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{ "id": 15504, "url": "https://patchwork.libcamera.org/api/patches/15504/?format=api", "web_url": "https://patchwork.libcamera.org/patch/15504/", "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": "<20220322092257.2713521-8-naush@raspberrypi.com>", "date": "2022-03-22T09:22:56", "name": "[libcamera-devel,v4,7/8] libcamera: v4l2_videodevice: Empty the V4L2 buffer cache on streamOff()", "commit_ref": null, "pull_url": null, "state": "accepted", "archived": false, "hash": "e7fa881c0358ac6df00af49cf896672dc0184a05", "submitter": { "id": 34, "url": "https://patchwork.libcamera.org/api/people/34/?format=api", "name": "Naushir Patuck", "email": "naush@raspberrypi.com" }, "delegate": null, "mbox": "https://patchwork.libcamera.org/patch/15504/mbox/", "series": [ { "id": 2982, "url": "https://patchwork.libcamera.org/api/series/2982/?format=api", "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=2982", "date": "2022-03-22T09:22:49", "name": "Raspberry Pi: Efficient start/stop/start sequences", "version": 4, "mbox": "https://patchwork.libcamera.org/series/2982/mbox/" } ], "comments": "https://patchwork.libcamera.org/api/patches/15504/comments/", "check": "pending", "checks": "https://patchwork.libcamera.org/api/patches/15504/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 74255C3266\n\tfor <parsemail@patchwork.libcamera.org>;\n\tTue, 22 Mar 2022 09:23:10 +0000 (UTC)", "from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 0A095604E9;\n\tTue, 22 Mar 2022 10:23:10 +0100 (CET)", "from mail-wm1-x32b.google.com (mail-wm1-x32b.google.com\n\t[IPv6:2a00:1450:4864:20::32b])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 20DD4632E5\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tTue, 22 Mar 2022 10:23:06 +0100 (CET)", "by mail-wm1-x32b.google.com with SMTP id\n\tm26-20020a05600c3b1a00b0038c8b999f58so1033279wms.1\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tTue, 22 Mar 2022 02:23:06 -0700 (PDT)", "from naush-laptop.pitowers.org\n\t([2a00:1098:3142:14:9e9a:99af:e5a6:319b])\n\tby smtp.gmail.com with ESMTPSA id\n\tr14-20020a05600c35ce00b0038c9f469979sm1471695wmq.40.2022.03.22.02.23.04\n\t(version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);\n\tTue, 22 Mar 2022 02:23:05 -0700 (PDT)" ], "DKIM-Signature": [ "v=1; 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dkim=pass (2048-bit key; \n\tunprotected) header.d=raspberrypi.com\n\theader.i=@raspberrypi.com\n\theader.b=\"DbbwHCmY\"; dkim-atps=neutral", "X-Google-DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed;\n\td=1e100.net; s=20210112;\n\th=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to\n\t:references:mime-version:content-transfer-encoding;\n\tbh=TdgSbJYfrkGKhFpU5Csv2hwqt6vlahDqMHurCng86MM=;\n\tb=UsWoWX4c3befrl7SVgOEhe4uocOOPjaUs3MAf125TuvIbVY4knQjz27L/aBJKfyLWH\n\tS4JrMn0SNn0kpporRaUkBsZ57qw3zptS5i2TFmreW74KT3iA6VUTFWDRWcpgKQ2xasdi\n\tIrfRrMMvchdOSrjUtesTMkFzs+1Y26644Kg+DwK2cXS5DXrrZPI88nTMfHUwsKcADAgv\n\taR/VCjl64a8DOEkcoEo9s9LYPujR2BPdAgXk91b+w0A5qvFbAI/TbyddfkvWdrRy4GpI\n\tBoBM08MBFi4feoIugCalKfkmzPXY/7NTAo4OvQUXce+EuBo/CIAK4nnNfjy1uabECeck\n\tc7EQ==", "X-Gm-Message-State": "AOAM5310UjhP9kwZBAgns94MExsd7l5Suan+0ayBlvO9CW+F4orX27TO\n\tlcmT9IXUK6+hAQCHtua9Z7NEoysjBS0Gqw==", "X-Google-Smtp-Source": "ABdhPJzbDNnj7MqqKrq3iGw0zqRPh0kul1HrO7Ep96KVUpUOVnWNvFtpXQb1ucyHygh+hTPKjBX9NQ==", "X-Received": "by 