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diff --git a/third_party/jpeg-xl/lib/extras/common.h b/third_party/jpeg-xl/lib/extras/common.h
new file mode 100644
index 0000000000..88ed581af3
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+++ b/third_party/jpeg-xl/lib/extras/common.h
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+// Copyright (c) the JPEG XL Project Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#ifndef LIB_EXTRAS_COMMON_H_
+#define LIB_EXTRAS_COMMON_H_
+
+#include <jxl/codestream_header.h>
+#include <jxl/types.h>
+
+#include <vector>
+
+#include "lib/jxl/base/status.h"
+
+namespace jxl {
+namespace extras {
+
+// TODO(sboukortt): consider exposing this as part of the C API.
+Status SelectFormat(const std::vector<JxlPixelFormat>& accepted_formats,
+                    const JxlBasicInfo& basic_info, JxlPixelFormat* format);
+
+}  // namespace extras
+}  // namespace jxl
+
+#endif  // LIB_EXTRAS_COMMON_H_