1 files changed, 185 insertions, 0 deletions
diff --git a/extra/audio.go b/extra/audio.go
new file mode 100644
index 0000000..ae3300c
--- /dev/null
+++ b/extra/audio.go
@@ -0,0 +1,185 @@
+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
+}