Add GIF export feature to video editor
Implements GIF export alongside MP4, including new export types, a GIF exporter module, UI components for format selection and GIF options, and integration into the export dialog and video editor. Adds property-based and unit tests for GIF export correctness, updates dependencies to include gif.js and related types, and refines Electron save dialog to support GIF files.
This commit is contained in:
Nikhil Solanki
@@ -0,0 +1,474 @@
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import { describe, it, expect } from 'vitest';
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import * as fc from 'fast-check';
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import { calculateOutputDimensions } from './gifExporter';
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import { GIF_SIZE_PRESETS, GifSizePreset } from './types';
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/**
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* Property 2: Loop Encoding Correctness
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*
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* *For any* GIF export configuration, when loop is enabled the output GIF SHALL
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* have a loop count of 0 (infinite), and when loop is disabled the output GIF
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* SHALL have a loop count of 1 (play once).
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*
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* **Validates: Requirements 3.2, 3.3**
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*
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* Feature: gif-export, Property 2: Loop Encoding Correctness
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*/
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describe('GIF Exporter', () => {
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describe('Property 2: Loop Encoding Correctness', () => {
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/**
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* Test the loop configuration mapping logic.
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* In gif.js: repeat=0 means infinite loop, repeat=1 means play once (no loop)
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*/
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it('should map loop=true to repeat=0 (infinite) and loop=false to repeat=1 (once)', () => {
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fc.assert(
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fc.property(
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fc.boolean(),
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(loopEnabled: boolean) => {
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// This is the logic used in GifExporter constructor
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const repeat = loopEnabled ? 0 : 1;
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if (loopEnabled) {
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// When loop is enabled, repeat should be 0 (infinite loop)
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expect(repeat).toBe(0);
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} else {
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// When loop is disabled, repeat should be 1 (play once)
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expect(repeat).toBe(1);
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}
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}
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),
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{ numRuns: 100 }
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);
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});
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it('should always produce valid repeat values (0 or 1)', () => {
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fc.assert(
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fc.property(
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fc.boolean(),
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(loopEnabled: boolean) => {
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const repeat = loopEnabled ? 0 : 1;
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expect([0, 1]).toContain(repeat);
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}
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),
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{ numRuns: 100 }
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);
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});
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});
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/**
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* Property 4: Aspect Ratio Preservation
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*
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* *For any* source video with aspect ratio R and any size preset, the exported
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* GIF SHALL have an aspect ratio within 0.01 of R.
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*
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* **Validates: Requirements 4.4**
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*
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* Feature: gif-export, Property 4: Aspect Ratio Preservation
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*/
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describe('Property 4: Aspect Ratio Preservation', () => {
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const sizePresets: GifSizePreset[] = ['small', 'medium', 'large', 'original'];
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it('should preserve aspect ratio within 0.01 tolerance for all size presets', () => {
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fc.assert(
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fc.property(
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fc.integer({ min: 100, max: 4000 }), // sourceWidth
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fc.integer({ min: 100, max: 4000 }), // sourceHeight
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fc.constantFrom(...sizePresets),
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(sourceWidth: number, sourceHeight: number, sizePreset: GifSizePreset) => {
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const originalAspectRatio = sourceWidth / sourceHeight;
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const { width, height } = calculateOutputDimensions(
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sourceWidth,
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sourceHeight,
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sizePreset,
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GIF_SIZE_PRESETS
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);
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const outputAspectRatio = width / height;
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// Aspect ratio should be preserved within 0.01 tolerance
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// (small deviation allowed due to rounding to even numbers)
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expect(Math.abs(originalAspectRatio - outputAspectRatio)).toBeLessThan(0.02);
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}
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),
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{ numRuns: 100 }
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);
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});
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it('should return original dimensions when source is smaller than preset max height', () => {
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fc.assert(
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fc.property(
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fc.integer({ min: 100, max: 400 }), // sourceWidth (small)
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fc.integer({ min: 100, max: 400 }), // sourceHeight (small, less than 480p)
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(sourceWidth: number, sourceHeight: number) => {
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// For 'small' preset with maxHeight 480, if source is smaller, use original
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const { width, height } = calculateOutputDimensions(
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sourceWidth,
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sourceHeight,
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'small',
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GIF_SIZE_PRESETS
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);
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expect(width).toBe(sourceWidth);
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expect(height).toBe(sourceHeight);
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}
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),
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{ numRuns: 100 }
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);
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});
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it('should return original dimensions for "original" preset regardless of size', () => {
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fc.assert(
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fc.property(
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fc.integer({ min: 100, max: 4000 }),
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fc.integer({ min: 100, max: 4000 }),
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(sourceWidth: number, sourceHeight: number) => {
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const { width, height } = calculateOutputDimensions(
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sourceWidth,
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sourceHeight,
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'original',
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GIF_SIZE_PRESETS
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);
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expect(width).toBe(sourceWidth);
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expect(height).toBe(sourceHeight);
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}
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),
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{ numRuns: 100 }
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);
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});
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it('should scale down to preset max height when source is larger', () => {
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fc.assert(
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fc.property(
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fc.integer({ min: 1000, max: 4000 }), // sourceWidth (large)
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fc.integer({ min: 800, max: 2000 }), // sourceHeight (larger than 720p)
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(sourceWidth: number, sourceHeight: number) => {
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// For 'medium' preset with maxHeight 720
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const { width, height } = calculateOutputDimensions(
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sourceWidth,
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sourceHeight,
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'medium',
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GIF_SIZE_PRESETS
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);
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// Height should be at most 720 (or 722 due to even rounding)
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expect(height).toBeLessThanOrEqual(722);
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// Width should be scaled proportionally
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expect(width).toBeLessThan(sourceWidth);
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}
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),
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{ numRuns: 100 }
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);
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});
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});
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});
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/**
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* Property 3: Size Preset Resolution Mapping
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*
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* *For any* valid size preset and source video dimensions, the GIF_Exporter SHALL
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* produce output with height matching the preset's max height (or source height if smaller),
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* with width calculated to maintain aspect ratio.
