424 lines
11 KiB
Go
424 lines
11 KiB
Go
package main
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import (
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"crypto/ed25519"
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"crypto/rand"
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"crypto/x509"
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"encoding/binary"
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"encoding/pem"
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"flag"
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"fmt"
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"os"
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"os/signal"
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"syscall"
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"time"
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"git.metznet.ca/MetzNet/go-ncurses"
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"git.metznet.ca/MetzNet/pnyx"
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"github.com/gen2brain/malgo"
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"github.com/google/uuid"
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"github.com/hraban/opus"
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)
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var decoders = map[pnyx.PeerID]chan[]byte{}
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var encoder *opus.Encoder
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var sample_rate int = 0
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func set_sample_rate(audio_data chan []int16, new_sample_rate int) error {
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sample_rate = new_sample_rate
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var err error
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encoder, err = opus.NewEncoder(new_sample_rate, 1, opus.AppVoIP)
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if err != nil {
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return err
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}
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for peer_id, decoder_chan := range(decoders) {
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if decoder_chan != nil {
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decoder_chan <- nil
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}
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new_chan := make(chan[]byte, 1000)
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decoders[peer_id] = new_chan
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go handle_peer_decode(audio_data, peer_id, decoders[peer_id], sample_rate)
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}
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return nil
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}
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func handle_peer_decode(audio_data chan []int16, peer_id pnyx.PeerID, decode_chan chan[]byte, sample_rate int){
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decoder, err := opus.NewDecoder(sample_rate, 1)
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if err != nil {
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panic(err)
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}
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running := true
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missed := 0
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for running {
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select {
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case <-time.After(20*time.Millisecond):
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missed += 1
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if missed > 100 {
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decode_chan <- <- decode_chan
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}
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pcm := make([]int16, sample_rate/50)
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err := decoder.DecodePLC(pcm)
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if err != nil {
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panic(err)
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}
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audio_data <- pcm
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case data := <-decode_chan:
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missed = 0
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if data == nil {
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running = false
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} else {
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pcm := make([]int16, sample_rate/50*2)
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written, err := decoder.Decode(data, pcm)
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if err != nil {
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panic(err)
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}
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audio_data <- pcm[:written]
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}
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}
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}
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}
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func mixer(data_chan chan []int16, speaker_chan chan []int16) {
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var samples []int16 = nil
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for true {
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if samples == nil {
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samples = <- data_chan
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} else {
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select {
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case new_samples := <- data_chan:
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for i, sample := range(new_samples) {
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samples[i] += sample
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}
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case speaker_chan <- samples:
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samples = nil
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}
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}
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}
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}
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func setup_audio(mic chan []byte, speaker chan []int16) (*malgo.AllocatedContext, *malgo.Device, *malgo.Device) {
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ctx, err := malgo.InitContext(nil, malgo.ContextConfig{}, nil)
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if err != nil {
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panic(err)
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}
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infos, err := ctx.Devices(malgo.Playback)
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if err != nil {
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panic(err)
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}
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var playback_device *malgo.DeviceInfo = nil
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for _, info := range infos {
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if info.IsDefault != 0 {
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full, err := ctx.DeviceInfo(malgo.Playback, info.ID, malgo.Shared)
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if err != nil {
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panic(err)
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}
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playback_device = &full
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}
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}
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if playback_device == nil {
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panic("No default playback device")
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}
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infos, err = ctx.Devices(malgo.Capture)
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if err != nil {
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panic(err)
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}
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var capture_device *malgo.DeviceInfo = nil
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for _, info := range infos {
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if info.IsDefault != 0 {
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full, err := ctx.DeviceInfo(malgo.Capture, info.ID, malgo.Shared)
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if err != nil {
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panic(err)
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}
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capture_device = &full
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}
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}
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if capture_device == nil {
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panic("No default capture device")
