gstreamer-rs/gstreamer/src/miniobject.rs
2017-10-17 12:06:51 +03:00

472 lines
14 KiB
Rust

// Copyright (C) 2016-2017 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 std::{borrow, fmt, ops};
use std::mem;
use std::ptr;
use std::marker::PhantomData;
use ffi;
use glib_ffi::gpointer;
use glib_ffi;
use gobject_ffi;
use glib::translate::{c_ptr_array_len, from_glib, from_glib_full, from_glib_none,
FromGlibContainerAsVec, FromGlibPtrArrayContainerAsVec, FromGlibPtrBorrow,
FromGlibPtrFull, FromGlibPtrNone, GlibPtrDefault, Stash, StashMut,
ToGlibContainerFromSlice, ToGlibPtr, ToGlibPtrMut};
use glib;
pub struct GstRc<T: MiniObject> {
obj: *mut T,
borrowed: bool,
phantom: PhantomData<T>,
}
impl<T: MiniObject> GstRc<T> {
pub unsafe fn from_glib_none(ptr: *const T::GstType) -> Self {
assert!(!ptr.is_null());
ffi::gst_mini_object_ref(ptr as *mut ffi::GstMiniObject);
GstRc {
obj: T::from_mut_ptr(ptr as *mut T::GstType) as *mut T,
borrowed: false,
phantom: PhantomData,
}
}
pub unsafe fn from_glib_full(ptr: *const T::GstType) -> Self {
assert!(!ptr.is_null());
GstRc {
obj: T::from_mut_ptr(ptr as *mut T::GstType) as *mut T,
borrowed: false,
phantom: PhantomData,
}
}
pub unsafe fn from_glib_borrow(ptr: *const T::GstType) -> Self {
assert!(!ptr.is_null());
GstRc {
obj: T::from_mut_ptr(ptr as *mut T::GstType) as *mut T,
borrowed: true,
phantom: PhantomData,
}
}
pub fn make_mut(&mut self) -> &mut T {
unsafe {
if self.is_writable() {
return &mut *self.obj;
}
self.obj = T::from_mut_ptr(
ffi::gst_mini_object_make_writable(self.as_mut_ptr() as *mut ffi::GstMiniObject)
as *mut T::GstType,
);
assert!(self.is_writable());
&mut *self.obj
}
}
pub fn get_mut(&mut self) -> Option<&mut T> {
if self.is_writable() {
Some(unsafe { &mut *self.obj })
} else {
None
}
}
pub fn is_writable(&self) -> bool {
unsafe {
from_glib(ffi::gst_mini_object_is_writable(
self.as_ptr() as *const ffi::GstMiniObject,
))
}
}
pub unsafe fn into_ptr(self) -> *mut T::GstType {
let ptr = self.as_mut_ptr();
mem::forget(self);
ptr
}
}
impl<T: MiniObject> ops::Deref for GstRc<T> {
type Target = T;
fn deref(&self) -> &T {
self.as_ref()
}
}
impl<T: MiniObject> AsRef<T> for GstRc<T> {
fn as_ref(&self) -> &T {
unsafe { &*self.obj }
}
}
impl<T: MiniObject> borrow::Borrow<T> for GstRc<T> {
fn borrow(&self) -> &T {
self.as_ref()
}
}
// FIXME: Not generally possible because neither T nor ToOwned are defined here...
