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GstShmAllocator: Respect allocation params

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Sponsored-by: Netflix Inc.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5328>
This commit is contained in:
Xavier Claessens 2023-09-18 14:38:25 -04:00 committed by GStreamer Marge Bot
parent f57dabe65c
commit 5b4d37d6f2
1 changed files with 27 additions and 2 deletions
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29
subprojects/gst-plugins-base/gst-libs/gst/allocators/gstshmallocator.c
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@ -58,7 +58,11 @@ gst_shm_allocator_alloc (GstAllocator * allocator, gsize size,
GstMemory *mem;
GstMapInfo info;
/* TODO: make use of the allocation params, if necessary */
/* See _sysmem_new_block() for details */
gsize maxsize = size + params->prefix + params->padding;
gsize align = params->align;
align |= gst_memory_alignment;
maxsize += align;
#ifdef HAVE_MEMFD_CREATE
fd = memfd_create ("gst-shm", MFD_CLOEXEC | MFD_ALLOW_SEALING);
@ -84,7 +88,7 @@ gst_shm_allocator_alloc (GstAllocator * allocator, gsize size,
}
#endif
if (ftruncate (fd, size) < 0) {
if (ftruncate (fd, maxsize) < 0) {
GST_ERROR_OBJECT (self, "ftruncate failed: %s", strerror (errno));
close (fd);
return NULL;
@ -104,6 +108,27 @@ gst_shm_allocator_alloc (GstAllocator * allocator, gsize size,
gst_memory_unref (mem);
return NULL;
}
/* See _sysmem_new_block() for details */
guint8 *data = info.data;
gsize aoffset;
if ((aoffset = ((guintptr) data & align))) {
aoffset = (align + 1) - aoffset;
data += aoffset;
maxsize -= aoffset;
}
if (params->prefix && (params->flags & GST_MEMORY_FLAG_ZERO_PREFIXED))
memset (data, 0, params->prefix);
gsize padding = maxsize - (params->prefix + size);
if (padding && (params->flags & GST_MEMORY_FLAG_ZERO_PADDED))
memset (data + params->prefix + size, 0, padding);
mem->align = align;
mem->maxsize = maxsize;
mem->offset = params->prefix + aoffset;
gst_memory_unmap (mem, &info);
#ifdef HAVE_MEMFD_CREATE