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<div class="chapter" title="Jacko Opcodes">
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<h2 class="title"><a id="JackoOpcodes"></a>Jacko Opcodes</h2>
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<p>
These opcodes enable the use of Jack ports from within Csound
orchestras and instruments. Ports can receive or send audio
or MIDI data, and send note data.
</p>
<p>
The Jacko opcodes do not replace the Jack driver and Jack
command-line options for Csound, nor do the Jacko opcodes work
with them (hence the name "Jacko" instead of "Jack").
The Jacko opcodes are an independent facility that offers
greater flexibility in signal routing.
</p>
<p>
In addition, the Jacko opcodes can work with the Jack system
in "freewheeling" mode, which enables the use of Jack-enabled
external synthesizers, such as Aeolus or Pianoteq, to render
Csound pieces either faster or, even more importantly, slower
than real time. This is extremely useful for rendering complex
pieces without dropouts using instruments, such as Aeolus,
that may not be available except through Jack.
</p>
<p>
The Jacko opcodes include:
<a class="link" href="JackoInit.html" title="JackoInit"><em class="citetitle">JackoInit</em></a>,
for initializing the current instance of Csound as a Jack client.
<a class="link" href="JackoInfo.html" title="JackoInfo"><em class="citetitle">JackoInfo</em></a>,
for printing information about the Jack daemon, its clients, their ports,
and their connections.
<a class="link" href="JackoFreewheel.html" title="JackoFreewheel"><em class="citetitle">JackoFreewheel</em></a>,
for turning Jack's freewheeling mode on or off.
<a class="link" href="JackoAudioInConnect.html" title="JackoAudioInConnect"><em class="citetitle">JackoAudioInConnect</em></a>,
for creating a connection from an external Jack audio output port to a Jack port in Csound.
<a class="link" href="JackoAudioOutConnect.html" title="JackoAudioOutConnect"><em class="citetitle">JackoAudioOutConnect</em></a>,
for creating a connection from a Jack port in Csound to an external Jack audio input port.
<a class="link" href="JackoMidiInConnect.html" title="JackoMidiInConnect"><em class="citetitle">JackoMidiInConnect</em></a>,
for creating a connection from an external Jack MIDI port. MIDI events from Jack
are received by Csound's regular MIDI opcodes and MIDI interop system.
<a class="link" href="JackoMidiOutConnect.html" title="JackoMidiOutConnect"><em class="citetitle">JackoMidiOutConnect</em></a>,
for creating a connection from a Jack port in Csound to an external Jack MIDI input port.
<a class="link" href="JackoOn.html" title="JackoOn"><em class="citetitle">JackoOn</em></a>,
for turning Jack ports in Csound on or off.
<a class="link" href="JackoAudioIn.html" title="JackoAudioIn"><em class="citetitle">JackoAudioIn</em></a>,
for receiving audio from a Jack input port in Csound, which in turn has received the audio
from its connected external port.
<a class="link" href="JackoAudioOut.html" title="JackoAudioOut"><em class="citetitle">JackoAudioOut</em></a>,
for sending audio to a Jack output port in Csound, which in turn will send the audio
on to its connected external port.
<a class="link" href="JackoMidiOut.html" title="JackoMidiOut"><em class="citetitle">JackoMidiOut</em></a>,
for sending MIDI channel messages to a Jack output port in Csound, which in turn
will send the MIDI on to its connected external port.
<a class="link" href="JackoNoteOut.html" title="JackoNoteOut"><em class="citetitle">JackoNoteOut</em></a>,
for sending a note (with duration) to a Jack output port in Csound,
which in turn will send the note on to its connected external port.
<a class="link" href="JackoTransport.html" title="JackoTransport"><em class="citetitle">JackoTransport</em></a>,
for controlling the Jack transport.
</p>
<p>
A typical scenario for the use of the Jacko opcodes would be something like this.
</p>
<div class="refsect1" title="Example">
<a id="idp12044840"></a>
<h2>Example</h2>
<p>
Here is an example of the Jacko opcodes. It uses the file <a class="ulink" href="examples/jacko.csd" target="_top"><em class="citetitle">jacko.csd</em></a>.
