Switch transcription to Whisper large v3

internal/transcription/client.go

@@ -19,16 +19,19 @@ type Client struct {
 	http     *http.Client
 }
 
-const ProviderVoxtral = "voxtral-small"
+const (
+	ProviderWhisperLargeV3 = "whisper-large-v3"
+	defaultWhisperModel    = "openai/whisper-large-v3"
+)
 
 var speakerLabelPattern = regexp.MustCompile(`(?i)(?:^|[\n\r ]+)((?:speaker|спикер|говорящий)\s*\d+)\s*[:：-]`)
 
 type Options struct {
-	VoxtralBaseURL string
-	VoxtralAPIKey  string
-	VoxtralModel   string
-	VoxtralTimeout time.Duration
-	AudioLLMPrompt string
+	AudioBaseURL string
+	AudioAPIKey  string
+	AudioModel   string
+	AudioTimeout time.Duration
+	AudioPrompt  string
 }
 
 type ProviderConfig struct {
@@ -102,17 +105,17 @@ type audioTranscriptionSegment struct {
 
 func New(baseURL string, timeout time.Duration, ffmpegPath string, leadSilence time.Duration) *Client {
 	return NewWithOptions(Options{
-		VoxtralBaseURL: baseURL,
-		VoxtralTimeout: timeout,
+		AudioBaseURL: baseURL,
+		AudioTimeout: timeout,
 	})
 }
 
 func NewWithOptions(opts Options) *Client {
-	audioLLMPrompt := strings.TrimSpace(opts.AudioLLMPrompt)
-	if audioLLMPrompt == "" {
-		audioLLMPrompt = "Transcribe the audio exactly. Return only the transcript text."
+	audioPrompt := strings.TrimSpace(opts.AudioPrompt)
+	if audioPrompt == "" {
+		audioPrompt = "Transcribe the audio exactly. Return only the transcript text."
 	}
-	provider := buildVoxtralProvider(opts, audioLLMPrompt)
+	provider := buildAudioProvider(opts, audioPrompt)
 	if provider.BaseURL == "" {
 		return nil
 	}
@@ -122,18 +125,18 @@ func NewWithOptions(opts Options) *Client {
 	}
 }
 
-func buildVoxtralProvider(opts Options, prompt string) ProviderConfig {
-	baseURL := strings.TrimRight(strings.TrimSpace(opts.VoxtralBaseURL), "/")
+func buildAudioProvider(opts Options, prompt string) ProviderConfig {
+	baseURL := strings.TrimRight(strings.TrimSpace(opts.AudioBaseURL), "/")
 	if baseURL == "" {
 		return ProviderConfig{}
 	}
-	model := firstNonEmpty(opts.VoxtralModel, "mistralai/Voxtral-Small-24B-2507")
+	model := firstNonEmpty(opts.AudioModel, defaultWhisperModel)
 	return ProviderConfig{
-		Name:    ProviderVoxtral,
+		Name:    ProviderWhisperLargeV3,
 		BaseURL: baseURL,
-		APIKey:  strings.TrimSpace(opts.VoxtralAPIKey),
+		APIKey:  strings.TrimSpace(opts.AudioAPIKey),
 		Model:   model,
-		Timeout: defaultDuration(opts.VoxtralTimeout, 10*time.Minute),
+		Timeout: defaultDuration(opts.AudioTimeout, 10*time.Minute),
 		Prompt:  prompt,
 	}
 }
@@ -147,7 +150,7 @@ func defaultDuration(v, fallback time.Duration) time.Duration {
 
 func (c *Client) Transcribe(ctx context.Context, in Input) (*Result, error) {
 	if c == nil || c.provider.BaseURL == "" {
-		return nil, fmt.Errorf("voxtral transcription provider not configured")
+		return nil, fmt.Errorf("audio transcription provider not configured")
 	}
 	if strings.TrimSpace(in.AudioURL) == "" {
 		return nil, fmt.Errorf("audio_url is required")