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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 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527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 | import { eq } from 'drizzle-orm' import { createId } from '@paralleldrive/cuid2' import { mkdir, writeFile, rm } from 'fs/promises' import path from 'path' import { db } from '@/db' import { visionProblemVideos, type VisionProblemVideoStatus, type NewVisionProblemVideo, } from '@/db/schema/vision-problem-videos' import { VideoEncoder } from './VideoEncoder' /** * Frame data received from vision-frame socket events */ export interface VisionFrame { sessionId: string imageData: string // base64 JPEG detectedValue: number | null confidence: number timestamp: number // Unix timestamp in ms } /** * Problem marker data (without offsetMs, which is calculated) */ export interface ProblemMarkerInput { problemNumber: number partIndex: number eventType: 'problem-shown' | 'answer-submitted' | 'feedback-shown' isCorrect?: boolean /** Epoch number: 0 = initial pass, 1-2 = retry epochs */ epochNumber: number /** Attempt number within the epoch (1-indexed) */ attemptNumber: number /** Whether this is a retry (epoch > 0) */ isRetry: boolean /** Whether this is a manual redo (student clicked on completed problem) */ isManualRedo: boolean /** Unique slot ID tying this recording to the specific problem slot (same ID used in answer validation) */ slotId: string /** Problem data sent with 'problem-shown' markers (avoids relying on stale practice state) */ problem?: { terms: number[]; answer: number } } /** * Practice state data for metadata capture */ export interface PracticeStateInput { currentProblem: { terms: number[]; answer: number } phase: 'problem' | 'feedback' | 'tutorial' studentAnswer: string isCorrect: boolean | null currentProblemNumber: number } /** * Snapshot of practice state for metadata capture */ interface PracticeStateSnapshot { problem: { terms: number[]; answer: number } | null studentAnswer: string phase: 'problem' | 'feedback' isCorrect: boolean | null } /** * Metadata entry for a single frame */ export interface ProblemMetadataEntry { /** Timestamp in ms from video start */ t: number /** Detected abacus value from vision */ detectedValue: number | null /** Detection confidence 0-1 */ confidence: number /** Student's typed answer */ studentAnswer: string /** Current phase */ phase: 'problem' | 'feedback' /** Whether answer is correct (only in feedback phase) */ isCorrect?: boolean } /** * Full metadata for a problem video */ export interface ProblemMetadata { /** Unique slot ID matching the session plan's problem slot */ slotId: string /** Problem details */ problem: { terms: number[]; answer: number } /** Time-coded entries */ entries: ProblemMetadataEntry[] /** Duration in ms */ durationMs: number /** Total frames */ frameCount: number /** Final result */ isCorrect: boolean | null } /** * Recording state for a single problem within a session */ interface ProblemRecording { videoId: string problemNumber: number partIndex: number /** Unique slot ID matching the session plan's problem slot */ slotId: string /** Epoch number: 0 = initial pass, 1-2 = retry epochs */ epochNumber: number /** Attempt number within the epoch (1-indexed) */ attemptNumber: number /** Whether this is a retry (epoch > 0) */ isRetry: boolean /** Whether this is a manual redo (student clicked on completed problem) */ isManualRedo: boolean framesDir: string frameCount: number startedAt: Date lastFrameAt: Date isCorrect?: boolean /** Problem details from the marker (not from stale state) */ problem: { terms: number[]; answer: number } | null /** Metadata entries for this problem */ metadata: ProblemMetadataEntry[] } /** * Recording session state - tracks active session and current problem */ interface RecordingSession { sessionId: string playerId: string sessionStartedAt: Date currentProblem: ProblemRecording | null /** Latest practice state for metadata capture */ latestPracticeState: PracticeStateSnapshot } /** * Configuration for the VisionRecorder */ export interface VisionRecorderConfig { /** Base directory for storing recordings (default: data/uploads/vision-recordings) */ uploadDir: string /** Target frames per second (default: 5) */ targetFps: number /** Maximum frame age in ms before dropping (default: 200) */ maxFrameAgeMs: number /** Recording