{"id":24238,"url":"https://patchwork.libcamera.org/api/1.1/patches/24238/?format=json","web_url":"https://patchwork.libcamera.org/patch/24238/","project":{"id":1,"url":"https://patchwork.libcamera.org/api/1.1/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":"<20250827090739.86955-2-david.plowman@raspberrypi.com>","date":"2025-08-27T09:07:28","name":"[RFC,01/12] libcamera: Infrastructure to ask for \"memory\" cameras","commit_ref":null,"pull_url":null,"state":"superseded","archived":false,"hash":"9889b22d710ae19cbefc80118734f5c19fa7f6cd","submitter":{"id":42,"url":"https://patchwork.libcamera.org/api/1.1/people/42/?format=json","name":"David Plowman","email":"david.plowman@raspberrypi.com"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/24238/mbox/","series":[{"id":5407,"url":"https://patchwork.libcamera.org/api/1.1/series/5407/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=5407","date":"2025-08-27T09:07:27","name":"Bayer Re-Processing","version":1,"mbox":"https://patchwork.libcamera.org/series/5407/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/24238/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/24238/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 A3584BD87C\n\tfor ;\n\tWed, 27 Aug 2025 09:07:53 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 3F6B9692EE;\n\tWed, 27 Aug 2025 11:07:48 +0200 (CEST)","from mail-wr1-x434.google.com (mail-wr1-x434.google.com\n\t[IPv6:2a00:1450:4864:20::434])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id C85CA613C0\n\tfor ;\n\tWed, 27 Aug 2025 11:07:44 +0200 (CEST)","by mail-wr1-x434.google.com with SMTP id\n\tffacd0b85a97d-3c73d3ebff0so293571f8f.1\n\tfor ;\n\tWed, 27 Aug 2025 02:07:44 -0700 (PDT)","from raspberrypi.pitowers.org\n\t([2a00:1098:3142:1f:ffc9:aff6:7f7f:893b])\n\tby smtp.gmail.com with ESMTPSA id\n\t5b1f17b1804b1-45b6f30fe02sm21498675e9.18.2025.08.27.02.07.43\n\t(version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);\n\tWed, 27 Aug 2025 02:07:43 -0700 (PDT)"],"Authentication-Results":"lancelot.ideasonboard.com; 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\n\tWed, 27 Aug 2025 02:07:43 -0700 (PDT)","From":"David Plowman ","To":"libcamera-devel@lists.libcamera.org","Cc":"David Plowman ","Subject":"[RFC PATCH 01/12] libcamera: Infrastructure to ask for \"memory\"\n\tcameras","Date":"Wed, 27 Aug 2025 10:07:28 +0100","Message-Id":"<20250827090739.86955-2-david.plowman@raspberrypi.com>","X-Mailer":"git-send-email 2.39.5","In-Reply-To":"<20250827090739.86955-1-david.plowman@raspberrypi.com>","References":"<20250827090739.86955-1-david.plowman@raspberrypi.com>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","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":"Signed-off-by: David Plowman \n---\n include/libcamera/camera_manager.h | 4 ++\n include/libcamera/internal/camera_manager.h | 5 +++\n include/libcamera/internal/pipeline_handler.h | 8 ++++\n src/libcamera/camera_manager.cpp | 40 +++++++++++++++++++\n 4 files changed, 57 insertions(+)","diff":"diff --git a/include/libcamera/camera_manager.h b/include/libcamera/camera_manager.h\nindex 27835500..436db409 100644\n--- a/include/libcamera/camera_manager.h\n+++ b/include/libcamera/camera_manager.h\n@@ -7,6 +7,7 @@\n \n #pragma once\n \n+#include \n #include \n #include \n #include \n@@ -20,6 +21,7 @@\n namespace libcamera {\n \n class Camera;\n+class PipelineHandler;\n \n class CameraManager : public Object, public Extensible\n {\n@@ -33,6 +35,8 @@ public:\n \n \tstd::vector> cameras() const;\n \tstd::shared_ptr get(std::string_view id);\n+\tstd::vector memoryCameras() const;\n+\tstd::shared_ptr getMemoryCamera(std::string_view