Update build-tools to ab/7064006
https://ci.android.com/builds/branches/aosp-build-tools-release/grid?head=7064006&tail=7064006
Test: treehugger
Change-Id: I4fa4337a1f9c5a347d34725fa4d3cb7256043c98
diff --git a/common/py3-stdlib/sndhdr.py b/common/py3-stdlib/sndhdr.py
new file mode 100644
index 0000000..96595c6
--- /dev/null
+++ b/common/py3-stdlib/sndhdr.py
@@ -0,0 +1,257 @@
+"""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, OSError 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']
+
+from collections import namedtuple
+
+SndHeaders = namedtuple('SndHeaders',
+ 'filetype framerate nchannels nframes sampwidth')
+
+SndHeaders.filetype.__doc__ = ("""The value for type indicates the data type
+and will be one of the strings 'aifc', 'aiff', 'au','hcom',
+'sndr', 'sndt', 'voc', 'wav', '8svx', 'sb', 'ub', or 'ul'.""")
+SndHeaders.framerate.__doc__ = ("""The sampling_rate will be either the actual
+value or 0 if unknown or difficult to decode.""")
+SndHeaders.nchannels.__doc__ = ("""The number of channels or 0 if it cannot be
+determined or if the value is difficult to decode.""")
+SndHeaders.nframes.__doc__ = ("""The value for frames will be either the number
+of frames or -1.""")
+SndHeaders.sampwidth.__doc__ = ("""Either the sample size in bits or
+'A' for A-LAW or 'U' for u-LAW.""")
+
+def what(filename):
+ """Guess the type of a sound file."""
+ res = whathdr(filename)
+ return res
+
+
+def whathdr(filename):
+ """Recognize sound headers."""
+ with open(filename, 'rb') as f:
+ h = f.read(512)
+ for tf in tests:
+ res = tf(h, f)
+ if res:
+ return SndHeaders(*res)
+ return None
+
+
+#-----------------------------------#
+# Subroutines per sound header type #
+#-----------------------------------#
+
+tests = []
+
+def test_aifc(h, f):
+ import aifc
+ if not h.startswith(b'FORM'):
+ return None
+ if h[8:12] == b'AIFC':
+ fmt = 'aifc'
+ elif h[8:12] == b'AIFF':
+ fmt = 'aiff'
+ else:
+ return None
+ f.seek(0)
+ try:
+ a = aifc.open(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.startswith(b'.snd'):
+ func = get_long_be
+ elif h[:4] in (b'\0ds.', b'dns.'):
+ func = get_long_le
+ else:
+ return None
+ filetype = 'au'
+ hdr_size = func(h[4:8])
+ data_size = func(h[8:12])
+ encoding = func(h[12:16])
+ rate = func(h[16:20])
+ nchannels = func(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
+ if frame_size:
+ nframe = data_size / frame_size
+ else:
+ nframe = -1
+ return filetype, rate, nchannels, nframe, sample_bits
+
+tests.append(test_au)
+
+
+def test_hcom(h, f):
+ if h[65:69] != b'FSSD' or h[128:132] != b'HCOM':
+ return None
+ divisor = get_long_be(h[144:148])
+ if divisor:
+ rate = 22050 / divisor
+ else:
+ rate = 0
+ return 'hcom', rate, 1, -1, 8
+
+tests.append(test_hcom)
+
+
+def test_voc(h, f):
+ if not h.startswith(b'Creative Voice File\032'):
+ return None
+ sbseek = get_short_le(h[20:22])
+ rate = 0
+ if 0 <= sbseek < 500 and h[sbseek] == 1:
+ ratecode = 256 - h[sbseek+4]
+ if ratecode:
+ rate = int(1000000.0 / ratecode)
+ return 'voc', rate, 1, -1, 8
+
+tests.append(test_voc)
+
+
+def test_wav(h, f):
+ import wave
+ # 'RIFF' <len> 'WAVE' 'fmt ' <len>
+ if not h.startswith(b'RIFF') or h[8:12] != b'WAVE' or h[12:16] != b'fmt ':
+ return None
+ f.seek(0)
+ try:
+ w = wave.open(f, 'r')
+ except (EOFError, wave.Error):
+ return None
+ return ('wav', w.getframerate(), w.getnchannels(),
+ w.getnframes(), 8*w.getsampwidth())
+
+tests.append(test_wav)
+
+
+def test_8svx(h, f):
+ if not h.startswith(b'FORM') or h[8:12] != b'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.startswith(b'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.startswith(b'\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 bytes #
+#-------------------------------------------#
+
+def get_long_be(b):
+ return (b[0] << 24) | (b[1] << 16) | (b[2] << 8) | b[3]
+
+def get_long_le(b):
+ return (b[3] << 24) | (b[2] << 16) | (b[1] << 8) | b[0]
+
+def get_short_be(b):
+ return (b[0] << 8) | b[1]
+
+def get_short_le(b):
+ return (b[1] << 8) | b[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 + '/:', end=' ')
+ if recursive or toplevel:
+ print('recursing down:')
+ import glob
+ names = glob.glob(os.path.join(glob.escape(filename), '*'))
+ testall(names, recursive, 0)
+ else:
+ print('*** directory (use -r) ***')
+ else:
+ print(filename + ':', end=' ')
+ sys.stdout.flush()
+ try:
+ print(what(filename))
+ except OSError:
+ print('*** not found ***')
+
+if __name__ == '__main__':
+ test()