def test_replace_continued(self):
# take a partial packet and replace it with a new page
# replace() should make it spanning again
fileobj = BytesIO()
pages = [OggPage(), OggPage()]
pages[0].serial = 1
pages[0].sequence = 0
pages[0].complete = False
pages[0].packets = [b"foo"]
pages[1].serial = 1
pages[1].sequence = 1
pages[1].continued = True
pages[1].packets = [b"bar"]
fileobj = BytesIO()
for page in pages:
fileobj.write(page.write())
fileobj.seek(0, 0)
pages_from_file = [OggPage(fileobj), OggPage(fileobj)]
self.assertEqual(OggPage.to_packets(pages_from_file), [b"foobar"])
packets_part = OggPage.to_packets([pages_from_file[0]])
self.assertEqual(packets_part, [b"foo"])
new_pages = OggPage.from_packets([b"quuux"])
OggPage.replace(fileobj, [pages_from_file[0]], new_pages)
fileobj.seek(0, 0)
written = OggPage.to_packets([OggPage(fileobj), OggPage(fileobj)])
self.assertEquals(written, [b"quuuxbar"])
def _inject(self, fileobj):
"""Write tag data into the Speex comment packet/page."""
fileobj.seek(0)
# Find the first header page, with the stream info.
# Use it to get the serial number.
page = OggPage(fileobj)
while not page.packets[0].startswith("Speex "):
page = OggPage(fileobj)
# Look for the next page with that serial number, it'll start
# the comment packet.
serial = page.serial
page = OggPage(fileobj)
while page.serial != serial:
page = OggPage(fileobj)
# Then find all the pages with the comment packet.
old_pages = [page]
while not (old_pages[-1].complete or len(old_pages[-1].packets) > 1):
page = OggPage(fileobj)
if page.serial == old_pages[0].serial:
old_pages.append(page)
packets = OggPage.to_packets(old_pages, strict=False)
# Set the new comment packet.
packets[0] = self.write(framing=False)
new_pages = OggPage.from_packets(packets, old_pages[0].sequence)
OggPage.replace(fileobj, old_pages, new_pages)
def _inject(self, fileobj, padding_func):
"""Write tag data into the Theora comment packet/page."""
fileobj.seek(0)
page = OggPage(fileobj)
while not page.packets[0].startswith(b"\x81theora"):
page = OggPage(fileobj)
old_pages = [page]
while not (old_pages[-1].complete or len(old_pages[-1].packets) > 1):
page = OggPage(fileobj)
if page.serial == old_pages[0].serial:
old_pages.append(page)
packets = OggPage.to_packets(old_pages, strict=False)
content_size = get_size(fileobj) - len(packets[0]) # approx
vcomment_data = b"\x81theora" + self.write(framing=False)
padding_left = len(packets[0]) - len(vcomment_data)
info = PaddingInfo(padding_left, content_size)
new_padding = info._get_padding(padding_func)
packets[0] = vcomment_data + b"\x00" * new_padding
new_pages = OggPage._from_packets_try_preserve(packets, old_pages)
OggPage.replace(fileobj, old_pages, new_pages)
def _inject(self, fileobj):
"""Write tag data into the FLAC Vorbis comment packet/page."""
# Ogg FLAC has no convenient data marker like Vorbis, but the
# second packet - and second page - must be the comment data.
fileobj.seek(0)
page = OggPage(fileobj)
while not page.packets[0].startswith("\x7FFLAC"):
page = OggPage(fileobj)
first_page = page
while not (page.sequence == 1 and page.serial == first_page.serial):
page = OggPage(fileobj)
old_pages = [page]
while not (old_pages[-1].complete or len(old_pages[-1].packets) > 1):
page = OggPage(fileobj)
if page.serial == first_page.serial:
old_pages.append(page)
packets = OggPage.to_packets(old_pages, strict=False)
# Set the new comment block.
data = self.write()
data = packets[0][0] + struct.pack(">I", len(data))[-3:] + data
packets[0] = data
new_pages = OggPage.from_packets(packets, old_pages[0].sequence)
OggPage.replace(fileobj, old_pages, new_pages)
def _inject(self, fileobj, padding_func):
"""Write tag data into the Theora comment packet/page."""
