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
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
"http://www.w3.org/TR/REC-html40/loose.dtd">
<HTML>
<HEAD>
<TITLE>The MP4-SA Book: Appendix L: MP4-SA Items for COR2 (March 2002)</TITLE>
<META name="description" content="Listing of items from the March 2002
MPEG 4 Corrigenda that relate to Structured Audio.">
<META name="keywords" content="MP4-SA">
</HEAD>
<BODY BGCOLOR="#FFFFFF" TEXT="#000000" LINK="0000EE" ALINK="FF6666"
VLINK="551A8B">
<A NAME="begin"> </A>
<TABLE BGCOLOR="#CCCCFF" WIDTH="100%" CLASS=navbar>
<TR>
<TD>
<FONT FACE="Verdana, Lucida Sans, Arial, Helvetica, Geneva,
sans-serif"><SMALL>
<A HREF="../../../../index.html">mp4-sa</A>-><A HREF="../../../index.html">
the mp4-sa book</A>-><A HREF="../../index.html">
appendices</A>-><STRONG>cor2 items</STRONG>
</SMALL></FONT>
</TD></TR>
</TABLE>
<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 L: MP4-SA Items for COR2 (March 2002)</H1>
<TABLE WIDTH="100%" CELLPADDING=12 CELLSPACING=0>
<TR>
<TD WIDTH="50%" VALIGN=top BGCOLOR="#CCFFCC">
<H2>Item 1</H2>
<P>
In subclause 5.7.3.3.5.2 (Determination of instrument output width
and bus width), replace the second sentence of the first paragraph
with:
<P>
<I>the width of each bus is either provided by a <B>send</B> statement
(subclause 5.8.5.5) or is determined by the sum of the output widths
(subclause 5.8.6.6.8) of the instruments routed to that bus in a
single <B>route</B> statement (subclause 5.8.5.4).</I>
<H2>Item 2</H2>
<P>
In subclause 5.7.3.3.5.2 (Determination of instrument output width
and bus width), remove the beginning of the third sentence:
<P>
<I>Only for the purpose of calculating bus widths</I>
<H2>Item 3</H2>
<P>
In subclause 5.7.3.3.5.2 (Determination of instrument output width
and bus width), add the following note at the end of the first
paragraph, before EXAMPLE 1:
<P>
<I>NOTE: if the output width of an instrument depends on
<B>outchannels</B>, and the bus width of the bus where that instrument
is routed is not specified by means of other <B>send</B> and
<B>route</B> statements, the orchestra may be indeterministic.
Programmers should pay special attention in checking the
deterministic behavior of the orchestra or make use of determined
bus widths (subclause 5.8.5.5).</I>
<H2>Item 4</H2>
<P>
In subclause 5.7.3.3.5.2 (Determination of instrument output width
and bus width), in EXAMPLE 1 replace the second route with:
<P>
<I>route(bus2, i2, i1);</I>
<H2>Item 5</H2>
<P>
In subclause 5.7.3.3.5.2 (Determination of instrument output width
and bus width) remove instr i3 from the pseudo-code. Replace the
paragraph following the pseudo-code with:
<P>
<I>In this orchestra, the global sequencing rules (subclause 5.8.5.6)
specify that instrument <B>i1</B> precedes instrument <B>i2</B>, and
instrument <B>i1</B> and <B>i2</B> precede instrument
<B>i4</B>. Instrument <B>i1</B> has two channels, so bus <B>bus1</B>
has two channels. Instrument <B>i2</B> has two channels, since it gets
input from <B>bus1</B>. The bus <B>bus2</B> has four channels, two
each from <B>i2</B> and <B>i1</B>. The instrument <B>i4</B> has four
channels, since it gets input from <B>bus2</B>.</I>
<H2>Item 6</H2>
<P>
In subclause 5.8.5.3.2 (Signal variables), replace the second part
of the paragraph following <array length> specification with:
<P>
<I>
If the latter, the array length shall be the same as the number of
input channels or output channels of the orchestra, respectively. It
is illegal to use the token <B>inchannels</B> if the number of input
channels to the orchestra is 0.</I>
<H2>Item 7</H2>
<P>
In subclause 5.8.5.5 (Send statement), change the definition
of <I><send statement></I> to be:
<P>
<I>send(<ident>;<exprlist>;<namelist>)</I>
<H2>Item 8</H2>
<P>
In subclause 5.8.5.5 (Send statement), in the paragraph beginning with
"Any bus may be routed to more than one effect instrument" replace the
first sentence with:
<P>
<I>
Any bus, except for the special bus <B>output_bus</B>, may be sent to
more than one effect instrument and/or instantiations; in this case,
when the simple identifier is not used, it is illegal to refer to a
bus with more than one length.</I>
<H2>Item 9</H2>
<P>
In subclause 5.8.6.5.1 (Syntactic form), replace the line following
the <tablemap declaration> with:
<P>
<I>
<array length> and <namelist> as defined in subclause
5.8.5.3.2, except that in the instrument scope the tokens
<B>inchannels</B> and <B>outchannels</B> refer to the input channels
and output channels of the instrument, respectively.</I>
<H2>Item 10</H2>
