#!/usr/bin/env python # # Copyright 2005-2007,2011 Free Software Foundation, Inc. # # This file is part of GNU Radio # # GNU Radio is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 3, or (at your option) # any later version. # # GNU Radio is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with GNU Radio; see the file COPYING. If not, write to # the Free Software Foundation, Inc., 51 Franklin Street, # Boston, MA 02110-1301, USA. # """ Reads from a file and generates PAL TV pictures in black and white which can be displayed using ImageMagick or realtime using gr-video-sdl (To capture the input file Use usrp_rx_file.py, or use usrp_rx_cfile.py --output-shorts if you have a recent enough usrp_rx_cfile.py) Can also use usrp directly as capture source, but then you need a higher decimation factor (64) and thus get a lower horizontal resulution. There is no synchronisation yet. The sync blocks are in development but not yet in cvs. """ from gnuradio import gr, eng_notation from gnuradio import audio from gnuradio import uhd from gnuradio.eng_option import eng_option from optparse import OptionParser import sys try: from gnuradio import video_sdl except: print "FYI: gr-video-sdl is not installed" print "realtime \"sdl\" video output window will not be available" class my_top_block(gr.top_block): def __init__(self): gr.top_block.__init__(self) usage=("%prog: [options] output_filename.\nSpecial output_filename" + \ "\"sdl\" will use video_sink_sdl as realtime output window. " + \ "You then need to have gr-video-sdl installed.\n" +\ "Make sure your input capture file containes interleaved " + \ "shorts not complex floats") parser = OptionParser(option_class=eng_option, usage=usage) parser.add_option("-a", "--args", type="string", default="", help="UHD device address args [default=%default]") parser.add_option("", "--spec", type="string", default=None, help="Subdevice of UHD device where appropriate") parser.add_option("-A", "--antenna", type="string", default=None, help="select Rx Antenna where appropriate") parser.add_option("-s", "--samp-rate", type="eng_float", default=1e6, help="set sample rate") parser.add_option("-c", "--contrast", type="eng_float", default=1.0, help="set contrast (default is 1.0)") parser.add_option("-b", "--brightness", type="eng_float", default=0.0, help="set brightness (default is 0)") parser.add_option("-i", "--in-filename", type="string", default=None, help="Use input file as source. samples must be " + \ "interleaved shorts \n Use usrp_rx_file.py or " + \ "usrp_rx_cfile.py --output-shorts.\n Special " + \ "name \"usrp\" results in realtime capturing " + \ "and processing using usrp.\n" + \ "You then probably need a decimation factor of 64 or higher.") parser.add_option("-f", "--freq", type="eng_float", default=519.25e6, help="set frequency to FREQ.\nNote that the frequency of the video carrier is not at the middle of the TV channel", metavar="FREQ") parser.add_option("-g", "--gain", type="eng_float", default=None, help="set gain in dB (default is midpoint)") parser.add_option("-p", "--pal", action="store_true", default=False, help="PAL video format (this is the default)") parser.add_option("-n", "--ntsc", action="store_true", default=False, help="NTSC video format") parser.add_option("-r", "--repeat", action="store_false", default=True, help="repeat in_file in a loop") parser.add_option("-N", "--nframes", type="eng_float", default=None, help="number of frames to collect [default=+inf]") parser.add_option("", "--freq-min", type="eng_float", default=50.25e6, help="Set a minimum frequency [default=%default]") parser.add_option("", "--freq-max", type="eng_float", default=900.25e6, help="Set a maximum frequency [default=%default]") (options, args) = parser.parse_args () if not (len(args) == 1): parser.print_help() sys.stderr.write('You must specify the output. FILENAME or sdl \n'); sys.exit(1) filename = args[0] self.tv_freq_min = options.freq_min self.tv_freq_max = options.freq_max if options.in_filename is None: parser.print_help() sys.stderr.write('You must specify the input -i FILENAME or -i usrp\n'); raise SystemExit, 1 if not (filename=="sdl"): options.repeat=False input_rate = options.samp_rate print "video sample rate %s" % (eng_notation.num_to_str(input_rate)) if not (options.in_filename=="usrp"): # file is data source, capture with usr_rx_csfile.py self.filesource = gr.file_source(gr.sizeof_short, options.in_filename, options.repeat) self.istoc = gr.interleaved_short_to_complex() self.connect(self.filesource,self.istoc) self.src=self.istoc else: if options.freq is None: parser.print_help() sys.stderr.write('You must specify the frequency with -f FREQ\n'); raise SystemExit, 1 # build the graph self.u = uhd.usrp_source(device_addr=options.args, io_type=uhd.io_type.COMPLEX_FLOAT32, num_channels=1) self.u.set_samp_rate(input_rate) dev_rate = self.u.get_samp_rate() self.src=self.u if options.gain is None: # if no gain was specified, use the mid-point in dB g = self.u.get_gain_range() options.gain = float(g.start()+g.stop())/2.0 self.u.set_gain(options.gain) r = self.u.set_center_freq(options.freq) if not r: sys.stderr.write('Failed to set frequency\n') raise SystemExit, 1 # Set the subdevice spec if(options.spec): self.u.set_subdev_spec(options.spec, 0) # Set the antenna if(options.antenna): self.u.set_antenna(options.antenna, 0) self.agc = gr.agc_cc(1e-7,1.0,1.0) #1e-7 self.am_demod = gr.complex_to_mag () self.set_blacklevel = gr.add_const_ff(options.brightness +255.0) self.invert_and_scale = gr.multiply_const_ff (-options.contrast *128.0*255.0/(200.0)) self.f2uc = gr.float_to_uchar() # sdl window as final sink if not (options.pal or options.ntsc): options.pal=True #set default to PAL if options.pal: lines_per_frame=625.0 frames_per_sec=25.0 show_width=768 elif options.ntsc: lines_per_frame=525.0 frames_per_sec=29.97002997 show_width=640 width=int(input_rate/(lines_per_frame*frames_per_sec)) height=int(lines_per_frame) if filename=="sdl": #Here comes the tv screen, you have to build and install #gr-video-sdl for this (subproject of gnuradio, only in cvs #for now) try: video_sink = video_sdl.sink_uc(frames_per_sec, width, height, 0, show_width,height) except: print "gr-video-sdl is not installed" print "realtime \"sdl\" video output window is not available" raise SystemExit, 1 self.dst=video_sink else: print "You can use the imagemagick display tool to show the resulting imagesequence" print "use the following line to show the demodulated TV-signal:" print "display -depth 8 -size " +str(width)+ "x" + str(height) + " gray:" +filename print "(Use the spacebar to advance to next frames)" file_sink=gr.file_sink(gr.sizeof_char, filename) self.dst =file_sink if options.nframes is None: self.connect(self.src, self.agc) else: self.head = gr.head(gr.sizeof_gr_complex, int(options.nframes*width*height)) self.connect(self.src, self.head, self.agc) self.connect (self.agc, self.am_demod, self.invert_and_scale, self.set_blacklevel, self.f2uc, self.dst) if __name__ == '__main__': try: my_top_block().run() except KeyboardInterrupt: pass