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|
//go:build extra
// +build extra
package extra
import (
"bytes"
"context"
"errors"
"fmt"
"gf-lt/config"
"log/slog"
"os"
"os/exec"
"strings"
"sync"
"syscall"
"time"
)
type WhisperBinary struct {
logger *slog.Logger
whisperPath string
modelPath string
lang string
// Per-recording fields (protected by mu)
mu sync.Mutex
recording bool
tempFile string
ctx context.Context
cancel context.CancelFunc
cmd *exec.Cmd
cmdMu sync.Mutex
}
func (w *WhisperBinary) StartRecording() error {
w.mu.Lock()
defer w.mu.Unlock()
if w.recording {
return errors.New("recording is already in progress")
}
// Fresh context for this recording
ctx, cancel := context.WithCancel(context.Background())
w.ctx = ctx
w.cancel = cancel
// Create temporary file
tempFile, err := os.CreateTemp("", "recording_*.wav")
if err != nil {
cancel()
return fmt.Errorf("failed to create temp file: %w", err)
}
tempFile.Close()
w.tempFile = tempFile.Name()
// ffmpeg command: capture from default microphone, write WAV
args := []string{
"-f", "alsa", // or "pulse" if preferred
"-i", "default",
"-acodec", "pcm_s16le",
"-ar", "16000",
"-ac", "1",
"-y", // overwrite output file
w.tempFile,
}
cmd := exec.CommandContext(w.ctx, "ffmpeg", args...)
// Capture stderr for debugging (optional, but useful for diagnosing)
stderr, err := cmd.StderrPipe()
if err != nil {
cancel()
os.Remove(w.tempFile)
return fmt.Errorf("failed to create stderr pipe: %w", err)
}
go func() {
buf := make([]byte, 1024)
for {
n, err := stderr.Read(buf)
if n > 0 {
w.logger.Debug("ffmpeg stderr", "output", string(buf[:n]))
}
if err != nil {
break
}
}
}()
w.cmdMu.Lock()
w.cmd = cmd
w.cmdMu.Unlock()
if err := cmd.Start(); err != nil {
cancel()
os.Remove(w.tempFile)
return fmt.Errorf("failed to start ffmpeg: %w", err)
}
w.recording = true
w.logger.Debug("Recording started", "file", w.tempFile)
return nil
}
func (w *WhisperBinary) StopRecording() (string, error) {
w.mu.Lock()
defer w.mu.Unlock()
if !w.recording {
return "", errors.New("not currently recording")
}
w.recording = false
// Gracefully stop ffmpeg
w.cmdMu.Lock()
if w.cmd != nil && w.cmd.Process != nil {
w.logger.Debug("Sending SIGTERM to ffmpeg")
w.cmd.Process.Signal(syscall.SIGTERM)
// Wait for process to exit (up to 2 seconds)
done := make(chan error, 1)
go func() {
done <- w.cmd.Wait()
}()
select {
case <-done:
w.logger.Debug("ffmpeg exited after SIGTERM")
case <-time.After(2 * time.Second):
w.logger.Warn("ffmpeg did not exit, sending SIGKILL")
w.cmd.Process.Kill()
<-done
}
}
w.cmdMu.Unlock()
// Cancel context (already done, but for cleanliness)
if w.cancel != nil {
w.cancel()
}
// Validate temp file
if w.tempFile == "" {
return "", errors.New("no recording file")
}
defer os.Remove(w.tempFile)
info, err := os.Stat(w.tempFile)
if err != nil {
return "", fmt.Errorf("failed to stat temp file: %w", err)
}
if info.Size() < 44 { // WAV header is 44 bytes
// Log ffmpeg stderr? Already captured in debug logs.
return "", fmt.Errorf("recording file too small (%d bytes), possibly no audio captured", info.Size())
}
// Run whisper.cpp binary
cmd := exec.Command(w.whisperPath, "-m", w.modelPath, "-l", w.lang, w.tempFile)
var outBuf, errBuf bytes.Buffer
cmd.Stdout = &outBuf
cmd.Stderr = &errBuf
if err := cmd.Run(); err != nil {
w.logger.Error("whisper binary failed",
"error", err,
"stderr", errBuf.String(),
"file_size", info.Size())
return "", fmt.Errorf("whisper binary failed: %w (stderr: %s)", err, errBuf.String())
}
result := strings.TrimRight(outBuf.String(), "\n")
result = specialRE.ReplaceAllString(result, "")
return strings.TrimSpace(strings.ReplaceAll(result, "\n ", "\n")), nil
}
// IsRecording returns true if a recording is in progress.
func (w *WhisperBinary) IsRecording() bool {
w.mu.Lock()
defer w.mu.Unlock()
return w.recording
}
func NewWhisperBinary(logger *slog.Logger, cfg *config.Config) *WhisperBinary {
ctx, cancel := context.WithCancel(context.Background())
// Set ALSA error handler first
return &WhisperBinary{
logger: logger,
whisperPath: cfg.WhisperBinaryPath,
modelPath: cfg.WhisperModelPath,
lang: cfg.STT_LANG,
ctx: ctx,
cancel: cancel,
}
}
|
