Add software tonemap filter support

[gnattu]

This adds a fast SIMD optimized software tonemap filter support to the server. This filter currently does not support dolby vision reshaping and only support HDR10 and HLG inputs. With current veryfast libx264 settings we can expect 4K60 transcoding+tone mapping on a modern processor with 8 cores equivalent to Zen3/Golden Cove/Firestorm level performance.

Changes

• Add tonemapx filter support to software transcode pipeline
• Add tonemapx filter support to thumbnail generation pipeline

Issues

Depends on ffmpeg pr jellyfin/jellyfin-ffmpeg#407

The perf figures in the original post only reflects the initial implementation. The finalized perf figures are here: jellyfin/jellyfin-ffmpeg#407 (comment)

[nyanmisaka]

Are these checks duplicated?

|| !(string.Equals(state.VideoStream?.ColorTransfer, "smpte2084", StringComparison.OrdinalIgnoreCase) || string.Equals(state.VideoStream?.ColorTransfer, "arib-std-b67", StringComparison.OrdinalIgnoreCase)))

            return state.VideoStream.VideoRange == VideoRange.HDR
                   && state.VideoStream.VideoRangeType is VideoRangeType.HDR10 or VideoRangeType.HLG or VideoRangeType.DOVIWithHDR10 or VideoRangeType.DOVIWithHLG;

[gnattu]

The former checks for all supported HDR curves and the latter filters out Dolby vision videos without fallback profiles. Only checks for the latter should be enough but we are doing this double check for hardware tone mapping as well.

[nyanmisaka]

jellyfin/MediaBrowser.Model/Entities/MediaStream.cs

Lines 703 to 755 in eb45a36

	public (VideoRange VideoRange, VideoRangeType VideoRangeType) GetVideoColorRange()
	{
	if (Type != MediaStreamType.Video)
	{
	return (VideoRange.Unknown, VideoRangeType.Unknown);
	}
	var codecTag = CodecTag;
	var dvProfile = DvProfile;
	var rpuPresentFlag = RpuPresentFlag == 1;
	var blPresentFlag = BlPresentFlag == 1;
	var dvBlCompatId = DvBlSignalCompatibilityId;
	var isDoViProfile = dvProfile == 5 || dvProfile == 7 || dvProfile == 8;
	var isDoViFlag = rpuPresentFlag && blPresentFlag && (dvBlCompatId == 0 || dvBlCompatId == 1 || dvBlCompatId == 4 || dvBlCompatId == 2 || dvBlCompatId == 6);
	if ((isDoViProfile && isDoViFlag)
	|| string.Equals(codecTag, "dovi", StringComparison.OrdinalIgnoreCase)
	|| string.Equals(codecTag, "dvh1", StringComparison.OrdinalIgnoreCase)
	|| string.Equals(codecTag, "dvhe", StringComparison.OrdinalIgnoreCase)
	|| string.Equals(codecTag, "dav1", StringComparison.OrdinalIgnoreCase))
	{
	return dvProfile switch
	{
	5 => (VideoRange.HDR, VideoRangeType.DOVI),
	8 => dvBlCompatId switch
	{
	1 => (VideoRange.HDR, VideoRangeType.DOVIWithHDR10),
	4 => (VideoRange.HDR, VideoRangeType.DOVIWithHLG),
	2 => (VideoRange.SDR, VideoRangeType.DOVIWithSDR),
	// While not in Dolby Spec, Profile 8 CCid 6 media are possible to create, and since CCid 6 stems from Bluray (Profile 7 originally) an HDR10 base layer is guaranteed to exist.
	6 => (VideoRange.HDR, VideoRangeType.DOVIWithHDR10),
	// There is no other case to handle here as per Dolby Spec. Default case included for completeness and linting purposes
	_ => (VideoRange.SDR, VideoRangeType.SDR)
	},
	7 => (VideoRange.HDR, VideoRangeType.HDR10),
	_ => (VideoRange.SDR, VideoRangeType.SDR)
	};
	}
	var colorTransfer = ColorTransfer;
	if (string.Equals(colorTransfer, "smpte2084", StringComparison.OrdinalIgnoreCase))
	{
	return (VideoRange.HDR, VideoRangeType.HDR10);
	}
	else if (string.Equals(colorTransfer, "arib-std-b67", StringComparison.OrdinalIgnoreCase))
	{
	return (VideoRange.HDR, VideoRangeType.HLG);
	}
	return (VideoRange.SDR, VideoRangeType.SDR);
	}

ColorTransfer is normalized to VideoRange and VideoRangeType. We should eventually avoid using ColorTransfer directly.

[nyanmisaka]

Speaking of Golden Cove, let's hope that the flagship models in Raptor Lake don't crash in our AVX2 code.