retention period in days (default: 7) */ retentionDays: number /** Size of the ring buffer for live DVR in seconds (default: 60) */ dvrBufferSeconds: number } const DEFAULT_CONFIG: VisionRecorderConfig = { uploadDir: 'data/uploads/vision-recordings', targetFps: 5, maxFrameAgeMs: 200, retentionDays: 7, dvrBufferSeconds: 60, } /** * Current problem info for DVR scrubbing */ interface CurrentProblemInfo { problemNumber: number startMs: number // Offset from session start } /** * Callback for when a problem video is ready */ export type VideoReadyCallback = (data: { sessionId: string problemNumber: number durationMs: number videoUrl: string }) => void /** * Callback for when a problem video encoding fails */ export type VideoFailedCallback = (data: { sessionId: string problemNumber: number error: string }) => void /** * VisionRecorder - Server-side service for recording vision frames during practice sessions. * * Records frames per-problem (not per-session), allowing: * - Incremental encoding as each problem completes * - Direct access to individual problem videos * - Click on any problem in observer nav to see that problem's video * * Usage: * const recorder = VisionRecorder.getInstance() * recorder.startSession(sessionId, playerId) * recorder.addFrame(frameData) * recorder.onProblemMarker(sessionId, marker) // Triggers encoding on problem transitions * await recorder.stopSession(sessionId) */ export class VisionRecorder { private static instance: VisionRecorder | null = null private config: VisionRecorderConfig private activeSessions: Map<string, RecordingSession> = new Map() private frameTimestamps: Map<string, number[]> = new Map() // For FPS tracking private dvrBuffers: Map<string, VisionFrame[]> = new Map() // Ring buffer for DVR private currentProblemInfo: Map<string, CurrentProblemInfo> = new Map() // For per-problem DVR scrubbing // Callbacks for notifying observers when videos are ready private onVideoReady: VideoReadyCallback | null = null private onVideoFailed: VideoFailedCallback | null = null private constructor(config: Partial<VisionRecorderConfig> = {}) { this.config = { ...DEFAULT_CONFIG, ...config } } /** * Get the singleton instance */ static getInstance(config?: Partial<VisionRecorderConfig>): VisionRecorder { if (!VisionRecorder.instance) { VisionRecorder.instance = new VisionRecorder(config) } return VisionRecorder.instance } /** * Reset the singleton (for testing) */ static resetInstance(): void { VisionRecorder.instance = null } /** * Set callback for when a problem video is ready */ setVideoReadyCallback(callback: VideoReadyCallback): void { this.onVideoReady = callback } /** * Set callback for when a problem video encoding fails */ setVideoFailedCallback(callback: VideoFailedCallback): void { this.onVideoFailed = callback } /** * Start recording session for a practice session. * Does NOT create any directories yet - those are created per-problem. */ startSession(sessionId: string, playerId: string): void { // Check if already recording if (this.activeSessions.has(sessionId)) { console.log(`[VisionRecorder] Already recording session ${sessionId}`) return } const now = new Date() // Initialize session state (no current problem yet) const session: RecordingSession = { sessionId, playerId, sessionStartedAt: now, currentProblem: null, latestPracticeState: { problem: null, studentAnswer: '', phase: 'problem', isCorrect: null, }, } this.activeSessions.set(sessionId, session) this.frameTimestamps.set(sessionId, []) this.dvrBuffers.set(sessionId, []) console.log(`[VisionRecorder] Started session for ${sessionId}`) } /** * Update practice state for metadata capture. * Called when practice-state socket event is received. * * IMPORTANT: This captures metadata even when no video frames are being recorded. * This ensures we have a record of student answers for all problems. */ onPracticeState(sessionId: string, state: PracticeStateInput): void { const session = this.activeSessions.get(sessionId) if (!session) { return } const prevState = session.latestPracticeState // Update latest practice state snapshot session.latestPracticeState = { problem: state.currentProblem, studentAnswer: state.studentAnswer, phase: state.phase === 'tutorial' ? 