From patchwork Fri May 27 14:44:45 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomi Valkeinen X-Patchwork-Id: 16100 Return-Path: X-Original-To: parsemail@patchwork.libcamera.org Delivered-To: parsemail@patchwork.libcamera.org Received: from lancelot.ideasonboard.com (lancelot.ideasonboard.com [92.243.16.209]) by patchwork.libcamera.org (Postfix) with ESMTPS id 64DBBC3272 for ; Fri, 27 May 2022 14:45:42 +0000 (UTC) Received: from lancelot.ideasonboard.com (localhost [IPv6:::1]) by lancelot.ideasonboard.com (Postfix) with ESMTP id 0F430656AE; Fri, 27 May 2022 16:45:42 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=libcamera.org; s=mail; t=1653662742; bh=4bUvZI08LJR8WBjJhEchsq9ky0F9ZRthxJqNtX2L1Ag=; h=To:Date:In-Reply-To:References:Subject:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=oWlTvOo5x2BEQkoSb7yMMoD4AtglG/8Q+5ib6ZSYkmX9xK8iUDRJmyN9KQYeLKBs0 +b6h/ut8aZy+kvXBgfwdHuuqeZ8JK7GHAl9X0GMdZZmavFtb4qBdeIatYhmOkgQzoE UZMElfXN8F1QzAN8G3xPdlkpMgIkRFLc471fHXZpKWAtjHba4KECcSX1M96HUI6exx jZNXqGtrzPTTfHlcHe1QP69YIeeMmCR7CfryexJLlIHO7UYPjfRveFtDsDNW7eh49E kqJBbwMpX6JeNpO8M2cBXeEHPRQ9WonVAA6r5eteQarLFXrLwdh0Du6r+vX+hmwvkW cNQFcJ+DSfkrg== Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647]) by lancelot.ideasonboard.com (Postfix) with ESMTPS id 014F66565F for ; Fri, 27 May 2022 16:45:19 +0200 (CEST) Authentication-Results: lancelot.ideasonboard.com; dkim=pass (1024-bit key; unprotected) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="YvBrNj83"; dkim-atps=neutral Received: from deskari.lan (91-156-85-209.elisa-laajakaista.fi [91.156.85.209]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 6A1AB4D1A; Fri, 27 May 2022 16:45:18 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1653662718; bh=4bUvZI08LJR8WBjJhEchsq9ky0F9ZRthxJqNtX2L1Ag=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YvBrNj83K7gP8nqBN6EaD7WHTnQwJE53SGhSp9dFvoLzaUMDXPyONJ0pOtM06rNsI /r2TAGfLfeOZyTDYZckR8nH1tU0IOQ6yg4sZSocXtr9FSMluXxcrLc6Ko25eHRjwWG zohEILLZ0yP09pCzm4FSX1oVjNhChF2GuxH70mqs= To: libcamera-devel@lists.libcamera.org, David Plowman , Kieran Bingham , Laurent Pinchart , Jacopo Mondi Date: Fri, 27 May 2022 17:44:45 +0300 Message-Id: <20220527144447.94891-29-tomi.valkeinen@ideasonboard.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220527144447.94891-1-tomi.valkeinen@ideasonboard.com> References: <20220527144447.94891-1-tomi.valkeinen@ideasonboard.com> MIME-Version: 1.0 Subject: [libcamera-devel] [PATCH v3 28/30] py: examples: Add simple-continuous-capture.py X-BeenThere: libcamera-devel@lists.libcamera.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Tomi Valkeinen via libcamera-devel From: Tomi Valkeinen Reply-To: Tomi Valkeinen Errors-To: libcamera-devel-bounces@lists.libcamera.org Sender: "libcamera-devel" Add a slightly more complex, and I think a more realistic, example, where the script reacts to events and re-queues the buffers. Signed-off-by: Tomi Valkeinen --- src/py/examples/simple-continuous-capture.py | 201 +++++++++++++++++++ 1 file changed, 201 insertions(+) create mode 100755 src/py/examples/simple-continuous-capture.py diff --git a/src/py/examples/simple-continuous-capture.py b/src/py/examples/simple-continuous-capture.py new file mode 100755 index 00000000..1c4595f6 --- /dev/null +++ b/src/py/examples/simple-continuous-capture.py @@ -0,0 +1,201 @@ +#!/usr/bin/env python3 + +# SPDX-License-Identifier: BSD-3-Clause +# Copyright (C) 2022, Tomi Valkeinen + +# A simple minimal capture example showing: +# - How to setup the camera +# - Capture frames using events +# - How to requeue requests +# - Memory map the frames +# - How to stop the camera + +import argparse +import binascii +import libcamera as libcam +import libcamera.utils +import selectors +import sys + + +# A simple container class for our objects +class CaptureContext: + cm: libcam.CameraManager + cam: libcam.Camera + reqs: list[libcam.Request] + mfbs: dict[libcam.FrameBuffer, libcamera.utils.MappedFrameBuffer] + + +def handle_camera_event(ctx: CaptureContext): + # cm.read_event() will