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{ "id": 10849, "url": "https://patchwork.libcamera.org/api/1.1/patches/10849/?format=api", "web_url": "https://patchwork.libcamera.org/patch/10849/", "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": "<20210112045140.10979-2-email@uajain.com>", "date": "2021-01-12T04:51:39", "name": "[libcamera-devel,v2,1/2] libcamera: v4l2_videodevice: Track streaming state", "commit_ref": "c0bad607ce16ea66aa9c4de892598793402281c6", "pull_url": null, "state": "accepted", "archived": false, "hash": "ea7914dce356763ad91a53acf3573826b58a3f2f", "submitter": { "id": 1, "url": "https://patchwork.libcamera.org/api/1.1/people/1/?format=api", "name": "Umang Jain", "email": "email@uajain.com" }, "delegate": { "id": 12, "url": "https://patchwork.libcamera.org/api/1.1/users/12/?format=api", "username": "uajain", "first_name": "Umang", "last_name": "Jain", "email": "umang.jain@ideasonboard.com" }, "mbox": "https://patchwork.libcamera.org/patch/10849/mbox/", "series": [ { "id": 1575, "url": "https://patchwork.libcamera.org/api/1.1/series/1575/?format=api", "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=1575", "date": "2021-01-12T04:51:38", "name": "Simplify error paths", "version": 2, "mbox": "https://patchwork.libcamera.org/series/1575/mbox/" } ], "comments": "https://patchwork.libcamera.org/api/patches/10849/comments/", "check": "pending", "checks": "https://patchwork.libcamera.org/api/patches/10849/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 05E90BD80C\n\tfor <parsemail@patchwork.libcamera.org>;\n\tTue, 12 Jan 2021 04:51:50 +0000 (UTC)", "from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id C2ABD680C8;\n\tTue, 12 Jan 2021 05:51:49 +0100 (CET)", "from mail.uajain.com (static.126.159.217.95.clients.your-server.de\n\t[95.217.159.126])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 2D0C860523\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tTue, 12 Jan 2021 05:51:48 +0100 (CET)" ], "Authentication-Results": "lancelot.ideasonboard.com;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n\tunprotected) header.d=uajain.com header.i=@uajain.com\n\theader.b=\"iLr+3Wl6\"; dkim-atps=neutral", "From": "Umang Jain <email@uajain.com>", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=uajain.com; s=mail;\n\tt=1610427107; bh=UWgzg2JrMvee+s7TpRi3IE6dUgfl0XwSoy7hTz45BPM=;\n\th=From:To:Cc:Subject:In-Reply-To:References;\n\tb=iLr+3Wl647mP/+AcqFqrkJJkfYvbzgTlwSSH9G5y2Kw7OgkLr1MyHd64RCGTWHU3N\n\tra6daNwjqnNNWZ3M10OAkDpNrD9c+92ByCgV6HU18Yl9MDrat5whgvgFc2fkdSsl54\n\t0OrfzB5XP+HZEVpJ/L1PvobFI2vXwH8kJTe+IkW2p8Et/P5o1Q2YOJkn/G56KrP+jN\n\txqzpZBVarPzWBLOl9ooJrplfuW8mvdRnkMhdow9qIduj2/seCeZVfHpO2XFPJzsQhD\n\tV1TkC0+eyftM9K/Qv3Xy3SsAXaZx4ZYJ/vmdxYvzndKLMGjMfdfaRNklXLBPb+pTvy\n\tIEtkds2u3tZlw==", "To": "libcamera-devel@lists.libcamera.org", "Date": "Tue, 12 Jan 2021 10:21:39 +0530", "Message-Id": "<20210112045140.10979-2-email@uajain.com>", "In-Reply-To": "<20210112045140.10979-1-email@uajain.com>", "References": "<20210112045140.10979-1-email@uajain.com>", "Mime-Version": "1.0", "Subject": "[libcamera-devel] [PATCH v2 1/2] libcamera: v4l2_videodevice: Track\n\tstreaming state", "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>", "Content-Type": "text/plain; charset=\"us-ascii\"", "Content-Transfer-Encoding": "7bit", "Errors-To": "libcamera-devel-bounces@lists.libcamera.org", "Sender": "\"libcamera-devel\" <libcamera-devel-bounces@lists.libcamera.org>" }, "content": "From: Kieran Bingham <kieran.bingham@ideasonboard.com>\n\nTrack the state of streamon/streamoff calls to simplify error paths.\n\nEnsuring that streamOff() can be called on non-streaming streams\nfacilitates simpler error code paths, where a set of devices can all\ncall streamOff regardless of their initialisation state.\n\nSigned-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>\nSigned-off-by: Umang Jain <email@uajain.com>\nReviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>\n---\n include/libcamera/internal/v4l2_videodevice.h | 2 ++\n src/libcamera/v4l2_videodevice.cpp | 12 +++++++++++-\n 2 files changed, 13 insertions(+), 1 deletion(-)", "diff": "diff --git a/include/libcamera/internal/v4l2_videodevice.h b/include/libcamera/internal/v4l2_videodevice.h\nindex 529ca0e3..626dfbcd 100644\n--- a/include/libcamera/internal/v4l2_videodevice.h\n+++ b/include/libcamera/internal/v4l2_videodevice.h\n@@ -249,6 +249,8 @@ private:\n \tstd::map<unsigned int, FrameBuffer *> queuedBuffers_;\n \n \tEventNotifier *fdBufferNotifier_;\n+\n+\tbool streaming_;\n };\n \n class V4L2M2MDevice\ndiff --git a/src/libcamera/v4l2_videodevice.cpp b/src/libcamera/v4l2_videodevice.cpp\nindex baf683d6..a9509bff 100644\n--- a/src/libcamera/v4l2_videodevice.cpp\n+++ b/src/libcamera/v4l2_videodevice.cpp\n@@ -481,7 +481,8 @@ const std::string V4L2DeviceFormat::toString() const\n * \\param[in] deviceNode The file-system path to the video device node\n */\n V4L2VideoDevice::V4L2VideoDevice(const std::string &deviceNode)\n-\t: V4L2Device(deviceNode), cache_(nullptr), fdBufferNotifier_(nullptr)\n+\t: V4L2Device(deviceNode), cache_(nullptr), fdBufferNotifier_(nullptr),\n+\t streaming_(false)\n {\n \t/*\n \t * We default to an MMAP based CAPTURE video device, however this will\n@@ -1554,6 +1555,8 @@ int V4L2VideoDevice::streamOn()\n \t\treturn ret;\n \t}\n \n+\tstreaming_ = true;\n+\n \treturn 0;\n }\n \n@@ -1565,12 +1568,18 @@ int V4L2VideoDevice::streamOn()\n * and the bufferReady signal is emitted for them. The order in which those\n * buffers are dequeued is not specified.\n *\n+ * This will be a no-op if the stream is not started in the first place and\n+ * has no queued buffers.\n+ *\n * \\return 0 on success or a negative error code otherwise\n */\n int V4L2VideoDevice::streamOff()\n {\n \tint ret;\n \n+\tif (!streaming_ && queuedBuffers_.empty())\n+\t\treturn 0;\n+\n \tret = ioctl(VIDIOC_STREAMOFF, &bufferType_);\n \tif (ret < 0) {\n \t\tLOG(V4L2, Error)\n@@ -1588,6 +1597,7 @@ int V4L2VideoDevice::streamOff()\n \n \tqueuedBuffers_.clear();\n \tfdBufferNotifier_->setEnabled(false);\n+\tstreaming_ = false;\n \n \treturn 0;\n }\n", "prefixes": [ "libcamera-devel", "v2", "1/2" ] }