gstreamer-rs/gstreamer/src/caps_features.rs

494 lines
14 KiB
Rust
Raw Normal View History

// 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::mem;
use std::ops::{Deref, DerefMut};
use std::ptr;
use std::str;
use once_cell::sync::Lazy;
use glib::ffi::gpointer;
use glib::translate::{
from_glib, from_glib_full, FromGlibPtrFull, FromGlibPtrNone, GlibPtrDefault, Stash, StashMut,
ToGlibPtr, ToGlibPtrMut,
};
pub struct CapsFeatures(ptr::NonNull<CapsFeaturesRef>);
unsafe impl Send for CapsFeatures {}
unsafe impl Sync for CapsFeatures {}
impl CapsFeatures {
pub fn new(features: &[&str]) -> Self {
2020-03-22 14:18:47 +00:00
assert_initialized_main_thread!();
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(
ffi::gst_caps_features_new_empty() as *mut CapsFeaturesRef,
))
}
}
pub fn new_any() -> Self {
assert_initialized_main_thread!();
unsafe {
CapsFeatures(ptr::NonNull::new_unchecked(
ffi::gst_caps_features_new_any() as *mut CapsFeaturesRef,
))
}
}
pub unsafe fn into_ptr(self) -> *mut ffi::GstCapsFeatures {
let s = mem::ManuallyDrop::new(self);
s.0.as_ptr() as *mut CapsFeaturesRef as *mut ffi::GstCapsFeatures
}
}
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 {
let ptr = ffi::gst_caps_features_copy(&self.0.as_ref().0) as *mut CapsFeaturesRef;
assert!(!ptr.is_null());
CapsFeatures(ptr::NonNull::new_unchecked(ptr))
}
}
}
impl Drop for CapsFeatures {
fn drop(&mut self) {
unsafe { ffi::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 = glib::BoolError;
2020-11-28 11:34:36 +00:00
fn from_str(s: &str) -> Result<Self, Self::Err> {
assert_initialized_main_thread!();
unsafe {
let ptr = ffi::gst_caps_features_from_string(s.to_glib_none().0);
if ptr.is_null() {
return Err(glib::glib_bool_error!(
"Failed to parse caps features from string"
));
}
2020-11-28 11:34:36 +00:00
Ok(Self(ptr::NonNull::new_unchecked(
ptr as *mut CapsFeaturesRef,
)))
}
}
}
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 {
unsafe { from_glib(ffi::gst_caps_features_get_type()) }
}
}
impl<'a> ToGlibPtr<'a, *const ffi::GstCapsFeatures> for CapsFeatures {
type Storage = &'a Self;
fn to_glib_none(&'a self) -> Stash<'a, *const ffi::GstCapsFeatures, Self> {
unsafe { Stash(&self.0.as_ref().0, self) }
}
fn to_glib_full(&self) -> *const ffi::GstCapsFeatures {
unsafe { ffi::gst_caps_features_copy(&self.0.as_ref().0) }
}
}
impl<'a> ToGlibPtr<'a, *mut ffi::GstCapsFeatures> for CapsFeatures {
type Storage = &'a Self;
fn to_glib_none(&'a self) -> Stash<'a, *mut ffi::GstCapsFeatures, Self> {
unsafe { Stash(&self.0.as_ref().0 as *const _ as *mut _, self) }
}
fn to_glib_full(&self) -> *mut ffi::GstCapsFeatures {
unsafe { ffi::gst_caps_features_copy(&self.0.as_ref().0) }
}
}
impl<'a> ToGlibPtrMut<'a, *mut ffi::GstCapsFeatures> for CapsFeatures {
type Storage = &'a mut Self;
fn to_glib_none_mut(&'a mut self) -> StashMut<*mut ffi::GstCapsFeatures, Self> {
unsafe { StashMut(&mut self.0.as_mut().0, self) }
}
}
impl FromGlibPtrNone<*const ffi::GstCapsFeatures> for CapsFeatures {
unsafe fn from_glib_none(ptr: *const ffi::GstCapsFeatures) -> Self {
assert!(!ptr.is_null());
let ptr = ffi::gst_caps_features_copy(ptr);
assert!(!ptr.is_null());
CapsFeatures(ptr::NonNull::new_unchecked(ptr as *mut CapsFeaturesRef))
}
}
impl FromGlibPtrNone<*mut ffi::GstCapsFeatures> for CapsFeatures {
unsafe fn from_glib_none(ptr: *mut ffi::GstCapsFeatures) -> Self {
assert!(!ptr.is_null());
let ptr = ffi::gst_caps_features_copy(ptr);
assert!(!ptr.is_null());
CapsFeatures(ptr::NonNull::new_unchecked(ptr as *mut CapsFeaturesRef))
}
}
impl FromGlibPtrFull<*const ffi::GstCapsFeatures> for CapsFeatures {
unsafe fn from_glib_full(ptr: *const ffi::GstCapsFeatures) -> Self {
assert!(!ptr.is_null());
CapsFeatures(ptr::NonNull::new_unchecked(ptr as *mut CapsFeaturesRef))
}
}
impl FromGlibPtrFull<*mut ffi::GstCapsFeatures> for CapsFeatures {
unsafe fn from_glib_full(ptr: *mut ffi::GstCapsFeatures) -> Self {
assert!(!ptr.is_null());
CapsFeatures(ptr::NonNull::new_unchecked(ptr as *mut CapsFeaturesRef))
}
}
impl<'a> glib::value::FromValueOptional<'a> for CapsFeatures {