not block here, as we know there is an event to read. + # We have to read the event to clear it. + + ctx.cm.read_event() + + reqs = ctx.cm.get_ready_requests() + + # Process the captured frames + + for req in reqs: + handle_request(ctx, req) + + return True + + +def handle_request(ctx: CaptureContext, req: libcam.Request): + buffers = req.buffers + + assert len(buffers) == 1 + + # A ready Request could contain multiple buffers if multiple streams + # were being used. Here we know we only have a single stream, + # and we use next(iter()) to get the first and only buffer. + + stream, fb = next(iter(buffers.items())) + + # Use the MappedFrameBuffer to access the pixel data with CPU. We calculate + # the crc for each plane. + + mfb = ctx.mfbs[fb] + crcs = [binascii.crc32(p) for p in mfb.planes] + + meta = fb.metadata + + print('buf {}, seq {}, bytes {}, CRCs {}' + .format(req.cookie, + meta.sequence, + '/'.join([str(p.bytes_used) for p in meta.planes]), + crcs)) + + # We want to re-queue the buffer we just handled. Instead of creating + # a new Request, we re-use the old one. We need to call req.reuse() + # to re-initialize the Request before queuing. + + req.reuse() + ctx.cam.queue_request(req) + + +def handle_key_event(): + sys.stdin.readline() + print('Exiting...') + return False + + +def capture(ctx: CaptureContext): + # Queue the requests to the camera + + for req in ctx.reqs: + ret = ctx.cam.queue_request(req) + assert ret == 0 + + # Use Selector to wait for events from the camera and from the keyboard + + sel = selectors.DefaultSelector() + sel.register(ctx.cm.event_fd, selectors.EVENT_READ, lambda: handle_camera_event(ctx)) + sel.register(sys.stdin, selectors.EVENT_READ, handle_key_event) + + running = True + + while running: + events = sel.select() + for key, mask in events: + # If the handler return False, we should exit + if not key.data(): + running = False + + +def main(): + parser = argparse.ArgumentParser() + parser.add_argument('-c', '--camera', type=str, default='1', + help='Camera index number (starting from 1) or part of the name') + parser.add_argument('-f', '--format', type=str, help='Pixel format') + parser.add_argument('-s', '--size', type=str, help='Size ("WxH")') + args = parser.parse_args() + + cm = libcam.CameraManager.singleton() + + try: + if args.camera.isnumeric(): + cam_idx = int(args.camera) + cam = next((cam for i, cam in enumerate(cm.cameras) if i + 1 == cam_idx)) + else: + cam = next((cam for cam in cm.cameras if args.camera in cam.id)) + except Exception: + print(f'Failed to find camera "{args.camera}"') + return -1 + + # Acquire the camera for our use + + ret = cam.acquire() + assert ret == 0 + + # Configure the camera + + cam_config = cam.generate_configuration([libcam.StreamRole.Viewfinder]) + + stream_config = cam_config.at(0) + + if args.format: + fmt = libcam.PixelFormat(args.format) + stream_config.pixel_format = fmt + + if args.size: + 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 + + stream = stream_config.stream + + # Allocate the buffers for capture + + allocator = libcam.FrameBufferAllocator(cam) + ret = allocator.allocate(stream) + assert ret > 0 + + num_bufs = len(allocator.buffers(stream)) + + print(f'Capturing {stream_config} with {num_bufs} buffers from {cam.id}') + + # Create the requests and assign a buffer for each request + + reqs = [] + for i in range(num_bufs): + # Use the buffer index as the "cookie" + req = cam.create_request(i) + + buffer = allocator.buffers(stream)[i] + ret = req.add_buffer(stream, buffer) + assert ret == 0 + + reqs.append(req) + + # Start the camera + + ret = cam.start() + assert ret == 0 + + ctx = CaptureContext() + ctx.cm = cm + ctx.cam = cam + ctx.reqs = reqs + ctx.mfbs = dict([(fb, libcamera.utils.MappedFrameBuffer(fb).mmap()) for fb in allocator.buffers(stream)]) + + capture(ctx) + + # Stop the camera + + ret = cam.stop() + assert ret == 0 + + # Release the camera + + ret = cam.release() + assert ret == 0 + + return 0 + + +if __name__ == '__main__': + sys.exit(main())