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<TITLE>The MP4-SA Book: Part III: Instrument Control</TITLE>
<META name="keywords" content="MP4-SA, SAOL, language,
MIDI, SASL, instr, extend, turnoff, time, dur, itime,
released, cpuload, instr, control, table, end, tempo,
preset, MIDIctrl, MIDIbend, MIDItouch, channel, preset,
extended channel number">
<META name="description" content="Instrument control
in MP4-SA. Using the SASL score language to control SAOL
programs. Using MIDI files and MIDI commands to control
SAOL programs. Launching instruments within SAOL, and
controlling the duration of instruments dynamically in
SAOL.">
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<A HREF="../../index.html">mp4-sa</A>-><A HREF="../index.html">
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<H3>From <A HREF="../index.html">The MPEG-4 Structured Audio Book</A>
by <A HREF="http://www.cs.berkeley.edu/~lazzaro/index.html">
John Lazzaro</A> and <A HREF="http://www.cs.berkeley.edu/~johnw">
John Wawrzynek.</A></H3>
<H1>Part III: Instrument Control</H1>
<TABLE WIDTH="100%" CELLPADDING=12 CELLSPACING=0>
<TR>
<TD WIDTH="45%" VALIGN=top BGCOLOR="#CCFFCC">
<H2>Introduction</H2>
<P>
MPEG-4 Structured Audio (MP4-SA) is an ISO/IEC standard (edited by
Eric Scheirer) that specifies sound not as audio data, but as a
computer program that generates audio when run.
<P>
For an introduction to MP4-SA see the <A
HREF="../tut/index.html">introductory tutorial</A> presented in Part I
of the book. For a complete description of the SAOL language, see <A
HREF="../saol/index.html">Part II</A>.
<P>
In Part III of the book, we focus on instrument control in MP4-SA.
A SAOL program may be controlled by score lines of the SASL
language, or by MIDI commands.
<P>
In addition, algorithmic compositions may be written completely in
SAOL, by executing language statements for instantiating and
terminating instruments.
<P>
In the <A HREF="sasl/index.html">first chapter</A> we describe the
SASL score language. We explain the five SASL command types, and
discuss how SASL commands may be distributed throughout an MP4 file.
<P>
In the <A HREF="midi/index.html">second chapter</A> we describe MIDI
instrument control. We review MIDI and MIDI files. We show
how SAOL instruments are tagged with MIDI preset numbers, and explain
the MIDI-oriented standard names.
<P>
In the <A HREF="saolc/index.html">third chapter</A> we describe
how a SAOL instrument may dynamically instantiate new instruments.
We also describe standard names an instrument may use to monitor
its own status, and statements an instrument may use to change that
status. This chapter also includes a chart showing the order of execution
of a SAOL program, to clarify the concept of instrument status.
<P>
<B>Next:</B>Part III/1: <A HREF="sasl/index.html">
The SASL Control Language</A>
</TD>
<TD WIDTH="55%" VALIGN=top BGCOLOR="#FFCCCC">
<H2>Part III: Table of Contents</H2>
<H4>1. <A HREF="sasl/index.html">The SASL Score Language</A></H4>
<UL>
<LI>
<B><A HREF="sasl/index.html#sasl">SASL Scores</A>.</B> Triggering semantics.
<LI>
<B><A HREF="sasl/index.html#instr">Instr Command</A>.</B> Creating instances of
instruments.
<LI>
<B><A HREF="sasl/index.html#control">Control Command</A>.</B> Changing SAOL
variables.
<LI>
<B><A HREF="sasl/index.html#tempo">Tempo and End Commands</A>.</B> Changing
simulation behavior.
<LI>
<B><A HREF="sasl/index.html#table">Table Command</A>.</B> Updating wavetables using SASL.
<LI>
<B><A HREF="sasl/index.html#stream">Streaming and SASL</A>.</B> Real-time flags for SASL.</B>
</UL>
<H4>2. <A HREF="midi/index.html">MIDI Instrument Control</A></H4>
<UL>
<LI>
<B><A HREF="midi/index.html#basic">MIDI Basics</A>.</B> Overview of MIDI commands.
<LI>
<B><A HREF="midi/index.html#saol">MIDI Files and SAOL</A>.</B> Trigger times and channels.
<LI>
<B><A HREF="midi/index.html#instr">SAOL Instruments for MIDI</A>.</B> Specializations.
<LI>
<B><A HREF="midi/index.html#stnames">Standard Names</A>.</B> Access the MIDI data stream.
<LI>
<B><A HREF="midi/index.html#stream">Streaming and MIDI</A>.</B> Commands without trigger times.
</UL>
<H4>3. <A HREF="saolc/index.html">SAOL Instrument Control</A></H4>
<UL>
<LI>
<B><A HREF="saolc/index.html#instr">Dynamic Instruments.</A></B> The SAOL <B>instr</B> statement.
<LI>
<B><A HREF="saolc/index.html#stnames">Instrument Status</A>.</B> Standard names.
<LI>
<B><A HREF="saolc/index.html#extend">The Extend Statement</A>.</B>
Delaying instance termination.
<LI>
<B><A HREF="saolc/index.html#turnoff">The Turnoff Statement</A>.</B>
Forcing instance termination.
<LI>
<B><A HREF="saolc/index.html#order">Decoder Execution Order</A>.</B>
What happens when.
</UL>
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<A HREF="../../copyright/index.html">Copyright 1999 John Lazzaro and John
Wawrzynek.</A>
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