Add avio_skip()

libavformat/avio.h

@@ -476,6 +476,12 @@ int avio_put_str16le(AVIOContext *s, const char *str);
  */
 int64_t avio_seek(AVIOContext *s, int64_t offset, int whence);
 
+/**
+ * Skip given number of bytes forward
+ * @return new position or AVERROR.
+ */
+int64_t avio_skip(AVIOContext *s, int64_t offset);
+
 /**
  * ftell() equivalent for AVIOContext.
  * @return position or AVERROR.

libavformat/aviobuf.c

@@ -233,6 +233,11 @@ int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
     return offset;
 }
 
+int64_t avio_skip(AVIOContext *s, int64_t offset)
+{
+    return avio_seek(s, offset, SEEK_CUR);
+}
+
 #if FF_API_OLD_AVIO
 int url_fskip(AVIOContext *s, int64_t offset)
 {