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179 lines
3.7 KiB
179 lines
3.7 KiB
package main
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// #cgo pkg-config: libpulse-simple
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// #include <stdlib.h>
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// #include <pulse/simple.h>
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// #include <pulse/error.h>
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import "C"
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import (
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"errors"
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"flag"
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"github.com/jart/gosip/dsp"
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"github.com/jart/gosip/rtp"
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"github.com/jart/gosip/sdp"
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"github.com/jart/gosip/sip"
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"github.com/jart/gosip/util"
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"net"
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"os"
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"time"
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"unsafe"
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)
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const (
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hz = 8000
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chans = 1
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ptime = 20
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ssize = 2
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psamps = hz / (1000 / ptime) * chans
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pbytes = psamps * ssize
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filename = "/var/lib/asterisk/sounds/en/cc-yougotpranked.s16"
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)
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var (
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address = flag.String("sipAddress", ":9020", "Listen address")
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paServerFlag = flag.String("paServer", "", "Pulse Audio server name")
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paSinkFlag = flag.String("paSink", "", "Pulse Audio device or sink name")
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paName = C.CString("fone")
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)
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func main() {
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pa, err := makePulseAudio(C.PA_STREAM_PLAYBACK, filename)
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if err != nil {
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panic(err)
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}
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defer C.pa_simple_free(pa)
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defer C.pa_simple_flush(pa, nil)
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f, err := os.Open(filename)
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if err != nil {
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panic(err)
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}
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defer f.Close()
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tick := time.NewTicker(ptime * time.Millisecond)
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defer tick.Stop()
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func() {
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for {
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var buf [pbytes]byte
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select {
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case <-tick.C:
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got, _ := f.Read(buf[:])
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if got < pbytes {
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return
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}
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var paerr C.int
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if C.pa_simple_write(pa, unsafe.Pointer(&buf[0]), pbytes, &paerr) != 0 {
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panic(C.GoString(C.pa_strerror(paerr)))
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}
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}
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}
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}()
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os.Exit(0)
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// Create RTP audio session.
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rs, err := rtp.NewSession("")
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if err != nil {
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panic(err)
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}
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defer rs.Close()
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rtpPort := uint16(rs.Sock.LocalAddr().(*net.UDPAddr).Port)
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invite := &sip.Msg{
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Method: sip.MethodInvite,
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Request: &sip.URI{User: "echo", Host: "127.0.0.1", Port: 5060},
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Payload: &sdp.SDP{
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Origin: sdp.Origin{ID: util.GenerateOriginID()},
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Audio: &sdp.Media{
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Port: rtpPort,
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Codecs: []sdp.Codec{sdp.ULAWCodec, sdp.DTMFCodec},
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},
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},
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}
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// Create a SIP phone call.
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dl, err := sip.NewDialog(invite)
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if err != nil {
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panic(err)
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}
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// We're going to send white noise every 20ms.
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var frame rtp.Frame
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awgn := dsp.NewAWGN(-45.0)
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ticker := time.NewTicker(20 * time.Millisecond)
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defer ticker.Stop()
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// Hangup after 200ms.
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death := time.After(200 * time.Millisecond)
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// Let's GO!
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var answered bool
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for {
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select {
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case <-ticker.C:
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for n := 0; n < 160; n++ {
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frame[n] = awgn.Get()
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}
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if err := rs.Send(&frame); err != nil {
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panic("RTP send failed: " + err.Error())
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}
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case err := <-dl.OnErr:
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panic(err)
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case state := <-dl.OnState:
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switch state {
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case sip.DialogAnswered:
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answered = true
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case sip.DialogHangup:
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if !answered {
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panic("Call didn't get answered!")
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}
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return
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}
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case rs.Peer = <-dl.OnPeer:
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case frame := <-rs.C:
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rs.R <- frame
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case err := <-rs.E:
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panic("RTP recv failed: " + err.Error())
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rs.CloseAfterError()
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dl.Hangup <- true
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case <-death:
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dl.Hangup <- true
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}
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}
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}
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func makePulseAudio(direction C.pa_stream_direction_t, streamName string) (*C.pa_simple, error) {
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var ss C.pa_sample_spec
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ss.format = C.PA_SAMPLE_S16NE
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ss.rate = hz
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ss.channels = chans
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var ba C.pa_buffer_attr
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ba.maxlength = pbytes * 4
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ba.tlength = pbytes
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ba.prebuf = pbytes * 2
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ba.minreq = pbytes
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ba.fragsize = 0xffffffff
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var paServer *C.char
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if *paServerFlag != "" {
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paServer = C.CString(*paServerFlag)
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defer C.free(unsafe.Pointer(paServer))
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}
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var paSink *C.char
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if *paSinkFlag != "" {
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paSink = C.CString(*paSinkFlag)
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defer C.free(unsafe.Pointer(paSink))
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}
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paStreamName := C.CString(streamName)
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defer C.free(unsafe.Pointer(paStreamName))
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var paerr C.int
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pa := C.pa_simple_new(paServer, paName, direction, paSink, paStreamName, &ss, nil, &ba, &paerr)
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if pa == nil {
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return nil, errors.New(C.GoString(C.pa_strerror(paerr)))
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}
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return pa, nil
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}
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