mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer-rs.git
synced 2024-05-15 06:42:44 +00:00
gstreamer: Optimize Buffer / Memory from_slice() to have fewer allocations
Instead of using `gst_memory_new_wrapped_full()` and boxing the data, create an GstAllocator subclass that allows allocating memories that store the data inline. By avoiding the box, one additional heap allocation per memory is avoided. Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/issues/498 Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1357>
This commit is contained in:
Sebastian Dröge
parent
a29d7c0e19
commit
ceed45cfd7
|
|
@ -33,6 +33,7 @@ pub struct MappedBuffer<T> {
|
|||
|
||||
impl Buffer {
|
||||
#[doc(alias = "gst_buffer_new")]
|
||||
#[inline]
|
||||
pub fn new() -> Self {
|
||||
assert_initialized_main_thread!();
|
||||
|
||||
|
|
@ -41,6 +42,7 @@ impl Buffer {
|
|||
|
||||
#[doc(alias = "gst_buffer_new_allocate")]
|
||||
#[doc(alias = "gst_buffer_new_and_alloc")]
|
||||
#[inline]
|
||||
pub fn with_size(size: usize) -> Result<Self, glib::BoolError> {
|
||||
assert_initialized_main_thread!();
|
||||
|
||||
|
|
@ -54,55 +56,38 @@ impl Buffer {
|
|||
}
|
||||
}
|
||||
|
||||
unsafe extern "C" fn drop_box<T>(vec: glib::ffi::gpointer) {
|
||||
let slice: Box<T> = Box::from_raw(vec as *mut T);
|
||||
drop(slice);
|
||||
}
|
||||
|
||||
#[doc(alias = "gst_buffer_new_wrapped")]
|
||||
#[doc(alias = "gst_buffer_new_wrapped_full")]
|
||||
#[inline]
|
||||
pub fn from_mut_slice<T: AsMut<[u8]> + Send + 'static>(slice: T) -> Self {
|
||||
assert_initialized_main_thread!();
|
||||
|
||||
unsafe {
|
||||
let mut b = Box::new(slice);
|
||||
let (size, data) = {
|
||||
let slice = (*b).as_mut();
|
||||
(slice.len(), slice.as_mut_ptr())
|
||||
};
|
||||
let user_data = Box::into_raw(b);
|
||||
from_glib_full(ffi::gst_buffer_new_wrapped_full(
|
||||
0,
|
||||
data as glib::ffi::gpointer,
|
||||
size,
|
||||
0,
|
||||
size,
|
||||
user_data as glib::ffi::gpointer,
|
||||
Some(Self::drop_box::<T>),
|
||||
))
|
||||
let mem = Memory::from_mut_slice(slice);
|
||||
let mut buffer = Buffer::new();
|
||||
{
|
||||
let buffer = buffer.get_mut().unwrap();
|
||||
buffer.append_memory(mem);
|
||||
buffer.unset_flags(BufferFlags::TAG_MEMORY);
|
||||
}
|
||||
|
||||
buffer
|
||||
}
|
||||
|
||||
#[doc(alias = "gst_buffer_new_wrapped")]
|
||||
#[doc(alias = "gst_buffer_new_wrapped_full")]
|
||||
#[inline]
|
||||
pub fn from_slice<T: AsRef<[u8]> + Send + 'static>(slice: T) -> Self {
|
||||
assert_initialized_main_thread!();
|
||||
|
||||
unsafe {
|
||||
let b = Box::new(slice);
|
||||
let (size, data) = {
|
||||
let slice = (*b).as_ref();
|
||||
(slice.len(), slice.as_ptr())
|
||||
};
|
||||
let user_data = Box::into_raw(b);
|
||||
from_glib_full(ffi::gst_buffer_new_wrapped_full(
|
||||
ffi::GST_MEMORY_FLAG_READONLY,
|
||||
data as glib::ffi::gpointer,
|
||||
size,
|
||||
0,
|
||||
size,
|
||||
user_data as glib::ffi::gpointer,
|
||||
Some(Self::drop_box::<T>),
|
||||
))
|
||||
let mem = Memory::from_slice(slice);
|
||||
let mut buffer = Buffer::new();
|
||||
{
|
||||
let buffer = buffer.get_mut().unwrap();
|
||||
buffer.append_memory(mem);
|
||||
buffer.unset_flags(BufferFlags::TAG_MEMORY);
|
||||
}
|
||||
|
||||
