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v4l2object: Provide padding requirements during propose allocation

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If the driver has size alignment requirement, suggest the
difference between aligned size required by diver and the actual
size of the frame as padding requirement to the upstream element.

This will ensure that the buffer size allocation is as per the
driver requirement.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8971>
This commit is contained in:
Pratik Pachange 2025-05-12 18:09:06 +05:30 committed by GStreamer Marge Bot
parent a1a189c07c
commit 8b12aea4c7
1 changed files with 20 additions and 1 deletions
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21
subprojects/gst-plugins-good/sys/v4l2/gstv4l2object.c
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@ -5988,10 +5988,11 @@ gst_v4l2_object_propose_allocation (GstV4l2Object * obj, GstQuery * query)
{
GstBufferPool *pool = NULL;
/* we need at least 2 buffers to operate */
guint size, min, max;
guint size, min, max, aligned_size = 0;
GstCaps *caps;
gboolean need_pool;
GstStructure *allocation_meta = NULL;
GstAllocationParams allocation_params;
/* Set defaults allocation parameters */
size = GST_V4L2_SIZE (obj);
@ -6041,6 +6042,24 @@ gst_v4l2_object_propose_allocation (GstV4l2Object * obj, GstQuery * query)
min = MAX (obj->min_buffers, GST_V4L2_MIN_BUFFERS (obj));
/* If the driver has any size alignment requirements, suggest the difference
* between aligned size and actual size as extra padding to the upstream
* element */
if (V4L2_TYPE_IS_MULTIPLANAR (obj->type)) {
/* FIXME */
} else {
aligned_size = obj->format.fmt.pix.sizeimage;
}
gst_allocation_params_init (&allocation_params);
allocation_params.padding = aligned_size - size;
if (allocation_params.padding) {
gst_query_add_allocation_param (query, NULL, &allocation_params);
/* Update size to aligned size required by driver */
size = aligned_size;
}
gst_query_add_allocation_pool (query, pool, size, min, max);
if (obj->align.padding_top || obj->align.padding_bottom ||