projects / github / Chocobozzz / PeerTube.git / blame
| Commit | Line | Data |
|---|---|---|
| 679c12e6 C |
1 | import { VideoResolution } from "@shared/models" |
| 2 | ||
| 3 | type BitPerPixel = { [ id in VideoResolution ]: number } | |
| 4 | ||
| 5 | // https://bitmovin.com/video-bitrate-streaming-hls-dash/ | |
| 6 | ||
| 7 | const averageBitPerPixel: BitPerPixel = { | |
| 8 | [VideoResolution.H_NOVIDEO]: 0, | |
| 9 | [VideoResolution.H_240P]: 0.17, | |
| 10 | [VideoResolution.H_360P]: 0.15, | |
| 11 | [VideoResolution.H_480P]: 0.12, | |
| 12 | [VideoResolution.H_720P]: 0.11, | |
| 13 | [VideoResolution.H_1080P]: 0.10, | |
| 14 | [VideoResolution.H_1440P]: 0.09, | |
| 15 | [VideoResolution.H_4K]: 0.08 | |
| 16 | } | |
| 17 | ||
| 18 | const maxBitPerPixel: BitPerPixel = { | |
| 19 | [VideoResolution.H_NOVIDEO]: 0, | |
| 20 | [VideoResolution.H_240P]: 0.29, | |
| 21 | [VideoResolution.H_360P]: 0.26, | |
| 22 | [VideoResolution.H_480P]: 0.22, | |
| 23 | [VideoResolution.H_720P]: 0.19, | |
| 24 | [VideoResolution.H_1080P]: 0.17, | |
| 25 | [VideoResolution.H_1440P]: 0.16, | |
| 26 | [VideoResolution.H_4K]: 0.14 | |
| 27 | } | |
| 28 | ||
| 29 | function getAverageBitrate (options: { | |
| 30 | resolution: VideoResolution | |
| 31 | ratio: number | |
| 32 | fps: number | |
| 33 | }) { | |
| 34 | const targetBitrate = calculateBitrate({ ...options, bitPerPixel: averageBitPerPixel }) | |
| 35 | if (!targetBitrate) return 192 * 1000 | |
| 36 | ||
| 37 | return targetBitrate | |
| 38 | } | |
| 39 | ||
| 40 | function getMaxBitrate (options: { | |
| 41 | resolution: VideoResolution | |
| 42 | ratio: number | |
| 43 | fps: number | |
| 44 | }) { | |
| 45 | const targetBitrate = calculateBitrate({ ...options, bitPerPixel: maxBitPerPixel }) | |
| 46 | if (!targetBitrate) return 256 * 1000 | |
| 47 | ||
| 48 | return targetBitrate | |
| 49 | } | |
| 50 | ||
| 51 | // --------------------------------------------------------------------------- | |
| 52 | ||
| 53 | export { | |
| 54 | getAverageBitrate, | |
| 55 | getMaxBitrate | |
| 56 | } | |
| 57 | ||
| 58 | // --------------------------------------------------------------------------- | |
| 59 | ||
| 60 | function calculateBitrate (options: { | |
| 61 | bitPerPixel: BitPerPixel | |
| 62 | resolution: VideoResolution | |
| 63 | ratio: number | |
| 64 | fps: number | |
| 65 | }) { | |
| 66 | const { bitPerPixel, resolution, ratio, fps } = options | |
| 67 | ||
| 68 | const resolutionsOrder = [ | |
| 69 | VideoResolution.H_4K, | |
| 70 | VideoResolution.H_1440P, | |
| 71 | VideoResolution.H_1080P, | |
| 72 | VideoResolution.H_720P, | |
| 73 | VideoResolution.H_480P, | |
| 74 | VideoResolution.H_360P, | |
| 75 | VideoResolution.H_240P, | |
| 76 | VideoResolution.H_NOVIDEO | |
| 77 | ] | |
| 78 | ||
| 79 | for (const toTestResolution of resolutionsOrder) { | |
| 80 | if (toTestResolution <= resolution) { | |
| 81 | return resolution * resolution * ratio * fps * bitPerPixel[toTestResolution] | |
| 82 | } | |
| 83 | } | |
| 84 | ||
| 85 | throw new Error('Unknown resolution ' + resolution) | |
| 86 | } |