Initial revision

1 files changed, 54 insertions, 0 deletions

diff --git a/Lib/sunaudio.py b/Lib/sunaudio.py
new file mode 100644
index 0000000..92a6203
--- /dev/null
+++ b/Lib/sunaudio.py
@@ -0,0 +1,54 @@
+# Module 'sunaudio' -- interpret sun audio headers
+
+import audio
+
+MAGIC = '.snd'
+
+error = 'sunaudio sound header conversion error'
+
+
+# convert a 4-char value to integer
+
+def c2i(data):
+	if type(data) <> type('') or len(data) <> 4:
+		raise error, 'c2i: bad arg (not string[4])'
+	bytes = audio.chr2num(data)
+	for i in (1, 2, 3):
+		if bytes[i] < 0:
+			bytes[i] = bytes[i] + 256
+	return ((bytes[0]*256 + bytes[1])*256 + bytes[2])*256 + bytes[3]
+
+
+# read a sound header from an open file
+
+def gethdr(fp):
+	if fp.read(4) <> MAGIC:
+		raise error, 'gethdr: bad magic word'
+	hdr_size = c2i(fp.read(4))
+	data_size = c2i(fp.read(4))
+	encoding = c2i(fp.read(4))
+	sample_rate = c2i(fp.read(4))
+	channels = c2i(fp.read(4))
+	excess = hdr_size - 24
+	if excess < 0:
+		raise error, 'gethdr: bad hdr_size'
+	if excess > 0:
+		info = fp.read(excess)
+	else:
+		info = ''
+	return (data_size, encoding, sample_rate, channels, info)
+
+
+# read and print the sound header of a named file
+
+def printhdr(file):
+	hdr = gethdr(open(file, 'r'))
+	data_size, encoding, sample_rate, channels, info = hdr
+	while info[-1:] = '\0':
+		info = info[:-1]
+	print 'File name:  ', file
+	print 'Data size:  ', data_size
+	print 'Encoding:   ', encoding
+	print 'Sample rate:', sample_rate
+	print 'Channels:   ', channels
+	print 'Info:       ', `info`