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{ "id": 16017, "url": "https://patchwork.libcamera.org/api/1.1/patches/16017/?format=api", "web_url": "https://patchwork.libcamera.org/patch/16017/", "project": { "id": 1, "url": "https://patchwork.libcamera.org/api/1.1/projects/1/?format=api", "name": "libcamera", "link_name": "libcamera", "list_id": "libcamera_core", "list_email": "libcamera-devel@lists.libcamera.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20220524114610.41848-13-tomi.valkeinen@ideasonboard.com>", "date": "2022-05-24T11:46:03", "name": "[libcamera-devel,v2,12/19] py: examples: Add itest.py", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": false, "hash": "53df1ef72bd013b56cfae49d8847e08fe5c32514", "submitter": { "id": 109, "url": "https://patchwork.libcamera.org/api/1.1/people/109/?format=api", "name": "Tomi Valkeinen", "email": "tomi.valkeinen@ideasonboard.com" }, "delegate": null, "mbox": "https://patchwork.libcamera.org/patch/16017/mbox/", "series": [ { "id": 3134, "url": "https://patchwork.libcamera.org/api/1.1/series/3134/?format=api", "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=3134", "date": "2022-05-24T11:45:51", "name": "More misc Python patches", "version": 2, "mbox": "https://patchwork.libcamera.org/series/3134/mbox/" } ], "comments": "https://patchwork.libcamera.org/api/patches/16017/comments/", "check": "pending", "checks": "https://patchwork.libcamera.org/api/patches/16017/checks/", "tags": {}, "headers": { "Return-Path": "<libcamera-devel-bounces@lists.libcamera.org>", "X-Original-To": "parsemail@patchwork.libcamera.org", "Delivered-To": "parsemail@patchwork.libcamera.org", "Received": [ "from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 5B1E7C3272\n\tfor <parsemail@patchwork.libcamera.org>;\n\tTue, 24 May 2022 11:46:51 +0000 (UTC)", "from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 9F85665672;\n\tTue, 24 May 2022 13:46:50 +0200 (CEST)", "from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 490DD65668\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tTue, 24 May 2022 13:46:36 +0200 (CEST)", "from deskari.lan (91-156-85-209.elisa-laajakaista.fi\n\t[91.156.85.209])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id B30194A8;\n\tTue, 24 May 2022 13:46:35 +0200 (CEST)" ], "DKIM-Signature": [ "v=1; 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dkim=pass (1024-bit key; \n\tunprotected) header.d=ideasonboard.com\n\theader.i=@ideasonboard.com\n\theader.b=\"G8Q1EeBL\"; dkim-atps=neutral", "To": "libcamera-devel@lists.libcamera.org,\n\tDavid Plowman <david.plowman@raspberrypi.com>,\n\tKieran Bingham <kieran.bingham@ideasonboard.com>,\n\tLaurent Pinchart <laurent.pinchart@ideasonboard.com>,\n\tJacopo Mondi <jacopo@jmondi.org>", "Date": "Tue, 24 May 2022 14:46:03 +0300", "Message-Id": "<20220524114610.41848-13-tomi.valkeinen@ideasonboard.com>", "X-Mailer": "git-send-email 2.34.1", "In-Reply-To": "<20220524114610.41848-1-tomi.valkeinen@ideasonboard.com>", "References": "<20220524114610.41848-1-tomi.valkeinen@ideasonboard.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Subject": "[libcamera-devel] [PATCH v2 12/19] py: examples: Add itest.py", "X-BeenThere": "libcamera-devel@lists.libcamera.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "<libcamera-devel.lists.libcamera.org>", "List-Unsubscribe": "<https://lists.libcamera.org/options/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=unsubscribe>", "List-Archive": "<https://lists.libcamera.org/pipermail/libcamera-devel/>", "List-Post": "<mailto:libcamera-devel@lists.libcamera.org>", "List-Help": "<mailto:libcamera-devel-request@lists.libcamera.org?subject=help>", "List-Subscribe": "<https://lists.libcamera.org/listinfo/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=subscribe>", "From": "Tomi Valkeinen via libcamera-devel\n\t<libcamera-devel@lists.libcamera.org>", "Reply-To": "Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>", "Errors-To": "libcamera-devel-bounces@lists.libcamera.org", "Sender": "\"libcamera-devel\" <libcamera-devel-bounces@lists.libcamera.org>" }, "content": "Add a small tool which gives the user an IPython based interactive shell\nwith libcamera capturing in the background. Can be used to study and\ntest small things with libcamera.\n\nSigned-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>\n---\n src/py/examples/itest.py | 197 +++++++++++++++++++++++++++++++++++++++\n 1 file changed, 197 insertions(+)\n create mode 100755 src/py/examples/itest.py", "diff": "diff --git a/src/py/examples/itest.py b/src/py/examples/itest.py\nnew file mode 100755\nindex 00000000..01e020e2\n--- /dev/null\n+++ b/src/py/examples/itest.py\n@@ -0,0 +1,197 @@\n+#!