examples: replace rtl_fm tuning with GNU Radio XML-RPC control
The --tune flag now builds an FM receiver from a GRC template, compiles it with grcc, launches it as a subprocess, and tunes via XML-RPC — the same mechanism gr-mcp uses for runtime parameter changes. Includes an interactive freq> prompt for live re-tuning without restarting the flowgraph.
This commit is contained in:
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c793208932
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483
examples/fm_receiver.grc
Normal file
483
examples/fm_receiver.grc
Normal file
@ -0,0 +1,483 @@
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options:
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parameters:
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author: ''
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catch_exceptions: 'True'
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category: '[GRC Hier Blocks]'
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cmake_opt: ''
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comment: ''
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copyright: ''
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description: 'FM receiver template for fm_scanner.py'
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gen_cmake: 'On'
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gen_linking: dynamic
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generate_options: no_gui
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hier_block_src_path: '.:'
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id: fm_receiver
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max_nouts: '0'
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output_language: python
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placement: (0,0)
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qt_qss_theme: ''
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realtime_scheduling: ''
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run: 'True'
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run_command: '{python} -u {filename}'
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run_options: run
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sizing_mode: fixed
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thread_safe_setters: ''
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title: FM Receiver
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window_size: (1000,1000)
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states:
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bus_sink: false
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bus_source: false
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bus_structure: null
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coordinate: [8, 8]
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rotation: 0
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state: enabled
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blocks:
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- name: freq
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id: variable
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parameters:
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comment: ''
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value: 102.0e6
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states:
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bus_sink: false
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bus_source: false
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bus_structure: null
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state: enabled
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- name: samp_rate
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id: variable
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parameters:
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comment: ''
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value: int(2.4e6)
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states:
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bus_sink: false
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bus_source: false
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bus_structure: null
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state: enabled
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- name: analog_wfm_rcv_0
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id: analog_wfm_rcv
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parameters:
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affinity: ''
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alias: ''
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audio_decimation: '10'
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comment: ''
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maxoutbuf: '0'
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minoutbuf: '0'
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quad_rate: 480e3
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states:
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bus_sink: false
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bus_source: false
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bus_structure: null
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state: enabled
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- name: audio_sink_0
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id: audio_sink
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parameters:
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affinity: ''
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alias: ''
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comment: ''
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device_name: ''
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num_inputs: '1'
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ok_to_block: 'True'
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samp_rate: '48000'
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states:
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bus_sink: false
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bus_source: false
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bus_structure: null
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state: enabled
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- name: low_pass_filter_0
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id: low_pass_filter
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parameters:
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affinity: ''
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alias: ''
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beta: '6.76'
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comment: ''
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cutoff_freq: 100e3
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decim: '5'
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gain: '1'
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interp: '1'
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maxoutbuf: '0'
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minoutbuf: '0'
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samp_rate: 2.4e6
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type: fir_filter_ccf
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width: 10e3
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win: window.WIN_HAMMING
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states:
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bus_sink: false
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bus_source: false
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bus_structure: null
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state: enabled
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- name: osmosdr_source_0
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id: osmosdr_source
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parameters:
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affinity: ''
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alias: ''
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ant0: ''
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ant1: ''
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ant10: ''
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ant11: ''
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ant12: ''
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ant13: ''
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ant14: ''
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ant15: ''
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ant16: ''
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ant17: ''
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ant18: ''
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ant19: ''
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ant2: ''
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ant20: ''
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ant21: ''
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ant22: ''
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ant23: ''
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ant24: ''
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ant25: ''
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ant26: ''
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ant27: ''
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ant28: ''
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ant29: ''
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ant3: ''
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ant30: ''
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ant31: ''
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ant4: ''
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ant5: ''
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ant6: ''
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ant7: ''
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ant8: ''
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ant9: ''
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args: '"rtl=0"'
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bb_gain0: '20'
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bb_gain1: '20'
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bb_gain10: '20'
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bb_gain11: '20'
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bb_gain12: '20'
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bb_gain13: '20'
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bb_gain14: '20'
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bb_gain15: '20'
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bb_gain16: '20'
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bb_gain17: '20'
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bb_gain18: '20'
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bb_gain19: '20'
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bb_gain2: '20'
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bb_gain20: '20'
