Help/UGens/Playback and Recording/Warp1.html

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  27 <p class="p1"><b>Warp1<span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>Warp a buffer with a time pointer</b></p>
  28 <p class="p2"><br></p>
  29 <p class="p3">Inspired by Chad Kirby's SuperCollider2 Warp1 class, which was inspired by Richard Karpen's sndwarp for CSound. A granular time strecher and pitchshifter.</p>
  30 <p class="p2"><br></p>
  31 <p class="p3"><b>Warp1.ar(numChannels, bufnum, pointer, freqScale, windowSize, envbufnum, overlaps,<span class="Apple-converted-space"> </span></b></p>
  32 <p class="p3"><b><span class="Apple-tab-span">  </span><span class="Apple-tab-span">    </span>windowRandRatio, interp, mul, add)</b></p>
  33 <p class="p2"><br></p>
  34 <p class="p3"><span class="Apple-tab-span">     </span><b>numChannels</b> - the number of channels in the soundfile used in bufnum.</p>
  35 <p class="p3"><span class="Apple-tab-span">     </span><b>bufnum</b> - the buffer number of a mono soundfile.</p>
  36 <p class="p3"><span class="Apple-tab-span">     </span><b>pointer</b> - the position in the buffer.<span class="Apple-converted-space">  </span>The value should be between 0 and 1, with 0 being the begining</p>
  37 <p class="p3"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>of the buffer, and 1 the end.</p>
  38 <p class="p3"><span class="Apple-tab-span">     </span><b>freqScale</b>- the amount of frequency shift. 1.0 is normal, 0.5 is one octave down, 2.0 is one octave up.</p>
  39 <p class="p3"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>Negative values play the soundfile backwards.</p>
  40 <p class="p3"><span class="Apple-tab-span">     </span><b>windowSIze</b> - the size of each grain window.</p>
  41 <p class="p3"><b><span class="Apple-tab-span">  </span>envbufnum</b> - the buffer number containing a singal to use for the grain envelope. -1 uses a built-in<span class="Apple-converted-space"> </span></p>
  42 <p class="p3"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>Hanning envelope.</p>
  43 <p class="p3"><span class="Apple-tab-span">     </span><b>overlaps</b> - the number of overlaping windows.</p>
  44 <p class="p3"><b><span class="Apple-tab-span">  </span>windowRandRatio </b>- the amount of randomness to the windowing function.<span class="Apple-converted-space">  </span>Must be between 0 (no</p>
  45 <p class="p3"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>randomness) to 1.0 (probably to random actually)</p>
  46 <p class="p3"><b><span class="Apple-tab-span">  </span>interp -<i> </i></b>the interpolation method used for pitchshifting grains. 1 = no interpolation. 2 = linear.<span class="Apple-converted-space"> </span></p>
  47 <p class="p3"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>4 = cubic interpolation (more computationally intensive).</p>
  48 <p class="p2"><br></p>
  49 <p class="p2"><br></p>
  50 <p class="p3"><b>Examples:</b></p>
  51 <p class="p4"><br></p>
  52 <p class="p5">s.boot;</p>
  53 <p class="p4"><br></p>
  54 <p class="p5">(</p>
  55 <p class="p5"><span class="s1">var</span> winenv;</p>
  56 <p class="p6">// a custom envelope - not a very good one, but you can hear the difference between this<span class="Apple-converted-space"> </span></p>
  57 <p class="p6">// and the default</p>
  58 <p class="p5">winenv = <span class="s1">Env</span>([0, 1, 0], [0.5, 0.5], [8, -8]);</p>
  59 <p class="p7"><span class="s2">b = </span><span class="s1">Buffer</span><span class="s2">.read(s, </span>"sounds/a11wlk01-44_1.aiff"<span class="s2">);</span></p>
  60 <p class="p5">z = <span class="s1">Buffer</span>.sendCollection(s, winenv.discretize, 1);</p>
  61 <p class="p4"><br></p>
  62 <p class="p5"><span class="s1">SynthDef</span>(<span class="s3">\warp</span>, {<span class="s1">arg</span> buffer = 0, envbuf = -1;</p>
  63 <p class="p5"><span class="Apple-tab-span">     </span><span class="s1">var</span> out, pointer, filelength, pitch, env, dir;</p>
  64 <p class="p6"><span class="s2"><span class="Apple-tab-span">    </span></span>// pointer - move from beginning to end of soundfile over 15 seconds</p>
  65 <p class="p5"><span class="Apple-tab-span">     </span>pointer = <span class="s1">Line</span>.kr(0, 1, 15);</p>
  66 <p class="p6"><span class="s2"><span class="Apple-tab-span">    </span></span>// control pitch with MouseX</p>
  67 <p class="p5"><span class="Apple-tab-span">     </span>pitch = <span class="s1">MouseX</span>.kr(0.5, 2);</p>
  68 <p class="p5"><span class="Apple-tab-span">     </span>env = <span class="s1">EnvGen</span>.kr(<span class="s1">Env</span>([0.001, 1, 1, 0.001], [0.1, 14, 0.9], <span class="s3">'exp'</span>), doneAction: 2);</p>
  69 <p class="p5"><span class="Apple-tab-span">     </span>out = <span class="s1">Warp1</span>.ar(1, buffer, pointer, pitch, 0.1, envbuf, 8, 0.1, 2);</p>
  70 <p class="p5"><span class="Apple-tab-span">     </span><span class="s1">Out</span>.ar(0, out * env);</p>
  71 <p class="p5">}).send(s);</p>
  72 <p class="p4"><br></p>
  73 <p class="p5">)</p>
  74 <p class="p4"><br></p>
  75 <p class="p8">// use built-in env</p>
  76 <p class="p5">x = <span class="s4">Synth</span>(<span class="s5">\warp</span>, [<span class="s5">\buffer</span>, b, <span class="s5">\envbuf</span>, -1])</p>
  77 <p class="p4"><br></p>
  78 <p class="p8">// switch to the custom env</p>
  79 <p class="p5">x.set(<span class="s5">\envbuf</span>, z)</p>
  80 <p class="p5">x.set(<span class="s5">\envbuf</span>, -1);</p>
  81 <p class="p4"><br></p>
  82 <p class="p5">x.free;</p>
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