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}
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inDeviceConfig := malgo.DefaultDeviceConfig(malgo.Capture)
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inDeviceConfig.Capture.Format = malgo.FormatS16
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inDeviceConfig.Capture.Channels = 1
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inDeviceConfig.Capture.DeviceID = capture_device.ID.Pointer()
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inDeviceConfig.SampleRate = 48000
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inDeviceConfig.PeriodSizeInFrames = 960
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inDeviceConfig.Alsa.NoMMap = 1
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inDeviceConfig.Capture.ShareMode = malgo.Shared
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outDeviceConfig := malgo.DefaultDeviceConfig(malgo.Playback)
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outDeviceConfig.Playback.Format = malgo.FormatS16
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outDeviceConfig.Playback.Channels = 1
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outDeviceConfig.Playback.DeviceID = playback_device.ID.Pointer()
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outDeviceConfig.SampleRate = 48000
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outDeviceConfig.PeriodSizeInFrames = 960
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outDeviceConfig.Alsa.NoMMap = 1
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outDeviceConfig.Playback.ShareMode = malgo.Shared
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onSendFrames := func(output_samples []byte, input_samples []byte, framecount uint32) {
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select {
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case pcm := <- speaker:
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for i := 0; i < sample_rate/50; i++ {
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binary.LittleEndian.PutUint16(output_samples[i*2:], uint16(pcm[i]))
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}
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default:
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}
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}
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playbackCallbacks := malgo.DeviceCallbacks{
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Data: onSendFrames,
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}
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outDevice, err := malgo.InitDevice(ctx.Context, outDeviceConfig, playbackCallbacks)
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if err != nil {
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panic(err)
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}
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err = outDevice.Start()
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if err != nil {
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panic(err)
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}
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onRecvFrames := func(output_samples []byte, input_samples []byte, framecount uint32) {
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if encoder != nil {
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pcm := make([]int16, len(input_samples)/2)
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for i := 0; i < len(input_samples)/2; i++ {
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pcm[i] = int16(binary.LittleEndian.Uint16(input_samples[2*i:]))
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}
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data := make([]byte, len(input_samples))
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written, err := encoder.Encode(pcm, data)
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if err != nil {
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panic(err)
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}
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select {
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case mic <- data[:written]:
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default:
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}
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}
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}
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captureCallbacks := malgo.DeviceCallbacks{
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Data: onRecvFrames,
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}
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inDevice, err := malgo.InitDevice(ctx.Context, inDeviceConfig, captureCallbacks)
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if err != nil {
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panic(err)
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}
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err = inDevice.Start()
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if err != nil {
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panic(err)
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}
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return ctx, outDevice, inDevice
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}
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func get_private_key(path string, generate bool) ed25519.PrivateKey {
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key_file_bytes, err := os.ReadFile(path)
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if err == nil {
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key_pem, _ := pem.Decode(key_file_bytes)
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if key_pem.Type != "PRIVATE KEY" {
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panic("Key file has wrong PEM format")
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}
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private_key, err := x509.ParsePKCS8PrivateKey(key_pem.Bytes)
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if err != nil {
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panic(err)
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}
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var ok bool
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key, ok := private_key.(ed25519.PrivateKey)
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if ok == false {
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panic("Private key is not ed25519.PrivateKey")
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}
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return key
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} else if generate {
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_, key, err := ed25519.GenerateKey(rand.Reader)
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if err != nil {
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panic(err)
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}
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key_pkcs8, err := x509.MarshalPKCS8PrivateKey(key)
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if err != nil {
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panic(err)
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}
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key_pem := pem.EncodeToMemory(&pem.Block{
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Type: "PRIVATE KEY",
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Bytes: key_pkcs8,
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})
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err = os.WriteFile(path, key_pem, 0o600)
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if err != nil {
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panic(err)
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}
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return key
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} else {
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panic(fmt.Sprintf("Failed to read key from %s", path))
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}
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}
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func main_loop(client *pnyx.Client, audio_data chan []int16, window ncurses.Window, packet_chan chan pnyx.Payload, user_chan chan rune) {
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max_y := ncurses.GetMaxY(window)
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max_x := ncurses.GetMaxX(window)
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titlebar := ncurses.NewWin(1, max_x, 0, 0)
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channels := ncurses.NewWin(max_y - 1, max_x / 3, 1, 0)
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body := ncurses.NewWin(max_y - 1, max_x * 2 / 3, 1, max_x / 3)
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ncurses.MvWAddStr(titlebar, 0, 0, fmt.Sprintf("pnyx client %X:%X", client.Key.Public().(ed25519.PublicKey)[:2], client.Session.ID[:2]))
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ncurses.MvWAddStr(body, 0, max_x-len(client.Remote()), client.Remote())
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ncurses.WRefresh(titlebar)
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for client.Active() {
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select {
