File: 12-sharing-values.html

package info (click to toggle)
python-pyo 1.0.6-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 52,332 kB
  • sloc: python: 135,133; ansic: 127,822; javascript: 16,116; sh: 395; makefile: 388; cpp: 242
file content (160 lines) | stat: -rw-r--r-- 15,740 bytes parent folder | download | duplicates (2) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
 

<!DOCTYPE html>

<html lang="en">
<head>
<meta charset="utf-8"/>
<meta content="width=device-width, initial-scale=1.0" name="viewport"/><meta content="Docutils 0.17.1: http://docutils.sourceforge.net/" name="generator"/>
<title>12-sharing-values.py - Reading and using other parameter’s value. — Pyo 1.0.5 documentation</title>
<link href="../../_static/pygments.css" rel="stylesheet" type="text/css"/>
<link href="../../_static/agogo.css" rel="stylesheet" type="text/css"/>
<link href="../../_static/sphinx-codeautolink.css" rel="stylesheet" type="text/css"/>
<link href="../../_static/autoclasstoc.css" rel="stylesheet" type="text/css"/>
<script data-url_root="../../" id="documentation_options" src="../../_static/documentation_options.js"></script>
<script src="../../_static/jquery.js"></script>
<script src="../../_static/underscore.js"></script>
<script src="../../_static/_sphinx_javascript_frameworks_compat.js"></script>
<script src="../../_static/doctools.js"></script>
<script src="../../_static/sphinx_highlight.js"></script>
<link href="../../_static/E-PyoIcon.ico" rel="shortcut icon"/>
<link href="../../about.html" rel="author" title="About these documents"/>
<link href="../../genindex.html" rel="index" title="Index"/>
<link href="../../search.html" rel="search" title="Search"/>
<link href="13-using-audio-objects.html" rel="next" title="13-using-audio-objects.py - Using audio objects as generators."/>
<link href="11-filters.html" rel="prev" title="11-filters.py - Modifying generator’s output with filters."/>
</head><body>
<div class="header-wrapper" role="banner">
<div class="header">
<div class="headertitle"><a href="../../index.html">Pyo 1.0.5 documentation</a></div>
<div aria-label="related navigation" class="rel" role="navigation">
<a accesskey="P" href="11-filters.html" title="11-filters.py - Modifying generator’s output with filters.">previous</a> |
          <a accesskey="N" href="13-using-audio-objects.html" title="13-using-audio-objects.py - Using audio objects as generators.">next</a> |
          <a accesskey="I" href="../../genindex.html" title="General Index">index</a>
</div>
</div>
</div>
<div class="content-wrapper">
<div class="content">
<div class="sidebar">
<h3>Table of Contents</h3>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../../about.html">About pyo</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../download.html">Installing pyo with pip</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../compiling.html">Compiling pyo from sources</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../structure.html">Structure of the library</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../gettingstarted.html">Getting started</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../winaudioinspect.html">Configuring the audio output (Windows)</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../perftips.html">Improve performance of pyo programs</a></li>
</ul>
<ul class="current">
<li class="toctree-l1"><a class="reference internal" href="../../api/index.html">API documentation</a></li>
<li class="toctree-l1 current"><a class="reference internal" href="../index.html">Examples</a><ul class="current">
<li class="toctree-l2"><a class="reference internal" href="../01-intro/index.html">First steps</a></li>
<li class="toctree-l2"><a class="reference internal" href="../02-controls/index.html">Parameter control</a></li>
<li class="toctree-l2"><a class="reference internal" href="../03-generators/index.html">Synthesis generators</a></li>
<li class="toctree-l2"><a class="reference internal" href="../04-soundfiles/index.html">Playing with soundfiles</a></li>
<li class="toctree-l2"><a class="reference internal" href="../05-envelopes/index.html">Amplitude envelopes</a></li>
<li class="toctree-l2"><a class="reference internal" href="../06-filters/index.html">Filtering</a></li>
<li class="toctree-l2"><a class="reference internal" href="../07-effects/index.html">Creating sound effects</a></li>
<li class="toctree-l2"><a class="reference internal" href="../08-dynamics/index.html">Dynamic range of audio signals</a></li>
<li class="toctree-l2"><a class="reference internal" href="../09-callbacks/index.html">Calling python functions from audio objects</a></li>
<li class="toctree-l2"><a class="reference internal" href="../10-tables/index.html">Using tables</a></li>
<li class="toctree-l2"><a class="reference internal" href="../16-midi/index.html">How to use MIDI with pyo</a></li>
<li class="toctree-l2"><a class="reference internal" href="../17-osc/index.html">How to use OSC with pyo</a></li>
<li class="toctree-l2"><a class="reference internal" href="../19-multirate/index.html">Multirate audio processing</a></li>
<li class="toctree-l2"><a class="reference internal" href="../20-multicore/index.html">Multicore audio programming</a></li>
<li class="toctree-l2"><a class="reference internal" href="../21-utilities/index.html">Utilities</a></li>
<li class="toctree-l2 current"><a class="reference internal" href="index.html">Events framework</a></li>
<li class="toctree-l2"><a class="reference internal" href="../23-expression/index.html">Evaluating prefix expression</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../../tutorials/index.html">Advanced tutorials</a></li>
</ul>
<div role="search">
<h3 style="margin-top: 1.5em;">Search</h3>
<form action="../../search.html" class="search" method="get">
<input name="q" type="text"/>
<input type="submit" value="Go"/>
</form>
</div>
</div>
<div class="document">
<div class="documentwrapper">
<div class="bodywrapper">
<div class="body" role="main">
<section id="sharing-values-py-reading-and-using-other-parameter-s-value">
<h1>12-sharing-values.py - Reading and using other parameter’s value.<a class="headerlink" href="#sharing-values-py-reading-and-using-other-parameter-s-value" title="Permalink to this heading">¶</a></h1>
<p>So far, we’ve seen events that are independent of each other. They
are not aware of the data produced by the others. Making these data
available adds musical intelligence to our processes. There is two
ways to share values with events. The first one is to read a value
produced by the same Events object where we want to use it. The
second way is to read the data from a parameter of another Events
object.</p>
<p>In both cases, if the parameter that is read is not yet processed by
the Events object, it will first be computed, and stored for further
uses, and then shared.</p>
<p>We use the <cite>EventKey(key, master=None)</cite> to read the value of another
parameter.</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <a class="sphinx-codeautolink-a" href="../../api/alphabetical.html#module-pyo" title="pyo"><span class="nn">pyo</span></a> <span class="kn">import</span> <span class="o">*</span>

