1  #!/bin/bash
 2  : '
 3  Copyright (c) 2014, Andras Retzler <ha7ilm@sdr.hu>
 4  All rights reserved.
 5  
 6  Redistribution and use in source and binary forms, with or without
 7  modification, are permitted provided that the following conditions are met:
 8  
 9  1. Redistributions of source code must retain the above copyright notice, this
10     list of conditions and the following disclaimer. 
11  2. Redistributions in binary form must reproduce the above copyright notice,
12     this list of conditions and the following disclaimer in the documentation
13     and/or other materials provided with the distribution.
14  
15  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
16  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
19  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
20  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
21  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
22  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
24  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25  '
26  
27  USAGE="csdr-fm: a script to listen to FM radio with RTL-SDR and csdr.
28  
29  usage:
30  	csdr-fm frequency_mhz [gain_db]
31  
32  example:
33  	csdr-fm 89.5
34  	csdr-fm 89.5 30
35  
36  "
37  GAIN=30
38  if [ $# -eq 2 ]; then GAIN="$2"; fi
39  if [ $# -eq 0 ]; then echo "$USAGE"; exit -1; fi
40  
41  rtl_sdr -s 2400000 -f `python -c "print int($1*1e6)"` -g $GAIN - | csdr convert_u8_f | csdr fir_decimate_cc 10 0.05 HAMMING | csdr fmdemod_quadri_cf | csdr fractional_decimator_ff 5 | csdr deemphasis_wfm_ff 48000 50e-6 | csdr convert_f_i16 | mplayer -cache 1024 -quiet -rawaudio samplesize=2:channels=1:rate=48000 -demuxer rawaudio -