fileobj.seek(0)
page = OggPage(fileobj)
while not page.packets or \
not page.packets[0].startswith(b"\x81theora"):
page = OggPage(fileobj)
old_pages = [page]
while not (old_pages[-1].complete or len(old_pages[-1].packets) > 1):
page = OggPage(fileobj)
if page.serial == old_pages[0].serial:
old_pages.append(page)
packets = OggPage.to_packets(old_pages, strict=False)
content_size = get_size(fileobj) - len(packets[0]) # approx
vcomment_data = b"\x81theora" + self.write(framing=False)
padding_left = len(packets[0]) - len(vcomment_data)
info = PaddingInfo(padding_left, content_size)
new_padding = info._get_padding(padding_func)
packets[0] = vcomment_data + b"\x00" * new_padding
new_pages = OggPage._from_packets_try_preserve(packets, old_pages)
OggPage.replace(fileobj, old_pages, new_pages)
def _inject(self, fileobj):
"""Write tag data into the Speex comment packet/page."""
fileobj.seek(0)
# Find the first header page, with the stream info.
# Use it to get the serial number.
page = OggPage(fileobj)
while not page.packets[0].startswith(b"Speex "):
page = OggPage(fileobj)
# Look for the next page with that serial number, it'll start
# the comment packet.
serial = page.serial
page = OggPage(fileobj)
while page.serial != serial:
page = OggPage(fileobj)
# Then find all the pages with the comment packet.
old_pages = [page]
while not (old_pages[-1].complete or len(old_pages[-1].packets) > 1):
page = OggPage(fileobj)
if page.serial == old_pages[0].serial:
old_pages.append(page)
packets = OggPage.to_packets(old_pages, strict=False)
# Set the new comment packet.
packets[0] = self.write(framing=False)
new_pages = OggPage.from_packets(packets, old_pages[0].sequence)
OggPage.replace(fileobj, old_pages, new_pages)
def _inject(self, fileobj, padding_func):
"""Write tag data into the Vorbis comment packet/page."""
# Find the old pages in the file; we'll need to remove them,
# plus grab any stray setup packet data out of them.
fileobj.seek(0)
page = OggPage(fileobj)
while not page.packets[0].startswith(b"\x03vorbis"):
page = OggPage(fileobj)
old_pages = [page]
while not (old_pages[-1].complete or len(old_pages[-1].packets) > 1):
page = OggPage(fileobj)
if page.serial == old_pages[0].serial:
old_pages.append(page)
packets = OggPage.to_packets(old_pages, strict=False)
content_size = get_size(fileobj) - len(packets[0]) # approx
vcomment_data = b"\x03vorbis" + self.write()
padding_left = len(packets[0]) - len(vcomment_data)
info = PaddingInfo(padding_left, content_size)
new_padding = info._get_padding(padding_func)
# Set the new comment packet.
packets[0] = vcomment_data + b"\x00" * new_padding
new_pages = OggPage._from_packets_try_preserve(packets, old_pages)
OggPage.replace(fileobj, old_pages, new_pages)
def _inject(self, fileobj):
"""Write tag data into the FLAC Vorbis comment packet/page."""
# Ogg FLAC has no convenient data marker like Vorbis, but the
# second packet - and second page - must be the comment data.
fileobj.seek(0)
page = OggPage(fileobj)
while not page.packets[0].startswith(b"\x7FFLAC"):
page = OggPage(fileobj)
first_page = page
while not (page.sequence == 1 and page.serial == first_page.serial):
page = OggPage(fileobj)
old_pages = [page]
while not (old_pages[-1].complete or len(old_pages[-1].packets) > 1):
page = OggPage(fileobj)
if page.serial == first_page.serial:
old_pages.append(page)
packets = OggPage.to_packets(old_pages, strict=False)
