bitstream: Properly promote av_reverse values before shifting.

diff --git a/libavcodec/bitstream.c b/libavcodec/bitstream.c
index 97d5b49..b593db5 100644 (file)
--- a/libavcodec/bitstream.c
+++ b/libavcodec/bitstream.c
@@ -116,10 +116,10 @@ static int alloc_table(VLC *vlc, int size, int use_static)
 }
 
 static av_always_inline uint32_t bitswap_32(uint32_t x) {
-    return av_reverse[x&0xFF]<<24
-         | av_reverse[(x>>8)&0xFF]<<16
-         | av_reverse[(x>>16)&0xFF]<<8
-         | av_reverse[x>>24];
+    return (uint32_t)av_reverse[x&0xFF]<<24
+         | (uint32_t)av_reverse[(x>>8)&0xFF]<<16
+         | (uint32_t)av_reverse[(x>>16)&0xFF]<<8
+         | (uint32_t)av_reverse[x>>24];
 }
 
 typedef struct {