{"id":16121,"url":"https://patchwork.libcamera.org/api/patches/16121/?format=json","web_url":"https://patchwork.libcamera.org/patch/16121/","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":"<20220530142722.57618-15-tomi.valkeinen@ideasonboard.com>","date":"2022-05-30T14:27:20","name":"[libcamera-devel,v4,14/16] py: examples: Add simple-continuous-capture.py","commit_ref":null,"pull_url":null,"state":"superseded","archived":false,"hash":"3e429c94bb000098c7da4323f48abe46fd15e2d9","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/16121/mbox/","series":[{"id":3149,"url":"https://patchwork.libcamera.org/api/series/3149/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=3149","date":"2022-05-30T14:27:06","name":"More misc Python patches","version":4,"mbox":"https://patchwork.libcamera.org/series/3149/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/16121/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/16121/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 A16B4C3278\n\tfor ;\n\tMon, 30 May 2022 14:27:55 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 1C5FF65658;\n\tMon, 30 May 2022 16:27:55 +0200 (CEST)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 6A3DD6564E\n\tfor ;\n\tMon, 30 May 2022 16:27:46 +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 D7EDD6BD;\n\tMon, 30 May 2022 16:27:45 +0200 (CEST)"],"DKIM-Signature":["v=1; a=rsa-sha256; c=relaxed/simple; d=libcamera.org;\n\ts=mail; t=1653920875;\n\tbh=aKA4jstH6cyqJmG0C/jiNqrb9//1jSJbxG3xC5syilw=;\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=CJF1SYuh7DtJ1C7ppMd4TSVACJsJBkH1UvKW9wi35HHXCJGKD3vTSk5wbMR0cUAxH\n\tG0da889vCgmIKWRTlFJV5zaFONwBmRrQpf+ppc0C1fMf7Jek6OXwq4wSVEXHQ3gWPE\n\tvPEJbP+2CCUBovZpx1jvARrMWvsJN/LxT4bRFK4VpqGuR7WGbMAnk4HiQcqG9aCdJW\n\tG0YzQhZV6Nnb+r8K4J3hVy9S7FpndFnA95rcJjc2Bpb+xml/qjBg7lN1UBPGWLJ6Xk\n\t/cIJp52Qo9+Ra0HXK3asUTyL89iuqtIzlCwqGdJb34hw/c6byy5zSo4QeburWFu+1F\n\tIyOTkyAqN/+sA==","v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1653920866;\n\tbh=aKA4jstH6cyqJmG0C/jiNqrb9//1jSJbxG3xC5syilw=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=jNxXjMiMc0yzKjLOA+SvBspo25a6kX4OvcCAvVqaQA2orJUI+E3oxVrUGi5oftRq7\n\t2AOFf1ZM6vlPtMozP0UdTydnf8lDYnRYZYo1FAH47ICV1Y8SbVSwQ00R/x+kX4k6Ek\n\tk3KkpyXwzw7LPRyGIogk09xHa2mr+K/vN8UBPnes="],"Authentication-Results":"lancelot.ideasonboard.com; dkim=pass (1024-bit key; \n\tunprotected) header.d=ideasonboard.com\n\theader.i=@ideasonboard.com\n\theader.b=\"jNxXjMiM\"; dkim-atps=neutral","To":"libcamera-devel@lists.libcamera.org,\n\tDavid Plowman ,\n\tKieran Bingham ,\n\tLaurent Pinchart ,\n\tJacopo Mondi ","Date":"Mon, 30 May 2022 17:27:20 +0300","Message-Id":"<20220530142722.57618-15-tomi.valkeinen@ideasonboard.com>","X-Mailer":"git-send-email 2.34.1","In-Reply-To":"<20220530142722.57618-1-tomi.valkeinen@ideasonboard.com>","References":"<20220530142722.57618-1-tomi.valkeinen@ideasonboard.com>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","Subject":"[libcamera-devel] [PATCH v4 14/16] 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 | 189 +++++++++++++++++++\n 1 file changed, 189 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..d0f8a7e9\n--- /dev/null\n+++ b/src/py/examples/simple-continuous-capture.py\n@@ -0,0 +1,189 @@\n+#!