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bb_gain21: '20'
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bb_gain22: '20'
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bb_gain23: '20'
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bb_gain24: '20'
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bb_gain25: '20'
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bb_gain26: '20'
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bb_gain27: '20'
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bb_gain28: '20'
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bb_gain29: '20'
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bb_gain3: '20'
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bb_gain30: '20'
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bb_gain31: '20'
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bb_gain4: '20'
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bb_gain5: '20'
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bb_gain6: '20'
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bb_gain7: '20'
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bb_gain8: '20'
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bb_gain9: '20'
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bw0: '0'
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bw1: '0'
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bw10: '0'
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bw11: '0'
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bw12: '0'
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bw13: '0'
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bw14: '0'
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bw15: '0'
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bw16: '0'
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bw17: '0'
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bw18: '0'
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bw19: '0'
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bw2: '0'
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bw20: '0'
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bw21: '0'
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bw22: '0'
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bw23: '0'
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bw24: '0'
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bw25: '0'
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bw26: '0'
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bw27: '0'
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bw28: '0'
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bw29: '0'
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bw3: '0'
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bw30: '0'
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bw31: '0'
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bw4: '0'
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bw5: '0'
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bw6: '0'
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bw7: '0'
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bw8: '0'
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bw9: '0'
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clock_source0: ''
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clock_source1: ''
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clock_source2: ''
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clock_source3: ''
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clock_source4: ''
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clock_source5: ''
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clock_source6: ''
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clock_source7: ''
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comment: ''
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corr0: '0'
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corr1: '0'
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corr10: '0'
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corr11: '0'
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corr12: '0'
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corr13: '0'
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corr14: '0'
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corr15: '0'
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corr16: '0'
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corr17: '0'
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corr18: '0'
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corr19: '0'
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corr2: '0'
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corr20: '0'
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corr21: '0'
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corr22: '0'
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corr23: '0'
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corr24: '0'
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corr25: '0'
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corr26: '0'
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corr27: '0'
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corr28: '0'
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corr29: '0'
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corr3: '0'
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corr30: '0'
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corr31: '0'
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corr4: '0'
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corr5: '0'
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corr6: '0'
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corr7: '0'
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corr8: '0'
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corr9: '0'
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dc_offset_mode0: '0'
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dc_offset_mode1: '0'
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dc_offset_mode10: '0'
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dc_offset_mode11: '0'
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dc_offset_mode12: '0'
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dc_offset_mode13: '0'
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dc_offset_mode14: '0'
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dc_offset_mode15: '0'
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dc_offset_mode16: '0'
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dc_offset_mode17: '0'
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dc_offset_mode18: '0'
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dc_offset_mode19: '0'
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dc_offset_mode2: '0'
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dc_offset_mode20: '0'
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dc_offset_mode21: '0'
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dc_offset_mode22: '0'
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dc_offset_mode23: '0'
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dc_offset_mode24: '0'
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dc_offset_mode25: '0'
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dc_offset_mode26: '0'
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dc_offset_mode27: '0'
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dc_offset_mode28: '0'
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dc_offset_mode29: '0'
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dc_offset_mode3: '0'
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dc_offset_mode30: '0'
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dc_offset_mode31: '0'
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dc_offset_mode4: '0'
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dc_offset_mode5: '0'
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dc_offset_mode6: '0'
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dc_offset_mode7: '0'
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dc_offset_mode8: '0'
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dc_offset_mode9: '0'
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freq0: freq
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freq1: 100e6
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freq10: 100e6
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freq11: 100e6
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freq12: 100e6
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freq13: 100e6
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freq14: 100e6
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freq15: 100e6
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freq16: 100e6
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freq17: 100e6
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freq18: 100e6
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freq19: 100e6
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freq2: 100e6
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freq20: 100e6
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freq21: 100e6
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freq22: 100e6
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freq23: 100e6
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freq24: 100e6
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freq25: 100e6
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freq26: 100e6
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freq27: 100e6
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freq28: 100e6
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freq29: 100e6
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freq3: 100e6
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freq30: 100e6
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freq31: 100e6
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freq4: 100e6
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freq5: 100e6
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freq6: 100e6
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freq7: 100e6
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freq8: 100e6
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freq9: 100e6
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gain0: '10'
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gain1: '10'
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gain10: '10'
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gain11: '10'
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gain12: '10'
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gain13: '10'
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gain14: '10'
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gain15: '10'
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gain16: '10'
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gain17: '10'
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gain18: '10'
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gain19: '10'
