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audioqueue.pyx
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audioqueue.pyx
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import numpy
import threading
import sys
cimport numpy as np
cdef extern from "numpy/arrayobject.h":
void *PyArray_DATA(np.ndarray arr)
class Queue_Empty(Exception):
pass
class Queue_Full(Exception):
pass
cdef class AudioQueue:
"""
This class is responsible for gathering sound sample together
and if necessary, for reemitting new audio-packet of a specified size
"""
cdef int limitsz
cdef object l
cdef unsigned long long _off # global time offset
cdef unsigned long long _totallen # len of buffer
cdef long long _newframepos # new frame starts at...
cdef int _destframesize
cdef int _destframeinterval
cdef int _destframeoverlap
cdef object _destframequeue
cdef float tps
cdef float samplerate
cdef float speedrate[2]
cdef object mutex
def __init__(self,limitsz=-1,samplerate=44100,tps=1000,destframesize=0, destframeoverlap=0,destframequeue=None):
self.limitsz=limitsz
self.l=[]
self._off=0
self._totallen=0
self._newframepos=0
self._destframesize=destframesize
self._destframeoverlap=destframeoverlap
self._destframeinterval=destframesize-destframeoverlap
#print destframesize,destframeoverlap
assert((self._destframeinterval>0) or destframesize==0)
self._destframequeue=destframequeue
self.tps=tps
self.samplerate=samplerate
self.speedrate[0]=tps/samplerate
self.speedrate[1]=1./samplerate # how much seconds does elapse per sample
self.mutex=threading.Lock()
def __len__(self):
""" return the current amount of audio in the queue"""
return self._totallen
def get_len(self):
""" return the max amount of audio in the queue """
return self.limitsz
def get(self,wait=True):
if (self.mutex.acquire(wait)):
try:
r= self.l.pop(0)
self._totallen-=r[0].shape[0]
self._newframepos-=r[0].shape[0]
self._off+=r[0].shape[0]
if (self._newframepos<0):
self._newframepos=0
if (self._totallen<0):
self._totallen=0
assert(self._newframepos>=0)
assert(self._newframepos<=self._totallen)
self.mutex.release()
return r;
except:
self.mutex.release()
raise Queue_Empty
else:
raise Queue_Empty
def _timeat(self,x,t=0):
i=0
lli=self.l[i][0].shape[0]
while (x>lli):
x-=lli
i+=1
lli=self.l[i][0].shape[0]
#print "erroneous speedrate to correct"
return self.l[i][1+t]+x*self.speedrate[t]
def _check_push_frame(self,writesz):
# we are already mutex protected here
#print "dfsz=", self._destframesize, self._totallen, self._newframepos
if (self._destframesize):
#newframes=((self._totallen-self._newframepos)//(self._destframeinterval))-((self._totallen-(writesz+self._newframepos))//(self._destframeinterval))
#newframes-=(self._destframeoverlap/self._destframeinterval)
#print "# NEWFRAMES, TL, NFP",newframes, self._totallen, self._newframepos
while ((self._totallen-self._newframepos) > self._destframesize):
# we can add frames
#print "# TL, NFP,INT", self._totallen, self._newframepos,self._destframeinterval
#print ((self._totallen+writesz-self._newframepos) , self._destframesize)
#print self._destframequeue.get_len()
#raise Exception,"Will lockx"
#sys.stderr.write( "PUSHING...\n")
#sys.stderr.write(str(self))
#sys.stderr.write(str(self._destframequeue))
# sys.stderr.write(str(self.mutex))
# sys.stderr.write(str(self._destframequeue.mutex))
self._destframequeue.putforce((self.__getslice(self._newframepos,(self._newframepos+self._destframesize)),self._timeat(self._newframepos),self._timeat(self._newframepos,t=1) ))
#print "# TL, NFP", self._totallen, self._newframepos
self._newframepos+=self._destframeinterval
#print "# TL, NFP", self._totallen, self._newframepos
#sys.stderr.write(str((self._newframepos, self._totallen)))
assert(self._newframepos>=0)
assert(self._newframepos<=self._totallen)
def put(self,it,wait=True):
if (self.mutex.acquire(wait)):
if ((self.limitsz!=-1) and (len(self.l)>=self.limitsz)):
self.mutex.release()
raise Queue_Full
self.l.append(it)
self._totallen+=it[0].shape[0]
self._check_push_frame(it[0].shape[0])
self.mutex.release()
