feat(api): allow to pass videos to backends (#3601)

This prepares the API to receive videos as well for video understanding.

It works similarly to images, where the request should be in the form:

{
 "type": "video_url",
 "video_url": { "url": "url or base64 data" }
}

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

backend/backend.proto

@@ -134,6 +134,7 @@ message PredictOptions {
   repeated string Images = 42;
   bool UseTokenizerTemplate = 43;
   repeated Message Messages = 44;
+  repeated string Videos = 45;
 }
 
 // The response message containing the result

core/backend/llm.go

@@ -31,7 +31,7 @@ type TokenUsage struct {
 	Completion int
 }
 
-func ModelInference(ctx context.Context, s string, messages []schema.Message, images []string, loader *model.ModelLoader, c config.BackendConfig, o *config.ApplicationConfig, tokenCallback func(string, TokenUsage) bool) (func() (LLMResponse, error), error) {
+func ModelInference(ctx context.Context, s string, messages []schema.Message, images, videos []string, loader *model.ModelLoader, c config.BackendConfig, o *config.ApplicationConfig, tokenCallback func(string, TokenUsage) bool) (func() (LLMResponse, error), error) {
 	modelFile := c.Model
 	threads := c.Threads
 	if *threads == 0 && o.Threads != 0 {
@@ -101,6 +101,7 @@ func ModelInference(ctx context.Context, s string, messages []schema.Message, im
 		opts.Messages = protoMessages
 		opts.UseTokenizerTemplate = c.TemplateConfig.UseTokenizerTemplate
 		opts.Images = images
+		opts.Videos = videos
 
 		tokenUsage := TokenUsage{}
 

core/http/endpoints/openai/chat.go

@@ -640,8 +640,12 @@ func handleQuestion(config *config.BackendConfig, input *schema.OpenAIRequest, m
 	for _, m := range input.Messages {
 		images = append(images, m.StringImages...)
 	}
+	videos := []string{}
+	for _, m := range input.Messages {
+		videos = append(videos, m.StringVideos...)
+	}
 
-	predFunc, err := backend.ModelInference(input.Context, prompt, input.Messages, images, ml, *config, o, nil)
+	predFunc, err := backend.ModelInference(input.Context, prompt, input.Messages, images, videos, ml, *config, o, nil)
 	if err != nil {
 		log.Error().Err(err).Msg("model inference failed")
 		return "", err

core/http/endpoints/openai/inference.go

@@ -27,9 +27,13 @@ func ComputeChoices(
 	for _, m := range req.Messages {
 		images = append(images, m.StringImages...)
 	}
+	videos := []string{}
+	for _, m := range req.Messages {
+		videos = append(videos, m.StringVideos...)
+	}
 
 	// get the model function to call for the result
-	predFunc, err := backend.ModelInference(req.Context, predInput, req.Messages, images, loader, *config, o, tokenCallback)
+	predFunc, err := backend.ModelInference(req.Context, predInput, req.Messages, images, videos, loader, *config, o, tokenCallback)
 	if err != nil {
 		return result, backend.TokenUsage{}, err
 	}

core/http/endpoints/openai/request.go

@@ -135,7 +135,7 @@ func updateRequestConfig(config *config.BackendConfig, input *schema.OpenAIReque
 	}
 
 	// Decode each request's message content
-	index := 0
+	imgIndex, vidIndex := 0, 0
 	for i, m := range input.Messages {
 		switch content := m.Content.(type) {
 		case string:
@@ -144,20 +144,34 @@ func updateRequestConfig(config *config.BackendConfig, input *schema.OpenAIReque
 			dat, _ := json.Marshal(content)
 			c := []schema.Content{}
 			json.Unmarshal(dat, &c)
+		CONTENT:
 			for _, pp := range c {
-				if pp.Type == "text" {
+				switch pp.Type {
+				case "text":
 					input.Messages[i].StringContent = pp.Text
-				} else if pp.Type == "image_url" {
-					// Detect if pp.ImageURL is an URL, if it is download the image and encode it in base64:
-					base64, err := utils.GetImageURLAsBase64(pp.ImageURL.URL)
-					if err == nil {
-						input.Messages[i].StringImages = append(input.Messages[i].StringImages, base64) // TODO: make sure that we only return base64 stuff
-						// set a placeholder for each image
-						input.Messages[i].StringContent = fmt.Sprintf("[img-%d]", index) + input.Messages[i].StringContent
-						index++
-					} else {
-						log.Error().Msgf("Failed encoding image: %s", err)
+				case "video", "video_url":
+					// Decode content as base64 either if it's an URL or base64 text
+					base64, err := utils.GetContentURIAsBase64(pp.VideoURL.URL)
+					if err != nil {
+						log.Error().Msgf("Failed encoding video: %s", err)
+						continue CONTENT
 					}
+					input.Messages[i].StringVideos = append(input.Messages[i].StringVideos, base64) // TODO: make sure that we only return base64 stuff
+					// set a placeholder for each image
+					input.Messages[i].StringContent = fmt.Sprintf("[vid-%d]", vidIndex) + input.Messages[i].StringContent
+					vidIndex++
+				case "image_url", "image":
+					// Decode content as base64 either if it's an URL or base64 text
+
+					base64, err := utils.GetContentURIAsBase64(pp.ImageURL.URL)
+					if err != nil {
+						log.Error().Msgf("Failed encoding image: %s", err)
+						continue CONTENT
+					}
+					input.Messages[i].StringImages = append(input.Messages[i].StringImages, base64) // TODO: make sure that we only return base64 stuff
+					// set a placeholder for each image
+					input.Messages[i].StringContent = fmt.Sprintf("[img-%d]", imgIndex) + input.Messages[i].StringContent
+					imgIndex++
 				}
 			}
 		}

