Help/Libraries/JITLib/tutorials/jitlib_basic_concepts_04.html

   1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
   2 <html>
   3 <head>
   4 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
   5 <meta http-equiv="Content-Style-Type" content="text/css">
   6 <title></title>
   7 <meta name="Generator" content="Cocoa HTML Writer">
   8 <meta name="CocoaVersion" content="949.43">
   9 <style type="text/css">
  10 p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 15.0px Helvetica}
  11 p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica; min-height: 14.0px}
  12 p.p3 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica}
  13 p.p4 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica; color: #0021e7}
  14 p.p5 {margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Monaco; min-height: 12.0px}
  15 p.p6 {margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Monaco}
  16 p.p7 {margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Monaco; color: #982316}
  17 p.p8 {margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Monaco; color: #bf0000}
  18 p.p9 {margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Monaco; color: #982316; min-height: 12.0px}
  19 span.s1 {font: 36.0px Georgia}
  20 span.s2 {color: #000000}
  21 span.s3 {text-decoration: underline}
  22 span.s4 {color: #0025b2}
  23 span.s5 {color: #0000ff}
  24 span.s6 {color: #982316}
  25 span.s7 {color: #416d1f}
  26 span.Apple-tab-span {white-space:pre}
  27 </style>
  28 </head>
  29 <body>
  30 <p class="p1"><b>Timing in NodeProxy<span class="Apple-tab-span">       </span><span class="Apple-tab-span">    </span></b><span class="s1"><b>4</b></span></p>
  31 <p class="p2"><br></p>
  32 <p class="p3">Changes that happen to NodeProxy, most importantly setting its source, are normally done</p>
  33 <p class="p3">whenever the put method is called (or, in ProxySpace, the assignment operation = ).</p>
  34 <p class="p3">Sometimes it is desirable to time these changes relative to a clock.</p>
  35 <p class="p2"><br></p>
  36 <p class="p4"><span class="s2">previous: <a href="jitlib_basic_concepts_03.html"><span class="s3">jitlib_basic_concepts_03</span></a><span class="Apple-tab-span">      </span><span class="Apple-tab-span">    </span>next: <a href="../JITLib.html"><span class="s3">JITLib</span></a></span></p>
  37 <p class="p2"><br></p>
  38 <p class="p2"><br></p>
  39 <p class="p3">a) clock</p>
  40 <p class="p3">b) quant and offset</p>
  41 <p class="p3">c) client and server tempo</p>
  42 <p class="p3">d) sample accurate output</p>
  43 <p class="p2"><br></p>
  44 <p class="p2"><br></p>
  45 <p class="p2"><br></p>
  46 <p class="p3"><b>a) clock</b></p>
  47 <p class="p2"><br></p>
  48 <p class="p3">generally, every node proxy can have its own time base, usually</p>
  49 <p class="p3">a tempo clock. the clock is responsible for the timing of insertion</p>
  50 <p class="p3">of new functions, per default at the next beat of the clock.</p>
  51 <p class="p5"><br></p>
  52 <p class="p5"><br></p>
  53 <p class="p5"><br></p>
  54 <p class="p6">p = <span class="s4">ProxySpace</span>.push(s.boot);</p>
  55 <p class="p6">~x.play; ~y.play;</p>
  56 <p class="p5"><br></p>
  57 <p class="p7">// these two synths are started at the time when they are inserted:</p>
  58 <p class="p6">~x = { <span class="s4">Ringz</span>.ar(<span class="s4">Impulse</span>.ar(1), 400, 0.05).dup };</p>
  59 <p class="p6">~y = { <span class="s4">Ringz</span>.ar(<span class="s4">Impulse</span>.ar(1), 600, 0.05).dup };</p>
  60 <p class="p5"><br></p>
  61 <p class="p7">// adding a common clock:</p>
  62 <p class="p6">~x.clock = <span class="s4">TempoClock</span>.default; ~x.quant = 1.0;</p>
  63 <p class="p6">~y.clock = <span class="s4">TempoClock</span>.default; ~y.quant = 1.0;</p>