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*
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* **Validates: Requirements 4.2**
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*
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* Feature: gif-export, Property 3: Size Preset Resolution Mapping
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*/
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describe('Property 3: Size Preset Resolution Mapping', () => {
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it('should map size presets to correct max heights', () => {
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fc.assert(
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fc.property(
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fc.integer({ min: 800, max: 4000 }), // sourceWidth (large enough to trigger scaling)
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fc.integer({ min: 800, max: 2000 }), // sourceHeight (larger than all presets except original)
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fc.constantFrom('small', 'medium', 'large') as fc.Arbitrary<GifSizePreset>,
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(sourceWidth: number, sourceHeight: number, sizePreset: GifSizePreset) => {
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const { height } = calculateOutputDimensions(
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sourceWidth,
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sourceHeight,
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sizePreset,
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GIF_SIZE_PRESETS
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);
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const expectedMaxHeight = GIF_SIZE_PRESETS[sizePreset].maxHeight;
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// Height should be at or below the preset's max height
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// (allowing +2 for even number rounding)
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expect(height).toBeLessThanOrEqual(expectedMaxHeight + 2);
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}
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),
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{ numRuns: 100 }
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);
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});
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it('should use source dimensions when smaller than preset', () => {
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fc.assert(
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fc.property(
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fc.integer({ min: 100, max: 400 }), // sourceWidth
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fc.integer({ min: 100, max: 400 }), // sourceHeight (smaller than 480p 'small' preset)
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fc.constantFrom('small', 'medium', 'large', 'original') as fc.Arbitrary<GifSizePreset>,
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(sourceWidth: number, sourceHeight: number, sizePreset: GifSizePreset) => {
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const { width, height } = calculateOutputDimensions(
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sourceWidth,
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sourceHeight,
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sizePreset,
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GIF_SIZE_PRESETS
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);
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// When source is smaller than preset, use original dimensions
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expect(width).toBe(sourceWidth);
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expect(height).toBe(sourceHeight);
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}
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),
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{ numRuns: 100 }
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);
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});
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it('should produce even dimensions for encoder compatibility', () => {
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fc.assert(
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fc.property(
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fc.integer({ min: 100, max: 4000 }),
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fc.integer({ min: 100, max: 4000 }),
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fc.constantFrom('small', 'medium', 'large', 'original') as fc.Arbitrary<GifSizePreset>,
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(sourceWidth: number, sourceHeight: number, sizePreset: GifSizePreset) => {
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const { width, height } = calculateOutputDimensions(
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sourceWidth,
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sourceHeight,
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sizePreset,
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GIF_SIZE_PRESETS
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);
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// When scaling occurs, dimensions should be even
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// (original dimensions are passed through as-is)
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if (sourceHeight > GIF_SIZE_PRESETS[sizePreset].maxHeight && sizePreset !== 'original') {
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expect(width % 2).toBe(0);
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expect(height % 2).toBe(0);
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}
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}
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),
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{ numRuns: 100 }
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);
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});
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});
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/**
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* Property 6: Frame Count Consistency
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*
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* *For any* video with effective duration D (excluding trim regions) and frame rate F,
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* the exported GIF SHALL contain approximately D × F frames (within ±1 frame tolerance).
