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authorTomi Valkeinen <tomi.valkeinen@ideasonboard.com>2023-05-30 15:01:31 +0300
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2023-05-30 18:29:09 +0300
commit1fb31ac4f4c3e436aa3e8a647b5a4b912f0f45a3 (patch)
treef37214bf108a0b8d8548badf1eed12a15c5e55eb /src
parent5b2f1ce5012fcb5af22ef3a97985bac11d9c4077 (diff)
py: Use exceptions instead of returning error codes
We have multiple methods which return an error code, mimicking the C++ API. Using exceptions is more natural in the Python API, so change all those methods to raise an Exception instead. Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Diffstat (limited to 'src')
-rwxr-xr-xsrc/py/cam/cam.py16
-rwxr-xr-xsrc/py/examples/simple-cam.py15
-rwxr-xr-xsrc/py/examples/simple-capture.py21
-rwxr-xr-xsrc/py/examples/simple-continuous-capture.py21
-rw-r--r--src/py/libcamera/py_main.cpp60
5 files changed, 64 insertions, 69 deletions
diff --git a/src/py/cam/cam.py b/src/py/cam/cam.py
index 967a72f5..a2a115c1 100755
--- a/src/py/cam/cam.py
+++ b/src/py/cam/cam.py
@@ -158,9 +158,7 @@ class CameraContext:
print('Camera configuration adjusted')
- r = self.camera.configure(camconfig)
- if r != 0:
- raise Exception('Configure failed')
+ self.camera.configure(camconfig)
self.stream_names = {}
self.streams = []
@@ -175,12 +173,7 @@ class CameraContext:
allocator = libcam.FrameBufferAllocator(self.camera)
for stream in self.streams:
- ret = allocator.allocate(stream)
- if ret < 0:
- print('Cannot allocate buffers')
- exit(-1)
-
- allocated = len(allocator.buffers(stream))
+ allocated = allocator.allocate(stream)
print('{}-{}: Allocated {} buffers'.format(self.id, self.stream_names[stream], allocated))
@@ -205,10 +198,7 @@ class CameraContext:
buffers = self.allocator.buffers(stream)
buffer = buffers[buf_num]
- ret = request.add_buffer(stream, buffer)
- if ret < 0:
- print('Can not set buffer for request')
- exit(-1)
+ request.add_buffer(stream, buffer)
requests.append(request)
diff --git a/src/py/examples/simple-cam.py b/src/py/examples/simple-cam.py
index b3e97ca7..1cd1019d 100755
--- a/src/py/examples/simple-cam.py
+++ b/src/py/examples/simple-cam.py
@@ -259,12 +259,7 @@ def main():
allocator = libcam.FrameBufferAllocator(camera)
for cfg in config:
- ret = allocator.allocate(cfg.stream)
- if ret < 0:
- print('Can\'t allocate buffers')
- return -1
-
- allocated = len(allocator.buffers(cfg.stream))
+ allocated = allocator.allocate(cfg.stream)
print(f'Allocated {allocated} buffers for stream')
# --------------------------------------------------------------------
@@ -289,15 +284,9 @@ def main():
requests = []
for i in range(len(buffers)):
request = camera.create_request()
- if not request:
- print('Can\'t create request')
- return -1
buffer = buffers[i]
- ret = request.add_buffer(stream, buffer)
- if ret < 0:
- print('Can\'t set buffer for request')
- return -1
+ request.add_buffer(stream, buffer)
