gstreamer-rs/gstreamer/src/caps_features.rs

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// Copyright (C) 2018 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 std::borrow::{Borrow, BorrowMut, ToOwned};
use std::ffi::CStr;
use std::fmt;
use std::marker::PhantomData;
use std::mem;
use std::ops::{Deref, DerefMut};
use std::ptr;
use std::str;
use glib;
use glib::translate::{
from_glib, from_glib_full, from_glib_none, FromGlibPtrFull, FromGlibPtrNone, GlibPtrDefault,
Stash, StashMut, ToGlibPtr, ToGlibPtrMut,
};
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use glib_sys::gpointer;
use gobject_sys;
use gst_sys;
pub struct CapsFeatures(ptr::NonNull<CapsFeaturesRef>, PhantomData<CapsFeaturesRef>);
unsafe impl Send for CapsFeatures {}
unsafe impl Sync for CapsFeatures {}
impl CapsFeatures {
pub fn new(features: &[&str]) -> Self {
let mut f = Self::new_empty();
for feature in features {
f.add(feature);
}
f
}
pub fn new_empty() -> Self {
assert_initialized_main_thread!();
unsafe {
CapsFeatures(
ptr::NonNull::new_unchecked(
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gst_sys::gst_caps_features_new_empty() as *mut CapsFeaturesRef
),
PhantomData,
)
}
}
pub fn new_any() -> Self {
assert_initialized_main_thread!();
unsafe {
CapsFeatures(
ptr::NonNull::new_unchecked(
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gst_sys::gst_caps_features_new_any() as *mut CapsFeaturesRef
),
PhantomData,
)
}
}
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pub unsafe fn into_ptr(self) -> *mut gst_sys::GstCapsFeatures {
let ptr = self.0.as_ptr() as *mut CapsFeaturesRef as *mut gst_sys::GstCapsFeatures;
mem::forget(self);
ptr
}
}
impl Deref for CapsFeatures {
type Target = CapsFeaturesRef;
fn deref(&self) -> &CapsFeaturesRef {
unsafe { self.0.as_ref() }
}
}
impl DerefMut for CapsFeatures {
fn deref_mut(&mut self) -> &mut CapsFeaturesRef {
unsafe { self.0.as_mut() }
}
}
impl AsRef<CapsFeaturesRef> for CapsFeatures {
fn as_ref(&self) -> &CapsFeaturesRef {
self.deref()
}
}
impl AsMut<CapsFeaturesRef> for CapsFeatures {
fn as_mut(&mut self) -> &mut CapsFeaturesRef {
self.deref_mut()
}
}
impl Clone for CapsFeatures {
fn clone(&self) -> Self {
unsafe {
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let ptr = gst_sys::gst_caps_features_copy(&self.0.as_ref().0) as *mut CapsFeaturesRef;
assert!(!ptr.is_null());
CapsFeatures(ptr::NonNull::new_unchecked(ptr), PhantomData)
}
}
}
impl Drop for CapsFeatures {
fn drop(&mut self) {
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unsafe { gst_sys::gst_caps_features_free(&mut self.0.as_mut().0) }
}
}
impl fmt::Debug for CapsFeatures {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_tuple("CapsFeatures")
.field(&self.to_string())
.finish()
}
}
impl fmt::Display for CapsFeatures {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
// Need to make sure to not call ToString::to_string() here, which
// we have because of the Display impl. We need CapsFeaturesRef::to_string()
f.write_str(&CapsFeaturesRef::to_string(self.as_ref()))
}
}
impl str::FromStr for CapsFeatures {
type Err = ();
fn from_str(s: &str) -> Result<Self, ()> {
assert_initialized_main_thread!();
unsafe {
let ptr = gst_sys::gst_caps_features_from_string(s.to_glib_none().0);
if ptr.is_null() {
return Err(());
}
Ok(CapsFeatures(
ptr::NonNull::new_unchecked(ptr as *mut CapsFeaturesRef),
PhantomData,
))
}
}
}
impl Borrow<CapsFeaturesRef> for CapsFeatures {
fn borrow(&self) -> &CapsFeaturesRef {
unsafe { self.0.as_ref() }
}
}
impl BorrowMut<CapsFeaturesRef> for CapsFeatures {
fn borrow_mut(&mut self) -> &mut CapsFeaturesRef {
unsafe { self.0.as_mut() }
}
}
impl glib::types::StaticType for CapsFeatures {
fn static_type() -> glib::types::Type {
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unsafe { from_glib(gst_sys::gst_caps_features_get_type()) }
}
}
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impl<'a> ToGlibPtr<'a, *const gst_sys::GstCapsFeatures> for CapsFeatures {
type Storage = &'a Self;
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fn to_glib_none(&'a self) -> Stash<'a, *const gst_sys::GstCapsFeatures, Self> {
unsafe { Stash(&self.0.as_ref().0, self) }
}
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fn to_glib_full(&self) -> *const gst_sys::GstCapsFeatures {
unsafe { gst_sys::gst_caps_features_copy(&self.0.as_ref().0) }