'problem' : state.phase, isCorrect: state.isCorrect, } // If we have a current problem recording and no problem details yet, capture them if (session.currentProblem && !session.currentProblem.problem && state.currentProblem) { session.currentProblem.problem = state.currentProblem } // Add metadata entry when state changes (even without video frames) // This ensures we capture student input regardless of camera status const problem = session.currentProblem if (problem) { const stateChanged = prevState.studentAnswer !== state.studentAnswer || prevState.phase !== (state.phase === 'tutorial' ? 'problem' : state.phase) || prevState.isCorrect !== state.isCorrect if (stateChanged) { const now = Date.now() const tFromProblemStart = now - problem.startedAt.getTime() const phase = state.phase === 'tutorial' ? 'problem' : state.phase const metadataEntry: ProblemMetadataEntry = { t: tFromProblemStart, detectedValue: null, // No frame data confidence: 0, studentAnswer: state.studentAnswer, phase, ...(phase === 'feedback' && state.isCorrect !== null ? { isCorrect: state.isCorrect } : {}), } problem.metadata.push(metadataEntry) } } } /** * Handle problem marker - this is the key method for per-problem recording. * * When 'problem-shown' is received: * - Finalize and encode the previous problem (if any) * - Start recording for the new problem * * When 'answer-submitted' is received: * - Store the correctness for the current problem */ async onProblemMarker(sessionId: string, marker: ProblemMarkerInput): Promise<void> { const session = this.activeSessions.get(sessionId) if (!session) { console.warn(`[VisionRecorder] Cannot add marker - no session for ${sessionId}`) return } const offsetMs = Date.now() - session.sessionStartedAt.getTime() // Track current problem for DVR scrubbing if (marker.eventType === 'problem-shown') { this.currentProblemInfo.set(sessionId, { problemNumber: marker.problemNumber, startMs: offsetMs, }) // If there was a previous problem being recorded, finalize and encode it if (session.currentProblem) { console.log( `[VisionRecorder] Problem ${session.currentProblem.problemNumber} ended, starting encoding` ) await this.finalizeProblem(session) } // Start recording for the new problem await this.startProblemRecording( session, marker.problemNumber, marker.partIndex, marker.epochNumber, marker.attemptNumber, marker.isRetry, marker.isManualRedo, marker.problem ?? null, marker.slotId ) console.log( `[VisionRecorder] Problem ${marker.problemNumber} started at offset ${offsetMs}ms for session ${sessionId}` ) } else if (marker.eventType === 'answer-submitted') { // Store correctness on the current problem if (session.currentProblem) { session.currentProblem.isCorrect = marker.isCorrect console.log( `[VisionRecorder] Problem ${marker.problemNumber} answered: ${marker.isCorrect ? 'correct' : 'incorrect'}` ) } } } /** * Start recording for a specific problem */ private async startProblemRecording( session: RecordingSession, problemNumber: number, partIndex: number, epochNumber: number, attemptNumber: number, isRetry: boolean, isManualRedo: boolean, problem: { terms: number[]; answer: number } | null, slotId: string ): Promise<void> { const videoId = createId() // New filename pattern: problem_NNN_eX_aY.mp4 const baseName = `problem_${problemNumber.toString().padStart(3, '0')}_e${epochNumber}_a${attemptNumber}` const filename = `${baseName}.mp4` const framesDir = path.join( this.config.uploadDir, session.playerId, session.sessionId, `${baseName}.frames` ) const now = new Date() const expiresAt = new Date(now.getTime() + this.config.retentionDays * 24 * 60 * 60 * 1000) // Create frames directory await mkdir(framesDir, { recursive: true }) // Create database record const newVideo: NewVisionProblemVideo = { id: videoId, sessionId: session.sessionId, playerId: session.playerId, problemNumber, partIndex, epochNumber, attemptNumber, isRetry, isManualRedo, filename, startedAt: now, expiresAt, status: 'recording', } await db.insert(visionProblemVideos).values(newVideo) // Update session's current problem session.currentProblem = { videoId, problemNumber, partIndex, slotId, epochNumber, attemptNumber, isRetry, isManualRedo, framesDir, frameCount: 0, startedAt: now, lastFrameAt: now, problem: problem ?? session.latestPracticeState.problem, // Prefer marker data over potentially stale state metadata: [], } console.log( `[VisionRecorder] Started problem ${problemNumber} (e${epochNumber}/a${attemptNumber}) recording: ${videoId} -> ${framesDir}` ) } /** * Finalize the current problem and trigger encoding * * IMPORTANT: Metadata is always written, even if there are no video frames. * This ensures we have a record of student answers for all problems. */ private async finalizeProblem(session: RecordingSession): Promise<void> { const problem = session.currentProblem if (!problem) return const endedAt = new Date() const durationMs = endedAt.getTime() - problem.startedAt.getTime() const avgFps = problem.frameCount > 0 ? (problem.frameCount / durationMs) * 1000 : 0 const hasVideo = problem.frameCount > 0 // Determine initial status based on whether we have video frames const initialStatus: VisionProblemVideoStatus = hasVideo ? 