A Python 3 script for capturing and recording a SDR stream to a WAV file (or serving it to a HTTP audio stream).

Related tags

Audiorfsoapyfile
Overview

rfsoapyfile

A Python 3 script for capturing and recording a SDR stream to a WAV file (or serving it to a HTTP audio stream). The script is threaded for high performance, especially on a Raspberry Pi. The script includes a REST API for controlling the capture and WAV recording remotely.

The script will save the stream in either RF64 or WAV file format. By default the recording uses the WAV format. The SDR specific 'auxi' metadata chunk is added to the file as well.

Dependencies

The script requires the numpy and SoapySDR Python libraries.

Example

$ python soapyfile.py -f 100.1e6 -r 1e6 --pcm16 -g 42 --output out --pause

Usage

$ soapyfile.py --help
usage: soapyfile.py [-h] [-l] [-d DEVICE] [-f FREQUENCY] [-r RATE] [-g GAIN]
                    [-a] [--iq-swap] [--biastee] [--digital-agc]
                    [--offset-tune] [--direct-samp DIRECT_SAMP] [--pcm16]
                    [--rf64] [--notimestamp] [--pause] [--output OUTPUT]
                    [--packet-size PACKET_SIZE] [--buffer-size BUFFER_SIZE]
                    [--hostname HOSTNAME] [--port PORT] [--refresh REFRESH]
                    [--quiet]

optional arguments:
  -h, --help            show this help message and exit
  -l, --list            list devices (default: False)
  -d DEVICE, --device DEVICE
                        device name (default: None)
  -f FREQUENCY, --frequency FREQUENCY
                        center frequency (Hz) (default: None)
  -r RATE, --rate RATE  sampling rate (Hz) (default: None)
  -g GAIN, --gain GAIN  front end gain (dB) (default: None)
  -a, --agc             enable AGC (default: False)
  --iq-swap             swap IQ signals (default: False)
  --biastee             enable bias tee (default: False)
  --digital-agc         enable digital AGC (default: False)
  --offset-tune         enable offset tune (default: False)
  --direct-samp DIRECT_SAMP
                        select I or Q channel: 1 or 2 (default: None)
  --pcm16               write 16-bit PCM samples (default: False)
  --rf64                write RF64 file (default: False)
  --notimestamp         do not add timestamp to filename (default: False)
  --pause               pause recording (default: False)
  --output OUTPUT       output file name (default: output)
  --packet-size PACKET_SIZE
                        packet size (default: 1024)
  --buffer-size BUFFER_SIZE
                        buffer size in MB (default: 256)
  --hostname HOSTNAME   REST server hostname (default: 0.0.0.0)
  --port PORT           REST server port number (default: 8080)
  --refresh REFRESH     peak meter refresh (sec) (default: 2)
  --quiet               do not print peak values (default: False)

REST API

The REST API is available off port 8080. Use POST or PUT to change a program or radio setting. Use GET to view it. If a boolean is needed, the following strings are accepted: y, n, yes, no, true, and false.

PUT /quit              
   
          stop recording and terminate program, yes or no
PUT /rate              
    
          set sampling rate (Hz) but only if recording is paused
PUT /frequency         
     
           set center frequency (Hz)
PUT /gain              
      
            set gain (dB)
PUT /agc               
       
         enable agc, yes or no PUT /pause 
        
          pause recording, yes or no PUT /setting/
          
          
            change named soapy setting GET /rate return sampling rate (Hz) GET /frequency return center frequency (Hz) GET /gain return gain (Hz) GET /agc return AGC setting (yes or no) GET /pause return whether the recording is paused (yes or no) GET /setting return list of available soapy setting names GET /setting/
           
             return value of named soapy setting GET /s16 return 16-bit integer PCM WAV HTTP audio stream GET /f32 return 32-bit floating point PCM WAV HTTP audio stream 
           
          
         
        
       
      
     
    
   
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