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{
    "id": 27090,
    "url": "https://patchwork.libcamera.org/api/1.1/patches/27090/?format=api",
    "web_url": "https://patchwork.libcamera.org/patch/27090/",
    "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": "<20260629163017.863145-12-barnabas.pocze@ideasonboard.com>",
    "date": "2026-06-29T16:29:34",
    "name": "[RFC,v1,11/54] v4l2: v4l2_camera: Use actually allocated buffer count",
    "commit_ref": null,
    "pull_url": null,
    "state": "new",
    "archived": false,
    "hash": "3e6bb25ad537ab12322c1ae25783e00f52a46a92",
    "submitter": {
        "id": 216,
        "url": "https://patchwork.libcamera.org/api/1.1/people/216/?format=api",
        "name": "Barnabás Pőcze",
        "email": "barnabas.pocze@ideasonboard.com"
    },
    "delegate": null,
    "mbox": "https://patchwork.libcamera.org/patch/27090/mbox/",
    "series": [
        {
            "id": 6025,
            "url": "https://patchwork.libcamera.org/api/1.1/series/6025/?format=api",
            "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=6025",
            "date": "2026-06-29T16:29:23",
            "name": "libcamera: Split requests and buffers",
            "version": 1,
            "mbox": "https://patchwork.libcamera.org/series/6025/mbox/"
        }
    ],
    "comments": "https://patchwork.libcamera.org/api/patches/27090/comments/",
    "check": "pending",
    "checks": "https://patchwork.libcamera.org/api/patches/27090/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 5CCEDC3261\n\tfor <parsemail@patchwork.libcamera.org>;\n\tMon, 29 Jun 2026 16:30:55 +0000 (UTC)",
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        ],
        "Authentication-Results": "lancelot.ideasonboard.com; dkim=pass (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"cW4UpPIC\"; dkim-atps=neutral",
        "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1782750580;\n\tbh=r3Ov2KlKaxR7pacYvNpNxeN12yMks/mdafjXn3FC/mA=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=cW4UpPICUqDu943Gtm5G3j3kBQq3agO7JQIumTWAFcgGeHP4GyGhMVQFXxLLHANx/\n\toh53JX9IJQNsSei7Kk95EJCBs48dfRYpGy37QcCd+Ml+RcAxVh0UaBx1pJHByQUg0c\n\tMSHoTNSaOc03VnxmIC4C9kYSxhbHbVr+7/ewjsX8=",
        "From": "=?utf-8?q?Barnab=C3=A1s_P=C5=91cze?= <barnabas.pocze@ideasonboard.com>",
        "To": "libcamera-devel@lists.libcamera.org",
        "Cc": "Jacopo Mondi <jacopo.mondi@ideasonboard.com>",
        "Subject": "[RFC PATCH v1 11/54] v4l2: v4l2_camera: Use actually allocated\n\tbuffer count",
        "Date": "Mon, 29 Jun 2026 18:29:34 +0200",
        "Message-ID": "<20260629163017.863145-12-barnabas.pocze@ideasonboard.com>",
        "X-Mailer": "git-send-email 2.54.0",
        "In-Reply-To": "<20260629163017.863145-1-barnabas.pocze@ideasonboard.com>",
        "References": "<20260629163017.863145-1-barnabas.pocze@ideasonboard.com>",
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        "Content-Type": "text/plain; charset=UTF-8",
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        "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>",
        "Errors-To": "libcamera-devel-bounces@lists.libcamera.org",
        "Sender": "\"libcamera-devel\" <libcamera-devel-bounces@lists.libcamera.org>"
    },
    "content": "Make `V4L2Camera::allocBuffers()` simply create as many requests as the\nnumber of buffers allocated instead of taking it as an argument. The two\nshould be the same, so no functional changes intended.\n\nSigned-off-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>\nReviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>\n---\n src/v4l2/v4l2_camera.cpp       |  8 +++++---\n src/v4l2/v4l2_camera.h         |  2 +-\n src/v4l2/v4l2_camera_proxy.cpp | 10 +++++-----\n 3 files changed, 11 insertions(+), 9 deletions(-)",
    "diff": "diff --git a/src/v4l2/v4l2_camera.cpp b/src/v4l2/v4l2_camera.cpp\nindex 648578c22b..75428b8adc 100644\n--- a/src/v4l2/v4l2_camera.cpp\n+++ b/src/v4l2/v4l2_camera.cpp\n@@ -154,7 +154,7 @@ int V4L2Camera::validateConfiguration(const PixelFormat &pixelFormat,\n \treturn 0;\n }\n \n-int V4L2Camera::allocBuffers(unsigned int count)\n+int V4L2Camera::allocBuffers()\n {\n \tStream *stream = config_->at(0).stream();\n \n@@ -162,7 +162,9 @@ int V4L2Camera::allocBuffers(unsigned int count)\n \tif (ret < 0)\n \t\treturn ret;\n \n-\tfor (unsigned int i = 0; i < count; i++) {\n+\tconst auto &buffers = bufferAllocator_->buffers(stream);\n+\n+\tfor (size_t i = 0; i < buffers.size(); i++) {\n \t\tstd::unique_ptr<Request> request = camera_->createRequest(i);\n \t\tif (!request) {\n \t\t\trequestPool_.clear();\n@@ -171,7 +173,7 @@ int V4L2Camera::allocBuffers(unsigned int count)\n \t\trequestPool_.push_back(std::move(request));\n \t}\n \n-\treturn ret;\n+\treturn buffers.size();\n }\n \n void V4L2Camera::freeBuffers()\ndiff --git a/src/v4l2/v4l2_camera.h b/src/v4l2/v4l2_camera.h\nindex 1528f9aad8..8a58169d89 100644\n--- a/src/v4l2/v4l2_camera.h\n+++ b/src/v4l2/v4l2_camera.h\n@@ -54,7 +54,7 @@ public:\n \tlibcamera::ControlList &controls() { return controls_; }\n \tconst libcamera::ControlInfoMap &controlInfo() { return camera_->controls(); }\n \n-\tint allocBuffers(unsigned int count);\n+\tint allocBuffers();\n \tvoid freeBuffers();\n \tint getBufferFd(unsigned int index);\n \ndiff --git a/src/v4l2/v4l2_camera_proxy.cpp b/src/v4l2/v4l2_camera_proxy.cpp\nindex 94c0006cf3..ee44767bd3 100644\n--- a/src/v4l2/v4l2_camera_proxy.cpp\n+++ b/src/v4l2/v4l2_camera_proxy.cpp\n@@ -542,16 +542,16 @@ int V4L2CameraProxy::vidioc_reqbufs(V4L2CameraFile *file, struct v4l2_requestbuf\n \tif (ret < 0)\n \t\treturn -EINVAL;\n \n-\tsetFmtFromConfig(streamConfig_);\n-\n-\targ->count = streamConfig_.bufferCount;\n-\n-\tret = vcam_->allocBuffers(arg->count);\n+\tret = vcam_->allocBuffers();\n \tif (ret < 0) {\n \t\targ->count = 0;\n \t\treturn ret;\n \t}\n \n+\targ->count = ret;\n+\n+\tsetFmtFromConfig(streamConfig_);\n+\n \tbuffers_.resize(arg->count);\n \tfor (unsigned int i = 0; i < arg->count; i++) {\n \t\tstruct v4l2_buffer buf = {};\n",
    "prefixes": [
        "RFC",
        "v1",
        "11/54"
    ]
}