def __init__(self, filename):
"""filename is a plain string"""
from audiotools.bitstream import BitstreamReader
from audiotools import ChannelMask
from io import BytesIO
WaveContainer.__init__(self, filename)
try:
f = open(filename, 'rb')
except IOError as msg:
raise InvalidShorten(str(msg))
reader = BitstreamReader(f, 0)
try:
if (reader.parse("4b 8u") != ["ajkg", 2]):
raise InvalidShorten("invalid Shorten header")
except IOError:
raise InvalidShorten("invalid Shorten header")
def read_unsigned(r, c):
MSB = r.unary(1)
LSB = r.read(c)
return MSB * 2 ** c + LSB
def read_long(r):
return read_unsigned(r, read_unsigned(r, 2))
# populate channels and bits_per_sample from Shorten header
(file_type,
self.__channels__,
block_length,
max_LPC,
number_of_means,
bytes_to_skip) = [read_long(reader) for i in range(6)]
if ((1 <= file_type) and (file_type <= 2)):
self.__bits_per_sample__ = 8
elif ((3 <= file_type) and (file_type <= 6)):
self.__bits_per_sample__ = 16
else:
# FIXME
raise InvalidShorten("unsupported Shorten file type")
# setup some default dummy metadata
self.__sample_rate__ = 44100
if (self.__channels__ == 1):
self.__channel_mask__ = ChannelMask(0x4)
elif (self.__channels__ == 2):
self.__channel_mask__ = ChannelMask(0x3)
else:
self.__channel_mask__ = ChannelMask(0)
self.__total_frames__ = 0
# populate sample_rate and total_frames from first VERBATIM command
command = read_unsigned(reader, 2)
if (command == 9):
verbatim_bytes = "".join([chr(read_unsigned(reader, 8) & 0xFF)
for i in range(read_unsigned(reader,
5))])
try:
wave = BitstreamReader(BytesIO(verbatim_bytes), 1)
header = wave.read_bytes(12)
if (header.startswith("RIFF") and header.endswith("WAVE")):
# got RIFF/WAVE header, so parse wave blocks as needed
total_size = len(verbatim_bytes) - 12
while (total_size >= 8):
(chunk_id, chunk_size) = wave.parse("4b 32u")
total_size -= 8
if (chunk_id == 'fmt '):
from audiotools.wav import parse_fmt
(channels,
self.__sample_rate__,
bits_per_sample,
self.__channel_mask__) = parse_fmt(
wave.substream(chunk_size))
elif (chunk_id == 'data'):
self.__total_frames__ = \
(chunk_size //
(self.__channels__ *
(self.__bits_per_sample__ // 8)))
else:
if (chunk_size % 2):
wave.read_bytes(chunk_size + 1)
total_size -= (chunk_size + 1)
else:
wave.read_bytes(chunk_size)
total_size -= chunk_size
except (IOError, ValueError):
pass
try:
aiff = BitstreamReader(BytesIO(verbatim_bytes), 0)
header = aiff.read_bytes(12)
if (header.startswith("FORM") and header.endswith("AIFF")):
# got FORM/AIFF header, so parse aiff blocks as needed
total_size = len(verbatim_bytes) - 12
while (total_size >= 8):
(chunk_id, chunk_size) = aiff.parse("4b 32u")
total_size -= 8
if (chunk_id == 'COMM'):
from audiotools.aiff import parse_comm
(channels,
total_sample_frames,
bits_per_sample,
self.__sample_rate__,
self.__channel_mask__) = parse_comm(
aiff.substream(chunk_size))
elif (chunk_id == 'SSND'):
# subtract 8 bytes for "offset" and "block size"
self.__total_frames__ = \
((chunk_size - 8) //
(self.__channels__ *
(self.__bits_per_sample__ // 8)))
else:
if (chunk_size % 2):
aiff.read_bytes(chunk_size + 1)
total_size -= (chunk_size + 1)
else:
aiff.read_bytes(chunk_size)
total_size -= chunk_size
except IOError:
pass
def read_metadata(self):
from io import BytesIO
command = self.unsigned(2)
if command == 9:
# got verbatim, so read data
verbatim_bytes = ints_to_bytes([self.unsigned(8) & 0xFF
for i in range(self.unsigned(5))])
try:
wave = BitstreamReader(BytesIO(verbatim_bytes), True)
header = wave.read_bytes(12)
if header.startswith(b"RIFF") and header.endswith(b"WAVE"):
# got RIFF/WAVE header, so parse wave blocks as needed
total_size = len(verbatim_bytes) - 12
while total_size > 0:
(chunk_id, chunk_size) = wave.parse("4b 32u")
total_size -= 8
if chunk_id == b'fmt ':
(channels,
self.sample_rate,
bits_per_sample,
channel_mask) = parse_fmt(
wave.substream(chunk_size))
self.channel_mask = int(channel_mask)
return
else:
if chunk_size % 2:
wave.read_bytes(chunk_size + 1)
total_size -= (chunk_size + 1)
else:
wave.read_bytes(chunk_size)
