You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
297 lines
6.7 KiB
297 lines
6.7 KiB
// Copyright 2020 Justine Alexandra Roberts Tunney
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package main
|
|
|
|
// #cgo pkg-config: ncurses libpulse-simple
|
|
// #include <stdlib.h>
|
|
// #include <ncurses.h>
|
|
// #include <pulse/simple.h>
|
|
// #include <pulse/error.h>
|
|
import "C"
|
|
|
|
import (
|
|
"errors"
|
|
"flag"
|
|
"fmt"
|
|
"io/ioutil"
|
|
"log"
|
|
"net"
|
|
"net/http"
|
|
"os"
|
|
"os/signal"
|
|
"time"
|
|
"unsafe"
|
|
|
|
"github.com/jart/gosip/dialog"
|
|
"github.com/jart/gosip/dsp"
|
|
"github.com/jart/gosip/rtp"
|
|
"github.com/jart/gosip/sdp"
|
|
"github.com/jart/gosip/sip"
|
|
"github.com/jart/gosip/util"
|
|
)
|
|
|
|
const (
|
|
hz = 8000
|
|
chans = 1
|
|
ptime = 20
|
|
ssize = 2
|
|
psamps = hz / (1000 / ptime) * chans
|
|
pbytes = psamps * ssize
|
|
)
|
|
|
|
var (
|
|
addressFlag = flag.String("address", "", "Public IP (or hostname) of the local machine. Defaults to asking an untrusted webserver.")
|
|
paServerFlag = flag.String("paServer", "", "PulseAudio server name")
|
|
paSinkFlag = flag.String("paSink", "", "PulseAudio device or sink name")
|
|
muteFlag = flag.Bool("mute", false, "Send comfort noise rather than microphone input")
|
|
paName = C.CString("fone")
|
|
)
|
|
|
|
func main() {
|
|
log.SetFlags(log.LstdFlags | log.Lmicroseconds | log.Lshortfile)
|
|
flag.Usage = func() {
|
|
fmt.Fprintf(os.Stderr, "Usage: %s URI\n", os.Args[0])
|
|
flag.PrintDefaults()
|
|
}
|
|
flag.Parse()
|
|
if len(flag.Args()) != 1 {
|
|
flag.Usage()
|
|
os.Exit(1)
|
|
}
|
|
|
|
// Whom Are We Calling?
|
|
requestURIString := flag.Args()[0]
|
|
requestURI, err := sip.ParseURI([]byte(requestURIString))
|
|
if err != nil {
|
|
fmt.Fprintf(os.Stderr, "Bad Request URI: %s\n", err.Error())
|
|
os.Exit(1)
|
|
}
|
|
|
|
// Computer Speaker
|
|
speaker, err := makePulseAudio(C.PA_STREAM_PLAYBACK, requestURIString)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
defer C.pa_simple_free(speaker)
|
|
defer C.pa_simple_flush(speaker, nil)
|
|
|
|
// Computer Microphone
|
|
mic, err := makePulseAudio(C.PA_STREAM_RECORD, requestURIString)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
defer C.pa_simple_free(mic)
|
|
|
|
// Get Public IP Address
|
|
publicIP := *addressFlag
|
|
if publicIP == "" {
|
|
publicIP, err = getPublicIP()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
}
|
|
|
|
// Create RTP Session
|
|
rs, err := rtp.NewSession("")
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
defer rs.Close()
|
|
rtpPort := uint16(rs.Sock.LocalAddr().(*net.UDPAddr).Port)
|
|
|
|
// Construct SIP INVITE
|
|
invite := &sip.Msg{
|
|
Method: sip.MethodInvite,
|
|
Request: requestURI,
|
|
Via: &sip.Via{Host: publicIP},
|
|
To: &sip.Addr{Uri: requestURI},
|
|
From: &sip.Addr{Uri: &sip.URI{Host: publicIP, User: os.Getenv("USER")}},
|
|
Contact: &sip.Addr{Uri: &sip.URI{Host: publicIP}},
|
|
Payload: &sdp.SDP{
|
|
Addr: publicIP,
|
|
Origin: sdp.Origin{
|
|
ID: util.GenerateOriginID(),
|
|
Addr: publicIP,
|
|
},
|
|
Audio: &sdp.Media{
|
|
Port: rtpPort,
|
|
Codecs: []sdp.Codec{sdp.ULAWCodec, sdp.DTMFCodec},
|
|
},
|
|
},
|
|
Warning: "dark lord funk you up",
|
|
}
|
|
|
|
// Create SIP Dialog State Machine
|
|
dl, err := dialog.NewDialog(invite)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
// Send Audio Every 20ms
|
|
var frame rtp.Frame
|
|
awgn := dsp.NewAWGN(-45.0)
|
|
ticker := time.NewTicker(ptime * time.Millisecond)
|
|
defer ticker.Stop()
|
|
|
|
// Ctrl+C or Kill Graceful Shutdown
|
|
death := make(chan os.Signal, 1)
|
|
signal.Notify(death, os.Interrupt, os.Kill)
|
|
|
|
// DTMF Terminal Input
|
|
keyboard := make(chan byte)
|
|
keyboardStart := func() {
|
|
C.cbreak()
|
|
C.noecho()
|
|
go func() {
|
|
var buf [1]byte
|
|
for {
|
|
amt, err := os.Stdin.Read(buf[:])
|
|
if err != nil || amt != 1 {
|
|
log.Printf("Keyboard: %s\r\n", err)
|
|
return
|
|
}
|
|
keyboard <- buf[0]
|
|
}
|
|
}()
|
|
}
|
|
|
|
C.initscr()
|
|
defer C.endwin()
|
|
|
|
// Let's GO!
