libcamera: buffer: Switch from Plane to FrameBuffer::Plane

It is not libcamera's responsibility to handle memory mappings. Switch
from the soon to be removed Plane class which deals with memory
mappings to FrameBuffer::Plane which just describes it. This makes the
transition to the full FrameBuffer easier.

As the full FrameBuffer interface has not yet spread to all parts of
libcamera core it is hard to create efficient caching of memory mappings
in the qcam application. This will be fixed in a later patch, for now
the dmabuf is mapped and unmapped each time it is seen by the
application.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

4 files changed, 15 insertions, 20 deletions

diff --git a/src/libcamera/buffer.cpp b/src/libcamera/buffer.cpp
index 2178bd2f..ec7c614d 100644
--- a/src/libcamera/buffer.cpp
+++ b/src/libcamera/buffer.cpp
@@ -257,13 +257,13 @@ void *Plane::mem()
 /**
  * \fn BufferMemory::planes() const
  * \brief Retrieve the planes within the buffer
- * \return A const reference to a vector holding all Planes within the buffer
+ * \return A const reference to a vector holding all planes within the buffer
  */
 
 /**
  * \fn BufferMemory::planes()
  * \brief Retrieve the planes within the buffer
- * \return A reference to a vector holding all Planes within the buffer
+ * \return A reference to a vector holding all planes within the buffer
  */
 
 /**
diff --git a/src/libcamera/pipeline/rkisp1/rkisp1.cpp b/src/libcamera/pipeline/rkisp1/rkisp1.cpp
index d7ee95de..1e445715 100644
--- a/src/libcamera/pipeline/rkisp1/rkisp1.cpp
+++ b/src/libcamera/pipeline/rkisp1/rkisp1.cpp
@@ -687,22 +687,14 @@ int PipelineHandlerRkISP1::allocateBuffers(Camera *camera,
 	}
 
 	for (unsigned int i = 0; i < stream->configuration().bufferCount + 1; i++) {
-		FrameBuffer::Plane plane;
-		plane.fd = FileDescriptor(paramPool_.buffers()[i].planes()[0].dmabuf());
-		plane.length = paramPool_.buffers()[i].planes()[0].length();
-
 		data->ipaBuffers_.push_back({ .id = RKISP1_PARAM_BASE | i,
-					      .planes = { plane } });
+					      .planes = paramPool_.buffers()[i].planes() });
 		paramBuffers_.push(new Buffer(i));
 	}
 
 	for (unsigned int i = 0; i < stream->configuration().bufferCount + 1; i++) {
-		FrameBuffer::Plane plane;
-		plane.fd = FileDescriptor(statPool_.buffers()[i].planes()[0].dmabuf());
-		plane.length = statPool_.buffers()[i].planes()[0].length();
-
 		data->ipaBuffers_.push_back({ .id = RKISP1_STAT_BASE | i,
-					      .planes = { plane } });
+					      .planes = statPool_.buffers()[i].planes() });
 		statBuffers_.push(new Buffer(i));
 	}
 
diff --git a/src/libcamera/stream.cpp b/src/libcamera/stream.cpp
index 45f31ae1..16a323f1 100644
--- a/src/libcamera/stream.cpp
+++ b/src/libcamera/stream.cpp
@@ -577,8 +577,10 @@ int Stream::mapBuffer(const Buffer *buffer)
 		if (dmabufs[i] == -1)
 			break;
 
-		mem->planes().emplace_back();
-		mem->planes().back().setDmabuf(dmabufs[i], 0);
+		FrameBuffer::Plane plane;
+		plane.fd = FileDescriptor(dmabufs[i]);
+		plane.length = 0;
+		mem->planes().push_back(plane);
 	}
 
 	/* Remove the buffer from the cache and return its index. */
diff --git a/src/libcamera/v4l2_videodevice.cpp b/src/libcamera/v4l2_videodevice.cpp
index 033f7cc0..1dc9e193 100644
--- a/src/libcamera/v4l2_videodevice.cpp
+++ b/src/libcamera/v4l2_videodevice.cpp
@@ -922,9 +922,10 @@ int V4L2VideoDevice::createPlane(BufferMemory *buffer, unsigned int index,
 		return ret;
 	}
 
-	buffer->planes().emplace_back();
-	Plane &plane = buffer->planes().back();
-	plane.setDmabuf(expbuf.fd, length);
+	FrameBuffer::Plane plane;
+	plane.fd = FileDescriptor(expbuf.fd);
+	plane.length = length;
+	buffer->planes().push_back(plane);
 	::close(expbuf.fd);
 
 	return 0;
@@ -987,14 +988,14 @@ int V4L2VideoDevice::queueBuffer(Buffer *buffer)
 
 	bool multiPlanar = V4L2_TYPE_IS_MULTIPLANAR(buf.type);
 	BufferMemory *mem = &bufferPool_->buffers()[buf.index];
-	const std::vector<Plane> &planes = mem->planes();
+	const std::vector<FrameBuffer::Plane> &planes = mem->planes();
 
 	if (buf.memory == V4L2_MEMORY_DMABUF) {
 		if (multiPlanar) {
 			for (unsigned int p = 0; p < planes.size(); ++p)
-				v4l2Planes[p].m.fd = planes[p].dmabuf();
+				v4l2Planes[p].m.fd = planes[p].fd.fd();
 		} else {
-			buf.m.fd = planes[0].dmabuf();
+			buf.m.fd = planes[0].fd.fd();
 		}
 	}