{"id":14636,"url":"https://patchwork.libcamera.org/api/patches/14636/?format=json","web_url":"https://patchwork.libcamera.org/patch/14636/","project":{"id":1,"url":"https://patchwork.libcamera.org/api/projects/1/?format=json","name":"libcamera","link_name":"libcamera","list_id":"libcamera_core","list_email":"libcamera-devel@lists.libcamera.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20211118164216.2669449-4-naush@raspberrypi.com>","date":"2021-11-18T16:42:15","name":"[libcamera-devel,v3,3/4] pipeline: raspberrypi: Increase the V4L2BufferCache slot allocations","commit_ref":"9c246b77e4982d4fbfdbf980df0d374547d7bfcc","pull_url":null,"state":"accepted","archived":false,"hash":"4844affc45cd6c2ad3eec8130b957b1a8dafa3a4","submitter":{"id":34,"url":"https://patchwork.libcamera.org/api/people/34/?format=json","name":"Naushir Patuck","email":"naush@raspberrypi.com"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/14636/mbox/","series":[{"id":2727,"url":"https://patchwork.libcamera.org/api/series/2727/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=2727","date":"2021-11-18T16:42:12","name":"raspberrypi: Rework the internal buffer allocation scheme","version":3,"mbox":"https://patchwork.libcamera.org/series/2727/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/14636/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/14636/checks/","tags":{},"headers":{"Return-Path":"","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 4A4F9BDB1C\n\tfor ;\n\tThu, 18 Nov 2021 16:43:22 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 012476036F;\n\tThu, 18 Nov 2021 17:43:22 +0100 (CET)","from mail-wm1-x32e.google.com (mail-wm1-x32e.google.com\n\t[IPv6:2a00:1450:4864:20::32e])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id C02C160233\n\tfor ;\n\tThu, 18 Nov 2021 17:43:19 +0100 (CET)","by mail-wm1-x32e.google.com with SMTP id\n\tk37-20020a05600c1ca500b00330cb84834fso8151130wms.2\n\tfor ;\n\tThu, 18 Nov 2021 08:43:19 -0800 (PST)","from naush-laptop.pitowers.org\n\t([2a00:1098:3142:14:328d:499d:f54a:e461])\n\tby smtp.gmail.com with ESMTPSA id\n\ta1sm496246wri.89.2021.11.18.08.43.16\n\t(version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);\n\tThu, 18 Nov 2021 08:43:16 -0800 (PST)"],"Authentication-Results":"lancelot.ideasonboard.com;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n\tunprotected) header.d=raspberrypi.com header.i=@raspberrypi.com\n\theader.b=\"Y5PIHFv6\"; 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\n\tThu, 18 Nov 2021 08:43:19 -0800 (PST)","From":"Naushir Patuck ","To":"libcamera-devel@lists.libcamera.org","Date":"Thu, 18 Nov 2021 16:42:15 +0000","Message-Id":"<20211118164216.2669449-4-naush@raspberrypi.com>","X-Mailer":"git-send-email 2.25.1","In-Reply-To":"<20211118164216.2669449-1-naush@raspberrypi.com>","References":"<20211118164216.2669449-1-naush@raspberrypi.com>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","Subject":"[libcamera-devel] [PATCH v3 3/4] pipeline: raspberrypi: Increase\n\tthe V4L2BufferCache slot allocations","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "},"content":"If a stream is marked as external, double the number of V4L2BufferCache slots\nthat are allocated. This is to account for additional buffers that may be\nallocated directly by the application.\n\nSigned-off-by: Naushir Patuck \nReviewed-by: Kieran Bingham \nReviewed-by: Umang Jain \nReviewed-by: Laurent Pinchart \n---\n src/libcamera/pipeline/raspberrypi/rpi_stream.cpp | 11 +++++++++++\n 1 file changed, 11 insertions(+)","diff":"diff --git a/src/libcamera/pipeline/raspberrypi/rpi_stream.cpp b/src/libcamera/pipeline/raspberrypi/rpi_stream.cpp\nindex b3265d0e8aab..bab80d25ad1a 100644\n--- a/src/libcamera/pipeline/raspberrypi/rpi_stream.cpp\n+++ b/src/libcamera/pipeline/raspberrypi/rpi_stream.cpp\n@@ -107,6 +107,17 @@ int Stream::prepareBuffers(unsigned int count)\n \t\tcount = bufferMap_.size();\n \t}\n \n+\t/*\n+\t * If this is an external stream, we must allocate slots for buffers that\n+\t * might be externally allocated. We have no indication of how many buffers\n+\t * may be used, so this might overallocate slots in the buffer cache.\n+\t *\n+\t * \\todo Find a better heuristic, or, even better, an exact solution to\n+\t * this issue.\n+\t */\n+\tif (isExternal())\n+\t\tcount = count * 2;\n+\n \treturn dev_->importBuffers(count);\n }\n \n","prefixes":["libcamera-devel","v3","3/4"]}