feat: split piper from main binary (#5858)

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

core/backend/tts.go

@@ -21,7 +21,7 @@ func ModelTTS(
 	appConfig *config.ApplicationConfig,
 	backendConfig config.BackendConfig,
 ) (string, *proto.Result, error) {
-	opts := ModelOptions(backendConfig, appConfig, model.WithDefaultBackendString(model.PiperBackend))
+	opts := ModelOptions(backendConfig, appConfig)
 	ttsModel, err := loader.Load(opts...)
 	if err != nil {
 		return "", nil, err

core/http/app_test.go

@@ -532,10 +532,6 @@ var _ = Describe("API test", func() {
 			c, cancel = context.WithCancel(context.Background())
 
 			galleries := []config.Gallery{
-				{
-					Name: "model-gallery",
-					URL:  "https://raw.githubusercontent.com/go-skynet/model-gallery/main/index.yaml",
-				},
 				{
 					Name: "localai",
 					URL:  "https://raw.githubusercontent.com/mudler/LocalAI/refs/heads/master/gallery/index.yaml",
@@ -665,7 +661,7 @@ var _ = Describe("API test", func() {
 			}
 
 			response := postModelApplyRequest("http://127.0.0.1:9090/models/apply", modelApplyRequest{
-				ID: "model-gallery@voice-en-us-kathleen-low",
+				ID: "localai@voice-en-us-kathleen-low",
 			})
 
 			Expect(response["uuid"]).ToNot(BeEmpty(), fmt.Sprint(response))
@@ -679,7 +675,7 @@ var _ = Describe("API test", func() {
 			}, "360s", "10s").Should(Equal(true))
 
 			// An HTTP Post to the /tts endpoint should return a wav audio file
-			resp, err := http.Post("http://127.0.0.1:9090/tts", "application/json", bytes.NewBuffer([]byte(`{"input": "Hello world", "model": "en-us-kathleen-low.onnx"}`)))
+			resp, err := http.Post("http://127.0.0.1:9090/tts", "application/json", bytes.NewBuffer([]byte(`{"input": "Hello world", "model": "voice-en-us-kathleen-low"}`)))
 			Expect(err).ToNot(HaveOccurred(), fmt.Sprint(resp))
 			dat, err := io.ReadAll(resp.Body)
 			Expect(err).ToNot(HaveOccurred(), fmt.Sprint(resp))

core/http/endpoints/localai/tts.go

@@ -36,12 +36,8 @@ func TTSEndpoint(cl *config.BackendConfigLoader, ml *model.ModelLoader, appConfi
 
 		log.Debug().Str("model", input.Model).Msg("LocalAI TTS Request received")
 
-		if cfg.Backend == "" {
-			if input.Backend != "" {
-				cfg.Backend = input.Backend
-			} else {
-				cfg.Backend = model.PiperBackend
-			}
+		if cfg.Backend == "" && input.Backend != "" {
+			cfg.Backend = input.Backend
 		}
 
 		if input.Language != "" {