question: whether has extension x concode_field_sep int packet_len concode_elem_sep byte[] packet concode_field_sep long getSscr concode_elem_sep void setSscr concode_elem_sep boolean hasPadding concode_elem_sep void setExtension concode_elem_sep int getSequenceNumber concode_elem_sep byte[] getPacket concode_elem_sep boolean hasMarker concode_elem_sep void setBit concode_elem_sep long getTimestamp concode_elem_sep void setPayload concode_elem_sep void setPayloadType concode_elem_sep void setTimestamp concode_elem_sep void setPayloadLength concode_elem_sep boolean getBit concode_elem_sep int getVersion concode_elem_sep int getPayloadType concode_elem_sep void setPadding concode_elem_sep void init concode_elem_sep void init concode_elem_sep void init concode_elem_sep void setMarker concode_elem_sep void setVersion concode_elem_sep long[] getCscrList concode_elem_sep int getPayloadLength concode_elem_sep void setInt concode_elem_sep long getLong concode_elem_sep byte[] getPayload concode_elem_sep int getInt concode_elem_sep int getInt concode_elem_sep void setCscrList concode_elem_sep void setLong concode_elem_sep void setSequenceNumber concode_elem_sep int getLength concode_elem_sep int getCscrCount concode_elem_sep int getHeaderLength
target: boolean function ( ) { if ( packet_len >= 12 ) return getBit ( packet [ 0 ] , 4 ) ; else return false ; }