</p>
<div class="example">
<a id="idp12046432"></a>
<p class="title">
<strong>Example 8. Example of the Jacko opcodes.</strong>
</p>
<div class="example-contents">
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
csound -m255 -M0 -+rtmidi=null -RWf --midi-key=4 --midi-velocity=5 -o jacko_test.wav
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">;;;;</span>
<span class="comment">;;;; NOTE: this csd must be run after starting "aeolus -t".</span>
<span class="comment">;;;;</span>
<span class="ohdr">sr</span> <span class="op">=</span> 48000
<span class="comment">; The control rate must be BOTH a power of 2 (for Jack)</span>
<span class="comment">; AND go evenly into sr. This is about the only one that works!</span>
<span class="ohdr">ksmps</span> <span class="op">=</span> 128
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="opc">JackoInit</span> "default", "csound"
<span class="comment">; To use ALSA midi ports, use "jackd -Xseq"</span>
<span class="comment">; and use "jack_lsp -A -c" or aliases from JackInfo,</span>
<span class="comment">; probably together with information from the sequencer,</span>
<span class="comment">; to figure out the damn port names.</span>
<span class="comment">; JackoMidiInConnect "alsa_pcm:in-131-0-Master", "midiin"</span>
<span class="opc">JackoAudioInConnect</span> "aeolus<span class="op">:</span>out.L", "leftin"
<span class="opc">JackoAudioInConnect</span> "aeolus<span class="op">:</span>out.R", "rightin"
<span class="opc">JackoMidiOutConnect</span> "midiout", "aeolus<span class="op">:</span>Midi<span class="op">/</span>in"
<span class="comment">; Note that Jack enables audio to be output to a regular</span>
<span class="comment">; Csound soundfile and, at the same time, to a sound </span>
<span class="comment">; card in real time to the system client via Jack. </span>
<span class="opc">JackoAudioOutConnect</span> "leftout", "system<span class="op">:</span>playback_1"
<span class="opc">JackoAudioOutConnect</span> "rightout", "system<span class="op">:</span>playback_2"
<span class="opc">JackoInfo</span>
<span class="comment">; Turning freewheeling on seems automatically </span>
<span class="comment">; to turn system playback off. This is good!</span>
<span class="opc">JackoFreewheel</span> 1
<span class="opc">JackoOn</span>
<span class="opc">alwayson</span> "jackin"
<span class="oblock">instr</span> 1
<span class="comment">;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;</span>
ichannel <span class="op">=</span> p1 <span class="op">-</span> 1
itime <span class="op">=</span> p2
iduration <span class="op">=</span> p3
ikey <span class="op">=</span> p4
ivelocity <span class="op">=</span> p5
<span class="opc">JackoNoteOut</span> "midiout", ichannel, ikey, ivelocity
<span class="opc">print</span> itime, iduration, ichannel, ikey, ivelocity
<span class="oblock">endin</span>
<span class="oblock">instr</span> jackin
<span class="comment">;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;</span>
<span class="opc">JackoTransport</span> 3, 1.0
aleft <span class="opc">JackoAudioIn</span> "leftin"
aright <span class="opc">JackoAudioIn</span> "rightin"
<span class="comment">; Aeolus uses MIDI controller 98 to control stops. </span>
<span class="comment">; Only 1 data value byte is used, not the 2 data </span>
<span class="comment">; bytes often used with NRPNs. </span>
<span class="comment">; The format for control mode is 01mm0ggg:</span>
<span class="comment">; mm 10 to set stops, 0, ggg group (or Division, 0 based).</span>
<span class="comment">; The format for stop selection is 000bbbbb: </span>
<span class="comment">; bbbbb for button number (0 based).</span>
<span class="comment">; Mode to enable stops for Divison I: b1100010 (98 </span>
<span class="comment">; [this controller VALUE is a pure coincidence]).</span>
<span class="opc">JackoMidiOut</span> "midiout", 176, 0, 98, 98
<span class="comment">; Stops: Principal 8 (0), Principal 4 (1) , Flote 8 (8) , Flote 2 (10)</span>
<span class="opc">JackoMidiOut</span> "midiout", 176, 0, 98, 0
<span class="opc">JackoMidiOut</span> "midiout", 176, 0, 98, 1
<span class="opc">JackoMidiOut</span> "midiout", 176, 0, 98, 8
<span class="opc">JackoMidiOut</span> "midiout", 176, 0, 98, 10
<span class="comment">; Sends audio coming in from Aeolus out</span>
<span class="comment">; not only to the Jack system out (sound card),</span>
<span class="comment">; but also to the output soundfile.</span>
<span class="comment">; Note that in freewheeling mode, "leftout"</span>
<span class="comment">; and "rightout" simply go silent.</span>
<span class="opc">JackoAudioOut</span> "leftout", aleft
<span class="opc">JackoAudioOut</span> "rightout", aright
<span class="opc">outs</span> aright, aleft
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">f</span> 0 30
<span class="stamnt">i</span> 1 1 30 60 60
<span class="stamnt">i</span> 1 2 30 64 60
<span class="stamnt">i</span> 1 3 30 71 60
<span class="stamnt">e</span> 2
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp12047440"></a>
<h2>Credits</h2>
<p>By: Michael Gogins 2010</p>
</div>
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