py: Implement FrameBufferPlane

Implement FrameBufferPlane class and adjust the methods and uses
accordingly.

Note that we don't expose the fd as a SharedFD, but as an int.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/py/cam/cam_kms.py

@@ -131,10 +131,10 @@ class KMSRenderer:
                     fds = []
                     strides = []
                     offsets = []
-                    for i in range(fb.num_planes):
-                        fds.append(fb.fd(i))
+                    for plane in fb.planes:
+                        fds.append(plane.fd)
                         strides.append(cfg.stride)
-                        offsets.append(fb.offset(i))
+                        offsets.append(plane.offset)
 
                     drmfb = pykms.DmabufFramebuffer(self.card, w, h, fmt,
                                                     fds, strides, offsets)

src/py/cam/cam_qtgl.py

@@ -269,7 +269,7 @@ class MainWindow(QtWidgets.QWidget):
             EGL_WIDTH, w,
             EGL_HEIGHT, h,
             EGL_LINUX_DRM_FOURCC_EXT, fmt,
-            EGL_DMA_BUF_PLANE0_FD_EXT, fb.fd(0),
+            EGL_DMA_BUF_PLANE0_FD_EXT, fb.planes[0].fd,
             EGL_DMA_BUF_PLANE0_OFFSET_EXT, 0,
             EGL_DMA_BUF_PLANE0_PITCH_EXT, cfg.stride,
             EGL_NONE,

src/py/libcamera/py_main.cpp

@@ -155,6 +155,7 @@ PYBIND11_MODULE(_libcamera, m)
 	auto pyStreamFormats = py::class_<StreamFormats>(m, "StreamFormats");
 	auto pyFrameBufferAllocator = py::class_<FrameBufferAllocator>(m, "FrameBufferAllocator");
 	auto pyFrameBuffer = py::class_<FrameBuffer>(m, "FrameBuffer");
+	auto pyFrameBufferPlane = py::class_<FrameBuffer::Plane>(pyFrameBuffer, "Plane");
 	auto pyStream = py::class_<Stream>(m, "Stream");
 	auto pyControlId = py::class_<ControlId>(m, "ControlId");
 	auto pyControlInfo = py::class_<ControlInfo>(m, "ControlInfo");
@@ -408,31 +409,31 @@ PYBIND11_MODULE(_libcamera, m)
 		});
 
 	pyFrameBuffer
-		/* \todo implement FrameBuffer::Plane properly */
-		.def(py::init([](std::vector<std::tuple<int, unsigned int>> planes, unsigned int cookie) {
-			std::vector<FrameBuffer::Plane> v;
-			for (const auto &t : planes)
-				v.push_back({ SharedFD(std::get<0>(t)), FrameBuffer::Plane::kInvalidOffset, std::get<1>(t) });
-			return new FrameBuffer(v, cookie);
-		}))
+		.def(py::init<std::vector<FrameBuffer::Plane>, unsigned int>(),
+		     py::arg("planes"), py::arg("cookie") = 0)
 		.def_property_readonly("metadata", &FrameBuffer::metadata, py::return_value_policy::reference_internal)
-		.def_property_readonly("num_planes", [](const FrameBuffer &self) {
-			return self.planes().size();
-		})
-		.def("length", [](FrameBuffer &self, uint32_t idx) {
-			const FrameBuffer::Plane &plane = self.planes()[idx];
-			return plane.length;
-		})
-		.def("fd", [](FrameBuffer &self, uint32_t idx) {
-			const FrameBuffer::Plane &plane = self.planes()[idx];
-			return plane.fd.get();
-		})
-		.def("offset", [](FrameBuffer &self, uint32_t idx) {
-			const FrameBuffer::Plane &plane = self.planes()[idx];
-			return plane.offset;
-		})
+		.def_property_readonly("planes", &FrameBuffer::planes)
 		.def_property("cookie", &FrameBuffer::cookie, &FrameBuffer::setCookie);
 
+	pyFrameBufferPlane
+		.def(py::init())
+		.def(py::init([](int fd, unsigned int offset, unsigned int length) {
+			auto p = FrameBuffer::Plane();
+			p.fd = SharedFD(fd);
+			p.offset = offset;
+			p.length = length;
+			return p;
+		}), py::arg("fd"), py::arg("offset"), py::arg("length"))
+		.def_property("fd",
+			[](const FrameBuffer::Plane &self) {
+				return self.fd.get();
+			},
+			[](FrameBuffer::Plane &self, int fd) {
+				self.fd = SharedFD(fd);
+			})
+		.def_readwrite("offset", &FrameBuffer::Plane::offset)
+		.def_readwrite("length", &FrameBuffer::Plane::length);
+
 	pyStream
 		.def_property_readonly("configuration", &Stream::configuration);
 

src/py/libcamera/utils/MappedFrameBuffer.py

@@ -21,8 +21,8 @@ class MappedFrameBuffer:
 
         bufinfos = {}
 
-        for i in range(fb.num_planes):
-            fd = fb.fd(i)
+        for plane in fb.planes:
+            fd = plane.fd
 
             if fd not in bufinfos:
                 buflen = os.lseek(fd, 0, os.SEEK_END)
@@ -30,11 +30,11 @@ class MappedFrameBuffer:
             else:
                 buflen = bufinfos[fd]['buflen']
 
-            if fb.offset(i) > buflen or fb.offset(i) + fb.length(i) > buflen:
+            if plane.offset > buflen or plane.offset + plane.length > buflen:
                 raise RuntimeError(f'plane is out of buffer: buffer length={buflen}, ' +
-                                   f'plane offset={fb.offset(i)}, plane length={fb.length(i)}')
+                                   f'plane offset={plane.offset}, plane length={plane.length}')
 
-            bufinfos[fd]['maplen'] = max(bufinfos[fd]['maplen'], fb.offset(i) + fb.length(i))
+            bufinfos[fd]['maplen'] = max(bufinfos[fd]['maplen'], plane.offset + plane.length)
 
         # mmap the buffers
 
@@ -51,14 +51,14 @@ class MappedFrameBuffer:
 
         planes = []
 
-        for i in range(fb.num_planes):
-            fd = fb.fd(i)
+        for plane in fb.planes:
+            fd = plane.fd
             info = bufinfos[fd]
 
             mv = memoryview(info['map'])
 
-            start = fb.offset(i)
-            end = fb.offset(i) + fb.length(i)
+            start = plane.offset
+            end = plane.offset + plane.length
 
             mv = mv[start:end]