mirror of
https://github.com/python/cpython.git
synced 2024-12-01 03:01:36 +01:00
55 lines
1.3 KiB
Python
55 lines
1.3 KiB
Python
# 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`
|