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gstreamer/buffer: Add bindings for foreach_meta() and foreach_meta_mut()

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Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/issues/268
This commit is contained in:
Sebastian Dröge 2020-07-03 10:27:14 +03:00
parent f01b590a0c
commit 01eaf76b31
1 changed files with 134 additions and 0 deletions
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134
gstreamer/src/buffer.rs
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@ -426,6 +426,63 @@ impl BufferRef {
MetaIterMut::new(self)
}
pub fn foreach_meta<F: FnMut(MetaRef<Meta>) -> bool>(&self, func: F) -> bool {
unsafe extern "C" fn trampoline<F: FnMut(MetaRef<Meta>) -> bool>(
buffer: *mut gst_sys::GstBuffer,
meta: *mut *mut gst_sys::GstMeta,
user_data: glib_sys::gpointer,
) -> glib_sys::gboolean {
let func = user_data as *const _ as usize as *mut F;
let res = (*func)(Meta::from_ptr(BufferRef::from_ptr(buffer), *meta));
res.to_glib()
}
unsafe {
let func_ptr: &F = &func;
from_glib(gst_sys::gst_buffer_foreach_meta(
self.as_ptr() as *mut _,
Some(trampoline::<F>),
func_ptr as *const _ as usize as *mut _,
))
}
}
pub fn foreach_meta_mut<F: FnMut(MetaRefMut<Meta, ::meta::Iterated>) -> Result<bool, bool>>(
&mut self,
func: F,
) -> bool {
unsafe extern "C" fn trampoline<
F: FnMut(MetaRefMut<Meta, ::meta::Iterated>) -> Result<bool, bool>,
>(
buffer: *mut gst_sys::GstBuffer,
meta: *mut *mut gst_sys::GstMeta,
user_data: glib_sys::gpointer,
) -> glib_sys::gboolean {
let func = user_data as *const _ as usize as *mut F;
let res = (*func)(Meta::from_mut_ptr(BufferRef::from_mut_ptr(buffer), *meta));
match res {
Ok(false) | Err(false) => {
*meta = ptr::null_mut();
res.is_ok().to_glib()
}
Ok(true) | Err(true) => res.is_ok().to_glib(),
}
}
unsafe {
let func_ptr: &F = &func;
from_glib(gst_sys::gst_buffer_foreach_meta(
self.as_ptr() as *mut _,
Some(trampoline::<F>),
func_ptr as *const _ as usize as *mut _,
))
}
}
pub fn append_memory(&mut self, mem: Memory) {
unsafe { gst_sys::gst_buffer_append_memory(self.as_mut_ptr(), mem.into_ptr()) }
}
@ -1235,4 +1292,81 @@ mod tests {
assert_eq!(last, 4);
}
#[cfg(any(feature = "v1_14", feature = "dox"))]
#[test]
fn test_meta_foreach() {
::init().unwrap();
let mut buffer = Buffer::new();
{
let buffer = buffer.get_mut().unwrap();
::ReferenceTimestampMeta::add(
buffer,
&::Caps::builder("foo/bar").build(),
::ClockTime::from(0),
::CLOCK_TIME_NONE,
);
::ReferenceTimestampMeta::add(
buffer,
&::Caps::builder("foo/bar").build(),
::SECOND,
::CLOCK_TIME_NONE,
);
}
let mut res = vec![];
buffer.foreach_meta(|meta| {
let meta = meta.downcast_ref::<::ReferenceTimestampMeta>().unwrap();
res.push(meta.get_timestamp());
true
});
assert_eq!(&[::ClockTime::from(0), ::SECOND][..], &res[..]);
}
#[cfg(any(feature = "v1_14", feature = "dox"))]
#[test]
fn test_meta_foreach_mut() {
::init().unwrap();
let mut buffer = Buffer::new();
{
let buffer = buffer.get_mut().unwrap();
::ReferenceTimestampMeta::add(
buffer,
&::Caps::builder("foo/bar").build(),
::ClockTime::from(0),
::CLOCK_TIME_NONE,
);
::ReferenceTimestampMeta::add(
buffer,
&::Caps::builder("foo/bar").build(),
::SECOND,
::CLOCK_TIME_NONE,
);
}
let mut res = vec![];
buffer.get_mut().unwrap().foreach_meta_mut(|mut meta| {
let meta = meta.downcast_ref::<::ReferenceTimestampMeta>().unwrap();
res.push(meta.get_timestamp());
if meta.get_timestamp() == ::SECOND {
Ok(false)
} else {
Ok(true)
}
});
assert_eq!(&[::ClockTime::from(0), ::SECOND][..], &res[..]);
let mut res = vec![];
buffer.foreach_meta(|meta| {
let meta = meta.downcast_ref::<::ReferenceTimestampMeta>().unwrap();
res.push(meta.get_timestamp());
true
});
assert_eq!(&[::ClockTime::from(0)][..], &res[..]);
}
}