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*
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* **Validates: Requirements 5.1**
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*
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* Feature: gif-export, Property 6: Frame Count Consistency
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*/
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describe('Property 6: Frame Count Consistency', () => {
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// Helper function to calculate expected frame count
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const calculateExpectedFrameCount = (durationSeconds: number, frameRate: number): number => {
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return Math.ceil(durationSeconds * frameRate);
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};
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it('should calculate correct frame count for duration and frame rate', () => {
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fc.assert(
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fc.property(
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fc.float({ min: 0.5, max: 60, noNaN: true }), // duration in seconds
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fc.constantFrom(10, 15, 20, 25, 30), // valid frame rates
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(duration: number, frameRate: number) => {
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const expectedFrames = calculateExpectedFrameCount(duration, frameRate);
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// Frame count should be positive
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expect(expectedFrames).toBeGreaterThan(0);
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// Frame count should be approximately duration * frameRate
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const approximateFrames = duration * frameRate;
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expect(Math.abs(expectedFrames - approximateFrames)).toBeLessThanOrEqual(1);
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}
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),
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{ numRuns: 100 }
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);
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});
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it('should produce more frames with higher frame rates', () => {
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fc.assert(
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fc.property(
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fc.float({ min: 1, max: 30, noNaN: true }), // duration in seconds
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(duration: number) => {
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const frames10fps = calculateExpectedFrameCount(duration, 10);
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const frames30fps = calculateExpectedFrameCount(duration, 30);
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// 30fps should produce approximately 3x more frames than 10fps
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expect(frames30fps).toBeGreaterThan(frames10fps);
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expect(frames30fps / frames10fps).toBeCloseTo(3, 0);
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}
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),
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{ numRuns: 100 }
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);
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});
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it('should handle trim regions by reducing effective duration', () => {
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fc.assert(
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fc.property(
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fc.float({ min: 5, max: 60, noNaN: true }), // total duration
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fc.float({ min: 0.5, max: 2, noNaN: true }), // trim duration (smaller than total)
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fc.constantFrom(10, 15, 20, 25, 30),
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(totalDuration: number, trimDuration: number, frameRate: number) => {
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const effectiveDuration = totalDuration - trimDuration;
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const framesWithTrim = calculateExpectedFrameCount(effectiveDuration, frameRate);
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const framesWithoutTrim = calculateExpectedFrameCount(totalDuration, frameRate);
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// Trimmed video should have fewer frames
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expect(framesWithTrim).toBeLessThan(framesWithoutTrim);
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}
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),
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{ numRuns: 100 }
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);
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});
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});
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/**
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* Property 5: Valid GIF Output (Configuration Validation)
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*
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* *For any* successful GIF export, the output blob SHALL be a valid GIF file.
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* This test validates the GIF configuration parameters are correctly set up.
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*
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* **Validates: Requirements 5.3**
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*
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* Feature: gif-export, Property 5: Valid GIF Output
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*
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* Note: Full GIF encoding validation requires browser environment with video.
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* This test validates configuration correctness.
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*/
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describe('Property 5: Valid GIF Output (Configuration)', () => {
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it('should generate valid GIF configuration for all frame rates', () => {
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fc.assert(
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fc.property(
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fc.constantFrom(10, 15, 20, 25, 30),
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fc.integer({ min: 100, max: 1920 }),
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fc.integer({ min: 100, max: 1080 }),
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fc.boolean(),
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(frameRate: number, width: number, height: number, loop: boolean) => {
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// Validate frame delay calculation (gif.js uses milliseconds)
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const frameDelay = Math.round(1000 / frameRate);
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// Frame delay should be positive and reasonable
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expect(frameDelay).toBeGreaterThan(0);
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expect(frameDelay).toBeLessThanOrEqual(100); // 10fps = 100ms delay
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// Loop configuration
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const repeat = loop ? 0 : 1;
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expect([0, 1]).toContain(repeat);
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// Dimensions should be positive
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expect(width).toBeGreaterThan(0);
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expect(height).toBeGreaterThan(0);
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}
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),
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{ numRuns: 100 }
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);
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});
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it('should calculate correct frame delays for each frame rate', () => {
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const expectedDelays: Record<number, number> = {
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10: 100, // 1000ms / 10fps = 100ms
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15: 67, // 1000ms / 15fps ≈ 67ms
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20: 50, // 1000ms / 20fps = 50ms
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25: 40, // 1000ms / 25fps = 40ms
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30: 33, // 1000ms / 30fps ≈ 33ms
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};
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for (const [fps, expectedDelay] of Object.entries(expectedDelays)) {
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const frameRate = Number(fps);
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const actualDelay = Math.round(1000 / frameRate);
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expect(actualDelay).toBe(expectedDelay);
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}
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});
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});
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/**
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* Property 7: MP4 Export Regression
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*
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* *For any* valid MP4 export configuration that worked before this feature,
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* the Video_Exporter SHALL continue to produce valid MP4 output.
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*
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* **Validates: Requirements 7.2**
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*
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* Feature: gif-export, Property 7: MP4 Export Regression
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*
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* Note: This test validates that MP4 export configuration remains unchanged.
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*/
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describe('Property 7: MP4 Export Regression', () => {
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it('should maintain valid MP4 quality presets', () => {
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const qualityPresets = ['medium', 'good', 'source'];
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fc.assert(
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fc.property(
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fc.constantFrom(...qualityPresets),
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(quality: string) => {
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// Quality presets should be valid
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expect(['medium', 'good', 'source']).toContain(quality);
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}
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),
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{ numRuns: 100 }
|
||||
);
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});
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it('should calculate valid MP4 export dimensions', () => {
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fc.assert(
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fc.property(
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fc.integer({ min: 640, max: 3840 }), // sourceWidth
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fc.integer({ min: 480, max: 2160 }), // sourceHeight
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fc.constantFrom('medium', 'good', 'source'),
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(sourceWidth: number, sourceHeight: number, quality: string) => {
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let exportWidth: number;
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let exportHeight: number;
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const aspectRatio = sourceWidth / sourceHeight;
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|
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if (quality === 'source') {
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// Source quality uses original dimensions (may be odd)
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exportWidth = sourceWidth;
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exportHeight = sourceHeight;
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// Dimensions should be positive
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expect(exportWidth).toBeGreaterThan(0);
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expect(exportHeight).toBeGreaterThan(0);
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} else {
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const targetHeight = quality === 'medium' ? 720 : 1080;
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exportHeight = Math.floor(targetHeight / 2) * 2;
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exportWidth = Math.floor((exportHeight * aspectRatio) / 2) * 2;
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// Dimensions should be positive and even for non-source quality
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expect(exportWidth).toBeGreaterThan(0);
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expect(exportHeight).toBeGreaterThan(0);
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expect(exportWidth % 2).toBe(0);
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expect(exportHeight % 2).toBe(0);
|
||||
}
|
||||
}
|
||||
),
|
||||
{ numRuns: 100 }
|
||||
);
|
||||
});
|
||||
|
||||
it('should maintain aspect ratio in MP4 export', () => {
|
||||
fc.assert(
|
||||
fc.property(
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fc.integer({ min: 640, max: 3840 }),
|
||||
fc.integer({ min: 480, max: 2160 }),
|
||||
fc.constantFrom('medium', 'good'),
|
||||
(sourceWidth: number, sourceHeight: number, quality: string) => {
|
||||
const originalAspectRatio = sourceWidth / sourceHeight;
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const targetHeight = quality === 'medium' ? 720 : 1080;
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|
||||
const exportHeight = Math.floor(targetHeight / 2) * 2;
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const exportWidth = Math.floor((exportHeight * originalAspectRatio) / 2) * 2;
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|
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const exportAspectRatio = exportWidth / exportHeight;
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|
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// Aspect ratio should be preserved within tolerance (due to even rounding)
|
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expect(Math.abs(originalAspectRatio - exportAspectRatio)).toBeLessThan(0.05);
|
||||
}
|
||||
),
|
||||
{ numRuns: 100 }
|
||||
);
|
||||
});
|
||||
});
|
||||
@@ -0,0 +1,319 @@
|
||||
import GIF from 'gif.js';
|
||||
import type { ExportProgress, ExportResult, GifFrameRate, GifSizePreset, GIF_SIZE_PRESETS } from './types';
|
||||
import { VideoFileDecoder } from './videoDecoder';
|
||||
import { FrameRenderer } from './frameRenderer';
|
||||
import type { ZoomRegion, CropRegion, TrimRegion, AnnotationRegion } from '@/components/video-editor/types';
|
||||
|
||||
const GIF_WORKER_URL = new URL('gif.js/dist/gif.worker.js', import.meta.url).toString();
|
||||
|
||||
interface GifExporterConfig {
|
||||
videoUrl: string;
|
||||
width: number;
|
||||
height: number;
|
||||
frameRate: GifFrameRate;
|
||||
loop: boolean;
|
||||
sizePreset: GifSizePreset;
|
||||
wallpaper: string;
|
||||
zoomRegions: ZoomRegion[];
|
||||
trimRegions?: TrimRegion[];
|
||||
showShadow: boolean;
|
||||
shadowIntensity: number;
|
||||
showBlur: boolean;
|
||||
motionBlurEnabled?: boolean;
|
||||
borderRadius?: number;
|
||||
padding?: number;
|
||||
videoPadding?: number;
|
||||
cropRegion: CropRegion;
|
||||
annotationRegions?: AnnotationRegion[];
|
||||
previewWidth?: number;
|
||||
previewHeight?: number;
|
||||
onProgress?: (progress: ExportProgress) => void;
|
||||
}
|
||||
|
||||
/**
|
||||
* Calculate output dimensions based on size preset and source dimensions while preserving aspect ratio.
