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|
package soundbox
import (
"context"
"errors"
"fmt"
"io"
"net"
"os/exec"
"time"
)
// streamingPort is the default network port a soundbox is listening to for
// incoming audio stream data.
const streamingPort = 5316
const bufferSize = 20
const writeTimeout = 1 * time.Second
// StreamURLContext streams audio from a given URL to one or multiple soundbox
// devices. The devices are referenced via their MAC addresses given by the
// targets argument. The ctx argument is passed to cancel the streaming.
func StreamURLContext(ctx context.Context, url string, targets []net.HardwareAddr) error {
iface, err := getInterface()
if err != nil {
return err
}
ips := make([]net.IP, 0)
for _, target := range targets {
ip, err := toLinkLocal(target)
if err != nil {
return err
}
ips = append(ips, ip)
}
conns := make([]net.Conn, 0)
for _, ip := range ips {
var d net.Dialer
conn, err := d.DialContext(
ctx,
"tcp6",
fmt.Sprintf("[%s%%%s]:%d", ip, iface.Name, streamingPort),
)
if err != nil {
return err
}
conns = append(conns, conn)
}
defer func() {
for _, conn := range conns {
conn.Close()
}
}()
args := []string{
"-re",
"-i",
url,
"-acodec",
"flac",
"-f",
"ogg",
"-",
}
cmd := exec.CommandContext(ctx, "ffmpeg", args...)
stdout, err := cmd.StdoutPipe()
if err != nil {
return err
}
err = cmd.Start()
if err != nil {
return err
}
for {
buffer := make([]byte, bufferSize)
i, err := stdout.Read(buffer)
if err != nil {
if errors.Is(err, io.EOF) {
break
} else {
return err
}
}
for _, conn := range conns {
conn.SetDeadline(time.Now().Add(writeTimeout))
_, err = conn.Write(buffer[:i])
if err != nil {
return err
}
}
}
return cmd.Wait()
}
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