1 files changed, 54 insertions, 0 deletions
diff --git a/lib/sunaudio.py b/lib/sunaudio.py
new file mode 100644
index 0000000..ed1b6e4
--- /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`