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rxseger / rx_tools

rx_fm, rx_power, and rx_sdr tools for receiving data from SDRs, based on rtl_fm, rtl_power, and rtl_sdr from librtlsdr, but using the SoapySDR vendor-neutral SDR support library instead, intended to support a wider range of devices than RTL-SDR
GNU General Public License v2.0
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rx_fm fails with local rtlsdr device whereas rtl_fm works using the same command line arguments #90

Open RDPowerz opened 3 years ago

RDPowerz commented 3 years ago

Am now finding that I found a way to get rtl_fm (but not rx_fm) to decode the local classical fm station (using rtl-sdr dongle of course). Still can't get rx_fm (i.e. soapy version) to work. They are using the same code to parse the command lines, so I can change 'rtl_fm' to 'rx_fm' and it should just work, but it does not. It is my understanding that they are supposed to be command line compatible.

Works: rtl_fm -M wbfm -f 99.5M | play -r 32k -t raw -e s -b 16 -c 1 -V1 -

Doesn't work; rx_fm -M wbfm -f 99.5M | play -r 32k -t raw -e s -b 16 -c 1 -V1 -

Others should be able to try these two cases just by changing the -f argument to tune to a strong local station.

Version info:

rx_tools$ git log | head -n1 commit 811b21c4c8a592515279bd19f7460c6e4ff0551c

Soapy info:

rx_tools$ SoapySDRUtil --info ######################################################

Soapy SDR -- the SDR abstraction library

######################################################

Lib Version: v0.8.0-g926c86d9 API Version: v0.8.0 ABI Version: v0.8 Install root: /usr/local Search path: /usr/local/lib/SoapySDR/modules0.8 Module found: /usr/local/lib/SoapySDR/modules0.8/libHackRFSupport.so (0.3.3-7d53087) Module found: /usr/local/lib/SoapySDR/modules0.8/libairspyhfSupport.so (0.1.1-b6cfbf5) Module found: /usr/local/lib/SoapySDR/modules0.8/libaudioSupport.so (0.1.1-9aa2b5c) Module found: /usr/local/lib/SoapySDR/modules0.8/libremoteSupport.so (0.6.0-c09b2f1) Module found: /usr/local/lib/SoapySDR/modules0.8/librtlsdrSupport.so (0.3.1-24b27fa) Available factories... airspyhf, audio, hackrf, remote, rtlsdr Available converters...

Working use case: rx_tools$ rtl_fm -M wbfm -f 99.5M | play -r 32k -t raw -e s -b 16 -c 1 -V1 - Found 1 device(s): 0: Realtek, RTL2838UHIDIR, SN: 00000001

Using device 0: Generic RTL2832U OEM

-: (raw)

File Size: 0
Encoding: Signed PCM
Channels: 1 @ 16-bit
Samplerate: 32000Hz
Replaygain: off
Duration: unknown

In:0.00% 00:00:00.00 [00:00:00.00] Out:0 [ | ] Clip:0 Found Rafael Micro R820T tuner Tuner gain set to automatic. Tuned to 99771000 Hz. Oversampling input by: 6x. Oversampling output by: 1x. Buffer size: 8.03ms Exact sample rate is: 1020000.026345 Hz Sampling at 1020000 S/s. Output at 170000 Hz. In:0.00% 00:00:02.30 [00:00:00.00] Out:65.5k [ -===|===- ] Hd:5.6 Clip:0

Failing use case:

rxtools$ rx_fm -M wbfm -f 99.5M | play -r 32k -t raw -e s -b 16 -c 1 -V1 -

-: (raw)

File Size: 0
Encoding: Signed PCM
Channels: 1 @ 16-bit
Samplerate: 32000Hz
Replaygain: off
Duration: unknown

In:0.00% 00:00:00.00 [00:00:00.00] Out:0 [ | ] Clip:0
RtApiAlsa::getDeviceInfo: snd_pcm_open error for device (hw:0,0), Device or resource busy.

RtApiAlsa::getDeviceInfo: snd_pcm_open error for device (hw:0,0), Device or resource busy.

Found Rafael Micro R820T tuner Using device Audio: device_id=13 origin=https://github.com/pothosware/SoapyAudio Found 1 channel(s) : Channel 0 : Found 1 antenna(s): RX Found 0 gain(s): Found 1 frequencies: RF Found 14 sample rates: 4000 5512 8000 9600 11025 16000 22050 32000 44100 48000 88200 96000 176400 192000 Found 0 bandwidths: [INFO] Using format CS16. Bandwidth set to automatic resulted in 0 Hz. Tuned to 99771000 Hz. Oversampling input by: 6x. Oversampling output by: 1x. Buffer size: 8.03ms Sampling at 1020000 S/s. Output at 170000 Hz.

