT_METADATA_AUTHOR: &'static str = unsafe { CStr::from_ptr(ffi::GST_ELEMENT_METADATA_AUTHOR).to_str().unwrap() };
pub static ref ELEMENT_METADATA_DESCRIPTION: &'static str = unsafe { CStr::from_ptr(ffi::GST_ELEMENT_METADATA_DESCRIPTION).to_str().unwrap() };
pub static ref ELEMENT_METADATA_DOC_URI: &'static str = unsafe { CStr::from_ptr(ffi::GST_ELEMENT_METADATA_DOC_URI).to_str().unwrap() };
pub static ref ELEMENT_METADATA_ICON_NAME: &'static str = unsafe { CStr::from_ptr(ffi::GST_ELEMENT_METADATA_ICON_NAME).to_str().unwrap() };
pub static ref ELEMENT_METADATA_KLASS: &'static str = unsafe { CStr::from_ptr(ffi::GST_ELEMENT_METADATA_KLASS).to_str().unwrap() };
pub static ref ELEMENT_METADATA_LONGNAME: &'static str = unsafe { CStr::from_ptr(ffi::GST_ELEMENT_METADATA_LONGNAME).to_str().unwrap() };
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}