# Copyright(c) 2006 Eric Faurot <eric.faurot@gmail.com>
# See LICENSE for details.
# Python 3 adaptation by Maxim Kolosov
#CHAR_CODEC = 'utf-8'
CHAR_CODEC = 'cp1251'
from sys import hexversion
if hexversion < 0x03000000:
_range = xrange
_chr = chr
else:
_range = range
def _chr(value):
return bytes([value])
import struct
_crc = (
0x00000000,0x04c11db7,0x09823b6e,0x0d4326d9,
0x130476dc,0x17c56b6b,0x1a864db2,0x1e475005,
0x2608edb8,0x22c9f00f,0x2f8ad6d6,0x2b4bcb61,
0x350c9b64,0x31cd86d3,0x3c8ea00a,0x384fbdbd,
0x4c11db70,0x48d0c6c7,0x4593e01e,0x4152fda9,
0x5f15adac,0x5bd4b01b,0x569796c2,0x52568b75,
0x6a1936c8,0x6ed82b7f,0x639b0da6,0x675a1011,
0x791d4014,0x7ddc5da3,0x709f7b7a,0x745e66cd,
0x9823b6e0,0x9ce2ab57,0x91a18d8e,0x95609039,
0x8b27c03c,0x8fe6dd8b,0x82a5fb52,0x8664e6e5,
0xbe2b5b58,0xbaea46ef,0xb7a96036,0xb3687d81,
0xad2f2d84,0xa9ee3033,0xa4ad16ea,0xa06c0b5d,
0xd4326d90,0xd0f37027,0xddb056fe,0xd9714b49,
0xc7361b4c,0xc3f706fb,0xceb42022,0xca753d95,
0xf23a8028,0xf6fb9d9f,0xfbb8bb46,0xff79a6f1,
0xe13ef6f4,0xe5ffeb43,0xe8bccd9a,0xec7dd02d,
0x34867077,0x30476dc0,0x3d044b19,0x39c556ae,
0x278206ab,0x23431b1c,0x2e003dc5,0x2ac12072,
0x128e9dcf,0x164f8078,0x1b0ca6a1,0x1fcdbb16,
0x018aeb13,0x054bf6a4,0x0808d07d,0x0cc9cdca,
0x7897ab07,0x7c56b6b0,0x71159069,0x75d48dde,
0x6b93dddb,0x6f52c06c,0x6211e6b5,0x66d0fb02,
0x5e9f46bf,0x5a5e5b08,0x571d7dd1,0x53dc6066,
0x4d9b3063,0x495a2dd4,0x44190b0d,0x40d816ba,
0xaca5c697,0xa864db20,0xa527fdf9,0xa1e6e04e,
0xbfa1b04b,0xbb60adfc,0xb6238b25,0xb2e29692,
0x8aad2b2f,0x8e6c3698,0x832f1041,0x87ee0df6,
0x99a95df3,0x9d684044,0x902b669d,0x94ea7b2a,
0xe0b41de7,0xe4750050,0xe9362689,0xedf73b3e,
0xf3b06b3b,0xf771768c,0xfa325055,0xfef34de2,
0xc6bcf05f,0xc27dede8,0xcf3ecb31,0xcbffd686,
0xd5b88683,0xd1799b34,0xdc3abded,0xd8fba05a,
0x690ce0ee,0x6dcdfd59,0x608edb80,0x644fc637,
0x7a089632,0x7ec98b85,0x738aad5c,0x774bb0eb,
0x4f040d56,0x4bc510e1,0x46863638,0x42472b8f,
0x5c007b8a,0x58c1663d,0x558240e4,0x51435d53,
0x251d3b9e,0x21dc2629,0x2c9f00f0,0x285e1d47,
0x36194d42,0x32d850f5,0x3f9b762c,0x3b5a6b9b,
0x0315d626,0x07d4cb91,0x0a97ed48,0x0e56f0ff,
0x1011a0fa,0x14d0bd4d,0x19939b94,0x1d528623,
0xf12f560e,0xf5ee4bb9,0xf8ad6d60,0xfc6c70d7,
0xe22b20d2,0xe6ea3d65,0xeba91bbc,0xef68060b,
0xd727bbb6,0xd3e6a601,0xdea580d8,0xda649d6f,
0xc423cd6a,0xc0e2d0dd,0xcda1f604,0xc960ebb3,
0xbd3e8d7e,0xb9ff90c9,0xb4bcb610,0xb07daba7,
0xae3afba2,0xaafbe615,0xa7b8c0cc,0xa379dd7b,
0x9b3660c6,0x9ff77d71,0x92b45ba8,0x9675461f,
0x8832161a,0x8cf30bad,0x81b02d74,0x857130c3,
0x5d8a9099,0x594b8d2e,0x5408abf7,0x50c9b640,
0x4e8ee645,0x4a4ffbf2,0x470cdd2b,0x43cdc09c,
0x7b827d21,0x7f436096,0x7200464f,0x76c15bf8,
0x68860bfd,0x6c47164a,0x61043093,0x65c52d24,
0x119b4be9,0x155a565e,0x18197087,0x1cd86d30,
0x029f3d35,0x065e2082,0x0b1d065b,0x0fdc1bec,
0x3793a651,0x3352bbe6,0x3e119d3f,0x3ad08088,
0x2497d08d,0x2056cd3a,0x2d15ebe3,0x29d4f654,
0xc5a92679,0xc1683bce,0xcc2b1d17,0xc8ea00a0,
0xd6ad50a5,0xd26c4d12,0xdf2f6bcb,0xdbee767c,
0xe3a1cbc1,0xe760d676,0xea23f0af,0xeee2ed18,
0xf0a5bd1d,0xf464a0aa,0xf9278673,0xfde69bc4,
0x89b8fd09,0x8d79e0be,0x803ac667,0x84fbdbd0,
0x9abc8bd5,0x9e7d9662,0x933eb0bb,0x97ffad0c,
0xafb010b1,0xab710d06,0xa6322bdf,0xa2f33668,
0xbcb4666d,0xb8757bda,0xb5365d03,0xb1f740b4
)
def checksum(header, body):
reg = 0
for c in header:
reg = ((reg << 8) & 0xffffffff) ^ _crc[ ((reg >> 24) & 0xff) ^ ord(c) ]
for i in (0,0,0,0):
reg = ((reg << 8) & 0xffffffff) ^ _crc[ ((reg >> 24) & 0xff) ^ i ]
for c in body:
reg = ((reg << 8) & 0xffffffff) ^ _crc[ ((reg >> 24) & 0xff) ^ ord(c) ]
return reg
def split_segments(data, segs):
segments = []
start = 0
stop = 0
map_segs = segs
