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<div class="title">frei0r - a minimalistic plugin API for video effects </div>  </div>
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<div class="textblock"><h1><a class="anchor" id="sec_intro"></a>
Introduction</h1>
<p>This is frei0r - a minimalistic plugin API for video effects.</p>
<p>The main emphasis is on simplicity - there are many different applications that use video effects, and they all have different requirements regarding their internal plugin API. And that's why frei0r does not try to be a one-in-all general video plugin API, but instead an API for the most common video effects: simple filters, sources and mixers that can be controlled by parameters.</p>
<p>It's our hope that this way these simple effects can be shared between many applications, avoiding their reimplementation by different projects.</p>
<p>On the other hand, this is not meant as a competing standard to more ambitious efforts that try to satisfy the needs of many different applications and more complex effects.</p>
<h1><a class="anchor" id="sec_overview"></a>
Overview</h1>
<p>If you are new to frei0r, the best thing is probably to have a look at the <a href="frei0r_8h-source.html">frei0r header</a>, which is quite simple.</p>
<p>After that, you might want to look at the <a href="frei0r_8h.html">frei0r functions</a> in more detail.</p>
<p>When developing a new frei0r effect, you have to choose</p><ul>
<li>which effect type to use (<a class="el" href="group___p_l_u_g_i_n___t_y_p_e.html">Type of the Plugin</a>),</li>
<li>which color model to use (<a class="el" href="group___c_o_l_o_r___m_o_d_e_l.html">Color Models</a>), and</li>
<li>which parameter types (<a class="el" href="group___p_a_r_a_m___t_y_p_e.html">Parameter Types</a>) your effect will support.</li>
</ul>
<p>To round things up, you should decide whether your effect should have an associated icon (<a class="el" href="group__icons.html">Icons for frei0r effects</a>), and where it will be installed (<a class="el" href="group__pluglocations.html">Plugin Locations</a>).</p>
<h1><a class="anchor" id="sec_changes"></a>
Changes</h1>
<h2><a class="anchor" id="sec_changes_1_1_1_2"></a>
From frei0r 1.1 to frei0r 1.2</h2>
<ul>
<li>make &lt;vendor&gt; in plugin path optional</li>
<li>added section on FREI0R_PATH environment variable</li>
<li>added requirement to initialize all parameters in <a class="el" href="frei0r_8h.html#ac7765bbd77add97b318c09e2aba0724b">f0r_construct()</a></li>
</ul>
<h2><a class="anchor" id="sec_changes_1_0_1_1"></a>
From frei0r 1.0 to frei0r 1.1</h2>
<ul>
<li>added specifications for plugin locations</li>
<li>added specifications for frei0r icons</li>
<li>added RGBA8888 color model</li>
<li>added packed32 color model</li>
<li>added better specification of color models</li>
<li>added string type</li>
<li>added bounds to resolution (8 &lt;= width, height &lt;= 2048)</li>
<li>width and height must be an integer multiple of 8</li>
<li>frame data must be 16 byte aligned</li>
<li>improved update specification (must not change parameters, must restore fpu state)</li>
<li>added note for applications to ignore effects with unknown fields</li>
<li>added new plugin types mixer2 and mixer3</li>
<li>added section about <a class="el" href="group__concurrency.html">Concurrency</a> </li>
</ul>
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