def test_channels(self):
samples = numpy.arange(200, dtype=numpy.float32).reshape((100, 2))
sndfile = MockSndfile(samples)
self.assertEqual(sndfile.channels, 2)
samples = numpy.arange(200, dtype=numpy.float32)
sndfile = MockSndfile(samples)
self.assertEqual(sndfile.channels, 1)
def test_read_frames(self):
samples = numpy.arange(200).reshape((100, 2))
samples = (samples - 100) / 200.0
sndfile = MockSndfile(samples)
frames = sndfile.read_frames(10)
assert_array_equal(samples[:10, :], frames)
frames = sndfile.read_frames(20)
assert_array_equal(samples[10:30, :], frames)
frames = sndfile.read_frames(70)
assert_array_equal(samples[30:, :], frames)
def test_read_frames(self):
samples = numpy.arange(200).reshape((100, 2))
samples = (samples - 100) / 200.0
sndfile = MockSndfile(samples)
frames = sndfile.read_frames(10)
assert_array_equal(samples[:10, :], frames)
frames = sndfile.read_frames(20)
assert_array_equal(samples[10:30, :], frames)
frames = sndfile.read_frames(70)
assert_array_equal(samples[30:, :], frames)
def __iter__(self):
if isinstance(self.filename, str):
f = audiolab.Sndfile(self.filename)
elif np.iterable(self.filename):
f = MockSndfile(self.filename, samplerate=44100)
else:
raise ValueError, 'Invalid filename: %s' % self.filename
nbuf = self.nbuf
end = self.end
if not end:
end = f.nframes
if not nbuf:
nbuf = 10*f.samplerate
pos = f.seek(self.start)
nremaining = end - pos
while nremaining > 0:
if nremaining < nbuf:
nbuf = nremaining
try:
yield f.read_frames(nbuf)
nremaining -= nbuf
except RuntimeError:
nremaining = 0
f.close()
def test_seek(self):
# Based on TestSeek class from audiolab's test_sndfile.py.
samples = numpy.arange(10000)
sndfile = MockSndfile(samples)
nframes = sndfile.nframes
bufsize = 1024
buf = sndfile.read_frames(bufsize)
sndfile.seek(0)
buf2 = sndfile.read_frames(bufsize)
assert_array_equal(buf, buf2)
# Now, read some frames, go back, and compare buffers
# (check whence == 1 == SEEK_CUR)
sndfile = MockSndfile(samples)
sndfile.read_frames(bufsize)
buf = sndfile.read_frames(bufsize)
sndfile.seek(-bufsize, 1)
buf2 = sndfile.read_frames(bufsize)
assert_array_equal(buf, buf2)
# Now, read some frames, go back, and compare buffers
# (check whence == 2 == SEEK_END)
sndfile = MockSndfile(samples)
buf = sndfile.read_frames(nframes)
sndfile.seek(-bufsize, 2)
buf2 = sndfile.read_frames(bufsize)
assert_array_equal(buf[-bufsize:], buf2)
# Try to seek past the end.
self.assertRaises(IOError, sndfile.seek, len(samples) + 1)
def test_read_frames_past_end(self):
samples = numpy.arange(200)
sndfile = MockSndfile(samples)
self.assertRaises(RuntimeError, sndfile.read_frames, len(samples) + 1)
def test_read_frames_type_conversion(self):
samples = numpy.arange(200, dtype=numpy.float32)
sndfile = MockSndfile(samples)
frames = sndfile.read_frames(len(samples), dtype=numpy.int16)
self.assert_(isinstance(frames[0], numpy.int16))
assert_array_equal(numpy.int16(samples), frames)
def test_seek(self):
# Based on TestSeek class from audiolab's test_sndfile.py.
samples = numpy.arange(10000)
sndfile = MockSndfile(samples)
nframes = sndfile.nframes
bufsize = 1024
buf = sndfile.read_frames(bufsize)
sndfile.seek(0)
buf2 = sndfile.read_frames(bufsize)
assert_array_equal(buf, buf2)
# Now, read some frames, go back, and compare buffers
# (check whence == 1 == SEEK_CUR)
sndfile = MockSndfile(samples)
sndfile.read_frames(bufsize)
buf = sndfile.read_frames(bufsize)
sndfile.seek(-bufsize, 1)
buf2 = sndfile.read_frames(bufsize)
assert_array_equal(buf, buf2)
# Now, read some frames, go back, and compare buffers
# (check whence == 2 == SEEK_END)
sndfile = MockSndfile(samples)
buf = sndfile.read_frames(nframes)
sndfile.seek(-bufsize, 2)
buf2 = sndfile.read_frames(bufsize)
assert_array_equal(buf[-bufsize:], buf2)
# Try to seek past the end.
self.assertRaises(IOError, sndfile.seek, len(samples) + 1)
def test_read_frames_type_conversion(self):
samples = numpy.arange(200, dtype=numpy.float32)
sndfile = MockSndfile(samples)
frames = sndfile.read_frames(len(samples), dtype=numpy.int16)
self.assert_(isinstance(frames[0], numpy.int16))
assert_array_equal(numpy.int16(samples), frames)
