feat: elevenlabs sound-generation api (#3355)

* initial version of elevenlabs compatible soundgeneration api and cli command

Signed-off-by: Dave Lee <dave@gray101.com>

* minor cleanup

Signed-off-by: Dave Lee <dave@gray101.com>

* restore TTS, add test

Signed-off-by: Dave Lee <dave@gray101.com>

* remove stray s

Signed-off-by: Dave Lee <dave@gray101.com>

* fix

Signed-off-by: Dave Lee <dave@gray101.com>

---------

Signed-off-by: Dave Lee <dave@gray101.com>
Signed-off-by: Ettore Di Giacinto <mudler@users.noreply.github.com>
Co-authored-by: Ettore Di Giacinto <mudler@users.noreply.github.com>

core/backend/soundgeneration.go

@@ -0,0 +1,74 @@
+package backend
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/mudler/LocalAI/core/config"
+	"github.com/mudler/LocalAI/pkg/grpc/proto"
+	"github.com/mudler/LocalAI/pkg/model"
+	"github.com/mudler/LocalAI/pkg/utils"
+)
+
+func SoundGeneration(
+	backend string,
+	modelFile string,
+	text string,
+	duration *float32,
+	temperature *float32,
+	doSample *bool,
+	sourceFile *string,
+	sourceDivisor *int32,
+	loader *model.ModelLoader,
+	appConfig *config.ApplicationConfig,
+	backendConfig config.BackendConfig,
+) (string, *proto.Result, error) {
+	if backend == "" {
+		return "", nil, fmt.Errorf("backend is a required parameter")
+	}
+
+	grpcOpts := gRPCModelOpts(backendConfig)
+	opts := modelOpts(config.BackendConfig{}, appConfig, []model.Option{
+		model.WithBackendString(backend),
+		model.WithModel(modelFile),
+		model.WithContext(appConfig.Context),
+		model.WithAssetDir(appConfig.AssetsDestination),
+		model.WithLoadGRPCLoadModelOpts(grpcOpts),
+	})
+
+	soundGenModel, err := loader.BackendLoader(opts...)
+	if err != nil {
+		return "", nil, err
+	}
+
+	if soundGenModel == nil {
+		return "", nil, fmt.Errorf("could not load sound generation model")
+	}
+
+	if err := os.MkdirAll(appConfig.AudioDir, 0750); err != nil {
+		return "", nil, fmt.Errorf("failed creating audio directory: %s", err)
+	}
+
+	fileName := utils.GenerateUniqueFileName(appConfig.AudioDir, "sound_generation", ".wav")
+	filePath := filepath.Join(appConfig.AudioDir, fileName)
+
+	res, err := soundGenModel.SoundGeneration(context.Background(), &proto.SoundGenerationRequest{
+		Text:        text,
+		Model:       modelFile,
+		Dst:         filePath,
+		Sample:      doSample,
+		Duration:    duration,
+		Temperature: temperature,
+		Src:         sourceFile,
+		SrcDivisor:  sourceDivisor,
+	})
+
+	// return RPC error if any
+	if !res.Success {
+		return "", nil, fmt.Errorf(res.Message)
+	}
+
+	return filePath, res, err
+}