total_size -= chunk_size
else:
# no fmt chunk, so use default metadata
pass
except (IOError, ValueError):
pass
try:
aiff = BitstreamReader(BytesIO(verbatim_bytes), False)
header = aiff.read_bytes(12)
if header.startswith(b"FORM") and header.endswith(b"AIFF"):
# got FORM/AIFF header, so parse aiff blocks as needed
total_size = len(verbatim_bytes) - 12
while total_size > 0:
(chunk_id, chunk_size) = aiff.parse("4b 32u")
total_size -= 8
if chunk_id == b'COMM':
(channels,
total_sample_frames,
bits_per_sample,
self.sample_rate,
channel_mask) = parse_comm(
aiff.substream(chunk_size))
self.channel_mask = int(channel_mask)
return
else:
if chunk_size % 2:
aiff.read_bytes(chunk_size + 1)
total_size -= (chunk_size + 1)
else:
aiff.read_bytes(chunk_size)
total_size -= chunk_size
else:
# no COMM chunk, so use default metadata
pass
except IOError:
pass
# got something else, so invent some PCM parameters
self.sample_rate = 44100
if self.channels == 1:
self.channel_mask = 0x4
elif self.channels == 2:
self.channel_mask = 0x3
else:
self.channel_mask = 0
def read_metadata(self):
from io import BytesIO
command = self.unsigned(2)
if (command == 9):
# got verbatim, so read data
verbatim_bytes = ints_to_bytes(
[self.unsigned(8) & 0xFF for i in range(self.unsigned(5))])
try:
wave = BitstreamReader(BytesIO(verbatim_bytes), True)
header = wave.read_bytes(12)
if (header.startswith(b"RIFF") and header.endswith(b"WAVE")):
# got RIFF/WAVE header, so parse wave blocks as needed
total_size = len(verbatim_bytes) - 12
while (total_size > 0):
(chunk_id, chunk_size) = wave.parse("4b 32u")
total_size -= 8
if (chunk_id == b'fmt '):
(channels, self.sample_rate, bits_per_sample,
channel_mask) = parse_fmt(
wave.substream(chunk_size))
self.channel_mask = int(channel_mask)
return
else:
if (chunk_size % 2):
wave.read_bytes(chunk_size + 1)
total_size -= (chunk_size + 1)
else:
wave.read_bytes(chunk_size)
total_size -= chunk_size
else:
# no fmt chunk, so use default metadata
pass
except (IOError, ValueError):
pass
try:
aiff = BitstreamReader(BytesIO(verbatim_bytes), False)
header = aiff.read_bytes(12)
if (header.startswith(b"FORM") and header.endswith(b"AIFF")):
# got FORM/AIFF header, so parse aiff blocks as needed
total_size = len(verbatim_bytes) - 12
while (total_size > 0):
(chunk_id, chunk_size) = aiff.parse("4b 32u")
total_size -= 8
if (chunk_id == b'COMM'):
(channels, total_sample_frames, bits_per_sample,
self.sample_rate, channel_mask) = parse_comm(
aiff.substream(chunk_size))
self.channel_mask = int(channel_mask)
return
else:
if (chunk_size % 2):
aiff.read_bytes(chunk_size + 1)
total_size -= (chunk_size + 1)
else:
aiff.read_bytes(chunk_size)
total_size -= chunk_size
else:
# no COMM chunk, so use default metadata
pass
except IOError:
pass
# got something else, so invent some PCM parameters
self.sample_rate = 44100
if (self.channels == 1):
self.channel_mask = 0x4
elif (self.channels == 2):
self.channel_mask = 0x3
else:
self.channel_mask = 0
def __init__(self, filename):
"""filename is a plain string"""
from audiotools.bitstream import BitstreamReader
from audiotools import ChannelMask
from io import BytesIO
WaveContainer.__init__(self, filename)
try:
f = open(filename, 'rb')
except IOError as msg:
raise InvalidShorten(str(msg))
reader = BitstreamReader(f, 0)
try:
if (reader.parse("4b 8u") != ["ajkg", 2]):
raise InvalidShorten("invalid Shorten header")
except IOError:
raise InvalidShorten("invalid Shorten header")
def read_unsigned(r, c):
MSB = r.unary(1)
LSB = r.read(c)
return MSB * 2**c + LSB
def read_long(r):
return read_unsigned(r, read_unsigned(r, 2))
# populate channels and bits_per_sample from Shorten header
(file_type, self.__channels__, block_length, max_LPC, number_of_means,
bytes_to_skip) = [read_long(reader) for i in range(6)]
if ((1 <= file_type) and (file_type <= 2)):
self.__bits_per_sample__ = 8
elif ((3 <= file_type) and (file_type <= 6)):
self.__bits_per_sample__ = 16
else:
# FIXME
raise InvalidShorten("unsupported Shorten file type")
# setup some default dummy metadata
self.__sample_rate__ = 44100
