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gstreamer: Reduce indentation in gst_libcamera_create_video_pool()

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Now that video pool creation is handled by a dedicated function, the
logic can be simplified by returning early instead of nesting scopes. Do
so to decrease indentation and improve readability, and document the
implementation of the function with comments.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
This commit is contained in:
Laurent Pinchart 2025-05-22 11:47:29 +02:00
parent 3b68207789
commit 613202b809
1 changed files with 30 additions and 27 deletions
Download patch file Download diff file Expand all files Collapse all files

57
src/gstreamer/gstlibcamerasrc.cpp
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@ -542,45 +542,48 @@ gst_libcamera_create_video_pool(GstLibcameraSrc *self, GstPad *srcpad,
{
GstQuery *query = NULL;
const gboolean need_pool = true;
gboolean has_video_meta = false;
GstBufferPool *video_pool = NULL;
/*
* Get the peer allocation hints to check if it supports the meta API.
* If so, the stride will be negotiated, and there's no need to create a
* video pool.
*/
query = gst_query_new_allocation(caps, need_pool);
if (!gst_pad_peer_query(srcpad, query))
GST_DEBUG_OBJECT(self, "Didn't get downstream ALLOCATION hints");
else
has_video_meta = gst_query_find_allocation_meta(query, GST_VIDEO_META_API_TYPE, NULL);
else if (gst_query_find_allocation_meta(query, GST_VIDEO_META_API_TYPE, NULL))
return { NULL, 0 };
if (!has_video_meta) {
GstBufferPool *pool = NULL;
GST_WARNING_OBJECT(self, "Downstream doesn't support video meta, need to copy frame.");
if (gst_query_get_n_allocation_pools(query) > 0)
gst_query_parse_nth_allocation_pool(query, 0, &pool, NULL, NULL, NULL);
/*
* If the allocation query has pools, use the first one. Otherwise,
* create a new pool.
*/
if (gst_query_get_n_allocation_pools(query) > 0)
gst_query_parse_nth_allocation_pool(query, 0, &video_pool, NULL, NULL, NULL);
if (pool)
video_pool = pool;
else {
GstStructure *config;
guint min_buffers = 3;
video_pool = gst_video_buffer_pool_new();
if (!video_pool) {
GstStructure *config;
guint min_buffers = 3;
config = gst_buffer_pool_get_config(video_pool);
gst_buffer_pool_config_set_params(config, caps, info->size, min_buffers, 0);
video_pool = gst_video_buffer_pool_new();
config = gst_buffer_pool_get_config(video_pool);
gst_buffer_pool_config_set_params(config, caps, info->size, min_buffers, 0);
GST_DEBUG_OBJECT(self, "Own pool config is %" GST_PTR_FORMAT, config);
GST_DEBUG_OBJECT(self, "Own pool config is %" GST_PTR_FORMAT, config);
gst_buffer_pool_set_config(GST_BUFFER_POOL_CAST(video_pool), config);
}
gst_buffer_pool_set_config(GST_BUFFER_POOL_CAST(video_pool), config);
}
GST_WARNING_OBJECT(self, "Downstream doesn't support video meta, need to copy frame.");
if (!gst_buffer_pool_set_active(video_pool, true)) {
gst_caps_unref(caps);
GST_ELEMENT_ERROR(self, RESOURCE, SETTINGS,
("Failed to active buffer pool"),
("gst_libcamera_src_negotiate() failed."));
return { NULL, -EINVAL };
}
if (!gst_buffer_pool_set_active(video_pool, true)) {
gst_caps_unref(caps);
GST_ELEMENT_ERROR(self, RESOURCE, SETTINGS,
("Failed to active buffer pool"),
("gst_libcamera_src_negotiate() failed."));
return { NULL, -EINVAL };
}
gst_query_unref(query);