mirror of
https://github.com/wader/fq.git
synced 2024-12-19 19:31:37 +03:00
1833 lines
52 KiB
Go
1833 lines
52 KiB
Go
package mp4
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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"time"
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"github.com/wader/fq/format"
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"github.com/wader/fq/pkg/decode"
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"github.com/wader/fq/pkg/scalar"
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"golang.org/x/text/encoding/charmap"
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)
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// TODO: keep track of list of sampleSize/entries instead and change sample read code
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const maxSampleEntryCount = 10_000_000
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const (
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boxSizeRestOfFile = 0
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boxSizeUse64bitSize = 1
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)
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var boxSizeNames = scalar.UintMapDescription{
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boxSizeRestOfFile: "Rest of file",
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boxSizeUse64bitSize: "Use 64 bit size",
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}
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var mediaTimeNames = scalar.SintMapDescription{
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-1: "empty",
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}
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var subTypeNames = scalar.StrMapDescription{
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"alis": "Alias Data",
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"camm": "Camera Metadata",
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"crsm": "Clock Reference",
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"data": "Data",
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"hint": "Hint Track",
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"ipsm": "IPMP",
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"m7sm": "MPEG-7 Stream",
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"mdir": "Metadata",
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"mdta": "Metadata Tags",
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"meta": "NRT Metadata",
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"mjsm": "MPEG-J",
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"nrtm": "Non-Real Time Metadata",
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"ocsm": "Object Content",
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"odsm": "Object Descriptor",
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"pict": "Picture",
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"priv": "Private",
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"psmd": "Panasonic Static Metadata",
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"sbtl": "Subtitle",
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"sdsm": "Scene Description",
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"soun": "Audio Track",
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"subp": "Subpicture",
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"text": "Text",
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"tmcd": "Time Code",
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"url ": "URL",
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"vide": "Video Track",
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}
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var dataFormatNames = scalar.StrMapDescription{
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// additional codecs
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"apch": "Apple ProRes 422 High Quality",
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"apcn": "Apple ProRes 422 Standard Definition",
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"apcs": "Apple ProRes 422 LT",
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"apco": "Apple ProRes 422 Proxy",
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"ap4h": "Apple ProRes 4444",
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"jpeg": "JPEG Image",
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// codecs from https://mp4ra.org/
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"3gvo": "3GPP Video Orientation",
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"a3d1": "Multiview Video Coding",
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"a3d2": "Multiview Video Coding",
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"a3d3": "Multiview Video Coding",
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"a3d4": "Multiview Video Coding",
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"a3ds": "Auro-Cx 3D audio",
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"ac-3": "AC-3 audio",
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"ac-4": "AC-4 audio",
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"alac": "Apple lossless audio codec",
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"alaw": "a-Law",
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"av01": "AV1 video",
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"avc1": "Advanced Video Coding",
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"avc2": "Advanced Video Coding",
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"avc3": "Advanced Video Coding",
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"avc4": "Advanced Video Coding",
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"avcp": "Advanced Video Coding Parameters",
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"dra1": "DRA Audio",
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"drac": "Dirac Video Coder",
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"dts-": "Dependent base layer for DTS layered audio",
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"dts+": "Enhancement layer for DTS layered audio",
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"dtsc": "DTS Coherent Acoustics audio",
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"dtse": "DTS Express low bit rate audio, also known as DTS LBR",
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"dtsh": "DTS-HD High Resolution Audio",
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"dtsl": "DTS-HD Master Audio",
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"dtsx": "DTS:X",
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"dvav": "AVC-based “Dolby Vision”",
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"dvhe": "HEVC-based “Dolby Vision”",
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"ec-3": "Enhanced AC-3 audio",
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"enca": "Encrypted/Protected audio",
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"encf": "Encrypted/Protected font",
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"encm": "Encrypted/Protected metadata stream",
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"encs": "Encrypted Systems stream",
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"enct": "Encrypted Text",
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"encv": "Encrypted/protected video",
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"fdp ": "File delivery hints",
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"fLaC": "Fres Lossless Audio Codec",
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"g719": "ITU-T Recommendation G.719 (2008)",
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"g726": "ITU-T Recommendation G.726 (1990)",