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case packet := <-packet_chan:
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switch packet := packet.(type) {
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case pnyx.ChannelCommandPacket:
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if packet.Channel == pnyx.ChannelID(0) {
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if packet.Mode == pnyx.MODE_AUDIO {
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if packet.Command == pnyx.AUDIO_SET_SAMPLE_RATE {
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var new_sample_rate int
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switch pnyx.SampleRate(packet.Data[0]) {
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case pnyx.SAMPLE_RATE_24KHZ:
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new_sample_rate = 24000
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case pnyx.SAMPLE_RATE_48KHZ:
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new_sample_rate = 48000
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default:
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continue
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}
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err := set_sample_rate(audio_data, new_sample_rate)
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if err != nil {
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panic(err)
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}
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}
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}
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}
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case pnyx.PeerPacket:
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if packet.Channel == pnyx.ChannelID(0) {
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decode_chan, exists := decoders[packet.Peer]
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if exists == false {
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if sample_rate != 0 {
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decode_chan = make(chan[]byte, 1000)
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decoders[packet.Peer] = decode_chan
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go handle_peer_decode(audio_data, packet.Peer, decoders[packet.Peer], sample_rate)
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decode_chan <- packet.Data
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} else {
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decoders[packet.Peer] = nil
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}
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} else if decode_chan != nil {
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decode_chan <- packet.Data
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}
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}
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}
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case char := <-user_chan:
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ncurses.MvWAddStr(body, 0, 0, string(char))
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ncurses.WRefresh(body)
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ncurses.MvWAddStr(channels, 0, 0, string(char))
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ncurses.WRefresh(channels)
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}
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}
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}
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func bitmatch(b byte, pattern byte, length int) bool {
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mask := ^(byte(1 << (8 - length)) - 1)
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return (b ^ pattern) & mask == 0
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}
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func ch_listen(client *pnyx.Client, user_chan chan rune) {
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b := [4]byte{}
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for client.Active() {
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os.Stdin.Read(b[0:1])
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if bitmatch(b[0], 0b00000000, 1) {
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user_chan <- rune(b[0])
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} // TODO: further utf-8 support
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}
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}
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func process_mic(client *pnyx.Client, mic chan []byte) {
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for true {
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data := <- mic
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err := client.Send(pnyx.NewDataPacket(pnyx.ChannelID(0), pnyx.MODE_AUDIO, data))
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if err != nil {
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panic(err)
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}
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}
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}
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func main() {
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key_file_arg := flag.String("key", "${HOME}/.pnyx.key", "Path to the private key file to load/save")
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generate_key_arg := flag.Bool("genkey", false, "Set to generate a key if none exists")
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flag.Parse()
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var audio_data = make(chan []int16, 0)
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var speaker = make(chan []int16, 0)
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go mixer(audio_data, speaker)
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var mic = make(chan []byte, 0)
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ctx, outDevice, inDevice := setup_audio(mic, speaker)
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defer ctx.Free()
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defer ctx.Uninit()
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defer outDevice.Uninit()
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defer outDevice.Stop()
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defer inDevice.Uninit()
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defer inDevice.Stop()
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user_chan := make(chan rune, 1024)
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packet_chan := make(chan pnyx.Payload, 1024)
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key := get_private_key(os.ExpandEnv(*key_file_arg), *generate_key_arg)
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client, err := pnyx.NewClient(key, flag.Arg(0), func(payload pnyx.Payload) error {
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select {
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case packet_chan <- payload:
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return nil
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default:
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return fmt.Errorf("Channel overflow")
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}
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})
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if err != nil {
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panic(err)
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}
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join_packet := pnyx.NewChannelCommandPacket(uuid.New(), pnyx.ChannelID(0), pnyx.MODE_CHANNEL, pnyx.CHANNEL_COMMAND_JOIN, nil)
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err = client.Send(join_packet)
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if err != nil {
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panic(err)
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}
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get_sample_rate_packet := pnyx.NewChannelCommandPacket(uuid.New(), pnyx.ChannelID(0), pnyx.MODE_AUDIO, pnyx.AUDIO_SET_SAMPLE_RATE, []byte{byte(pnyx.SAMPLE_RATE_48KHZ)})
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err = client.Send(get_sample_rate_packet)
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if err != nil {
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panic(err)
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}
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go process_mic(client, mic)
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go ch_listen(client, user_chan)
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window := ncurses.InitScr()
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go main_loop(client, audio_data, window, packet_chan, user_chan)
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os_sigs := make(chan os.Signal, 1)
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signal.Notify(os_sigs, syscall.SIGINT, syscall.SIGABRT)
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<-os_sigs
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client.Close()
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ncurses.EndWin()
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}
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