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gain2: '10'
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gain20: '10'
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gain21: '10'
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gain22: '10'
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gain23: '10'
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gain24: '10'
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gain25: '10'
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gain26: '10'
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gain27: '10'
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gain28: '10'
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gain29: '10'
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gain3: '10'
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gain30: '10'
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gain31: '10'
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gain4: '10'
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gain5: '10'
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gain6: '10'
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gain7: '10'
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gain8: '10'
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gain9: '10'
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gain_mode0: 'False'
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gain_mode1: 'False'
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gain_mode10: 'False'
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gain_mode11: 'False'
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gain_mode12: 'False'
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gain_mode13: 'False'
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gain_mode14: 'False'
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gain_mode15: 'False'
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gain_mode16: 'False'
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gain_mode17: 'False'
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gain_mode18: 'False'
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gain_mode19: 'False'
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gain_mode2: 'False'
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gain_mode20: 'False'
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gain_mode21: 'False'
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gain_mode22: 'False'
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gain_mode23: 'False'
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gain_mode24: 'False'
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gain_mode25: 'False'
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gain_mode26: 'False'
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gain_mode27: 'False'
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gain_mode28: 'False'
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gain_mode29: 'False'
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gain_mode3: 'False'
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gain_mode30: 'False'
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gain_mode31: 'False'
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gain_mode4: 'False'
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gain_mode5: 'False'
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gain_mode6: 'False'
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gain_mode7: 'False'
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gain_mode8: 'False'
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gain_mode9: 'False'
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if_gain0: '20'
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if_gain1: '20'
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if_gain10: '20'
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if_gain11: '20'
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if_gain12: '20'
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if_gain13: '20'
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if_gain14: '20'
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if_gain15: '20'
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if_gain16: '20'
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if_gain17: '20'
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if_gain18: '20'
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if_gain19: '20'
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if_gain2: '20'
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if_gain20: '20'
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if_gain21: '20'
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if_gain22: '20'
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if_gain23: '20'
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if_gain24: '20'
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if_gain25: '20'
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if_gain26: '20'
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if_gain27: '20'
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if_gain28: '20'
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if_gain29: '20'
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if_gain3: '20'
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if_gain30: '20'
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if_gain31: '20'
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if_gain4: '20'
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if_gain5: '20'
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if_gain6: '20'
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if_gain7: '20'
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if_gain8: '20'
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if_gain9: '20'
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iq_balance_mode0: '0'
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iq_balance_mode1: '0'
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iq_balance_mode10: '0'
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iq_balance_mode11: '0'
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iq_balance_mode12: '0'
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iq_balance_mode13: '0'
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iq_balance_mode14: '0'
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iq_balance_mode15: '0'
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iq_balance_mode16: '0'
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iq_balance_mode17: '0'
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iq_balance_mode18: '0'
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iq_balance_mode19: '0'
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iq_balance_mode2: '0'
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iq_balance_mode20: '0'
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iq_balance_mode21: '0'
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iq_balance_mode22: '0'
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iq_balance_mode23: '0'
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iq_balance_mode24: '0'
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iq_balance_mode25: '0'
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iq_balance_mode26: '0'
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iq_balance_mode27: '0'
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iq_balance_mode28: '0'
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iq_balance_mode29: '0'
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iq_balance_mode3: '0'
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iq_balance_mode30: '0'
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iq_balance_mode31: '0'
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iq_balance_mode4: '0'
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iq_balance_mode5: '0'
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iq_balance_mode6: '0'
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iq_balance_mode7: '0'
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iq_balance_mode8: '0'
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iq_balance_mode9: '0'
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maxoutbuf: '0'
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minoutbuf: '0'
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nchan: '1'
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num_mboards: '1'
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sample_rate: 2.4e6
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sync: sync
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time_source0: ''
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time_source1: ''
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time_source2: ''
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time_source3: ''
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time_source4: ''
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time_source5: ''
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time_source6: ''
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time_source7: ''
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type: fc32
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states:
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bus_sink: false
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bus_source: false
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bus_structure: null
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state: enabled
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- name: xmlrpc_server_0
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id: xmlrpc_server
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parameters:
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addr: 0.0.0.0
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alias: ''
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comment: ''
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port: '8090'
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states:
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bus_sink: false
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bus_source: false
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bus_structure: null
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state: enabled
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connections:
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- [osmosdr_source_0, '0', low_pass_filter_0, '0']
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- [low_pass_filter_0, '0', analog_wfm_rcv_0, '0']
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- [analog_wfm_rcv_0, '0', audio_sink_0, '0']
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metadata:
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file_format: 1
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grc_version: 3.10.12.0
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@ -1,14 +1,23 @@
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#!/usr/bin/env python3
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"""FM Band Scanner — scan 87.5–108.0 MHz using rtl_power, rank stations by signal strength."""
