sdr-wideband-suite/internal/config/config.go

package config

import (
	"os"
	"time"

	"gopkg.in/yaml.v3"
)

type Band struct {
	Name     string  `yaml:"name"`
	StartHz  float64 `yaml:"start_hz"`
	EndHz    float64 `yaml:"end_hz"`
}

type DetectorConfig struct {
	ThresholdDb   float64       `yaml:"threshold_db"`
	MinDurationMs int           `yaml:"min_duration_ms"`
	HoldMs        int           `yaml:"hold_ms"`
}

type Config struct {
	Bands           []Band         `yaml:"bands"`
	CenterHz        float64        `yaml:"center_hz"`
	SampleRate      int            `yaml:"sample_rate"`
	FFTSize         int            `yaml:"fft_size"`
	GainDb          float64        `yaml:"gain_db"`
	Detector        DetectorConfig `yaml:"detector"`
	WebAddr         string         `yaml:"web_addr"`
	EventPath       string         `yaml:"event_path"`
	FrameRate       int            `yaml:"frame_rate"`
	WaterfallLines  int            `yaml:"waterfall_lines"`
	WebRoot         string         `yaml:"web_root"`
}

func Default() Config {
	return Config{
		Bands: []Band{
			{Name: "example", StartHz: 99.5e6, EndHz: 100.5e6},
		},
		CenterHz:       100.0e6,
		SampleRate:     2_048_000,
		FFTSize:        2048,
		GainDb:         30,
		Detector:       DetectorConfig{ThresholdDb: -20, MinDurationMs: 250, HoldMs: 500},
		WebAddr:        ":8080",
		EventPath:      "data/events.jsonl",
		FrameRate:      15,
		WaterfallLines: 200,
		WebRoot:        "web",
	}
}

func Load(path string) (Config, error) {
	cfg := Default()
	b, err := os.ReadFile(path)
	if err != nil {
		return cfg, err
	}
	if err := yaml.Unmarshal(b, &cfg); err != nil {
		return cfg, err
	}
	if cfg.Detector.MinDurationMs <= 0 {
		cfg.Detector.MinDurationMs = 250
	}
	if cfg.Detector.HoldMs <= 0 {
		cfg.Detector.HoldMs = 500
	}
	if cfg.FrameRate <= 0 {
		cfg.FrameRate = 15
	}
	if cfg.WaterfallLines <= 0 {
		cfg.WaterfallLines = 200
	}
	if cfg.WebRoot == "" {
		cfg.WebRoot = "web"
	}
	if cfg.WebAddr == "" {
		cfg.WebAddr = ":8080"
	}
	if cfg.EventPath == "" {
		cfg.EventPath = "data/events.jsonl"
	}
	if cfg.SampleRate <= 0 {
		cfg.SampleRate = 2_048_000
	}
	if cfg.FFTSize <= 0 {
		cfg.FFTSize = 2048
	}
	if cfg.CenterHz == 0 {
		cfg.CenterHz = 100.0e6
	}
	return cfg, nil
}

func (c Config) FrameInterval() time.Duration {
	fps := c.FrameRate
	if fps <= 0 {
		fps = 15
	}
	return time.Second / time.Duration(fps)
}