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-rw-r--r--libavcodec/unary.h15
1 files changed, 14 insertions, 1 deletions
diff --git a/libavcodec/unary.h b/libavcodec/unary.h
index 908dc93507..d57f9f70c5 100644
--- a/libavcodec/unary.h
+++ b/libavcodec/unary.h
@@ -28,7 +28,20 @@
* @param gb GetBitContext
* @param[in] stop The bitstop value (unary code of 1's or 0's)
* @param[in] len Maximum length
- * @return Unary length/index
+ * @return unary 0 based code index. This is also the length in bits of the
+ * code excluding the stop bit.
+ * (in case len=1)
+ * 1 0
+ * 0 1
+ * (in case len=2)
+ * 1 0
+ * 01 1
+ * 00 2
+ * (in case len=3)
+ * 1 0
+ * 01 1
+ * 001 2
+ * 000 3
*/
static inline int get_unary(GetBitContext *gb, int stop, int len)
{