/usr/bin/env python3\n+\n+# SPDX-License-Identifier: BSD-3-Clause\n+# Copyright (C) 2022, Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>\n+\n+# This sets up a single camera, starts a capture loop in a background thread,\n+# and starts an IPython shell which can be used to study and test libcamera.\n+#\n+# Note: This is not an example as such, but more of a developer tool to try\n+# out things.\n+\n+import argparse\n+import IPython\n+import libcamera as libcam\n+import selectors\n+import sys\n+import threading\n+\n+\n+def handle_camera_event(ctx):\n+ cm = ctx['cm']\n+ cam = ctx['cam']\n+\n+ # cm.read_event() will not block here, as we know there is an event to read.\n+ # We have to read the event to clear it.\n+\n+ cm.read_event()\n+\n+ reqs = cm.get_ready_requests()\n+\n+ assert len(reqs) > 0\n+\n+ # Process the captured frames\n+\n+ for req in reqs:\n+ buffers = req.buffers\n+\n+ assert len(buffers) == 1\n+\n+ # We want to re-queue the buffer we just handled. Instead of creating\n+ # a new Request, we re-use the old one. We need to call req.reuse()\n+ # to re-initialize the Request before queuing.\n+\n+ req.reuse()\n+ cam.queue_request(req)\n+\n+ scope = ctx['scope']\n+\n+ if 'num_frames' not in scope:\n+ scope['num_frames'] = 0\n+\n+ scope['num_frames'] += 1\n+\n+\n+def capture(ctx):\n+ cm = ctx['cm']\n+ cam = ctx['cam']\n+ reqs = ctx['reqs']\n+\n+ # Queue the requests to the camera\n+\n+ for req in reqs:\n+ ret = cam.queue_request(req)\n+ assert ret == 0\n+\n+ # Use Selector to wait for events from the camera and from the keyboard\n+\n+ sel = selectors.DefaultSelector()\n+ sel.register(cm.efd, selectors.EVENT_READ, lambda fd: handle_camera_event(ctx))\n+\n+ reqs = []\n+\n+ while ctx['running']:\n+ events = sel.select()\n+ for key, mask in events:\n+ key.data(key.fileobj)\n+\n+\n+def main():\n+ parser = argparse.ArgumentParser()\n+ parser.add_argument('-c', '--camera', type=str, default='1',\n+ help='Camera index number (starting from 1) or part of the name')\n+ parser.add_argument('-f', '--format', type=str, help='Pixel format')\n+ parser.add_argument('-s', '--size', type=str, help='Size (\"WxH\")')\n+ args = parser.parse_args()\n+\n+ cm = libcam.CameraManager.singleton()\n+\n+ try:\n+ if args.camera.isnumeric():\n+ cam_idx = int(args.camera)\n+ cam = next((cam for i, cam in enumerate(cm.cameras) if i + 1 == cam_idx))\n+ else:\n+ cam = next((cam for cam in cm.cameras if args.camera in cam.id))\n+ except Exception:\n+ print(f'Failed to find camera \"{args.camera}\"')\n+ return -1\n+\n+ # Acquire the camera for our use\n+\n+ ret = cam.acquire()\n+ assert ret == 0\n+\n+ # Configure the camera\n+\n+ camconfig = cam.generate_configuration([libcam.StreamRole.StillCapture])\n+\n+ streamconfig = camconfig.at(0)\n+\n+ if args.format:\n+ fmt = libcam.PixelFormat(args.format)\n+ streamconfig.pixel_format = fmt\n+\n+ if args.size:\n+ w, h = [int(v) for v in args.size.split('x')]\n+ streamconfig.size = libcam.Size(w, h)\n+\n+ ret = cam.configure(camconfig)\n+ assert ret == 0\n+\n+ stream = streamconfig.stream\n+\n+ # Allocate the buffers for capture\n+\n+ allocator = libcam.FrameBufferAllocator(cam)\n+ ret = allocator.allocate(stream)\n+ assert ret > 0\n+\n+ num_bufs = len(allocator.buffers(stream))\n+\n+ print(f'Capturing {streamconfig} with {num_bufs} buffers from {cam.id}')\n+\n+ # Create the requests and assign a buffer for each request\n+\n+ reqs = []\n+ for i in range(num_bufs):\n+ # Use the buffer index as the \"cookie\"\n+ req = cam.create_request(i)\n+\n+ buffer = allocator.buffers(stream)[i]\n+ ret = req.add_buffer(stream, buffer)\n+ assert ret == 0\n+\n+ reqs.append(req)\n+\n+ # Start the camera\n+\n+ ret = cam.start()\n+ assert ret == 0\n+\n+ # Create a scope for the IPython shell\n+ scope = {\n+ 'cm': cm,\n+ 'cam': cam,\n+ 'libcam': libcam,\n+ }\n+\n+ # Create a simple context shared between the background thread and the main\n+ # thread.\n+ ctx = {\n+ 'running': True,\n+ 'cm': cm,\n+ 'cam': cam,\n+ 'reqs': reqs,\n+ 'scope': scope,\n+ }\n+\n+ # Note that \"In CPython, due to the Global Interpreter Lock, only one thread\n+ # can execute Python code at once\". We rely on that here, which is not very\n+ # nice. I am sure an fd-based polling loop could be integrated with IPython,\n+ # somehow, which would allow us to drop the threading.\n+\n+ t = threading.Thread(target=capture, args=(ctx,))\n+ t.start()\n+\n+ IPython.embed(banner1=\"\", exit_msg=\"\", confirm_exit=False, user_ns=scope)\n+\n+ print(\"Exiting...\")\n+\n+ ctx[\"running\"] = False\n+ t.join()\n+\n+ # Stop the camera\n+\n+ ret = cam.stop()\n+ assert ret == 0\n+\n+ # Release the camera\n+\n+ ret = cam.release()\n+ assert ret == 0\n+\n+ return 0\n+\n+\n+if __name__ == '__main__':\n+ sys.exit(main())\n", "prefixes": [ "libcamera-devel", "v2", "12/19" ] }