gstlal_feature_extractor: expose --psd-fft-length option to finer whitener control

gstlal-burst/bin/gstlal_feature_extractor

@@ -418,7 +418,7 @@ for subset_id, channel_subset in enumerate(data_source_info.channel_subsets, 1):
 			head[channel] = pipeparts.mklatency(pipeline, head[channel], name=utils.latency_name('beforewhitening', 2, channel))
 
 		# whiten auxiliary channel data
-		for rate, thishead in multirate_datasource.mkwhitened_multirate_src(pipeline, head[channel], rates, samp_rate, instrument, channel_name = channel, width=32, nxydump_segment=options.nxydump_segment).items():
+		for rate, thishead in multirate_datasource.mkwhitened_multirate_src(pipeline, head[channel], rates, samp_rate, instrument, channel_name = channel, width=32, nxydump_segment=options.nxydump_segment, psd_fft_length=options.psd_fft_length).items():
 			if options.latency_output:
 				thishead = pipeparts.mklatency(pipeline, thishead, name=utils.latency_name('afterwhitening', 3, channel, rate))
 

gstlal-burst/python/fxtools/feature_extractor.py

@@ -506,6 +506,7 @@ def append_options(parser):
 	parser.add_option_group(group)
 
 	group = optparse.OptionGroup(parser, "Program Behavior")
+	group.add_option("--psd-fft-length", metavar = "seconds", default = 32, type = "int", help = "The length of the FFT used to used to whiten the data (default is 32 s).")
 	group.add_option("--local-frame-caching", action = "store_true", help = "Pre-reads frame data and stores to local filespace.")
 	group.add_option("--disable-web-service", action = "store_true", help = "If set, disables web service that allows monitoring of PSDS of aux channels.")
 	group.add_option("-v", "--verbose", action = "store_true", help = "Be verbose.")