refactor: move convertToWAV to shared audio_utils.go

internal/transcriber/adapter_groq_transcription.go

@@ -3,7 +3,6 @@ package transcriber
 import (
 	"bytes"
 	"context"
-	"encoding/binary"
 	"fmt"
 	"log"
 	"time"
@@ -59,39 +58,3 @@ func (a *GroqTranscriptionAdapter) Transcribe(ctx context.Context, audioData []b
 	log.Printf("groq-transcription-adapter: transcribed %d bytes in %v: %q", len(audioData), duration, resp.Text)
 	return resp.Text, nil
 }
-
-// convertToWAV converts raw 16-bit PCM audio to WAV format
-func convertToWAV(rawAudio []byte) ([]byte, error) {
-	var buf bytes.Buffer
-
-	const sampleRate = 16000
-	const channels = 1
-	const bitsPerSample = 16
-	const byteRate = sampleRate * channels * bitsPerSample / 8
-	const blockAlign = channels * bitsPerSample / 8
-
-	dataSize := len(rawAudio)
-	fileSize := 36 + dataSize
-
-	// WAV header
-	buf.WriteString("RIFF")
-	binary.Write(&buf, binary.LittleEndian, uint32(fileSize))
-	buf.WriteString("WAVE")
-
-	// fmt chunk
-	buf.WriteString("fmt ")
-	binary.Write(&buf, binary.LittleEndian, uint32(16))            // fmt chunk size
-	binary.Write(&buf, binary.LittleEndian, uint16(1))             // PCM format
-	binary.Write(&buf, binary.LittleEndian, uint16(channels))      // number of channels
-	binary.Write(&buf, binary.LittleEndian, uint32(sampleRate))    // sample rate
-	binary.Write(&buf, binary.LittleEndian, uint32(byteRate))      // byte rate
-	binary.Write(&buf, binary.LittleEndian, uint16(blockAlign))    // block align
-	binary.Write(&buf, binary.LittleEndian, uint16(bitsPerSample)) // bits per sample
-
-	// data chunk
-	buf.WriteString("data")
-	binary.Write(&buf, binary.LittleEndian, uint32(dataSize))
-	buf.Write(rawAudio)
-
-	return buf.Bytes(), nil
-}

internal/transcriber/audio_utils.go

@@ -0,0 +1,42 @@
+package transcriber
+
+import (
+	"bytes"
+	"encoding/binary"
+)
+
+// convertToWAV converts raw 16-bit PCM audio to WAV format
+func convertToWAV(rawAudio []byte) ([]byte, error) {
+	var buf bytes.Buffer
+
+	const sampleRate = 16000
+	const channels = 1
+	const bitsPerSample = 16
+	const byteRate = sampleRate * channels * bitsPerSample / 8
+	const blockAlign = channels * bitsPerSample / 8
+
+	dataSize := len(rawAudio)
+	fileSize := 36 + dataSize
+
+	// WAV header
+	buf.WriteString("RIFF")
+	binary.Write(&buf, binary.LittleEndian, uint32(fileSize))
+	buf.WriteString("WAVE")
+
+	// fmt chunk
+	buf.WriteString("fmt ")
+	binary.Write(&buf, binary.LittleEndian, uint32(16))            // fmt chunk size
+	binary.Write(&buf, binary.LittleEndian, uint16(1))             // PCM format
+	binary.Write(&buf, binary.LittleEndian, uint16(channels))      // number of channels
+	binary.Write(&buf, binary.LittleEndian, uint32(sampleRate))    // sample rate
+	binary.Write(&buf, binary.LittleEndian, uint32(byteRate))      // byte rate
+	binary.Write(&buf, binary.LittleEndian, uint16(blockAlign))    // block align
+	binary.Write(&buf, binary.LittleEndian, uint16(bitsPerSample)) // bits per sample
+
+	// data chunk
+	buf.WriteString("data")
+	binary.Write(&buf, binary.LittleEndian, uint32(dataSize))
+	buf.Write(rawAudio)
+
+	return buf.Bytes(), nil
+}