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diff --git a/gpr/source/lib/vc5_common/companding.h b/gpr/source/lib/vc5_common/companding.h
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+/*! @file companding.h
+ *
+ *  @brief Declaration of the routines for computing the companding curves
+ *  that is applied to the quantized coefficient magnitudes.
+ *
+ *  @version 1.0.0
+ *
+ *  (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 COMPANDING_H
+#define COMPANDING_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+    int32_t CompandedValue(int32_t value);
+   
+    uint32_t CompandingParameter(void);
+
+    CODEC_ERROR ComputeCubicTable(int16_t cubic_table[], int cubic_table_length, int16_t maximum_value);
+
+    // Invert the companding curve applied to a quantized coefficient magnitude (for debugging)
+    int32_t UncompandedValue(int32_t value);
+    
+    PIXEL UncompandedPixel(PIXEL value);
+    
+    CODEC_ERROR InvertCompanding(PIXEL *image, DIMENSION width, DIMENSION height, DIMENSION pitch);
+
+#ifdef __cplusplus
+}
+#endif
+        
+#endif // COMPANDING_H