[{"id":4243,"web_url":"https://patchwork.libcamera.org/comment/4243/","msgid":"<504200f2-4cc0-afb2-9d57-afc4b2ef668e@ideasonboard.com>","date":"2020-03-23T17:46:01","subject":"Re: [libcamera-devel] [PATCH v2 05/21] qcam: main_window: Move\n\tcapture event processing to main thread","submitter":{"id":4,"url":"https://patchwork.libcamera.org/api/people/4/","name":"Kieran Bingham","email":"kieran.bingham@ideasonboard.com"},"content":"On 23/03/2020 17:35, Laurent Pinchart wrote:\n> To avoid blocking the camera manager for a long amount of time, move\n> capture event processing to the main thread. Captured buffers are added\n> to a queue and an event is posted to the main window to signal\n> availability of a buffer.\n> \n> Signed-off-by: Laurent Pinchart \n\nI believe I added this to v1:\n\nReviewed-by: Kieran Bingham \n\n> ---\n> Changes since v1:\n> \n> - Add blank line\n> ---\n> src/qcam/main_window.cpp | 55 +++++++++++++++++++++++++++++++++++++++-\n> src/qcam/main_window.h | 8 ++++++\n> 2 files changed, 62 insertions(+), 1 deletion(-)\n> \n> diff --git a/src/qcam/main_window.cpp b/src/qcam/main_window.cpp\n> index 354a53367d0f..805690d5006a 100644\n> --- a/src/qcam/main_window.cpp\n> +++ b/src/qcam/main_window.cpp\n> @@ -19,6 +19,7 @@\n> #include \n> #include \n> #include \n> +#include \n> #include \n> #include \n> #include \n> @@ -31,6 +32,21 @@\n> \n> using namespace libcamera;\n> \n> +class CaptureEvent : public QEvent\n> +{\n> +public:\n> +\tCaptureEvent()\n> +\t\t: QEvent(type())\n> +\t{\n> +\t}\n> +\n> +\tstatic Type type()\n> +\t{\n> +\t\tstatic int type = QEvent::registerEventType();\n> +\t\treturn static_cast(type);\n> +\t}\n> +};\n> +\n> MainWindow::MainWindow(CameraManager *cm, const OptionsParser::Options &options)\n> \t: options_(options), cm_(cm), allocator_(nullptr), isCapturing_(false)\n> {\n> @@ -63,6 +79,16 @@ MainWindow::~MainWindow()\n> \t}\n> }\n> \n> +bool MainWindow::event(QEvent *e)\n> +{\n> +\tif (e->type() == CaptureEvent::type()) {\n> +\t\tprocessCapture();\n> +\t\treturn true;\n> +\t}\n> +\n> +\treturn QMainWindow::event(e);\n> +}\n> +\n> int MainWindow::createToolbars()\n> {\n> \tQAction *action;\n> @@ -343,6 +369,13 @@ void MainWindow::stopCapture()\n> \n> \tconfig_.reset();\n> \n> +\t/*\n> +\t * A CaptureEvent may have been posted before we stopped the camera,\n> +\t * but not processed yet. Clear the queue of done buffers to avoid\n> +\t * racing with the event handler.\n> +\t */\n> +\tdoneQueue_.clear();\n> +\n> \ttitleTimer_.stop();\n> \tsetWindowTitle(title_);\n> }\n> @@ -371,10 +404,30 @@ void MainWindow::requestComplete(Request *request)\n> \t\treturn;\n> \n> \tconst std::map &buffers = request->buffers();\n> +\tFrameBuffer *buffer = buffers.begin()->second;\n> +\n> +\t{\n> +\t\tQMutexLocker locker(&mutex_);\n> +\t\tdoneQueue_.enqueue(buffer);\n> +\t}\n> +\n> +\tQCoreApplication::postEvent(this, new CaptureEvent);\n> +}\n> +\n> +void MainWindow::processCapture()\n> +{\n> +\tFrameBuffer *buffer;\n> +\n> +\t{\n> +\t\tQMutexLocker locker(&mutex_);\n> +\t\tif (doneQueue_.isEmpty())\n> +\t\t\treturn;\n> +\n> +\t\tbuffer = doneQueue_.dequeue();\n> +\t}\n> \n> \tframesCaptured_++;\n> \n> -\tFrameBuffer *buffer = buffers.begin()->second;\n> \tconst FrameMetadata &metadata = buffer->metadata();\n> \n> \tdouble fps = metadata.timestamp - lastBufferTime_;\n> diff --git a/src/qcam/main_window.h b/src/qcam/main_window.h\n> index 720a3393e3dc..c623120d5894 100644\n> --- a/src/qcam/main_window.h\n> +++ b/src/qcam/main_window.h\n> @@ -11,7 +11,9 @@\n> \n> #include \n> #include \n> +#include \n> #include \n> +#include \n> #include \n> \n> #include \n> @@ -40,6 +42,8 @@ public:\n> \tMainWindow(CameraManager *cm, const OptionsParser::Options &options);\n> \t~MainWindow();\n> \n> +\tbool event(QEvent *e) override;\n> +\n> private Q_SLOTS:\n> \tvoid quit();\n> \tvoid updateTitle();\n> @@ -57,6 +61,7 @@ private:\n> \tint openCamera();\n> \n> \tvoid requestComplete(Request *request);\n> +\tvoid processCapture();\n> \tint display(FrameBuffer *buffer);\n> \tvoid queueRequest(FrameBuffer *buffer);\n> \n> @@ -78,6 +83,9 @@ private:\n> \tuint32_t previousFrames_;\n> \tuint32_t framesCaptured_;\n> \n> +\tQMutex mutex_;\n> +\tQQueue doneQueue_;\n> +\n> \tQToolBar *toolbar_;\n> \tViewFinder *viewfinder_;\n> \tstd::map> mappedBuffers_;\n>","headers":{"Return-Path":"","Received":["from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 0D6F560429\n\tfor ;\n\tMon, 23 Mar 2020 18:46:05 +0100 (CET)","from [192.168.0.20]\n\t(cpc89242-aztw30-2-0-cust488.18-1.cable.virginm.net [86.31.129.233])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 7D547308;\n\tMon, 23 Mar 2020 18:46:04 +0100 (CET)"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1584985564;\n\tbh=ZEwRzsEah34uHYfSNLPXb9gEhJj2QpPGmk1nskAf9BM=;\n\th=Reply-To:Subject:To:References:From:Date:In-Reply-To:From;\n\tb=MzAyosBInAIKRwNbJrWx6/Nmx+TFRVu1IFv/Xq9OYQa4zmRIuNqMvEbU3dVg1QoAq\n\t+YQdZYWyc7SNSP5txHSTa7yK3sQjf1EFLrXhREnbrDg/pVMlLHOMcmlnovrpu73Sfv\n\tboteaf9MHp7WZ0iJfNVQsePs4IE/yVzu72o8aL+g=","Reply-To":"kieran.bingham@ideasonboard.com","To":"Laurent Pinchart ,\n\tlibcamera-devel@lists.libcamera.org","References":"<20200323173559.21109-1-laurent.pinchart@ideasonboard.com>\n\t<20200323173559.21109-6-laurent.pinchart@ideasonboard.com>","From":"Kieran Bingham ","Openpgp":"preference=signencrypt","Autocrypt":"addr=kieran.bingham@ideasonboard.com; keydata=\n\tmQINBFYE/WYBEACs1PwjMD9rgCu1hlIiUA1AXR4rv2v+BCLUq//vrX5S5bjzxKAryRf0uHat\n\tV/zwz6hiDrZuHUACDB7X8OaQcwhLaVlq6byfoBr25+hbZG7G3+5EUl9cQ7dQEdvNj6V6y/SC\n\trRanWfelwQThCHckbobWiQJfK9n7rYNcPMq9B8e9F020LFH7Kj6YmO95ewJGgLm+idg1Kb3C\n\tpotzWkXc1xmPzcQ1fvQMOfMwdS+4SNw4rY9f07Xb2K99rjMwZVDgESKIzhsDB5GY465sCsiQ\n\tcSAZRxqE49RTBq2+EQsbrQpIc8XiffAB8qexh5/QPzCmR4kJgCGeHIXBtgRj+nIkCJPZvZtf\n\tKr2EAbc6tgg6DkAEHJb+1okosV09+0+TXywYvtEop/WUOWQ+zo+Y/OBd+8Ptgt1pDRyOBzL8\n\tRXa8ZqRf0Mwg75D+dKntZeJHzPRJyrlfQokngAAs4PaFt6UfS+ypMAF37T6CeDArQC41V3ko\n\tlPn1yMsVD0p+6i3DPvA/GPIksDC4owjnzVX9kM8Zc5Cx+XoAN0w5Eqo4t6qEVbuettxx55gq\n\t8K8FieAjgjMSxngo/HST8TpFeqI5nVeq0/lqtBRQKumuIqDg+Bkr4L1V/PSB6XgQcOdhtd36\n\tOe9X9dXB8YSNt7VjOcO7BTmFn/Z8r92mSAfHXpb07YJWJosQOQARAQABtDBLaWVyYW4gQmlu\n\tZ2hhbSA8a2llcmFuLmJpbmdoYW1AaWRlYXNvbmJvYXJkLmNvbT6JAlcEEwEKAEECGwMFCwkI\n\tBwIGFQgJCgsCBBYCAwECHgECF4ACGQEWIQSQLdeYP70o/eNy1HqhHkZyEKRh/QUCXWTtygUJ\n\tCyJXZAAKCRChHkZyEKRh/f8dEACTDsbLN2nioNZMwyLuQRUAFcXNolDX48xcUXsWS2QjxaPm\n\tVsJx8Uy8aYkS85mdPBh0C83OovQR/OVbr8AxhGvYqBs3nQvbWuTl/+4od7DfK2VZOoKBAu5S\n\tQK2FYuUcikDqYcFWJ8DQnubxfE8dvzojHEkXw0sA4igINHDDFX3HJGZtLio+WpEFQtCbfTAG\n\tYZslasz1YZRbwEdSsmO3/kqy5eMnczlm8a21A3fKUo3g8oAZEFM+f4DUNzqIltg31OAB/kZS\n\tenKZQ/SWC8PmLg/ZXBrReYakxXtkP6w3FwMlzOlhGxqhIRNiAJfXJBaRhuUWzPOpEDE9q5YJ\n\tBmqQL2WJm1VSNNVxbXJHpaWMH1sA2R00vmvRrPXGwyIO0IPYeUYQa3gsy6k+En/aMQJd27dp\n\taScf9am9PFICPY5T4ppneeJLif2lyLojo0mcHOV+uyrds9XkLpp14GfTkeKPdPMrLLTsHRfH\n\tfA4I4OBpRrEPiGIZB/0im98MkGY/Mu6qxeZmYLCcgD6qz4idOvfgVOrNh+aA8HzIVR+RMW8H\n\tQGBN9f0E3kfwxuhl3omo6V7lDw8XOdmuWZNC9zPq1UfryVHANYbLGz9KJ4Aw6M+OgBC2JpkD\n\thXMdHUkC+d20dwXrwHTlrJi1YNp6rBc+xald3wsUPOZ5z8moTHUX/uPA/qhGsbkCDQRWBP1m\n\tARAAzijkb+Sau4hAncr1JjOY+KyFEdUNxRy+hqTJdJfaYihxyaj0Ee0P0zEi35CbE6lgU0Uz\n\ttih9fiUbSV3wfsWqg1Ut3/5rTKu7kLFp15kF7eqvV4uezXRD3Qu4yjv/rMmEJbbD4cTvGCYI\n\td6MDC417f7vK3hCbCVIZSp3GXxyC1LU+UQr3fFcOyCwmP9vDUR9JV0BSqHHxRDdpUXE26Dk6\n\tmhf0V1YkspE5St814ETXpEus2urZE5yJIUROlWPIL+hm3NEWfAP06vsQUyLvr/GtbOT79vXl\n\tEn1aulcYyu20dRRxhkQ6iILaURcxIAVJJKPi8dsoMnS8pB0QW12AHWuirPF0g6DiuUfPmrA5\n\tPKe56IGlpkjc8cO51lIxHkWTpCMWigRdPDexKX+Sb+W9QWK/0JjIc4t3KBaiG8O4yRX8ml2R\n\t+rxfAVKM6V769P/hWoRGdgUMgYHFpHGSgEt80OKK5HeUPy2cngDUXzwrqiM5Sz6Od0qw5pCk\n\tNlXqI0W/who0iSVM+8+RmyY0OEkxEcci7rRLsGnM15B5PjLJjh1f2ULYkv8s4SnDwMZ/kE04\n\t/UqCMK/KnX8pwXEMCjz0h6qWNpGwJ0/tYIgQJZh6bqkvBrDogAvuhf60Sogw+mH8b+PBlx1L\n\toeTK396wc+4c3BfiC6pNtUS5GpsPMMjYMk7kVvEAEQEAAYkCPAQYAQoAJgIbDBYhBJAt15g/\n\tvSj943LUeqEeRnIQpGH9BQJdizzIBQkLSKZiAAoJEKEeRnIQpGH9eYgQAJpjaWNgqNOnMTmD\n\tMJggbwjIotypzIXfhHNCeTkG7+qCDlSaBPclcPGYrTwCt0YWPU2TgGgJrVhYT20ierN8LUvj\n\t6qOPTd+Uk7NFzL65qkh80ZKNBFddx1AabQpSVQKbdcLb8OFs85kuSvFdgqZwgxA1vl4TFhNz\n\tPZ79NAmXLackAx3sOVFhk4WQaKRshCB7cSl+RIng5S/ThOBlwNlcKG7j7W2MC06BlTbdEkUp\n\tECzuuRBv8wX4OQl+hbWbB/VKIx5HKlLu1eypen/5lNVzSqMMIYkkZcjV2SWQyUGxSwq0O/sx\n\tS0A8/atCHUXOboUsn54qdxrVDaK+6jIAuo8JiRWctP16KjzUM7MO0/+4zllM8EY57rXrj48j\n\tsbEYX0YQnzaj+jO6kJtoZsIaYR7rMMq9aUAjyiaEZpmP1qF/2sYenDx0Fg2BSlLvLvXM0vU8\n\tpQk3kgDu7kb/7PRYrZvBsr21EIQoIjXbZxDz/o7z95frkP71EaICttZ6k9q5oxxA5WC6sTXc\n\tMW8zs8avFNuA9VpXt0YupJd2ijtZy2mpZNG02fFVXhIn4G807G7+9mhuC4XG5rKlBBUXTvPU\n\tAfYnB4JBDLmLzBFavQfvonSfbitgXwCG3vS+9HEwAjU30Bar1PEOmIbiAoMzuKeRm2LVpmq4\n\tWZw01QYHU/GUV/zHJSFk","Organization":"Ideas on Board","Message-ID":"<504200f2-4cc0-afb2-9d57-afc4b2ef668e@ideasonboard.com>","Date":"Mon, 23 Mar 2020 17:46:01 +0000","User-Agent":"Mozilla/5.0 (X11; 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