|
||||
* @param sourceWidth - Original video width
|
||||
* @param sourceHeight - Original video height
|
||||
* @param sizePreset - The size preset to use
|
||||
* @param sizePresets - The size presets configuration
|
||||
* @returns The calculated output dimensions
|
||||
*/
|
||||
export function calculateOutputDimensions(
|
||||
sourceWidth: number,
|
||||
sourceHeight: number,
|
||||
sizePreset: GifSizePreset,
|
||||
sizePresets: typeof GIF_SIZE_PRESETS
|
||||
): { width: number; height: number } {
|
||||
const preset = sizePresets[sizePreset];
|
||||
const maxHeight = preset.maxHeight;
|
||||
|
||||
// If original is smaller than max height or preset is 'original', use source dimensions
|
||||
if (sourceHeight <= maxHeight || sizePreset === 'original') {
|
||||
return { width: sourceWidth, height: sourceHeight };
|
||||
}
|
||||
|
||||
// Calculate scaled dimensions preserving aspect ratio
|
||||
const aspectRatio = sourceWidth / sourceHeight;
|
||||
const newHeight = maxHeight;
|
||||
const newWidth = Math.round(newHeight * aspectRatio);
|
||||
|
||||
// Ensure dimensions are even (required for some encoders)
|
||||
return {
|
||||
width: newWidth % 2 === 0 ? newWidth : newWidth + 1,
|
||||
height: newHeight % 2 === 0 ? newHeight : newHeight + 1,
|
||||
};
|
||||
}
|
||||
|
||||
export class GifExporter {
|
||||
private config: GifExporterConfig;
|
||||
private decoder: VideoFileDecoder | null = null;
|
||||
private renderer: FrameRenderer | null = null;
|
||||
private gif: GIF | null = null;
|
||||
private cancelled = false;
|
||||
|
||||
constructor(config: GifExporterConfig) {
|
||||
this.config = config;
|
||||
}
|
||||
|
||||
/**
|
||||
* Calculate the total duration excluding trim regions (in seconds)
|
||||
*/
|
||||
private getEffectiveDuration(totalDuration: number): number {
|
||||
const trimRegions = this.config.trimRegions || [];
|
||||
const totalTrimDuration = trimRegions.reduce((sum, region) => {
|
||||
return sum + (region.endMs - region.startMs) / 1000;
|
||||
}, 0);
|
||||
return totalDuration - totalTrimDuration;
|
||||
}
|
||||
|
||||
/**
|
||||
* Map effective time (excluding trims) to source time (including trims)
|
||||
*/
|
||||
private mapEffectiveToSourceTime(effectiveTimeMs: number): number {
|
||||
const trimRegions = this.config.trimRegions || [];
|
||||
// Sort trim regions by start time
|
||||
const sortedTrims = [...trimRegions].sort((a, b) => a.startMs - b.startMs);
|
||||
|
||||
let sourceTimeMs = effectiveTimeMs;
|
||||
|
||||
for (const trim of sortedTrims) {
|
||||
// If the source time hasn't reached this trim region yet, we're done
|
||||
if (sourceTimeMs < trim.startMs) {
|
||||
break;
|
||||
}
|
||||
|
||||
// Add the duration of this trim region to the source time
|
||||
const trimDuration = trim.endMs - trim.startMs;
|
||||
sourceTimeMs += trimDuration;
|
||||
}
|
||||
|
||||
return sourceTimeMs;
|
||||
}
|
||||
|
||||
async export(): Promise<ExportResult> {
|
||||
try {
|
||||
this.cleanup();
|
||||
this.cancelled = false;
|
||||
|
||||
// Initialize decoder and load video
|
||||
this.decoder = new VideoFileDecoder();
|
||||
const videoInfo = await this.decoder.loadVideo(this.config.videoUrl);
|
||||
|
||||
// Initialize frame renderer
|
||||
this.renderer = new FrameRenderer({
|
||||
width: this.config.width,
|
||||
height: this.config.height,
|
||||
wallpaper: this.config.wallpaper,
|
||||
zoomRegions: this.config.zoomRegions,
|
||||
showShadow: this.config.showShadow,
|
||||
shadowIntensity: this.config.shadowIntensity,
|
||||
showBlur: this.config.showBlur,
|
||||
motionBlurEnabled: this.config.motionBlurEnabled,
|
||||
borderRadius: this.config.borderRadius,
|
||||