}
}
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impl<'a> ToGlibPtr<'a, *mut gst_sys::GstCapsFeatures> for CapsFeatures {
type Storage = &'a Self;
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fn to_glib_none(&'a self) -> Stash<'a, *mut gst_sys::GstCapsFeatures, Self> {
unsafe { Stash(&self.0.as_ref().0 as *const _ as *mut _, self) }
}
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fn to_glib_full(&self) -> *mut gst_sys::GstCapsFeatures {
unsafe { gst_sys::gst_caps_features_copy(&self.0.as_ref().0) }
}
}
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impl<'a> ToGlibPtrMut<'a, *mut gst_sys::GstCapsFeatures> for CapsFeatures {
type Storage = &'a mut Self;
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fn to_glib_none_mut(&'a mut self) -> StashMut<*mut gst_sys::GstCapsFeatures, Self> {
unsafe { StashMut(&mut self.0.as_mut().0, self) }
}
}
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impl FromGlibPtrNone<*const gst_sys::GstCapsFeatures> for CapsFeatures {
unsafe fn from_glib_none(ptr: *const gst_sys::GstCapsFeatures) -> Self {
assert!(!ptr.is_null());
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let ptr = gst_sys::gst_caps_features_copy(ptr);
assert!(!ptr.is_null());
CapsFeatures(
ptr::NonNull::new_unchecked(ptr as *mut CapsFeaturesRef),
PhantomData,
)
}
}
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impl FromGlibPtrNone<*mut gst_sys::GstCapsFeatures> for CapsFeatures {
unsafe fn from_glib_none(ptr: *mut gst_sys::GstCapsFeatures) -> Self {
assert!(!ptr.is_null());
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let ptr = gst_sys::gst_caps_features_copy(ptr);
assert!(!ptr.is_null());
CapsFeatures(
ptr::NonNull::new_unchecked(ptr as *mut CapsFeaturesRef),
PhantomData,
)
}
}
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impl FromGlibPtrFull<*const gst_sys::GstCapsFeatures> for CapsFeatures {
unsafe fn from_glib_full(ptr: *const gst_sys::GstCapsFeatures) -> Self {
assert!(!ptr.is_null());
CapsFeatures(
ptr::NonNull::new_unchecked(ptr as *mut CapsFeaturesRef),
PhantomData,
)
}
}
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impl FromGlibPtrFull<*mut gst_sys::GstCapsFeatures> for CapsFeatures {
unsafe fn from_glib_full(ptr: *mut gst_sys::GstCapsFeatures) -> Self {
assert!(!ptr.is_null());
CapsFeatures(
ptr::NonNull::new_unchecked(ptr as *mut CapsFeaturesRef),
PhantomData,
)
}
}
impl<'a> glib::value::FromValueOptional<'a> for CapsFeatures {
unsafe fn from_value_optional(v: &'a glib::Value) -> Option<Self> {
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let ptr = gobject_sys::g_value_get_boxed(v.to_glib_none().0);
from_glib_none(ptr as *const gst_sys::GstCapsFeatures)
}
}
impl glib::value::SetValue for CapsFeatures {
unsafe fn set_value(v: &mut glib::Value, s: &Self) {
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gobject_sys::g_value_set_boxed(v.to_glib_none_mut().0, s.0.as_ptr() as gpointer);
}
}
impl glib::value::SetValueOptional for CapsFeatures {
unsafe fn set_value_optional(v: &mut glib::Value, s: Option<&Self>) {
if let Some(s) = s {
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gobject_sys::g_value_set_boxed(v.to_glib_none_mut().0, s.as_ptr() as gpointer);
} else {
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gobject_sys::g_value_set_boxed(v.to_glib_none_mut().0, ptr::null_mut());
}
}
}
impl GlibPtrDefault for CapsFeatures {
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type GlibType = *mut gst_sys::GstCapsFeatures;
}
#[repr(C)]
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pub struct CapsFeaturesRef(gst_sys::GstCapsFeatures);
impl CapsFeaturesRef {
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pub unsafe fn from_glib_borrow<'a>(
ptr: *const gst_sys::GstCapsFeatures,
) -> &'a CapsFeaturesRef {
assert!(!ptr.is_null());
&*(ptr as *mut CapsFeaturesRef)
}
pub unsafe fn from_glib_borrow_mut<'a>(
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ptr: *mut gst_sys::GstCapsFeatures,
) -> &'a mut CapsFeaturesRef {
assert!(!ptr.is_null());
&mut *(ptr as *mut CapsFeaturesRef)
}
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pub unsafe fn as_ptr(&self) -> *const gst_sys::GstCapsFeatures {
self as *const Self as *const gst_sys::GstCapsFeatures
}
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pub unsafe fn as_mut_ptr(&self) -> *mut gst_sys::GstCapsFeatures {