<P>
In subclause 5.8.6.8.5 (outchan), replace standard name description
with:
<P>
<I>
The standard name <B>outchan</B>, in each scope, shall contain the number
of channels ofoutput provided by the instrument instantiation with
which that scope is associated, in the sense described in subclause
5.8.6.8.4.</I>
<H2>Item 11</H2>
<P>
In subclause 5.8.7.4.1 (Syntactic form), replace the last sentence of
the first paragraph to:
<P>
<I>
If the array width is the special token <B>outchannels</B>, then the
array width shall be the same as the number of output channels to the
associated instrument instantiation (in the sense described in
subclause 5.8.6.8.4).</I>
</TD>
<TD WIDTH="50%" VALIGN=top BGCOLOR="#FFCCCC">
<H2>Item 12</H2>
<P>
In subclause 5.8.7.5.1, (Syntactic form) after the <opcode var
declaration> lines, replace the first two lines as follows:
<P>
<I>
<namelist> and <instr variable declaration> as defined in
subclause 5.8.5.3.2 and subclause 5.8.6.5.1. In the opcode scope, the
tokens <B>inchannels</B> and <B>outchannels</B> refer to the input channels and
output channels of the associated instrument,respectively (in the
sense described in subclause 5.8.6.8.4).</I>
<H2>Item 13</H2>
<P>
In subclause 5.8.6.6.2 (Assignment), add at the end of the third
paragraph (If the lvalue denotes an entire array...):
<P>
<I>
In the case that lvalue depends on the ordering of computation of the
right-hand-side expression (e.g. if an entire array is multiplied with
one of its elements), lvalue is undefined.</I>
<H2>Item 14</H2>
<P>In subclause 5.8.6.6.11 (Extend), in the third paragraph replace
the following text:
<P><I>or the rate of the guarding expression containing the statement,
or the rate of the opcode containing the statement, whichever is
fastest.</I>
<P>
with the text
<P><I>or the control rate if the rate of the guarding expression containing
the statement, or the rate of the opcode containing the statement, is faster
than the rate of the expression parameter.</I>
<P>
(MP4-SA Book Author Note: The purpose of this text is to make a-rate
<B>extend</B> statements illegal.)
<H2>Item 15</H2>
<P>
In subclause 5.8.6.6.11 (Extend), before the NOTE add:
<P>
<I>
The <B>extend</B> statement shall not be executed in an instrument instance
that is created asthe result of a <B>send</B> statement referencing the
special bus <B>output_bus</B>.</I>
<H2>Item 16</H2>
<P>
In subclause 5.8.7.5.1 (Syntactic form), at the end of the second
paragraph add the following paragraph:
<P><I>A variable shall not have a rate faster than the rate of the
opcode. Standard names faster than the rate of the opcode are not
defined in the opcode. The imports tag shall not be used for local
k-rate signals when there is no global variable of the same name.
</I>
<H2>Item 17</H2>
<P> In subclause 5.8.7.7.3 (Shared variables and statements slower
than the rate of the opcode),at the end of the third paragraph add:
<P><I>
Statements that contain expressions of type <B>specialop</B> (subclause
5.9.2) are executed both at the k-rate and a-rate, and those
expressions return values as specified in subclause 5.8.6.7.6 and
5.9.2.
</I>
<H2>Item 18</H2>
<P>In subclause 5.9.2 (Specialop type), add at the end of the third
paragraph:
<P>
<I>Calls to <B>specialop</B> type opcodes are not allowed in
<B>iopcodes</B>, <B>kopcodes</B> and <B>opcodes</B>. If a call to a
<B>specialop</B> type opcode is present in an <B>aopcode</B>, the
specialop opcode is executed both at k-rate and a-rate according to
rules specified in subclause 5.8.7.7.3.</I>
<H2>Item 19</H2>
<P>In subclause 5.9.11.1 (rms), replace the sentence:
<P><I>It is a run-time error if length is provided and is negative.</I>
<P>
with
<P><I>It is a run-time error if length is provided and is not strictly
positive.</I>
<H2>Item 20</H2>
<P>
In subclause 5.9.12.3 (downsamp), in the fourth paragraph replace:
<P><I>0<i<SR*KR</I>
<P>
with
<P><I>0<i<SR/KR</I>
<H2>Item 21</H2>
<P>In subclause 5.C.3 (Syntactic grammar for SAOL in yacc), in senddef
replace
<P><I>identlist</I>
<P>
with
<P><I>namelist</I>
<pre>
</pre>
<B><P>
Return to:</B>
</B>
<A HREF="../../index.html">Appendix Cover Page</A>
</TD>
</TR>
</TABLE>
<BODY BGCOLOR="#FFFFFF">
<TABLE BGCOLOR="#CCCCFF" WIDTH="100%" CLASS=navbar>
<TR>
<TD>
<FONT FACE="Verdana, Lucida Sans, Arial, Helvetica, Geneva,
sans-serif"><SMALL>
<A HREF="../../../../index.html">mp4-sa</A>-><A HREF="../../../index.html">
the mp4-sa book</A>-><A HREF="../../index.html">
appendices</A>-><STRONG>cor2 items</STRONG>
</SMALL></FONT>
</TD></TR>
</TABLE>
</BODY>
</HTML>
|
