1 files changed, 107 insertions, 0 deletions
diff --git a/Demo/scripts/toaiff.py b/Demo/scripts/toaiff.py
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+++ b/Demo/scripts/toaiff.py
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+"""Convert "arbitrary" sound files to AIFF (Apple and SGI's audio format).
+
+Input may be compressed.
+Uncompressed file type may be AIFF, WAV, VOC, 8SVX, NeXT/Sun, and others.
+An exception is raised if the file is not of a recognized type.
+Returned filename is either the input filename or a temporary filename;
+in the latter case the caller must ensure that it is removed.
+Other temporary files used are removed by the function.
+"""
+
+import os
+import tempfile
+import pipes
+import sndhdr
+
+__all__ = ["error", "toaiff"]
+
+table = {}
+
+t = pipes.Template()
+t.append('sox -t au - -t aiff -r 8000 -', '--')
+table['au'] = t
+
+# XXX The following is actually sub-optimal.
+# XXX The HCOM sampling rate can be 22k, 22k/2, 22k/3 or 22k/4.
+# XXX We must force the output sampling rate else the SGI won't play
+# XXX files sampled at 5.5k or 7.333k; however this means that files
+# XXX sampled at 11k are unnecessarily expanded.
+# XXX Similar comments apply to some other file types.
+t = pipes.Template()
+t.append('sox -t hcom - -t aiff -r 22050 -', '--')
+table['hcom'] = t
+
+t = pipes.Template()
+t.append('sox -t voc - -t aiff -r 11025 -', '--')
+table['voc'] = t
+
+t = pipes.Template()
+t.append('sox -t wav - -t aiff -', '--')
+table['wav'] = t
+
+t = pipes.Template()
+t.append('sox -t 8svx - -t aiff -r 16000 -', '--')
+table['8svx'] = t
+
+t = pipes.Template()
+t.append('sox -t sndt - -t aiff -r 16000 -', '--')
+table['sndt'] = t
+
+t = pipes.Template()
+t.append('sox -t sndr - -t aiff -r 16000 -', '--')
+table['sndr'] = t
+
+uncompress = pipes.Template()
+uncompress.append('uncompress', '--')
+
+
+class error(Exception):
+    pass
+
+def toaiff(filename):
+    temps = []
+    ret = None
+    try:
+        ret = _toaiff(filename, temps)
+    finally:
+        for temp in temps[:]:
+            if temp != ret:
+                try:
+                    os.unlink(temp)
+                except os.error:
+                    pass
+                temps.remove(temp)
+    return ret
+
+def _toaiff(filename, temps):
+    if filename[-2:] == '.Z':
+        (fd, fname) = tempfile.mkstemp()
+        os.close(fd)
+        temps.append(fname)
+        sts = uncompress.copy(filename, fname)
+        if sts:
+            raise error, filename + ': uncompress failed'
+    else:
+        fname = filename
+    try:
+        ftype = sndhdr.whathdr(fname)
+        if ftype:
+            ftype = ftype[0] # All we're interested in
+    except IOError as msg:
+        if type(msg) == type(()) and len(msg) == 2 and \
+                type(msg[0]) == type(0) and type(msg[1]) == type(''):
+            msg = msg[1]
+        if type(msg) != type(''):
+            msg = repr(msg)
+        raise error, filename + ': ' + msg
+    if ftype == 'aiff':
+        return fname
+    if ftype is None or not ftype in table:
+        raise error, '%s: unsupported audio file type %r' % (filename, ftype)
+    (fd, temp) = tempfile.mkstemp()
+    os.close(fd)
+    temps.append(temp)
+    sts = table[ftype].copy(fname, temp)
+    if sts:
+        raise error, filename + ': conversion to aiff failed'
+    return temp