else:
raise Queue_Full
def putforce(self,it,wait=True):
#print self._newframepos, self.l, self.limitsz
if (self.mutex.acquire(wait)):
#print (self.limitsz==-1) or ((self.limitsz!=-1) and (len(self.l)<=self.limitsz))
if ((self.limitsz!=-1) and (len(self.l)>=self.limitsz)):
#sys.stderr.write("warning : audio queue overloaded\n")
x=self.l.pop(0)
#print "$", self._totallen, self._newframepos
self._totallen-=x[0].shape[0]
self._newframepos-=x[0].shape[0]
self._off+=x[0].shape[0]
#print "$", self._totallen, self._newframepos
if (self._newframepos<0):
self._newframepos=0
if (self._totallen<0):
self._totallen=0
assert(self._newframepos>=0)
assert(self._newframepos<=self._totallen)
self.l.append(it)
self._totallen+=it[0].shape[0]
self._check_push_frame(it[0].shape[0])
self.mutex.release()
def get_nowait(self):
return self.get(wait=False)
def put_nowait(self,it):
return self.put(it,wait=False)
def putforce_nowait(self,it):
return self.putforce(it,wait=False)
def __getitem__(self,x):
# 0 is the fist element in the non popped array so we start from last buf
assert(x>=0)
self.mutex.acquire()
if (x>=self._totallen):
self.mutex.release()
assert(x<self._totallen)
assert(False)
i=0#i=-1
try:
lli=self.l[i][0].shape[0]
except:
self.mutex.release()
raise IndexError
while (x>lli):
x-=lli
i+=1#i-=1
try:
lli=self.l[i][0].shape[0]
except:
self.mutex.release()
raise IndexError
r=self.l[i][0][x]
self.mutex.release()
return r
def __getslice__(self,x,y):
# 0 is the fist element in the non popped array so we start from last buf
assert(y>=x)
assert(x>=0)
self.mutex.acquire()
if (y>self._totallen):
self.mutex.release()
assert(y<=self._totallen)
assert(False)
if (y==x):
self.mutex.release()
return []
i=0#i=-1
try:
lli=self.l[i][0].shape[0]
except:
self.mutex.release()
raise IndexError
while (x>=lli):
x-=lli
y-=lli
#i-=1
i+=1
try:
lli=self.l[i][0].shape[0]
except:
self.mutex.release()
raise IndexError
j=i
llj=lli
while (y>llj):
y-=llj
#j-=1
j+=1
try:
llj=self.l[j][0].shape[0]
except:
self.mutex.release()
raise IndexError
if (i==j):
try:
r=self.l[i][0][x:y]
except:
self.mutex.release()
raise IndexError
self.mutex.release()
return r
else:
#range (i-1,j,-1)
try:
r=numpy.vstack( [ self.l[i][0][x:,:] ] + [ self.l[k][0] for k in range (i+1,j) ] + [ self.l[j][0][:y,:] ])
except:
self.mutex.release()
raise IndexError
self.mutex.release()
return r
def __getitem(self,x):
# 0 is the fist element in the non popped array so we start from last buf
i=0#i=-1
lli=self.l[i][0].shape[0]
while (x>lli):
x-=lli
i+=1#i-=1
lli=self.l[i][0].shape[0]
r=self.l[i][x]
return r
def __getslice(self,x,y):
# 0 is the fist element in the non popped array so we start from last buf
if (y==x):
return []
i=0#i=-1
lli=self.l[i][0].shape[0]
while (x>=lli):
x-=lli
y-=lli
#i-=1
i+=1
lli=self.l[i][0].shape[0]
j=i
llj=lli
while (y>llj):
y-=llj
#j-=1
j+=1
if (j==len(self.l)):
j=j-1
y=self.l[j][0].shape[0]
llj=self.l[j][0].shape[0]
if (i==j):
r=self.l[i][0][x:y]
return r
else:
#range (i-1,j,-1)
r=numpy.vstack( [ self.l[i][0][x:,:] ] + [ self.l[k][0] for k in range (i+1,j) ] + [ self.l[j][0][:y,:] ])
return r
def get_time_bounds(self,wait=True):
if (self.mutex.acquire(wait)):
ttimefrom=self.l[0][2] ## mintime
ttimeto=self.l[-1][2]+(self.l[-1][0].shape[0]*self.speedrate[1]) ## maxtime
self.mutex.release()
return ttimefrom,ttimeto
def get_time_slice(self,timefrom,timeto,wait=True):
## we assume this timeslice is in our queue
""" get the slice of audio buffers contained in-between the two specified instants,
these instants must be specified in seconds since the audio started
(this function suffers from a little bit from approximations (apparently))
"""
assert(timefrom<=timeto)
if (self.mutex.acquire(wait)):
ttimefrom=self.l[0][2] ## mintime
ttimeto=self.l[-1][2]+(self.l[-1][0].shape[0]*self.speedrate[1]) ## maxtime
if (ttimeto<ttimefrom):
print("warning ttimeto < ttimefrom : insonsistent audio queue think to reset audio queues when seeking")
if (timefrom<ttimefrom):
print("warning time from slice is before audioqueue memory capacity : fixing !")