buffer
|
||||
}
|
||||
|
||||
#[doc(alias = "gst_buffer_map")]
|
||||
|
|
|
|||
|
|
@ -121,6 +121,7 @@ pub use crate::buffer::{
|
|||
mod buffer_cursor;
|
||||
pub use crate::buffer_cursor::{BufferCursor, BufferRefCursor};
|
||||
pub mod memory;
|
||||
mod memory_wrapped;
|
||||
pub use crate::memory::{MappedMemory, Memory, MemoryMap, MemoryRef};
|
||||
#[cfg(feature = "serde")]
|
||||
mod buffer_serde;
|
||||
|
|
|
|||
|
|
@ -53,11 +53,7 @@ pub enum Readable {}
|
|||
pub enum Writable {}
|
||||
|
||||
impl Memory {
|
||||
unsafe extern "C" fn drop_box<T>(vec: glib::ffi::gpointer) {
|
||||
let slice: Box<T> = Box::from_raw(vec as *mut T);
|
||||
drop(slice);
|
||||
}
|
||||
|
||||
#[inline]
|
||||
pub fn with_size(size: usize) -> Self {
|
||||
assert_initialized_main_thread!();
|
||||
unsafe {
|
||||
|
|
@ -69,6 +65,7 @@ impl Memory {
|
|||
}
|
||||
}
|
||||
|
||||
#[inline]
|
||||
pub fn with_size_and_params(size: usize, params: &AllocationParams) -> Self {
|
||||
assert_initialized_main_thread!();
|
||||
unsafe {
|
||||
|
|
@ -80,49 +77,6 @@ impl Memory {
|
|||
}
|
||||
}
|
||||
|
||||
pub fn from_slice<T: AsRef<[u8]> + Send + 'static>(slice: T) -> Self {
|
||||
assert_initialized_main_thread!();
|
||||
unsafe {
|
||||
let b = Box::new(slice);
|
||||
let (size, data) = {
|
||||
let slice = (*b).as_ref();
|
||||
(slice.len(), slice.as_ptr())
|
||||
};
|
||||
let user_data = Box::into_raw(b);
|
||||
from_glib_full(ffi::gst_memory_new_wrapped(
|
||||
ffi::GST_MEMORY_FLAG_READONLY,
|
||||
data as glib::ffi::gpointer,
|
||||
size,
|
||||
0,
|
||||
size,
|
||||
user_data as glib::ffi::gpointer,
|
||||
Some(Self::drop_box::<T>),
|
||||
))
|
||||
}
|
||||
}
|
||||
|
||||
pub fn from_mut_slice<T: AsMut<[u8]> + Send + 'static>(slice: T) -> Self {
|
||||
assert_initialized_main_thread!();
|
||||
|
||||
unsafe {
|
||||
let mut b = Box::new(slice);
|
||||
let (size, data) = {
|
||||
let slice = (*b).as_mut();
|
||||
(slice.len(), slice.as_mut_ptr())
|
||||
};
|
||||
let user_data = Box::into_raw(b);
|
||||
from_glib_full(ffi::gst_memory_new_wrapped(
|
||||
0,
|
||||
data as glib::ffi::gpointer,
|
||||
size,
|
||||
0,
|
||||
size,
|
||||
user_data as glib::ffi::gpointer,
|
||||
Some(Self::drop_box::<T>),
|
||||
))
|
||||
}
|
||||
}
|
||||
|
||||
#[inline]
|
||||
pub fn into_mapped_memory_readable(self) -> Result<MappedMemory<Readable>, Self> {
|
||||
unsafe {
|
||||
|
|
@ -948,6 +902,22 @@ mod tests {
|
|||
assert_eq!(map.as_slice(), &[1, 2, 3, 4]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_share() {
|
||||
crate::init().unwrap();
|
||||
|
||||
let mem = crate::Memory::from_slice(vec![1, 2, 3, 4]);
|
||||
let sub = mem.share(1, Some(2));
|
||||
|
||||
let map = mem.map_readable().unwrap();
|
||||
assert_eq!(map.as_slice(), &[1, 2, 3, 4]);
|
||||
drop(map);
|
||||
|
||||
let map = sub.map_readable().unwrap();
|
||||
assert_eq!(map.as_slice(), &[2, 3]);
|
||||
drop(map);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_dump() {
|
||||
crate::init().unwrap();
|
||||
|
|
|
|||
278
gstreamer/src/memory_wrapped.rs
Normal file
278
gstreamer/src/memory_wrapped.rs
Normal file
|
|
@ -0,0 +1,278 @@
|
|||
// Take a look at the license at the top of the repository in the LICENSE file.