/usr/bin/env python3\n+\n+# SPDX-License-Identifier: BSD-3-Clause\n+# Copyright (C) 2022, Tomi Valkeinen \n+\n+# A simple capture example extending the simple-capture.py example:\n+# - Capture frames using events from multiple cameras\n+# - Listening events from stdin to exit the application\n+# - Memory mapping the frames and calculating CRC\n+\n+import binascii\n+import libcamera as libcam\n+import libcamera.utils\n+import selectors\n+import sys\n+\n+\n+# A container class for our state per camera\n+class CameraCaptureContext:\n+ idx: int\n+ cam: libcam.Camera\n+ reqs: list[libcam.Request]\n+ mfbs: dict[libcam.FrameBuffer, libcamera.utils.MappedFrameBuffer]\n+\n+ def __init__(self, cam, idx):\n+ # Acquire the camera for our use\n+\n+ ret = cam.acquire()\n+ assert ret == 0\n+\n+ # Configure the camera\n+\n+ cam_config = cam.generate_configuration([libcam.StreamRole.Viewfinder])\n+\n+ stream_config = cam_config.at(0)\n+\n+ ret = cam.configure(cam_config)\n+ assert ret == 0\n+\n+ stream = stream_config.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'cam{idx} ({cam.id}): capturing {num_bufs} buffers with {stream_config}')\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(idx)\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+ self.idx = idx\n+ self.cam = cam\n+ self.reqs = reqs\n+ self.mfbs = dict([(fb, libcamera.utils.MappedFrameBuffer(fb).mmap()) for fb in allocator.buffers(stream)])\n+\n+ def uninit_camera(self):\n+ # Stop the camera\n+\n+ ret = self.cam.stop()\n+ assert ret == 0\n+\n+ # Release the camera\n+\n+ ret = self.cam.release()\n+ assert ret == 0\n+\n+\n+# A container class for our state\n+class CaptureContext:\n+ cm: libcam.CameraManager\n+ camera_contexts: list[CameraCaptureContext] = []\n+\n+ def handle_camera_event(self):\n+ # cm.get_ready_requests() will not block here, as we know there is an event\n+ # to read.\n+\n+ reqs = self.cm.get_ready_requests()\n+\n+ # Process the captured frames\n+\n+ for req in reqs:\n+ self.handle_request(req)\n+\n+ return True\n+\n+ def handle_request(self, req: libcam.Request):\n+ cam_ctx = self.camera_contexts[req.cookie]\n+\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 the MappedFrameBuffer to access the pixel data with CPU. We calculate\n+ # the crc for each plane.\n+\n+ mfb = cam_ctx.mfbs[fb]\n+ crcs = [binascii.crc32(p) for p in mfb.planes]\n+\n+ meta = fb.metadata\n+\n+ print('cam{:<6} seq {:<6} bytes {:10} CRCs {}'\n+ .format(cam_ctx.idx,\n+ meta.sequence,\n+ '/'.join([str(p.bytes_used) for p in meta.planes]),\n+ 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_ctx.cam.queue_request(req)\n+\n+ def capture(self):\n+ # Queue the requests to the camera\n+\n+ for cam_ctx in self.camera_contexts:\n+ for req in cam_ctx.reqs:\n+ ret = cam_ctx.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(sys.stdin, selectors.EVENT_READ, handle_key_event)\n+ sel.register(self.cm.event_fd, selectors.EVENT_READ, lambda: self.handle_camera_event())\n+\n+ running = True\n+\n+ while running:\n+ events = sel.select()\n+ for key, mask in events:\n+ # If the handler return False, we should exit\n+ if not key.data():\n+ running = False\n+\n+\n+def handle_key_event():\n+ sys.stdin.readline()\n+ print('Exiting...')\n+ return False\n+\n+\n+def main():\n+ cm = libcam.CameraManager.singleton()\n+\n+ ctx = CaptureContext()\n+ ctx.cm = cm\n+\n+ for idx, cam in enumerate(cm.cameras):\n+ cam_ctx = CameraCaptureContext(cam, idx)\n+ ctx.camera_contexts.append(cam_ctx)\n+\n+ # Start the cameras\n+\n+ for cam_ctx in ctx.camera_contexts:\n+ ret = cam_ctx.cam.start()\n+ assert ret == 0\n+\n+ ctx.capture()\n+\n+ for cam_ctx in ctx.camera_contexts:\n+ cam_ctx.uninit_camera()\n+\n+ return 0\n+\n+\n+if __name__ == '__main__':\n+ sys.exit(main())\n","prefixes":["libcamera-devel","v4","14/16"]}