Category Tech

Java SysEx programming

Category: MusicTech Comments: One comment

I’m taking my first steps into the world of JavaSound programming. The first thing I learned is that the Snow Leopard default javax.sound.midi.spi implementation is buggy when it comes to SysEx message transmission. For the time being I’m sticking with the MMJ library instead.

As an example, I’ve been trying to send a “SID Skip Patch” command to my SID station. The SysEx message for this command is F0 00 20 3C 01 00 03 F7.

The following code shows how to construct this message in Java (example based on SendSysex.java at jsresources.org):


String s = "F000203C010003F7";
int n = s.length() / 2;
byte[] msg = new byte[n];
for (int i = 0; i < n; i++) {
    msg[i] = (byte) Integer.parseInt(
    s.substring(i * 2, i * 2 + 2), 16);
}

The next step is to send the resulting byte array to a MIDI out...

Read More

Wireshark on Snow Leopard

Category: Tech Comments: 2 comments

Finally fixed a bug that’s been annoying me for months. I managed to get Wireshark up and running on OSX Snow Leopard – without any crappy workarounds such as running it inside a virtual XP machine. The video below by dangribbin explains it all.

Summarizing the steps:

  1. Download and mount Wireshark for 10.5 Leopard Intel
  2. Drag Wireshark to Applications
  3. Open a terminal and type:
    defaults write com.apple.finder AppleShowAllFiles YES
    killall Finder
    com.apple.Finder (i.e. Finder with a capital F) did not work for me!
    – For more info on defaults type man defaults.
  4. Create /usr/local/bin/ if you don’t already have one.
  5. Drag the Command Line utilities into /usr/local/bin/.
  6. Drag ChmodBPF folder to Startup Items.
  7. In the terminal type:
    sudo chown -R root:wheel ChmodBPF
  8. Launch Wireshark
  9. Add /usr/s...
Read More

Setting up a home audio server

Category: MusicTech Comments: No comments

Over the years my iTunes library has been growing substantially, and so has my collection of computers and harddisks. As a result, my personal archive had become quite scattered. Documents, photos, videos, mp3s, it was everywhere! In my quest to archive everything to a big harddisk attached to my Ubuntu server, I came up with the plan to also have a central music server. That would save a lot of space on my laptop harddisk. Plus I would be able to listen to my music wherever I was, in the house or in the world!

In this article

Read More

Introduction to jVoiceBridge

Category: Tech Comments: No comments

Introduction

The application jVoiceBridge is a software-only audio mixer that handles Voice over IP (VoIP) audio communication and mixing, for tasks such as conference calls, voice chat, speech detection, and audio for 3D virtual environments. Currently it is most commonly known for its use in the Wonderland project, a 3D virtual environment developed by Sun.

In this article

Read More

Adding PHP support to SailFin

Category: Tech Comments: One comment

Finally it is now a breeze to enable PHP on SailFin. PHP is a server-side scripting language which has quite a large user base in the web development community. PHP code is embedded in HTML and sent to a webserver for interpretation. The webserver therefore needs to run a PHP interpreter. The guys from Caucho Technology have made a 100% Java implementation of such an interpreter, called Quercus. Quercus is delivered as a .war file and as such it can be ran on any Java application server – such as SailFin.

Quercus is not on...

Read More