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"""FM Band Scanner — scan 87.5–108.0 MHz using rtl_power, rank stations by signal strength.
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|
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Tuning uses a GNU Radio flowgraph built from the included GRC template,
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compiled with grcc, and controlled at runtime via XML-RPC — the same
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protocol that gr-mcp uses for live parameter control.
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"""
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import argparse
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import csv
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import io
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import json
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import signal
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import re
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import shutil
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import signal
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import subprocess
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import sys
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import tempfile
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import time
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import xmlrpc.client
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from collections import defaultdict
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from pathlib import Path
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@ -245,50 +254,116 @@ def pick_station(stations: list[dict]) -> float | None:
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return pick_station(stations)
|
||||
|
||||
|
||||
def tune_station(freq_mhz: float, gain: int = 10):
|
||||
"""Tune to an FM station using rtl_fm piped to aplay.
|
||||
XMLRPC_PORT = 8090
|
||||
GRC_TEMPLATE = Path(__file__).parent / "fm_receiver.grc"
|
||||
|
||||
rtl_fm demodulates wideband FM, resamples to 48 kHz mono,
|
||||
and pipes raw PCM to ALSA's aplay for real-time audio output.
|
||||
|
||||
def prepare_flowgraph(freq_mhz: float, gain: int = 10) -> Path:
|
||||
"""Create a tuned FM receiver GRC file from the template.
|
||||
|
||||
Patches the template with the requested frequency and gain, then
|
||||
compiles it with grcc. Returns the path to the compiled .py file.
|
||||
"""
|
||||
freq_hz = int(freq_mhz * 1e6)
|
||||
print(f"\n Tuning to {freq_mhz:.1f} MHz — Ctrl+C to stop\n")
|
||||
grc_text = GRC_TEMPLATE.read_text()
|
||||
|
||||
rtl_cmd = [
|
||||
"rtl_fm",
|
||||
"-f", str(freq_hz),
|
||||
"-M", "wbfm", # wideband FM demodulation
|
||||
"-s", "200k", # sample rate (200 kHz captures full FM channel)
|
||||
"-r", "48k", # resample output to 48 kHz
|
||||
"-g", str(gain),
|
||||
"-", # output to stdout
|
||||
]
|
||||
play_cmd = [
|
||||
"aplay",
|
||||
"-r", "48000", # 48 kHz sample rate
|
||||
"-f", "S16_LE", # signed 16-bit little-endian PCM
|
||||
"-t", "raw", # raw format (no WAV header)
|
||||
"-c", "1", # mono
|
||||
"-q", # quiet (no progress output)
|
||||
]
|
||||
# Patch frequency variable (value line under the freq block)
|
||||
grc_text = re.sub(
|
||||
r"(- name: freq\n id: variable\n parameters:\n comment: ''\n value: )[\d.eE+]+",
|
||||
rf"\g<1>{freq_mhz}e6",
|
||||
grc_text,
|
||||
)
|
||||
# Patch osmosdr RF gain (only the top-level gain0, not bb_gain0/if_gain0)
|
||||
grc_text = re.sub(r"((?<![_a-z])gain0: ')(\d+)(')", rf"\g<1>{gain}\3", grc_text)
|
||||
|
||||
work_dir = Path(tempfile.mkdtemp(prefix="fm_scanner_"))
|
||||
grc_path = work_dir / "fm_receiver.grc"
|
||||
grc_path.write_text(grc_text)
|
||||
|
||||
# Compile GRC → Python
|
||||
result = subprocess.run(
|
||||
["grcc", "-o", str(work_dir), str(grc_path)],
|
||||
capture_output=True, text=True,
|
||||
)
|
||||
if result.returncode != 0:
|
||||
print(f"Error: grcc compilation failed:\n{result.stderr}", file=sys.stderr)
|
||||
sys.exit(1)
|
||||
|
||||
# grcc uses the flowgraph's id as the filename (default.py for id: default)
|
||||
py_files = list(work_dir.glob("*.py"))
|
||||
if not py_files:
|
||||
print("Error: grcc produced no Python output.", file=sys.stderr)
|
||||
sys.exit(1)
|
||||
|
||||
return py_files[0]
|
||||
|
||||
|
||||
def wait_for_xmlrpc(url: str, timeout: float = 10.0) -> xmlrpc.client.ServerProxy:
|
||||
"""Wait for the XML-RPC server to become reachable."""
