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diff --git a/gpr/source/lib/vc5_decoder/inverse.h b/gpr/source/lib/vc5_decoder/inverse.h
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+++ b/gpr/source/lib/vc5_decoder/inverse.h
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+/*! @file inverse.h
+ *
+ *  @brief Declaration of the inverse wavelet transform functions.
+ *
+ *  (C) Copyright 2018 GoPro Inc (http://gopro.com/).
+ *
+ *  Licensed under either:
+ *  - Apache License, Version 2.0, http://www.apache.org/licenses/LICENSE-2.0
+ *  - MIT license, http://opensource.org/licenses/MIT
+ *  at your option.
+ *
+ *  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.
+ */
+
+#ifndef INVERSE_H
+#define INVERSE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+    
+    CODEC_ERROR InvertSpatialQuant16s(gpr_allocator *allocator,
+                                      PIXEL *lowlow_band, int lowlow_pitch,
+                                      PIXEL *lowhigh_band, int lowhigh_pitch,
+                                      PIXEL *highlow_band, int highlow_pitch,
+                                      PIXEL *highhigh_band, int highhigh_pitch,
+                                      PIXEL *output_image, int output_pitch,
+                                      DIMENSION input_width, DIMENSION input_height,
+                                      DIMENSION output_width, DIMENSION output_height,
+                                      QUANT quantization[]);
+
+    CODEC_ERROR InvertSpatialQuantDescale16s(gpr_allocator *allocator,
+                                             PIXEL *lowlow_band, int lowlow_pitch,
+                                             PIXEL *lowhigh_band, int lowhigh_pitch,
+                                             PIXEL *highlow_band, int highlow_pitch,
+                                             PIXEL *highhigh_band, int highhigh_pitch,
+                                             PIXEL *output_image, int output_pitch,
+                                             DIMENSION input_width, DIMENSION input_height,
+                                             DIMENSION output_width, DIMENSION output_height,
+                                             //ROI roi, PIXEL *buffer, size_t buffer_size,
+                                             int descale, QUANT quantization[]);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // INVERSE_H