Help/UGens/Synth control/Demand Rate/Dbufwr.html

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  26 <p class="p1"><span class="s1"><b>Dbufwr</b></span><span class="s2"><span class="Apple-tab-span">       </span><span class="Apple-tab-span">    </span></span><b> buffer demand ugen</b></p>
  27 <p class="p2"><br></p>
  28 <p class="p1">superclass: DUGen</p>
  29 <p class="p3"><br></p>
  30 <p class="p3"><br></p>
  31 <p class="p1"><b>*new(input, bufnum, phase, loop)</b></p>
  32 <p class="p3"><br></p>
  33 <p class="p1">all inputs can be either demand ugen or any other ugen.</p>
  34 <p class="p3"><br></p>
  35 <p class="p1"><b>input</b><span class="Apple-tab-span"> </span>single channel input</p>
  36 <p class="p1"><b>bufnum</b><span class="Apple-tab-span">        </span>buffer number to read from (single channel buffer)</p>
  37 <p class="p1"><b>phase</b><span class="Apple-tab-span"> </span>index into the buffer</p>
  38 <p class="p1"><b>loop</b><span class="Apple-tab-span">  </span><span class="Apple-tab-span">    </span>when phase exceeds number of frames in buffer, loops when set to 1 (default :1)</p>
  39 <p class="p3"><br></p>
  40 <p class="p1">see also [<a href="Dbufrd.html"><span class="s3">Dbufrd</span></a>]</p>
  41 <p class="p2"><span class="Apple-tab-span">     </span></p>
  42 <p class="p2"><br></p>
  43 <p class="p4">// alloc a single channel buffer</p>
  44 <p class="p5">b = <span class="s4">Buffer</span>.alloc(s, 24, 1);</p>
  45 <p class="p5">b.setn(0, { 210 } ! b.numFrames);</p>
  46 <p class="p2"><br></p>
  47 <p class="p4">// post some info:</p>
  48 <p class="p5">fork { loop { 0.5.wait; b.getn(0, b.numFrames, {<span class="s4">|x|</span> x.postln }) } };</p>
  49 <p class="p2"><br></p>
  50 <p class="p4">// write demand sequence into a buffer</p>
  51 <p class="p5">(</p>
  52 <p class="p5">{</p>
  53 <p class="p5"><span class="s4">var</span> read, write, readpos, writepos, writetrig;</p>
  54 <p class="p2"><br></p>
  55 <p class="p5"><span class="Apple-tab-span">     </span>writetrig = <span class="s4">Dust</span>.kr(1);</p>
  56 <p class="p5"><span class="Apple-tab-span">     </span>readpos = <span class="s4">Dseries</span>(0, 1, <span class="s4">inf</span>);</p>
  57 <p class="p5"><span class="Apple-tab-span">     </span>writepos = <span class="s4">Dseq</span>([<span class="s4">Dseries</span>(0, 3, 30), <span class="s4">Dseries</span>(0, 1, 30)], <span class="s4">inf</span>);</p>
  58 <p class="p2"><br></p>
  59 <p class="p5"><span class="Apple-tab-span">     </span>read = <span class="s4">Dbufrd</span>(b, readpos);</p>
  60 <p class="p5"><span class="Apple-tab-span">     </span>write = <span class="s4">Dbufwr</span>(<span class="s4">Dseq</span>([<span class="s4">Dseries</span>(1, 1, 16), <span class="s4">Dwhite</span>(1, 16, 8)], <span class="s4">inf</span>) * 60, b, writepos);</p>
  61 <p class="p2"><br></p>
  62 <p class="p5"><span class="Apple-tab-span">     </span><span class="s4">Demand</span>.kr(writetrig, 0, write); <span class="s5">// write on trigger</span></p>
  63 <p class="p2"><br></p>
  64 <p class="p6"><span class="s6"><span class="Apple-tab-span">    </span></span>SinOsc<span class="s6">.ar(</span></p>
  65 <p class="p5"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s4">Demand</span>.kr(<span class="s4">Impulse</span>.kr(16), 0, read).lag(0.01) * [1, 1.01]</p>
  66 <p class="p5"><span class="Apple-tab-span">     </span>) * 0.1</p>
  67 <p class="p2"><br></p>
  68 <p class="p5">}.play;</p>
  69 <p class="p5">)</p>
  70 <p class="p2"><br></p>
  71 <p class="p2"><br></p>
