[libcamera-devel] [PATCH v3 1/9] libcamera: pipeline: Introduce skeleton Virtual Pipeline

[Harvey Yang]

Provide all of the skeleton stubs to succesfully compile
and register the Virtual Pipeline Handler for testing with fake data.

Meson must be reconfigured to ensure that this pipeline handler is
included in the selected pipelines configuration.

Signed-off-by: Harvey Yang <chenghaoyang at chromium.org>
---
 meson_options.txt                          |   2 +-
 src/libcamera/pipeline/virtual/meson.build |   5 +
 src/libcamera/pipeline/virtual/virtual.cpp | 112 +++++++++++++++++++++
 3 files changed, 118 insertions(+), 1 deletion(-)
 create mode 100644 src/libcamera/pipeline/virtual/meson.build
 create mode 100644 src/libcamera/pipeline/virtual/virtual.cpp

diff --git a/meson_options.txt b/meson_options.txt
index 1ba6778c..08876f4c 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -37,7 +37,7 @@ option('lc-compliance',
 
 option('pipelines',
         type : 'array',
-        choices : ['imx8-isi', 'ipu3', 'raspberrypi', 'rkisp1', 'simple', 'uvcvideo', 'vimc'],
+        choices : ['imx8-isi', 'ipu3', 'raspberrypi', 'rkisp1', 'simple', 'uvcvideo', 'vimc', 'virtual'],
         description : 'Select which pipeline handlers to include')
 
 option('qcam',
diff --git a/src/libcamera/pipeline/virtual/meson.build b/src/libcamera/pipeline/virtual/meson.build
new file mode 100644
index 00000000..ba7ff754
--- /dev/null
+++ b/src/libcamera/pipeline/virtual/meson.build
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
+libcamera_sources += files([
+    'virtual.cpp',
+])
diff --git a/src/libcamera/pipeline/virtual/virtual.cpp b/src/libcamera/pipeline/virtual/virtual.cpp
new file mode 100644
index 00000000..09583b4e
--- /dev/null
+++ b/src/libcamera/pipeline/virtual/virtual.cpp
@@ -0,0 +1,112 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2022, Google Inc.
+ *
+ * fake.cpp - Pipeline handler for fake cameras
+ */
+
+#include <libcamera/base/log.h>
+
+#include <libcamera/camera.h>
+
+#include "libcamera/internal/pipeline_handler.h"
+
+namespace libcamera {
+
+LOG_DEFINE_CATEGORY(VIRTUAL)
+
+class VirtualCameraConfiguration : public CameraConfiguration
+{
+public:
+	VirtualCameraConfiguration();
+
+	Status validate() override;
+};
+
+class PipelineHandlerVirtual : public PipelineHandler
+{
+public:
+	PipelineHandlerVirtual(CameraManager *manager);
+
+	std::unique_ptr<CameraConfiguration> generateConfiguration(Camera *camera,
+								   const StreamRoles &roles) override;
+	int configure(Camera *camera, CameraConfiguration *config) override;
+
+	int exportFrameBuffers(Camera *camera, Stream *stream,
+			       std::vector<std::unique_ptr<FrameBuffer>> *buffers) override;
+
+	int start(Camera *camera, const ControlList *controls) override;
+	void stopDevice(Camera *camera) override;
+
+	int queueRequestDevice(Camera *camera, Request *request) override;
+
+	bool match(DeviceEnumerator *enumerator) override;
+};
+
+VirtualCameraConfiguration::VirtualCameraConfiguration()
+	: CameraConfiguration()
+{
+}
+
+CameraConfiguration::Status VirtualCameraConfiguration::validate()
+{
+	return Invalid;
+}
+
+PipelineHandlerVirtual::PipelineHandlerVirtual(CameraManager *manager)
+	: PipelineHandler(manager)
+{
+}
+
+std::unique_ptr<CameraConfiguration> PipelineHandlerVirtual::generateConfiguration(Camera *camera,
+										   const StreamRoles &roles)
+{
+	(void)camera;
+	(void)roles;
+	return std::unique_ptr<VirtualCameraConfiguration>(nullptr);
+}
+
+int PipelineHandlerVirtual::configure(Camera *camera, CameraConfiguration *config)
+{
+	(void)camera;
+	(void)config;
+	return -1;
+}
+
+int PipelineHandlerVirtual::exportFrameBuffers(Camera *camera, Stream *stream,
+					       std::vector<std::unique_ptr<FrameBuffer>> *buffers)
+{
+	(void)camera;
+	(void)stream;
+	(void)buffers;
+	return -1;
+}
+
+int PipelineHandlerVirtual::start(Camera *camera, const ControlList *controls)
+{
+	(void)camera;
+	(void)controls;
+	return -1;
+}
+
+void PipelineHandlerVirtual::stopDevice(Camera *camera)
+{
+	(void)camera;
+}
+
+int PipelineHandlerVirtual::queueRequestDevice(Camera *camera, Request *request)
+{
+	(void)camera;
+	(void)request;
+	return -1;
+}
+
+bool PipelineHandlerVirtual::match(DeviceEnumerator *enumerator)
+{
+	(void)enumerator;
+	return false;
+}
+
+REGISTER_PIPELINE_HANDLER(PipelineHandlerVirtual)
+
+} /* namespace libcamera */
-- 
2.39.0.314.g84b9a713c41-goog