if hexversion < 0x03000000:
map_segs = map(ord, segs)
for length in map_segs:
if length:
stop += length
segments.append(data[start:stop])
start = stop
else:
segments.append(b'')
return segments
def segmentsToPackets(segments):
packets = []
packet = []
for segment in segments:
packet.append(segment)
if len(segment) != 255:
packets.append(b''.join(packet))
packet = []
return packets, packet
class OggPage(object):
version = 0
headerType = None
streamID = None
granulePosition = None
sequenceNumber = None
segments = None
checksum = None
rawData = None
def continued(self):
return self.segments[-1] == 255
continued = property(continued)
def packetCount(self):
return len([s for s in self.segments if len(s) != 255])
def getPackets(self):
return segmentsToPackets(self.segments)
def dataLength(self):
return sum(map(len, self.segments))
def pageOverhead(self):
return 27 + len(self.segments)
def payload(self):
return self.pageOverhead() + self.dataLength()
def pack(self):
header = struct.pack("<4sBBqLL", b'OggS', self.version, self.headerType, self.granulePosition, self.streamID, self.sequenceNumber)
def _(s):
return _chr(len(s))
body = b''.join( [ _chr(len(self.segments)) ] + map(_, self.segments) + self.segments )
return b''.join([ header, struct.pack("<L", checksum(header, body)), body ])
def __repr__(self):
return '<OggPage version=%r headerType=%r streamID=%r granulePosition=%r sequenceNumber=%r continued=%r segments=%r payload=%r>'%(self.version, self.headerType, self.streamID, self.granulePosition, self.sequenceNumber, self.continued, len(self.segments), self.payload())
class iobuffer(object):
def __init__(self, data = b''):
self.data = data
self.offset = 0
self.bytes = 0
self.length = len(data)
def write(self, data):
self.data = b''.join([ self.data[self.offset:], data ])
self.offset = 0
self.length += len(data)
def __len__(self):
return self.length
def read(self, count):
assert self.length >= count
chunk = self.data[self.offset:self.offset+count]
self.length -= count
self.offset += count
self.bytes += len(chunk)
return chunk
def unpack(self, format, size = None):
if size is None:
size = struct.calcsize(format)
return struct.unpack(format, self.read(size))
def unread(self, data):
self.data = b''.join([ data, self.data[self.offset:] ])
self.offset = 0
self.length += len(data)
class Parser(object):
expected = 0
processed = 0
def __init__(self, expected):
self._buffer = iobuffer()
self.expected = expected
def buffered(self):
return self._buffer.data[self._buffer.offset:]
def required(self):
return self.expected - len(self._buffer)
def process(self, data):
self._buffer.write(data)
while len(self._buffer) >= self.expected:
chunk = self._buffer.read(self.expected)
try:
self.expected = self.processChunk(chunk)
self.processed += len(chunk)
except:
raise
def processChunk(self, chunk):
raise NotImplementedError
class OggReader(Parser):
pages = 0
HEADER_LENGTH = 27
def __init__(self):
Parser.__init__(self, self.HEADER_LENGTH)
self.__currentPage = None
self.processChunk = self.processHeader
def processHeader(self, data):
self.__currentPage = p = OggPage()
(magic, p.version, p.headerType, p.granulePosition, p.streamID, p.sequenceNumber, p.checksum, nseg) = struct.unpack("<4sBBqLLLB", data)
if magic != b'OggS':
raise ValueError('Not an ogg page')
self.__raw = [ data ]
self.processChunk = self.processSegmentTable
return nseg
def processSegmentTable(self, data):
self.__segmentTable = data
self.__raw.append(data)
self.processChunk = self.processSegments
if hexversion < 0x03000000:
return sum(map(ord, data))
else:
return sum(data)
def processSegments(self, data):
