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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
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<TITLE>The MP4-SA Book: Appendix G: COR1 Changes to MP4-SA</TITLE>
<META name="description" content="An index to MP4-SA changes
introduced in the COR1 MPEG Audio Corrigenda (Feb 2001).">
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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>Appendix G: <A HREF="http://www.cs.berkeley.edu/~lazzaro/sa/book/append/fdis/SA_DCOR1.pdf">COR1</A>
Corrigenda Changes to MP4-SA</H1>
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<H2>User-Defined Opcodes</H2>
<P>
New <A HREF="../../opcodes/user/index.html#block">normative rate
semantics</A> describe the execution of i-rate statements in
<B>kopcodes</B> and k-rate and i-rate statements in <B>aopcodes</B>.
New <A HREF="../../opcodes/user/index.html#header">restrictions</A>
limit the use of k-rate and a-rate variables and statements in
user-defined polymorphic opcodes.
<H2>Opcode Call Rate Semantics</H2>
<P>
New normative rate semantics describe the execution of <B>kopcode</B>
calls in a-rate statements and <B>iopcode</B> calls in k-rate or
a-rate statements. Explained in both <A
HREF="../../saol/simple/index.html#rate3">core opcode</A> and <A
HREF="../../opcodes/user/index.html#rate3">user-defined opcode</A>
chapters.
<H2>If and If-Else Rate Semantics</H2>
<P>
New <A HREF="../../saol/exstat/index.html#if">normative rate
semantics</A> describe the execution of i-rate statements in k-rate
<B>if</B> and <B>if-else</B> statement blocks, and i-rate and k-rate
statements in a-rate <B>if</B> and <B>if-else</B> statement blocks.
<H2>Standard Names</H2>
<P>
SAOL programs may alter the value of writable standard names (<A
HREF="../../control/midi/index.html#stnames">MIDIctrl</A> and params)
by using the <A HREF="../../opcodes/user/index.html#calls">call by
reference</A> semantics of user-defined opcodes.
</TD>
<TD WIDTH="50%" VALIGN=top BGCOLOR="#FFCCCC">
<H2>Core Opcodes</H2>
<P>
The syntax and semantics of the <A
HREF="../../opcodes/sproc/index.html#comp">compressor</A> core opcode
has changed: all programs using this opcode will need to be altered.
Significant semantic changes have also been made to the <A
HREF="../../opcodes/sproc/index.html#fft">spectral</A> opcodes. Minor
clarifications have been made to several other core opcodes; consult
<A HREF="http://www.cs.berkeley.edu/~lazzaro/sa/book/append/fdis/SA_DCOR1.pdf"
>COR 1</A> for details.
<H2>Wavetable Generators</H2>
<P>
The semantics of the <A
HREF="../../saol/wave/index.html#lowgen">concat</A> and the <A
HREF="../../opcodes/sproc/index.html#window">window</A> wavetable
generator have been clarified.
<H2>MIDI</H2>
<P>
MP4-SA encodings that use the <B>midi_file</B> chunk now use the
default tempo of the MIDI File standard (120 beats/minute). New <A
HREF="../../control/midi/index.html#stnames">normative semantics</A>
for monitoring MIDI standard names in dynamic, effects, and SASL
instruments. Correct semantics for the All Sounds Off and All Notes
Off MIDI commands.
<H2>Miscellaneous</H2>
<P>
New <A HREF="../../opcodes/user/index.html#block">semantics</A> for
user-defined opcodes without return statements, and for empty return
statements. New semantics of event triggering in the <A
HREF="../../control/saolc/index.html#order">decoder execution</A>
cycle: an event occurs if its timestamp is less than or equal to the
current score time. Corrections to the SAOL <A
HREF="../../saol/exstat/index.html#logic">operator precedence</A>
table.
<pre>
</pre>
<B><P>
Appendix H:</B>
</B>
<A HREF="../notcov/index.html">Aspects of MP4-SA Not Covered in This Book</A>
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appendices</A>-><STRONG>cor 1 changes</STRONG>
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<A HREF="../../../copyright/index.html">Copyright 1999 John Lazzaro and John
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