Posts

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MBTA bus data in Max

Sonification of Mass Ave buses, from Harvard to Dudley.

Screen Shot 2014-11-11 at 3.26.16 PM

This patch sends requests to the MBTA developer portal to get the current location of buses – using the Max js object. Latitude and Longitude data is mapped to oscillator pitch. Data is polled every 10 seconds, but it seems like the results might be more interesting to poll at a slower rate, because the updates don’t seem that frequent. And buses tend to stop a lot.

MBTA developer portal: https://reactivemusic.net/?p=17511

Here is the get request URL used in the patch:

http://realtime.mbta.com/developer/api/v2/vehiclesbyroute?api_key=wX9NwuHnZU2ToO7GmGR9uw&route=01&format=json
download

https://github.com/tkzic/internet-sensors

folder: mbta

patches:

  • mbta.maxpat
  • mbta.js
  • poly-oscillator.maxpat
authentication

You will not need authentication to run run this patch. It uses the default developer API-key for testing. Please read the terms of service at the MBTA developer portal. Data should not be polled more often than 10 seconds. You can also request your own developer API key from MBTA.

instructions
  • Open mbta.maxpat
  • Toggle the metro (at the top of the patch) to start polling
  • Turn on the audio (at the bottom of the patch) and turn up the gain

Note: there will be more buses running during rush hours in Boston.  Try experimenting with the polling rate and ramp length in the poly-oscillator patch. Also, you can experiment with the pitch range.

 

data-stream-switch.maxpat

 

Posted on

ep-413 DSP week 10

Music from data

seagulls

We looked at Vine API Examples from Eli and Steve H.

OSC (Open Sound Control)
  • Max udpsend, udpreceive, touchOsc, aka.speech
  • using a wifi router for performance projects

Using an Osc server to handle Internet API’s

Searchtweet (rate limited): https://reactivemusic.net/?p=17425

Max oggz streaming example: https://reactivemusic.net/?p=17504

We talked about cartoons: https://reactivemusic.net/?p=10091

Sonification
  • parameter mapping
  • modeling
  • earcons

We didn’t talk about alarm fatigue…

MBTA bus example in Max:

(parameter mapping sonification)

https://reactivemusic.net/?p=17524

  • documentation
  • API keys
  • JSON
  • Max example
Unsolved problems

Is it possible to generate music from data?

Posted on

Audio streaming object in Max

oggrx~ and oggtx~

by Robin Gareus

At Cycling 74 forum: https://cycling74.com/forums/topic/streaming-internet-radio-in-maxmsp/

notes

I was able to receive mp3 files from a server in Max 6.18. using oggrx~. There doesn’t appear to be transport control – so this would need to be built in for synchronization.

Unexpected find: The external uses “secret rabbit code” for resampling. So it works in Max. And we have the source code but not the i386 libs that were used to compile it.

There is no binary for v.7 of oggrx~.mxo, but there is one for v.6

Original c74 post by umma08:

i managed to get Robin Gareus’ externals. They are available here, though they are unmaintained.

The binaries are still online at:

http://gareus.org/d/oggZmax-v0.6-i386.zip

http://gareus.org/d/oggZmax-v0.7-rc2-i386.zip

It’s been more than 3 years (OSX 10.5) since I last looked at it, it
should still work, but I don’t know. Please let me know if you encounter
any problems, so that I can warn others.

I don’t maintain this external anymore. I neither have a MAX/MSP
license, nor do I own any Apple devices. On the upside, complete
source-code is available from

http://gareus.org/gitweb/?p=maxmsp.git;a=snapshot;sf=tgz