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Issue #5202: Added support for unseekable files in the wave module.

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This commit is contained in:
Serhiy Storchaka 2013-11-16 13:04:00 +02:00
parent a7a34a83f3
commit 7714ebbe0e
5 changed files with 90 additions and 34 deletions
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8
Lib/wave.py
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@ -491,14 +491,18 @@ class Wave_write:
if not self._nframes:
self._nframes = initlength // (self._nchannels * self._sampwidth)
self._datalength = self._nframes * self._nchannels * self._sampwidth
self._form_length_pos = self._file.tell()
try:
self._form_length_pos = self._file.tell()
except (AttributeError, OSError):
self._form_length_pos = None
self._file.write(struct.pack('<L4s4sLHHLLHH4s',
36 + self._datalength, b'WAVE', b'fmt ', 16,
WAVE_FORMAT_PCM, self._nchannels, self._framerate,
self._nchannels * self._framerate * self._sampwidth,
self._nchannels * self._sampwidth,
self._sampwidth * 8, b'data'))
self._data_length_pos = self._file.tell()
if self._form_length_pos is not None:
self._data_length_pos = self._file.tell()
self._file.write(struct.pack('<L', self._datalength))
self._headerwritten = True