Issue #19131: The aifc module now correctly reads and writes sampwidth of
compressed streams.
diff --git a/Lib/aifc.py b/Lib/aifc.py
index 12c665f..f4c196c 100644
--- a/Lib/aifc.py
+++ b/Lib/aifc.py
@@ -480,7 +480,7 @@
pass
else:
self._convert = self._adpcm2lin
- self._framesize = self._framesize // 4
+ self._sampwidth = 2
return
# for ULAW and ALAW try Compression Library
try:
@@ -490,21 +490,20 @@
try:
import audioop
self._convert = self._ulaw2lin
- self._framesize = self._framesize // 2
+ self._sampwidth = 2
return
except ImportError:
pass
raise Error, 'cannot read compressed AIFF-C files'
if self._comptype == 'ULAW':
scheme = cl.G711_ULAW
- self._framesize = self._framesize // 2
elif self._comptype == 'ALAW':
scheme = cl.G711_ALAW
- self._framesize = self._framesize // 2
else:
raise Error, 'unsupported compression type'
self._decomp = cl.OpenDecompressor(scheme)
self._convert = self._decomp_data
+ self._sampwidth = 2
else:
self._comptype = 'NONE'
self._compname = 'not compressed'
@@ -867,7 +866,10 @@
_write_short(self._file, self._nchannels)
self._nframes_pos = self._file.tell()
_write_ulong(self._file, self._nframes)
- _write_short(self._file, self._sampwidth * 8)
+ if self._comptype in ('ULAW', 'ALAW', 'G722'):
+ _write_short(self._file, 8)
+ else:
+ _write_short(self._file, self._sampwidth * 8)
_write_float(self._file, self._framerate)
if self._aifc:
self._file.write(self._comptype)
diff --git a/Misc/NEWS b/Misc/NEWS
index 144e801..d23f7cc 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -32,6 +32,9 @@
Library
-------
+- Issue #19131: The aifc module now correctly reads and writes sampwidth of
+ compressed streams.
+
- Issue #19158: a rare race in BoundedSemaphore could allow .release() too
often.