timefrom=ttimefrom
if (timeto<ttimefrom):
print("warning timeto slice is before audioqueue memory capacity : fixing !")
timeto=ttimefrom
if (timeto>ttimeto):
print("warning timeto slice is after audioqueue memory capacity : fixing !")
timeto=ttimeto
if (timefrom>ttimeto):
print("warning timefrom slice is after audioqueue memory capacity : fixing !")
timefrom=ttimeto
deltafrom=int((timefrom-ttimefrom)*self.samplerate)
deltato=int((timeto-ttimefrom)*self.samplerate)
try:
sl=self.__getslice(deltafrom,deltato)
except:
self.mutex.release()
raise Exception,("error retrieving slice %d:%d"%(deltafrom,deltato))
# print (self._off+deltafrom,self._off+deltato)
self.mutex.release()
return sl
def get_sampletime_bounds(self,wait=True):
if (self.mutex.acquire(wait)):
ttimefrom=self._off ## mintime
ttimeto=self._off+self._totallen ## maxtime
self.mutex.release()
return ttimefrom,ttimeto
def get_sampletime_slice(self,timefrom,timeto,wait=True):
## we assume this timeslice is in our queue
""" get the slice of audio buffers contained in-between the two specified instants,
these instants must be specified in seconds since the audio started """
assert(timefrom<=timeto)
if (self.mutex.acquire(wait)):
ttimefrom=self._off ## mintime
ttimeto=self._off+self._totallen ## maxtime
if (ttimeto<ttimefrom):
print("warning ttimeto < ttimefrom : insonsistent audio queue think to reset audio queues when seeking")
if (timefrom<ttimefrom):
print("warning time from slice is before audioqueue memory capacity : fixing !")
timefrom=ttimefrom
if (timeto<ttimefrom):
print("warning timeto slice is before audioqueue memory capacity : fixing !")
timeto=ttimefrom
if (timeto>ttimeto):
print("warning timeto slice is after audioqueue memory capacity : fixing !")
timeto=ttimeto
if (timefrom>ttimeto):
print("warning timefrom slice is after audioqueue memory capacity : fixing !")
timefrom=ttimeto
deltafrom=(timefrom-ttimefrom)
deltato=(timeto-ttimefrom)
try:
sl=self.__getslice(deltafrom,deltato)
except:
self.mutex.release()
raise Exception,("error retrieving slice %d:%d"%(deltafrom,deltato))
# print (self._off+deltafrom,self._off+deltato)
self.mutex.release()
return sl
def print_buffer_stats(self,prefix=""):
sys.stderr.write( prefix+" limitsz"+ str(self.limitsz)+"\n")
sys.stderr.write( prefix+" offset (mintime)"+str( self._off)+"\n")
sys.stderr.write( prefix+" offset (maxtime)"+str( self._off+ self._totallen)+"\n")
sys.stderr.write( prefix+" length"+str( self._totallen)+"\n")
sys.stderr.write( prefix+" time bounds : "+str( self.get_time_bounds())+"\n")
sys.stderr.write( prefix+" sampletime bounds : "+str( self.get_sampletime_bounds())+"\n")