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diff --git a/gpr/source/lib/vc5_decoder/syntax.h b/gpr/source/lib/vc5_decoder/syntax.h
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+++ b/gpr/source/lib/vc5_decoder/syntax.h
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+/*! @file syntax.h
+ *
+ *  @brief Declare functions for parsing the bitstream syntax of encoded samples.
+ *
+ *  (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 DECODER_SYNTAX_H
+#define DECODER_SYNTAX_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+    TAGVALUE GetSegment(BITSTREAM *stream);
+
+    TAGWORD GetValue(BITSTREAM *stream, int tag);
+
+    TAGVALUE GetTagValue(BITSTREAM *stream);
+
+    bool IsTagOptional(TAGWORD tag);
+
+    bool IsTagRequired(TAGWORD tag);
+
+    bool IsValidSegment(BITSTREAM *stream, TAGVALUE segment, TAGWORD tag);
+
+    bool IsTagValue(TAGVALUE segment, int tag, TAGWORD value);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // DECODER_SYNTAX_H