2002:a05:600c:2244:b0:38c:a3ff:ef67 with SMTP id\n\ta4-20020a05600c224400b0038ca3ffef67mr2694603wmm.122.1647940985582; \n\tTue, 22 Mar 2022 02:23:05 -0700 (PDT)", "To": "libcamera-devel@lists.libcamera.org", "Date": "Tue, 22 Mar 2022 09:22:56 +0000", "Message-Id": "<20220322092257.2713521-8-naush@raspberrypi.com>", "X-Mailer": "git-send-email 2.25.1", "In-Reply-To": "<20220322092257.2713521-1-naush@raspberrypi.com>", "References": "<20220322092257.2713521-1-naush@raspberrypi.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Subject": "[libcamera-devel] [PATCH v4 7/8] libcamera: v4l2_videodevice: Empty\n\tthe V4L2 buffer cache on streamOff()", "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": "Naushir Patuck via libcamera-devel\n\t<libcamera-devel@lists.libcamera.org>", "Reply-To": "Naushir Patuck <naush@raspberrypi.com>", "Errors-To": "libcamera-devel-bounces@lists.libcamera.org", "Sender": "\"libcamera-devel\" <libcamera-devel-bounces@lists.libcamera.org>" }, "content": "When streamOff() is called, ensure the cache entries for the remaining queued\nbuffers are freed since this will not happen via the dequeueBuffer() mechanism.\n\nAdditionally, add a V4L2BufferCache::isEmpty() function and assert that the\ncache is empty at the end of the streamOff() call.\n\nSigned-off-by: Naushir Patuck <naush@raspberrypi.com>\nTested-by: David Plowman <david.plowman@raspberrypi.com>\nReviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>\nReviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>\n---\n include/libcamera/internal/v4l2_videodevice.h | 1 +\n src/libcamera/v4l2_videodevice.cpp | 16 ++++++++++++++++\n 2 files changed, 17 insertions(+)", "diff": "diff --git a/include/libcamera/internal/v4l2_videodevice.h b/include/libcamera/internal/v4l2_videodevice.h\nindex 32e022543385..60d62212bfe1 100644\n--- a/include/libcamera/internal/v4l2_videodevice.h\n+++ b/include/libcamera/internal/v4l2_videodevice.h\n@@ -124,6 +124,7 @@ public:\n \tV4L2BufferCache(const std::vector<std::unique_ptr<FrameBuffer>> &buffers);\n \t~V4L2BufferCache();\n \n+\tbool isEmpty() const;\n \tint get(const FrameBuffer &buffer);\n \tvoid put(unsigned int index);\n \ndiff --git a/src/libcamera/v4l2_videodevice.cpp b/src/libcamera/v4l2_videodevice.cpp\nindex 1516be129d73..a384de7507ba 100644\n--- a/src/libcamera/v4l2_videodevice.cpp\n+++ b/src/libcamera/v4l2_videodevice.cpp\n@@ -201,6 +201,19 @@ V4L2BufferCache::~V4L2BufferCache()\n \t\tLOG(V4L2, Debug) << \"Cache misses: \" << missCounter_;\n }\n \n+/**\n+ * \\brief Check if all the entries in the cache are unused\n+ */\n+bool V4L2BufferCache::isEmpty() const\n+{\n+\tfor (auto const &entry : cache_) {\n+\t\tif (!entry.free_)\n+\t\t\treturn false;\n+\t}\n+\n+\treturn true;\n+}\n+\n /**\n * \\brief Find the best V4L2 buffer for a FrameBuffer\n * \\param[in] buffer The FrameBuffer\n@@ -1842,10 +1855,13 @@ int V4L2VideoDevice::streamOff()\n \tfor (auto it : queuedBuffers_) {\n \t\tFrameBuffer *buffer = it.second;\n \n+\t\tcache_->put(it.first);\n \t\tbuffer->metadata_.status = FrameMetadata::FrameCancelled;\n \t\tbufferReady.emit(buffer);\n \t}\n \n+\tASSERT(cache_->isEmpty());\n+\n \tqueuedBuffers_.clear();\n \tfdBufferNotifier_->setEnabled(false);\n \tstate_ = State::Stopped;\n", "prefixes": [ "libcamera-devel", "v4", "7/8" ] }