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-rw-r--r--src/libcamera/request.cpp32
1 files changed, 31 insertions, 1 deletions
diff --git a/src/libcamera/request.cpp b/src/libcamera/request.cpp
index 69220247..6c9d67be 100644
--- a/src/libcamera/request.cpp
+++ b/src/libcamera/request.cpp
@@ -14,6 +14,7 @@
#include <libcamera/camera.h>
#include <libcamera/control_ids.h>
+#include <libcamera/fence.h>
#include <libcamera/framebuffer.h>
#include <libcamera/stream.h>
@@ -294,6 +295,7 @@ void Request::reuse(ReuseFlag flags)
* \brief Add a FrameBuffer with its associated Stream to the Request
* \param[in] stream The stream the buffer belongs to
* \param[in] buffer The FrameBuffer to add to the request
+ * \param[in] fence The optional fence
*
* A reference to the buffer is stored in the request. The caller is responsible
* for ensuring that the buffer will remain valid until the request complete
@@ -302,11 +304,27 @@ void Request::reuse(ReuseFlag flags)
* A request can only contain one buffer per stream. If a buffer has already
* been added to the request for the same stream, this function returns -EEXIST.
*
+ * A Fence can be optionally associated with the \a buffer.
+ *
+ * When a valid Fence is provided to this function, \a fence is moved to \a
+ * buffer and this Request will only be queued to the device once the
+ * fences of all its buffers have been correctly signalled.
+ *
+ * If the \a fence associated with \a buffer isn't signalled, the request will
+ * fail after a timeout. The buffer will still contain the fence, which
+ * applications must retrieve with FrameBuffer::releaseFence() before the buffer
+ * can be reused in another request. Attempting to add a buffer that still
+ * contains a fence to a request will result in this function returning -EEXIST.
+ *
+ * \sa FrameBuffer::releaseFence()
+ *
* \return 0 on success or a negative error code otherwise
* \retval -EEXIST The request already contains a buffer for the stream
+ * or the buffer still references a fence
* \retval -EINVAL The buffer does not reference a valid Stream
*/
-int Request::addBuffer(const Stream *stream, FrameBuffer *buffer)
+int Request::addBuffer(const Stream *stream, FrameBuffer *buffer,
+ std::unique_ptr<Fence> fence)
{
if (!stream) {
LOG(Request, Error) << "Invalid stream reference";
@@ -323,6 +341,18 @@ int Request::addBuffer(const Stream *stream, FrameBuffer *buffer)
_d()->pending_.insert(buffer);
bufferMap_[stream] = buffer;
+ /*
+ * Make sure the fence has been extracted from the buffer
+ * to avoid waiting on a stale fence.
+ */
+ if (buffer->_d()->fence()) {
+ LOG(Request, Error) << "Can't add buffer that still references a fence";
+ return -EEXIST;
+ }
+
+ if (fence && fence->isValid())
+ buffer->_d()->setFence(std::move(fence));
+
return 0;
}