  72 <p class="p2"><br></p>
  73 <p class="p4">// write into buffer with mouse clicks</p>
  74 <p class="p5">(</p>
  75 <p class="p5">{</p>
  76 <p class="p4"><span class="s6"><span class="Apple-tab-span">    </span></span><span class="s4">var</span><span class="s6"> val = </span><span class="s4">MouseY</span><span class="s6">.kr(1000, 200, 1); </span>// cursor y pos controls frequency</p>
  77 <p class="p4"><span class="s6"><span class="Apple-tab-span">    </span></span><span class="s4">var</span><span class="s6"> pos = </span><span class="s4">MouseX</span><span class="s6">.kr(0, </span><span class="s4">BufFrames</span><span class="s6">.kr(b) - 1); </span>// cursor x position controls buffer pos</p>
  78 <p class="p4"><span class="s6"><span class="Apple-tab-span">    </span></span><span class="s4">var</span><span class="s6"> write = </span><span class="s4">MouseButton</span><span class="s6">.kr; </span>// button controls write action</p>
  79 <p class="p5"><span class="Apple-tab-span">     </span><span class="s4">Demand</span>.kr(write, 0, <span class="s4">Dbufwr</span>(val, b, pos, 1));</p>
  80 <p class="p6"><span class="s6"><span class="Apple-tab-span">    </span></span>SinOsc<span class="s6">.ar(</span></p>
  81 <p class="p5"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s4">Duty</span>.kr(<span class="s4">Dseq</span>([0.5, 0.75, 0.5, 1.0], <span class="s4">inf</span>) * 0.2, 0, <span class="s4">Dbufrd</span>(b, <span class="s4">Dseries</span>(0, 1, <span class="s4">inf</span>)))</p>
  82 <p class="p5"><span class="Apple-tab-span">     </span>) * 0.1</p>
  83 <p class="p5">}.play;</p>
  84 <p class="p5">)</p>
  85 <p class="p2"><br></p>
  86 <p class="p2"><br></p>
  87 <p class="p2"><br></p>
  88 <p class="p2"><br></p>
  89 <p class="p2"><br></p>
  90 <p class="p2"><br></p>
  91 <p class="p4">// write demand sequence into a buffer</p>
  92 <p class="p5">b.free; b = <span class="s4">Buffer</span>.alloc(s, 2, 1);</p>
  93 <p class="p5">fork { loop { 0.5.wait; b.getn(0, b.numFrames, {<span class="s4">|x|</span> x.postln }) } };</p>
  94 <p class="p5">b.setn(0, [1, 0]);</p>
  95 <p class="p2"><br></p>
  96 <p class="p5">(</p>
  97 <p class="p5">{</p>
  98 <p class="p5"><span class="s4">var</span> read, write, readpos, writepos, writetrig;</p>
  99 <p class="p2"><br></p>
 100 <p class="p5"><span class="Apple-tab-span">     </span>writetrig = <span class="s4">Impulse</span>.kr(2);</p>
 101 <p class="p4"><span class="s6"><span class="Apple-tab-span">    </span>readpos = </span><span class="s4">Dbufrd</span><span class="s6">(b, 1); </span>// first buffer val is position</p>
 102 <p class="p4"><span class="s6"><span class="Apple-tab-span">    </span>writepos = </span><span class="s4">Dbufrd</span><span class="s6">(b, 0); </span>// second buffer val is position</p>
 103 <p class="p5"><span class="Apple-tab-span">     </span>read = <span class="s4">Dbufrd</span>(b, readpos);</p>
 104 <p class="p2"><br></p>
 105 <p class="p5"><span class="Apple-tab-span">     </span>write = <span class="s4">Dbufwr</span>(read, b, writepos);</p>
 106 <p class="p2"><br></p>
 107 <p class="p5"><span class="Apple-tab-span">     </span><span class="s4">Demand</span>.kr(writetrig, 0, write); <span class="s5">// write on trigger</span></p>
 108 <p class="p5">}.play;</p>
 109 <p class="p5">)</p>
 110 <p class="p2"><br></p>
 111 <p class="p2"><br></p>
 112 <p class="p4">// free buffer:</p>
 113 <p class="p5">b.free;</p>
 114 <p class="p2"><br></p>
 115 <p class="p2"><br></p>
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