[PD] Maximum length of sysex messages?

Alex x37v.alex at gmail.com
Sat Jan 17 05:06:38 CET 2009

I've been investigating further, I haven't figured out where, in the
source, the problem occurs.. the alsa input midi buffer is quite large
[much larger than 226 bytes],

When testing with amidi, this is the largest message i can send to pd:
F0 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 F7
so I'm doing:
amidi -p hw:2,0 -S "F0 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 F7"

I'm using a virtual device to echo the data to an amidi -d instance as
well as to pd..
amidi -d gets all messages i send... larger ones like:
F0 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 F7
but pd doesn't display any output at all from [midiin] or [sysexin]


On Fri, Jan 16, 2009 at 3:08 PM, Alex <x37v.alex at gmail.com> wrote:
> I made a little test which I've attached.
> With alsa I can receive a maximum sysex message of 98 data bytes [100
> total including the start and end].  I've tried this with a hardware
> loopback (plugging my output into my input) and using a virtual
> device.
> With the default midi [portaudio?] I can receive 128 data bytes [130 total].
> I've attached my test patch [it requires a counter that I've also attached].
> Any idea where these limits are set?
> -Alex
> On 1/16/09, Alex <x37v.alex at gmail.com> wrote:
>> I am trying to get a sysex dump into pd, this dump is 226 bytes long.
>>  I use alsa for midi.  I'm using pd 0.41.4.
>>  I am able to send the sysex data from pd to my device, and the device
>>  sends the data back [I can verify the dump with amidi] but once I
>>  connect my device's output to pd.. I don't see the data in pd
>>  [sysexin] or [midiin]
>>  I've also tried initiating the dump from the device itself (a
>>  synthesizer), I get the same results.. amidi -d will show it but I
>>  don't see the data on pd's [midiin] or [sysexin] inputs once I connect
>>  the device to pd.
>>  So my question is: is anyone aware of a hard coded limit for the length of sysex
>>  messages in pd?  I'd like to increase this limit if possible..
>>  Thanks,
>> Alex

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