File: 01-simple-sequences.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-- 11,854 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>01-simple-sequences.py - Looping over a list of values. — 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="02-parameters.html" rel="next" title="02-parameters.py - Built-in arguments and conversions."/>
<link href="index.html" rel="prev" title="22-events"/>
</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="index.html" title="22-events">previous</a> |
          <a accesskey="N" href="02-parameters.html" title="02-parameters.py - Built-in arguments and conversions.">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="simple-sequences-py-looping-over-a-list-of-values">
<h1>01-simple-sequences.py - Looping over a list of values.<a class="headerlink" href="#simple-sequences-py-looping-over-a-list-of-values" title="Permalink to this heading">¶</a></h1>
<p>The purpose of the Events framework is to allow the user to generate a
sequence of events with as few as possible parameters to specify.</p>
<p>The Events object is at the heart of the framework. An Events object
compute parameters, generally designed with event generator objects,
build the events and play the sequence.</p>
<p>The framework provides a default instrument to play the sequence. We’ll
see later how to build our own synthesizers and use them to play the events.</p>
<section id="eventseq">
<h2>EventSeq<a class="headerlink" href="#eventseq" title="Permalink to this heading">¶</a></h2>
<p>The basic event generator is EventSeq, which loop over a list of values:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">e</span> <span class="o">=</span> <span class="n">Events</span><span class="p">(</span><span class="n">freq</span> <span class="o">=</span> <span class="n">EventSeq</span><span class="p">([</span><span class="mi">250</span><span class="p">,</span> <span class="mi">300</span><span class="p">,</span> <span class="mi">350</span><span class="p">,</span> <span class="mi">400</span><span class="p">]))</span><span class="o">.</span><span class="n">play</span><span class="p">()</span>
</pre></div>
</div>
<p>EventSeq has an “occurrences” keyword, which can be used to fix how many
times we want to play the sequence of values. The default value is ‘inf’,
which means loop forever:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="c1"># This one stops after playing twice the sequence.</span>
<span class="n">e1</span> <span class="o">=</span> <span class="n">Events</span><span class="p">(</span><span class="n">freq</span> <span class="o">=</span> <span class="n">EventSeq</span><span class="p">([</span><span class="mi">500</span><span class="p">,</span> <span class="mi">600</span><span class="p">,</span> <span class="mi">700</span><span class="p">,</span> <span class="mi">800</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="o">.</span><span class="n">play</span><span class="p">()</span>
</pre></div>
</div>
<p>When an Events’s parameter is given a list or a single value, it is
internally converted to an EventSeq. This is the same as the first example:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">e2</span> <span class="o">=</span> <span class="n">Events</span><span class="p">(</span><span class="n">freq</span> <span class="o">=</span> <span class="p">[</span><span class="mi">250</span><span class="p">,</span> <span class="mi">300</span><span class="p">,</span> <span class="mi">350</span><span class="p">,</span> <span class="mi">400</span><span class="p">])</span>
</pre></div>
</div>
</section>
<section id="complete-example">
<h2>Complete Example<a class="headerlink" href="#complete-example" title="Permalink to this heading">¶</a></h2>
<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>
<span class="n">s</span><span class="o">.</span><span class="n">amp</span> <span class="o">=</span> <span class="mf">0.25</span>

<span class="c1"># Simple infinite sequence.</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">freq</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">250</span><span class="p">,</span> <span class="mi">300</span><span class="p">,</span> <span class="mi">350</span><span class="p">,</span> <span class="mi">400</span><span class="p">]))</span><span class="o">.</span><span class="n">play</span><span class="p">()</span>

<span class="c1"># This will play the same note forever.</span>
<span class="n">e3</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">freq</span><span class="o">=</span><span class="mi">200</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>
</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="index.html" title="22-events">previous</a> |
            <a href="02-parameters.html" title="02-parameters.py - Built-in arguments and conversions.">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>