def getMediaStreams(): audio, video = SDP.media(media='audio'), SDP.media(media='video') audio.fmt = [format(pt=8, name='PCMA', rate=8000)] video.fmt = [format(pt=34, name='H263', rate=90000)] #video.fmt = [format(pt=122, name='H264', rate=90000)] #video.a = ['fmtp:122 profile-level-id=64E00C;max-br=384'] return (audio, video)
def createAnswer(streams, offer, **kwargs):
'''Create an answer SDP for the remote offer SDP using local (streams) list of
media Stream objects.'''
s = SDP()
s.v = '0'
for a in "iep":
if a in kwargs: s[a] = kwargs[a]
s.o = SDP.originator()
s.s = '-'
s.t = offer.t
s.m = []
streams = list(streams) # so that original list is not modified
for your in offer.m: # for each m= line in offer
my, i = None, 0 # answered stream
while i < len(streams):
if streams[i].media == your.media: # match the first stream in streams
my = streams[i].dup() # found, hence
del streams[i] # remove from streams so that we don't match again for another m=
if your.direction == 'recvonly' :
if not my.direction == 'recvonly' :
my.direction = 'sendonly'
else :
my.direction = 'inactive'
if your.direction == 'sendonly' :
if not my.direction == 'sendonly' :
my.direction = 'recvonly'
else :
my.direction = 'inactive'
found = []
for fy in your.fmt: # all offered formats, find the matching pairs
for fm in my.fmt:# the preference order is from offer, hence do for fy, then for fm.
try: fmpt, fypt = int(fm.pt), int(fy.pt) # try using numeric payload type
except: fmpt = fypt = -1
if 0<=fmpt<32 and 0<=fypt<32 and fmpt == fypt \
or fmpt<0 and fypt<0 and fm.pt == fy.pt \
or str(fm.name).lower() == str(fy.name).lower() and fm.rate == fy.rate and fm.count == fy.count: # we don't match the params
found.append((fy, fm)); break
if found: # we found some matching formats, put them in
my.fmt = map(lambda x: x[0], found) # use remote's fy including fy.pt
else:
my.fmt = [format(pt=0)] # no match in formats, but matched media, must put a format with payload type 0
my.port = 0 # and reset the port.
break
else:
i = i + 1
if not my: # did not match the stream, must put a stream with port = 0
my = SDP.media(str(your))
my.port = 0
s.m.append(my) # append it to our media
valid = False
for my in s.m: # check if any valid matching stream is present with valid port
if my.port != 0:
valid = True
break
return valid and s or None # if no valid matching stream found, return None
def createAnswer(streams, offer, **kwargs):
'''Create an answer SDP for the remote offer SDP using local (streams) list of
media Stream objects.'''
s = SDP()
s.v = '0'
for a in "iep":
if a in kwargs: s[a] = kwargs[a]
s.o = SDP.originator()
s.s = '-'
s.t = offer.t
s.m = []
streams = list(streams) # so that original stream is not modified
for your in offer.m: # for each m= line in offer
my, i = None, 0 # answered stream
while i < len(streams):
if streams[
i].media == your.media: # match the first stream in streams
my = streams[i].dup() # found, hence
del streams[
i] # remove from streams so that we don't match again for another m=
found = []
for fy in your.fmt: # all offered formats, find the matching pairs
for fm in my.fmt: # the preference order is from offer, hence do for fy, then for fm.
try:
fmpt, fypt = int(fm.pt), int(
fy.pt) # try using numeric payload type
except:
fmpt = fypt = -1
if 0<=fmpt<32 and 0<=fypt<32 and fmpt == fypt \
or fmpt<0 and fypt<0 and fm.pt == fy.pt \
or str(fm.name).lower() == str(fy.name).lower() and fm.rate == fy.rate and fm.count == fy.count: # we don't match the params
found.append((fy, fm))
break
if found: # we found some matching formats, put them in
my.fmt = map(lambda x: x[0],
found) # use remote's fy including fy.pt
else:
my.fmt = [
format(pt=0)
] # no match in formats, but matched media, must put a format with payload type 0
my.port = 0 # and reset the port.
break
else:
i = i + 1
if not my: # did not match the stream, must put a stream with port = 0
my = SDP.media(str(your))
my.port = 0
s.m.append(my) # append it to our media
valid = False
for my in s.m: # check if any valid matching stream is present with valid port
if my.port != 0:
valid = True
break
return valid and s or None # if no valid matching stream found, return None
