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package extra
import (
"bytes"
"elefant/models"
"encoding/json"
"fmt"
"io"
"log/slog"
"net/http"
"time"
"github.com/gopxl/beep"
"github.com/gopxl/beep/mp3"
"github.com/gopxl/beep/speaker"
"github.com/neurosnap/sentences/english"
)
var (
TTSTextChan = make(chan string, 1000)
TTSDoneChan = make(chan bool, 1)
)
type Orator interface {
Speak(text string) error
GetLogger() *slog.Logger
}
// impl https://github.com/remsky/Kokoro-FastAPI
type KokoroOrator struct {
logger *slog.Logger
URL string
Format models.AudioFormat
Stream bool
Speed int8
Language string
}
func readroutine(orator Orator) {
tokenizer, _ := english.NewSentenceTokenizer(nil)
var sentenceBuf bytes.Buffer
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 <-TTSDoneChan:
// Flush remaining text
if remaining := sentenceBuf.String(); remaining != "" {
if err := orator.Speak(remaining); err != nil {
orator.GetLogger().Error("tts failed", "sentence", remaining, "error", err)
}
}
return
}
}
}
func InitOrator(log *slog.Logger, URL string) Orator {
orator := &KokoroOrator{
logger: log,
URL: URL,
Format: models.AFMP3,
Stream: false,
Speed: 1,
Language: "a",
}
go readroutine(orator)
return orator
}
// type AudioStream struct {
// TextChan chan string // Send text chunks here
// DoneChan chan bool // Close when streaming ends
// }
// func RunOrator(orator Orator) *AudioStream {
// stream := &AudioStream{
// TextChan: make(chan string, 1000),
// DoneChan: make(chan bool),
// }
// go func() {
// tokenizer, _ := english.NewSentenceTokenizer(nil)
// var sentenceBuf bytes.Buffer
// for {
// select {
// case chunk := <-stream.TextChan:
// 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 <-stream.DoneChan:
// // Flush remaining text
// if remaining := sentenceBuf.String(); remaining != "" {
// if err := orator.Speak(remaining); err != nil {
// orator.GetLogger().Error("tts failed", "sentence", remaining, "error", err)
// }
// }
// return
// }
// }
// }()
// return stream
// }
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": "af_bella(1)+af_sky(1)",
"response_format": "mp3",
"download_format": "mp3",
"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))
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 {
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()
speaker.Init(format.SampleRate, format.SampleRate.N(time.Second/10))
done := make(chan bool)
speaker.Play(beep.Seq(streamer, beep.Callback(func() {
close(done)
})))
<-done
return nil
}
|
