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diff --git a/src/piex_cr3.h b/src/piex_cr3.h
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+// Copyright 2020 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+////////////////////////////////////////////////////////////////////////////////
+
+#include "src/piex_types.h"
+
+#ifndef PIEX_PIEX_CR3_H_
+#define PIEX_PIEX_CR3_H_
+
+namespace piex {
+
+// Gets the EXIF orientation of a CR3 stream, returning true on success.
+bool Cr3GetOrientation(StreamInterface* stream, std::uint32_t* orientation);
+
+// Gets preview images of a CR3 stream, returning kOk on success. Assumes the
+// stream is a CR3 stream.
+//
+// Canon's CR3 is based on ISO/IEC 14496-12: ISO base media file format. (CR2 is
+// TIFF based.) A Canon CR3 contains multiple embedded images. Most cameras
+// output CR3 files that contain a full-size JPEG, a 1620x1080 preview JPEG, and
+// a 160x120 thumbnail JPEG.
+// The Canon EOS 1D X Mark III, though, contains a full-size HEVC image, a
+// 1620x1080 preview JPEG, and a 160x120 thumbnail JPEG.
+// Until support for HEVC is added, this method returns the largest embedded
+// JPEG in preview_image_data->preview.
+//
+Error Cr3GetPreviewData(StreamInterface* stream,
+                        PreviewImageData* preview_image_data);
+}  // namespace piex
+
+#endif  // PIEX_PIEX_CR3_H_