[PD] strange wave

Andy Farnell padawan12 at obiwannabe.co.uk
Tue Mar 3 12:50:34 CET 2009




Your debug approach is commendable Hans.

Notice that the EOF is different. It's not a well 
formed file unless eof works. The problem, as stated
by another poster, is that the file appears zero length.

Mike

The errors are caused by bad message ordering in the patch.
I have highlighted where they are, and suggested some
corrections (use triggers)

Please be thoughtful of posting in the right thread (It's
okay to start a new one)

a.





On Tue, 03 Mar 2009 12:17:58 +0100
Hans Roels <hans.roels at versateladsl.be> wrote:

> I think/hope that I managed to isolate the problem with writesf~ and 
> readsf~. There are two patches in attach that print out every step 
> that you take so one can't forget to click 'open' for example, it 
> also measures the time between the 'open' and 'start' command. Copy 
> these 2 patches in the same folder.
> 
> Try this test a few times:
> 
> 1. start Pd
> 2. open main.pd
> 3. create abstraction 'rec' in main.pd
> (test writesf~)
> 4. open a file (comment 1 in 'rec')
> 5. start recording (comment 2 in 'rec')
> 6. stop the recording (comment 3 in 'rec')
> 7. send 'print' to writesf~ (comment 4 in 'rec')
> (test readsf~)
> 8. open a file (comment 5 in 'rec')
> 9. play a file (comment 6 in 'rec')
> 10. answer question (comment 7 in 'rec')
> 11. send 'print' to readsf~ (comment 8 in 'rec')
> 12.close Pd & don't save any changes
> 
> I tried this 10 times on Windows XP (Pd 0-42-4) and 10 times in Mac 
> Os X 10.3.9 (Pd 0-40-2) and readsf~ and writesf~ never worked and Pd 
> only created a wav file with the right name but without sample data. 
> Be sure to do exactly the required steps and nothing more. If for 
> example you open 'test audio and midi' in de Media menu (or you 
> delete and restore an audio cable within the abstraction 'rec') 
> before step 12, the opened file will start playing, even if it was 30 
> seconds ago that you opened and tried to play the sound file.  If you 
> try recording (step 4 - 7) everything will work now n this case.
> 
> This is what Pd prints (print commands in abstraction 'rec') when 
> readsf and writesf don't work:
> 
> print: open C:/Program Files/pd042-4/bin/aa.wav
> print: start
> time_beween_open_and_start: 2774.78
> print: stop
> time_beween_start_and_stop: 3297.23
> state 0
> fifo head 0
> fifo tail 0
> fifo size 262144
> fd -1
> eof 0
> print: open C:/Documents and Settings/Bureaublad/pianob7.wav
> print: 1
> time_beween_open_and_start: 3668.75
> readsf_sound?: no
> state 2
> fifo head 70496
> fifo tail 0
> fifo size 262144
> fd -1
> eof 1
> 
> This what Pd prints when writesf and readsf do work after 'test audio 
> and midi' was opened after step 11
> print: open /elektromuziek/extra.wav
> print: start
> time_beween_open_and_start: 1364.17
> print: stop
> time_beween_start_and_stop: 1834.38
> state 0
> fifo head 161792
> fifo tail 161792
> fifo size 262144
> fd -1
> eof 0
> print: open /elektromuziek/PIANOB7.WAV
> print: 1
> time_beween_open_and_start: 1428.03
> readsf_sound?: yes
> state 0
> fifo head 70496
> fifo tail 70400
> fifo size 262144
> fd -1
> eof 1
> 
> I hope someone can solve this problem...
> 
> Hans r
> 
> At 19:32 2/03/2009, IOhannes m zmoelnig wrote:
> >Hans Roels wrote:
> >>Hello,
> >
> >hi.
> >
> >how does this relate to "Arduino/SRF05" to which thread it references?
> >
> >>Sometimes when I record audio in Pd, a wave file is created that Pd
> >[...]
> >>problem yet but I'm trying... (I think it has something to do with 
> >>using 'writesf' in an abstraction).
> >>I 'm working on Windows XP and this problem occured in Pd 0.40.3 
> >>and in 0.42-4.
> >
> >
> >your problem is most likely related to not properly closing the 
> >soundfile. you MUST send a [stop( message to [writesf~] in order to 
> >"finalize" the wav (that is: replace the dummy length in the header 
> >with the proper one, which is only known at closing time)
> >
> >fgmasdr
> >IOhannes
> >
> >
> 


-- 
Use the source
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