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diff --git a/gpr/source/lib/vc5_encoder/component.h b/gpr/source/lib/vc5_encoder/component.h
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+/*! @file component.h
+ *
+ *  @brief Declaration of routines for the inverse component transform and permutation.
+ 
+ *  A codebooks contains the variable-length codes for coefficient magnitudes, runs
+ *  of zeros, and special codewords that mark entropy codec locations in bitstream.
+ 
+ *  The codebook is used to create tables and simplify entropy coding of signed values
+ *  and runs of zeros.
+ *
+ *  (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 COMPONENT_H
+#define COMPONENT_H
+
+/*!
+ @brief Data structure for the component transform (16 bit precision)
+ */
+typedef struct _component_transform
+{
+    uint16_t component_count;
+    uint16_t *transform_matrix;
+    uint16_t *transform_offset;
+    uint16_t *transform_scale;
+    
+} COMPONENT_TRANSFORM;
+
+/*!
+ @brief Data structure for the component permutation
+ */
+typedef struct _component_permutation
+{
+    uint16_t component_count;
+    uint16_t *permutation_array;
+    
+} COMPONENT_PERMUTATION;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+    
+    CODEC_ERROR InitComponentTransform(COMPONENT_TRANSFORM *transform);
+
+    CODEC_ERROR InitComponentPermutation(COMPONENT_PERMUTATION *permutation);
+    
+    CODEC_ERROR AllocateComponentTransform(gpr_allocator *allocator,
+                                           COMPONENT_TRANSFORM *transform,
+                                           int component_count);
+
+    CODEC_ERROR AllocateComponentPermutation(gpr_allocator *allocator,
+                                             COMPONENT_PERMUTATION *permutation,
+                                             int component_count);
+
+    CODEC_ERROR ReleaseComponentTransform(gpr_allocator *allocator,
+                                          COMPONENT_TRANSFORM *transform);
+    
+    CODEC_ERROR ReleaseComponentPermutation(gpr_allocator *allocator,
+                                            COMPONENT_PERMUTATION *permutation);
+    
+    CODEC_ERROR InitComponentTransformIdentity(COMPONENT_TRANSFORM *transform,
+                                               int component_count,
+                                               gpr_allocator *allocator);
+
+    CODEC_ERROR InitComponentPermutationIdentity(COMPONENT_PERMUTATION *permutation,
+                                                 int component_count,
+                                                 gpr_allocator *allocator);
+    
+    CODEC_ERROR InitComponentTransformTesting(COMPONENT_TRANSFORM *transform,
+                                              int component_count,
+                                              gpr_allocator *allocator);
+
+    CODEC_ERROR InitComponentPermutationTesting(COMPONENT_PERMUTATION *permutation,
+                                                int component_count,
+                                                gpr_allocator *allocator);
+
+    bool IsComponentTransformIdentity(COMPONENT_TRANSFORM *transform);
+
+    bool IsComponentPermutationIdentity(COMPONENT_PERMUTATION *permutation);
+
+    CODEC_ERROR WriteComponentTransform(COMPONENT_TRANSFORM *transform, BITSTREAM *stream);
+
+    CODEC_ERROR WriteComponentPermutation(COMPONENT_PERMUTATION *permutation, BITSTREAM *stream);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // COMPONENT_H