Maksim Totmin
4c34f0bedc
Streams H.264 to the Galahad II LCD via USB (gousb) with: - ffmpeg CLI transcoding (no fragile FFmpeg C-ABI bindings) - pure-Go Annex-B access-unit splitting - framerate pacing with graceful shutdown and USB reconnect - TOML config, cobra CLI, structured slog logging, unit tests
58 lines
1.4 KiB
Go
58 lines
1.4 KiB
Go
package device
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import (
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"context"
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"fmt"
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"github.com/google/gousb"
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)
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// Info describes a USB device for the diagnostics listing.
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type Info struct {
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VendorID int
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ProductID int
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Manufacturer string
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Product string
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Serial string
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Bus int
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Address int
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IsLCD bool
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}
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// ListDevices enumerates all USB devices visible to libusb. Descriptor
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// strings are best-effort: reading them requires device access, which is
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// why failures are ignored.
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func ListDevices(ctx context.Context) ([]Info, error) {
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gctx := gousb.NewContext()
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defer gctx.Close()
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devs, err := gctx.OpenDevices(func(*gousb.DeviceDesc) bool { return true })
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if err != nil && len(devs) == 0 {
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return nil, fmt.Errorf("enumerate USB devices (run as root or install the udev rule): %w", err)
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}
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defer func() {
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for _, d := range devs {
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_ = d.Close()
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}
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}()
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infos := make([]Info, 0, len(devs))
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for _, d := range devs {
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info := Info{
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VendorID: int(d.Desc.Vendor),
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ProductID: int(d.Desc.Product),
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Bus: d.Desc.Bus,
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Address: d.Desc.Address,
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IsLCD: d.Desc.Vendor == gousb.ID(0x0416) && d.Desc.Product == gousb.ID(0x7395),
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}
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if info.IsLCD {
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// Only read strings for the device we care about.
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info.Manufacturer, _ = d.Manufacturer()
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info.Product, _ = d.Product()
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info.Serial, _ = d.SerialNumber()
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}
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infos = append(infos, info)
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}
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return infos, err
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}
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