page = self.__currentPage
page.segments = split_segments(data, self.__segmentTable)
self.__raw.append(data)
page.rawData = b''.join(self.__raw)
self.pageReceived(page)
self.pages += 1
self.processChunk = self.processHeader
return self.HEADER_LENGTH
def outOfBandDataReceived(self, data):
pass
def pageReceived(self, page):
raise NotImplementedError
class OggDemultiplexer(OggReader):
def __init__(self):
OggReader.__init__(self)
self.streams = {}
self.readingHeaders = True
def buildStream(self, packet):
return self.streamFactory(self, packet)
def pageReceived(self, page):
if self.readingHeaders:
if page.headerType & 0x02:
assert page.headerType & 0x01 == 0
assert page.headerType & 0x04 == 0
assert page.streamID not in self.streams
assert not page.continued
packets, left = page.getPackets()
assert len(packets) == 1
stream = self.buildStream(packets[0])
stream.processPage(page)
self.streams[page.streamID] = stream
return
self.readingHeaders = False
assert page.headerType & 0x02 == 0
assert page.streamID in self.streams
stream = self.streams[page.streamID]
stream.processPage(page)
if page.headerType & 0x04:
stream.endStream()
del self.streams[page.streamID]
if len(self.streams) == 0:
self.allStreamsEnded()
def outOfBandPageReceived(self, page):
pass
def allStreamsEnded(self):
self.readingHeaders = True
class SimpleDemultiplexer(OggDemultiplexer):
def __init__(self, streamReader):
OggDemultiplexer.__init__(self)
self.streamReader = streamReader
def buildStream(self, packet):
assert len(self.streams) == 0
return self.streamReader
class VorbisIdentification(object):
version = None
audioChannels = None
sampleRate = None
maximumBitrate = None
nominalBitrate = None
minimumBitrate = None
blocksize = None
#~ PACKET_HEADER = chr(1) + b'vorbis'
PACKET_HEADER = b'\x01vorbis'
def __repr__(self):
return '<VorbisIdentification version=%r audioChannels=%r sampleRate=%r bitrates=[ %r, %r, %r ] blocksize=%r>'%(self.version, self.audioChannels, self.sampleRate, self.minimumBitrate, self.nominalBitrate, self.maximumBitrate, self.blocksize)
def positionToSeconds(self, position):
return float(position) / self.sampleRate
def pack(self):
return ''.join([self.PACKET_HEADER, s.pack("<IBIiiiBB", self.version, self.audioChannels, self.sampleRate, self.maximumBitrate, self.nominalBitrate, self.minimumBitrate, self.blocksize, 1),])
class VorbisComments(object):
vendor = None
comments = None
#~ PACKET_HEADER = chr(3) + b'vorbis'
PACKET_HEADER = b'\x03vorbis'
def pack(self):
vendor = self.vendor.encode(CHAR_CODEC)
data = [ self.PACKET_HEADER, struct.pack("<L", len(vendor)), vendor, struct.pack("<L", len(self.comments)) ]
for key, value in self.comments:
key = key.upper()
value = value.encode(CHAR_CODEC)
data.append(struct.pack("<L", len(key) + 1 + len(value)))
data.append(key)
data.append(b'=')
data.append(value)
data.append(b'\x01')
return ''.join(data)
class VorbisSetup(object):
codebooks = None
timeDomainTransforms = None
floorType = None
residues = None
mappings = None
modes = None
#~ PACKET_HEADER = chr(5) + b'vorbis'
PACKET_HEADER = b'\x05vorbis'
def pack(self):
return self.rawPacket
class OggStreamReader(object):
pages = 0
__segments = None
def endStream(self):
pass
def processPage(self, page):
position = page.granulePosition
if self.__segments is None:
self.__segments = []
self.__segments.extend(page.segments)
packets, self.__segments = segmentsToPackets(self.__segments)
if packets:
self.packetsReceived(packets, position)
else:
assert position == -1
self.pages += 1
def packetsReceived(self, packets, position):
pass
class VorbisStreamReader(OggStreamReader):
identification = None