|
||||
proxy = xmlrpc.client.ServerProxy(url)
|
||||
deadline = time.monotonic() + timeout
|
||||
while time.monotonic() < deadline:
|
||||
try:
|
||||
proxy.get_freq()
|
||||
return proxy
|
||||
except ConnectionRefusedError:
|
||||
time.sleep(0.3)
|
||||
except Exception:
|
||||
# Fault from missing method is fine — server is up
|
||||
return proxy
|
||||
print("Error: flowgraph XML-RPC server did not start.", file=sys.stderr)
|
||||
sys.exit(1)
|
||||
|
||||
|
||||
def tune_station(freq_mhz: float, gain: int = 10):
|
||||
"""Launch a GNU Radio FM receiver and tune via XML-RPC.
|
||||
|
||||
Builds a flowgraph from the GRC template, compiles it with grcc,
|
||||
launches the Python flowgraph as a subprocess, and connects to its
|
||||
XML-RPC server for live frequency control — the same mechanism that
|
||||
gr-mcp uses for runtime parameter changes.
|
||||
"""
|
||||
print(f"\n Building FM receiver for {freq_mhz:.1f} MHz...")
|
||||
py_path = prepare_flowgraph(freq_mhz, gain)
|
||||
|
||||
url = f"http://localhost:{XMLRPC_PORT}"
|
||||
print(f" Launching flowgraph ({py_path.name})...")
|
||||
|
||||
fg_proc = subprocess.Popen(
|
||||
[sys.executable, str(py_path)],
|
||||
stderr=subprocess.DEVNULL,
|
||||
)
|
||||
|
||||
proxy = wait_for_xmlrpc(url)
|
||||
current = proxy.get_freq()
|
||||
print(f" Receiving {current / 1e6:.1f} MHz — enter frequency to retune, q to quit\n")
|
||||
|
||||
rtl_proc = None
|
||||
play_proc = None
|
||||
try:
|
||||
rtl_proc = subprocess.Popen(rtl_cmd, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL)
|
||||
play_proc = subprocess.Popen(play_cmd, stdin=rtl_proc.stdout, stderr=subprocess.DEVNULL)
|
||||
# Allow rtl_proc to receive SIGPIPE if play_proc exits
|
||||
rtl_proc.stdout.close()
|
||||
play_proc.wait()
|
||||
while fg_proc.poll() is None:
|
||||
try:
|
||||
cmd = input(" freq> ").strip()
|
||||
except EOFError:
|
||||
break
|
||||
if cmd.lower() in ("q", "quit", ""):
|
||||
break
|
||||
try:
|
||||
new_freq = float(cmd)
|
||||
if 87.5 <= new_freq <= 108.0:
|
||||
proxy.set_freq(new_freq * 1e6)
|
||||
print(f" Tuned to {new_freq:.1f} MHz")
|
||||
else:
|
||||
print(" Frequency must be 87.5–108.0 MHz.")
|
||||
except ValueError:
|
||||
print(" Enter a frequency (MHz) or q to quit.")
|
||||
except KeyboardInterrupt:
|
||||
print("\n Stopped.")
|
||||
except FileNotFoundError as e:
|
||||
print(f" Error: {e.filename} not found.", file=sys.stderr)
|
||||
finally:
|
||||
for proc in (play_proc, rtl_proc):
|
||||
if proc and proc.poll() is None:
|
||||
proc.send_signal(signal.SIGTERM)
|
||||
proc.wait(timeout=3)
|
||||
pass
|
||||
|
||||
print("\n Stopping flowgraph...")
|
||||
if fg_proc.poll() is None:
|
||||
fg_proc.send_signal(signal.SIGTERM)
|
||||
try:
|
||||
fg_proc.wait(timeout=5)
|
||||
except subprocess.TimeoutExpired:
|
||||
fg_proc.kill()
|
||||
|
||||
|
||||
def main():
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user