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"hev1": "High Efficiency Video Coding",
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"hvc1": "High Efficiency Video Coding",
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"hvt1": "High Efficiency Video Coding",
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"ixse": "DVB Track Level Index Track",
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"lhe1": "Layered High Efficiency Video Coding",
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"lht1": "Layered High Efficiency Video Coding",
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"lhv1": "Layered High Efficiency Video Coding",
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"m2ts": "MPEG-2 transport stream for DMB",
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"m4ae": "MPEG-4 Audio Enhancement MP4v1/2",
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"mett": "Text timed metadata that is not XML",
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"metx": "XML timed metadata",
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"mha1": "MPEG-H Audio (single stream, uncapsulated)",
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"mha2": "MPEG-H Audio (multi-stream, unencapsulated)",
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"mhm1": "MPEG-H Audio (single stream, MHAS encapsulated)",
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"mhm2": "MPEG-H Audio (multi-stream, MHAS encapsulated)",
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"mjp2": "Motion JPEG 2000",
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"mlix": "DVB Movie level index track",
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"mlpa": "MLP Audio",
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"mp4a": "MPEG-4 Audio",
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"mp4s": "MPEG-4 Systems",
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"mp4v": "MPEG-4 Visual",
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"mvc1": "Multiview coding",
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"mvc2": "Multiview coding",
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"mvc3": "Multiview coding",
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"mvc4": "Multiview coding",
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"mvd1": "Multiview coding",
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"mvd2": "Multiview coding",
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"mvd3": "Multiview coding",
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"mvd4": "Multiview coding",
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"oksd": "OMA Keys",
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"Opus": "Opus audio coding",
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"pm2t": "Protected MPEG-2 Transport",
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"prtp": "Protected RTP Reception",
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"raw ": "Uncompressed audio",
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"resv": "Restricted Video",
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"rm2t": "MPEG-2 Transport Reception",
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"rrtp": "RTP reception",
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"rsrp": "SRTP Reception",
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"rtmd": "Real Time Metadata Sample Entry(XAVC Format)",
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"rtp ": "RTP Hints",
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"s263": "ITU H.263 video (3GPP format)",
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"samr": "Narrowband AMR voice",
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"sawb": "Wideband AMR voice",
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"sawp": "Extended AMR-WB (AMR-WB+)",
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"sevc": "EVRC Voice",
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"sm2t": "MPEG-2 Transport Server",
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"sqcp": "13K Voice",
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"srtp": "SRTP Hints",
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"ssmv": "SMV Voice",
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"STGS": "Subtitle Sample Entry (HMMP)",
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"stpp": "Subtitles (Timed Text)",
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"svc1": "Scalable Video Coding",
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"svc2": "Scalable Video Coding",
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"svcM": "SVC Metadata",
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"tc64": "64 bit timecode samples",
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"tmcd": "32 bit timecode samples",
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"twos": "Uncompressed 16-bit audio",
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"tx3g": "Timed Text stream",
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"ulaw": "Samples have been compressed using uLaw 2:1.",
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"unid": "Dynamic Range Control (DRC) data",
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"urim": "Binary timed metadata identified by URI",
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"vc-1": "SMPTE VC-1",
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"vp08": "VP8 video",
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"vp09": "VP9 video",
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"wvtt": "WebVTT",
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}
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var (
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uuidIsmlManifestBytes = [16]byte{0xa5, 0xd4, 0x0b, 0x30, 0xe8, 0x14, 0x11, 0xdd, 0xba, 0x2f, 0x08, 0x00, 0x20, 0x0c, 0x9a, 0x66}
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uuidXmpBytes = [16]byte{0xbe, 0x7a, 0xcf, 0xcb, 0x97, 0xa9, 0x42, 0xe8, 0x9c, 0x71, 0x99, 0x94, 0x91, 0xe3, 0xaf, 0xac}
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uuidSphericalBytes = [16]byte{0xff, 0xcc, 0x82, 0x63, 0xf8, 0x55, 0x4a, 0x93, 0x88, 0x14, 0x58, 0x7a, 0x02, 0x52, 0x1f, 0xdd}
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uuidPspUsmtBytes = [16]byte{0x55, 0x53, 0x4d, 0x54, 0x21, 0xd2, 0x4f, 0xce, 0xbb, 0x88, 0x69, 0x5c, 0xfa, 0xc9, 0xc7, 0x40}
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uuidTfxdBytes = [16]byte{0x6d, 0x1d, 0x9b, 0x05, 0x42, 0xd5, 0x44, 0xe6, 0x80, 0xe2, 0x14, 0x1d, 0xaf, 0xf7, 0x57, 0xb2}
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uuidTfrfBytes = [16]byte{0xd4, 0x80, 0x7e, 0xf2, 0xca, 0x39, 0x46, 0x95, 0x8e, 0x54, 0x26, 0xcb, 0x9e, 0x46, 0xa7, 0x9f}
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uuidProfBytes = [16]byte{0x50, 0x52, 0x4f, 0x46, 0x21, 0xd2, 0x4f, 0xce, 0xbb, 0x88, 0x69, 0x5c, 0xfa, 0xc9, 0xc7, 0x40}
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uuidIpodBytes = [16]byte{0x6b, 0x68, 0x40, 0xf2, 0x5f, 0x24, 0x4f, 0xc5, 0xba, 0x39, 0xa5, 0x1b, 0xcf, 0x03, 0x23, 0xf3}
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)
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var uuidNames = scalar.RawBytesMap{
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{Bytes: uuidIsmlManifestBytes[:], Scalar: scalar.BitBuf{Sym: "isml_manifest"}},
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{Bytes: uuidXmpBytes[:], Scalar: scalar.BitBuf{Sym: "xmp"}},
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{Bytes: uuidSphericalBytes[:], Scalar: scalar.BitBuf{Sym: "spherical"}},
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{Bytes: uuidPspUsmtBytes[:], Scalar: scalar.BitBuf{Sym: "psp_usmt"}},
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{Bytes: uuidTfxdBytes[:], Scalar: scalar.BitBuf{Sym: "tfxd"}},
