projects / OpenSPARC-T2-SAM / blame
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| 55 | <H1><A NAME="SECTION00161000000000000000000"> | |
| 56 | 14.10 <tt class="module">sndhdr</tt> -- | |
| 57 | Determine type of sound file</A> | |
| 58 | </H1> | |
| 59 | ||
| 60 | <P> | |
| 61 | <A NAME="module-sndhdr"></A> | |
| 62 | ||
| 63 | <P> | |
| 64 | The <tt class="module">sndhdr</tt> provides utility functions which attempt to | |
| 65 | determine the type of sound data which is in a file. When these | |
| 66 | functions are able to determine what type of sound data is stored in a | |
| 67 | file, they return a tuple <code>(<var>type</var>, <var>sampling_rate</var>, | |
| 68 | <var>channels</var>, <var>frames</var>, <var>bits_per_sample</var>)</code>. The value for | |
| 69 | <var>type</var> indicates the data type and will be one of the strings | |
| 70 | <code>'aifc'</code>, <code>'aiff'</code>, <code>'au'</code>, <code>'hcom'</code>, | |
| 71 | <code>'sndr'</code>, <code>'sndt'</code>, <code>'voc'</code>, <code>'wav'</code>, | |
| 72 | <code>'8svx'</code>, <code>'sb'</code>, <code>'ub'</code>, or <code>'ul'</code>. The | |
| 73 | <var>sampling_rate</var> will be either the actual value or <code>0</code> if | |
| 74 | unknown or difficult to decode. Similarly, <var>channels</var> will be | |
| 75 | either the number of channels or <code>0</code> if it cannot be determined | |
| 76 | or if the value is difficult to decode. The value for <var>frames</var> | |
| 77 | will be either the number of frames or <code>-1</code>. The last item in | |
| 78 | the tuple, <var>bits_per_sample</var>, will either be the sample size in | |
| 79 | bits or <code>'A'</code> for A-LAW<a id='l2h-4767' xml:id='l2h-4767'></a> or <code>'U'</code> for | |
| 80 | u-LAW<a id='l2h-4768' xml:id='l2h-4768'></a>. | |
| 81 | ||
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| 83 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 84 | <td><nobr><b><tt id='l2h-4765' xml:id='l2h-4765' class="function">what</tt></b>(</nobr></td> | |
| 85 | <td><var>filename</var>)</td></tr></table></dt> | |
| 86 | <dd> | |
| 87 | Determines the type of sound data stored in the file <var>filename</var> | |
| 88 | using <tt class="function">whathdr()</tt>. If it succeeds, returns a tuple as | |
| 89 | described above, otherwise <code>None</code> is returned. | |
| 90 | </dl> | |
| 91 | ||
| 92 | <P> | |
| 93 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 94 | <td><nobr><b><tt id='l2h-4766' xml:id='l2h-4766' class="function">whathdr</tt></b>(</nobr></td> | |
| 95 | <td><var>filename</var>)</td></tr></table></dt> | |
| 96 | <dd> | |
| 97 | Determines the type of sound data stored in a file based on the file | |
| 98 | header. The name of the file is given by <var>filename</var>. This | |
| 99 | function returns a tuple as described above on success, or | |
| 100 | <code>None</code>. | |
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