[asterisk-dev] ODBC stored voicemail blob object format

[Nir Simionovich]

Hi Kai,

  that's exactly it, when writing to a file, the file is perfectly a 
valid WAV. When the ODBC storage engine is used,
the BLOB object created isn't a valid WAV object.

Nir

Kai Hörner wrote:
> Hi,
>
> i was just asking, because i used some flash media player once to 
> playback asterisk voicemails .. and it worked fine.
>
> this was in times of asterisk 1.2 though, but i'm unable to believe 
> that PCM support has been broken over time.
>
> i guess some of the core developers would have answered "there already 
> is proper WAV support in asterisk", but they're all on thanksgiving 
> holidays.
>
> I believe the problem is somewhere on the flash side. (or database, or 
> you rest application)
>
> you can try the following to confirm what i'm saying:
> - define a test mailbox that is written to disk using wav/wav49
> - record one voicemail for testing
> - playback this wav file with one of the plenty free flash media players
>
> can you write voicemails to disk and ODBC?
> that would allow you to compare the data.
>
>
> HTH,
>
> Kaii
>
>
>
> Nir Simionovich schrieb:
>> Oh yes, of course - been there, done that.
>>
>> Nir S
>>
>> Kai Hoerner wrote:
>>  
>>> Hello Nir,
>>>
>>> have you already tried replacing the format "WAV" with "wav49" in 
>>> voicemail config? (or vice versa)
>>>
>>>
>>> Regards,
>>>
>>> Kaii
>>>
>>>
>>> Nir Simionovich schrieb:
>>>      
>>>> Hi all,
>>>>
>>>>   I've developed a REST based API that is capable of fully 
>>>> integrating with the ODBC storage and management
>>>> engine for app_voicemail. However, I've reached somewhat of an 
>>>> impass when trying to playback messages
>>>> stored as BLOBs using a Flash Player.
>>>>
>>>>   In general, I gathered the the BLOB object stored in the database 
>>>> isn't a full WAV file format, and actually is
>>>> a RAW ADPCM file, which is playable from a standard media player. 
>>>> However, the file in non-playable from
>>>> an ADOBE based flash player - which requires a fully standard WAV 
>>>> file.
>>>>
>>>>   Questions that arise in this case are:
>>>> 1. Is there a method to convert the stored BLOB to a valid WAV format?
>>>> 2. Adding proper WAV support to Asterisk, is it feasible?
>>>> 3. Is there an external method of converting from the RAW format to 
>>>> proper WAV? (tried SOX with no success).
>>>>
>>>>   I'm not an audiophile, so I'm kind'a of at a loss here.
>>>>
>>>> Cheers,
>>>>   Nir S
>>>>