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, | |
| 8dd754c7 | 9 | [VideoResolution.H_144P]: 0.19, |
| 679c12e6 C |
10 | [VideoResolution.H_240P]: 0.17, |
| 11 | [VideoResolution.H_360P]: 0.15, | |
| 12 | [VideoResolution.H_480P]: 0.12, | |
| 13 | [VideoResolution.H_720P]: 0.11, | |
| 14 | [VideoResolution.H_1080P]: 0.10, | |
| 15 | [VideoResolution.H_1440P]: 0.09, | |
| 16 | [VideoResolution.H_4K]: 0.08 | |
| 17 | } | |
| 18 | ||
| 19 | const maxBitPerPixel: BitPerPixel = { | |
| 20 | [VideoResolution.H_NOVIDEO]: 0, | |
| 8dd754c7 | 21 | [VideoResolution.H_144P]: 0.32, |
| 679c12e6 C |
22 | [VideoResolution.H_240P]: 0.29, |
| 23 | [VideoResolution.H_360P]: 0.26, | |
| 24 | [VideoResolution.H_480P]: 0.22, | |
| 25 | [VideoResolution.H_720P]: 0.19, | |
| 26 | [VideoResolution.H_1080P]: 0.17, | |
| 27 | [VideoResolution.H_1440P]: 0.16, | |
| 28 | [VideoResolution.H_4K]: 0.14 | |
| 29 | } | |
| 30 | ||
| 31 | function getAverageBitrate (options: { | |
| 32 | resolution: VideoResolution | |
| 33 | ratio: number | |
| 34 | fps: number | |
| 35 | }) { | |
| 36 | const targetBitrate = calculateBitrate({ ...options, bitPerPixel: averageBitPerPixel }) | |
| 37 | if (!targetBitrate) return 192 * 1000 | |
| 38 | ||
| 39 | return targetBitrate | |
| 40 | } | |
| 41 | ||
| 42 | function getMaxBitrate (options: { | |
| 43 | resolution: VideoResolution | |
| 44 | ratio: number | |
| 45 | fps: number | |
| 46 | }) { | |
| 47 | const targetBitrate = calculateBitrate({ ...options, bitPerPixel: maxBitPerPixel }) | |
| 48 | if (!targetBitrate) return 256 * 1000 | |
| 49 | ||
| 50 | return targetBitrate | |
| 51 | } | |
| 52 | ||
| 53 | // --------------------------------------------------------------------------- | |
| 54 | ||
| 55 | export { | |
| 56 | getAverageBitrate, | |
| 57 | getMaxBitrate | |
| 58 | } | |
| 59 | ||
| 60 | // --------------------------------------------------------------------------- | |
| 61 | ||
| 62 | function calculateBitrate (options: { | |
| 63 | bitPerPixel: BitPerPixel | |
| 64 | resolution: VideoResolution | |
| 65 | ratio: number | |
| 66 | fps: number | |
| 67 | }) { | |
| 68 | const { bitPerPixel, resolution, ratio, fps } = options | |
| 69 | ||
| 70 | const resolutionsOrder = [ | |
| 71 | VideoResolution.H_4K, | |
| 72 | VideoResolution.H_1440P, | |
| 73 | VideoResolution.H_1080P, | |
| 74 | VideoResolution.H_720P, | |
| 75 | VideoResolution.H_480P, | |
| 76 | VideoResolution.H_360P, | |
| 77 | VideoResolution.H_240P, | |
| 8dd754c7 | 78 | VideoResolution.H_144P, |
| 679c12e6 C |
79 | VideoResolution.H_NOVIDEO |
| 80 | ] | |
| 81 | ||
| 82 | for (const toTestResolution of resolutionsOrder) { | |
| 83 | if (toTestResolution <= resolution) { | |
| 9f430a53 | 84 | return Math.floor(resolution * resolution * ratio * fps * bitPerPixel[toTestResolution]) |
| 679c12e6 C |
85 | } |
| 86 | } | |
| 87 | ||
| 88 | throw new Error('Unknown resolution ' + resolution) | |
| 89 | } |