# Set the new comment block.
data = self.write()
data = bytes((packets[0][0],)) + struct.pack(">I", len(data))[-3:] + data
packets[0] = data
new_pages = OggPage.from_packets(packets, old_pages[0].sequence)
OggPage.replace(fileobj, old_pages, new_pages)
def test_replace_continued(self):
# take a partial packet and replace it with a new page
# replace() should make it spanning again
fileobj = BytesIO()
pages = [OggPage(), OggPage()]
pages[0].serial = 1
pages[0].sequence = 0
pages[0].complete = False
pages[0].packets = [b"foo"]
pages[1].serial = 1
pages[1].sequence = 1
pages[1].continued = True
pages[1].packets = [b"bar"]
fileobj = BytesIO()
for page in pages:
fileobj.write(page.write())
fileobj.seek(0, 0)
pages_from_file = [OggPage(fileobj), OggPage(fileobj)]
self.assertEqual(OggPage.to_packets(pages_from_file), [b"foobar"])
packets_part = OggPage.to_packets([pages_from_file[0]])
self.assertEqual(packets_part, [b"foo"])
new_pages = OggPage.from_packets([b"quuux"])
OggPage.replace(fileobj, [pages_from_file[0]], new_pages)
fileobj.seek(0, 0)
written = OggPage.to_packets([OggPage(fileobj), OggPage(fileobj)])
self.assertEquals(written, [b"quuuxbar"])
def _inject(self, fileobj, padding_func):
"""Write tag data into the Vorbis comment packet/page."""
# Find the old pages in the file; we'll need to remove them,
# plus grab any stray setup packet data out of them.
fileobj.seek(0)
page = OggPage(fileobj)
while not page.packets[0].startswith(b"\x03vorbis"):
page = OggPage(fileobj)
old_pages = [page]
while not (old_pages[-1].complete or len(old_pages[-1].packets) > 1):
page = OggPage(fileobj)
if page.serial == old_pages[0].serial:
old_pages.append(page)
packets = OggPage.to_packets(old_pages, strict=False)
content_size = get_size(fileobj) - len(packets[0]) # approx
vcomment_data = b"\x03vorbis" + self.write()
padding_left = len(packets[0]) - len(vcomment_data)
info = PaddingInfo(padding_left, content_size)
new_padding = info._get_padding(padding_func)
# Set the new comment packet.
packets[0] = vcomment_data + b"\x00" * new_padding
new_pages = OggPage._from_packets_try_preserve(packets, old_pages)
OggPage.replace(fileobj, old_pages, new_pages)
def _inject(self, fileobj):
fileobj.seek(0)
info = OggOpusInfo(fileobj)
old_pages = self.__get_comment_pages(fileobj, info)
packets = OggPage.to_packets(old_pages)
packets[0] = "OpusTags" + self.write(framing=False)
new_pages = OggPage.from_packets(packets, old_pages[0].sequence)
OggPage.replace(fileobj, old_pages, new_pages)
def _inject(self, fileobj):
fileobj.seek(0)
info = OggOpusInfo(fileobj)
old_pages = self.__get_comment_pages(fileobj, info)
packets = OggPage.to_packets(old_pages)
packets[0] = b"OpusTags" + self.write(framing=False)
new_pages = OggPage.from_packets(packets, old_pages[0].sequence)
OggPage.replace(fileobj, old_pages, new_pages)
def test_replace_fast_path(self):
# create interleaved pages
fileobj = BytesIO()
pages = [OggPage(), OggPage(), OggPage()]
pages[0].serial = 42
pages[0].sequence = 0
pages[0].packets = [b"foo"]
pages[1].serial = 24
pages[1].sequence = 0
pages[1].packets = [b"bar"]
pages[2].serial = 42
pages[2].sequence = 1
pages[2].packets = [b"baz"]
for page in pages:
fileobj.write(page.write())
fileobj.seek(0, 0)
pages_from_file = [
OggPage(fileobj),
OggPage(fileobj),
OggPage(fileobj)
]
old_pages = [pages_from_file[0], pages_from_file[2]]
packets = OggPage.to_packets(old_pages, strict=True)
self.assertEqual(packets, [b"foo", b"baz"])
new_packets = [b"111", b"222"]
new_pages = OggPage._from_packets_try_preserve(new_packets, old_pages)
self.assertEqual(len(new_pages), 2)
# remove insert_bytes, so we can be sure the fast path was taken
old_insert_bytes = _util.insert_bytes
_util.insert_bytes = None
try:
OggPage.replace(fileobj, old_pages, new_pages)
finally:
_util.insert_bytes = old_insert_bytes
# validate that the new data was written and the other pages
# are untouched
fileobj.seek(0, 0)
pages_from_file = [
OggPage(fileobj),
OggPage(fileobj),
OggPage(fileobj)
]
packets = OggPage.to_packets([pages_from_file[0], pages_from_file[2]],
strict=True)
self.assertEqual(packets, [b"111", b"222"])
packets = OggPage.to_packets([pages_from_file[1]], strict=True)
self.assertEqual(packets, [b"bar"])
def test_replace_fast_path(self):
# create interleaved pages
fileobj = BytesIO()
pages = [OggPage(), OggPage(), OggPage()]
pages[0].serial = 42
pages[0].sequence = 0
pages[0].packets = [b"foo"]
pages[1].serial = 24
pages[1].sequence = 0
pages[1].packets = [b"bar"]
pages[2].serial = 42
pages[2].sequence = 1
pages[2].packets = [b"baz"]
for page in pages:
fileobj.write(page.write())
fileobj.seek(0, 0)
pages_from_file = [OggPage(fileobj), OggPage(fileobj),
OggPage(fileobj)]
old_pages = [pages_from_file[0], pages_from_file[2]]
packets = OggPage.to_packets(old_pages, strict=True)
self.assertEqual(packets, [b"foo", b"baz"])
new_packets = [b"111", b"222"]
new_pages = OggPage._from_packets_try_preserve(new_packets, old_pages)
self.assertEqual(len(new_pages), 2)
# remove insert_bytes, so we can be sure the fast path was taken
old_insert_bytes = _util.insert_bytes
_util.insert_bytes = None
try:
OggPage.replace(fileobj, old_pages, new_pages)
finally:
_util.insert_bytes = old_insert_bytes
# validate that the new data was written and the other pages
# are untouched
fileobj.seek(0, 0)
pages_from_file = [OggPage(fileobj), OggPage(fileobj),
OggPage(fileobj)]
packets = OggPage.to_packets(
[pages_from_file[0], pages_from_file[2]], strict=True)
self.assertEqual(packets, [b"111", b"222"])
packets = OggPage.to_packets([pages_from_file[1]], strict=True)
self.assertEqual(packets, [b"bar"])
def _inject(self, fileobj):
"""Write tag data into the Theora comment packet/page."""
fileobj.seek(0)
page = OggPage(fileobj)
while not page.packets[0].startswith("\x81theora"):
page = OggPage(fileobj)
old_pages = [page]
while not (old_pages[-1].complete or len(old_pages[-1].packets) > 1):
page = OggPage(fileobj)
if page.serial == old_pages[0].serial:
old_pages.append(page)
packets = OggPage.to_packets(old_pages, strict=False)
packets[0] = "\x81theora" + self.write(framing=False)
new_pages = OggPage.from_packets(packets, old_pages[0].sequence)
OggPage.replace(fileobj, old_pages, new_pages)
def _inject(self, fileobj):
"""Write tag data into the Theora comment packet/page."""
fileobj.seek(0)
page = OggPage(fileobj)
while not page.packets[0].startswith("\x81theora"):
page = OggPage(fileobj)
old_pages = [page]
while not (old_pages[-1].complete or len(old_pages[-1].packets) > 1):
page = OggPage(fileobj)
if page.serial == old_pages[0].serial:
old_pages.append(page)
packets = OggPage.to_packets(old_pages, strict=False)
packets[0] = "\x81theora" + self.write(framing=False)
new_pages = OggPage.from_packets(packets, old_pages[0].sequence)
OggPage.replace(fileobj, old_pages, new_pages)
def _inject(self, fileobj, padding_func):
fileobj.seek(0)
info = OggOpusInfo(fileobj)
old_pages = self.__get_comment_pages(fileobj, info)
packets = OggPage.to_packets(old_pages)
vcomment_data = b"OpusTags" + self.write(framing=False)
if self._pad_data:
# if we have padding data to preserver we can't add more padding
# as long as we don't know the structure of what follows
packets[0] = vcomment_data + self._pad_data
else:
content_size = get_size(fileobj) - len(packets[0]) # approx
padding_left = len(packets[0]) - len(vcomment_data)
info = PaddingInfo(padding_left, content_size)
new_padding = info._get_padding(padding_func)
packets[0] = vcomment_data + b"\x00" * new_padding
new_pages = OggPage._from_packets_try_preserve(packets, old_pages)
OggPage.replace(fileobj, old_pages, new_pages)
