3 files changed, 51 insertions, 0 deletions
diff --git a/include/libcamera/camera.h b/include/libcamera/camera.h
index ef6a37bb..2fd5870b 100644
--- a/include/libcamera/camera.h
+++ b/include/libcamera/camera.h
@@ -20,6 +20,7 @@
 namespace libcamera {
 
 class Buffer;
+class FrameBufferAllocator;
 class PipelineHandler;
 class Request;
 
@@ -126,6 +127,10 @@ private:
 
 	bool disconnected_;
 	State state_;
+
+	/* Needed to update allocator_ and to read state_ and activeStreams_. */
+	friend class FrameBufferAllocator;
+	FrameBufferAllocator *allocator_;
 };
 
 } /* namespace libcamera */
diff --git a/include/libcamera/framebuffer_allocator.h b/include/libcamera/framebuffer_allocator.h
new file mode 100644
index 00000000..42812253
--- /dev/null
+++ b/include/libcamera/framebuffer_allocator.h
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * framebuffer_allocator.h - FrameBuffer allocator
+ */
+#ifndef __LIBCAMERA_FRAMEBUFFER_ALLOCATOR_H__
+#define __LIBCAMERA_FRAMEBUFFER_ALLOCATOR_H__
+
+#include <map>
+#include <memory>
+#include <vector>
+
+namespace libcamera {
+
+class Camera;
+class FrameBuffer;
+class Stream;
+
+class FrameBufferAllocator
+{
+public:
+	static FrameBufferAllocator *create(std::shared_ptr<Camera> camera);
+
+	FrameBufferAllocator(const Camera &) = delete;
+	FrameBufferAllocator &operator=(const Camera &) = delete;
+
+	~FrameBufferAllocator();
+
+	int allocate(Stream *stream);
+	int free(Stream *stream);
+
+	bool allocated() const { return !buffers_.empty(); }
+	const std::vector<std::unique_ptr<FrameBuffer>> &buffers(Stream *stream) const;
+
+private:
+	FrameBufferAllocator(std::shared_ptr<Camera> camera);
+
+	std::shared_ptr<Camera> camera_;
+	std::map<Stream *, std::vector<std::unique_ptr<FrameBuffer>>> buffers_;
+};
+
+} /* namespace libcamera */
+
+#endif /* __LIBCAMERA_FRAMEBUFFER_ALLOCATOR_H__ */
diff --git a/include/libcamera/meson.build b/include/libcamera/meson.build
index 543e6773..8db217bb 100644
--- a/include/libcamera/meson.build
+++ b/include/libcamera/meson.build
@@ -7,6 +7,7 @@ libcamera_api = files([
     'event_dispatcher.h',
     'event_notifier.h',
     'file_descriptor.h',
+    'framebuffer_allocator.h',
     'geometry.h',
     'logging.h',
     'object.h',