From 19d57ca62e7134cb3cd5e937443501c417ceb79a Mon Sep 17 00:00:00 2001
From: James Almer <jamrial@gmail.com>
Date: Wed, 22 Feb 2017 12:53:34 -0500
Subject: [PATCH] libavutil: add av_mod_uintp2

Signed-off-by: James Almer <jamrial@gmail.com>
---
 libavutil/common.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/libavutil/common.h b/libavutil/common.h
index d2ddcba9ed..3832f107ba 100644
--- a/libavutil/common.h
+++ b/libavutil/common.h
@@ -182,6 +182,17 @@ static av_always_inline av_const unsigned av_clip_uintp2_c(int a, int p)
     else                   return  a;
 }
 
+/**
+ * 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.
  *
@@ -410,6 +421,9 @@ 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