# Controls can be added to a request on a per frame basis.
request.set_control(libcam.controls.Brightness, 0.5)
diff --git a/src/py/examples/simple-capture.py b/src/py/examples/simple-capture.py
index 5f93574f..4b85408f 100755
--- a/src/py/examples/simple-capture.py
+++ b/src/py/examples/simple-capture.py
@@ -43,8 +43,7 @@ def main():
# Acquire the camera for our use
- ret = cam.acquire()
- assert ret == 0
+ cam.acquire()
# Configure the camera
@@ -60,8 +59,7 @@ def main():
w, h = [int(v) for v in args.size.split('x')]
stream_config.size = libcam.Size(w, h)
- ret = cam.configure(cam_config)
- assert ret == 0
+ cam.configure(cam_config)
print(f'Capturing {TOTAL_FRAMES} frames with {stream_config}')
@@ -83,15 +81,13 @@ def main():
req = cam.create_request(i)
buffer = allocator.buffers(stream)[i]
- ret = req.add_buffer(stream, buffer)
- assert ret == 0
+ req.add_buffer(stream, buffer)
reqs.append(req)
# Start the camera
- ret = cam.start()
- assert ret == 0
+ cam.start()
# frames_queued and frames_done track the number of frames queued and done
@@ -101,8 +97,7 @@ def main():
# Queue the requests to the camera
for req in reqs:
- ret = cam.queue_request(req)
- assert ret == 0
+ cam.queue_request(req)
frames_queued += 1
# The main loop. Wait for the queued Requests to complete, process them,
@@ -155,13 +150,11 @@ def main():
# Stop the camera
- ret = cam.stop()
- assert ret == 0
+ cam.stop()
# Release the camera
- ret = cam.release()
- assert ret == 0
+ cam.release()
return 0
diff --git a/src/py/examples/simple-continuous-capture.py b/src/py/examples/simple-continuous-capture.py
index 26a8060b..e1cb931e 100755
--- a/src/py/examples/simple-continuous-capture.py
+++ b/src/py/examples/simple-continuous-capture.py
@@ -28,8 +28,7 @@ class CameraCaptureContext:
# Acquire the camera for our use
- ret = cam.acquire()
- assert ret == 0
+ cam.acquire()
# Configure the camera
@@ -37,8 +36,7 @@ class CameraCaptureContext:
stream_config = cam_config.at(0)
- ret = cam.configure(cam_config)
- assert ret == 0
+ cam.configure(cam_config)
stream = stream_config.stream
@@ -62,8 +60,7 @@ class CameraCaptureContext:
req = cam.create_request(idx)
buffer = allocator.buffers(stream)[i]
- ret = req.add_buffer(stream, buffer)
- assert ret == 0
+ req.add_buffer(stream, buffer)
self.reqs.append(req)
@@ -73,13 +70,11 @@ class CameraCaptureContext:
def uninit_camera(self):
# Stop the camera
- ret = self.cam.stop()
- assert ret == 0
+ self.cam.stop()
# Release the camera
- ret = self.cam.release()
- assert ret == 0
+ self.cam.release()
# A container class for our state
@@ -145,8 +140,7 @@ class CaptureContext:
for cam_ctx in self.camera_contexts:
for req in cam_ctx.reqs:
- ret = cam_ctx.cam.queue_request(req)
- assert ret == 0
+ cam_ctx.cam.queue_request(req)
# Use Selector to wait for events from the camera and from the keyboard
@@ -177,8 +171,7 @@ def main():
# Start the cameras
for cam_ctx in ctx.camera_contexts:
- ret = cam_ctx.cam.start()
- assert ret == 0
+ cam_ctx.cam.start()
ctx.capture()
diff --git a/src/py/libcamera/py_main.cpp b/src/py/libcamera/py_main.cpp
index 56d0717e..c66b90cd 100644
--- a/src/py/libcamera/py_main.cpp
+++ b/src/py/libcamera/py_main.cpp
@@ -112,8 +112,18 @@ PYBIND11_MODULE(_libcamera, m)
pyCamera
.def_property_readonly("id", &Camera::id)
- .def("acquire", &Camera::acquire)
- .def("release", &Camera::release)
+ .def("acquire", [](Camera &self) {
+ int ret = self.acquire();
+ if (ret)
