347 lines
9.7 KiB
Go
347 lines
9.7 KiB
Go
package extra
|
|
|
|
import (
|
|
"bytes"
|
|
"context"
|
|
"errors"
|
|
"fmt"
|
|
"gf-lt/config"
|
|
"io"
|
|
"log/slog"
|
|
"os"
|
|
"os/exec"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/gordonklaus/portaudio"
|
|
)
|
|
|
|
type WhisperBinary struct {
|
|
logger *slog.Logger
|
|
whisperPath string
|
|
modelPath string
|
|
lang string
|
|
ctx context.Context
|
|
cancel context.CancelFunc
|
|
mu sync.Mutex
|
|
recording bool
|
|
audioBuffer []int16
|
|
}
|
|
|
|
func NewWhisperBinary(logger *slog.Logger, cfg *config.Config) *WhisperBinary {
|
|
ctx, cancel := context.WithCancel(context.Background())
|
|
return &WhisperBinary{
|
|
logger: logger,
|
|
whisperPath: cfg.WhisperBinaryPath,
|
|
modelPath: cfg.WhisperModelPath,
|
|
lang: cfg.STT_LANG,
|
|
ctx: ctx,
|
|
cancel: cancel,
|
|
}
|
|
}
|
|
|
|
func (w *WhisperBinary) StartRecording() error {
|
|
w.mu.Lock()
|
|
defer w.mu.Unlock()
|
|
if w.recording {
|
|
return errors.New("recording is already in progress")
|
|
}
|
|
|
|
// Suppress ALSA warnings by setting environment variables
|
|
origCard := os.Getenv("ALSA_PCM_CARD")
|
|
origDevice := os.Getenv("ALSA_PCM_DEVICE")
|
|
origSubdevice := os.Getenv("ALSA_PCM_SUBDEVICE")
|
|
|
|
// Set specific ALSA device to prevent "Unknown PCM card.pcm.rear" warnings
|
|
os.Setenv("ALSA_PCM_CARD", "0")
|
|
os.Setenv("ALSA_PCM_DEVICE", "0")
|
|
os.Setenv("ALSA_PCM_SUBDEVICE", "0")
|
|
|
|
if err := portaudio.Initialize(); err != nil {
|
|
// Restore original environment variables on error
|
|
if origCard != "" {
|
|
os.Setenv("ALSA_PCM_CARD", origCard)
|
|
} else {
|
|
os.Unsetenv("ALSA_PCM_CARD")
|
|
}
|
|
if origDevice != "" {
|
|
os.Setenv("ALSA_PCM_DEVICE", origDevice)
|
|
} else {
|
|
os.Unsetenv("ALSA_PCM_DEVICE")
|
|
}
|
|
if origSubdevice != "" {
|
|
os.Setenv("ALSA_PCM_SUBDEVICE", origSubdevice)
|
|
} else {
|
|
os.Unsetenv("ALSA_PCM_SUBDEVICE")
|
|
}
|
|
return fmt.Errorf("portaudio init failed: %w", err)
|
|
}
|
|
|
|
// Restore original environment variables after initialization
|
|
if origCard != "" {
|
|
os.Setenv("ALSA_PCM_CARD", origCard)
|
|
} else {
|
|
os.Unsetenv("ALSA_PCM_CARD")
|
|
}
|
|
if origDevice != "" {
|
|
os.Setenv("ALSA_PCM_DEVICE", origDevice)
|
|
} else {
|
|
os.Unsetenv("ALSA_PCM_DEVICE")
|
|
}
|
|
if origSubdevice != "" {
|
|
os.Setenv("ALSA_PCM_SUBDEVICE", origSubdevice)
|
|
} else {
|
|
os.Unsetenv("ALSA_PCM_SUBDEVICE")
|
|
}
|
|
|
|
// Initialize audio buffer
|
|
w.audioBuffer = make([]int16, 0)
|
|
in := make([]int16, 1024) // buffer size
|
|
stream, err := portaudio.OpenDefaultStream(1, 0, 16000.0, len(in), in)
|
|
if err != nil {
|
|
if paErr := portaudio.Terminate(); paErr != nil {
|
|
return fmt.Errorf("failed to open microphone: %w; terminate error: %w", err, paErr)
|
|
}
|
|
return fmt.Errorf("failed to open microphone: %w", err)
|
|
}
|
|
|
|
go w.recordAudio(stream, in)
|
|
w.recording = true
|
|
w.logger.Debug("Recording started")
|
|
return nil
|
|
}
|
|
|
|
func (w *WhisperBinary) recordAudio(stream *portaudio.Stream, in []int16) {
|
|
defer func() {
|
|
w.logger.Debug("recordAudio defer function called")
|
|
_ = stream.Stop() // Stop the stream
|
|
_ = portaudio.Terminate() // ignoring error as we're shutting down
|
|
w.logger.Debug("recordAudio terminated")
|
|
}()
|
|
w.logger.Debug("Starting audio stream")
|
|
if err := stream.Start(); err != nil {
|
|
w.logger.Error("Failed to start audio stream", "error", err)
|
|
return
|
|
}
|
|
w.logger.Debug("Audio stream started, entering recording loop")
|
|
for {
|
|
select {
|
|
case <-w.ctx.Done():
|
|
w.logger.Debug("Context done, exiting recording loop")
|
|
return
|
|
default:
|
|
// Check recording status with minimal lock time
|
|
w.mu.Lock()
|
|
recording := w.recording
|
|
w.mu.Unlock()
|
|
|
|
if !recording {
|
|
w.logger.Debug("Recording flag is false, exiting recording loop")
|
|
return
|
|
}
|
|
if err := stream.Read(); err != nil {
|
|
w.logger.Error("Error reading from stream", "error", err)
|
|
return
|
|
}
|
|
// Append samples to buffer - only acquire lock when necessary
|
|
w.mu.Lock()
|
|
if w.audioBuffer == nil {
|
|
w.audioBuffer = make([]int16, 0)
|
|
}
|
|
// Make a copy of the input buffer to avoid overwriting
|
|
tempBuffer := make([]int16, len(in))
|
|
copy(tempBuffer, in)
|
|
w.audioBuffer = append(w.audioBuffer, tempBuffer...)