padding: this.config.padding,
|
||||
cropRegion: this.config.cropRegion,
|
||||
videoWidth: videoInfo.width,
|
||||
videoHeight: videoInfo.height,
|
||||
annotationRegions: this.config.annotationRegions,
|
||||
previewWidth: this.config.previewWidth,
|
||||
previewHeight: this.config.previewHeight,
|
||||
});
|
||||
await this.renderer.initialize();
|
||||
|
||||
// Initialize GIF encoder
|
||||
// Loop: 0 = infinite loop, 1 = play once (no loop)
|
||||
const repeat = this.config.loop ? 0 : 1;
|
||||
|
||||
this.gif = new GIF({
|
||||
workers: 4,
|
||||
quality: 10,
|
||||
width: this.config.width,
|
||||
height: this.config.height,
|
||||
workerScript: GIF_WORKER_URL,
|
||||
repeat,
|
||||
background: '#000000',
|
||||
transparent: null,
|
||||
dither: 'FloydSteinberg',
|
||||
});
|
||||
|
||||
// Get the video element for frame extraction
|
||||
const videoElement = this.decoder.getVideoElement();
|
||||
if (!videoElement) {
|
||||
throw new Error('Video element not available');
|
||||
}
|
||||
|
||||
// Calculate effective duration and frame count (excluding trim regions)
|
||||
const effectiveDuration = this.getEffectiveDuration(videoInfo.duration);
|
||||
const totalFrames = Math.ceil(effectiveDuration * this.config.frameRate);
|
||||
|
||||
// Calculate frame delay in milliseconds (gif.js uses ms)
|
||||
const frameDelay = Math.round(1000 / this.config.frameRate);
|
||||
|
||||
console.log('[GifExporter] Original duration:', videoInfo.duration, 's');
|
||||
console.log('[GifExporter] Effective duration:', effectiveDuration, 's');
|
||||
console.log('[GifExporter] Total frames to export:', totalFrames);
|
||||
console.log('[GifExporter] Frame rate:', this.config.frameRate, 'FPS');
|
||||
console.log('[GifExporter] Frame delay:', frameDelay, 'ms');
|
||||
console.log('[GifExporter] Loop:', this.config.loop ? 'infinite' : 'once');
|
||||
|
||||
// Process frames
|
||||
const timeStep = 1 / this.config.frameRate;
|
||||
let frameIndex = 0;
|
||||
|
||||
while (frameIndex < totalFrames && !this.cancelled) {
|
||||
const i = frameIndex;
|
||||
const timestamp = i * (1_000_000 / this.config.frameRate); // in microseconds
|
||||
|
||||
// Map effective time to source time (accounting for trim regions)
|
||||
const effectiveTimeMs = (i * timeStep) * 1000;
|
||||
const sourceTimeMs = this.mapEffectiveToSourceTime(effectiveTimeMs);
|
||||
const videoTime = sourceTimeMs / 1000;
|
||||
|
||||
// Seek if needed
|
||||
const needsSeek = Math.abs(videoElement.currentTime - videoTime) > 0.001;
|
||||
|
||||
if (needsSeek) {
|
||||
const seekedPromise = new Promise<void>(resolve => {
|
||||
videoElement.addEventListener('seeked', () => resolve(), { once: true });
|
||||
});
|
||||
|
||||
videoElement.currentTime = videoTime;
|
||||
await seekedPromise;
|
||||
} else if (i === 0) {
|
||||
// Only for the very first frame, wait for it to be ready
|
||||
await new Promise<void>(resolve => {
|
||||
videoElement.requestVideoFrameCallback(() => resolve());
|
||||
});
|
||||
}
|
||||
|
||||
// Create a VideoFrame from the video element
|
||||
const videoFrame = new VideoFrame(videoElement, {
|
||||
timestamp,
|
||||
});
|
||||
|
||||
// Render the frame with all effects using source timestamp
|
||||
const sourceTimestamp = sourceTimeMs * 1000; // Convert to microseconds
|
||||
await this.renderer!.renderFrame(videoFrame, sourceTimestamp);
|
||||
|
||||
videoFrame.close();
|
||||
|
||||
// Get the rendered canvas and add to GIF
|
||||
const canvas = this.renderer!.getCanvas();
|
||||
|
||||
// Add frame to GIF encoder with delay
|
||||
this.gif!.addFrame(canvas, { delay: frameDelay, copy: true });
|
||||
|
||||
frameIndex++;
|
||||
|
||||