+ throw std::system_error(-ret, std::generic_category(),
+ "Failed to acquire camera");
+ })
+ .def("release", [](Camera &self) {
+ int ret = self.release();
+ if (ret)
+ throw std::system_error(-ret, std::generic_category(),
+ "Failed to release camera");
+ })
.def("start", [](Camera &self,
const std::unordered_map<const ControlId *, py::object> &controls) {
/* \todo What happens if someone calls start() multiple times? */
@@ -133,20 +143,19 @@ PYBIND11_MODULE(_libcamera, m)
int ret = self.start(&controlList);
if (ret) {
self.requestCompleted.disconnect();
- return ret;
+ throw std::system_error(-ret, std::generic_category(),
+ "Failed to start camera");
}
-
- return 0;
}, py::arg("controls") = std::unordered_map<const ControlId *, py::object>())
.def("stop", [](Camera &self) {
int ret = self.stop();
- if (ret)
- return ret;
self.requestCompleted.disconnect();
- return 0;
+ if (ret)
+ throw std::system_error(-ret, std::generic_category(),
+ "Failed to stop camera");
})
.def("__str__", [](Camera &self) {
@@ -155,9 +164,20 @@ PYBIND11_MODULE(_libcamera, m)
/* Keep the camera alive, as StreamConfiguration contains a Stream* */
.def("generate_configuration", &Camera::generateConfiguration, py::keep_alive<0, 1>())
- .def("configure", &Camera::configure)
+ .def("configure", [](Camera &self, CameraConfiguration *config) {
+ int ret = self.configure(config);
+ if (ret)
+ throw std::system_error(-ret, std::generic_category(),
+ "Failed to configure camera");
+ })
- .def("create_request", &Camera::createRequest, py::arg("cookie") = 0)
+ .def("create_request", [](Camera &self, uint64_t cookie) {
+ std::unique_ptr<Request> req = self.createRequest(cookie);
+ if (!req)
+ throw std::system_error(ENOMEM, std::generic_category(),
+ "Failed to create request");
+ return req;
+ }, py::arg("cookie") = 0)
.def("queue_request", [](Camera &self, Request *req) {
py::object py_req = py::cast(req);
@@ -170,10 +190,11 @@ PYBIND11_MODULE(_libcamera, m)
py_req.inc_ref();
int ret = self.queueRequest(req);
- if (ret)
+ if (ret) {
py_req.dec_ref();
-
- return ret;
+ throw std::system_error(-ret, std::generic_category(),
+ "Failed to queue request");
+ }
})
.def_property_readonly("streams", [](Camera &self) {
@@ -251,7 +272,13 @@ PYBIND11_MODULE(_libcamera, m)
pyFrameBufferAllocator
.def(py::init<std::shared_ptr<Camera>>(), py::keep_alive<1, 2>())
- .def("allocate", &FrameBufferAllocator::allocate)
+ .def("allocate", [](FrameBufferAllocator &self, Stream *stream) {
+ int ret = self.allocate(stream);
+ if (ret < 0)
+ throw std::system_error(-ret, std::generic_category(),
+ "Failed to allocate buffers");
+ return ret;
+ })
.def_property_readonly("allocated", &FrameBufferAllocator::allocated)
/* Create a list of FrameBuffers, where each FrameBuffer has a keep-alive to FrameBufferAllocator */
.def("buffers", [](FrameBufferAllocator &self, Stream *stream) {
@@ -328,7 +355,10 @@ PYBIND11_MODULE(_libcamera, m)
pyRequest
/* \todo Fence is not supported, so we cannot expose addBuffer() directly */
.def("add_buffer", [](Request &self, const Stream *stream, FrameBuffer *buffer) {
- return self.addBuffer(stream, buffer);
+ int ret = self.addBuffer(stream, buffer);
+ if (ret)
+ throw std::system_error(-ret, std::generic_category(),
+ "Failed to add buffer");
}, py::keep_alive<1, 3>()) /* Request keeps Framebuffer alive */
.def_property_readonly("status", &Request::status)
.def_property_readonly("buffers", &Request::buffers)