  64 <p class="p5"><br></p>
  65 <p class="p7">// now they are in sync</p>
  66 <p class="p6">~x = { <span class="s4">Ringz</span>.ar(<span class="s4">Impulse</span>.ar(1), 400, 0.05).dup };</p>
  67 <p class="p6">~y = { <span class="s4">Ringz</span>.ar(<span class="s4">Impulse</span>.ar(1), 600, 0.05).dup };</p>
  68 <p class="p5"><br></p>
  69 <p class="p7">// for simplicity, one can provide a clock and a quant for a whole proxy space:</p>
  70 <p class="p5"><br></p>
  71 <p class="p6">p.clock = <span class="s4">TempoClock</span>.default; p.quant = 1.0;</p>
  72 <p class="p6">~y = { <span class="s4">Ringz</span>.ar(<span class="s4">Impulse</span>.ar(1), 800, 0.05).dup };</p>
  73 <p class="p5"><br></p>
  74 <p class="p6">~z.play;</p>
  75 <p class="p6">~z = { <span class="s4">Ringz</span>.ar(<span class="s4">Impulse</span>.ar(1), [500, 514], 0.8).dup * 0.1};</p>
  76 <p class="p6">~z = { <span class="s4">Ringz</span>.ar(<span class="s4">Impulse</span>.ar(1), exprand(300, 400 ! 2), 1.8).dup * 0.1 };</p>
  77 <p class="p6">~z = { <span class="s4">Ringz</span>.ar(<span class="s4">Impulse</span>.ar(2), exprand(300, 3400 ! 2), 0.08).dup * 0.2 };</p>
  78 <p class="p6">~z.end;</p>
  79 <p class="p5"><br></p>
  80 <p class="p8"><span class="s2">p.clear; </span>// clear all.</p>
  81 <p class="p5"><br></p>
  82 <p class="p5"><br></p>
  83 <p class="p3"><b>sequence of events:</b></p>
  84 <p class="p3">When inserting a new function into the proxy, the synthdef is built, sent to the server</p>
  85 <p class="p3">who sends back a message when it has completed. Then the proxy waits for the next beat to start</p>
  86 <p class="p3">the synth. When using node proxies with patterns, the patterns are played using the clock as a scheduler.</p>
  87 <p class="p5"><br></p>
  88 <p class="p5"><br></p>
  89 <p class="p5"><br></p>
  90 <p class="p3"><b>b) quant and offset</b></p>
  91 <p class="p2"><br></p>
  92 <p class="p2"><br></p>
  93 <p class="p3">In order to be able to control the offset/quant point of insertion, the 'quant' instance variable can be used,</p>
  94 <p class="p3">which can be either a number or an array of the form [quant, offset], just like in pattern.play(quant).</p>
  95 <p class="p5"><br></p>
  96 <p class="p6">~z.play; ~y.play;</p>
  97 <p class="p6">~z = { <span class="s4">Ringz</span>.ar(<span class="s4">Impulse</span>.ar(2), exprand(300, 3400 ! 2), 0.08).dup * 0.2 };</p>
  98 <p class="p6">~y.quant = [1, 0.3]; // offset of 0.3, quant of 1.0</p>
  99 <p class="p6">~y = { <span class="s4">Ringz</span>.ar(<span class="s4">Impulse</span>.ar(1), 600, 0.05).dup };</p>
 100 <p class="p6">~y.quant = [2, 1/3]; // offset of 1/3, quant of 2.0</p>
 101 <p class="p6">~y = { <span class="s4">Ringz</span>.ar(<span class="s4">Impulse</span>.ar(0.5), 600, 0.05).dup };</p>
 102 <p class="p5"><br></p>
 103 <p class="p5"><br></p>
 104 <p class="p3">quant and offset scheduling is used for the following operations:</p>
 105 <p class="p3"><b>play</b>, <b>put</b>, <b>removeAt</b>, <b>setNodeMap</b>, <b>wakeUp</b>, <b>rebuild</b> (and the rebuild operations lag, setRates, bus_)</p>
 106 <p class="p3">For more information about quantisation<span class="Apple-converted-space">  </span>in SC, see <a href="../../../Scheduling/Quant.html"><span class="s5">Quant</span></a></p>
 107 <p class="p5"><br></p>
 108 <p class="p5"><br></p>
 109 <p class="p5"><br></p>
 110 <p class="p5"><br></p>
 111 <p class="p5"><br></p>
 112 <p class="p3"><b>c) connecting client and server tempo</b></p>
 113 <p class="p5"><br></p>
 114 <p class="p3">a ProxySpace has the method <b>makeTempoClock</b>, which creates an instance of <a href="../nodeproxy/TempoBusClock.html"><span class="s5">TempoBusClock</span></a></p>
