1 files changed, 24 insertions, 0 deletions
diff --git a/internal/config/provider.go b/internal/config/provider.go
new file mode 100644
index 0000000..7044964
--- /dev/null
+++ b/internal/config/provider.go
@@ -0,0 +1,24 @@
+package config
+
+import "strings"
+
+const (
+	// ProviderGemini is the canonical name for the Google Gemini provider.
+	// It is the default across all subsystems (audio, translation, phonetic).
+	ProviderGemini = "gemini"
+
+	// ProviderOpenAI is the canonical name for the OpenAI provider.
+	ProviderOpenAI = "openai"
+)
+
+// NormalizeProvider returns a canonical, lowercase provider name.
+// An empty input resolves to ProviderGemini (the default). The function is
+// shared by the audio, translation, and phonetic packages so the same
+// normalization rule has a single authoritative home.
+func NormalizeProvider(provider string) string {
+	normalized := strings.ToLower(strings.TrimSpace(provider))
+	if normalized == "" {
+		return ProviderGemini
+	}
+	return normalized
+}