Video compression in composer (#4638)

Co-authored-by: Samuel Newman <10959775+mozzius@users.noreply.github.com>
Co-authored-by: Hailey <me@haileyok.com>

src/lib/media/video/compress.ts

@@ -0,0 +1,30 @@
+import {getVideoMetaData, Video} from 'react-native-compressor'
+
+export type CompressedVideo = {
+  uri: string
+  size: number
+}
+
+export async function compressVideo(
+  file: string,
+  opts?: {
+    getCancellationId?: (id: string) => void
+    onProgress?: (progress: number) => void
+  },
+): Promise<CompressedVideo> {
+  const {onProgress, getCancellationId} = opts || {}
+
+  const compressed = await Video.compress(
+    file,
+    {
+      getCancellationId,
+      compressionMethod: 'manual',
+      bitrate: 3_000_000, // 3mbps
+      maxSize: 1920,
+    },
+    onProgress,
+  )
+
+  const info = await getVideoMetaData(compressed)
+  return {uri: compressed, size: info.size}
+}

src/lib/media/video/compress.web.ts

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+import {VideoTooLargeError} from 'lib/media/video/errors'
+
+const MAX_VIDEO_SIZE = 1024 * 1024 * 100 // 100MB
+
+export type CompressedVideo = {
+  uri: string
+  size: number
+}
+
+// doesn't actually compress, but throws if >100MB
+export async function compressVideo(
+  file: string,
+  _callbacks?: {
+    onProgress: (progress: number) => void
+  },
+): Promise<CompressedVideo> {
+  const blob = await fetch(file).then(res => res.blob())
+  const video = URL.createObjectURL(blob)
+
+  if (blob.size > MAX_VIDEO_SIZE) {
+    throw new VideoTooLargeError()
+  }
+
+  return {
+    size: blob.size,
+    uri: video,
+  }
+}

src/lib/media/video/errors.ts

@@ -0,0 +1,6 @@
+export class VideoTooLargeError extends Error {
+  constructor() {
+    super('Videos cannot be larger than 100MB')
+    this.name = 'VideoTooLargeError'
+  }
+}