path: root/src/libcamera
diff options
authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2021-08-30 01:59:27 +0300
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2022-08-03 17:44:34 +0300
commitbd25118dec87c2ad5a3463ec89df327255ab9422 (patch)
tree542277d09f18b6c7b52fb21fd1c99e3126798331 /src/libcamera
parentfe9c22c8b1c0cf41e0c77e20085f0cf81f174cdf (diff)
libcamera: pipeline: simple: Setup links in the context of sink entities
To setup links the pipeline handler iterates over all entities in the pipeline and disables all links but the ones we want to enable. Some entities don't allow multiple sink links to be enabled, so the iteration needs to be based on sink entities, disabling all their links first and then enabling the sink link that is part of the pipeline. The loop implementation iterates over all Entity instances, and uses their source link to locate the MediaEntity for the connected sink. The sink entity is then processed in the context of the source's loop iteration. This prevents the code from being able to access extra information about the sink entity, as we only have access to the MediaEntity, not the Entity. To prepare for subdev routing support that will require accessing additional entity information, refactor the loop to process the sink entity in the context of its Entity instance. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Tested-by: Jacopo Mondi <jacopo@jmondi.org>
Diffstat (limited to 'src/libcamera')
1 files changed, 17 insertions, 7 deletions
diff --git a/src/libcamera/pipeline/simple/simple.cpp b/src/libcamera/pipeline/simple/simple.cpp
index c5828b6b..3ca7fdff 100644
--- a/src/libcamera/pipeline/simple/simple.cpp
+++ b/src/libcamera/pipeline/simple/simple.cpp
@@ -578,15 +578,23 @@ int SimpleCameraData::setupLinks()
* multiple sink links to be enabled together, even on different sink
* pads. We must thus start by disabling all sink links (but the one we
* want to enable) before enabling the pipeline link.
+ *
+ * The entities_ list stores entities along with their source link. We
+ * need to process the link in the context of the sink entity, so
+ * record the source link of the current entity as the sink link of the
+ * next entity, and skip the first entity in the loop.
+ MediaLink *sinkLink = nullptr;
for (SimpleCameraData::Entity &e : entities_) {
- if (!e.sourceLink)
- break;
+ if (!sinkLink) {
+ sinkLink = e.sourceLink;
+ continue;
+ }
- MediaEntity *remote = e.sourceLink->sink()->entity();
- for (MediaPad *pad : remote->pads()) {
+ for (MediaPad *pad : e.entity->pads()) {
for (MediaLink *link : pad->links()) {
- if (link == e.sourceLink)
+ if (link == sinkLink)
if ((link->flags() & MEDIA_LNK_FL_ENABLED) &&
@@ -598,11 +606,13 @@ int SimpleCameraData::setupLinks()
- if (!(e.sourceLink->flags() & MEDIA_LNK_FL_ENABLED)) {
- ret = e.sourceLink->setEnabled(true);
+ if (!(sinkLink->flags() & MEDIA_LNK_FL_ENABLED)) {
+ ret = sinkLink->setEnabled(true);
if (ret < 0)
return ret;
+ sinkLink = e.sourceLink;
return 0;

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