'processing' : 'no_video' // Update database record await db .update(visionProblemVideos) .set({ status: initialStatus, endedAt, durationMs, frameCount: problem.frameCount, avgFps, isCorrect: problem.isCorrect, }) .where(eq(visionProblemVideos.id, problem.videoId)) // Write metadata JSON - ALWAYS, even without video frames // This ensures we capture student answers for playback/review if (problem.problem || problem.metadata.length > 0) { const metadata: ProblemMetadata = { slotId: problem.slotId, problem: problem.problem ?? { terms: [], answer: 0 }, // Fallback if problem details weren't captured entries: problem.metadata, durationMs, frameCount: problem.frameCount, isCorrect: problem.isCorrect ?? null, } // Match the new filename pattern: problem_NNN_eX_aY.meta.json const baseName = `problem_${problem.problemNumber.toString().padStart(3, '0')}_e${problem.epochNumber}_a${problem.attemptNumber}` const metadataPath = path.join( this.config.uploadDir, session.playerId, session.sessionId, `${baseName}.meta.json` ) try { // Ensure directory exists (may not exist if no frames were captured) const dir = path.dirname(metadataPath) await mkdir(dir, { recursive: true }) await writeFile(metadataPath, JSON.stringify(metadata, null, 2)) console.log( `[VisionRecorder] Wrote metadata for problem ${problem.problemNumber}: ${problem.metadata.length} entries (${hasVideo ? 'with video' : 'no video'})` ) } catch (error) { console.error( `[VisionRecorder] Failed to write metadata for problem ${problem.problemNumber}:`, error ) } } console.log( `[VisionRecorder] Finalized problem ${problem.problemNumber}: ${problem.frameCount} frames, ${(durationMs / 1000).toFixed(1)}s, ${avgFps.toFixed(1)} fps` ) // Clear current problem session.currentProblem = null // Only trigger encoding if we have frames if (hasVideo) { this.encodeProblemVideo(problem.videoId, session.sessionId, problem.problemNumber).catch( (error) => { console.error( `[VisionRecorder] Encoding failed for problem ${problem.problemNumber}:`, error ) } ) } else { // Clean up the empty frames directory if it exists try { await rm(problem.framesDir, { recursive: true, force: true }) } catch { // Ignore if directory doesn't exist } } } /** * Add a frame to the current problem's recording. * Handles frame rate limiting and DVR buffer management. */ async addFrame(frame: VisionFrame): Promise<boolean> { const session = this.activeSessions.get(frame.sessionId) if (!session) { return false } const now = Date.now() const frameAge = now - frame.timestamp // Drop stale frames if (frameAge > this.config.maxFrameAgeMs) { console.log(`[VisionRecorder] Dropping stale frame (${frameAge}ms old)`) return false } // Check frame rate const timestamps = this.frameTimestamps.get(frame.sessionId) || [] const recentTimestamps = timestamps.filter((t) => now - t < 1000) if (recentTimestamps.length >= this.config.targetFps) { // At target FPS, drop frame return false } // Add to DVR buffer (ring buffer) - always, regardless of problem recording const dvrBuffer = this.dvrBuffers.get(frame.sessionId) || [] dvrBuffer.push(frame) // Calculate max DVR buffer size based on FPS const maxDvrFrames = this.config.dvrBufferSeconds * this.config.targetFps while (dvrBuffer.length > maxDvrFrames) { dvrBuffer.shift() } this.dvrBuffers.set(frame.sessionId, dvrBuffer) // Save frame to disk (only if we have a current problem) const problem = session.currentProblem if (!problem) { // No current problem - frame goes to DVR buffer only, not saved to disk recentTimestamps.push(now) this.frameTimestamps.set(frame.sessionId, recentTimestamps) return true } // Save frame to problem's frames directory const frameNumber = problem.frameCount.toString().padStart(6, '0') const framePath = path.join(problem.framesDir, `frame_${frameNumber}.jpg`) try { // Remove data URL prefix if present const base64Data = frame.imageData.replace(/^data:image\/\w+;base64,/, '') const buffer = Buffer.from(base64Data, 'base64') await writeFile(framePath, buffer) // Calculate timestamp relative to problem start (for metadata) const tFromProblemStart = frame.timestamp - problem.startedAt.getTime() // Create metadata entry combining frame data with latest practice state const metadataEntry: ProblemMetadataEntry = { t: tFromProblemStart, detectedValue: frame.detectedValue, confidence: frame.confidence, studentAnswer: session.latestPracticeState.studentAnswer, phase: session.latestPracticeState.phase, ...