Issue building on x86_64 about rtlsdr-airband HOT 11 CLOSED

fftw 3.2, I suppose?

Please upgrade to 3.3.x.

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That fixed it :-)

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I'm trying to build v3.0.1 on Centos 6.8 but I'm having a similar issue:

$ make PLATFORM=x86 NFM=1 PULSE=1
g++ -O3 -g -Wall -DSYSCONFDIR="/usr/etc" -DDEBUG=0 -march=native -DNFM -DPULSE -DWITH_RTLSDR -c -o rtl_airband.o rtl_airband.cpp
rtl_airband.cpp: In function ‘void demodulate()’:
rtl_airband.cpp:270: error: ‘fftwf_alloc_complex’ was not declared in this scope
rtl_airband.cpp: In function ‘int main(int, char**)’:
rtl_airband.cpp:624: error: #pragma GCC diagnostic not allowed inside functions
rtl_airband.cpp:625: warning: deprecated conversion from string constant to ‘char*’
rtl_airband.cpp:626: warning: deprecated conversion from string constant to ‘char*’
rtl_airband.cpp:627: error: #pragma GCC diagnostic not allowed inside functions
make: *** [rtl_airband.o] Error 1

Is fftw 3.3.x really mandatory? I ask because the EPEL repo for Centos6 has FFTW v3.2.1

--David

from rtlsdr-airband.

You may replace the two fftwf_allow_complex calls in rtl_airband.cpp:

fftin = fftwf_alloc_complex(fft_size);
fftout = fftwf_alloc_complex(fft_size);

with:

fftin = (fftwf_complex *)fftwf_malloc(fft_size * sizeof(fftwf_complex));
fftout = (fftwf_complex *)fftwf_malloc(fft_size * sizeof(fftwf_complex));

You also have to comment out the two:

#pragma GCC diagnostic ignored "-Wwrite-strings"

lines in main().

from rtlsdr-airband.

Hello Tomasz,

Thanks for replying. I gave your changes a try (below) but it didn't resolve all the issues:

/usr/src/redhat/BUILD/RTLSDR-Airband-3.0.1$ diff -u rtl_airband.cpp.orig rtl_airband.cpp
--- rtl_airband.cpp.orig 2018-05-31 07:44:47.863420632 -0700
+++ rtl_airband.cpp 2018-05-31 07:47:54.905799720 -0700
@@ -267,8 +267,12 @@
fftwf_plan fft;
fftwf_complex* fftin;
fftwf_complex* fftout;

• fftin = (fftwf_complex *)fftwf_alloc_complex(fft_size * sizeof(fftwf_complex));
• fftout = (fftwf_complex *)fftwf_alloc_complex(fft_size * sizeof(fftwf_complex));
• /*Change out for FFTW < v3.2
  fftin = fftwf_alloc_complex(fft_size);
  fftout = fftwf_alloc_complex(fft_size);
• */
  fft = fftwf_plan_dft_1d(fft_size, fftin, fftout, FFTW_FORWARD, FFTW_MEASURE);
  #else
  int mb = mbox_open();
  @@ -621,10 +625,10 @@
  }

int main(int argc, char* argv[]) {
-#pragma GCC diagnostic ignored "-Wwrite-strings"
+//#pragma GCC diagnostic ignored "-Wwrite-strings"
char *cfgfile = CFGFILE;
char *pidfile = PIDFILE;
-#pragma GCC diagnostic warning "-Wwrite-strings"
+//#pragma GCC diagnostic warning "-Wwrite-strings"
int opt;
char optstring[16] = "efFhvc:";

Now I see:

$ make PLATFORM=x86 NFM=1 PULSE=1
g++ -O3 -g -Wall -DSYSCONFDIR="/usr/etc" -DDEBUG=0 -march=native -DNFM -DPULSE -DWITH_RTLSDR -c -o rtl_airband.o rtl_airband.cpp
rtl_airband.cpp: In function ‘void demodulate()’:
rtl_airband.cpp:270: error: ‘fftwf_alloc_complex’ was not declared in this scope
rtl_airband.cpp: In function ‘int main(int, char**)’:
rtl_airband.cpp:629: warning: deprecated conversion from string constant to ‘char*’
rtl_airband.cpp:630: warning: deprecated conversion from string constant to ‘char*’
make: *** [rtl_airband.o] Error 1

from rtlsdr-airband.

Sorry, my mistake.

fftin = (fftwf_complex *)fftwf_malloc(fft_size * sizeof(fftwf_complex));
fftout = (fftwf_complex *)fftwf_malloc(fft_size * sizeof(fftwf_complex));

from rtlsdr-airband.

Getting closer... two warnings but still one error:

make PLATFORM=x86 NFM=1 PULSE=1
g++ -O3 -g -Wall -DSYSCONFDIR="/usr/etc" -DDEBUG=0 -march=native -DNFM -DPULSE -DWITH_RTLSDR -c -o rtl_airband.o rtl_airband.cpp
rtl_airband.cpp: In function ‘int main(int, char**)’:
rtl_airband.cpp:629: warning: deprecated conversion from string constant to ‘char*’
rtl_airband.cpp:630: warning: deprecated conversion from string constant to ‘char*’
g++ -O3 -g -Wall -DSYSCONFDIR="/usr/etc" -DDEBUG=0 -march=native -DNFM -DPULSE -DWITH_RTLSDR -c -o input-common.o input-common.cpp
g++ -O3 -g -Wall -DSYSCONFDIR="/usr/etc" -DDEBUG=0 -march=native -DNFM -DPULSE -DWITH_RTLSDR -c -o input-helpers.o input-helpers.cpp
g++ -O3 -g -Wall -DSYSCONFDIR="/usr/etc" -DDEBUG=0 -march=native -DNFM -DPULSE -DWITH_RTLSDR -c -o output.o output.cpp
g++ -O3 -g -Wall -DSYSCONFDIR="/usr/etc" -DDEBUG=0 -march=native -DNFM -DPULSE -DWITH_RTLSDR -c -o config.o config.cpp
config.cpp: In function ‘int parse_outputs(libconfig::Setting&, channel_t*, int, int, bool)’:
config.cpp:121: error: operands to ?: have different types ‘libconfig::Setting’ and ‘const char [12]’
make: *** [config.o] Error 1

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pdata->name = strdup(outs[o].exists("name") ? outs[o]["name"] : "rtl_airband");

This is not 100% correct, but newer versions of gcc can cope with it. It should be:

pdata->name = outs[o].exists("name") ? strdup(outs[o]["name"]) : "rtl_airband";

I'll fix that.

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That worked and all warnings have been resolved! Awesome! Now on to see if I can get eight audio streams to send to ALSA loopback/sinks/whatever to STDOUT instead of using PulseAudio as Raspbian doesn't use PulseAudio due to various issues. Thanks for the help!

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Lucky me that I didn't know about these issues - so I got it running in a couple of minutes.

Anyway, you don't have to run pulseaudio server on the Pi where rtl_airband is running. You can stream to a remote Pulseaudio server running on a PC.

from rtlsdr-airband.

Sent you an email to take this out of the Github issues area unless you'd like me to create a new issue on Github or maybe you have an email list for rtlsdr-airband support questions (groups.io, yahoo groups, whastever).

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