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//go:build extra
// +build extra
package extra
import (
"fmt"
"gf-lt/models"
"io"
"log/slog"
"os/exec"
"strings"
"sync"
google_translate_tts "github.com/GrailFinder/google-translate-tts"
"github.com/neurosnap/sentences/english"
)
type GoogleTranslateOrator struct {
logger *slog.Logger
mu sync.Mutex
speech *google_translate_tts.Speech
// fields for playback control
cmd *exec.Cmd
cmdMu sync.Mutex
stopCh chan struct{}
// text buffer and interrupt flag
textBuffer strings.Builder
interrupt bool
Speed float32
}
func (o *GoogleTranslateOrator) stoproutine() {
for {
<-TTSDoneChan
o.logger.Debug("orator got done signal")
o.Stop()
for len(TTSTextChan) > 0 {
<-TTSTextChan
}
o.mu.Lock()
o.textBuffer.Reset()
o.interrupt = true
o.mu.Unlock()
}
}
func (o *GoogleTranslateOrator) readroutine() {
tokenizer, _ := english.NewSentenceTokenizer(nil)
for {
select {
case chunk := <-TTSTextChan:
o.mu.Lock()
o.interrupt = false
_, err := o.textBuffer.WriteString(chunk)
if err != nil {
o.logger.Warn("failed to write to stringbuilder", "error", err)
o.mu.Unlock()
continue
}
text := o.textBuffer.String()
sentences := tokenizer.Tokenize(text)
o.logger.Debug("adding chunk", "chunk", chunk, "text", text, "sen-len", len(sentences))
if len(sentences) <= 1 {
o.mu.Unlock()
continue
}
completeSentences := sentences[:len(sentences)-1]
remaining := sentences[len(sentences)-1].Text
o.textBuffer.Reset()
o.textBuffer.WriteString(remaining)
o.mu.Unlock()
for _, sentence := range completeSentences {
o.mu.Lock()
interrupted := o.interrupt
o.mu.Unlock()
if interrupted {
return
}
cleanedText := models.CleanText(sentence.Text)
if cleanedText == "" {
continue
}
o.logger.Debug("calling Speak with sentence", "sent", cleanedText)
if err := o.Speak(cleanedText); err != nil {
o.logger.Error("tts failed", "sentence", cleanedText, "error", err)
}
}
case <-TTSFlushChan:
o.logger.Debug("got flushchan signal start")
// lln is done get the whole message out
if len(TTSTextChan) > 0 { // otherwise might get stuck
for chunk := range TTSTextChan {
o.mu.Lock()
_, err := o.textBuffer.WriteString(chunk)
o.mu.Unlock()
if err != nil {
o.logger.Warn("failed to write to stringbuilder", "error", err)
continue
}
if len(TTSTextChan) == 0 {
break
}
}
}
o.mu.Lock()
remaining := o.textBuffer.String()
remaining = models.CleanText(remaining)
o.textBuffer.Reset()
o.mu.Unlock()
if remaining == "" {
continue
}
o.logger.Debug("calling Speak with remainder", "rem", remaining)
sentencesRem := tokenizer.Tokenize(remaining)
for _, rs := range sentencesRem { // to avoid dumping large volume of text
o.mu.Lock()
interrupt := o.interrupt
o.mu.Unlock()
if interrupt {
break
}
if err := o.Speak(rs.Text); err != nil {
o.logger.Error("tts failed", "sentence", rs.Text, "error", err)
}
}
}
}
}
func (o *GoogleTranslateOrator) GetLogger() *slog.Logger {
return o.logger
}
func (o *GoogleTranslateOrator) Speak(text string) error {
o.logger.Debug("fn: Speak is called", "text-len", len(text))
// Generate MP3 data directly as an io.Reader
reader, err := o.speech.GenerateSpeech(text)
if err != nil {
return fmt.Errorf("generate speech failed: %w", err)
}
// Wrap in io.NopCloser since GenerateSpeech returns io.Reader (no close needed)
body := io.NopCloser(reader)
defer body.Close()
// Build ffplay command with optional speed filter
args := []string{"-nodisp", "-autoexit"}
if o.Speed > 0.1 && o.Speed != 1.0 {
// atempo range is 0.5 to 2.0; you might clamp it here
args = append(args, "-af", fmt.Sprintf("atempo=%.2f", o.Speed))
}
args = append(args, "-i", "pipe:0")
cmd := exec.Command("ffplay", args...)
stdin, err := cmd.StdinPipe()
if err != nil {
return fmt.Errorf("failed to get stdin pipe: %w", err)
}
o.cmdMu.Lock()
o.cmd = cmd
o.stopCh = make(chan struct{})
o.cmdMu.Unlock()
if err := cmd.Start(); err != nil {
return fmt.Errorf("failed to start ffplay: %w", err)
}
copyErr := make(chan error, 1)
go func() {
_, err := io.Copy(stdin, body)
stdin.Close()
copyErr <- err
}()
done := make(chan error, 1)
go func() {
done <- cmd.Wait()
}()
select {
case <-o.stopCh:
if o.cmd != nil && o.cmd.Process != nil {
o.cmd.Process.Kill()
}
<-done
return nil
case copyErrVal := <-copyErr:
if copyErrVal != nil {
if o.cmd != nil && o.cmd.Process != nil {
o.cmd.Process.Kill()
}
<-done
return copyErrVal
}
return <-done
case err := <-done:
return err
}
}
func (o *GoogleTranslateOrator) Stop() {
o.cmdMu.Lock()
defer o.cmdMu.Unlock()
// Signal any running Speak to stop
if o.stopCh != nil {
select {
case <-o.stopCh: // already closed
default:
close(o.stopCh)
}
o.stopCh = nil
}
// Kill the external player process if it's still running
if o.cmd != nil && o.cmd.Process != nil {
o.cmd.Process.Kill()
o.cmd.Wait() // clean up zombie process
o.cmd = nil
}
// Also reset text buffer and interrupt flag (with o.mu)
o.mu.Lock()
o.textBuffer.Reset()
o.interrupt = true
o.mu.Unlock()
}
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