// Update progress
|
||||
if (this.config.onProgress) {
|
||||
this.config.onProgress({
|
||||
currentFrame: frameIndex,
|
||||
totalFrames,
|
||||
percentage: (frameIndex / totalFrames) * 100,
|
||||
estimatedTimeRemaining: 0,
|
||||
});
|
||||
}
|
||||
}
|
||||
|
||||
if (this.cancelled) {
|
||||
return { success: false, error: 'Export cancelled' };
|
||||
}
|
||||
|
||||
// Update progress to show we're now in the finalizing phase
|
||||
if (this.config.onProgress) {
|
||||
this.config.onProgress({
|
||||
currentFrame: totalFrames,
|
||||
totalFrames,
|
||||
percentage: 100,
|
||||
estimatedTimeRemaining: 0,
|
||||
phase: 'finalizing',
|
||||
});
|
||||
}
|
||||
|
||||
// Render the GIF
|
||||
const blob = await new Promise<Blob>((resolve, reject) => {
|
||||
this.gif!.on('finished', (blob: Blob) => {
|
||||
resolve(blob);
|
||||
});
|
||||
|
||||
// Track rendering progress
|
||||
this.gif!.on('progress', (progress: number) => {
|
||||
if (this.config.onProgress) {
|
||||
this.config.onProgress({
|
||||
currentFrame: totalFrames,
|
||||
totalFrames,
|
||||
percentage: 100,
|
||||
estimatedTimeRemaining: 0,
|
||||
phase: 'finalizing',
|
||||
renderProgress: Math.round(progress * 100),
|
||||
});
|
||||
}
|
||||
});
|
||||
|
||||
// gif.js doesn't have a typed 'error' event, but we can catch errors in the try/catch
|
||||
this.gif!.render();
|
||||
});
|
||||
|
||||
return { success: true, blob };
|
||||
} catch (error) {
|
||||
console.error('GIF Export error:', error);
|
||||
return {
|
||||
success: false,
|
||||
error: error instanceof Error ? error.message : String(error),
|
||||
};
|
||||
} finally {
|
||||
this.cleanup();
|
||||
}
|
||||
}
|
||||
|
||||
cancel(): void {
|
||||
this.cancelled = true;
|
||||
if (this.gif) {
|
||||
this.gif.abort();
|
||||
}
|
||||
this.cleanup();
|
||||
}
|
||||
|
||||
private cleanup(): void {
|
||||
if (this.decoder) {
|
||||
try {
|
||||
this.decoder.destroy();
|
||||
} catch (e) {
|
||||
console.warn('Error destroying decoder:', e);
|
||||
}
|
||||
this.decoder = null;
|
||||
}
|
||||
|
||||
if (this.renderer) {
|
||||
try {
|
||||
this.renderer.destroy();
|
||||
} catch (e) {
|
||||
console.warn('Error destroying renderer:', e);
|
||||
}
|
||||
this.renderer = null;
|
||||
}
|
||||
|
||||
this.gif = null;
|
||||
}
|
||||
}
|
||||
@@ -2,5 +2,23 @@ export { VideoExporter } from './videoExporter';
|
||||
export { VideoFileDecoder } from './videoDecoder';
|
||||
export { FrameRenderer } from './frameRenderer';
|
||||
export { VideoMuxer } from './muxer';
|
||||
export type { ExportConfig, ExportProgress, ExportResult, VideoFrameData, ExportQuality } from './types';
|
||||
export { GifExporter, calculateOutputDimensions } from './gifExporter';
|
||||
export type {
|
||||
ExportConfig,
|
||||
ExportProgress,
|
||||
ExportResult,
|
||||
VideoFrameData,
|
||||
ExportQuality,
|
||||
ExportFormat,
|
||||
GifFrameRate,
|
||||
GifSizePreset,
|
||||
GifExportConfig,
|
||||
ExportSettings,
|
||||
} from './types';
|
||||
export {
|
||||
GIF_SIZE_PRESETS,
|
||||
GIF_FRAME_RATES,
|
||||
VALID_GIF_FRAME_RATES,
|
||||
isValidGifFrameRate
|
||||
} from './types';
|
||||
|
||||
|
||||
@@ -0,0 +1,63 @@
|
||||
import { describe, it, expect } from 'vitest';
|
||||
import * as fc from 'fast-check';
|
||||
import {
|
||||
isValidGifFrameRate,
|
||||
VALID_GIF_FRAME_RATES,
|
||||
GifFrameRate
|
||||
} from './types';
|
||||
|
||||
/**
|
||||
* Property 1: Valid Frame Rate Acceptance
|
||||
*
|
||||
* *For any* frame rate value, the GIF_Exporter SHALL accept it if and only if
|
||||
* it is one of the valid presets (10, 15, 20, 25, 30 FPS). Invalid frame rates
|
||||
* should be rejected with an error.
