{"id":16018,"url":"https://patchwork.libcamera.org/api/patches/16018/?format=json","web_url":"https://patchwork.libcamera.org/patch/16018/","project":{"id":1,"url":"https://patchwork.libcamera.org/api/projects/1/?format=json","name":"libcamera","link_name":"libcamera","list_id":"libcamera_core","list_email":"libcamera-devel@lists.libcamera.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20220524114610.41848-12-tomi.valkeinen@ideasonboard.com>","date":"2022-05-24T11:46:02","name":"[libcamera-devel,v2,11/19] py: examples: Add simple-continuous-capture.py","commit_ref":null,"pull_url":null,"state":"superseded","archived":false,"hash":"0d7560c8e383634b84db5fe0fb1294adab2647f1","submitter":{"id":109,"url":"https://patchwork.libcamera.org/api/people/109/?format=json","name":"Tomi Valkeinen","email":"tomi.valkeinen@ideasonboard.com"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/16018/mbox/","series":[{"id":3134,"url":"https://patchwork.libcamera.org/api/series/3134/?format=json","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/16018/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/16018/checks/","tags":{},"headers":{"Return-Path":"","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 AE6E3C3273\n\tfor ;\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 1D60C6566F;\n\tTue, 24 May 2022 13:46:51 +0200 (CEST)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id C4E8760422\n\tfor ;\n\tTue, 24 May 2022 13:46:35 +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 33CF78DC;\n\tTue, 24 May 2022 13:46:35 +0200 (CEST)"],"DKIM-Signature":["v=1; a=rsa-sha256; c=relaxed/simple; d=libcamera.org;\n\ts=mail; t=1653392811;\n\tbh=Zoo4eYDvJTk4uOcxTOPJMxZiJpWy8yZgBMPCKB9S/PE=;\n\th=To:Date:In-Reply-To:References:Subject:List-Id:List-Unsubscribe:\n\tList-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:\n\tFrom;\n\tb=DjhZg++gWR7OFQktRleQnVPQIHFqVawnc3/H5LunufM/U83zWmUp7NfW6mbqg7VOq\n\tEJekgtxKP7mBl+7gV5uJlVA20aoVw6w7ffRPmGlUhegyTi8+iW8wI69C3yccFANGyF\n\t0dpSvlcHI2m75gbvqGyc1ZjgdsheXYM0YgyIN8bnlsJ3wYVWRjC/P8hsk+ot5P/7x7\n\tCMCjcmC41IJ7cW8VGtc+IxqSWP8bOoem3OGbJS+E1vez3RWlvBsLVSVCEl2oV8+ohR\n\tciY9Ytpfz7EfizvGqHyqsLSky3ywzPvVni9X8vHPb5/7mUxp8I8SbHmXocnrgCryfK\n\tHH7VsFjSWmbFw==","v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1653392795;\n\tbh=Zoo4eYDvJTk4uOcxTOPJMxZiJpWy8yZgBMPCKB9S/PE=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=tJtEyB7mBoPwYSaxw8FURqf0v6Wuh5QhalDy48UXzYdXuqRIab78KsZSNwL0CdSKL\n\tRmRzLdjf7pnchU6DycptHT4PGmximM2iz9MHf9i6Q9+cH5Wf5YRUUYY2M1kmQnWAU7\n\tsod2vTaxeCv1CVL7dkWNcsnkfavoYWaiJYMOdXA8="],"Authentication-Results":"lancelot.ideasonboard.com; dkim=pass (1024-bit key; \n\tunprotected) header.d=ideasonboard.com\n\theader.i=@ideasonboard.com\n\theader.b=\"tJtEyB7m\"; dkim-atps=neutral","To":"libcamera-devel@lists.libcamera.org,\n\tDavid Plowman ,\n\tKieran Bingham ,\n\tLaurent Pinchart ,\n\tJacopo Mondi ","Date":"Tue, 24 May 2022 14:46:02 +0300","Message-Id":"<20220524114610.41848-12-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 11/19] py: examples: Add\n\tsimple-continuous-capture.py","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","From":"Tomi Valkeinen via libcamera-devel\n\t","Reply-To":"Tomi Valkeinen ","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "},"content":"Add a slightly more complex, and I think a more realistic, example,\nwhere the script reacts to events and re-queues the buffers.\n\nSigned-off-by: Tomi Valkeinen \n---\n src/py/examples/simple-continuous-capture.py | 179 +++++++++++++++++++\n 1 file changed, 179 insertions(+)\n create mode 100755 src/py/examples/simple-continuous-capture.py","diff":"diff --git a/src/py/examples/simple-continuous-capture.py b/src/py/examples/simple-continuous-capture.py\nnew file mode 100755\nindex 00000000..05fa2ada\n--- /dev/null\n+++ b/src/py/examples/simple-continuous-capture.py\n@@ -0,0 +1,179 @@\n+#!/usr/bin/env python3\n+\n+# SPDX-License-Identifier: BSD-3-Clause\n+# Copyright (C) 2022, Tomi Valkeinen \n+\n+# A simple minimal capture example showing:\n+# - How to setup the camera\n+# - Capture frames using events\n+# - How to requeue requests\n+# - Memory map the frames\n+# - How to stop the camera\n+\n+import argparse\n+import binascii\n+import libcamera as libcam\n+import libcamera.utils\n+import selectors\n+import sys\n+\n+\n+def handle_camera_event(cm, cam):\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+ # Process the captured frames\n+\n+ for req in reqs:\n+ buffers = req.buffers\n+\n+ assert len(buffers) == 1\n+\n+ # A ready Request could contain multiple buffers if multiple streams\n+ # were being used. Here we know we only have a single stream,\n+ # and we use next(iter()) to get the first and only buffer.\n+\n+ stream, fb = next(iter(buffers.items()))\n+\n+ # Use MappedFrameBuffer to access the pixel data with CPU. We calculate\n+ # the crc for each plane.\n+\n+ with libcamera.utils.MappedFrameBuffer(fb) as mfb:\n+ crcs = [binascii.crc32(p) for p in mfb.planes]\n+\n+ meta = fb.metadata\n+\n+ print('buf {}, seq {}, bytes {}, CRCs {}'\n+ .format(req.cookie, meta.sequence, meta.bytesused, crcs))\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+ return True\n+\n+\n+def handle_key_envet(fileob):\n+ sys.stdin.readline()\n+ print(\"Exiting...\")\n+ return False\n+\n+\n+def capture(cm, cam, reqs):\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(cm, cam))\n+ sel.register(sys.stdin, selectors.EVENT_READ, handle_key_envet)\n+\n+ reqs = []\n+ running = True\n+\n+ while running:\n+ events = sel.select()\n+ for key, mask in events:\n+ running = 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+ capture(cm, cam, reqs)\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","11/19"]}