RtApiAlsa::getDeviceInfo: snd_pcm_open error for device (hw:0,0), Device or resource busy.

RtApiAlsa::getDeviceInfo: snd_pcm_open error for device (hw:0,0), Device or resource busy.

RtApiAlsa: dump hardware params just after device open:

ACCESS: RW_INTERLEAVED FORMAT: U8 S16_LE S16_BE S24_LE S24_BE S32_LE S32_BE FLOAT_LE FLOAT_BE MU_LAW A_LAW S24_3LE S24_3BE SUBFORMAT: STD SAMPLE_BITS: [8 32] FRAME_BITS: [8 1024] CHANNELS: [1 32] RATE: [1 192000] PERIOD_TIME: (5 4294967295) PERIOD_SIZE: [1 1398102) PERIOD_BYTES: [128 1398102) PERIODS: [3 1024] BUFFER_TIME: (15 4294967295] BUFFER_SIZE: [3 4194304] BUFFER_BYTES: [384 4194304] TICK_TIME: ALL

RtApiAlsa: dump hardware params after installation:

ACCESS: RW_INTERLEAVED FORMAT: FLOAT_LE SUBFORMAT: STD SAMPLE_BITS: 32 FRAME_BITS: 32 CHANNELS: 1 RATE: 192000 PERIOD_TIME: (10666 10667) PERIOD_SIZE: 2048 PERIOD_BYTES: 8192 PERIODS: 4 BUFFER_TIME: (42666 42667) BUFFER_SIZE: 8192 BUFFER_BYTES: 32768 TICK_TIME: [0 0]

RtApiAlsa: dump software params after installation:

tstamp_mode: NONE tstamp_type: GETTIMEOFDAY period_step: 1 avail_min: 2048 start_threshold: 2048 stop_threshold: -1 silence_threshold: 0 silence_size: 4611686018427387904 boundary: 4611686018427387904 In:0.00% 00:00:01.02 [00:00:00.00] Out:24.6k [ -====|====- ] Clip:0

rrobinett commented 3 years ago

Your two lines work perfectly and identically on my 4GB Raspberry Pi 4 running buster ;=(

RDPowerz commented 3 years ago

Interesting!   Can you provide some more info, such as output of 'SoapySDRUtil --info' and 'SoapySdrUtil --find' on your RPi?

This will tell me what software and hardware you are using.

Regards,RDP On Sunday, January 3, 2021, 10:46:39 AM EST, rrobinett notifications@github.com wrote:

Your two lines work perfectly and identically on my 4GB Raspberry Pi 4 running buster ;=(

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or unsubscribe.

rrobinett commented 3 years ago

The information you requested is attached below. I have also just learned that usb mode (Upper Sideband) requires a source code fix to remove from rx_sdr a divide by 256. Perhaps that change would help FM modes too.

+++++++++++++++++++++++

pi@Wsprdaemon-Pi:~ $ SoapySDRUtil --info ######################################################

Soapy SDR -- the SDR abstraction library

######################################################

Lib Version: v0.8.0-g926c86d9 API Version: v0.8.0 ABI Version: v0.8 Install root: /usr/local Search path: /usr/local/lib/SoapySDR/modules0.8 Module found: /usr/local/lib/SoapySDR/modules0.8/librtlsdrSupport.so (0.3.1-24b27fa) Available factories... rtlsdr Available converters...

pi@Wsprdaemon-Pi:~ $ SoapySDRUtil --find ######################################################

Soapy SDR -- the SDR abstraction library

######################################################

Detached kernel driver Found Rafael Micro R820T tuner Reattached kernel driver Found device 0 driver = rtlsdr label = Generic RTL2832U OEM :: 00000001 manufacturer = Realtek product = RTL2838UHIDIR serial = 00000001 tuner = Rafael Micro R820T

pi@Wsprdaemon-Pi:~ $

RDPowerz commented 3 years ago

Very interesting!

You have the same soapy library and soapy rtl driver versions I am using.

Also it seems rx_tools have not changed in a while so it seems safe to say we have the same version of these.

I am using Ubuntu 18.04 in x86_64 build mode.

rx_fm is not producing a version number so I went to my build directory for rx_tools and did:

rx_tools$ git log | head -n1 commit 811b21c

That commit maps to March 2019 so it seems we would have the same rx_tools as well.

I'm at a loss to explain the difference.

I plan to build a rpi based system soon, that should give me another data point.

Regards, RDP