unsafe fn from_value_optional(v: &'a glib::Value) -> Option<Self> {
<&'a CapsFeaturesRef as glib::value::FromValueOptional<'a>>::from_value_optional(v)
.map(ToOwned::to_owned)
}
}
impl glib::value::SetValue for CapsFeatures {
unsafe fn set_value(v: &mut glib::Value, s: &Self) {
<CapsFeaturesRef as glib::value::SetValue>::set_value(v, s.as_ref())
}
}
impl glib::value::SetValueOptional for CapsFeatures {
unsafe fn set_value_optional(v: &mut glib::Value, s: Option<&Self>) {
<CapsFeaturesRef as glib::value::SetValueOptional>::set_value_optional(
v,
s.map(|s| s.as_ref()),
)
}
}
impl GlibPtrDefault for CapsFeatures {
type GlibType = *mut ffi::GstCapsFeatures;
}
#[repr(transparent)]
pub struct CapsFeaturesRef(ffi::GstCapsFeatures);
impl CapsFeaturesRef {
pub unsafe fn from_glib_borrow<'a>(ptr: *const ffi::GstCapsFeatures) -> &'a CapsFeaturesRef {
assert!(!ptr.is_null());
&*(ptr as *mut CapsFeaturesRef)
}
pub unsafe fn from_glib_borrow_mut<'a>(
ptr: *mut ffi::GstCapsFeatures,
) -> &'a mut CapsFeaturesRef {
assert!(!ptr.is_null());
&mut *(ptr as *mut CapsFeaturesRef)
}
pub unsafe fn as_ptr(&self) -> *const ffi::GstCapsFeatures {
self as *const Self as *const ffi::GstCapsFeatures
}
pub unsafe fn as_mut_ptr(&self) -> *mut ffi::GstCapsFeatures {
self as *const Self as *mut ffi::GstCapsFeatures
}
pub fn is_empty(&self) -> bool {
self.get_size() == 0 && !self.is_any()
}
pub fn is_any(&self) -> bool {
unsafe { from_glib(ffi::gst_caps_features_is_any(self.as_ptr())) }
}
pub fn contains(&self, feature: &str) -> bool {
unsafe {
from_glib(ffi::gst_caps_features_contains(
self.as_ptr(),
feature.to_glib_none().0,
))
}
}
pub fn get_size(&self) -> u32 {
unsafe { ffi::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 {
let feature = ffi::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) {
unsafe { ffi::gst_caps_features_add(self.as_mut_ptr(), feature.to_glib_none().0) }
}
pub fn remove(&mut self, feature: &str) {
unsafe { ffi::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 {
from_glib(ffi::gst_caps_features_is_equal(
self.as_ptr(),
other.as_ptr(),
))
}
}
}
impl glib::types::StaticType for CapsFeaturesRef {
fn static_type() -> glib::types::Type {
unsafe { from_glib(ffi::gst_structure_get_type()) }
}
}
impl<'a> glib::value::FromValueOptional<'a> for &'a CapsFeaturesRef {
unsafe fn from_value_optional(v: &'a glib::Value) -> Option<Self> {
let ptr = glib::gobject_ffi::g_value_get_boxed(v.to_glib_none().0);
if ptr.is_null() {
None
} else {
Some(CapsFeaturesRef::from_glib_borrow(
ptr as *const ffi::GstCapsFeatures,
))
}
}
}
impl glib::value::SetValue for CapsFeaturesRef {
unsafe fn set_value(v: &mut glib::Value, s: &Self) {
glib::gobject_ffi::g_value_set_boxed(v.to_glib_none_mut().0, s.as_ptr() as gpointer);
}
}
impl glib::value::SetValueOptional for CapsFeaturesRef {
unsafe fn set_value_optional(v: &mut glib::Value, s: Option<&Self>) {
if let Some(s) = s {
glib::gobject_ffi::g_value_set_boxed(v.to_glib_none_mut().0, s.as_ptr() as gpointer);
} else {
glib::gobject_ffi::g_value_set_boxed(v.to_glib_none_mut().0, ptr::null_mut());
}
}
}
#[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 {
let feature = ffi::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 =
ffi::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(ffi::gst_caps_features_to_string(self.as_ptr()))
};
f.write_str(&s)
}
}
impl ToOwned for CapsFeaturesRef {
type Owned = CapsFeatures;
fn to_owned(&self) -> CapsFeatures {
unsafe { from_glib_full(ffi::gst_caps_features_copy(self.as_ptr() as *const _) as *mut _) }
}
}
unsafe impl Sync for CapsFeaturesRef {}
unsafe impl Send for CapsFeaturesRef {}
pub static CAPS_FEATURE_MEMORY_SYSTEM_MEMORY: Lazy<&'static str> = Lazy::new(|| unsafe {
CStr::from_ptr(ffi::GST_CAPS_FEATURE_MEMORY_SYSTEM_MEMORY)
.to_str()
.unwrap()
});
pub static CAPS_FEATURES_MEMORY_SYSTEM_MEMORY: Lazy<CapsFeatures> =
Lazy::new(|| CapsFeatures::new(&[*CAPS_FEATURE_MEMORY_SYSTEM_MEMORY]));
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_from_value_optional() {
crate::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());
}
}