use std::ptr;
use glib::{prelude::*, subclass::prelude::*, translate::*};
use gst::{prelude::*, subclass::prelude::*};
use super::base_src::{BaseSrcImpl, CreateSuccess};
use crate::{PushSrc, ffi, prelude::*};
pub trait PushSrcImpl: BaseSrcImpl + ObjectSubclass<Type: IsA<PushSrc>> {
fn fill(&self, buffer: &mut gst::BufferRef) -> Result<gst::FlowSuccess, gst::FlowError> {
PushSrcImplExt::parent_fill(self, buffer)
}
fn alloc(&self) -> Result<gst::Buffer, gst::FlowError> {
PushSrcImplExt::parent_alloc(self)
}
fn create(&self, buffer: Option<&mut gst::BufferRef>) -> Result<CreateSuccess, gst::FlowError> {
PushSrcImplExt::parent_create(self, buffer)
}
}
pub trait PushSrcImplExt: PushSrcImpl {
fn parent_fill(&self, buffer: &mut gst::BufferRef) -> Result<gst::FlowSuccess, gst::FlowError> {
unsafe {
let data = Self::type_data();
let parent_class = data.as_ref().parent_class() as *mut ffi::GstPushSrcClass;
(*parent_class)
.fill
.map(|f| {
try_from_glib(f(
self.obj().unsafe_cast_ref::<PushSrc>().to_glib_none().0,
buffer.as_mut_ptr(),
))
})
.unwrap_or(Err(gst::FlowError::NotSupported))
}
}
fn parent_alloc(&self) -> Result<gst::Buffer, gst::FlowError> {
unsafe {
let data = Self::type_data();
let parent_class = data.as_ref().parent_class() as *mut ffi::GstPushSrcClass;
(*parent_class)
.alloc
.map(|f| {
let mut buffer_ptr: *mut gst::ffi::GstBuffer = ptr::null_mut();
let buffer_ref = &mut buffer_ptr as *mut _ as *mut gst::ffi::GstBuffer;
gst::FlowSuccess::try_from_glib(f(
self.obj().unsafe_cast_ref::<PushSrc>().to_glib_none().0,
buffer_ref,
))
.map(|_| from_glib_full(buffer_ref))
})
.unwrap_or(Err(gst::FlowError::NotSupported))
}
}
fn parent_create(
&self,
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 instance = self.obj();
let instance = instance.unsafe_cast_ref::<PushSrc>();
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;
let buffer_ref = &mut buffer_ptr as *mut _ as *mut gst::ffi::GstBuffer;
let instance_data = self.instance_data::<super::base_src::InstanceData>(crate::BaseSrc::static_type()).unwrap();
if let Err(err) = gst::FlowSuccess::try_from_glib(
f(
instance.to_glib_none().0,
buffer_ref,
)
) {
*instance_data.pending_buffer_list.borrow_mut() = None;
return Err(err);
}
let pending_buffer_list = instance_data.pending_buffer_list.borrow_mut().take();
if pending_buffer_list.is_some() &&
(buffer.is_some() || instance.src_pad().mode() == gst::PadMode::Pull) {
panic!("Buffer lists can only be returned in push mode");
}
let pending_buffer_list = instance_data.pending_buffer_list.borrow_mut().take();
if buffer_ptr.is_null() && pending_buffer_list.is_none() {
gst::error!(
gst::CAT_RUST,
obj = instance,
"No buffer and no buffer list returned"
);
return Err(gst::FlowError::Error);
}
if !buffer_ptr.is_null() && pending_buffer_list.is_some() {
gst::error!(
gst::CAT_RUST,
obj = instance,
"Both buffer and buffer list returned"
);
return Err(gst::FlowError::Error);
}
if let Some(passed_buffer) = buffer {
if buffer_ptr != orig_buffer_ptr {
let new_buffer = gst::Buffer::from_glib_full(buffer_ptr);
gst::debug!(
gst::CAT_PERFORMANCE,
obj = instance,
"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 = instance,
"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, ..) {
Ok(_) => Ok(CreateSuccess::FilledBuffer),
Err(_) => {
gst::error!(
