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winpulse.go
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/
winpulse.go
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// +build windows
/*
Binary winpulse captures Audio from Windows and streams it to a PulseAudio server.
It can stream with native protocol or over SSH with pacat.
It shows in systray with PulseAudio icon, right-click to exit.
Build with `-ldflags -H=windowsgui` to avoid launching a console window.
*/
package main
import (
"context"
"errors"
"flag"
"fmt"
"io"
"log"
"net"
"os"
"regexp"
"time"
"github.com/StalkR/winpulse/cygwin"
"github.com/StalkR/winpulse/icon"
"github.com/StalkR/winpulse/pulseaudio"
"github.com/StalkR/winpulse/winaudio"
"github.com/getlantern/systray"
"golang.org/x/crypto/ssh"
"golang.org/x/crypto/ssh/agent"
"golang.org/x/sync/errgroup"
)
var (
flagServer = flag.String("server", "", "PulseAudio server to connect to (host:port).")
flagSSH = flag.String("ssh", "", "PulseAudio server to connect to via SSH + pacat (user@host[:port]).")
)
var sshRE = regexp.MustCompile(`^([^@]*)@(.*)$`) // matches user@host[:port]
func main() {
flag.Parse()
if *flagServer == "" && *flagSSH == "" {
flag.PrintDefaults()
return
}
if *flagSSH != "" && !sshRE.MatchString(*flagSSH) {
log.Fatal("invalid user@host[:port]")
}
ctx := context.Background()
systray.Run(
func() { onReady(ctx) },
func() { os.Exit(0) },
)
}
func onReady(ctx context.Context) {
systray.SetTitle("WinPulse")
play := systray.AddMenuItem("Play", "Play")
play.Hide()
stop := systray.AddMenuItem("Stop", "Stop")
stop.Hide()
systray.AddSeparator()
exit := systray.AddMenuItem("Exit", "Exit")
go func() {
<-exit.ClickedCh
systray.Quit()
}()
for {
g, ctx := errgroup.WithContext(ctx)
g.Go(func() error {
return start(ctx)
})
g.Go(func() error {
systray.SetIcon(icon.Color)
stop.Show()
select {
case <-stop.ClickedCh:
stop.Hide()
return errStop
case <-ctx.Done():
return nil
}
})
if err := g.Wait(); err != nil && err != errStop {
log.Fatal(err)
}
log.Print("Stopped")
systray.SetTooltip("Stopped")
systray.SetIcon(icon.Gray)
play.Show()
<-play.ClickedCh
play.Hide()
}
}
func start(ctx context.Context) error {
parentCtx := ctx
g, ctx := errgroup.WithContext(ctx)
g.Go(func() error {
select {
case <-parentCtx.Done():
return errStop
case <-ctx.Done():
return nil
}
})
r, w := io.Pipe()
g.Go(func() error {
defer w.Close()
return winaudio.Capture(ctx, w)
})
g.Go(func() error {
defer r.Close()
for ; ; time.Sleep(time.Second) {
log.Print("Connecting to PulseAudio...")
systray.SetTooltip("Connecting to PulseAudio...")
if err := play(ctx, r); err != nil && err != io.EOF {
log.Printf("error: %v", err)
}
select {
case <-ctx.Done():
return nil
default:
}
}
})
if err := g.Wait(); err != nil && err != errStop {
return err
}
return nil
}
var errStop = errors.New("stop")
func play(ctx context.Context, stream io.Reader) error {
if *flagServer != "" {
return playNative(ctx, stream, *flagServer)
}
userHost := sshRE.FindStringSubmatch(*flagSSH)
if len(userHost) == 0 { // verified earlier anyway
return fmt.Errorf("invalid user@host[:port]")
}
return playSSH(ctx, stream, userHost[1], userHost[2])
}
func playNative(ctx context.Context, stream io.Reader, server string) error {
conn, err := net.Dial("tcp", server)
if err != nil {
return err
}
defer conn.Close()
log.Print("Connected to PulseAudio")
systray.SetTooltip("Connected to PulseAudio")
return pulseaudio.Play(ctx, conn, stream)
}
func playSSH(ctx context.Context, stream io.Reader, user, host string) error {
client, err := connectSSH(user, host)
if err != nil {
return err
}
defer client.Close()
log.Print("Connected to server")
session, err := client.NewSession()
if err != nil {
return err
}
defer session.Close()
session.Stdin = stream
if err := session.Start("pacat -p --format float32le"); err != nil {
return err
}
log.Print("Connected to PulseAudio")
systray.SetTooltip("Connected to PulseAudio")
return session.Wait()
}
func connectSSH(user, host string) (*ssh.Client, error) {
ag, err := cygwin.SSHAgent()
if err != nil {
return nil, err
}
defer ag.Close()
config := &ssh.ClientConfig{
User: user,
Auth: []ssh.AuthMethod{
ssh.PublicKeysCallback(agent.NewClient(ag).Signers),
},
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
}
return ssh.Dial("tcp", host, config)
}