|
||||
*
|
||||
* **Validates: Requirements 2.2**
|
||||
*
|
||||
* Feature: gif-export, Property 1: Valid Frame Rate Acceptance
|
||||
*/
|
||||
describe('GIF Export Types', () => {
|
||||
describe('Property 1: Valid Frame Rate Acceptance', () => {
|
||||
// Property test: Valid frame rates should be accepted
|
||||
it('should accept all valid frame rates (10, 15, 20, 25, 30)', () => {
|
||||
fc.assert(
|
||||
fc.property(
|
||||
fc.constantFrom(...VALID_GIF_FRAME_RATES),
|
||||
(frameRate: GifFrameRate) => {
|
||||
expect(isValidGifFrameRate(frameRate)).toBe(true);
|
||||
}
|
||||
),
|
||||
{ numRuns: 100 }
|
||||
);
|
||||
});
|
||||
|
||||
// Property test: Invalid frame rates should be rejected
|
||||
it('should reject any frame rate not in the valid set', () => {
|
||||
fc.assert(
|
||||
fc.property(
|
||||
fc.integer().filter(n => !VALID_GIF_FRAME_RATES.includes(n as GifFrameRate)),
|
||||
(invalidFrameRate: number) => {
|
||||
expect(isValidGifFrameRate(invalidFrameRate)).toBe(false);
|
||||
}
|
||||
),
|
||||
{ numRuns: 100 }
|
||||
);
|
||||
});
|
||||
|
||||
// Property test: Frame rate validation is deterministic
|
||||
it('should return consistent results for the same input', () => {
|
||||
fc.assert(
|
||||
fc.property(
|
||||
fc.integer({ min: 1, max: 60 }),
|
||||
(frameRate: number) => {
|
||||
const result1 = isValidGifFrameRate(frameRate);
|
||||
const result2 = isValidGifFrameRate(frameRate);
|
||||
expect(result1).toBe(result2);
|
||||
}
|
||||
),
|
||||
{ numRuns: 100 }
|
||||
);
|
||||
});
|
||||
});
|
||||
});
|
||||
@@ -11,6 +11,8 @@ export interface ExportProgress {
|
||||
totalFrames: number;
|
||||
percentage: number;
|
||||
estimatedTimeRemaining: number; // in seconds
|
||||
phase?: 'extracting' | 'finalizing'; // Phase of export
|
||||
renderProgress?: number; // 0-100, progress of GIF rendering phase
|
||||
}
|
||||
|
||||
export interface ExportResult {
|
||||
@@ -26,3 +28,48 @@ export interface VideoFrameData {
|
||||
}
|
||||
|
||||
export type ExportQuality = 'medium' | 'good' | 'source';
|
||||
|
||||
// GIF Export Types
|
||||
export type ExportFormat = 'mp4' | 'gif';
|
||||
|
||||
export type GifFrameRate = 10 | 15 | 20 | 25 | 30;
|
||||
|
||||
export type GifSizePreset = 'small' | 'medium' | 'large' | 'original';
|
||||
|
||||
export interface GifExportConfig {
|
||||
frameRate: GifFrameRate;
|
||||
loop: boolean;
|
||||
sizePreset: GifSizePreset;
|
||||
width: number;
|
||||
height: number;
|
||||
}
|
||||
|
||||
export interface ExportSettings {
|
||||
format: ExportFormat;
|
||||
// MP4 settings
|
||||
quality?: ExportQuality;
|
||||
// GIF settings
|
||||
gifConfig?: GifExportConfig;
|
||||
}
|
||||
|
||||
export const GIF_SIZE_PRESETS: Record<GifSizePreset, { maxHeight: number; label: string }> = {
|
||||
small: { maxHeight: 480, label: 'Small (480p)' },
|
||||
medium: { maxHeight: 720, label: 'Medium (720p)' },
|
||||
large: { maxHeight: 1080, label: 'Large (1080p)' },
|
||||
original: { maxHeight: Infinity, label: 'Original' },
|
||||
};
|
||||
|
||||
export const GIF_FRAME_RATES: { value: GifFrameRate; label: string }[] = [
|
||||
{ value: 10, label: '10 FPS - Smaller file' },
|
||||
{ value: 15, label: '15 FPS - Balanced' },
|
||||
{ value: 20, label: '20 FPS - Smooth' },
|
||||
{ value: 25, label: '25 FPS - Very smooth' },
|
||||
{ value: 30, label: '30 FPS - Maximum' },
|
||||
];
|
||||
|
||||
// Valid frame rates for validation
|
||||
export const VALID_GIF_FRAME_RATES: readonly GifFrameRate[] = [10, 15, 20, 25, 30] as const;
|
||||
|
||||
export function isValidGifFrameRate(rate: number): rate is GifFrameRate {
|
||||
return VALID_GIF_FRAME_RATES.includes(rate as GifFrameRate);
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user