[PD] Fwd: Reading and writing binary files

David dfkettle at gmail.com
Sat Feb 26 20:16:54 CET 2011


Thanks. I guess I'll have to try another approach.

I changed the sample length to 2 (I didn't read the documentation very
carefully, I thought the sample length was in bits, not bytes) and now
it works, but I'm left with an array of floating point numbers, and I
still have the problem of writing it out again.

I'm still getting a warning message, but I'm not sure what it's trying
to tell me:

warning: array array1: clearing save-in-patch flag

David.

On Sat, Feb 26, 2011 at 2:04 PM, Mike Moser-Booth <mmoserbooth at gmail.com> wrote:
>
>
> On Sat, Feb 26, 2011 at 1:43 PM, David <dfkettle at gmail.com> wrote:
>>
>> According to the
>> help documentation, the '-raw' flag only applies to reading files. Is
>> that correct?
>
> Well, you can write it back as a soundfile in the formats that [soundfiler]
> supports. But if it needs to be saved in the original format, you might want
> to try some of the other suggestions.
>>
>> Anyway, I tried it and I'm getting a usage error:
>>
>> error: usage: read [flags] filename tablename...
>> flags: -skip <n> -nframes <n> -resize -maxsize <n> ...
>> -raw <headerbytes> <channels> <bytespersamp> <endian (b, l, or n)>.
>>
>> Here's what my patch looks like. I'm not sure what I'm doing wrong.
>>
>> [read -raw 0 1 8 n Default.syx array1(
>> |
>> [soundfiler]
>
> [soundfiler] only supports 2, 3, or 4 bytes per sample...
>>
>> There's no "header" in the file, it's just raw data for a Midi sysex
>> message, and I want to read each byte as an integer value in the range
>> of 0 to 255.
>
> ...which would be 1 byte. Definitely try the other suggestions. :-)
> .mmb
>>
>> David.
>>
>> On Fri, Feb 25, 2011 at 7:26 PM, Mike Moser-Booth <mmoserbooth at gmail.com>
>> wrote:
>> > Try using the -raw flag for [soundfiler]. Setting the <bytespersample>
>> > parameter to 2 will treat it as a 16-bit file.
>> >
>> > .mmb
>> >
>> > On Fri, Feb 25, 2011 at 7:07 PM, David <dfkettle at gmail.com> wrote:
>> >> It's probably very obvious, but I can't figure out how to read and
>> >> write files containing arbitrary binary data. I know there are objects
>> >> for reading and writing sound files, and there's [textfile] for
>> >> reading text files, but I want to read and write binary files, and
>> >> interpret each byte as a 16-bit integer. Does anyone have an example I
>> >> can look at? Since they will be small files, I just need to read them
>> >> sequentially, I don't need to jump around in the file randomly.
>> >>
>> >> _______________________________________________
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>> >>
>> >
>> >
>> >
>> > --
>> > Mike Moser-Booth
>> > mmoserbooth at gmail.com
>> >
>>
>> _______________________________________________
>> Pd-list at iem.at mailing list
>> UNSUBSCRIBE and account-management ->
>> http://lists.puredata.info/listinfo/pd-list
>
>
>
> --
> Mike Moser-Booth
> mmoserbooth at gmail.com
>



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