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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 | ||
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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>. | |
101 | </dl> | |
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