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package extra
import (
"bytes"
"gf-lt/config"
"gf-lt/models"
"encoding/json"
"fmt"
"io"
"log/slog"
"net/http"
"strings"
"time"
"github.com/gopxl/beep/v2"
"github.com/gopxl/beep/v2/mp3"
"github.com/gopxl/beep/v2/speaker"
"github.com/neurosnap/sentences/english"
)
var (
TTSTextChan = make(chan string, 10000)
TTSFlushChan = make(chan bool, 1)
TTSDoneChan = make(chan bool, 1)
)
type Orator interface {
Speak(text string) error
Stop()
// pause and resume?
GetSBuilder() strings.Builder
GetLogger() *slog.Logger
}
// impl https://github.com/remsky/Kokoro-FastAPI
type KokoroOrator struct {
logger *slog.Logger
URL string
Format models.AudioFormat
Stream bool
Speed float32
Language string
Voice string
currentStream *beep.Ctrl // Added for playback control
textBuffer strings.Builder
}
func stoproutine(orator Orator) {
<-TTSDoneChan
orator.GetLogger().Info("orator got done signal")
orator.Stop()
// drain the channel
for len(TTSTextChan) > 0 {
<-TTSTextChan
}
}
func readroutine(orator Orator) {
tokenizer, _ := english.NewSentenceTokenizer(nil)
var sentenceBuf bytes.Buffer
var remainder strings.Builder
for {
select {
case chunk := <-TTSTextChan:
sentenceBuf.WriteString(chunk)
text := sentenceBuf.String()
sentences := tokenizer.Tokenize(text)
for i, sentence := range sentences {
if i == len(sentences)-1 {
sentenceBuf.Reset()
sentenceBuf.WriteString(sentence.Text)
continue
}
// Send complete sentence to TTS
if err := orator.Speak(sentence.Text); err != nil {
orator.GetLogger().Error("tts failed", "sentence", sentence.Text, "error", err)
}
}
case <-TTSFlushChan:
// lln is done get the whole message out
// FIXME: loses one token
for chunk := range TTSTextChan {
// orator.GetLogger().Info("flushing", "chunk", chunk)
// sentenceBuf.WriteString(chunk)
remainder.WriteString(chunk) // I get text here
if len(TTSTextChan) == 0 {
break
}
}
// INFO: if there is a lot of text it will take some time to make with tts at once
// to avoid this pause, it might be better to keep splitting on sentences
// but keepinig in mind that remainder could be ommited by tokenizer
// Flush remaining text
remaining := remainder.String()
remainder.Reset()
if remaining != "" {
// orator.GetLogger().Info("flushing", "remaining", remaining)
if err := orator.Speak(remaining); err != nil {
orator.GetLogger().Error("tts failed", "sentence", remaining, "error", err)
}
}
// case <-TTSDoneChan:
// orator.GetLogger().Info("orator got done signal")
// orator.Stop()
// // it that the best way to empty channel?
// close(TTSTextChan)
// TTSTextChan = make(chan string, 10000)
// return
}
}
}
func NewOrator(log *slog.Logger, cfg *config.Config) Orator {
orator := &KokoroOrator{
logger: log,
URL: cfg.TTS_URL,
Format: models.AFMP3,
Stream: false,
Speed: cfg.TTS_SPEED,
Language: "a",
Voice: "af_bella(1)+af_sky(1)",
}
go readroutine(orator)
go stoproutine(orator)
return orator
}
func (o *KokoroOrator) GetLogger() *slog.Logger {
return o.logger
}
func (o *KokoroOrator) requestSound(text string) (io.ReadCloser, error) {
payload := map[string]interface{}{
"input": text,
"voice": o.Voice,
"response_format": o.Format,
"download_format": o.Format,
"stream": o.Stream,
"speed": o.Speed,
// "return_download_link": true,
"lang_code": o.Language,
}
payloadBytes, err := json.Marshal(payload)
if err != nil {
return nil, fmt.Errorf("failed to marshal payload: %w", err)
}
req, err := http.NewRequest("POST", o.URL, bytes.NewBuffer(payloadBytes)) //nolint:noctx
if err != nil {
return nil, fmt.Errorf("failed to create request: %w", err)
}
req.Header.Set("accept", "application/json")
req.Header.Set("Content-Type", "application/json")
resp, err := http.DefaultClient.Do(req)
if err != nil {
return nil, fmt.Errorf("request failed: %w", err)
}
if resp.StatusCode != http.StatusOK {
defer resp.Body.Close()
return nil, fmt.Errorf("unexpected status code: %d", resp.StatusCode)
}
return resp.Body, nil
}
func (o *KokoroOrator) Speak(text string) error {
o.logger.Info("fn: Speak is called", "text-len", len(text))
body, err := o.requestSound(text)
if err != nil {
o.logger.Error("request failed", "error", err)
return fmt.Errorf("request failed: %w", err)
}
defer body.Close()
// Decode the mp3 audio from response body
streamer, format, err := mp3.Decode(body)
if err != nil {
o.logger.Error("mp3 decode failed", "error", err)
return fmt.Errorf("mp3 decode failed: %w", err)
}
defer streamer.Close()
// here it spams with errors that speaker cannot be initialized more than once, but how would we deal with many audio records then?
if err := speaker.Init(format.SampleRate, format.SampleRate.N(time.Second/10)); err != nil {
o.logger.Debug("failed to init speaker", "error", err)
}
done := make(chan bool)
// Create controllable stream and store reference
o.currentStream = &beep.Ctrl{Streamer: beep.Seq(streamer, beep.Callback(func() {
close(done)
o.currentStream = nil
})), Paused: false}
speaker.Play(o.currentStream)
<-done // we hang in this routine;
return nil
}
// TODO: stop works; but new stream does not start afterwards
func (o *KokoroOrator) Stop() {
// speaker.Clear()
o.logger.Info("attempted to stop orator", "orator", o)
speaker.Lock()
defer speaker.Unlock()
if o.currentStream != nil {
o.currentStream.Paused = true
o.currentStream.Streamer = nil
}
}
func (o *KokoroOrator) GetSBuilder() strings.Builder {
return o.textBuffer
}
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