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Issue #19641: Added the audioop.byteswap() function to convert big-endian

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samples to little-endian and vice versa.
This commit is contained in:
Serhiy Storchaka 2013-11-23 22:26:01 +02:00
parent 2b38fc187c
commit 3062c9a6c8
10 changed files with 80 additions and 78 deletions
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17
Lib/test/test_audioop.py
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@ -448,6 +448,23 @@ class TestAudioop(unittest.TestCase):
self.assertEqual(audioop.getsample(data, w, 3), maxvalues[w])
self.assertEqual(audioop.getsample(data, w, 4), minvalues[w])
def test_byteswap(self):
swapped_datas = {
1: datas[1],
2: packs[2](0, 0x3412, 0x6745, -0x6646, -0x81, 0x80, -1),
3: packs[3](0, 0x563412, -0x7698bb, 0x7798ba, -0x81, 0x80, -1),
4: packs[4](0, 0x78563412, -0x547698bb, 0x557698ba,
-0x81, 0x80, -1),
}
for w in 1, 2, 3, 4:
self.assertEqual(audioop.byteswap(b'', w), b'')
self.assertEqual(audioop.byteswap(datas[w], w), swapped_datas[w])
self.assertEqual(audioop.byteswap(swapped_datas[w], w), datas[w])
self.assertEqual(audioop.byteswap(bytearray(datas[w]), w),
swapped_datas[w])
self.assertEqual(audioop.byteswap(memoryview(datas[w]), w),
swapped_datas[w])
def test_negativelen(self):
# from issue 3306, previously it segfaulted
self.assertRaises(audioop.error,