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<h2 class="title"><a id="RecentDevelopments"></a>Recent Developments</h2>
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<p>In the time since Barry Vercoe wrote the original Preface to
this manual, printed above, many further contributions have been made
to Csound. CsoundAC is an extended version of Csound 5.</p>
<div class="section" title="Features of Csound 5">
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<h2 class="title" style="clear: both"><a id="newFeaturesInCsound5"></a>Features of Csound 5</h2>
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<p>Csound 5 begins a new major version of Csound that includes the
following new features:</p>
<div class="itemizedlist">
<ul class="itemizedlist" type="disc">
<li class="listitem">Now licensed under the GNU Lesser General Public License, an
open source license.</li>
<li class="listitem">A new, easier to manage build system using
<span class="application">SCons</span>.</li>
<li class="listitem">
<p class="simpara">The use of widely--accepted open source libraries:</p>
<div class="itemizedlist">
<ul class="itemizedlist" type="circle">
<li class="listitem">libsndfile for soundfile input and output.</li>
<li class="listitem">PortAudio with ASIO drivers for low-latency, real-time audio input and output.</li>
<li class="listitem">FLTK for graphical widgets that can be programmed in orchestra code.</li>
<li class="listitem">PortMidi for real-time MIDI input and output.</li>
</ul>
</div>
<p class="simpara">In addition, Istvan Varga has contributed native MIDI and audio drivers for Windows and Linux.</p>
</li>
<li class="listitem">Simplified audio buffering system.</li>
<li class="listitem">Status returns from all internal functions, including opcode functions.</li>
<li class="listitem">MIDI interop opcodes, that enable the same instrument
definitions to be used interchangeably for either live MIDI
performance or off-line, score-driven performance.</li>
<li class="listitem">
<p class="simpara">Plugin opcodes are working and becoming more widely
accepted. Many opcodes have been moved to plugins. Most new opcodes
are plugins, including:</p>
<div class="itemizedlist">
<ul class="itemizedlist" type="circle">
<li class="listitem">The FluidSynth-based SoundFont opcodes.</li>
<li class="listitem">Python opcodes allowing Python code to execute in the
orchestra header or in instrument code, at <code class="literal">i</code>-rate or <code class="literal">k</code>-rate.</li>
<li class="listitem">Loris opcodes for time/frequency analysis and resynthesis.</li>
<li class="listitem">Control bus opcodes.</li>
<li class="listitem">Audio mixer opcodes.</li>
<li class="listitem">String conversion opcodes.</li>
<li class="listitem">Improved Open Sound Control (OSC) opcodes.</li>
<li class="listitem">Vectorial opcodes.</li>
<li class="listitem">The <span class="application">pvs</span> opcodes
for real-time spectral processing, a port of Mark Dolson's
phase vocoder code.</li>
<li class="listitem">The <span class="application">ATS</span> opcodes
for spectral Analysis, Transformation, and Synthesis of sound
based on a sinusoidal plus critical-band noise model. A sound
in ATS is a symbolic object representing a spectral model that
can be sculpted using a variety of transformation
functions. These opcodes can read, transform and resynthesize
ATS analysis files. Please note that you need the ATS
application to produce analysis files.</li>
<li class="listitem">The STK opcodes, consisting of Perry Cook's
original Synthesis Toolkit in C++ instruments, in C++, adapted
as opcodes.</li>
<li class="listitem"><span class="application">DSSI</span>
and <span class="application">LADSPA</span> adapter opcodes for
hosting <span class="application">DSSI</span>
and <span class="application">LADSPA</span> plugins in
Csound.</li>
<li class="listitem"><span class="application">vst4cs</span> VST
adapter opcodes for hosting VST plugins in
Csound. (Distributed in source form only due to the VST SDK
licence restrictions.)</li>
</ul>
</div>
</li>
<li class="listitem">The <code class="filename">OpcodeBase.hpp</code> header file for
writing plugin opcodes in C++. This is based on the technique of
static polymorphism via template inheritance.</li>
<li class="listitem">Istvan Varga's csound5gui frontend for Csound, simplifying
the editing of Csound, the use of Csound especially for live performance,
and the monitoring of performances.</li>
<li class="listitem">Victor Lazzarini's Tcl/Tk frontends for
Csound, <span class="application">cstclsh</span>
and <span class="application">cswish</span>.</li>
<li class="listitem">
<p class="simpara">The Csound API is becoming more standardized
and more widely used. There are interfaces or wrappers
to the API in the following languages:</p>
<div class="itemizedlist">
<ul class="itemizedlist" type="circle">
<li class="listitem">C
(include <code class="literal">csound.h</code>).</li>
<li class="listitem">C++
(include <code class="literal">csound.hpp)</code>). This API includes
Csound score and orchestra file container
functions.</li>
<li class="listitem">Python (<code class="literal">import
csnd</code>).</li>
<li class="listitem">Java (<code class="literal">import
csnd.*;</code>).</li>
<li class="listitem">Lua (<code class="literal">require
"csnd";</code>).</li>
<li class="listitem">Lisp (use the CFFI
file <code class="literal">csound5.lisp</code>).</li>
</ul>
</div>
</li>
<li class="listitem">Csound is now truly re-entrant, meaning that
multiple instances of Csound can run at the same time, in the same
process.</li>
</ul>
</div>
<p>John ffitch plans to replace the handwritten parser with one
written using a parser generator, which should make it more
bug-free and perhaps more efficient.</p>
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media
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