//impl<T: MiniObject> ToOwned for T {
// type Owned = GstRc<T>;
//
// fn to_owned(&self) -> GstRc<T> {
// unsafe { GstRc::from_unowned_ptr(self.as_ptr()) }
// }
//}
impl<T: MiniObject> Clone for GstRc<T> {
fn clone(&self) -> GstRc<T> {
unsafe { GstRc::from_glib_none(self.as_ptr()) }
}
}
impl<T: MiniObject> Drop for GstRc<T> {
fn drop(&mut self) {
if !self.borrowed {
unsafe {
ffi::gst_mini_object_unref(self.as_mut_ptr() as *mut ffi::GstMiniObject);
}
}
}
}
unsafe impl<T: MiniObject + Sync + Send> Sync for GstRc<T> {}
unsafe impl<T: MiniObject + Sync + Send> Send for GstRc<T> {}
impl<T: MiniObject + PartialEq> PartialEq for GstRc<T> {
fn eq(&self, other: &Self) -> bool {
self.as_ref().eq(other.as_ref())
}
}
impl<T: MiniObject + Eq> Eq for GstRc<T> {}
impl<T: MiniObject + fmt::Debug> fmt::Debug for GstRc<T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.as_ref().fmt(f)
}
}
impl<T: MiniObject + fmt::Display> fmt::Display for GstRc<T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.as_ref().fmt(f)
}
}
pub unsafe trait MiniObject
where
Self: Sized,
{
type GstType;
unsafe fn as_ptr(&self) -> *const Self::GstType {
self as *const Self as *const Self::GstType
}
unsafe fn as_mut_ptr(&self) -> *mut Self::GstType {
self as *const Self as *mut Self::GstType
}
unsafe fn from_ptr<'a>(ptr: *const Self::GstType) -> &'a Self {
assert!(!ptr.is_null());
&*(ptr as *const Self)
}
unsafe fn from_mut_ptr<'a>(ptr: *mut Self::GstType) -> &'a mut Self {
assert!(!ptr.is_null());
&mut *(ptr as *mut Self)
}
fn copy(&self) -> GstRc<Self> {
unsafe {
GstRc::from_glib_full(
ffi::gst_mini_object_copy(self.as_ptr() as *const ffi::GstMiniObject)
as *const Self::GstType,
)
}
}
}
impl<'a, T: MiniObject + 'static> ToGlibPtr<'a, *const T::GstType> for GstRc<T> {
type Storage = &'a Self;
fn to_glib_none(&'a self) -> Stash<'a, *const T::GstType, Self> {
Stash(unsafe { self.as_ptr() }, self)
}
fn to_glib_full(&self) -> *const T::GstType {
unsafe {
ffi::gst_mini_object_ref(self.as_mut_ptr() as *mut ffi::GstMiniObject);
self.as_ptr()
}
}
}
impl<'a, T: MiniObject + 'static> ToGlibPtr<'a, *mut T::GstType> for GstRc<T> {
type Storage = &'a Self;
fn to_glib_none(&'a self) -> Stash<'a, *mut T::GstType, Self> {
Stash(unsafe { self.as_mut_ptr() }, self)
}
fn to_glib_full(&self) -> *mut T::GstType {
unsafe {
ffi::gst_mini_object_ref(self.as_mut_ptr() as *mut ffi::GstMiniObject);
self.as_mut_ptr()
}
}
}
impl<'a, T: MiniObject + 'static> ToGlibPtrMut<'a, *mut T::GstType> for GstRc<T> {
type Storage = &'a mut Self;
fn to_glib_none_mut(&'a mut self) -> StashMut<*mut T::GstType, Self> {
self.make_mut();
StashMut(unsafe { self.as_mut_ptr() }, self)
}
}
impl<'a, T: MiniObject + 'static> ToGlibContainerFromSlice<'a, *mut *mut T::GstType> for GstRc<T> {
#[cfg_attr(feature = "cargo-clippy", allow(type_complexity))]
type Storage = (
Vec<Stash<'a, *mut T::GstType, GstRc<T>>>,
Option<Vec<*mut T::GstType>>,
);
fn to_glib_none_from_slice(t: &'a [GstRc<T>]) -> (*mut *mut T::GstType, Self::Storage) {
skip_assert_initialized!();
let v: Vec<_> = t.iter().map(|s| s.to_glib_none()).collect();
let mut v_ptr: Vec<_> = v.iter().map(|s| s.0).collect();
