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{ "id": 16019, "url": "https://patchwork.libcamera.org/api/1.1/patches/16019/?format=api", "web_url": "https://patchwork.libcamera.org/patch/16019/", "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": "<20220524114610.41848-15-tomi.valkeinen@ideasonboard.com>", "date": "2022-05-24T11:46:05", "name": "[libcamera-devel,v2,14/19] py: Add README.md", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": false, "hash": "6f12e6717028e15cf9488c1cac0adfc626b56590", "submitter": { "id": 109, "url":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/16019/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/16019/comments/", "check": "pending", "checks": "https://patchwork.libcamera.org/api/patches/16019/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 E14D4C326D\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 9765465689;\n\tTue, 24 May 2022 13:46:51 +0200 (CEST)", "from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 5D5786567A\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tTue, 24 May 2022 13:46:37 +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 CB2EF8DC;\n\tTue, 24 May 2022 13:46:36 +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=\"HUhx8KvI\"; 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 14:46:05 +0300", "Message-Id": "<20220524114610.41848-15-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 14/19] py: Add README.md", "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 basic README for the Python bindings. While not a proper doc, the\nREADME and the examples should give enough guidance for users who are\nsomewhat familiar with libcamera.\n\nSigned-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>\n---\n src/py/README.md | 61 ++++++++++++++++++++++++++++++++++++++++++++++++\n 1 file changed, 61 insertions(+)\n create mode 100644 src/py/README.md", "diff": "diff --git a/src/py/README.md b/src/py/README.md\nnew file mode 100644\nindex 00000000..0a763030\n--- /dev/null\n+++ b/src/py/README.md\n@@ -0,0 +1,61 @@\n+# Python Bindings for libcamera\n+\n+*WARNING* The bindings are under work, and the API will change.\n+\n+## Differences to the C++ API\n+\n+As a rule of thumb the bindings try to follow the C++ API when possible. This\n+chapter lists the differences.\n+\n+Mostly these differences fall under two categories:\n+\n+1. Differences caused by the inherent differences between C++ and Python.\n+These differences are usually caused by the use of threads or differences in\n+C++ vs Python memory management.\n+\n+2. Differences caused by the code being work-in-progress. It's not always\n+trivial to create a binding in a satisfying way, and the current bindings\n+contain simplified versions of the C++ API just to get forward. These\n+differences are expected to eventually go away.\n+\n+### Coding Style\n+\n+The C++ code for the bindings follows the libcamera coding style as much as\n+possible. Note that the indentation does not quite follow the clang-format\n+style, as clang-format makes a mess of the style used.\n+\n+The API visible to Python side follows Python style as much as possible.\n+\n+This means that e.g. `Camera::generateConfiguration` maps to\n+`Camera.generate_configuration`.\n+\n+### CameraManager\n+\n+The Python API provides a singleton CameraManager via `CameraManager.singleton()`.\n+There is no need to start or stop the CameraManager.\n+\n+### Handling Completed Requests\n+\n+The Python bindings does not expose the Camera::requestCompleted signal\n+directly as the signal is invoked from another thread and it has real-time\n+constraints. Instead the bindings will internally queue the completed\n+requests and use an eventfd to inform the user that there are completed\n+requests.\n+\n+The user can wait on the eventfd, and upon getting an event, use\n+CameraManager.read_event() to clear the eventfd event and\n+CameraManager.get_ready_requests() to get the completed requests.\n+\n+### Controls & Properties\n+\n+The classes related to controls and properties are rather complex to implement\n+directly in the Python bindings. There are some simplifications on the Python\n+bindings:\n+\n+- There is no ControlValue class. Python objects are automatically converted\n+ to ControlValues and vice versa.\n+- There is no ControlList class. A python dict with ControlId keys and python\n+ object values is used instead.\n+- There is no ControlInfoMap class. A python dict with ControlId keys and\n+ ControlInfo values is used instead.\n+\n", "prefixes": [ "libcamera-devel", "v2", "14/19" ] }