|
||||
|
||||
use glib::{once_cell::sync::Lazy, translate::*, StaticType};
|
||||
|
||||
use std::{alloc, mem, ptr};
|
||||
|
||||
use crate::Memory;
|
||||
|
||||
#[repr(C)]
|
||||
struct WrappedMemory<T> {
|
||||
mem: ffi::GstMemory,
|
||||
|
||||
// AsRef / AsMut values
|
||||
data: *mut u8,
|
||||
|
||||
// Layout used for allocating this struct, literally `Layout::new<Self>`
|
||||
layout: alloc::Layout,
|
||||
|
||||
// Offset from the beginning of the struct until `wrap`
|
||||
wrap_offset: usize,
|
||||
// `ptr::drop_in_place()` for `T`
|
||||
wrap_drop_in_place: unsafe fn(*mut T),
|
||||
wrap: T,
|
||||
}
|
||||
|
||||
unsafe extern "C" fn free(_allocator: *mut ffi::GstAllocator, mem: *mut ffi::GstMemory) {
|
||||
let mem = mem as *mut WrappedMemory<()>;
|
||||
|
||||
if (*mem).wrap_offset > 0 {
|
||||
let wrap = (mem as *mut u8).add((*mem).wrap_offset) as *mut ();
|
||||
((*mem).wrap_drop_in_place)(wrap);
|
||||
}
|
||||
|
||||
alloc::dealloc(mem as *mut u8, (*mem).layout);
|
||||
}
|
||||
|
||||
unsafe extern "C" fn mem_map(
|
||||
mem: *mut ffi::GstMemory,
|
||||
_maxsize: usize,
|
||||
_flags: ffi::GstMapFlags,
|
||||
) -> glib::ffi::gpointer {
|
||||
let mem = mem as *mut WrappedMemory<()>;
|
||||
|
||||
(*mem).data as glib::ffi::gpointer
|
||||
}
|
||||
|
||||
unsafe extern "C" fn mem_unmap(_mem: *mut ffi::GstMemory) {}
|
||||
|
||||
unsafe extern "C" fn mem_share(
|
||||
mem: *mut ffi::GstMemory,
|
||||
offset: isize,
|
||||
size: isize,
|
||||
) -> *mut ffi::GstMemory {
|
||||
let mem = mem as *mut WrappedMemory<()>;
|
||||
|
||||
// Basically a re-implementation of _sysmem_share()
|
||||
|
||||
let parent = if (*mem).mem.parent.is_null() {
|
||||
mem
|
||||
} else {
|
||||
(*mem).mem.parent as *mut WrappedMemory<()>
|
||||
};
|
||||
|
||||
// Actually an usize
|
||||
let mut size = size as usize;
|
||||
if size == usize::MAX {
|
||||
if offset < 0 {
|
||||
size = (*mem).mem.size + (-offset as usize);
|
||||
} else {
|
||||
debug_assert!((*mem).mem.size >= offset as usize);
|
||||
size = (*mem).mem.size - offset as usize;
|
||||
}
|
||||
}
|
||||
|
||||
let new_offset = if offset < 0 {
|
||||
debug_assert!((*mem).mem.offset >= (-offset as usize));
|
||||
(*mem).mem.offset - (-offset as usize)
|
||||
} else {
|
||||
(*mem).mem.offset + offset as usize
|
||||
};
|
||||
|
||||
debug_assert!(new_offset + size <= (*mem).mem.maxsize);
|
||||
|
||||
let layout = alloc::Layout::new::<WrappedMemory<()>>();
|
||||
let sub = alloc::alloc(layout) as *mut WrappedMemory<()>;
|
||||
|
||||
ffi::gst_memory_init(
|
||||
sub as *mut ffi::GstMemory,
|
||||
(*mem).mem.mini_object.flags | ffi::GST_MINI_OBJECT_FLAG_LOCK_READONLY,
|
||||
(*mem).mem.allocator,
|
||||
parent as *mut ffi::GstMemory,
|
||||
(*mem).mem.maxsize,
|
||||
(*mem).mem.align,
|
||||
new_offset,
|
||||
size,
|
||||
);
|
||||
ptr::write(ptr::addr_of_mut!((*sub).data), (*mem).data);
|
||||
ptr::write(ptr::addr_of_mut!((*sub).layout), layout);
|
||||