|
|
var answered bool
|
|
var paerr C.int
|
|
for {
|
|
select {
|
|
|
|
// Send Audio
|
|
case <-ticker.C:
|
|
if *muteFlag {
|
|
for n := 0; n < psamps; n++ {
|
|
frame[n] = awgn.Get()
|
|
}
|
|
} else {
|
|
if C.pa_simple_read(mic, unsafe.Pointer(&frame[0]), pbytes, &paerr) != 0 {
|
|
log.Printf("Microphone: %s\r\n", C.GoString(C.pa_strerror(paerr)))
|
|
break
|
|
}
|
|
}
|
|
if err := rs.Send(&frame); err != nil {
|
|
log.Printf("RTP: %s\r\n", err.Error())
|
|
}
|
|
|
|
// Send DTMF
|
|
case ch := <-keyboard:
|
|
if err := rs.SendDTMF(ch); err != nil {
|
|
log.Printf("DTMF: %s\r\n", err.Error())
|
|
break
|
|
}
|
|
log.Printf("DTMF: %c\r\n", ch)
|
|
|
|
// Receive Audio
|
|
case frame := <-rs.C:
|
|
if len(frame) != psamps {
|
|
log.Printf("RTP: Received undersized frame: %d != %d\r\n", len(frame), psamps)
|
|
} else {
|
|
if C.pa_simple_write(speaker, unsafe.Pointer(&frame[0]), pbytes, &paerr) != 0 {
|
|
log.Printf("Speaker: %s\r\n", C.GoString(C.pa_strerror(paerr)))
|
|
}
|
|
}
|
|
rs.R <- frame
|
|
|
|
// Signalling
|
|
case rs.Peer = <-dl.OnPeer:
|
|
case state := <-dl.OnState:
|
|
switch state {
|
|
case dialog.Answered:
|
|
answered = true
|
|
keyboardStart()
|
|
case dialog.Hangup:
|
|
if answered {
|
|
return
|
|
} else {
|
|
os.Exit(1)
|
|
}
|
|
}
|
|
|
|
// Errors and Interruptions
|
|
case err := <-dl.OnErr:
|
|
log.Fatalf("SIP: %s\r\n", err.Error())
|
|
case err := <-rs.E:
|
|
log.Printf("RTP: %s\r\n", err.Error())
|
|
rs.CloseAfterError()
|
|
dl.Hangup <- true
|
|
case <-death:
|
|
dl.Hangup <- true
|
|
}
|
|
}
|
|
}
|
|
|
|
func makePulseAudio(direction C.pa_stream_direction_t, streamName string) (*C.pa_simple, error) {
|
|
var ss C.pa_sample_spec
|
|
ss.format = C.PA_SAMPLE_S16NE
|
|
ss.rate = hz
|
|
ss.channels = chans
|
|
|
|
var ba C.pa_buffer_attr
|
|
if direction == C.PA_STREAM_PLAYBACK {
|
|
ba.maxlength = pbytes * 4
|
|
ba.tlength = pbytes
|
|
ba.prebuf = pbytes * 2
|
|
ba.minreq = pbytes
|
|
ba.fragsize = 0xffffffff
|
|
} else {
|
|
ba.maxlength = pbytes * 4
|
|
ba.tlength = 0xffffffff
|
|
ba.prebuf = 0xffffffff
|
|
ba.minreq = 0xffffffff
|
|
ba.fragsize = pbytes
|
|
}
|
|
|
|
var paServer *C.char
|
|
if *paServerFlag != "" {
|
|
paServer = C.CString(*paServerFlag)
|
|
defer C.free(unsafe.Pointer(paServer))
|
|
}
|
|
|
|
var paSink *C.char
|
|
if *paSinkFlag != "" {
|
|
paSink = C.CString(*paSinkFlag)
|
|
defer C.free(unsafe.Pointer(paSink))
|
|
}
|
|
|
|
paStreamName := C.CString(streamName)
|
|
defer C.free(unsafe.Pointer(paStreamName))
|
|
|
|
var paerr C.int
|
|
pa := C.pa_simple_new(paServer, paName, direction, paSink, paStreamName, &ss, nil, &ba, &paerr)
|
|
if pa == nil {
|
|
return nil, errors.New(C.GoString(C.pa_strerror(paerr)))
|
|
}
|
|
return pa, nil
|
|
}
|
|
|
|
func getPublicIP() (string, error) {
|
|
resp, err := http.Get("http://api.ipify.org")
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
defer resp.Body.Close()
|
|
body, err := ioutil.ReadAll(resp.Body)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
return string(body), nil
|
|
}
|