def test_preserve_non_padding(self):
self.audio["FOO"] = ["BAR"]
self.audio.save()
extra_data = b"\xde\xad\xbe\xef"
with open(self.filename, "r+b") as fobj:
OggPage(fobj) # header
page = OggPage(fobj)
data = OggPage.to_packets([page])[0]
data = data.rstrip(b"\x00") + b"\x01" + extra_data
new_pages = OggPage.from_packets([data], page.sequence)
OggPage.replace(fobj, [page], new_pages)
OggOpus(self.filename).save()
with open(self.filename, "rb") as fobj:
OggPage(fobj) # header
page = OggPage(fobj)
data = OggPage.to_packets([page])[0]
self.assertTrue(data.endswith(b"\x01" + extra_data))
def _inject(self, fileobj, padding_func):
fileobj.seek(0)
info = OggOpusInfo(fileobj)
old_pages = self.__get_comment_pages(fileobj, info)
packets = OggPage.to_packets(old_pages)
vcomment_data = b"OpusTags" + self.write(framing=False)
if self._pad_data:
# if we have padding data to preserver we can't add more padding
# as long as we don't know the structure of what follows
packets[0] = vcomment_data + self._pad_data
else:
content_size = get_size(fileobj) - len(packets[0]) # approx
padding_left = len(packets[0]) - len(vcomment_data)
info = PaddingInfo(padding_left, content_size)
new_padding = info._get_padding(padding_func)
packets[0] = vcomment_data + b"\x00" * new_padding
new_pages = OggPage._from_packets_try_preserve(packets, old_pages)
OggPage.replace(fileobj, old_pages, new_pages)
def test_replace(self):
# create interleaved pages
fileobj = BytesIO()
pages = [OggPage(), OggPage(), OggPage()]
pages[0].serial = 42
pages[0].sequence = 0
pages[0].packets = [b"foo"]
pages[1].serial = 24
pages[1].sequence = 0
pages[1].packets = [b"bar"]
pages[2].serial = 42
pages[2].sequence = 1
pages[2].packets = [b"baz"]
for page in pages:
fileobj.write(page.write())
fileobj.seek(0, 0)
pages_from_file = [
OggPage(fileobj),
OggPage(fileobj),
OggPage(fileobj)
]
old_pages = [pages_from_file[0], pages_from_file[2]]
packets = OggPage.to_packets(old_pages, strict=True)
self.assertEqual(packets, [b"foo", b"baz"])
new_packets = [b"1111", b"2222"]
new_pages = OggPage.from_packets(new_packets,
sequence=old_pages[0].sequence)
self.assertEqual(len(new_pages), 1)
OggPage.replace(fileobj, old_pages, new_pages)
fileobj.seek(0, 0)
first = OggPage(fileobj)
self.assertEqual(first.serial, 42)
self.assertEqual(OggPage.to_packets([first], strict=True),
[b"1111", b"2222"])
second = OggPage(fileobj)
self.assertEqual(second.serial, 24)
self.assertEqual(OggPage.to_packets([second], strict=True), [b"bar"])
def _inject(self, fileobj, padding_func):
"""Write tag data into the Speex comment packet/page."""
fileobj.seek(0)
# Find the first header page, with the stream info.
# Use it to get the serial number.
page = OggPage(fileobj)
while not page.packets[0].startswith(b"Speex "):
page = OggPage(fileobj)
# Look for the next page with that serial number, it'll start
# the comment packet.
serial = page.serial
page = OggPage(fileobj)
while page.serial != serial:
page = OggPage(fileobj)
# Then find all the pages with the comment packet.
old_pages = [page]
while not (old_pages[-1].complete or len(old_pages[-1].packets) > 1):
page = OggPage(fileobj)
if page.serial == old_pages[0].serial:
old_pages.append(page)
packets = OggPage.to_packets(old_pages, strict=False)
content_size = get_size(fileobj) - len(packets[0]) # approx
vcomment_data = self.write(framing=False)
padding_left = len(packets[0]) - len(vcomment_data)
info = PaddingInfo(padding_left, content_size)
new_padding = info._get_padding(padding_func)
# Set the new comment packet.
packets[0] = vcomment_data + b"\x00" * new_padding
new_pages = OggPage._from_packets_try_preserve(packets, old_pages)
OggPage.replace(fileobj, old_pages, new_pages)
def _inject(self, fileobj, padding_func):
"""Write tag data into the Speex comment packet/page."""