<span class="n">s</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/server.html#pyo.Server" title="pyo.lib.server.Server"><span class="n">Server</span></a><span class="p">()</span><span class="o">.</span><span class="n">boot</span><span class="p">()</span>

<a class="sphinx-codeautolink-a" href="../../api/classes/events.html#pyo.EventScale" title="pyo.lib.events.EventScale"><span class="n">scl</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/events.html#pyo.EventScale" title="pyo.lib.events.EventScale"><span class="n">EventScale</span></a><span class="p">(</span><span class="n">root</span><span class="o">=</span><span class="s2">"C"</span><span class="p">,</span> <span class="n">scale</span><span class="o">=</span><span class="s2">"major"</span><span class="p">,</span> <span class="n">first</span><span class="o">=</span><span class="mi">4</span><span class="p">,</span> <span class="n">octaves</span><span class="o">=</span><span class="mi">3</span><span class="p">)</span>

<span class="n">e</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/events.html#pyo.Events" title="pyo.lib.events.Events"><span class="n">Events</span></a><span class="p">(</span>
    <span class="n">midinote</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/events.html#pyo.EventDrunk" title="pyo.lib.events.EventDrunk"><span class="n">EventDrunk</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/events.html#pyo.EventScale" title="pyo.lib.events.EventScale"><span class="n">scl</span></a><span class="p">,</span> <span class="n">maxStep</span><span class="o">=</span><span class="mi">2</span><span class="p">),</span>
    <span class="c1"># The higher the pitch, the lower the amplitude.</span>
    <span class="n">db</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/events.html#pyo.EventKey" title="pyo.lib.events.EventKey"><span class="n">EventKey</span></a><span class="p">(</span><span class="s2">"midinote"</span><span class="p">)</span><span class="o">.</span><span class="n">rescale</span><span class="p">(</span><span class="mi">48</span><span class="p">,</span> <span class="mi">84</span><span class="p">,</span> <span class="o">-</span><span class="mi">3</span><span class="p">,</span> <span class="o">-</span><span class="mi">24</span><span class="p">,</span> <span class="mi">1</span><span class="p">),</span>
    <span class="n">beat</span><span class="o">=</span><span class="mi">1</span> <span class="o">/</span> <span class="mf">4.0</span><span class="p">,</span>
    <span class="n">transpo</span><span class="o">=</span><span class="mi">12</span><span class="p">,</span>
    <span class="n">attack</span><span class="o">=</span><span class="mf">0.001</span><span class="p">,</span>
    <span class="n">decay</span><span class="o">=</span><span class="mf">0.05</span><span class="p">,</span>
    <span class="n">sustain</span><span class="o">=</span><span class="mf">0.5</span><span class="p">,</span>
    <span class="n">release</span><span class="o">=</span><span class="mf">0.005</span><span class="p">,</span>
<span class="p">)</span><span class="o">.</span><span class="n">play</span><span class="p">()</span>