gst::CAT_RUST,
obj = instance,
"Failed to copy buffer metadata"
);
Err(gst::FlowError::Error)
}
}
} else {
Ok(CreateSuccess::FilledBuffer)
}
} else if let Some(buffer_list) = pending_buffer_list {
Ok(CreateSuccess::NewBufferList(buffer_list))
} else {
Ok(CreateSuccess::NewBuffer(from_glib_full(buffer_ptr)))
}
})
.unwrap_or(Err(gst::FlowError::NotSupported))
}
}
}
impl<T: PushSrcImpl> PushSrcImplExt for T {}
unsafe impl<T: PushSrcImpl> IsSubclassable<T> for PushSrc {
fn class_init(klass: &mut glib::Class<Self>) {
Self::parent_class_init::<T>(klass);
let klass = klass.as_mut();
klass.fill = Some(push_src_fill::<T>);
klass.alloc = Some(push_src_alloc::<T>);
klass.create = Some(push_src_create::<T>);
}
}
unsafe extern "C" fn push_src_fill<T: PushSrcImpl>(
ptr: *mut ffi::GstPushSrc,
buffer: *mut gst::ffi::GstBuffer,
) -> gst::ffi::GstFlowReturn {
unsafe {
let instance = &*(ptr as *mut T::Instance);
let imp = instance.imp();
let buffer = gst::BufferRef::from_mut_ptr(buffer);
gst::panic_to_error!(imp, gst::FlowReturn::Error, {
PushSrcImpl::fill(imp, buffer).into()
})
.into_glib()
}
}
unsafe extern "C" fn push_src_alloc<T: PushSrcImpl>(
ptr: *mut ffi::GstPushSrc,
buffer_ptr: *mut gst::ffi::GstBuffer,
) -> gst::ffi::GstFlowReturn {
unsafe {
let instance = &*(ptr as *mut T::Instance);
let imp = instance.imp();
let buffer_ptr = buffer_ptr as *mut *mut gst::ffi::GstBuffer;
gst::panic_to_error!(imp, gst::FlowReturn::Error, {
match PushSrcImpl::alloc(imp) {
Ok(buffer) => {
*buffer_ptr = buffer.into_glib_ptr();
gst::FlowReturn::Ok
}
Err(err) => gst::FlowReturn::from(err),
}
})
.into_glib()
}
}
#[allow(clippy::needless_option_as_deref)]
unsafe extern "C" fn push_src_create<T: PushSrcImpl>(
ptr: *mut ffi::GstPushSrc,
buffer_ptr: *mut gst::ffi::GstBuffer,
) -> gst::ffi::GstFlowReturn {
unsafe {
let instance = &*(ptr as *mut T::Instance);
let imp = instance.imp();
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))
};
let instance_data = imp
.instance_data::<super::base_src::InstanceData>(crate::BaseSrc::static_type())
.unwrap();
gst::panic_to_error!(imp, gst::FlowReturn::Error, {
match PushSrcImpl::create(imp, buffer.as_deref_mut()) {
Ok(CreateSuccess::NewBuffer(new_buffer)) => {
*instance_data.pending_buffer_list.borrow_mut() = None;
if let Some(passed_buffer) = buffer {
if passed_buffer.as_ptr() != new_buffer.as_ptr() {
gst::debug!(
gst::CAT_PERFORMANCE,
imp = imp,
"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,
imp = imp,
"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, ..)
{
Ok(_) => gst::FlowReturn::Ok,
Err(_) => {
gst::error!(
gst::CAT_RUST,
imp = imp,
"Failed to copy buffer metadata"
);
gst::FlowReturn::Error
}
}
} else {
gst::FlowReturn::Ok
}
} else {
*buffer_ptr = new_buffer.into_glib_ptr();
gst::FlowReturn::Ok
}
}
Ok(CreateSuccess::NewBufferList(new_buffer_list)) => {
if buffer.is_some()
|| imp.obj().unsafe_cast_ref::<PushSrc>().src_pad().mode()
== gst::PadMode::Pull
{
panic!("Buffer lists can only be returned in push mode");
}
*buffer_ptr = ptr::null_mut();
*instance_data.pending_buffer_list.borrow_mut() = Some(new_buffer_list);
gst::FlowReturn::Ok
}
Ok(CreateSuccess::FilledBuffer) => {
*instance_data.pending_buffer_list.borrow_mut() = None;
gst::FlowReturn::Ok
}
Err(err) => gst::FlowReturn::from(err),
}
})
.into_glib()
}
}