RYSEN/read_ambe.py

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3.8 KiB
Python
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from bitarray import bitarray
from itertools import islice
class readAMBE:
def __init__(self, lang,path):
self.lang = lang
self.path = path
self.prefix = path+lang
def _make_bursts(self,data):
it = iter(data)
for i in range(0, len(data), 108):
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yield bitarray([k for k in islice(it, 108)] )
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#Read indexed files
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def readfiles(self):
_AMBE_LENGTH = 9
indexDict = {}
try:
with open(self.prefix+'.indx') as index:
for line in index:
(voice,start,length) = line.split()
indexDict[voice] = [int(start) * _AMBE_LENGTH ,int(length) * _AMBE_LENGTH]
index.close()
except IOError:
return False
ambeBytearray = {}
_wordBitarray = bitarray(endian='big')
_wordBADict = {}
try:
with open(self.prefix+'.ambe','rb') as ambe:
for _voice in indexDict:
ambe.seek(indexDict[_voice][0])
_wordBitarray.frombytes(ambe.read(indexDict[_voice][1]))
#108
_wordBADict[_voice] = []
pairs = 1
_lastburst = ''
for _burst in self._make_bursts(_wordBitarray):
#Not sure if we need to pad or not? Seems to make little difference.
if len(_burst) < 108:
pad = (108 - len(_burst))
for i in range(0,pad,1):
_burst.append(False)
if pairs == 2:
_wordBADict[_voice].append([_lastburst,_burst])
_lastburst = ''
pairs = 1
next
else:
pairs = pairs + 1
_lastburst = _burst
_wordBitarray.clear()
ambe.close()
except IOError:
return False
_wordBADict['silence'] = ([
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[bitarray('101011000000101010100000010000000000001000000000000000000000010001000000010000000000100000000000100000000000'),
bitarray('001010110000001010101000000100000000000010000000000000000000000100010000000100000000001000000000001000000000')]
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])
return _wordBADict
#Read a single ambe file from the audio directory
def readSingleFile(self,filename):
ambeBytearray = {}
_wordBitarray = bitarray(endian='big')
_wordBA= []
try:
with open(self.path+filename,'rb') as ambe:
_wordBitarray.frombytes(ambe.read())
#108
_wordBA = []
pairs = 1
_lastburst = ''
for _burst in self._make_bursts(_wordBitarray):
#Not sure if we need to pad or not? Seems to make little difference.
if len(_burst) < 108:
pad = (108 - len(_burst))
for i in range(0,pad,1):
_burst.append(False)
if pairs == 2:
_wordBA.append([_lastburst,_burst])
_lastburst = ''
pairs = 1
next
else:
pairs = pairs + 1
_lastburst = _burst
_wordBitarray.clear()
ambe.close()
except IOError:
return(False)
return(_wordBA)
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if __name__ == '__main__':
test = readAMBE('en_GB','./Audio/')
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print(test.readfiles())
print(test.readSingleFile('44xx.ambe'))