1 files changed, 101 insertions, 0 deletions
diff --git a/Lib/toaiff.py b/Lib/toaiff.py
new file mode 100644
index 0000000..adb2e61
--- /dev/null
+++ b/Lib/toaiff.py
@@ -0,0 +1,101 @@
+# Convert "arbitrary" sound files to AIFF files (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
+
+table = {}
+
+t = pipes.Template().init()
+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().init()
+t.append('sox -t hcom - -t aiff -r 22050 -', '--')
+table['hcom'] = t
+
+t = pipes.Template().init()
+t.append('sox -t voc - -t aiff -r 11025 -', '--')
+table['voc'] = t
+
+t = pipes.Template().init()
+t.append('sox -t wav - -t aiff -', '--')
+table['wav'] = t
+
+t = pipes.Template().init()
+t.append('sox -t 8svx - -t aiff -r 16000 -', '--')
+table['8svx'] = t
+
+t = pipes.Template().init()
+t.append('sox -t sndt - -t aiff -r 16000 -', '--')
+table['sndt'] = t
+
+t = pipes.Template().init()
+t.append('sox -t sndr - -t aiff -r 16000 -', '--')
+table['sndr'] = t
+
+uncompress = pipes.Template().init()
+uncompress.append('uncompress', '--')
+
+
+error = 'toaiff.error' # Exception
+
+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':
+		fname = tempfile.mktemp()
+		temps.append(fname)
+		sts = uncompress.copy(filename, fname)
+		if sts:
+			raise error, filename + ': uncomress failed'
+	else:
+		fname = filename
+	try:
+		ftype = sndhdr.whathdr(fname)
+		if ftype:
+			ftype = ftype[0] # All we're interested in
+	except IOError:
+		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 = `msg`
+		raise error, filename + ': ' + msg
+	if ftype == 'aiff':
+		return fname
+	if ftype == None or not table.has_key(ftype):
+		raise error, \
+			filename + ': unsupported audio file type ' + `ftype`
+	temp = tempfile.mktemp()
+	temps.append(temp)
+	sts = table[ftype].copy(fname, temp)
+	if sts:
+		raise error, filename + ': conversion to aiff failed'
+	return temp