From: Ganesh Ajjanagadde <[email protected]>
---
One of the api requirements for pixlet.
Vittorio
libavutil/intmath.h | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/libavutil/intmath.h b/libavutil/intmath.h
index a5ee652..780bbab 100644
--- a/libavutil/intmath.h
+++ b/libavutil/intmath.h
@@ -44,6 +44,10 @@
# endif
#endif /* ff_log2 */
+#ifndef ff_clz
+# define ff_clz(v) __builtin_clz(v)
+#endif /* ff_clz */
+
#endif /* AV_GCC_VERSION_AT_LEAST(3,4) */
extern const uint8_t ff_log2_tab[256];
@@ -132,6 +136,21 @@ static av_always_inline av_const int ff_ctz_c(int v)
}
#endif
+#ifndef ff_clz
+#define ff_clz ff_clz_c
+static av_always_inline av_const unsigned ff_clz_c(unsigned x)
+{
+ unsigned i = sizeof(x) * 8;
+
+ while (x) {
+ x >>= 1;
+ i--;
+ }
+
+ return i;
+}
+#endif
+
/**
* Trailing zero bit count.
*
--
2.10.0
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