|
|
w.mu.Unlock()
|
|
}
|
|
}
|
|
}
|
|
|
|
func (w *WhisperBinary) StopRecording() (string, error) {
|
|
w.logger.Debug("StopRecording called")
|
|
w.mu.Lock()
|
|
if !w.recording {
|
|
w.mu.Unlock()
|
|
return "", errors.New("not currently recording")
|
|
}
|
|
w.logger.Debug("Setting recording to false and cancelling context")
|
|
w.recording = false
|
|
w.cancel() // This will stop the recording goroutine
|
|
w.mu.Unlock()
|
|
|
|
// Small delay to allow the recording goroutine to react to context cancellation
|
|
time.Sleep(100 * time.Millisecond)
|
|
|
|
// Save the recorded audio to a temporary file
|
|
tempFile, err := w.saveAudioToTempFile()
|
|
if err != nil {
|
|
w.logger.Error("Error saving audio to temp file", "error", err)
|
|
return "", fmt.Errorf("failed to save audio to temp file: %w", err)
|
|
}
|
|
w.logger.Debug("Saved audio to temp file", "file", tempFile)
|
|
|
|
// Run the whisper binary with a separate context to avoid cancellation during transcription
|
|
cmd := exec.Command(w.whisperPath, "-m", w.modelPath, "-l", w.lang, tempFile, "2>/dev/null")
|
|
var outBuf bytes.Buffer
|
|
cmd.Stdout = &outBuf
|
|
// Redirect stderr to suppress ALSA warnings and other stderr output
|
|
cmd.Stderr = io.Discard // Suppress stderr output from whisper binary
|
|
|
|
w.logger.Debug("Running whisper binary command")
|
|
if err := cmd.Run(); err != nil {
|
|
// Clean up audio buffer
|
|
w.mu.Lock()
|
|
w.audioBuffer = nil
|
|
w.mu.Unlock()
|
|
// Since we're suppressing stderr, we'll just log that the command failed
|
|
w.logger.Error("Error running whisper binary", "error", err)
|
|
return "", fmt.Errorf("whisper binary failed: %w", err)
|
|
}
|
|
result := outBuf.String()
|
|
w.logger.Debug("Whisper binary completed", "result", result)
|
|
|
|
// Clean up audio buffer
|
|
w.mu.Lock()
|
|
w.audioBuffer = nil
|
|
w.mu.Unlock()
|
|
|
|
// Clean up the temporary file after transcription
|
|
w.logger.Debug("StopRecording completed")
|
|
os.Remove(tempFile)
|
|
|
|
return result, nil
|
|
}
|
|
|
|
// saveAudioToTempFile saves the recorded audio data to a temporary WAV file
|
|
func (w *WhisperBinary) saveAudioToTempFile() (string, error) {
|
|
w.logger.Debug("saveAudioToTempFile called")
|
|
// Create temporary WAV file
|
|
tempFile, err := os.CreateTemp("", "recording_*.wav")
|
|
if err != nil {
|
|
w.logger.Error("Failed to create temp file", "error", err)
|
|
return "", fmt.Errorf("failed to create temp file: %w", err)
|
|
}
|
|
w.logger.Debug("Created temp file", "file", tempFile.Name())
|
|
defer tempFile.Close()
|
|
|
|
// Write WAV header and data
|
|
w.logger.Debug("About to write WAV file", "file", tempFile.Name())
|
|
err = w.writeWAVFile(tempFile.Name())
|
|
if err != nil {
|
|
w.logger.Error("Error writing WAV file", "error", err)
|
|
return "", fmt.Errorf("failed to write WAV file: %w", err)
|
|
}
|
|
w.logger.Debug("WAV file written successfully", "file", tempFile.Name())
|
|
|
|
return tempFile.Name(), nil
|
|
}
|
|
|
|
// writeWAVFile creates a WAV file from the recorded audio data
|
|
func (w *WhisperBinary) writeWAVFile(filename string) error {
|
|
w.logger.Debug("writeWAVFile called", "filename", filename)
|
|
// Open file for writing