(session.latestPracticeState.phase === 'feedback' && session.latestPracticeState.isCorrect !== null ? { isCorrect: session.latestPracticeState.isCorrect } : {}), } problem.metadata.push(metadataEntry) problem.frameCount++ problem.lastFrameAt = new Date(frame.timestamp) // Update FPS tracking recentTimestamps.push(now) this.frameTimestamps.set(frame.sessionId, recentTimestamps) return true } catch (error) { console.error(`[VisionRecorder] Error saving frame:`, error) return false } } /** * Stop recording session. * Finalizes and encodes the current problem (if any). */ async stopSession(sessionId: string): Promise<void> { const session = this.activeSessions.get(sessionId) if (!session) { console.log(`[VisionRecorder] No active session for ${sessionId}`) return } // Finalize the current problem (the last one) if (session.currentProblem) { console.log( `[VisionRecorder] Session ending, finalizing problem ${session.currentProblem.problemNumber}` ) await this.finalizeProblem(session) } // Clean up in-memory state this.activeSessions.delete(sessionId) this.frameTimestamps.delete(sessionId) this.dvrBuffers.delete(sessionId) this.currentProblemInfo.delete(sessionId) console.log(`[VisionRecorder] Stopped session ${sessionId}`) } /** * Encode a problem's frames into MP4 video. */ private async encodeProblemVideo( videoId: string, sessionId: string, problemNumber: number ): Promise<void> { // Get video record from database const video = await db.query.visionProblemVideos.findFirst({ where: eq(visionProblemVideos.id, videoId), }) if (!video) { console.error(`[VisionRecorder] Video ${videoId} not found`) return } // Derive framesDir from filename (e.g., problem_001_e0_a1.mp4 -> problem_001_e0_a1.frames) const baseName = video.filename.replace('.mp4', '') const framesDir = path.join( this.config.uploadDir, video.playerId, video.sessionId, `${baseName}.frames` ) const outputPath = path.join( this.config.uploadDir, video.playerId, video.sessionId, video.filename ) try { // Check if ffmpeg is available const ffmpegAvailable = await VideoEncoder.isAvailable() if (!ffmpegAvailable) { console.error('[VisionRecorder] ffmpeg not available, cannot encode video') // Mark as failed - ffmpeg is required for video encoding await db .update(visionProblemVideos) .set({ status: 'failed', processingError: 'ffmpeg not available on server', }) .where(eq(visionProblemVideos.id, videoId)) // Notify observers of failure if (this.onVideoFailed) { this.onVideoFailed({ sessionId, problemNumber, error: 'ffmpeg not available on server', }) } return } // Encode frames to MP4 const result = await VideoEncoder.encode({ framesDir, outputPath, fps: this.config.targetFps, quality: 23, // Good balance of quality and size preset: 'fast', // Faster encoding, slightly larger file }) if (!result.success) { throw new Error(result.error || 'Encoding failed') } // Update database with encoding results await db .update(visionProblemVideos) .set({ status: 'ready', fileSize: result.fileSize, }) .where(eq(visionProblemVideos.id, videoId)) console.log( `[VisionRecorder] Encoded problem ${problemNumber}: ${(result.fileSize! / 1024).toFixed(1)} KB` ) // Notify observers that video is ready if (this.onVideoReady) { this.onVideoReady({ sessionId, problemNumber, durationMs: video.durationMs || 0, videoUrl: `/api/curriculum/${video.playerId}/sessions/${video.sessionId}/problems/${problemNumber}/video`, }) } // Clean up frame files after successful encoding await VideoEncoder.cleanupFrames(framesDir) } catch (error) { const errorMessage = error instanceof Error ? error.message : 'Unknown error' console.error(`[VisionRecorder] Encoding failed for problem ${problemNumber}:`, errorMessage) await db .update(visionProblemVideos) .set({ status: 'failed', processingError: errorMessage, }) .where(eq(visionProblemVideos.id, videoId)) // Notify