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{ "id": 3949, "url": "https://patchwork.libcamera.org/api/patches/3949/?format=api", "web_url": "https://patchwork.libcamera.org/patch/3949/", "project": { "id": 1, "url": "https://patchwork.libcamera.org/api/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": "<20200605141002.49119-6-jacopo@jmondi.org>", "date": "2020-06-05T14:09:59", "name": "[libcamera-devel,v3,5/8] libcamera: properties: Add FrameDurationLimits", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": true, "hash": "4dc94547fcc1497d04c2fe287cbe9baccc75dd7a", "submitter": { "id": 3, "url": "https://patchwork.libcamera.org/api/people/3/?format=api", "name": "Jacopo Mondi", "email": "jacopo@jmondi.org" }, "delegate": { "id": 15, "url": "https://patchwork.libcamera.org/api/users/15/?format=api", "username": "jmondi", "first_name": "Jacopo", "last_name": "Mondi", "email": "jacopo@jmondi.org" }, "mbox": "https://patchwork.libcamera.org/patch/3949/mbox/", "series": [ { "id": 958, "url": "https://patchwork.libcamera.org/api/series/958/?format=api", "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=958", "date": "2020-06-05T14:09:54", "name": "android: Build stream configuration map", "version": 3, "mbox": "https://patchwork.libcamera.org/series/958/mbox/" } ], "comments": "https://patchwork.libcamera.org/api/patches/3949/comments/", "check": "pending", "checks": "https://patchwork.libcamera.org/api/patches/3949/checks/", "tags": {}, "headers": { "Return-Path": "<jacopo@jmondi.org>", "Received": [ "from relay7-d.mail.gandi.net (relay7-d.mail.gandi.net\n\t[217.70.183.200])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 6E7CB61645\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tFri, 5 Jun 2020 16:07:11 +0200 (CEST)", "from localhost.localdomain (93-34-118-233.ip49.fastwebnet.it\n\t[93.34.118.233]) (Authenticated sender: jacopo@jmondi.org)\n\tby relay7-d.mail.gandi.net (Postfix) with ESMTPSA id A143120003;\n\tFri, 5 Jun 2020 14:07:10 +0000 (UTC)" ], "X-Originating-IP": "93.34.118.233", "From": "Jacopo Mondi <jacopo@jmondi.org>", "To": "libcamera-devel@lists.libcamera.org", "Date": "Fri, 5 Jun 2020 16:09:59 +0200", "Message-Id": "<20200605141002.49119-6-jacopo@jmondi.org>", "X-Mailer": "git-send-email 2.27.0", "In-Reply-To": "<20200605141002.49119-1-jacopo@jmondi.org>", "References": "<20200605141002.49119-1-jacopo@jmondi.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Subject": "[libcamera-devel] [PATCH v3 5/8] libcamera: properties: Add\n\tFrameDurationLimits", "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>", "X-List-Received-Date": "Fri, 05 Jun 2020 14:07:11 -0000" }, "content": "Add a camera property to express the minimum and maximum frame durations.\n\nSigned-off-by: Jacopo Mondi <jacopo@jmondi.org>\n---\n\nCc Naush and Dave as this could potentially conflict with their on-going FPS\nhandling series. Sending it out for discussion.\n\n---\n src/libcamera/property_ids.yaml | 47 +++++++++++++++++++++++++++++++++\n 1 file changed, 47 insertions(+)\n\n--\n2.27.0", "diff": "diff --git a/src/libcamera/property_ids.yaml b/src/libcamera/property_ids.yaml\nindex ce627fa042ba..d703ab31eaac 100644\n--- a/src/libcamera/property_ids.yaml\n+++ b/src/libcamera/property_ids.yaml\n@@ -386,4 +386,51 @@ controls:\n | |\n | |\n +--------------------+\n+\n+ - FrameDurationLimits:\n+ type: int32_t\n+ size: [2]\n+ description: |\n+ The camera supported frame durations interval.\n+\n+ This property reports the camera minimum and maximum frame durations (in\n+ this order) expressed in nanoseconds to report the limits of the\n+ achievable frame rate.\n+\n+ Camera devices should here report durations calculated by inspecting the\n+ camera sensor supported frame rate interval, and adding to it any\n+ known additional delay caused by the image acquisition process that\n+ incurs in the time between a frame is captured and delivered to\n+ applications.\n+\n+ The here reported durations represent the time interval that occurs\n+ between the delivery of two consecutive frames for the fastest and\n+ slower streams, without considering additional delays introduced by the\n+ sharing of system resources when multiple streams are captured at the\n+ same time.\n+\n+ This implies that the minimum reported frame duration, which corresponds\n+ to the highest possible camera frame rate, is calculated without taking\n+ into consideration how multiple streams capture requests sent to\n+ the camera as part of the same capture session might influence the frame\n+ delivery rate by, in example, introducing delays due to the requirement\n+ of time-sharing components part of the image acquisition pipeline. In\n+ example, request containing two scaled-down streams might require\n+ time-sharing the single scaler available in the system, introducing an\n+ additional delay that prevents the camera to deliver frames at the\n+ here reported rate.\n+\n+ In the same way, the maximum frame duration, which corresponds to the\n+ lowest possible frame rate, does not take into consideration additional\n+ processing delays introduced by image encoding and processing that\n+ happens sporadically, in example, to produce still images in JPEG\n+ format.\n+\n+ As a consequence, application should inspect this property to know the\n+ camera capability limits, but should not assume the here reported values\n+ are achievable under all circumstances.\n+\n+ # \\todo Expand to better describe how stalling streams (ie JPEG) impacts\n+ # the frame rate calculation.\n+\n ...\n", "prefixes": [ "libcamera-devel", "v3", "5/8" ] }