Re: How to test for the existance of an audio file

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Bayonne distinguishes between paths that resolve to a voice library and 
are presumed to be static/unchanging (and can be on a read-only 
filesystem), and those that reference modifiable file space (usually in 
/var/lib/bayonne/xxx/) and does name manipulations based on this.  Also 
-file uses a simpler form and probably requires the extension.

Hence, for what you want to do, I think you want a file space and a 
partial path:

	.dir myworkspace
	...
	if -file myworkspace/xxx.au
	then
		play myworkspace/xxx.au
	else
		play missing_message
	endif

Using "play.one myworkspace/xxx.au missing_message" should also 
accomplish this effect, since it plays only "one" of those as found...


Tony White wrote:
> David,
> 
> I've tried your suggestion - but no joy (yet!).  I'm using bayonne1,
> so I looked at file.cpp (in ccscript2 source) and found tests
> 'exists', 'file', and 'dir' (with exists and file being essentially
> the same) - but I'm not a c++ expert ;)
> 
> So, I have 'use file' at the top of the script, and within the script i have:
> 
> set %1 "file_to_play"
> .
> .
> .
> if -file %1
> then
>   play %1
> else
>   play missing_message
> endif
> 
> but I always get the missing_message.au playing.  %1 contains the name
> of the file to play, without the .au suffix
> 
> I am assuming that the same conditions apply as with 'play' - so that
> the default extension is .au, and the various possible locations for
> the file are searched (although, to avoid path problems confusing the
> issue, both file_to_play.au, and missing_message.au are in
> /usr/local/share/bayonne/UsEngM
> 
> What am I doing wrong?
> 
> Tony
> 
> 
> 2008/5/1 David Sugar <[email protected]>:
>> Yes there is.  With "if -file xxx"  or "do -file xxx" in a loop, "case
>> -file", etc.  There is a -file and -dir option for conditional tests. With
>> Bayonne and ccscript2 these were installed as a separate dso with "use
>> file", with bayonne2 they are built-ins.  Check server/runtime.cpp
>> "addConditional" for full list....
>>
>>
>>
>>  Tony White wrote:
>>
>>> Thanks David,
>>>
>>> So there is no way, other than jumping into a TGI script, to test for
>>> an audio (or other) file's existance, so that a decision can be made
>>> if a file is not present?  Do you think it feasible that an external
>>> TGI script is run after every keypress as a caller makes choices?  Or
>>> is it better to run one TGI script at the start of the call, to
>>> populate an array with ALL possible files' presence or absence?  The
>>> files may run into the tens of thousands! so it would be a VERY big
>>> array - and would be at least four-dimensional.  And as the system is
>>> dynamic, files may appear, or disappear from one call to the next.
>>>
>>> Tony
>>>
>>> 2008/5/1 David Sugar <[email protected]>:
>>>
>>>> There is a "play.one" option, that plays the first file that is found,
>> and
>>>> only one, out of a list.  There is a "play.any" I think, that plays any
>> that
>>>> can be found and skips any not found in a list.  The default is to abort
>> if
>>>> not found.
>>>>
>>>>
>>>>
>>>>  Tony White wrote:
>>>>
>>>>
>>>>> Hi David and all,
>>>>>
>>>>> In bayonne script, if I list several files to play eg.
>>>>>
>>>>> play %1 %2 %3 ......
>>>>>
>>>>> ...where %1, %2, %3 etc. variables have been set to file1.au,
>>>>> file2.au, file3.au .....
>>>>>
>>>>> so long as all three files exist on disk, then all is well.  BUT if,
>>>>> for example, file1.au doesn't exist, then the play will abort -
>>>>> without playing the rest of the files.
>>>>>
>>>>> The files are dynamically generated outside the bayonne environment -
>>>>> and may sometimes be missing.  So I am stuck on how to test within a
>>>>> script that a file exists before attempting to play it - and indeed to
>>>>> substitute a 'default' file instead.
>>>>>
>>>>> The only way i can see is to jump out into a TGI - but is there
>>>>> already a way to test this?  And if not, maybe this would be a
>>>>> possible test to include in the next version?
>>>>>
>>>>> Oh - and before I get the suggestion:
>>>>> play %1
>>>>> play %2
>>>>> play %3
>>>>> ....
>>>>>
>>>>> yes, that works insofar as playing all  files, even if one is missing
>>>>> - but there is a 'step' delay between each 'play' statement - which I
>>>>> want to avoid... and there seems to be no way to see if a file is
>>>>> missing so as to be able to substitute a 'default' file instead.
>>>>>
>>>>> Thanks,
>>>>>
>>>>>
>>>
>>>
>>>
> 
> 
> 

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