Author: Tom Zicarelli

Posted on

Twitter streaming php decoder breaks out individual tweets

This code was adapted (i.e. stolen verbatim) from a stackoverflow post by drew010

http://stackoverflow.com/questions/10337984/using-the-curl-output

Here’s the code. It solves a huge problem for the class of projects which need to grab a large amount of tweets in real time to either save in a database, or trigger some action.

My version of the code is in tkzic/api/twitterStream1.php

<?php

$USERNAME = 'youruser';
$PASSWORD = 'yourpass';
$QUERY    = 'nike';

/**
 * Called every time a chunk of data is read, this will be a json encoded message
 * 
 * @param resource $handle The curl handle
 * @param string   $data   The data chunk (json message)
 */
function writeCallback($handle, $data)
{
    /*
    echo "-----------------------------------------------------------\n";
    echo $data;
    echo "-----------------------------------------------------------\n";
    */

    $json = json_decode($data);
    if (isset($json->user) && isset($json->text)) {
        echo "@{$json->user->screen_name}: {$json->text}\n\n";
    }

    return strlen($data);
}

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, 'https://stream.twitter.com/1/statuses/filter.json?track=' . urlencode($QUERY));
curl_setopt($ch, CURLOPT_USERPWD, "$USERNAME:$PASSWORD");
curl_setopt($ch, CURLOPT_WRITEFUNCTION, 'writeCallback');
curl_setopt($ch, CURLOPT_TIMEOUT, 20); // disconnect after 20 seconds for testing
curl_setopt($ch, CURLOPT_VERBOSE, 1);  // debugging
curl_setopt($ch, CURLOPT_ENCODING,  'gzip, deflate'); // req'd to get gzip
curl_setopt($ch, CURLOPT_USERAGENT, 'tstreamer/1.0'); // req'd to get gzip

curl_exec($ch); // commence streaming

$info = curl_getinfo($ch);

var_dump($info);
Posted on

Csound in Pure Data on Raspberry-Pi

Today I got Csound running inside Pure Data (using the [csoundapi~] object) on Raspberry-Pi.

These instructions assume you have already installed pd-extended on R-Pi. See this post to learn how. https://reactivemusic.net/?p=4930

Install Csound

# sudo apt-get install cloud

Install csoundapi~

# sudo apt-get install pd-csound

Copy csoundapi~ library into the pd-extended extras folder

# cd /usr/lib/pd/csound/extras
# sudo cp csoundapi~.pd_linux ../../pd-extended/extra

Here’s a test patch:

Here’s the Csound source file (should be in the same folder as the test patch)

<CsoundSynthesizer>
<CsOptions>
</CsOptions>
<CsInstruments>
;Example by Joachim Heintz

sr = 44100
nchnls = 2
0dbfs = 1
ksmps = 8

giSine    ftgen     0, 0, 2^10, 10, 1

instr 1
kFreq     invalue   "freq"
kAmp      invalue   "amp"
aSin      oscili    kAmp, kFreq, giSine
          outs      aSin, aSin
endin

</CsInstruments>
<CsScore>
i 1 0 10000
</CsScore>
</CsoundSynthesizer>

Here are the source files:

http://zerokidz.com/rpi/csound/cstest2.pd

http://zerokidz.com/rpi/csound/control.csd

Here’s the command line to run the test:

# pd-extended -nogui -noadc cstest2.pd

Here are general instructions on running csound in Pure Data from Victor Lazzarini:

http://booki.flossmanuals.net/csound/_draft/_v/1.0/csound-in-pd/

 

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csoundapi~ in Pd

notes

A preliminary test before trying this in Raspberry-Pi, I used the general instructions for csound in pd from Victor Lazzarini found here:

http://booki.flossmanuals.net/csound/_draft/_v/1.0/csound-in-pd/

to get csound running in pd-extended in Mac OS.

Looks pretty straightforward – biggest question will be compiling the external if it doesn’t install via package manager.

local test files are in tkzic/rpi/pd/csound

Here’s something from Victor Lazzarini which shows csound running on R-Pi

http://csound.1045644.n5.nabble.com/csound-on-raspberry-pi-td5718623.html

Here is installation instructions from Richard Dobson

http://csound.1045644.n5.nabble.com/Raspberry-Pi-w-Csound-td5717410.html

 

 

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Running http: requests from Max

notes
  1. How to separate the status return code  from the actual response data?

For jit.uldl-  status reports get sent out the right outlet and errors are reported in the Max window. However their doesn’t appear to be a way to get the http: status codes or other header data.

For curl, you can write the response (JSON for example) to a file. Then you can read the file using the [js] object and parse the JSON. If you are using [aka.shell] to run the curl command, the stdout and stderr can be routed from the object – for instance, into the Max window. The -v flag (verbose mode) causes curl to output a bunch of header data.

 

 

 

 

Posted on

Car engine enhancement with Max and OBD-II

Much of our driving experience is wrapped up in sounds that happen when you press the pedal to the metal. Like Superman emerging from a phone booth, this 2006 Jetta seems different.  The project connects RPM data from an OBD2 diagnostic sensor with the input of the car radio. Via synthesizers.