v_ptr.push(ptr::null_mut() as *mut T::GstType);
(v_ptr.as_ptr() as *mut *mut T::GstType, (v, Some(v_ptr)))
}
fn to_glib_container_from_slice(t: &'a [GstRc<T>]) -> (*mut *mut T::GstType, Self::Storage) {
skip_assert_initialized!();
let v: Vec<_> = t.iter().map(|s| s.to_glib_none()).collect();
let v_ptr = unsafe {
let v_ptr = glib_ffi::g_malloc0(mem::size_of::<*mut T::GstType>() * t.len() + 1)
as *mut *mut T::GstType;
for (i, s) in v.iter().enumerate() {
ptr::write(v_ptr.offset(i as isize), s.0);
}
v_ptr
};
(v_ptr, (v, None))
}
fn to_glib_full_from_slice(t: &[GstRc<T>]) -> *mut *mut T::GstType {
skip_assert_initialized!();
unsafe {
let v_ptr = glib_ffi::g_malloc0(mem::size_of::<*mut T::GstType>() * t.len() + 1)
as *mut *mut T::GstType;
for (i, s) in t.iter().enumerate() {
ptr::write(v_ptr.offset(i as isize), s.to_glib_full());
}
v_ptr
}
}
}
impl<'a, T: MiniObject + 'static> ToGlibContainerFromSlice<'a, *const *mut T::GstType>
for GstRc<T> {
#[cfg_attr(feature = "cargo-clippy", allow(type_complexity))]
type Storage = (
Vec<Stash<'a, *mut T::GstType, GstRc<T>>>,
Option<Vec<*mut T::GstType>>,
);
fn to_glib_none_from_slice(t: &'a [GstRc<T>]) -> (*const *mut T::GstType, Self::Storage) {
skip_assert_initialized!();
let (ptr, stash) =
ToGlibContainerFromSlice::<'a, *mut *mut T::GstType>::to_glib_none_from_slice(t);
(ptr as *const *mut T::GstType, stash)
}
fn to_glib_container_from_slice(_: &'a [GstRc<T>]) -> (*const *mut T::GstType, Self::Storage) {
skip_assert_initialized!();
// Can't have consumer free a *const pointer
unimplemented!()
}
fn to_glib_full_from_slice(_: &[GstRc<T>]) -> *const *mut T::GstType {
skip_assert_initialized!();
// Can't have consumer free a *const pointer
unimplemented!()
}
}
impl<T: MiniObject + 'static> FromGlibPtrNone<*const T::GstType> for GstRc<T> {
unsafe fn from_glib_none(ptr: *const T::GstType) -> Self {
Self::from_glib_none(ptr)
}
}
impl<T: MiniObject + 'static> FromGlibPtrNone<*mut T::GstType> for GstRc<T> {
unsafe fn from_glib_none(ptr: *mut T::GstType) -> Self {
Self::from_glib_none(ptr)
}
}
impl<T: MiniObject + 'static> FromGlibPtrFull<*const T::GstType> for GstRc<T> {
unsafe fn from_glib_full(ptr: *const T::GstType) -> Self {
Self::from_glib_full(ptr)
}
}
impl<T: MiniObject + 'static> FromGlibPtrFull<*mut T::GstType> for GstRc<T> {
unsafe fn from_glib_full(ptr: *mut T::GstType) -> Self {
Self::from_glib_full(ptr)
}
}
impl<T: MiniObject + 'static> FromGlibPtrBorrow<*const T::GstType> for GstRc<T> {
unsafe fn from_glib_borrow(ptr: *const T::GstType) -> Self {
Self::from_glib_borrow(ptr)
}
}
impl<T: MiniObject + 'static> FromGlibPtrBorrow<*mut T::GstType> for GstRc<T> {
unsafe fn from_glib_borrow(ptr: *mut T::GstType) -> Self {
Self::from_glib_borrow(ptr)
}
}
impl<T: MiniObject + 'static> FromGlibContainerAsVec<*mut T::GstType, *mut *mut T::GstType>
for GstRc<T> {
unsafe fn from_glib_none_num_as_vec(ptr: *mut *mut T::GstType, num: usize) -> Vec<Self> {
if num == 0 || ptr.is_null() {
return Vec::new();
}
let mut res = Vec::with_capacity(num);
for i in 0..num {
res.push(from_glib_none(ptr::read(ptr.offset(i as isize))));
}
res
}
unsafe fn from_glib_container_num_as_vec(ptr: *mut *mut T::GstType, num: usize) -> Vec<Self> {
