def get_channels(framefile):
"""Return a list of all channels written into the given GWF-format
framefile
@param framefile
`string` path to input frame file
@returns a list of all channels present in the table of contents
Example:
\code
>>> get_channels('H-H1_LDAS_C02_L2-9668/H-H1_LDAS_C02_L2-966802176-128.gwf')
['H1:LSC-DATA_QUALITY_VECTOR', 'H1:IFO-SV_STATE_VECTOR', 'H1:LDAS-STRAIN']
\endcode
"""
frfile = lalframe.FrameUFrFileOpen(framefile, "r")
frtoc = lalframe.FrameUFrTOCRead(frfile)
nadc = lalframe.FrameUFrTOCQueryAdcN(frtoc)
nproc = lalframe.FrameUFrTOCQueryProcN(frtoc)
nsim = lalframe.FrameUFrTOCQuerySimN(frtoc)
adcchannels = [
lalframe.FrameUFrTOCQueryAdcName(frtoc, i) for i in range(nadc)
]
procchannels = [
lalframe.FrameUFrTOCQuerySimName(frtoc, i) for i in range(nsim)
]
simchannels = [
lalframe.FrameUFrTOCQueryProcName(frtoc, i) for i in range(nproc)
]
return sorted(adcchannels + procchannels + simchannels)
def iter_channel_names(framefile):
"""Iterate over the names of channels found in a GWF file
Parameters
----------
framefile : `str`
path of frame file to read
Returns
-------
channels : `generator`
an iterator that will loop over the names of channels as read from
the table of contents of the given GWF file
"""
try:
out = shell.call(['FrChannels', framefile])[0]
except (OSError, shell.CalledProcessError):
import lalframe
# read frame and table of contents
frfile = lalframe.FrameUFrFileOpen(framefile, "r")
frtoc = lalframe.FrameUFrTOCRead(frfile)
for ctype in ['Sim', 'Proc', 'Adc']:
query = getattr(lalframe, 'FrameUFrTOCQuery%sName' % ctype)
i = 0
while True:
try:
yield query(frtoc, i)
except RuntimeError:
break
i += 1
else:
for line in iter(out.splitlines()):
yield line.split(' ', 1)[0]
def iter_channels(framefile):
"""Yield channels from the table-of-contents of the given GWF file
@param framefile
`str` path to input frame file
@return An iterator of channel names
"""
frfile = lalframe.FrameUFrFileOpen(str(framefile), "r")
frtoc = lalframe.FrameUFrTOCRead(frfile)
nsim = lalframe.FrameUFrTOCQuerySimN(frtoc)
for i in range(lalframe.FrameUFrTOCQueryAdcN(frtoc)):
yield lalframe.FrameUFrTOCQueryAdcName(frtoc, i)
for i in range(lalframe.FrameUFrTOCQueryProcN(frtoc)):
yield lalframe.FrameUFrTOCQueryProcName(frtoc, i)
for i in range(lalframe.FrameUFrTOCQuerySimN(frtoc)):
yield lalframe.FrameUFrTOCQuerySimName(frtoc, i)
def get_channel_type(channel, framefile):
"""Find the channel type in a given frame file
Parameters
----------
channel : `str`, `~gwpy.detector.Channel`
name of data channel to find
framefile : `str`
path of GWF file in which to search
Returns
-------
ctype : `str`
the type of the channel ('adc', 'sim', or 'proc')
Raises
------
ValueError
if the channel is not found in the table-of-contents
"""
import lalframe
name = str(channel)
# read frame and table of contents
frfile = lalframe.FrameUFrFileOpen(framefile, "r")
frtoc = lalframe.FrameUFrTOCRead(frfile)
for type_ in ['Sim', 'Proc', 'Adc']:
query = getattr(lalframe, 'FrameUFrTOCQuery%sName' % type_)
i = 0
while True:
try:
chan = query(frtoc, i)
except RuntimeError:
break
else:
if chan == name:
return type_.lower()
i += 1
raise ValueError("%s not found in table-of-contents for %s" %
(name, framefile))