fileobj.seek(0)
# Find the first header page, with the stream info.
# Use it to get the serial number.
page = OggPage(fileobj)
while not page.packets[0].startswith(b"Speex "):
page = OggPage(fileobj)
# Look for the next page with that serial number, it'll start
# the comment packet.
serial = page.serial
page = OggPage(fileobj)
while page.serial != serial:
page = OggPage(fileobj)
# Then find all the pages with the comment packet.
old_pages = [page]
while not (old_pages[-1].complete or len(old_pages[-1].packets) > 1):
page = OggPage(fileobj)
if page.serial == old_pages[0].serial:
old_pages.append(page)
packets = OggPage.to_packets(old_pages, strict=False)
content_size = get_size(fileobj) - len(packets[0]) # approx
vcomment_data = self.write(framing=False)
padding_left = len(packets[0]) - len(vcomment_data)
info = PaddingInfo(padding_left, content_size)
new_padding = info._get_padding(padding_func)
# Set the new comment packet.
packets[0] = vcomment_data + b"\x00" * new_padding
new_pages = OggPage._from_packets_try_preserve(packets, old_pages)
OggPage.replace(fileobj, old_pages, new_pages)
def _inject(self, fileobj):
"""Write tag data into the Vorbis comment packet/page."""
# Find the old pages in the file; we'll need to remove them,
# plus grab any stray setup packet data out of them.
fileobj.seek(0)
page = OggPage(fileobj)
while not page.packets[0].startswith(b"\x03vorbis"):
page = OggPage(fileobj)
old_pages = [page]
while not (old_pages[-1].complete or len(old_pages[-1].packets) > 1):
page = OggPage(fileobj)
if page.serial == old_pages[0].serial:
old_pages.append(page)
packets = OggPage.to_packets(old_pages, strict=False)
# Set the new comment packet.
packets[0] = b"\x03vorbis" + self.write()
new_pages = OggPage.from_packets(packets, old_pages[0].sequence)
OggPage.replace(fileobj, old_pages, new_pages)
def test_replace(self):
# create interleaved pages
fileobj = BytesIO()
pages = [OggPage(), OggPage(), OggPage()]
pages[0].serial = 42
pages[0].sequence = 0
pages[0].packets = [b"foo"]
pages[1].serial = 24
pages[1].sequence = 0
pages[1].packets = [b"bar"]
pages[2].serial = 42
pages[2].sequence = 1
pages[2].packets = [b"baz"]
for page in pages:
fileobj.write(page.write())
fileobj.seek(0, 0)
pages_from_file = [OggPage(fileobj), OggPage(fileobj),
OggPage(fileobj)]
old_pages = [pages_from_file[0], pages_from_file[2]]
packets = OggPage.to_packets(old_pages, strict=True)
self.assertEqual(packets, [b"foo", b"baz"])
new_packets = [b"1111", b"2222"]
new_pages = OggPage.from_packets(new_packets,
sequence=old_pages[0].sequence)
self.assertEqual(len(new_pages), 1)
OggPage.replace(fileobj, old_pages, new_pages)
fileobj.seek(0, 0)
first = OggPage(fileobj)
self.assertEqual(first.serial, 42)
self.assertEqual(OggPage.to_packets([first], strict=True),
[b"1111", b"2222"])
second = OggPage(fileobj)
self.assertEqual(second.serial, 24)
self.assertEqual(OggPage.to_packets([second], strict=True), [b"bar"])
def test_streaminfo_bad_version(self):
page = OggPage(open(self.filename, "rb")).write()
page = page.replace(b"\x01\x00", b"\x02\x00", 1)
self.failUnlessRaises(IOError, OggFLACStreamInfo, cBytesIO(page))
def test_streaminfo_bad_marker(self):
page = OggPage(open(self.filename, "rb")).write()
page = page.replace(b"fLaC", b"!fLa", 1)
self.failUnlessRaises(IOError, OggFLACStreamInfo, cBytesIO(page))
def test_streaminfo_bad_marker(self):
page = OggPage(open(self.filename, "rb")).write()
page = page.replace(b"fLaC", b"!fLa", 1)
self.failUnlessRaises(IOError, OggFLACStreamInfo, cBytesIO(page))
def test_streaminfo_bad_version(self):
page = OggPage(open(self.filename, "rb")).write()
page = page.replace(b"\x01\x00", b"\x02\x00", 1)
self.failUnlessRaises(IOError, OggFLACStreamInfo, cBytesIO(page))