<span class="n">e2</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/events.html#pyo.Events" title="pyo.lib.events.Events"><span class="n">Events</span></a><span class="p">(</span>  <span class="c1"># Define arguments (unused in the instrument) to build phrases.</span>
    <span class="n">line1</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/events.html#pyo.EventSeq" title="pyo.lib.events.EventSeq"><span class="n">EventSeq</span></a><span class="p">([</span><span class="mi">0</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">6</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">2</span><span class="p">],</span> <span class="n">occurrences</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">stopEventsWhenDone</span><span class="o">=</span><span class="kc">False</span><span class="p">),</span>
    <span class="n">line2</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/events.html#pyo.EventSeq" title="pyo.lib.events.EventSeq"><span class="n">EventSeq</span></a><span class="p">([</span><span class="mi">0</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">5</span><span class="p">,</span> <span class="mi">6</span><span class="p">,</span> <span class="mi">5</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">1</span><span class="p">],</span> <span class="n">occurrences</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">stopEventsWhenDone</span><span class="o">=</span><span class="kc">False</span><span class="p">),</span>
    <span class="c1"># Use previously defined arguments to create a sequence of pitch phrases.</span>
    <span class="n">midinote</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/events.html#pyo.EventIndex" title="pyo.lib.events.EventIndex"><span class="n">EventIndex</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/events.html#pyo.EventScale" title="pyo.lib.events.EventScale"><span class="n">scl</span></a><span class="p">,</span> <a class="sphinx-codeautolink-a" href="../../api/classes/events.html#pyo.EventSeq" title="pyo.lib.events.EventSeq"><span class="n">EventSeq</span></a><span class="p">([</span><a class="sphinx-codeautolink-a" href="../../api/classes/events.html#pyo.EventKey" title="pyo.lib.events.EventKey"><span class="n">EventKey</span></a><span class="p">(</span><span class="s2">"line1"</span><span class="p">),</span> <a class="sphinx-codeautolink-a" href="../../api/classes/events.html#pyo.EventKey" title="pyo.lib.events.EventKey"><span class="n">EventKey</span></a><span class="p">(</span><span class="s2">"line2"</span><span class="p">)])),</span>
    <span class="c1"># Use the db amplitude from the previous Events object (`master` argument).</span>
    <span class="n">db</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/events.html#pyo.EventKey" title="pyo.lib.events.EventKey"><span class="n">EventKey</span></a><span class="p">(</span><span class="s2">"db"</span><span class="p">,</span> <span class="n">master</span><span class="o">=</span><span class="n">e</span><span class="p">),</span>
    <span class="n">beat</span><span class="o">=</span><span class="mi">1</span> <span class="o">/</span> <span class="mf">4.0</span><span class="p">,</span>
<span class="p">)</span><span class="o">.</span><span class="n">play</span><span class="p">()</span>

<span class="n">s</span><span class="o">.</span><span class="n">gui</span><span class="p">(</span><span class="nb">locals</span><span class="p">())</span>
</pre></div>
</div>
</section>
<div class="clearer"></div>
</div>
</div>
</div>
</div>
<div class="clearer"></div>
</div>
</div>
<div class="footer-wrapper">
<div class="footer">
<div class="left">
<div aria-label="related navigaton" role="navigation">
<a href="11-filters.html" title="11-filters.py - Modifying generator’s output with filters.">previous</a> |
            <a href="13-using-audio-objects.html" title="13-using-audio-objects.py - Using audio objects as generators.">next</a> |
            <a href="../../genindex.html" title="General Index">index</a>
</div>
<div aria-label="source link" role="note">
</div>
</div>
<div class="right">
<div class="footer" role="contentinfo">
        © Copyright 2021, Olivier Bélanger.
      Created using <a href="https://www.sphinx-doc.org/">Sphinx</a> 5.3.0.
    </div>
</div>
<div class="clearer"></div>
</div>
</div>
</body>
</html>