[L2Ork-dev] Purr Data and MP3 Objects

Fri Sep 18 10:11:39 EDT 2020

Based on the help file this object needs a lot of love to be truly 
usable. See the transposing part on anything other than the 3 apparently 
hardcoded sampling rates...

That said, it would be great to be able to support mp3 file manipulation.

On 9/16/2020 7:06 PM, Linux ROUEN Normandie wrote:
> Le 17/09/2020 à 00:01, Jonathan Wilkes a écrit :
>> On Wed, Sep 16, 2020 at 4:49 PM Linux ROUEN Normandie
>> <linux.rouen at free.fr> wrote:
>>> Thanks Jonathan,
>>> But that means it's not usable by a standard project user.
>> What means that?
> Well, translation from a poor French man speaking poor English (LOL):
> What I meant is that if you are not a guy who builds patchs/subpatchs 
> using available objects but only a one who is using a ready-to-go 
> project (assembly of patchs) built by someone else, you will never do 
> what have been suggested. Not everybody is a developer-programmer, 
> even I. So, what about a standard user of Purr Data / Pd Vanilla!
>>> You have to
>>> put your hands under the hood and then into the dirty engine.
>>> I just checked [mp3play~] with 'iemlib' r.1.17 properly installed and
>>> declared under Pd Vanilla v.0.50.2 and it's the same bad behavior than
>>> under Purr Data v.2.13.0. Even more, here 'mp3play~-help.pd' is not
>>> present at all.
>> Do you know where the source code is for the version of mp3play~
>> available through Vanilla?
> As I wrote it, it's not available under Pd Vanilla 0.5.2 / iemlib 1.17 
> but only under Purr Data, as far as my little experience.
> I attach to this email what I guess could be the main source file 
> (mp3play~.c), but with no guarantee at all, awa its help file 
> (mp3play~-help.pd).
> This 'C' file seems to have been tested/working only on: 'debugged for 
> windows 013-03-2003' (line 13 of the file).
> These 2 files and few others can be found on your Git repository at: 
> '/purr-data/externals/iemlib/iem_mp3/' (accordingly to the copy I have 
> on my GNU/Linux PC).
>
> - Joseph
>> -Jonathan
>>
>>> -Joseph
>>> - - - - - - - - - - - - - - - - - - - -
>>> Le 16/09/2020 à 21:13, Jonathan Wilkes a écrit :
>>>> On Wed, Sep 16, 2020 at 2:37 PM Linux ROUEN Normandie
>>>> <linux.rouen at free.fr> wrote:
>>>>> Hello Folks,
>>>>>
>>>>> I'm looking for some advises regarding Recording and Playing MP3 
>>>>> files -directly- inside Purr Data v2.13.0+ under GNU/Linux and 
>>>>> Windows.
>>>>>
>>>>> In my MIDI/Audio projects under Purr Data I'm already using 
>>>>> successfully:
>>>>> - [oggwrite~] / [oggread~] for .ogg (Vorbis) files (with lossy 
>>>>> audio compression), and
>>>>> - [writesf~] / [readsf~] for  .wav, .aif, .au and .snd files (with 
>>>>> uncompressed linear pulse-code modulation).
>>>>>
>>>>> But some users are requesting, among other demands, the 
>>>>> possibility to handle also MP3 (with lossy data-compression) for 
>>>>> extending the number of compatible Audio equipment (like TVs) able 
>>>>> to read them.
>>>>>
>>>>> After analysis I found only 2 objects -not tested yet- from the 
>>>>> 'unauthorized' library being able to deal with MP3:
>>>>> - [mp3write~] an MP3 file recorder v.0.4, and
>>>>> - [mp3cast~] an MP3 streamer v.0.5.
>>>>> But there is nothing about an MP3 file reader/player.
>>>>>
>>>>> Despite the many libraries installed by default, Purr Data could 
>>>>> not create any of the following objects (see towards the end of 
>>>>> the link - FR):
>>>>> - [mp3amp~],
>>>>> - [graphic-mp3amp~],
>>>>> - [mp3live~],
>>>>> - [mp3streamout~],
>>>>> - [mp3streamin~],
>>>>> - [mp3fileout~], and
>>>>> - [mp3play~] from 'iemlib library'.
>>>>>
>>>>> * [mp3play~] should be in the 'iemlib' library but it's not there 
>>>>> when its help file is well present in 
>>>>> '/opt/purr-data/lib/pd-l2ork/extra/iemlib/mp3play~-help.pd'.
>>>>> One strange thing is that the 'mp3play~.c' file is well present on 
>>>>> the Git copy I made from Jonathan's repo for my French 
>>>>> translations in:
>>>>> - '/home/joe/GitLab/purr-data/externals/build/src/mp3play~.c' (47 
>>>>> bytes), and
>>>>> - '/home/joe/GitLab/purr-data/externals/iemlib/iem_mp3/src/' (107 
>>>>> kB).
>>>> mp3play~ is not currently getting built (and wasn't in Pd-extended, 
>>>> either).
>>>>
>>>> What a weirdo class structure! After compiling it, you must first 
>>>> create this:
>>>>
>>>> [iem_mp3]
>>>>
>>>> Which will then go in and trigger the setup routine for mp3play~, so
>>>> that you can then do this:
>>>>
>>>> [mp3play~]
>>>>
>>>> Both will create properly. I was able to play the test file and it
>>>> seemed to output something, though couldn't get my headphones to work
>>>> so I don't know if it sounded right.
>>>>
>>>> It appears there are no dependencies for this object, so if we add it
>>>> then it will work in the web app, too!
>>>>
>>>> I guess the first thing to do is look in Pd Vanilla and see if anyone
>>>> has done work on this object since 2003.
>>>>
>>>> -Jonathan
>>>>
>>>>> Any ideas - suggestions about an available and working [MP3 file 
>>>>> reader/player] object?
>>>>> Thank you.
>>>>> - - - - - - - - - - - - - - - - - - - -
>>>>> Best,
>>>>> Joseph Gastelais
>>>>> LINUX ♥ ROUEN ♥ Normandie
>>>>> - - - - - - - - - - - - - - - - - - - -
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