[update 11/2013 – source code is available at https://github.com/tkzic/automax  – this version features

  • V8 engine
  • Jet engine
  • Spaceship
  • Star Trek TOS transporter button
  • Korg nano-control Midi controller interface]

This project uses the RPM data from an automobile OBD-II port to control the engine speed of an engine simulation from Andy Farnell’s book “Designing Sound”

Here’s the patch that polls and translates OBD-II data

patch is tkzic/automax/rpm4.maxpat

Here’s a Max version of the Farnell car engine simulation:

patch is tkzic/automax/waveguide_engine2e-1.maxpat

 

 

 

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Using a Wiimote with Osculator in Max

Update 6/2014: The Max patch is available from the max-projects archive: https://reactivemusic.net/?p=11130

original post

I had a difficult day with wiimotes…

Here’s a general purpose Max patch to read Wiimote Osc data from Osculator:

Located in tkzic/max teaching examples/wiimote/wiimote_read.maxpat

<code>
----------begin_max5_patcher----------
1412.3oc2ZsrjahCEcs8WgJVSr06GYWlY0rJUMyxolJEFqzMorAW.ticmJ+6
iPxNF2sMPm1Hn7hz.JXw4dz8w4J3GSmDrHamtH.7Qv+BlL4GSmLwNT0.SNb8
jf0Q6hWEUXusfT82yV7sfP2+UodWoc3O+O+4Gxy1VpAygf4Hvb7waYSTY7iI
oO7kbcbo6Iww7YbNiSUg.DGMCZN.kUGvvYPv+c3WltcsYFWoKsOY5gQ+ZVZY
Qxy5pwPXyOxMr6NK2uQ6dFAAg092ulyjkV3ZLgOfYA0lxzn01eYvmxShVEbB
BIoGQ.pZreNcZ0eBeezUgNcIHIeeCjDBBYyXHjjhL7ByROLRKjDrYRpt0SGb
qeWCVuBo9kKROX7DOX7wYqWqSKek0GEGqWoyiJSxR+HXW39vm6XrBVQswJtC
XQ6LQ9CKrWO6hbi7hbCdfcLhZhNjF+h9Kn.w8fs+0UYl4nq1ncQBHbYGIW0F
wWxFoyDJnRH90iJ2XQk57unSiVrRWmadU5SCJiJqxctHJ8gS4OW7Pb1prb2M
AmoXbAkYbIqfGz3nJ4Jt8xKkwEIFZWqlR3Jv39z0RNz19ttlk41a6pwPX0Yq
u2SgUX3XfdOyE5thdQCcjabbC7NC+5JhpaWnKaL3aclMNt8snLlz1Wiy2RPT
7FJHRGPcnwOZrCMn7QMv7LVnyAkYf0Uje8wRRAetHd6pnxr7YfDcH36IIm5t
aURpNNaapcJIWeEj.g1rCxP.EZEwxrGnuaQrW1s0GB7WrsrLKsoV3bgiHwwv
wFCJQWyw6b+s5VIxK4eZRzDk7JQST9MK6yPqYJuAKmP3G8nOZ3zalgOzMmuo
ACGaBfYmLZwsqVy.lLzEKWzz5MyZntdukhdrC7QgZ4y29oQdMWifNrppbqTn
Hlmjq56UJ5NJ5w+r825dhcEilcVaSHHODrODD0gjYG1RMorGiqYiAMIXrs4f
Ca6dOHJA26Ky45nkUpPWmUpAlxUEY4fkQkQfsEFaEjcTtJ3hhTwMzlAiMCcH
nzoREiQ2FUpmbHdYunRJAQO0u.kAURaWo3KwtiCcsDmyCCaOvmQjDEDW6zam
DWBxi1kfNioXBHwSFGV4OiSpfyvr9LxWI68P++5uqdgIcstpKot.0i4zQvAb
2gdSuz05Lyv8RWQPezZyZcQQzC5WQXysJDluIeektFI2HbxbBCxkJd0IbjRw
LmfgD5oE1ttGGtFeEts2fXSePYsFe0Yp8xz4aUTAtOTyd1t.bGs+bJ7XnWg5
6zvcD4JGE84drAf6IhULlJIAlSZh9culwiEjvnVJHwdOEjtVQIAdLnp1z6IR
IYbOI9jy8mocXuy7gjZnzit3eBL+OZU30Ai2kfAgICgGNGOJRI3bT.0jgc3z
c6eFLOI2brXNpoNzTVWHkKMMeP3RDTMbj41kaLrgN4IMPAgv1oJ2KeRo5X2d
uc0nmUmhHEDrcqBogVI1HDUb8chENJ7Jqdglcvoy8V0akIw+N9bWhcXuG2L6
DZ6b4EecuV6qZ7yorhrs4wGgzw0FvIabotnLI0typ0toJHV6ldLY4RcZc4NK
SJpT.YMJ3EW75Jddwi5x3w1ND.Ml.j+XnpumY.tM.I7KdPsfGLzu3osErpO1
GOgGmuQaKXu.08If3cgendCNht.Gh+Vt5BdPb+4N2kDzUe0o9BOntfGkmCuH
slfl5YD0ZFQOim1Vx33QFAI7GfrOpVcg7nGDsKwXdrhQmxA4uRpJbGvi+RIJ
6R7k+7djcpBleCtZS9ixyA6sk7Qp7KdZ0Y1e544cge3b+hmV62gf7KfZsZAV
4W.0dKpROVfuKEvTiM.I7LdZMH62DOtMEJZylmz4EGlRKTBVG8M2l3wCsWlj
5tzNiA45mRNd+xoUy1Om9+nVZpDJ
-----------end_max5_patcher-----------
</code>

Some tips…

  • Use a real Wii remote, not the Nyko. If you do get the Nyko, get the one with motion-plus.
  • update Osculator to the latest version
  • Under parameters (in osculator) press + to add the little pacman symbol labeled “same address”, and set the the OSC URL to whatever you’ll be using like 9000 for Max
  • remember to add the Event type (OSC routing) and value (pacman thing) for every wiimote event you’ll be using
  • remember to enter checkbox on the wiimote window for every type of data you want to send