{"id":2892,"url":"https://patchwork.libcamera.org/api/patches/2892/?format=json","web_url":"https://patchwork.libcamera.org/patch/2892/","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":"<20200227200407.490616-11-nicolas.dufresne@collabora.com>","date":"2020-02-27T20:03:50","name":"[libcamera-devel,v2,10/27] gst: libcamerasrc: Add a task for the streaming thread","commit_ref":null,"pull_url":null,"state":"accepted","archived":false,"hash":"8c205a7f8862298fc8eb3502b29ff9d070de6122","submitter":{"id":31,"url":"https://patchwork.libcamera.org/api/people/31/?format=json","name":"Nicolas Dufresne","email":"nicolas.dufresne@collabora.com"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/2892/mbox/","series":[{"id":693,"url":"https://patchwork.libcamera.org/api/series/693/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=693","date":"2020-02-27T20:03:40","name":"GStreamer Element for libcamera","version":2,"mbox":"https://patchwork.libcamera.org/series/693/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/2892/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/2892/checks/","tags":{},"headers":{"Return-Path":"","Received":["from bhuna.collabora.co.uk (bhuna.collabora.co.uk\n\t[IPv6:2a00:1098:0:82:1000:25:2eeb:e3e3])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 8F7926271D\n\tfor ;\n\tThu, 27 Feb 2020 21:04:22 +0100 (CET)","from [127.0.0.1] (localhost [127.0.0.1])\n\t(Authenticated sender: nicolas) with ESMTPSA id 127EF29654F"],"From":"Nicolas Dufresne ","To":"libcamera-devel@lists.libcamera.org","Date":"Thu, 27 Feb 2020 15:03:50 -0500","Message-Id":"<20200227200407.490616-11-nicolas.dufresne@collabora.com>","X-Mailer":"git-send-email 2.24.1","In-Reply-To":"<20200227200407.490616-1-nicolas.dufresne@collabora.com>","References":"<20200227200407.490616-1-nicolas.dufresne@collabora.com>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","Subject":"[libcamera-devel] [PATCH v2 10/27] gst: libcamerasrc: Add a task\n\tfor the streaming thread","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","X-List-Received-Date":"Thu, 27 Feb 2020 20:04:23 -0000"},"content":"Use a GstTask as our internal streaming thread. Unlike GstBaseSrc, we\nwill be running a streaming thread at the element level rather than\nper pad. This is needed to combine buffer request for multiple pads.\n\nSigned-off-by: Nicolas Dufresne \n---\n src/gstreamer/gstlibcamerasrc.cpp | 49 +++++++++++++++++++++++++++++++\n 1 file changed, 49 insertions(+)","diff":"diff --git a/src/gstreamer/gstlibcamerasrc.cpp b/src/gstreamer/gstlibcamerasrc.cpp\nindex 0c60478..53ece26 100644\n--- a/src/gstreamer/gstlibcamerasrc.cpp\n+++ b/src/gstreamer/gstlibcamerasrc.cpp\n@@ -26,7 +26,11 @@ struct GstLibcameraSrcState {\n \n struct _GstLibcameraSrc {\n \tGstElement parent;\n+\n+\tGRecMutex stream_lock;\n+\tGstTask *task;\n \tGstPad *srcpad;\n+\n \tgchar *camera_name;\n \n \tGstLibcameraSrcState *state;\n@@ -112,6 +116,30 @@ gst_libcamera_src_open(GstLibcameraSrc *self)\n \treturn true;\n }\n \n+static void\n+gst_libcamera_src_task_run(gpointer user_data)\n+{\n+\tGstLibcameraSrc *self = GST_LIBCAMERA_SRC(user_data);\n+\n+\tGST_DEBUG_OBJECT(self, \"Streaming thread is now capturing\");\n+}\n+\n+static void\n+gst_libcamera_src_task_enter(GstTask *task, GThread *thread, gpointer user_data)\n+{\n+\tGstLibcameraSrc *self = GST_LIBCAMERA_SRC(user_data);\n+\n+\tGST_DEBUG_OBJECT(self, \"Streaming thread has started\");\n+}\n+\n+static void\n+gst_libcamera_src_task_leave(GstTask *task, GThread *thread, gpointer user_data)\n+{\n+\tGstLibcameraSrc *self = GST_LIBCAMERA_SRC(user_data);\n+\n+\tGST_DEBUG_OBJECT(self, \"Streaming thread is about to stop\");\n+}\n+\n static void\n gst_libcamera_src_close(GstLibcameraSrc *self)\n {\n@@ -182,9 +210,22 @@ gst_libcamera_src_change_state(GstElement *element, GstStateChange transition)\n \t\t\treturn GST_STATE_CHANGE_FAILURE;\n \t\tbreak;\n \tcase GST_STATE_CHANGE_READY_TO_PAUSED:\n+\t\t/* This needs to be called after pads activation.*/\n+\t\tif (!gst_task_pause(self->task))\n+\t\t\treturn GST_STATE_CHANGE_FAILURE;\n+\t\tret = GST_STATE_CHANGE_NO_PREROLL;\n+\t\tbreak;\n \tcase GST_STATE_CHANGE_PLAYING_TO_PAUSED:\n \t\tret = GST_STATE_CHANGE_NO_PREROLL;\n \t\tbreak;\n+\tcase GST_STATE_CHANGE_PAUSED_TO_READY:\n+\t\t/* \\todo this might requires some thread unblocking in the future\n+\t\t * if the streaming thread starts doing any kind of blocking\n+\t\t * operations. If this was the case, we would need to do so\n+\t\t * before pad deactivation, so before chaining to the parent\n+\t\t * change_state function. */\n+\t\tgst_task_join(self->task);\n+\t\tbreak;\n \tcase GST_STATE_CHANGE_READY_TO_NULL:\n \t\tgst_libcamera_src_close(self);\n \t\tbreak;\n@@ -201,6 +242,8 @@ gst_libcamera_src_finalize(GObject *object)\n \tGObjectClass *klass = G_OBJECT_CLASS(gst_libcamera_src_parent_class);\n \tGstLibcameraSrc *self = GST_LIBCAMERA_SRC(object);\n \n+\tg_rec_mutex_clear(&self->stream_lock);\n+\tg_clear_object(&self->task);\n \tg_free(self->camera_name);\n \tdelete self->state;\n \n@@ -213,6 +256,12 @@ gst_libcamera_src_init(GstLibcameraSrc *self)\n \tGstLibcameraSrcState *state = new GstLibcameraSrcState();\n \tGstPadTemplate *templ = gst_element_get_pad_template(GST_ELEMENT(self), \"src\");\n \n+\tg_rec_mutex_init(&self->stream_lock);\n+\tself->task = gst_task_new(gst_libcamera_src_task_run, self, nullptr);\n+\tgst_task_set_enter_callback(self->task, gst_libcamera_src_task_enter, self, nullptr);\n+\tgst_task_set_leave_callback(self->task, gst_libcamera_src_task_leave, self, nullptr);\n+\tgst_task_set_lock(self->task, &self->stream_lock);\n+\n \tself->srcpad = gst_pad_new_from_template(templ, \"src\");\n \tgst_element_add_pad(GST_ELEMENT(self), self->srcpad);\n \tself->state = state;\n","prefixes":["libcamera-devel","v2","10/27"]}