update to add test code

client/client.go

@@ -1,6 +1,8 @@
 package client
 
-import "errors"
+import (
+	"errors"
+)
 
 const apiEndpoint = "https://api.elevenlabs.io"
 

client/tts.go

@@ -14,6 +14,7 @@ import (
 )
 
 func (c Client) TTSWriter(ctx context.Context, w io.Writer, text, voiceID string, options types.SynthesisOptions) error {
+	options.Clamp()
 	url := fmt.Sprintf(c.endpoint+"/v1/text-to-speech/%s", voiceID)
 	opts := types.TTS{
 		Text:          text,
@@ -55,7 +56,8 @@ func (c Client) TTSWriter(ctx context.Context, w io.Writer, text, voiceID string
 	}
 }
 
-func (c Client) TTS(ctx context.Context, w io.Writer, text, voiceID string, options types.SynthesisOptions) ([]byte, error) {
+func (c Client) TTS(ctx context.Context, text, voiceID string, options types.SynthesisOptions) ([]byte, error) {
+	options.Clamp()
 	url := fmt.Sprintf(c.endpoint+"/v1/text-to-speech/%s", voiceID)
 	client := &http.Client{}
 	opts := types.TTS{
@@ -101,6 +103,7 @@ func (c Client) TTS(ctx context.Context, w io.Writer, text, voiceID string, opti
 }
 
 func (c Client) TTSStream(ctx context.Context, w io.Writer, text, voiceID string, options types.SynthesisOptions) error {
+	options.Clamp()
 	url := fmt.Sprintf(c.endpoint+"/v1/text-to-speech/%s/stream", voiceID)
 	opts := types.TTS{
 		Text:          text,

client/types/types.go

@@ -23,6 +23,15 @@ type TTS struct {
 	VoiceSettings SynthesisOptions `json:"voice_settings,omitempty"` // Voice settings are applied only on the given TTS request.
 }
 
+func (so *SynthesisOptions) Clamp() {
+	if so.Stability > 1 || so.Stability < 0 {
+		so.Stability = 0.75
+	}
+	if so.SimilarityBoost > 1 || so.SimilarityBoost < 0 {
+		so.SimilarityBoost = 0.75
+	}
+}
+
 type SynthesisOptions struct {
 	Stability       float64 `json:"stability"`
 	SimilarityBoost float64 `json:"similarity_boost"`