 115 <p class="p3">together with a node proxy (~tempo) which it keeps in sync.</p>
 116 <p class="p5"><br></p>
 117 <p class="p5"><br></p>
 118 <p class="p8"><span class="s2">p.makeTempoClock(2.0); </span>// create a new tempoclock with 2 beats/sec</p>
 119 <p class="p6">~y.play; ~x.play;</p>
 120 <p class="p6">~y.quant = 1; // set the quant back to 1 and the offset to 0</p>
 121 <p class="p6">~y = { <span class="s4">Ringz</span>.ar(<span class="s4">Impulse</span>.ar(~tempo.kr), 600, 0.05).dup }; <span class="s6">// impulse uses tempo</span></p>
 122 <p class="p6">~x = <span class="s4">Pbind</span>(<span class="s7">\instrument</span>, <span class="s7">\default</span>, <span class="s7">\freq</span>, <span class="s4">Pseq</span>([300, 400], <span class="s4">inf</span>)); <span class="s6">// pattern uses tempoclock</span></p>
 123 <p class="p5"><br></p>
 124 <p class="p6">p.clock.tempo = 1.0; <span class="s6">// set the tempo to 1</span></p>
 125 <p class="p6">p.clock.tempo = 2.2; // set the tempo to 2.2</p>
 126 <p class="p5"><br></p>
 127 <p class="p6">~x.free;</p>
 128 <p class="p6">~y.free;</p>
 129 <p class="p5"><br></p>
 130 <p class="p5"><br></p>
 131 <p class="p5"><br></p>
 132 <p class="p5"><br></p>
 133 <p class="p3"><b>d) sample accurate output</b></p>
 134 <p class="p2"><br></p>
 135 <p class="p3">for efficiency, NodeProxy uses a normal Out UGen for writing to its bus. If sample accurate</p>
 136 <p class="p3">playback is needed (OffsetOut), the ProxySynthDef class variable sampleAccurate can be set to true.</p>
 137 <p class="p3">Note that for audio through from external sources, this creates a delay for up to one block (e.g. about 1 ms.)</p>
 138 <p class="p5"><br></p>
 139 <p class="p9"><br></p>
 140 <p class="p7">// example</p>
 141 <p class="p5"><br></p>
 142 <p class="p6"><span class="s4">ProxySynthDef</span>.sampleAccurate = <span class="s4">false</span>;</p>
 143 <p class="p5"><br></p>
 144 <p class="p6">~x.play;</p>
 145 <p class="p5"><br></p>
 146 <p class="p7">// the grain frees itself</p>
 147 <p class="p6">~x = { <span class="s4">SinOsc</span>.ar(800) * <span class="s4">EnvGen</span>.ar(<span class="s4">Env</span>.perc(0.001, 0.03, 0.4), doneAction:2) };</p>
 148 <p class="p5"><br></p>
 149 <p class="p5"><span class="Apple-tab-span">     </span></p>
 150 <p class="p7">// jittery tone.</p>
 151 <p class="p6">(</p>
 152 <p class="p6">r = Routine {</p>
 153 <p class="p6"><span class="Apple-tab-span">     </span>loop {</p>
 154 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>200.do { <span class="s4">arg</span> i;</p>
 155 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>~x.spawn;</p>
 156 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>(0.005).wait;</p>
 157 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>};</p>
 158 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>1.wait;</p>
 159 <p class="p6"><span class="Apple-tab-span">     </span>}</p>
 160 <p class="p6">}.play;</p>
 161 <p class="p6">)</p>
 162 <p class="p5"><br></p>
 163 <p class="p6"><span class="s4">ProxySynthDef</span>.sampleAccurate = <span class="s4">true</span>;</p>
 164 <p class="p5"><br></p>
 165 <p class="p7">// steady tone, because sample accurate.</p>
 166 <p class="p5"><br></p>
 167 <p class="p6">~x.rebuild;</p>
 168 <p class="p5"><br></p>
 169 <p class="p6">r.stop;</p>
 170 <p class="p5"><br></p>
 171 <p class="p6">p.clear; // remove all.<span class="Apple-tab-span">      </span></p>
 172 <p class="p5"><br></p>
 173 <p class="p5"><br></p>
 174 <p class="p5"><br></p>
 175 <p class="p5"><br></p>
 176 <p class="p5"><br></p>
 177 <p class="p4"><span class="s2">previous: <a href="jitlib_basic_concepts_03.html"><span class="s3">jitlib_basic_concepts_03</span></a></span></p>
 178 <p class="p5"><br></p>
 179 <p class="p5"><br></p>
 180 </body>
 181 </html>