ptr::write(ptr::addr_of_mut!((*sub).wrap_offset), 0);
|
||||
ptr::write(ptr::addr_of_mut!((*sub).wrap_drop_in_place), |_| ());
|
||||
|
||||
sub as *mut ffi::GstMemory
|
||||
}
|
||||
|
||||
unsafe extern "C" fn mem_is_span(
|
||||
mem1: *mut ffi::GstMemory,
|
||||
mem2: *mut ffi::GstMemory,
|
||||
offset: *mut usize,
|
||||
) -> glib::ffi::gboolean {
|
||||
let mem1 = mem1 as *mut WrappedMemory<()>;
|
||||
let mem2 = mem2 as *mut WrappedMemory<()>;
|
||||
|
||||
// Basically a re-implementation of _sysmem_is_span()
|
||||
if !offset.is_null() {
|
||||
let parent = (*mem1).mem.parent as *mut WrappedMemory<()>;
|
||||
*offset = (*mem1).mem.offset - (*parent).mem.offset;
|
||||
}
|
||||
|
||||
let is_span = (*mem1).data.add((*mem1).mem.offset).add((*mem1).mem.size)
|
||||
== (*mem2).data.add((*mem2).mem.offset);
|
||||
|
||||
is_span.into_glib()
|
||||
}
|
||||
|
||||
unsafe extern "C" fn class_init(class: glib::ffi::gpointer, _class_data: glib::ffi::gpointer) {
|
||||
let class = class as *mut ffi::GstAllocatorClass;
|
||||
|
||||
(*class).free = Some(free);
|
||||
}
|
||||
|
||||
unsafe extern "C" fn instance_init(
|
||||
obj: *mut glib::gobject_ffi::GTypeInstance,
|
||||
_class: glib::ffi::gpointer,
|
||||
) {
|
||||
static ALLOCATOR_TYPE: &[u8] = b"RustGlobalAllocatorMemory\0";
|
||||
|
||||
let allocator = obj as *mut ffi::GstAllocator;
|
||||
|
||||
(*allocator).mem_type = ALLOCATOR_TYPE.as_ptr() as *const _;
|
||||
(*allocator).mem_map = Some(mem_map);
|
||||
(*allocator).mem_unmap = Some(mem_unmap);
|
||||
// mem_copy not set because the fallback already does the right thing
|
||||
(*allocator).mem_share = Some(mem_share);
|
||||
(*allocator).mem_is_span = Some(mem_is_span);
|
||||
|
||||
// TODO: Could also implement alloc()
|
||||
(*allocator).object.flags |= ffi::GST_ALLOCATOR_FLAG_CUSTOM_ALLOC;
|
||||
}
|
||||
|
||||
static RUST_ALLOCATOR: Lazy<crate::Allocator> = Lazy::new(|| unsafe {
|
||||
struct TypeInfoWrap(glib::gobject_ffi::GTypeInfo);
|
||||
unsafe impl Send for TypeInfoWrap {}
|
||||
unsafe impl Sync for TypeInfoWrap {}
|
||||
|
||||
static TYPE_INFO: TypeInfoWrap = TypeInfoWrap(glib::gobject_ffi::GTypeInfo {
|
||||
class_size: mem::size_of::<ffi::GstAllocatorClass>() as u16,
|
||||
base_init: None,
|
||||
base_finalize: None,
|
||||
class_init: Some(class_init),
|
||||
class_finalize: None,
|
||||
class_data: ptr::null_mut(),
|
||||
instance_size: mem::size_of::<ffi::GstAllocator>() as u16,
|
||||
n_preallocs: 0,
|
||||
instance_init: Some(instance_init),
|
||||
value_table: ptr::null(),
|
||||
});
|
||||
|
||||
let type_name = {
|
||||
let mut idx = 0;
|
||||
|
||||
loop {
|
||||
let type_name = glib::gformat!("GstRsAllocator-{}", idx);
|
||||
if glib::gobject_ffi::g_type_from_name(type_name.as_ptr())
|
||||
== glib::gobject_ffi::G_TYPE_INVALID
|
||||
{
|
||||
break type_name;
|
||||
}
|
||||
idx += 1;
|
||||
}
|
||||
};
|
||||
|
||||
let t = glib::gobject_ffi::g_type_register_static(
|
||||
crate::Allocator::static_type().into_glib(),