core/schema/openai.go

@@ -58,6 +58,7 @@ type Content struct {
 	Type     string     `json:"type" yaml:"type"`
 	Text     string     `json:"text" yaml:"text"`
 	ImageURL ContentURL `json:"image_url" yaml:"image_url"`
+	VideoURL ContentURL `json:"video_url" yaml:"video_url"`
 }
 
 type ContentURL struct {
@@ -76,6 +77,7 @@ type Message struct {
 
 	StringContent string   `json:"string_content,omitempty" yaml:"string_content,omitempty"`
 	StringImages  []string `json:"string_images,omitempty" yaml:"string_images,omitempty"`
+	StringVideos  []string `json:"string_videos,omitempty" yaml:"string_videos,omitempty"`
 
 	// A result of a function call
 	FunctionCall interface{} `json:"function_call,omitempty" yaml:"function_call,omitempty"`

pkg/utils/base64.go

@@ -13,14 +13,8 @@ var base64DownloadClient http.Client = http.Client{
 	Timeout: 30 * time.Second,
 }
 
-// this function check if the string is an URL, if it's an URL downloads the image in memory
-// encodes it in base64 and returns the base64 string
-
-// This may look weird down in pkg/utils while it is currently only used in core/config
-//
-//	but I believe it may be useful for MQTT as well in the near future, so I'm
-//	extracting it while I'm thinking of it.
-func GetImageURLAsBase64(s string) (string, error) {
+// GetContentURIAsBase64 checks if the string is an URL, if it's an URL downloads the content in memory encodes it in base64 and returns the base64 string, otherwise returns the string by stripping base64 data headers
+func GetContentURIAsBase64(s string) (string, error) {
 	if strings.HasPrefix(s, "http") {
 		// download the image
 		resp, err := base64DownloadClient.Get(s)

pkg/utils/base64_test.go

@@ -10,20 +10,20 @@ var _ = Describe("utils/base64 tests", func() {
 	It("GetImageURLAsBase64 can strip jpeg data url prefixes", func() {
 		// This one doesn't actually _care_ that it's base64, so feed "bad" data in this test in order to catch a change in that behavior for informational purposes.
 		input := "data:image/jpeg;base64,FOO"
-		b64, err := GetImageURLAsBase64(input)
+		b64, err := GetContentURIAsBase64(input)
 		Expect(err).To(BeNil())
 		Expect(b64).To(Equal("FOO"))
 	})
 	It("GetImageURLAsBase64 can strip png data url prefixes", func() {
 		// This one doesn't actually _care_ that it's base64, so feed "bad" data in this test in order to catch a change in that behavior for informational purposes.
 		input := "data:image/png;base64,BAR"
-		b64, err := GetImageURLAsBase64(input)
+		b64, err := GetContentURIAsBase64(input)
 		Expect(err).To(BeNil())
 		Expect(b64).To(Equal("BAR"))
 	})
 	It("GetImageURLAsBase64 returns an error for bogus data", func() {
 		input := "FOO"
-		b64, err := GetImageURLAsBase64(input)
+		b64, err := GetContentURIAsBase64(input)
 		Expect(b64).To(Equal(""))
 		Expect(err).ToNot(BeNil())
 		Expect(err).To(MatchError("not valid string"))
@@ -31,7 +31,7 @@ var _ = Describe("utils/base64 tests", func() {
 	It("GetImageURLAsBase64 can actually download images and calculates something", func() {
 		// This test doesn't actually _check_ the results at this time, which is bad, but there wasn't a test at all before...
 		input := "https://upload.wikimedia.org/wikipedia/en/2/29/Wargames.jpg"
-		b64, err := GetImageURLAsBase64(input)
+		b64, err := GetContentURIAsBase64(input)
 		Expect(err).To(BeNil())
 		Expect(b64).ToNot(BeNil())
 	})