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| 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 | |
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| 221 | <A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></a> |
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| 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> |
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| 264 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> |
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