Re: Parse 12 bit numbers from binary file

[Sergey Kovalev <kovserg33@...>]

чт, 4 июл. 2019 г. в 19:02, Russell Haley <russ.haley@gmail.com>:
> The file I am trying to read is here:
>
> https://physionet.org/pn3/twadb/twa00.dat
>
> When I use the existing tool to read the data out I get the following:
>
>   0    -298     127
>   1    -295     132
>   2    -292     137
>   3    -293     141
>   4    -295     145
>   5    -295     149
>   6    -293     153
>   7    -290     160
>   8    -286     167
>   9    -283     176
>
1) file must be binary
2) your file contains pairs of 16bit integers

f=io.open("twa00.dat","rb")
s=f:read"*all"
f:close()

for i=1,#s,4 do
    a,b=string.unpack("<i2i2",s,i)
    print(a,b)
end