| 106 | } |
| 107 | |
| 108 | async function getWorkerFirstAndLastFrame( |
| 109 | firstGlobalFrame: number, |
| 110 | lastGlobalFrame: number, |
| 111 | workerId: number, |
| 112 | totalNumOfWorkers: number, |
| 113 | ) { |
| 114 | const videoDurationInFrames = lastGlobalFrame - firstGlobalFrame; |
| 115 | const framesPerWorker = Math.ceil(videoDurationInFrames / totalNumOfWorkers); |
| 116 | |
| 117 | const offset = workerId === 0 ? 0 : 1; |
| 118 | const firstWorkerFrame = |
| 119 | firstGlobalFrame + framesPerWorker * workerId + offset; |
| 120 | const lastWorkerFrame = Math.min( |
| 121 | firstWorkerFrame + framesPerWorker - offset, |
| 122 | lastGlobalFrame, |
| 123 | ); |
| 124 | |
| 125 | return {firstWorkerFrame, lastWorkerFrame}; |
| 126 | } |