| | | 1 | | #nullable disable |
| | | 2 | | #pragma warning disable CS1591 |
| | | 3 | | |
| | | 4 | | using System; |
| | | 5 | | using System.Linq; |
| | | 6 | | |
| | | 7 | | namespace MediaBrowser.Model.Dlna |
| | | 8 | | { |
| | | 9 | | public static class ResolutionNormalizer |
| | | 10 | | { |
| | | 11 | | // Please note: all bitrate here are in the scale of SDR h264 bitrate at 30fps |
| | 0 | 12 | | private static readonly ResolutionConfiguration[] _configurations = |
| | 0 | 13 | | [ |
| | 0 | 14 | | new ResolutionConfiguration(416, 365000), |
| | 0 | 15 | | new ResolutionConfiguration(640, 730000), |
| | 0 | 16 | | new ResolutionConfiguration(768, 1100000), |
| | 0 | 17 | | new ResolutionConfiguration(960, 3000000), |
| | 0 | 18 | | new ResolutionConfiguration(1280, 6000000), |
| | 0 | 19 | | new ResolutionConfiguration(1920, 13500000), |
| | 0 | 20 | | new ResolutionConfiguration(2560, 28000000), |
| | 0 | 21 | | new ResolutionConfiguration(3840, 50000000) |
| | 0 | 22 | | ]; |
| | | 23 | | |
| | | 24 | | public static ResolutionOptions Normalize( |
| | | 25 | | int? inputBitrate, |
| | | 26 | | int outputBitrate, |
| | | 27 | | int h264EquivalentOutputBitrate, |
| | | 28 | | int? maxWidth, |
| | | 29 | | int? maxHeight, |
| | | 30 | | float? targetFps, |
| | | 31 | | bool isHdr = false) // We are not doing HDR transcoding for now, leave for future use |
| | | 32 | | { |
| | | 33 | | // If the bitrate isn't changing, then don't downscale the resolution |
| | 0 | 34 | | if (inputBitrate.HasValue && outputBitrate >= inputBitrate.Value) |
| | | 35 | | { |
| | 0 | 36 | | if (maxWidth.HasValue || maxHeight.HasValue) |
| | | 37 | | { |
| | 0 | 38 | | return new ResolutionOptions |
| | 0 | 39 | | { |
| | 0 | 40 | | MaxWidth = maxWidth, |
| | 0 | 41 | | MaxHeight = maxHeight |
| | 0 | 42 | | }; |
| | | 43 | | } |
| | | 44 | | } |
| | | 45 | | |
| | | 46 | | // Our reference bitrate is based on SDR h264 at 30fps |
| | 0 | 47 | | var referenceFps = targetFps ?? 30.0f; |
| | 0 | 48 | | var referenceScale = referenceFps <= 30.0f |
| | 0 | 49 | | ? 30.0f / referenceFps |
| | 0 | 50 | | : 1.0f / MathF.Sqrt(referenceFps / 30.0f); |
| | 0 | 51 | | var referenceBitrate = h264EquivalentOutputBitrate * referenceScale; |
| | | 52 | | |
| | 0 | 53 | | if (isHdr) |
| | | 54 | | { |
| | 0 | 55 | | referenceBitrate *= 0.8f; |
| | | 56 | | } |
| | | 57 | | |
| | 0 | 58 | | var resolutionConfig = GetResolutionConfiguration(Convert.ToInt32(referenceBitrate)); |
| | | 59 | | |
| | 0 | 60 | | if (resolutionConfig is null) |
| | | 61 | | { |
| | 0 | 62 | | return new ResolutionOptions { MaxWidth = maxWidth, MaxHeight = maxHeight }; |
| | | 63 | | } |
| | | 64 | | |
| | 0 | 65 | | var originWidthValue = maxWidth; |
| | | 66 | | |
| | 0 | 67 | | maxWidth = Math.Min(resolutionConfig.MaxWidth, maxWidth ?? resolutionConfig.MaxWidth); |
| | 0 | 68 | | if (!originWidthValue.HasValue || originWidthValue.Value != maxWidth.Value) |
| | | 69 | | { |
| | 0 | 70 | | maxHeight = null; |
| | | 71 | | } |
| | | 72 | | |
| | 0 | 73 | | return new ResolutionOptions |
| | 0 | 74 | | { |
| | 0 | 75 | | MaxWidth = maxWidth, |
| | 0 | 76 | | MaxHeight = maxHeight |
| | 0 | 77 | | }; |
| | | 78 | | } |
| | | 79 | | |
| | | 80 | | private static ResolutionConfiguration GetResolutionConfiguration(int outputBitrate) |
| | | 81 | | { |
| | 0 | 82 | | return _configurations.FirstOrDefault(config => outputBitrate <= config.MaxBitrate); |
| | | 83 | | } |
| | | 84 | | } |
| | | 85 | | } |