{"id":15548,"url":"https://patchwork.libcamera.org/api/patches/15548/?format=json","web_url":"https://patchwork.libcamera.org/patch/15548/","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":"<20220325090903.880311-6-naush@raspberrypi.com>","date":"2022-03-25T09:09:00","name":"[libcamera-devel,v5,5/8] libcamera: v4l2_videodevice: Better tracking of the device state","commit_ref":null,"pull_url":null,"state":"accepted","archived":false,"hash":"50a66aae867b71fcf6b05f89d2f7648b8098e446","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/15548/mbox/","series":[{"id":2999,"url":"https://patchwork.libcamera.org/api/series/2999/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=2999","date":"2022-03-25T09:08:55","name":"Raspberry Pi: Efficient start/stop/start sequences","version":5,"mbox":"https://patchwork.libcamera.org/series/2999/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/15548/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/15548/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 35145C3264\n\tfor ;\n\tFri, 25 Mar 2022 09:09:17 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id E65CD604D5;\n\tFri, 25 Mar 2022 10:09:16 +0100 (CET)","from mail-wm1-x331.google.com (mail-wm1-x331.google.com\n\t[IPv6:2a00:1450:4864:20::331])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 5483B604C4\n\tfor ;\n\tFri, 25 Mar 2022 10:09:13 +0100 (CET)","by mail-wm1-x331.google.com with SMTP id\n\t123-20020a1c1981000000b0038b3616a71aso3978129wmz.4\n\tfor ;\n\tFri, 25 Mar 2022 02:09:13 -0700 (PDT)","from naush-laptop.pitowers.org\n\t([2a00:1098:3142:14:478c:773f:4734:d0bc])\n\tby smtp.gmail.com with ESMTPSA id\n\tc4-20020a056000184400b0020584c40778sm4915297wri.103.2022.03.25.02.09.10\n\t(version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);\n\tFri, 25 Mar 2022 02:09:10 -0700 (PDT)"],"DKIM-Signature":["v=1; 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\n\tFri, 25 Mar 2022 02:09:11 -0700 (PDT)","To":"libcamera-devel@lists.libcamera.org","Date":"Fri, 25 Mar 2022 09:09:00 +0000","Message-Id":"<20220325090903.880311-6-naush@raspberrypi.com>","X-Mailer":"git-send-email 2.25.1","In-Reply-To":"<20220325090903.880311-1-naush@raspberrypi.com>","References":"<20220325090903.880311-1-naush@raspberrypi.com>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","Subject":"[libcamera-devel] [PATCH v5 5/8] libcamera: v4l2_videodevice:\n\tBetter tracking of the device state","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","From":"Naushir Patuck via libcamera-devel\n\t","Reply-To":"Naushir Patuck ","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "},"content":"Replace the existing streaming_ state variable with an enum to track the\nfollowing three state: Streaming, Stopping, and Stopped. The alternate states\nwill be used in a subsequent commit.\n\nSigned-off-by: Naushir Patuck \n---\n include/libcamera/internal/v4l2_videodevice.h | 3 ++-\n src/libcamera/v4l2_videodevice.cpp | 10 ++++++----\n 2 files changed, 8 insertions(+), 5 deletions(-)","diff":"diff --git a/include/libcamera/internal/v4l2_videodevice.h b/include/libcamera/internal/v4l2_videodevice.h\nindex 2d2ccc477c91..32e022543385 100644\n--- a/include/libcamera/internal/v4l2_videodevice.h\n+++ b/include/libcamera/internal/v4l2_videodevice.h\n@@ -258,7 +258,8 @@ private:\n \n \tEventNotifier *fdBufferNotifier_;\n \n-\tbool streaming_;\n+\tenum class State { Streaming, Stopping, Stopped };\n+\tState state_;\n };\n \n class V4L2M2MDevice\ndiff --git a/src/libcamera/v4l2_videodevice.cpp b/src/libcamera/v4l2_videodevice.cpp\nindex 5f36ee20710d..9cea6a608660 100644\n--- a/src/libcamera/v4l2_videodevice.cpp\n+++ b/src/libcamera/v4l2_videodevice.cpp\n@@ -507,7 +507,7 @@ const std::string V4L2DeviceFormat::toString() const\n */\n V4L2VideoDevice::V4L2VideoDevice(const std::string &deviceNode)\n \t: V4L2Device(deviceNode), formatInfo_(nullptr), cache_(nullptr),\n-\t fdBufferNotifier_(nullptr), streaming_(false)\n+\t fdBufferNotifier_(nullptr), state_(State::Stopped)\n {\n \t/*\n \t * We default to an MMAP based CAPTURE video device, however this will\n@@ -1796,7 +1796,7 @@ int V4L2VideoDevice::streamOn()\n \t\treturn ret;\n \t}\n \n-\tstreaming_ = true;\n+\tstate_ = State::Streaming;\n \n \treturn 0;\n }\n@@ -1818,7 +1818,7 @@ int V4L2VideoDevice::streamOff()\n {\n \tint ret;\n \n-\tif (!streaming_ && queuedBuffers_.empty())\n+\tif (state_ != State::Streaming && queuedBuffers_.empty())\n \t\treturn 0;\n \n \tret = ioctl(VIDIOC_STREAMOFF, &bufferType_);\n@@ -1828,6 +1828,8 @@ int V4L2VideoDevice::streamOff()\n \t\treturn ret;\n \t}\n \n+\tstate_ = State::Stopping;\n+\n \t/* Send back all queued buffers. */\n \tfor (auto it : queuedBuffers_) {\n \t\tFrameBuffer *buffer = it.second;\n@@ -1838,7 +1840,7 @@ int V4L2VideoDevice::streamOff()\n \n \tqueuedBuffers_.clear();\n \tfdBufferNotifier_->setEnabled(false);\n-\tstreaming_ = false;\n+\tstate_ = State::Stopped;\n \n \treturn 0;\n }\n","prefixes":["libcamera-devel","v5","5/8"]}