forked from mirrors/gstreamer-rs
Add more complete gst::Iterator bindings
filter(), foreach(), find(), fold() are implemented now and we can create our own iterators from a Vec<_> or by implementing a new trait.
This commit is contained in:
parent
858b73a672
commit
8306e5cf72
1 changed files with 412 additions and 0 deletions
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@ -4,11 +4,15 @@
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use ffi;
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use glib::translate::*;
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use glib_ffi;
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use glib_ffi::{gconstpointer, gpointer};
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use gobject_ffi;
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use std::mem;
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use std::ptr;
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use glib;
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use glib::Value;
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use IteratorResult;
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use std::sync::Arc;
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use std::ffi::CString;
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glib_wrapper! {
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pub struct Iterator(Boxed<ffi::GstIterator>);
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@ -42,6 +46,414 @@ impl Iterator {
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ffi::gst_iterator_resync(self.to_glib_none_mut().0);
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}
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}
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pub fn filter<F>(self, func: F) -> Self
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where
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F: Fn(&glib::Value) -> bool + Send + Sync + 'static,
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{
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unsafe {
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let it = self.to_glib_none().0;
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mem::forget(self);
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let mut closure_value: gobject_ffi::GValue = mem::zeroed();
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let func_box: Box<Fn(&glib::Value) -> bool + Send + Sync + 'static> = Box::new(func);
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gobject_ffi::g_value_init(&mut closure_value, filter_boxed_get_type());
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gobject_ffi::g_value_take_boxed(
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&mut closure_value,
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Arc::into_raw(Arc::new(func_box)) as gpointer,
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);
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let it = from_glib_full(ffi::gst_iterator_filter(
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it as *mut _,
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Some(filter_trampoline),
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&closure_value,
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));
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gobject_ffi::g_value_unset(&mut closure_value);
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it
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}
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}
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pub fn find<F>(&mut self, func: F) -> Option<glib::Value>
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where
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F: FnMut(&glib::Value) -> bool,
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{
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unsafe {
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let mut elem = glib::Value::uninitialized();
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let mut func = func;
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let func_obj: &mut (FnMut(&glib::Value) -> bool) = &mut func;
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let func_ptr = &func_obj as *const &mut (FnMut(&glib::Value) -> bool) as gpointer;
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let res = from_glib(ffi::gst_iterator_find_custom(
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self.to_glib_none_mut().0,
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Some(find_trampoline),
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elem.to_glib_none_mut().0,
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func_ptr,
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));
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if res {
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Some(elem)
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} else {
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None
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}
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}
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}
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pub fn foreach<F>(&mut self, func: F) -> IteratorResult
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where
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F: FnMut(&glib::Value),
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{
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unsafe {
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let mut func = func;
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let func_obj: &mut (FnMut(&glib::Value)) = &mut func;
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let func_ptr = &func_obj as *const &mut (FnMut(&glib::Value)) as gpointer;
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from_glib(ffi::gst_iterator_foreach(
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self.to_glib_none_mut().0,
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Some(foreach_trampoline),
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func_ptr,
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))
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}
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}
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pub fn fold<F, T>(&mut self, init: T, func: F) -> Result<T, IteratorResult>
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where
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F: FnMut(T, &glib::Value) -> Result<T, T>,
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{
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unsafe {
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let mut func = func;
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let func_obj: &mut (FnMut(T, &glib::Value) -> Result<T, T>) = &mut func;
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let func_ptr =
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&func_obj as *const &mut (FnMut(T, &glib::Value) -> Result<T, T>) as gpointer;
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let mut ret = glib::Value::uninitialized();
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let mut accum = Some(init);
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gobject_ffi::g_value_init(ret.to_glib_none_mut().0, gobject_ffi::G_TYPE_POINTER);
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gobject_ffi::g_value_set_pointer(
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ret.to_glib_none_mut().0,
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&mut accum as *mut _ as gpointer,
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);
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let res = from_glib(ffi::gst_iterator_fold(
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self.to_glib_none_mut().0,
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Some(fold_trampoline::<T>),
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ret.to_glib_none_mut().0,
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func_ptr,
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));
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gobject_ffi::g_value_unset(ret.to_glib_none_mut().0);
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match res {
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IteratorResult::Ok | IteratorResult::Done => Ok(accum.unwrap()),
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_ => Err(res),
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}
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}
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}
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pub fn new<I: IteratorImpl>(imp: I) -> Self {
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static DUMMY_COOKIE: u32 = 0;
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unsafe {
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let it = ffi::gst_iterator_new(
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mem::size_of::<RsIterator<I>>() as u32,
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I::item_type().to_glib(),
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ptr::null_mut(),
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&DUMMY_COOKIE as *const _ as *mut _,
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Some(rs_iterator_copy::<I>),
