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<H1><A NAME="SECTION0022300000000000000000">
20.3 <tt class="module">cd</tt> --
         CD-ROM access on SGI systems</A>
</H1>

<P>
<A NAME="module-cd"></A>  
<p class="availability">Availability: <span
 class="platform">IRIX</span>.</p>

<P>
This module provides an interface to the Silicon Graphics CD library.
It is available only on Silicon Graphics systems.

<P>
The way the library works is as follows.  A program opens the CD-ROM
device with <tt class="function">open()</tt> and creates a parser to parse the data
from the CD with <tt class="function">createparser()</tt>.  The object returned by
<tt class="function">open()</tt> can be used to read data from the CD, but also to get
status information for the CD-ROM device, and to get information about
the CD, such as the table of contents.  Data from the CD is passed to
the parser, which parses the frames, and calls any callback
functions that have previously been added.

<P>
An audio CD is divided into <i class="dfn">tracks</i> or <i class="dfn">programs</i> (the terms
are used interchangeably).  Tracks can be subdivided into
<i class="dfn">indices</i>.  An audio CD contains a <i class="dfn">table of contents</i> which
gives the starts of the tracks on the CD.  Index 0 is usually the
pause before the start of a track.  The start of the track as given by
the table of contents is normally the start of index 1.

<P>
Positions on a CD can be represented in two ways.  Either a frame
number or a tuple of three values, minutes, seconds and frames.  Most
functions use the latter representation.  Positions can be both
relative to the beginning of the CD, and to the beginning of the
track.

<P>
Module <tt class="module">cd</tt> defines the following functions and constants:

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-5067' xml:id='l2h-5067' class="function">createparser</tt></b>(</nobr></td>
  <td><var></var>)</td></tr></table></dt>
<dd>
Create and return an opaque parser object.  The methods of the parser
object are described below.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-5068' xml:id='l2h-5068' class="function">msftoframe</tt></b>(</nobr></td>
  <td><var>minutes, seconds, frames</var>)</td></tr></table></dt>
<dd>
Converts a <code>(<var>minutes</var>, <var>seconds</var>, <var>frames</var>)</code> triple
representing time in absolute time code into the corresponding CD
frame number.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-5069' xml:id='l2h-5069' class="function">open</tt></b>(</nobr></td>
  <td><var></var><big>[</big><var>device</var><big>[</big><var>, mode</var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt>
<dd>
Open the CD-ROM device.  The return value is an opaque player object;
methods of the player object are described below.  The device is the
name of the SCSI device file, e.g. <code>'/dev/scsi/sc0d4l0'</code>, or
<code>None</code>.  If omitted or <code>None</code>, the hardware inventory is
consulted to locate a CD-ROM drive.  The <var>mode</var>, if not omitted,
should be the string <code>'r'</code>.
</dl>

<P>
The module defines the following variables:

<P>
<dl><dt><b><span class="typelabel">exception</span>&nbsp;<tt id='l2h-5070' xml:id='l2h-5070' class="exception">error</tt></b></dt>
<dd>
Exception raised on various errors.
</dd></dl>

<P>
<dl><dt><b><tt id='l2h-5071' xml:id='l2h-5071'>DATASIZE</tt></b></dt>
<dd>
The size of one frame's worth of audio data.  This is the size of the
audio data as passed to the callback of type <code>audio</code>.
</dd></dl>

<P>
<dl><dt><b><tt id='l2h-5072' xml:id='l2h-5072'>BLOCKSIZE</tt></b></dt>
<dd>
The size of one uninterpreted frame of audio data.
</dd></dl>

<P>
The following variables are states as returned by
<tt class="function">getstatus()</tt>:

<P>
<dl><dt><b><tt id='l2h-5073' xml:id='l2h-5073'>READY</tt></b></dt>
<dd>
The drive is ready for operation loaded with an audio CD.
</dd></dl>

<P>
<dl><dt><b><tt id='l2h-5074' xml:id='l2h-5074'>NODISC</tt></b></dt>
<dd>
The drive does not have a CD loaded.
</dd></dl>

<P>
<dl><dt><b><tt id='l2h-5075' xml:id='l2h-5075'>CDROM</tt></b></dt>
<dd>
The drive is loaded with a CD-ROM.  Subsequent play or read operations
will return I/O errors.
</dd></dl>

<P>
<dl><dt><b><tt id='l2h-5076' xml:id='l2h-5076'>ERROR</tt></b></dt>
<dd>
An error occurred while trying to read the disc or its table of
contents.
</dd></dl>

<P>
<dl><dt><b><tt id='l2h-5077' xml:id='l2h-5077'>PLAYING</tt></b></dt>
<dd>
The drive is in CD player mode playing an audio CD through its audio
jacks.
</dd></dl>