comments = None
setup = None
def __init__(self):
OggStreamReader.__init__(self)
self.__expected = 'identification'
def packetsReceived(self, packets, position):
if not self.__expected:
return self.audioPacketsReceived(packets, position)
assert position == 0
for packet in packets:
handler = getattr(self, 'read_%s' % self.__expected)
handler(packet)
def read_identification(self, packet):
s = iobuffer(packet)
header = VorbisIdentification.PACKET_HEADER
assert s.read(len(header)) == header
i = VorbisIdentification()
(i.version, i.audioChannels, i.sampleRate, i.maximumBitrate, i.nominalBitrate, i.minimumBitrate, i.blocksize, framingFlag) = s.unpack("<IBIiiiBB")
assert len(s) == 0
self.__expected = 'comments'
self.identificationReceived(i)
def read_comments(self, packet):
s = iobuffer(packet)
header = VorbisComments.PACKET_HEADER
assert s.read(len(header)) == header
length, = s.unpack("<L")
comments = VorbisComments()
comments.vendor = s.read(length).decode(CHAR_CODEC)
comments.comments = []
ncomments, = s.unpack("<L")
for i in _range(ncomments):
length, = s.unpack("<L")
key, value = s.read(length).split(b'=', 1)
comments.comments.append([key.upper(), value.decode(CHAR_CODEC)])
assert s.read(1) == b'\x01'
assert len(s) == 0
self.__expected = 'setup'
self.commentsReceived(comments)
def read_setup(self, packet):
assert packet.startswith(VorbisSetup.PACKET_HEADER)
setup = VorbisSetup()
setup.rawPacket = packet
self.__expected = None
self.setupReceived(setup)
def identificationReceived(self, identification):
self.identification = identification
def commentsReceived(self, comments):
self.comments = comments
def setupReceived(self, setup):
self.setup = setup
def audioPacketsReceived(self, packets, position):
pass
class VorbisStreamInfo(VorbisStreamReader):
lastPosition = None
startPosition = None
payload = 0
overhead = 0
pageCount = 0
audioPackets = 0
audioPacketLength = 0
stop = 0
start = 0
def pageReceived(self, page):
self.pageCount += 1
self.payload += page.payload()
self.overhead += page.pageOverhead()
VorbisStreamReader.pageReceived(self, page)
def audioPacketsReceived(self, packets, position):
if self.startPosition is None:
self.startPosition = position
self.lastPosition = position
self.audioPackets += len(packets)
self.audioPacketLength += sum(map(len, packets))
def identificationReceived(self, identification):
self.identification = identification
def setupReceived(self, setup):
self.setup = setup
def commentsReceived(self, comments):
self.comments = comments
def endStream(self):
self.stop = self.identification.positionToSeconds(self.lastPosition)
self.start = self.identification.positionToSeconds(self.startPosition)
if __name__ == "__main__":
from sys import hexversion
info = VorbisStreamInfo()
stream = SimpleDemultiplexer(info)
stream.process(open('test.ogg', 'rb').read())
print('size : %d' % info.payload)
print('overhead : %d' % info.overhead)
print('pages : %d' % info.pageCount)
print('audio packets : %d' % info.audioPackets)
print('audio length : %d' % info.audioPacketLength)
print('vendor : %s' % info.comments.vendor)
print('comment entries : %d' % len(info.comments.comments))
for key, value in info.comments.comments:
if hexversion < 0x03000000:
print('- %s: %s' % (key, value.encode(CHAR_CODEC)))
else:
print('- %s: %s' % (key, value))
print('sample rate : %d' % info.identification.sampleRate)
print('audio channels : %d' % info.identification.audioChannels)
print('nominal bitrate : %d' % info.identification.nominalBitrate)
print('first frame : %fs' % info.start)
import datetime
print('duration : %s' % datetime.timedelta(seconds=info.stop-info.start))