id, std::string_view settings);\n \n \tstatic const std::string &version() { return version_; }\n \ndiff --git a/include/libcamera/internal/camera_manager.h b/include/libcamera/internal/camera_manager.h\nindex 0150ca61..a490cb25 100644\n--- a/include/libcamera/internal/camera_manager.h\n+++ b/include/libcamera/internal/camera_manager.h\n@@ -49,6 +49,9 @@ private:\n \tvoid pipelineFactoryMatch(const PipelineHandlerFactoryBase *factory);\n \tvoid cleanup() LIBCAMERA_TSA_EXCLUDES(mutex_);\n \n+\tstd::shared_ptr getMemoryCamera(const PipelineHandlerFactoryBase *factory,\n+\t\t\t\t\t\tstd::string_view settings);\n+\n \t/*\n \t * This mutex protects\n \t *\n@@ -64,6 +67,8 @@ private:\n \n \tstd::unique_ptr enumerator_;\n \n+\tstd::vector memoryCameras_;\n+\n \tstd::unique_ptr ipaManager_;\n \tProcessManager processManager_;\n };\ndiff --git a/include/libcamera/internal/pipeline_handler.h b/include/libcamera/internal/pipeline_handler.h\nindex e89d6a33..0210d48b 100644\n--- a/include/libcamera/internal/pipeline_handler.h\n+++ b/include/libcamera/internal/pipeline_handler.h\n@@ -70,6 +70,14 @@ public:\n \n \tCameraManager *cameraManager() const { return manager_; }\n \n+\tvirtual bool supportsMemoryCamera() { return false; }\n+\n+\tvirtual std::shared_ptr createMemoryCamera([[maybe_unused]] DeviceEnumerator *enumerator,\n+\t\t\t\t\t\t\t [[maybe_unused]] std::string_view settings)\n+\t{\n+\t\treturn nullptr;\n+\t}\n+\n protected:\n \tvoid registerCamera(std::shared_ptr camera);\n \tvoid hotplugMediaDevice(MediaDevice *media);\ndiff --git a/src/libcamera/camera_manager.cpp b/src/libcamera/camera_manager.cpp\nindex f81794bf..580c31bf 100644\n--- a/src/libcamera/camera_manager.cpp\n+++ b/src/libcamera/camera_manager.cpp\n@@ -152,6 +152,13 @@ void CameraManager::Private::pipelineFactoryMatch(const PipelineHandlerFactoryBa\n {\n \tCameraManager *const o = LIBCAMERA_O_PTR();\n \n+\t/* First check for any memory-to-memory camera pipelines. */\n+\t{\n+\t\tstd::shared_ptr pipe = factory->create(o);\n+\t\tif (pipe->supportsMemoryCamera())\n+\t\t\tmemoryCameras_.push_back(std::string(pipe->name()));\n+\t}\n+\n \t/* Provide as many matching pipelines as possible. */\n \twhile (1) {\n \t\tstd::shared_ptr pipe = factory->create(o);\n@@ -164,6 +171,19 @@ void CameraManager::Private::pipelineFactoryMatch(const PipelineHandlerFactoryBa\n \t}\n }\n \n+std::shared_ptr CameraManager::Private::getMemoryCamera(const PipelineHandlerFactoryBase *factory,\n+\t\t\t\t\t\t\t\tstd::string_view settings)\n+{\n+\tCameraManager *const o = LIBCAMERA_O_PTR();\n+\n+\tstd::shared_ptr pipe = factory->create(o);\n+\n+\tpipe->moveToThread(this);\n+\n+\treturn pipe->invokeMethod(&PipelineHandler::createMemoryCamera,\n+\t\t\t\t ConnectionTypeBlocking, enumerator_.get(), settings);\n+}\n+\n void CameraManager::Private::cleanup()\n {\n \tenumerator_->devicesAdded.disconnect(this);\n@@ -399,6 +419,26 @@ std::shared_ptr CameraManager::get(std::string_view id)\n \treturn nullptr;\n }\n \n+std::vector CameraManager::memoryCameras() const\n+{\n+\treturn _d()->memoryCameras_;\n+}\n+\n+std::shared_ptr CameraManager::getMemoryCamera(std::string_view id,\n+\t\t\t\t\t\t std::string_view settings)\n+{\n+\tfor (const auto &name : _d()->memoryCameras_) {\n+\t\tif (name == id) {\n+\t\t\tconst PipelineHandlerFactoryBase *factory;\n+\t\t\tfactory = PipelineHandlerFactoryBase::getFactoryByName(name);\n+\n+\t\t\treturn _d()->getMemoryCamera(factory, settings);\n+\t\t}\n+\t}\n+\n+\treturn nullptr;\n+}\n+\n /**\n * \\var CameraManager::cameraAdded\n * \\brief Notify of a new camera added to the system\n","prefixes":["RFC","01/12"]}