<P>
<dl><dt><b><tt id='l2h-5078' xml:id='l2h-5078'>PAUSED</tt></b></dt>
<dd>
The drive is in CD layer mode with play paused.
</dd></dl>

<P>
<dl><dt><b><tt id='l2h-5079' xml:id='l2h-5079'>STILL</tt></b></dt>
<dd>
The equivalent of <tt class="constant">PAUSED</tt> on older (non 3301) model Toshiba
CD-ROM drives.  Such drives have never been shipped by SGI.
</dd></dl>

<P>
<dl><dt><b><tt id='l2h-5080' xml:id='l2h-5080'>audio</tt></b></dt>
<dd>
<dt><b><tt id='l2h-5081' xml:id='l2h-5081'>pnum</tt></b></dt><dd>
<dt><b><tt id='l2h-5082' xml:id='l2h-5082'>index</tt></b></dt><dd>
<dt><b><tt id='l2h-5083' xml:id='l2h-5083'>ptime</tt></b></dt><dd>
<dt><b><tt id='l2h-5084' xml:id='l2h-5084'>atime</tt></b></dt><dd>
<dt><b><tt id='l2h-5085' xml:id='l2h-5085'>catalog</tt></b></dt><dd>
<dt><b><tt id='l2h-5086' xml:id='l2h-5086'>ident</tt></b></dt><dd>
<dt><b><tt id='l2h-5087' xml:id='l2h-5087'>control</tt></b></dt><dd>
Integer constants describing the various types of parser callbacks
that can be set by the <tt class="method">addcallback()</tt> method of CD parser
objects (see below).
</dd></dl>

