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diff --git a/gpr/source/lib/common/private/macros.h b/gpr/source/lib/common/private/macros.h
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+++ b/gpr/source/lib/common/private/macros.h
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+/*! @file gpr_macros.h
+ *
+ *  @brief Definitions of useful inline functions that are used everywhere in code.
+ *
+ *  @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 GPR_MACROS_H
+#define GPR_MACROS_H
+
+#ifndef neg
+    #define neg(x)	(-(x))
+#endif
+
+#define DivideByShift(x, s)		((x) >> (s))
+
+STATIC_INLINE uint16_t clamp_uint(int32_t value, uint32_t precision)
+{
+    const int32_t limit = ((1 << precision) - 1);
+    
+    if (value < 0)
+        value = 0;
+    else if (value > limit)
+        value = limit;
+    
+    return (uint16_t)value;
+}
+
+STATIC_INLINE uint16_t clamp_uint16(int32_t value)
+{
+    return (uint16_t)clamp_uint( value, 16);
+}
+
+STATIC_INLINE uint16_t clamp_uint14(int32_t value)
+{
+    return (uint16_t)clamp_uint( value, 14);
+}
+
+STATIC_INLINE uint16_t clamp_uint12(int32_t value)
+{
+    return (uint16_t)clamp_uint( value, 12);
+}
+
+STATIC_INLINE uint8_t clamp_uint8(int32_t value)
+{
+    return (uint8_t)clamp_uint( value, 8);
+}
+
+STATIC_INLINE int minimum(int a, int b)
+{
+    return (a < b) ? a : b;
+}
+
+STATIC_INLINE int maximum(int a, int b)
+{
+    return (a < b) ? b : a;
+}
+
+STATIC_INLINE int absolute(int a)
+{
+    return (a < 0) ? -a : a;
+}
+
+STATIC_INLINE uint32_t Swap32(uint32_t value)
+{
+    value = (value & 0x0000FFFF) << 16 | (value & 0xFFFF0000) >> 16;
+    value = (value & 0x00FF00FF) << 8 | (value & 0xFF00FF00) >> 8;
+    return value;
+}
+
+#endif // GPR_MACROS_H