|
||||
type_name.as_ptr(),
|
||||
&TYPE_INFO.0,
|
||||
0,
|
||||
);
|
||||
|
||||
assert!(t != glib::gobject_ffi::G_TYPE_INVALID);
|
||||
|
||||
from_glib_none(glib::gobject_ffi::g_object_newv(t, 0, ptr::null_mut()) as *mut ffi::GstAllocator)
|
||||
});
|
||||
|
||||
impl Memory {
|
||||
#[doc(alias = "gst_memory_new_wrapped")]
|
||||
#[doc(alias = "gst_memory_new_wrapped_full")]
|
||||
#[inline]
|
||||
pub fn from_slice<T: AsRef<[u8]> + Send + 'static>(slice: T) -> Self {
|
||||
assert_initialized_main_thread!();
|
||||
|
||||
let len = slice.as_ref().len();
|
||||
unsafe {
|
||||
let layout = alloc::Layout::new::<WrappedMemory<T>>();
|
||||
let mem = alloc::alloc(layout) as *mut WrappedMemory<T>;
|
||||
|
||||
ffi::gst_memory_init(
|
||||
mem as *mut ffi::GstMemory,
|
||||
ffi::GST_MINI_OBJECT_FLAG_LOCK_READONLY,
|
||||
RUST_ALLOCATOR.to_glib_none().0,
|
||||
ptr::null_mut(),
|
||||
len,
|
||||
0,
|
||||
0,
|
||||
len,
|
||||
);
|
||||
|
||||
ptr::write(ptr::addr_of_mut!((*mem).wrap), slice);
|
||||
|
||||
assert_eq!(len, (*mem).wrap.as_ref().len());
|
||||
let data = (*mem).wrap.as_ref().as_ptr();
|
||||
ptr::write(ptr::addr_of_mut!((*mem).data), mut_override(data));
|
||||
|
||||
ptr::write(ptr::addr_of_mut!((*mem).layout), layout);
|
||||
|
||||
let wrap_offset = ptr::addr_of!((*mem).wrap) as usize - mem as usize;
|
||||
ptr::write(ptr::addr_of_mut!((*mem).wrap_offset), wrap_offset);
|
||||
|
||||
ptr::write(
|
||||
ptr::addr_of_mut!((*mem).wrap_drop_in_place),
|
||||
ptr::drop_in_place::<T>,
|
||||
);
|
||||
|
||||
from_glib_full(mem as *mut ffi::GstMemory)
|
||||
}
|
||||
}
|
||||
|
||||
#[doc(alias = "gst_memory_new_wrapped")]
|
||||
#[doc(alias = "gst_memory_new_wrapped_full")]
|
||||
#[inline]
|
||||
pub fn from_mut_slice<T: AsMut<[u8]> + Send + 'static>(mut slice: T) -> Self {
|
||||
assert_initialized_main_thread!();
|
||||
|
||||
let len = slice.as_mut().len();
|
||||
unsafe {
|
||||
let layout = alloc::Layout::new::<WrappedMemory<T>>();
|
||||
let mem = alloc::alloc(layout) as *mut WrappedMemory<T>;
|
||||
|
||||
ffi::gst_memory_init(
|
||||
mem as *mut ffi::GstMemory,
|
||||
0,
|
||||
RUST_ALLOCATOR.to_glib_none().0,
|
||||
ptr::null_mut(),
|
||||
len,
|
||||
0,
|
||||
0,
|
||||
len,
|
||||
);
|
||||
|
||||
ptr::write(ptr::addr_of_mut!((*mem).wrap), slice);
|
||||
|
||||
assert_eq!(len, (*mem).wrap.as_mut().len());
|
||||
let data = (*mem).wrap.as_mut().as_mut_ptr();
|
||||
ptr::write(ptr::addr_of_mut!((*mem).data), data);
|
||||
|
||||
ptr::write(ptr::addr_of_mut!((*mem).layout), layout);
|
||||
|
||||
let wrap_offset = ptr::addr_of!((*mem).wrap) as usize - mem as usize;
|
||||
ptr::write(ptr::addr_of_mut!((*mem).wrap_offset), wrap_offset);
|
||||
|
||||
ptr::write(
|
||||
ptr::addr_of_mut!((*mem).wrap_drop_in_place),
|
||||
ptr::drop_in_place::<T>,
|
||||
);
|
||||
|
||||
from_glib_full(mem as *mut ffi::GstMemory)
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Reference in a new issue