<P>

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<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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	54
	55	<H1><A NAME="SECTION0022300000000000000000">
	56	20.3 <tt class="module">cd</tt> --
	57	CD-ROM access on SGI systems</A>
	58	</H1>
	59
	60	<P>
	61	<A NAME="module-cd"></A>
	62	<p class="availability">Availability: <span
	63	class="platform">IRIX</span>.</p>
	64
65	<P>
66	This module provides an interface to the Silicon Graphics CD library.
67	It is available only on Silicon Graphics systems.
68
69	<P>
70	The way the library works is as follows. A program opens the CD-ROM
71	device with <tt class="function">open()</tt> and creates a parser to parse the data
72	from the CD with <tt class="function">createparser()</tt>. The object returned by
73	<tt class="function">open()</tt> can be used to read data from the CD, but also to get
74	status information for the CD-ROM device, and to get information about
75	the CD, such as the table of contents. Data from the CD is passed to
76	the parser, which parses the frames, and calls any callback
77	functions that have previously been added.
78
79	<P>
80	An audio CD is divided into <i class="dfn">tracks</i> or <i class="dfn">programs</i> (the terms
81	are used interchangeably). Tracks can be subdivided into
82	<i class="dfn">indices</i>. An audio CD contains a <i class="dfn">table of contents</i> which
83	gives the starts of the tracks on the CD. Index 0 is usually the
84	pause before the start of a track. The start of the track as given by
85	the table of contents is normally the start of index 1.
86
87	<P>
88	Positions on a CD can be represented in two ways. Either a frame
89	number or a tuple of three values, minutes, seconds and frames. Most
90	functions use the latter representation. Positions can be both
91	relative to the beginning of the CD, and to the beginning of the
92	track.
93
94	<P>
95	Module <tt class="module">cd</tt> defines the following functions and constants:
96
97	<P>
98	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
99	<td><nobr><b><tt id='l2h-5067' xml:id='l2h-5067' class="function">createparser</tt></b>(</nobr></td>
100	<td><var></var>)</td></tr></table></dt>
101	<dd>
102	Create and return an opaque parser object. The methods of the parser
103	object are described below.
104	</dl>
105
106	<P>
107	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
108	<td><nobr><b><tt id='l2h-5068' xml:id='l2h-5068' class="function">msftoframe</tt></b>(</nobr></td>
109	<td><var>minutes, seconds, frames</var>)</td></tr></table></dt>
110	<dd>
111	Converts a <code>(<var>minutes</var>, <var>seconds</var>, <var>frames</var>)</code> triple
112	representing time in absolute time code into the corresponding CD
113	frame number.
114	</dl>
115
116	<P>
117	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
118	<td><nobr><b><tt id='l2h-5069' xml:id='l2h-5069' class="function">open</tt></b>(</nobr></td>
119	<td><var></var><big>[</big><var>device</var><big>[</big><var>, mode</var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt>
120	<dd>
121	Open the CD-ROM device. The return value is an opaque player object;
122	methods of the player object are described below. The device is the
123	name of the SCSI device file, e.g. <code>'/dev/scsi/sc0d4l0'</code>, or
124	<code>None</code>. If omitted or <code>None</code>, the hardware inventory is
125	consulted to locate a CD-ROM drive. The <var>mode</var>, if not omitted,
126	should be the string <code>'r'</code>.
127	</dl>
128
129	<P>
130	The module defines the following variables:
131
132	<P>
133	<dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-5070' xml:id='l2h-5070' class="exception">error</tt></b></dt>
134	<dd>
135	Exception raised on various errors.
136	</dd></dl>
137
138	<P>
139	<dl><dt><b><tt id='l2h-5071' xml:id='l2h-5071'>DATASIZE</tt></b></dt>
140	<dd>
141	The size of one frame's worth of audio data. This is the size of the
142	audio data as passed to the callback of type <code>audio</code>.
143	</dd></dl>
144
145	<P>
146	<dl><dt><b><tt id='l2h-5072' xml:id='l2h-5072'>BLOCKSIZE</tt></b></dt>
147	<dd>
148	The size of one uninterpreted frame of audio data.
149	</dd></dl>
150
151	<P>
152	The following variables are states as returned by
153	<tt class="function">getstatus()</tt>:
154
155	<P>
156	<dl><dt><b><tt id='l2h-5073' xml:id='l2h-5073'>READY</tt></b></dt>
157	<dd>
158	The drive is ready for operation loaded with an audio CD.
159	</dd></dl>
160
161	<P>
162	<dl><dt><b><tt id='l2h-5074' xml:id='l2h-5074'>NODISC</tt></b></dt>
163	<dd>
164	The drive does not have a CD loaded.
165	</dd></dl>
166
167	<P>
168	<dl><dt><b><tt id='l2h-5075' xml:id='l2h-5075'>CDROM</tt></b></dt>
169	<dd>
170	The drive is loaded with a CD-ROM. Subsequent play or read operations
171	will return I/O errors.
172	</dd></dl>
173
174	<P>
175	<dl><dt><b><tt id='l2h-5076' xml:id='l2h-5076'>ERROR</tt></b></dt>
176	<dd>
177	An error occurred while trying to read the disc or its table of
178	contents.
179	</dd></dl>
180
181	<P>
182	<dl><dt><b><tt id='l2h-5077' xml:id='l2h-5077'>PLAYING</tt></b></dt>
183	<dd>
184	The drive is in CD player mode playing an audio CD through its audio
185	jacks.
186	</dd></dl>
187
188	<P>
189	<dl><dt><b><tt id='l2h-5078' xml:id='l2h-5078'>PAUSED</tt></b></dt>
190	<dd>
191	The drive is in CD layer mode with play paused.
192	</dd></dl>
193
194	<P>
195	<dl><dt><b><tt id='l2h-5079' xml:id='l2h-5079'>STILL</tt></b></dt>
196	<dd>
197	The equivalent of <tt class="constant">PAUSED</tt> on older (non 3301) model Toshiba
198	CD-ROM drives. Such drives have never been shipped by SGI.
199	</dd></dl>
200
201	<P>
202	<dl><dt><b><tt id='l2h-5080' xml:id='l2h-5080'>audio</tt></b></dt>
203	<dd>
204	<dt><b><tt id='l2h-5081' xml:id='l2h-5081'>pnum</tt></b></dt><dd>
205	<dt><b><tt id='l2h-5082' xml:id='l2h-5082'>index</tt></b></dt><dd>
206	<dt><b><tt id='l2h-5083' xml:id='l2h-5083'>ptime</tt></b></dt><dd>
207	<dt><b><tt id='l2h-5084' xml:id='l2h-5084'>atime</tt></b></dt><dd>
208	<dt><b><tt id='l2h-5085' xml:id='l2h-5085'>catalog</tt></b></dt><dd>
209	<dt><b><tt id='l2h-5086' xml:id='l2h-5086'>ident</tt></b></dt><dd>
210	<dt><b><tt id='l2h-5087' xml:id='l2h-5087'>control</tt></b></dt><dd>
211	Integer constants describing the various types of parser callbacks
212	that can be set by the <tt class="method">addcallback()</tt> method of CD parser
213	objects (see below).
214	</dd></dl>
215
216	<P>
217
218	<p><br /></p><hr class='online-navigation' />
219	<div class='online-navigation'>
220	<!--Table of Child-Links-->
221	<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></a>
222
223	<UL CLASS="ChildLinks">
224	<LI><A href="player-objects.html">20.3.1 Player Objects</a>
225	<LI><A href="cd-parser-objects.html">20.3.2 Parser Objects</a>
226	</ul>
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