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va: Use the GstVaSurfaceCopy of the allocator atomically.

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The mem_copy() of the allocator can be called simultaneously from
different threads. We should use atomic pointer operations to create
and use the GstVaSurfaceCopy of the allocator.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1373>
This commit is contained in:
He Junyan 2021-11-23 21:10:55 +08:00 committed by GStreamer Marge Bot
parent 7f31dcf084
commit 954f7cf88c
1 changed files with 30 additions and 11 deletions
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41
subprojects/gst-plugins-bad/sys/va/gstvaallocator.c
View file

@ -258,6 +258,27 @@ struct _GstVaDmabufAllocator
G_DEFINE_TYPE_WITH_CODE (GstVaDmabufAllocator, gst_va_dmabuf_allocator,
GST_TYPE_DMABUF_ALLOCATOR, _init_debug_category ());
static GstVaSurfaceCopy *
_ensure_surface_copy (GstVaSurfaceCopy ** old, GstVaDisplay * display,
GstVideoInfo * info)
{
GstVaSurfaceCopy *surface_copy;
surface_copy = g_atomic_pointer_get (old);
if (!surface_copy) {
surface_copy = gst_va_surface_copy_new (display, info);
/* others create a new one and set it before us */
if (surface_copy &&
!g_atomic_pointer_compare_and_exchange (old, NULL, surface_copy)) {
gst_va_surface_copy_free (surface_copy);
surface_copy = g_atomic_pointer_get (old);
}
}
return surface_copy;
}
/* If a buffer contains multiple memories (dmabuf objects) its very
* difficult to provide a realiable way to fast-copy single memories:
* While VA API sees surfaces with dependant dmabufs, GStreamer only
@ -294,6 +315,7 @@ gst_va_dmabuf_mem_copy (GstMemory * gmem, gssize offset, gssize size)
if (offset == 0 && size == mem_size && buf->n_mems == 1) {
GstVaBufferSurface *buf_copy = NULL;
GstMemory *copy;
GstVaSurfaceCopy *copy_func;
GST_VA_MEMORY_POOL_LOCK (&self->pool);
copy = gst_va_memory_pool_pop (&self->pool);
@ -325,9 +347,8 @@ gst_va_dmabuf_mem_copy (GstMemory * gmem, gssize offset, gssize size)
g_assert (buf_copy->n_mems == 1);
if (!self->copy)
self->copy = gst_va_surface_copy_new (self->display, &self->info);
if (self->copy && gst_va_surface_copy (self->copy, buf_copy->surface,
copy_func = _ensure_surface_copy (&self->copy, self->display, &self->info);
if (copy_func && gst_va_surface_copy (copy_func, buf_copy->surface,
buf->surface))
return copy;
@ -1283,15 +1304,13 @@ _va_copy (GstMemory * mem, gssize offset, gssize size)
size = mem_size > offset ? mem_size - offset : 0;
if (offset == 0 && size == mem_size) {
if (!va_allocator->copy) {
va_allocator->copy =
gst_va_surface_copy_new (va_allocator->display, &va_allocator->info);
}
if (va_allocator->copy
&& gst_va_surface_copy (va_allocator->copy, va_copy->surface,
va_mem->surface)) {
GstVaSurfaceCopy *copy_func;
copy_func = _ensure_surface_copy (&va_allocator->copy,
va_allocator->display, &va_allocator->info);
if (copy_func
&& gst_va_surface_copy (copy_func, va_copy->surface, va_mem->surface))
return copy;
}
}
if (!gst_memory_map (mem, &sinfo, GST_MAP_READ)) {