projects / OpenSPARC-T2-SAM / blame
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| 16 | <title>20.3.2 Parser Objects</title> | |
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| 53 | ||
| 54 | <H2><A NAME="SECTION0022320000000000000000"></A> | |
| 55 | <A NAME="cd-parser-objects"></A> | |
| 56 | <BR> | |
| 57 | 20.3.2 Parser Objects | |
| 58 | </H2> | |
| 59 | ||
| 60 | <P> | |
| 61 | Parser objects (returned by <tt class="function">createparser()</tt>) have the | |
| 62 | following methods: | |
| 63 | ||
| 64 | <P> | |
| 65 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 66 | <td><nobr><b><tt id='l2h-5106' xml:id='l2h-5106' class="method">addcallback</tt></b>(</nobr></td> | |
| 67 | <td><var>type, func, arg</var>)</td></tr></table></dt> | |
| 68 | <dd> | |
| 69 | Adds a callback for the parser. The parser has callbacks for eight | |
| 70 | different types of data in the digital audio data stream. Constants | |
| 71 | for these types are defined at the <tt class="module">cd</tt> module level (see above). | |
| 72 | The callback is called as follows: <code><var>func</var>(<var>arg</var>, type, | |
| 73 | data)</code>, where <var>arg</var> is the user supplied argument, <var>type</var> is | |
| 74 | the particular type of callback, and <var>data</var> is the data returned | |
| 75 | for this <var>type</var> of callback. The type of the data depends on the | |
| 76 | <var>type</var> of callback as follows: | |
| 77 | ||
| 78 | <P> | |
| 79 | <div class="center"><table class="realtable"> | |
| 80 | <thead> | |
| 81 | <tr> | |
| 82 | <th class="left" >Type</th> | |
| 83 | <th class="left" >Value</th> | |
| 84 | </tr> | |
| 85 | </thead> | |
| 86 | <tbody> | |
| 87 | <tr><td class="left" valign="baseline"><code>audio</code></td> | |
| 88 | <td class="left" >String which can be passed unmodified to | |
| 89 | <tt class="function">al.writesamps()</tt>.</td></tr> | |
| 90 | <tr><td class="left" valign="baseline"><code>pnum</code></td> | |
| 91 | <td class="left" >Integer giving the program (track) number.</td></tr> | |
| 92 | <tr><td class="left" valign="baseline"><code>index</code></td> | |
| 93 | <td class="left" >Integer giving the index number.</td></tr> | |
| 94 | <tr><td class="left" valign="baseline"><code>ptime</code></td> | |
| 95 | <td class="left" >Tuple consisting of the program time in minutes, | |
| 96 | seconds, and frames.</td></tr> | |
| 97 | <tr><td class="left" valign="baseline"><code>atime</code></td> | |
| 98 | <td class="left" >Tuple consisting of the absolute time in minutes, | |
| 99 | seconds, and frames.</td></tr> | |
| 100 | <tr><td class="left" valign="baseline"><code>catalog</code></td> | |
| 101 | <td class="left" >String of 13 characters, giving the catalog number | |
| 102 | of the CD.</td></tr> | |
| 103 | <tr><td class="left" valign="baseline"><code>ident</code></td> | |
| 104 | <td class="left" >String of 12 characters, giving the ISRC | |
| 105 | identification number of the recording. The string consists of two | |
| 106 | characters country code, three characters owner code, two characters | |
| 107 | giving the year, and five characters giving a serial number.</td></tr> | |
| 108 | <tr><td class="left" valign="baseline"><code>control</code></td> | |
| 109 | <td class="left" >Integer giving the control bits from the CD | |
| 110 | subcode data</td></tr></tbody> | |
| 111 | </table></div> | |
| 112 | </dl> | |
| 113 | ||
| 114 | <P> | |
| 115 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 116 | <td><nobr><b><tt id='l2h-5107' xml:id='l2h-5107' class="method">deleteparser</tt></b>(</nobr></td> | |
| 117 | <td><var></var>)</td></tr></table></dt> | |
| 118 | <dd> | |
| 119 | Deletes the parser and frees the memory it was using. The object | |
| 120 | should not be used after this call. This call is done automatically | |
| 121 | when the last reference to the object is removed. | |
| 122 | </dl> | |
| 123 | ||
| 124 | <P> | |
| 125 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 126 | <td><nobr><b><tt id='l2h-5108' xml:id='l2h-5108' class="method">parseframe</tt></b>(</nobr></td> | |
| 127 | <td><var>frame</var>)</td></tr></table></dt> | |
| 128 | <dd> | |
| 129 | Parses one or more frames of digital audio data from a CD such as | |
| 130 | returned by <tt class="method">readda()</tt>. It determines which subcodes are | |
| 131 | present in the data. If these subcodes have changed since the last | |
| 132 | frame, then <tt class="method">parseframe()</tt> executes a callback of the | |
| 133 | appropriate type passing to it the subcode data found in the frame. | |
| 134 | Unlike the C function, more than one frame of digital audio data | |
| 135 | can be passed to this method. | |
| 136 | </dl> | |
| 137 | ||
| 138 | <P> | |
| 139 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 140 | <td><nobr><b><tt id='l2h-5109' xml:id='l2h-5109' class="method">removecallback</tt></b>(</nobr></td> | |
| 141 | <td><var>type</var>)</td></tr></table></dt> | |
| 142 | <dd> | |
| 143 | Removes the callback for the given <var>type</var>. | |
| 144 | </dl> | |
| 145 | ||
| 146 | <P> | |
| 147 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 148 | <td><nobr><b><tt id='l2h-5110' xml:id='l2h-5110' class="method">resetparser</tt></b>(</nobr></td> | |
| 149 | <td><var></var>)</td></tr></table></dt> | |
| 150 | <dd> | |
| 151 | Resets the fields of the parser used for tracking subcodes to an | |
| 152 | initial state. <tt class="method">resetparser()</tt> should be called after the disc | |
| 153 | has been changed. | |
| 154 | </dl> | |
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| 190 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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