let res = FromGlibContainerAsVec::from_glib_none_num_as_vec(ptr, num);
glib_ffi::g_free(ptr as *mut _);
res
}
unsafe fn from_glib_full_num_as_vec(ptr: *mut *mut T::GstType, num: usize) -> Vec<Self> {
if num == 0 || ptr.is_null() {
return Vec::new();
}
let mut res = Vec::with_capacity(num);
for i in 0..num {
res.push(from_glib_full(ptr::read(ptr.offset(i as isize))));
}
glib_ffi::g_free(ptr as *mut _);
res
}
}
impl<T: MiniObject + 'static> FromGlibPtrArrayContainerAsVec<*mut T::GstType, *mut *mut T::GstType>
for GstRc<T> {
unsafe fn from_glib_none_as_vec(ptr: *mut *mut T::GstType) -> Vec<Self> {
FromGlibContainerAsVec::from_glib_none_num_as_vec(ptr, c_ptr_array_len(ptr))
}
unsafe fn from_glib_container_as_vec(ptr: *mut *mut T::GstType) -> Vec<Self> {
FromGlibContainerAsVec::from_glib_container_num_as_vec(ptr, c_ptr_array_len(ptr))
}
unsafe fn from_glib_full_as_vec(ptr: *mut *mut T::GstType) -> Vec<Self> {
FromGlibContainerAsVec::from_glib_full_num_as_vec(ptr, c_ptr_array_len(ptr))
}
}
impl<T: MiniObject + 'static> FromGlibContainerAsVec<*mut T::GstType, *const *mut T::GstType>
for GstRc<T> {
unsafe fn from_glib_none_num_as_vec(ptr: *const *mut T::GstType, num: usize) -> Vec<Self> {
FromGlibContainerAsVec::from_glib_none_num_as_vec(ptr as *mut *mut _, num)
}
unsafe fn from_glib_container_num_as_vec(_: *const *mut T::GstType, _: usize) -> Vec<Self> {
// Can't free a *const
unimplemented!()
}
unsafe fn from_glib_full_num_as_vec(_: *const *mut T::GstType, _: usize) -> Vec<Self> {
// Can't free a *const
unimplemented!()
}
}
impl<
T: MiniObject + 'static,
> FromGlibPtrArrayContainerAsVec<*mut T::GstType, *const *mut T::GstType> for GstRc<T> {
unsafe fn from_glib_none_as_vec(ptr: *const *mut T::GstType) -> Vec<Self> {
FromGlibPtrArrayContainerAsVec::from_glib_none_as_vec(ptr as *mut *mut _)
}
unsafe fn from_glib_container_as_vec(_: *const *mut T::GstType) -> Vec<Self> {
// Can't free a *const
unimplemented!()
}
unsafe fn from_glib_full_as_vec(_: *const *mut T::GstType) -> Vec<Self> {
// Can't free a *const
unimplemented!()
}
}
impl<T: MiniObject + glib::StaticType> glib::StaticType for GstRc<T> {
fn static_type() -> glib::types::Type {
T::static_type()
}
}
impl<'a, T: MiniObject + glib::StaticType + 'static> glib::value::FromValueOptional<'a>
for GstRc<T> {
unsafe fn from_value_optional(v: &'a glib::Value) -> Option<Self> {
let ptr = gobject_ffi::g_value_get_boxed(v.to_glib_none().0);
from_glib_none(ptr as *const T::GstType)
}
}
impl<T: MiniObject + glib::StaticType> glib::value::SetValue for GstRc<T> {
unsafe fn set_value(v: &mut glib::Value, s: &Self) {
gobject_ffi::g_value_set_boxed(v.to_glib_none_mut().0, s.as_ptr() as gpointer);
}
}
impl<T: MiniObject + glib::StaticType> glib::value::SetValueOptional for GstRc<T> {
unsafe fn set_value_optional(v: &mut glib::Value, s: Option<&Self>) {
if let Some(s) = s {
gobject_ffi::g_value_set_boxed(v.to_glib_none_mut().0, s.as_ptr() as gpointer);
} else {
gobject_ffi::g_value_set_boxed(v.to_glib_none_mut().0, ptr::null_mut());
}
}
}
impl<T: MiniObject + 'static> GlibPtrDefault for GstRc<T> {
type GlibType = *mut T::GstType;
}