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gstreamer-base: Allow filling a passed in buffer in PushSrc::create()

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Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/issues/277
This commit is contained in:
Sebastian Dröge 2021-09-19 15:44:23 +03:00 committed by Sebastian Dröge
parent a1c4a58180
commit c66287843f
1 changed files with 138 additions and 15 deletions
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153
gstreamer-base/src/subclass/push_src.rs
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@ -4,9 +4,11 @@ use glib::prelude::*;
use glib::subclass::prelude::*;
use glib::translate::*;
use gst::{gst_debug, gst_error};
use std::ptr;
use super::base_src::BaseSrcImpl;
use super::base_src::{BaseSrcImpl, CreateSuccess};
use crate::PushSrc;
pub trait PushSrcImpl: PushSrcImplExt + BaseSrcImpl {
@ -22,8 +24,12 @@ pub trait PushSrcImpl: PushSrcImplExt + BaseSrcImpl {
PushSrcImplExt::parent_alloc(self, element)
}
fn create(&self, element: &Self::Type) -> Result<gst::Buffer, gst::FlowError> {
PushSrcImplExt::parent_create(self, element)
fn create(
&self,
element: &Self::Type,
buffer: Option<&mut gst::BufferRef>,
) -> Result<CreateSuccess, gst::FlowError> {
PushSrcImplExt::parent_create(self, element, buffer)
}
}
@ -36,7 +42,11 @@ pub trait PushSrcImplExt: ObjectSubclass {
fn parent_alloc(&self, element: &Self::Type) -> Result<gst::Buffer, gst::FlowError>;
fn parent_create(&self, element: &Self::Type) -> Result<gst::Buffer, gst::FlowError>;
fn parent_create(
&self,
element: &Self::Type,
buffer: Option<&mut gst::BufferRef>,
) -> Result<CreateSuccess, gst::FlowError>;
}
impl<T: PushSrcImpl> PushSrcImplExt for T {
@ -83,24 +93,81 @@ impl<T: PushSrcImpl> PushSrcImplExt for T {
}
}
fn parent_create(&self, element: &Self::Type) -> Result<gst::Buffer, gst::FlowError> {
fn parent_create(
&self,
element: &Self::Type,
mut buffer: Option<&mut gst::BufferRef>,
) -> Result<CreateSuccess, gst::FlowError> {
unsafe {
let data = Self::type_data();
let parent_class = data.as_ref().parent_class() as *mut ffi::GstPushSrcClass;
(*parent_class)
.create
.map(|f| {
let mut buffer_ptr: *mut gst::ffi::GstBuffer = ptr::null_mut();
let orig_buffer_ptr = buffer
.as_mut()
.map(|b| b.as_mut_ptr())
.unwrap_or(ptr::null_mut());
let mut buffer_ptr = orig_buffer_ptr;
// FIXME: Wrong signature in -sys bindings
// https://gitlab.freedesktop.org/gstreamer/gstreamer-rs-sys/issues/3
let buffer_ref = &mut buffer_ptr as *mut _ as *mut gst::ffi::GstBuffer;
gst::FlowSuccess::try_from_glib(f(
element.unsafe_cast_ref::<PushSrc>().to_glib_none().0,
buffer_ref,
))
.map(|_| from_glib_full(buffer_ref))
gst::FlowSuccess::try_from_glib(
f(
element.unsafe_cast_ref::<PushSrc>().to_glib_none().0,
buffer_ref,
)
)?;
if let Some(passed_buffer) = buffer {
if buffer_ptr != orig_buffer_ptr {
let new_buffer = gst::BufferRef::from_ptr(buffer_ptr);
gst_debug!(
gst::CAT_PERFORMANCE,
obj: element.unsafe_cast_ref::<PushSrc>(),
"Returned new buffer from parent create function, copying into passed buffer"
);
let mut map = match passed_buffer.map_writable() {
Ok(map) => map,
Err(_) => {
gst_error!(
gst::CAT_RUST,
obj: element.unsafe_cast_ref::<PushSrc>(),
"Failed to map passed buffer writable"
);
return Err(gst::FlowError::Error);
}
};
let copied_size = new_buffer.copy_to_slice(0, &mut *map);
drop(map);
if let Err(copied_size) = copied_size {
passed_buffer.set_size(copied_size);
}
match new_buffer.copy_into(passed_buffer, gst::BUFFER_COPY_METADATA, 0, None) {
Ok(_) => Ok(CreateSuccess::FilledBuffer),
Err(_) => {
gst_error!(
gst::CAT_RUST,
obj: element.unsafe_cast_ref::<PushSrc>(),
"Failed to copy buffer metadata"
);
Err(gst::FlowError::Error)
}
}
} else {
Ok(CreateSuccess::FilledBuffer)
}
} else {
Ok(CreateSuccess::NewBuffer(from_glib_full(buffer_ptr)))
}
})
.unwrap_or(Err(gst::FlowError::NotSupported))
}
@ -170,12 +237,68 @@ unsafe extern "C" fn push_src_create<T: PushSrcImpl>(
// https://gitlab.freedesktop.org/gstreamer/gstreamer-rs-sys/issues/3
let buffer_ptr = buffer_ptr as *mut *mut gst::ffi::GstBuffer;
let mut buffer = if (*buffer_ptr).is_null() {
None
} else {
Some(gst::BufferRef::from_mut_ptr(*buffer_ptr))
};
gst::panic_to_error!(&wrap, imp.panicked(), gst::FlowReturn::Error, {
match PushSrcImpl::create(imp, wrap.unsafe_cast_ref()) {
Ok(buffer) => {
*buffer_ptr = buffer.into_ptr();
gst::FlowReturn::Ok
match PushSrcImpl::create(imp, wrap.unsafe_cast_ref(), buffer.as_deref_mut()) {
Ok(CreateSuccess::NewBuffer(new_buffer)) => {
if let Some(passed_buffer) = buffer {
if passed_buffer.as_ptr() != new_buffer.as_ptr() {
gst_debug!(
gst::CAT_PERFORMANCE,
obj: &*wrap,
"Returned new buffer from create function, copying into passed buffer"
);
let mut map = match passed_buffer.map_writable() {
Ok(map) => map,
Err(_) => {
gst_error!(
gst::CAT_RUST,
obj: &*wrap,
"Failed to map passed buffer writable"
);
return gst::FlowReturn::Error;
}
};
let copied_size = new_buffer.copy_to_slice(0, &mut *map);
drop(map);
if let Err(copied_size) = copied_size {
passed_buffer.set_size(copied_size);
}
match new_buffer.copy_into(
passed_buffer,
gst::BUFFER_COPY_METADATA,
0,
None,
) {
Ok(_) => gst::FlowReturn::Ok,
Err(_) => {
gst_error!(
gst::CAT_RUST,
obj: &*wrap,
"Failed to copy buffer metadata"
);
gst::FlowReturn::Error
}
}
} else {
gst::FlowReturn::Ok
}
} else {
*buffer_ptr = new_buffer.into_ptr();
gst::FlowReturn::Ok
}
}
Ok(CreateSuccess::FilledBuffer) => gst::FlowReturn::Ok,
Err(err) => gst::FlowReturn::from(err),
}
})