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diff --git a/source/blender/io/alembic/exporter/abc_archive.h b/source/blender/io/alembic/exporter/abc_archive.h
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+++ b/source/blender/io/alembic/exporter/abc_archive.h
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+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2020 Blender Foundation.
+ * All rights reserved.
+ */
+
+/** \file
+ * \ingroup Alembic
+ */
+
+#pragma once
+
+#include "ABC_alembic.h"
+#include "IO_abstract_hierarchy_iterator.h"
+
+#include <Alembic/Abc/OArchive.h>
+#include <Alembic/Abc/OTypedScalarProperty.h>
+
+#include <fstream>
+#include <set>
+#include <string>
+
+struct Main;
+struct Scene;
+
+namespace blender {
+namespace io {
+namespace alembic {
+
+/* Container for an Alembic archive and time sampling info.
+ *
+ * Constructor arguments are used to create the correct output stream and to set the archive's
+ * metadata. */
+class ABCArchive {
+ public:
+  typedef std::set<double> Frames;
+
+  Alembic::Abc::OArchive *archive;
+
+  ABCArchive(const Main *bmain,
+             const Scene *scene,
+             AlembicExportParams params,
+             std::string filename);
+  ~ABCArchive();
+
+  uint32_t time_sampling_index_transforms() const;
+  uint32_t time_sampling_index_shapes() const;
+
+  Frames::const_iterator frames_begin() const;
+  Frames::const_iterator frames_end() const;
+  size_t total_frame_count() const;
+
+  bool is_xform_frame(double frame) const;
+  bool is_shape_frame(double frame) const;
+
+  ExportSubset export_subset_for_frame(double frame) const;
+
+  void update_bounding_box(const Imath::Box3d &bounds);
+
+ private:
+  std::ofstream abc_ostream_;
+  uint32_t time_sampling_index_transforms_;
+  uint32_t time_sampling_index_shapes_;
+
+  Frames xform_frames_;
+  Frames shape_frames_;
+  Frames export_frames_;
+
+  Alembic::Abc::OBox3dProperty abc_archive_bbox_;
+};
+
+}  // namespace alembic
+}  // namespace io
+}  // namespace blender