144 lines
4.0 KiB
Go
144 lines
4.0 KiB
Go
package renderer
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import (
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"context"
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"fmt"
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)
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// Service controls Unreal Engine avatar rendering
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type Service interface {
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StartSession(ctx context.Context, sessionID string) error
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StopSession(ctx context.Context, sessionID string) error
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SendAnimationParams(ctx context.Context, sessionID string, params *AnimationParams) error
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GetVideoStream(ctx context.Context, sessionID string) (string, error) // Returns WebRTC stream URL
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}
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// AnimationParams contains animation parameters for the avatar
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type AnimationParams struct {
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Visemes []VisemeEvent
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Expressions *ExpressionParams
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Gestures []GestureEvent
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Gaze *GazeParams
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}
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// VisemeEvent represents a viseme (lip shape) event
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type VisemeEvent struct {
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Viseme string
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StartTime float64
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EndTime float64
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Intensity float64
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}
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// ExpressionParams contains facial expression parameters
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type ExpressionParams struct {
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Valence float64 // -1.0 to 1.0
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Arousal float64 // 0.0 to 1.0
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Emotion string // e.g., "happy", "neutral", "concerned"
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}
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// GestureEvent represents a gesture event
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type GestureEvent struct {
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Type string // e.g., "nod", "point", "wave"
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StartTime float64
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Duration float64
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Intensity float64
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}
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// GazeParams contains gaze/head tracking parameters
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type GazeParams struct {
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TargetX float64
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TargetY float64
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TargetZ float64
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}
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// PixelStreamingService implements avatar rendering using Unreal PixelStreaming
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type PixelStreamingService struct {
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unrealInstances map[string]*UnrealInstance
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}
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// UnrealInstance represents a running Unreal Engine instance
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type UnrealInstance struct {
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SessionID string
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ProcessID int
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StreamURL string
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Status string // "starting", "running", "stopping", "stopped"
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}
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// NewPixelStreamingService creates a new PixelStreaming service
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func NewPixelStreamingService() *PixelStreamingService {
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return &PixelStreamingService{
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unrealInstances: make(map[string]*UnrealInstance),
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}
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}
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// StartSession starts an Unreal instance for a session
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func (s *PixelStreamingService) StartSession(ctx context.Context, sessionID string) error {
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// TODO: Launch Unreal Engine with PixelStreaming enabled
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// This would involve:
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// 1. Starting Unreal Engine process with command-line args for PixelStreaming
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// 2. Configuring the instance for the session
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// 3. Getting the WebRTC stream URL
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// 4. Storing instance info
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instance := &UnrealInstance{
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SessionID: sessionID,
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Status: "starting",
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}
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s.unrealInstances[sessionID] = instance
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// Simulate instance startup
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instance.Status = "running"
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instance.StreamURL = fmt.Sprintf("ws://localhost:8888/stream/%s", sessionID)
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return nil
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}
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// StopSession stops an Unreal instance
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func (s *PixelStreamingService) StopSession(ctx context.Context, sessionID string) error {
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instance, ok := s.unrealInstances[sessionID]
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if !ok {
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return fmt.Errorf("instance not found for session: %s", sessionID)
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}
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instance.Status = "stopping"
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// TODO: Terminate Unreal Engine process
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instance.Status = "stopped"
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delete(s.unrealInstances, sessionID)
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return nil
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}
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// SendAnimationParams sends animation parameters to Unreal
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func (s *PixelStreamingService) SendAnimationParams(ctx context.Context, sessionID string, params *AnimationParams) error {
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instance, ok := s.unrealInstances[sessionID]
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if !ok {
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return fmt.Errorf("instance not found for session: %s", sessionID)
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}
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// TODO: Send parameters via WebSocket or HTTP to Unreal PixelStreaming plugin
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// This would involve:
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// 1. Serializing AnimationParams to JSON
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// 2. Sending to Unreal instance's control endpoint
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// 3. Unreal receives and applies to avatar
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_ = instance // Use instance
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return nil
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}
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// GetVideoStream returns the WebRTC stream URL for a session
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func (s *PixelStreamingService) GetVideoStream(ctx context.Context, sessionID string) (string, error) {
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instance, ok := s.unrealInstances[sessionID]
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if !ok {
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return "", fmt.Errorf("instance not found for session: %s", sessionID)
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}
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if instance.Status != "running" {
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return "", fmt.Errorf("instance not running for session: %s", sessionID)
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}
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return instance.StreamURL, nil
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}
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