self as *const Self as *mut gst_sys::GstCapsFeatures
}
pub fn is_empty(&self) -> bool {
self.get_size() == 0 && !self.is_any()
}
pub fn is_any(&self) -> bool {
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unsafe { from_glib(gst_sys::gst_caps_features_is_any(self.as_ptr())) }
}
pub fn contains(&self, feature: &str) -> bool {
unsafe {
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from_glib(gst_sys::gst_caps_features_contains(
self.as_ptr(),
feature.to_glib_none().0,
))
}
}
pub fn get_size(&self) -> u32 {
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unsafe { gst_sys::gst_caps_features_get_size(self.as_ptr()) }
}
pub fn get_nth(&self, idx: u32) -> Option<&str> {
if idx >= self.get_size() {
return None;
}
unsafe {
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let feature = gst_sys::gst_caps_features_get_nth(self.as_ptr(), idx);
if feature.is_null() {
return None;
}
Some(CStr::from_ptr(feature).to_str().unwrap())
}
}
pub fn add(&mut self, feature: &str) {
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unsafe { gst_sys::gst_caps_features_add(self.as_mut_ptr(), feature.to_glib_none().0) }
}
pub fn remove(&mut self, feature: &str) {
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unsafe { gst_sys::gst_caps_features_remove(self.as_mut_ptr(), feature.to_glib_none().0) }
}
pub fn iter(&self) -> Iter {
Iter::new(self)
}
// This is not an equivalence relation with regards to ANY. Everything is equal to ANY
pub fn is_equal(&self, other: &CapsFeaturesRef) -> bool {
unsafe {
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from_glib(gst_sys::gst_caps_features_is_equal(
self.as_ptr(),
other.as_ptr(),
))
}
}
}
#[derive(Debug)]
pub struct Iter<'a> {
caps_features: &'a CapsFeaturesRef,
idx: u32,
n_features: u32,
}
impl<'a> Iter<'a> {
fn new(caps_features: &'a CapsFeaturesRef) -> Iter<'a> {
skip_assert_initialized!();
let n_features = caps_features.get_size();
Iter {
caps_features,
idx: 0,
n_features,
}
}
}
impl<'a> Iterator for Iter<'a> {
type Item = &'a str;
fn next(&mut self) -> Option<Self::Item> {
if self.idx >= self.n_features {
return None;
}
unsafe {
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let feature = gst_sys::gst_caps_features_get_nth(self.caps_features.as_ptr(), self.idx);
if feature.is_null() {
return None;
}
self.idx += 1;
Some(CStr::from_ptr(feature).to_str().unwrap())
}
}
fn size_hint(&self) -> (usize, Option<usize>) {
if self.idx == self.n_features {
return (0, Some(0));
}
let remaining = (self.n_features - 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.n_features {
return None;
}
self.n_features -= 1;
unsafe {
let feature =
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gst_sys::gst_caps_features_get_nth(self.caps_features.as_ptr(), self.n_features);
if feature.is_null() {
return None;
}
Some(CStr::from_ptr(feature).to_str().unwrap())
}
}
}
impl<'a> ExactSizeIterator for Iter<'a> {}
impl fmt::Debug for CapsFeaturesRef {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_tuple("CapsFeatures")
.field(&self.to_string())
.finish()
}
}
impl fmt::Display for CapsFeaturesRef {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let s = unsafe {
glib::GString::from_glib_full(gst_sys::gst_caps_features_to_string(self.as_ptr()))
};
f.write_str(&s)
}
}
impl ToOwned for CapsFeaturesRef {
type Owned = CapsFeatures;
fn to_owned(&self) -> CapsFeatures {
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unsafe {
from_glib_full(gst_sys::gst_caps_features_copy(self.as_ptr() as *const _) as *mut _)
}
}
}
unsafe impl Sync for CapsFeaturesRef {}
unsafe impl Send for CapsFeaturesRef {}
lazy_static! {
pub static ref CAPS_FEATURE_MEMORY_SYSTEM_MEMORY: &'static str = unsafe {
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CStr::from_ptr(gst_sys::GST_CAPS_FEATURE_MEMORY_SYSTEM_MEMORY)
.to_str()
.unwrap()
};
pub static ref CAPS_FEATURES_MEMORY_SYSTEM_MEMORY: CapsFeatures =
CapsFeatures::new(&[*CAPS_FEATURE_MEMORY_SYSTEM_MEMORY]);
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_from_value_optional() {
::init().unwrap();
let a = glib::value::Value::from(None::<&CapsFeatures>);
assert!(a.get::<CapsFeatures>().unwrap().is_none());
let b = glib::value::Value::from(&CapsFeatures::new_empty());
assert!(b.get::<CapsFeatures>().unwrap().is_some());
}
}