libavutil: add av_mod_uintp2

Reviewed-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: James Almer <jamrial@gmail.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/libavutil/common.h b/libavutil/common.h
index 852c1de850..3e62b6d5b7 100644
--- a/libavutil/common.h
+++ b/libavutil/common.h
@@ -211,6 +211,17 @@ static av_always_inline av_const unsigned av_clip_uintp2_c(int a, int p)
 }
 
 /**
+ * Clear high bits from an unsigned integer starting with specific bit position
+ * @param  a value to clip
+ * @param  p bit position to clip at
+ * @return clipped value
+ */
+static av_always_inline av_const unsigned av_mod_uintp2_c(unsigned a, unsigned p)
+{
+    return a & ((1 << p) - 1);
+}
+
+/**
  * Add two signed 32-bit values with saturation.
  *
  * @param  a one value
@@ -466,6 +477,9 @@ static av_always_inline av_const int av_popcount64_c(uint64_t x)
 #ifndef av_clip_uintp2
 #   define av_clip_uintp2   av_clip_uintp2_c
 #endif
+#ifndef av_mod_uintp2
+#   define av_mod_uintp2    av_mod_uintp2_c
+#endif
 #ifndef av_sat_add32
 #   define av_sat_add32     av_sat_add32_c
 #endif