|
|
file, err := os.Create(filename)
|
|
if err != nil {
|
|
w.logger.Error("Error creating file", "error", err)
|
|
return err
|
|
}
|
|
defer file.Close()
|
|
|
|
w.logger.Debug("About to acquire mutex in writeWAVFile")
|
|
w.mu.Lock()
|
|
w.logger.Debug("Locked mutex, copying audio buffer")
|
|
audioData := make([]int16, len(w.audioBuffer))
|
|
copy(audioData, w.audioBuffer)
|
|
w.mu.Unlock()
|
|
w.logger.Debug("Unlocked mutex", "audio_data_length", len(audioData))
|
|
|
|
if len(audioData) == 0 {
|
|
w.logger.Warn("No audio data to write")
|
|
return errors.New("no audio data to write")
|
|
}
|
|
|
|
// Calculate data size (number of samples * size of int16)
|
|
dataSize := len(audioData) * 2 // 2 bytes per int16 sample
|
|
w.logger.Debug("Calculated data size", "size", dataSize)
|
|
|
|
// Write WAV header with the correct data size
|
|
header := w.createWAVHeader(16000, 1, 16, dataSize)
|
|
_, err = file.Write(header)
|
|
if err != nil {
|
|
w.logger.Error("Error writing WAV header", "error", err)
|
|
return err
|
|
}
|
|
w.logger.Debug("WAV header written successfully")
|
|
|
|
// Write audio data
|
|
w.logger.Debug("About to write audio data samples")
|
|
for i, sample := range audioData {
|
|
// Write little-endian 16-bit sample
|
|
_, err := file.Write([]byte{byte(sample), byte(sample >> 8)})
|
|
if err != nil {
|
|
w.logger.Error("Error writing sample", "index", i, "error", err)
|
|
return err
|
|
}
|
|
// Log progress every 10000 samples to avoid too much output
|
|
if i%10000 == 0 {
|
|
w.logger.Debug("Written samples", "count", i)
|
|
}
|
|
}
|
|
w.logger.Debug("All audio data written successfully")
|
|
|
|
return nil
|
|
}
|
|
|
|
// createWAVHeader creates a WAV file header
|
|
func (w *WhisperBinary) createWAVHeader(sampleRate, channels, bitsPerSample int, dataSize int) []byte {
|
|
header := make([]byte, 44)
|
|
copy(header[0:4], "RIFF")
|
|
// Total file size will be updated later
|
|
copy(header[8:12], "WAVE")
|
|
copy(header[12:16], "fmt ")
|
|
// fmt chunk size (16 for PCM)
|
|
header[16] = 16
|
|
header[17] = 0
|
|
header[18] = 0
|
|
header[19] = 0
|
|
// Audio format (1 = PCM)
|
|
header[20] = 1
|
|
header[21] = 0
|
|
// Number of channels
|
|
header[22] = byte(channels)
|
|
header[23] = 0
|
|
// Sample rate
|
|
header[24] = byte(sampleRate)
|
|
header[25] = byte(sampleRate >> 8)
|
|
header[26] = byte(sampleRate >> 16)
|
|
header[27] = byte(sampleRate >> 24)
|
|
// Byte rate
|
|
byteRate := sampleRate * channels * bitsPerSample / 8
|
|
header[28] = byte(byteRate)
|
|
header[29] = byte(byteRate >> 8)
|
|
header[30] = byte(byteRate >> 16)
|
|
header[31] = byte(byteRate >> 24)
|
|
// Block align
|
|
blockAlign := channels * bitsPerSample / 8
|
|
header[32] = byte(blockAlign)
|
|
header[33] = 0
|
|
// Bits per sample
|
|
header[34] = byte(bitsPerSample)
|
|
header[35] = 0
|
|
// "data" subchunk
|
|
copy(header[36:40], "data")
|
|
// Data size
|
|
header[40] = byte(dataSize)
|
|
header[41] = byte(dataSize >> 8)
|
|
header[42] = byte(dataSize >> 16)
|
|
header[43] = byte(dataSize >> 24)
|
|
|
|
return header
|
|
}
|
|
|
|
func (w *WhisperBinary) IsRecording() bool {
|
|
w.mu.Lock()
|
|
defer w.mu.Unlock()
|
|
return w.recording
|
|
}
|