observers of failure if (this.onVideoFailed) { this.onVideoFailed({ sessionId, problemNumber, error: errorMessage, }) } } } /** * Get a frame from the DVR buffer for scrub-back. * @param sessionId The session to get the frame from * @param offsetMs Offset from session start */ getDvrFrame(sessionId: string, offsetMs: number): VisionFrame | null { const dvrBuffer = this.dvrBuffers.get(sessionId) const session = this.activeSessions.get(sessionId) if (!dvrBuffer || !session || dvrBuffer.length === 0) { return null } // Calculate target timestamp const targetTimestamp = session.sessionStartedAt.getTime() + offsetMs // Find closest frame let closestFrame = dvrBuffer[0] let closestDiff = Math.abs(closestFrame.timestamp - targetTimestamp) for (const frame of dvrBuffer) { const diff = Math.abs(frame.timestamp - targetTimestamp) if (diff < closestDiff) { closestFrame = frame closestDiff = diff } } return closestFrame } /** * Get DVR buffer info for a session, including current problem boundaries */ getDvrBufferInfo(sessionId: string): { availableFromMs: number availableToMs: number currentProblemStartMs: number | null currentProblemNumber: number | null } | null { const dvrBuffer = this.dvrBuffers.get(sessionId) const session = this.activeSessions.get(sessionId) if (!dvrBuffer || !session || dvrBuffer.length === 0) { return null } const startOffset = dvrBuffer[0].timestamp - session.sessionStartedAt.getTime() const endOffset = dvrBuffer[dvrBuffer.length - 1].timestamp - session.sessionStartedAt.getTime() const problemInfo = this.currentProblemInfo.get(sessionId) return { availableFromMs: startOffset, availableToMs: endOffset, currentProblemStartMs: problemInfo?.startMs ?? null, currentProblemNumber: problemInfo?.problemNumber ?? null, } } /** * Check if a session is currently being recorded */ isRecording(sessionId: string): boolean { return this.activeSessions.has(sessionId) } /** * Get list of available problem videos for a session */ async getSessionVideos( sessionId: string ): Promise<Array<{ problemNumber: number; status: string; durationMs: number | null }>> { const videos = await db.query.visionProblemVideos.findMany({ where: eq(visionProblemVideos.sessionId, sessionId), orderBy: (table, { asc }) => [asc(table.problemNumber)], }) return videos.map((v) => ({ problemNumber: v.problemNumber, status: v.status, durationMs: v.durationMs, })) } /** * Clean up expired recordings. * Should be called periodically (e.g., by a cron job). */ async cleanupExpiredRecordings(): Promise<number> { const now = new Date() // Find expired videos const expired = await db.query.visionProblemVideos.findMany({ where: (table, { lt }) => lt(table.expiresAt, now), }) let deletedCount = 0 // Group by session to clean up directories efficiently const sessionGroups = new Map<string, typeof expired>() for (const video of expired) { const key = `${video.playerId}/${video.sessionId}` if (!sessionGroups.has(key)) { sessionGroups.set(key, []) } sessionGroups.get(key)!.push(video) } for (const [, videos] of sessionGroups) { for (const video of videos) { try { // Delete video file, frames directory, and metadata file const videoPath = path.join( this.config.uploadDir, video.playerId, video.sessionId, video.filename ) // Derive framesDir and metadataPath from filename const baseName = video.filename.replace('.mp4', '') const framesDir = path.join( this.config.uploadDir, video.playerId, video.sessionId, `${baseName}.frames` ) const metadataPath = path.join( this.config.uploadDir, video.playerId, video.sessionId, `${baseName}.meta.json` ) await rm(videoPath, { force: true }) await rm(framesDir, { recursive: true, force: true }) await rm(metadataPath, { force: true }) // Delete database record await db.delete(visionProblemVideos).where(eq(visionProblemVideos.id, video.id)) deletedCount++ console.log( `[VisionRecorder] Deleted expired video ${video.id} (problem ${video.problemNumber})` ) } catch (error) { console.error(`[VisionRecorder] Failed to delete video ${video.id}:`, error) } } // Try to clean up session directory if empty try { const sessionDir = path.join(this.config.uploadDir, videos[0].playerId, videos[0].sessionId) await rm(sessionDir, { recursive: true, force: true }) } catch { // Directory might not be empty or might not exist, that's ok } } if (deletedCount > 0) { console.log(`[VisionRecorder] Cleaned up ${deletedCount} expired video recordings`) } return deletedCount } } |