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Some(rs_iterator_next::<I>),
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None,
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Some(rs_iterator_resync::<I>),
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Some(rs_iterator_free::<I>),
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);
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{
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let it = it as *mut RsIterator<I>;
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(*it).imp = Some(imp);
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}
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from_glib_full(it)
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}
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}
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pub fn from_vec<T: glib::StaticType + glib::value::ToValue + Clone + Send + 'static>(
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items: Vec<T>,
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) -> Self {
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Self::new(VecIteratorImpl::new(items))
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}
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}
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#[repr(C)]
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struct RsIterator<I: IteratorImpl> {
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iter: ffi::GstIterator,
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imp: Option<I>,
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}
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pub trait IteratorImpl: Clone + Send + 'static {
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fn item_type() -> glib::Type;
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fn next(&mut self) -> Result<glib::Value, IteratorResult>;
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fn resync(&mut self);
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}
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unsafe extern "C" fn rs_iterator_copy<I: IteratorImpl>(
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it: *const ffi::GstIterator,
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copy: *mut ffi::GstIterator,
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) {
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callback_guard!();
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let it = it as *const RsIterator<I>;
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let copy = copy as *mut RsIterator<I>;
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ptr::write(&mut (*copy).imp, (*it).imp.clone());
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}
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unsafe extern "C" fn rs_iterator_free<I: IteratorImpl>(it: *mut ffi::GstIterator) {
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callback_guard!();
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let it = it as *mut RsIterator<I>;
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let _ = (*it).imp.take();
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}
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unsafe extern "C" fn rs_iterator_next<I: IteratorImpl>(
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it: *mut ffi::GstIterator,
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result: *mut gobject_ffi::GValue,
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) -> ffi::GstIteratorResult {
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callback_guard!();
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let it = it as *mut RsIterator<I>;
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match (*it).imp.as_mut().map(|imp| imp.next()).unwrap() {
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Ok(value) => {
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ptr::write(result, ptr::read(value.to_glib_none().0));
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mem::forget(value);
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ffi::GST_ITERATOR_OK
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}
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Err(res) => {
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assert_ne!(res, IteratorResult::Ok);
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res.to_glib()
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}
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}
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}
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unsafe extern "C" fn rs_iterator_resync<I: IteratorImpl>(it: *mut ffi::GstIterator) {
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callback_guard!();
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let it = it as *mut RsIterator<I>;
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(*it).imp.as_mut().map(|imp| imp.resync()).unwrap();
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}
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#[derive(Clone)]
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struct VecIteratorImpl<T: glib::StaticType + glib::value::ToValue + Clone + Send + 'static> {
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pos: usize,
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items: Vec<T>,
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}
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impl<T: glib::StaticType + glib::value::ToValue + Clone + Send + 'static> VecIteratorImpl<T> {
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fn new(items: Vec<T>) -> Self {
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Self {
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pos: 0,
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items: items,
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}
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}
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}
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impl<T: glib::StaticType + glib::value::ToValue + Clone + Send + 'static> IteratorImpl
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for VecIteratorImpl<T> {
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fn item_type() -> glib::Type {
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T::static_type()
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}
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fn next(&mut self) -> Result<glib::Value, IteratorResult> {
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if self.pos < self.items.len() {
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let res = Ok(self.items[self.pos].clone().to_value());
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self.pos += 1;
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return res;
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}
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Err(IteratorResult::Done)
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}
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fn resync(&mut self) {
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self.pos = 0;
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}
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}
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unsafe impl Send for Iterator {}
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unsafe extern "C" fn filter_trampoline(value: gconstpointer, func: gconstpointer) -> i32 {
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callback_guard!();
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let value = value as *const gobject_ffi::GValue;
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let func = func as *const gobject_ffi::GValue;
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let func = gobject_ffi::g_value_get_boxed(func);
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#[cfg_attr(feature = "cargo-clippy", allow(transmute_ptr_to_ref))]
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let func: &&(Fn(&glib::Value) -> bool + Send + Sync + 'static) = mem::transmute(func);
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let value = &*(value as *const glib::Value);
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if func(value) {
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0
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} else {
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-1
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}
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}
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unsafe extern "C" fn filter_boxed_ref(boxed: gpointer) -> gpointer {
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callback_guard!();
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let boxed = Arc::from_raw(
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boxed as *const (Box<Fn(&glib::Value) -> bool + Send + Sync + 'static>),
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);
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let copy = boxed.clone();
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// Forget it and keep it alive, we will still need it later
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let _ = Arc::into_raw(boxed);