if (self.__channels__ == 1):
self.__channel_mask__ = ChannelMask(0x4)
elif (self.__channels__ == 2):
self.__channel_mask__ = ChannelMask(0x3)
else:
self.__channel_mask__ = ChannelMask(0)
self.__total_frames__ = 0
# populate sample_rate and total_frames from first VERBATIM command
command = read_unsigned(reader, 2)
if (command == 9):
verbatim_bytes = "".join([
chr(read_unsigned(reader, 8) & 0xFF)
for i in range(read_unsigned(reader, 5))
])
try:
wave = BitstreamReader(BytesIO(verbatim_bytes), 1)
header = wave.read_bytes(12)
if (header.startswith("RIFF") and header.endswith("WAVE")):
# got RIFF/WAVE header, so parse wave blocks as needed
total_size = len(verbatim_bytes) - 12
while (total_size >= 8):
(chunk_id, chunk_size) = wave.parse("4b 32u")
total_size -= 8
if (chunk_id == 'fmt '):
from audiotools.wav import parse_fmt
(channels, self.__sample_rate__, bits_per_sample,
self.__channel_mask__) = parse_fmt(
wave.substream(chunk_size))
elif (chunk_id == 'data'):
self.__total_frames__ = \
(chunk_size //
(self.__channels__ *
(self.__bits_per_sample__ // 8)))
else:
if (chunk_size % 2):
wave.read_bytes(chunk_size + 1)
total_size -= (chunk_size + 1)
else:
wave.read_bytes(chunk_size)
total_size -= chunk_size
except (IOError, ValueError):
pass
try:
aiff = BitstreamReader(BytesIO(verbatim_bytes), 0)
header = aiff.read_bytes(12)
if (header.startswith("FORM") and header.endswith("AIFF")):
# got FORM/AIFF header, so parse aiff blocks as needed
total_size = len(verbatim_bytes) - 12
while (total_size >= 8):
(chunk_id, chunk_size) = aiff.parse("4b 32u")
total_size -= 8
if (chunk_id == 'COMM'):
from audiotools.aiff import parse_comm
(channels, total_sample_frames, bits_per_sample,
self.__sample_rate__,
self.__channel_mask__) = parse_comm(
aiff.substream(chunk_size))
elif (chunk_id == 'SSND'):
# subtract 8 bytes for "offset" and "block size"
self.__total_frames__ = \
((chunk_size - 8) //
(self.__channels__ *
(self.__bits_per_sample__ // 8)))
else:
if (chunk_size % 2):
aiff.read_bytes(chunk_size + 1)
total_size -= (chunk_size + 1)
else:
aiff.read_bytes(chunk_size)
total_size -= chunk_size
except IOError:
pass
def read_metadata(self):
command = self.unsigned(2)
if (command == 9):
# got verbatim, so read data
verbatim_bytes = "".join([chr(self.unsigned(8) & 0xFF)
for i in range(self.unsigned(5))])
try:
wave = BitstreamReader(cStringIO.StringIO(verbatim_bytes), 1)
header = wave.read_bytes(12)
if (header.startswith("RIFF") and header.endswith("WAVE")):
# got RIFF/WAVE header, so parse wave blocks as needed
total_size = len(verbatim_bytes) - 12
while (total_size > 0):
(chunk_id, chunk_size) = wave.parse("4b 32u")
total_size -= 8
if (chunk_id == 'fmt '):
(channels,
self.sample_rate,
bits_per_sample,
channel_mask) = parse_fmt(
wave.substream(chunk_size))
self.channel_mask = int(channel_mask)
return
else:
if (chunk_size % 2):
wave.read_bytes(chunk_size + 1)
total_size -= (chunk_size + 1)
else:
wave.read_bytes(chunk_size)
total_size -= chunk_size
else:
# no fmt chunk, so use default metadata
pass
except (IOError, ValueError):
pass
try:
aiff = BitstreamReader(cStringIO.StringIO(verbatim_bytes), 0)
header = aiff.read_bytes(12)
if (header.startswith("FORM") and header.endswith("AIFF")):
# got FORM/AIFF header, so parse aiff blocks as needed
total_size = len(verbatim_bytes) - 12
while (total_size > 0):
(chunk_id, chunk_size) = aiff.parse("4b 32u")
total_size -= 8
if (chunk_id == 'COMM'):
(channels,
total_sample_frames,
bits_per_sample,
self.sample_rate,
channel_mask) = parse_comm(
aiff.substream(chunk_size))
self.channel_mask = int(channel_mask)
return
else:
if (chunk_size % 2):
aiff.read_bytes(chunk_size + 1)
total_size -= (chunk_size + 1)
else:
aiff.read_bytes(chunk_size)
total_size -= chunk_size
else:
# no COMM chunk, so use default metadata
pass
except IOError:
pass
# got something else, so invent some PCM parameters
self.sample_rate = 44100
if (self.channels == 1):
self.channel_mask = 0x4
elif (self.channels == 2):
self.channel_mask = 0x3
else:
self.channel_mask = 0
