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Diffstat (limited to 'lib/python2.7/sndhdr.py')
| -rw-r--r-- | lib/python2.7/sndhdr.py | 228 |
1 files changed, 0 insertions, 228 deletions
diff --git a/lib/python2.7/sndhdr.py b/lib/python2.7/sndhdr.py deleted file mode 100644 index cc2d6b8..0000000 --- a/lib/python2.7/sndhdr.py +++ /dev/null @@ -1,228 +0,0 @@ -"""Routines to help recognizing sound files. - -Function whathdr() recognizes various types of sound file headers. -It understands almost all headers that SOX can decode. - -The return tuple contains the following items, in this order: -- file type (as SOX understands it) -- sampling rate (0 if unknown or hard to decode) -- number of channels (0 if unknown or hard to decode) -- number of frames in the file (-1 if unknown or hard to decode) -- number of bits/sample, or 'U' for U-LAW, or 'A' for A-LAW - -If the file doesn't have a recognizable type, it returns None. -If the file can't be opened, IOError is raised. - -To compute the total time, divide the number of frames by the -sampling rate (a frame contains a sample for each channel). - -Function what() calls whathdr(). (It used to also use some -heuristics for raw data, but this doesn't work very well.) - -Finally, the function test() is a simple main program that calls -what() for all files mentioned on the argument list. For directory -arguments it calls what() for all files in that directory. Default -argument is "." (testing all files in the current directory). The -option -r tells it to recurse down directories found inside -explicitly given directories. -""" - -# The file structure is top-down except that the test program and its -# subroutine come last. - -__all__ = ["what","whathdr"] - -def what(filename): - """Guess the type of a sound file""" - res = whathdr(filename) - return res - - -def whathdr(filename): - """Recognize sound headers""" - f = open(filename, 'rb') - h = f.read(512) - for tf in tests: - res = tf(h, f) - if res: - return res - return None - - -#-----------------------------------# -# Subroutines per sound header type # -#-----------------------------------# - -tests = [] - -def test_aifc(h, f): - import aifc - if h[:4] != 'FORM': - return None - if h[8:12] == 'AIFC': - fmt = 'aifc' - elif h[8:12] == 'AIFF': - fmt = 'aiff' - else: - return None - f.seek(0) - try: - a = aifc.openfp(f, 'r') - except (EOFError, aifc.Error): - return None - return (fmt, a.getframerate(), a.getnchannels(), \ - a.getnframes(), 8*a.getsampwidth()) - -tests.append(test_aifc) - - -def test_au(h, f): - if h[:4] == '.snd': - f = get_long_be - elif h[:4] in ('\0ds.', 'dns.'): - f = get_long_le - else: - return None - type = 'au' - hdr_size = f(h[4:8]) - data_size = f(h[8:12]) - encoding = f(h[12:16]) - rate = f(h[16:20]) - nchannels = f(h[20:24]) - sample_size = 1 # default - if encoding == 1: - sample_bits = 'U' - elif encoding == 2: - sample_bits = 8 - elif encoding == 3: - sample_bits = 16 - sample_size = 2 - else: - sample_bits = '?' - frame_size = sample_size * nchannels - return type, rate, nchannels, data_size//frame_size, sample_bits - -tests.append(test_au) - - -def test_hcom(h, f): - if h[65:69] != 'FSSD' or h[128:132] != 'HCOM': - return None - divisor = get_long_be(h[128+16:128+20]) - return 'hcom', 22050//divisor, 1, -1, 8 - -tests.append(test_hcom) - - -def test_voc(h, f): - if h[:20] != 'Creative Voice File\032': - return None - sbseek = get_short_le(h[20:22]) - rate = 0 - if 0 <= sbseek < 500 and h[sbseek] == '\1': - ratecode = ord(h[sbseek+4]) - rate = int(1000000.0 / (256 - ratecode)) - return 'voc', rate, 1, -1, 8 - -tests.append(test_voc) - - -def test_wav(h, f): - # 'RIFF' <len> 'WAVE' 'fmt ' <len> - if h[:4] != 'RIFF' or h[8:12] != 'WAVE' or h[12:16] != 'fmt ': - return None - style = get_short_le(h[20:22]) - nchannels = get_short_le(h[22:24]) - rate = get_long_le(h[24:28]) - sample_bits = get_short_le(h[34:36]) - return 'wav', rate, nchannels, -1, sample_bits - -tests.append(test_wav) - - -def test_8svx(h, f): - if h[:4] != 'FORM' or h[8:12] != '8SVX': - return None - # Should decode it to get #channels -- assume always 1 - return '8svx', 0, 1, 0, 8 - -tests.append(test_8svx) - - -def test_sndt(h, f): - if h[:5] == 'SOUND': - nsamples = get_long_le(h[8:12]) - rate = get_short_le(h[20:22]) - return 'sndt', rate, 1, nsamples, 8 - -tests.append(test_sndt) - - -def test_sndr(h, f): - if h[:2] == '\0\0': - rate = get_short_le(h[2:4]) - if 4000 <= rate <= 25000: - return 'sndr', rate, 1, -1, 8 - -tests.append(test_sndr) - - -#---------------------------------------------# -# Subroutines to extract numbers from strings # -#---------------------------------------------# - -def get_long_be(s): - return (ord(s[0])<<24) | (ord(s[1])<<16) | (ord(s[2])<<8) | ord(s[3]) - -def get_long_le(s): - return (ord(s[3])<<24) | (ord(s[2])<<16) | (ord(s[1])<<8) | ord(s[0]) - -def get_short_be(s): - return (ord(s[0])<<8) | ord(s[1]) - -def get_short_le(s): - return (ord(s[1])<<8) | ord(s[0]) - - -#--------------------# -# Small test program # -#--------------------# - -def test(): - import sys - recursive = 0 - if sys.argv[1:] and sys.argv[1] == '-r': - del sys.argv[1:2] - recursive = 1 - try: - if sys.argv[1:]: - testall(sys.argv[1:], recursive, 1) - else: - testall(['.'], recursive, 1) - except KeyboardInterrupt: - sys.stderr.write('\n[Interrupted]\n') - sys.exit(1) - -def testall(list, recursive, toplevel): - import sys - import os - for filename in list: - if os.path.isdir(filename): - print filename + '/:', - if recursive or toplevel: - print 'recursing down:' - import glob - names = glob.glob(os.path.join(filename, '*')) - testall(names, recursive, 0) - else: - print '*** directory (use -r) ***' - else: - print filename + ':', - sys.stdout.flush() - try: - print what(filename) - except IOError: - print '*** not found ***' - -if __name__ == '__main__': - test() |