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Arc::into_raw(copy) as gpointer
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}
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unsafe extern "C" fn filter_boxed_unref(boxed: gpointer) {
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callback_guard!();
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let _ = Arc::from_raw(
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boxed as *const (Box<Fn(&glib::Value) -> bool + Send + Sync + 'static>),
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);
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}
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unsafe extern "C" fn filter_boxed_get_type() -> glib_ffi::GType {
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use std::sync::{Once, ONCE_INIT};
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callback_guard!();
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static mut TYPE: glib_ffi::GType = gobject_ffi::G_TYPE_INVALID;
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static ONCE: Once = ONCE_INIT;
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ONCE.call_once(|| {
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let type_name = {
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let mut idx = 0;
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loop {
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let type_name = CString::new(format!("GstRsIteratorFilterBoxed-{}", idx)).unwrap();
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if gobject_ffi::g_type_from_name(type_name.as_ptr()) == gobject_ffi::G_TYPE_INVALID
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{
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break type_name;
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}
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idx += 1;
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}
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};
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TYPE = gobject_ffi::g_boxed_type_register_static(
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type_name.as_ptr(),
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Some(filter_boxed_ref),
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Some(filter_boxed_unref),
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);
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});
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TYPE
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}
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unsafe extern "C" fn find_trampoline(value: gconstpointer, func: gconstpointer) -> i32 {
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callback_guard!();
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let value = value as *const gobject_ffi::GValue;
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let func = func as *const &mut (FnMut(&glib::Value) -> bool);
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let value = &*(value as *const glib::Value);
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if (*func)(value) {
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0
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} else {
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-1
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}
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}
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unsafe extern "C" fn foreach_trampoline(value: *const gobject_ffi::GValue, func: gpointer) {
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callback_guard!();
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let func = func as *const &mut (FnMut(&glib::Value));
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let value = &*(value as *const glib::Value);
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(*func)(value);
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}
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unsafe extern "C" fn fold_trampoline<T>(
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value: *const gobject_ffi::GValue,
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ret: *mut gobject_ffi::GValue,
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func: gpointer,
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) -> glib_ffi::gboolean {
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callback_guard!();
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let func = func as *const &mut (FnMut(T, &glib::Value) -> Result<T, T>);
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let value = &*(value as *const glib::Value);
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let accum = &mut *(gobject_ffi::g_value_get_pointer(ret) as *mut Option<T>);
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match (*func)(accum.take().unwrap(), value) {
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Ok(next_accum) => {
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*accum = Some(next_accum);
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glib_ffi::GTRUE
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}
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Err(next_accum) => {
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*accum = Some(next_accum);
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glib_ffi::GFALSE
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_vec() {
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::init().unwrap();
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let vec = vec![1i32, 2, 3];
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let mut it = Iterator::from_vec(vec);
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let val = it.next().unwrap();
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assert_eq!(val.get::<i32>().unwrap(), 1);
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let val = it.next().unwrap();
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assert_eq!(val.get::<i32>().unwrap(), 2);
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let val = it.next().unwrap();
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assert_eq!(val.get::<i32>().unwrap(), 3);
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assert_eq!(it.next().unwrap_err(), IteratorResult::Done);
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}
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#[test]
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fn test_filter() {
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::init().unwrap();
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let vec = vec![1i32, 2, 3];
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let mut it = Iterator::from_vec(vec).filter(|val| val.get::<i32>().unwrap() % 2 == 1);
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let val = it.next().unwrap();
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assert_eq!(val.get::<i32>().unwrap(), 1);
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let val = it.next().unwrap();
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assert_eq!(val.get::<i32>().unwrap(), 3);
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assert_eq!(it.next().unwrap_err(), IteratorResult::Done);
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}
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#[test]
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fn test_find() {
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::init().unwrap();
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let vec = vec![1i32, 2, 3];
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let val = Iterator::from_vec(vec).find(|val| val.get::<i32>().unwrap() == 2);
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assert_eq!(val.unwrap().get::<i32>().unwrap(), 2);
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}
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#[test]
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fn test_foreach() {
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::init().unwrap();
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let vec = vec![1i32, 2, 3];
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let mut sum = 0;
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let res = Iterator::from_vec(vec).foreach(|val| sum += val.get::<i32>().unwrap());
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assert_eq!(res, IteratorResult::Done);
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assert_eq!(sum, 6);
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}
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#[test]
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fn test_fold() {
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::init().unwrap();
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let vec = vec![1i32, 2, 3];
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let res = Iterator::from_vec(vec).fold(0, |mut sum, val| {
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sum += val.get::<i32>().unwrap();
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Ok(sum)
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});
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assert_eq!(res.unwrap(), 6);
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}
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}
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Reference in a new issue