gst: Add a pool and an allocator implementation

This is needed to track the lifetime of the FrameBufferAllocator in relation to
the GstBuffer/GstMemory objects travelling inside GStreamer.

Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/src/gstreamer/gstlibcameraallocator.h b/src/gstreamer/gstlibcameraallocator.h
new file mode 100644
index 00000000..b3f7f367
--- /dev/null
+++ b/src/gstreamer/gstlibcameraallocator.h
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2020, Collabora Ltd.
+ *     Author: Nicolas Dufresne <nicolas.dufresne@collabora.com>
+ *
+ * gstlibcameraallocator.h - GStreamer Custom Allocator
+ */
+
+#ifndef __GST_LIBCAMERA_ALLOCATOR_H__
+#define __GST_LIBCAMERA_ALLOCATOR_H__
+
+#include <gst/gst.h>
+#include <gst/allocators/allocators.h>
+
+#include <libcamera/stream.h>
+
+#define GST_TYPE_LIBCAMERA_ALLOCATOR gst_libcamera_allocator_get_type()
+G_DECLARE_FINAL_TYPE(GstLibcameraAllocator, gst_libcamera_allocator,
+		     GST_LIBCAMERA, ALLOCATOR, GstDmaBufAllocator)
+
+GstLibcameraAllocator *gst_libcamera_allocator_new(std::shared_ptr<libcamera::Camera> camera);
+
+bool gst_libcamera_allocator_prepare_buffer(GstLibcameraAllocator *self,
+					    libcamera::Stream *stream,
+					    GstBuffer *buffer);
+
+gsize gst_libcamera_allocator_get_pool_size(GstLibcameraAllocator *allocator,
+					    libcamera::Stream *stream);
+
+#endif /* __GST_LIBCAMERA_ALLOCATOR_H__ */