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{Bytes: uuidTfrfBytes[:], Scalar: scalar.BitBuf{Sym: "tfrf"}},
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{Bytes: uuidProfBytes[:], Scalar: scalar.BitBuf{Sym: "prof"}},
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{Bytes: uuidIpodBytes[:], Scalar: scalar.BitBuf{Sym: "ipod"}},
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}
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// ISO 639-2/T language code 3 * 5bit packed uint + 1 zero bit
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func decodeLang(d *decode.D) string {
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d.U1()
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return string([]byte{
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byte(d.U5()) + 0x60,
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byte(d.U5()) + 0x60,
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byte(d.U5()) + 0x60},
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)
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}
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// Quicktime time seconds in January 1, 1904 UTC
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var quicktimeEpochDate = time.Date(1904, time.January, 1, 0, 0, 0, 0, time.UTC)
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var uintActualQuicktimeEpochDescription = scalar.UintActualDateDescription(quicktimeEpochDate, time.Second, time.RFC3339)
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func decodeMvhdFieldMatrix(d *decode.D, name string) {
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d.FieldStruct(name, func(d *decode.D) {
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d.FieldFP32("a")
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d.FieldFP32("b")
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d.FieldFP("u", 32, 30)
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d.FieldFP32("c")
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d.FieldFP32("d")
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d.FieldFP("v", 32, 30)
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d.FieldFP32("x")
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d.FieldFP32("y")
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d.FieldFP("w", 32, 30)
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})
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}
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// ISO 14496-12 8.40.2.3 Sample dependency box semantics
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func decodeSampleFlags(d *decode.D) {
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d.FieldU4("reserved0")
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d.FieldU2("is_leading")
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d.FieldU2("sample_depends_on", scalar.UintMap{
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0: scalar.Uint{Sym: "unknown"},
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1: scalar.Uint{Sym: "other", Description: "Not I-picture"},
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2: scalar.Uint{Sym: "none", Description: "Is I-picture"},
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})
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d.FieldU2("sample_is_depended_on", scalar.UintMap{
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0: scalar.Uint{Sym: "unknown"},
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1: scalar.Uint{Sym: "other", Description: "Not disposable"},
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2: scalar.Uint{Sym: "none", Description: "Is disposable"},
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})
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d.FieldU2("sample_has_redundancy", scalar.UintMap{
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0: scalar.Uint{Sym: "unknown"},
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2: scalar.Uint{Sym: "none", Description: "No redundant coding"},
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})
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d.FieldU3("sample_padding_value")
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d.FieldU1("sample_is_non_sync_sample")
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d.FieldU16("sample_degradation_priority")
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}
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func decodeBoxWithParentData(ctx *decodeContext, d *decode.D, parentData any, extraTypeMappers ...scalar.StrMapper) {
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var typ string
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var dataSize uint64
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typeMappers := []scalar.StrMapper{boxDescriptions}
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if len(extraTypeMappers) > 0 {
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typeMappers = append(typeMappers, extraTypeMappers...)
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}
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boxSize := d.FieldU32("size", boxSizeNames)
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typ = d.FieldStr("type", 4, charmap.ISO8859_1, typeMappers...)
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switch boxSize {
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case boxSizeRestOfFile:
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dataSize = uint64(d.Len()-d.Pos()) / 8
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case boxSizeUse64bitSize:
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boxSize = d.FieldU64("size64")
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dataSize = boxSize - 16
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default:
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dataSize = boxSize - 8
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}
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if ctx.opts.AllowTruncated && dataSize > uint64(d.BitsLeft()/8) {
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dataSize = uint64(d.BitsLeft() / 8)
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}
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if parentData != nil {
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ctx.path[len(ctx.path)-1].data = parentData
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}
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ctx.path = append(ctx.path, pathEntry{typ: typ, data: parentData})
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d.FramedFn(int64(dataSize*8), func(d *decode.D) {
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decodeBox(ctx, d, typ)
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})
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ctx.path = ctx.path[0 : len(ctx.path)-1]
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}
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func decodeBoxes(ctx *decodeContext, d *decode.D, extraTypeMappers ...scalar.StrMapper) {
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decodeBoxesWithParentData(ctx, d, nil, extraTypeMappers...)
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}
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func decodeBoxesWithParentData(ctx *decodeContext, d *decode.D, parentData any, extraTypeMappers ...scalar.StrMapper) {
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d.FieldStructArrayLoop("boxes", "box",
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func() bool { return d.BitsLeft() >= 8*8 },
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func(d *decode.D) {
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decodeBoxWithParentData(ctx, d, parentData, extraTypeMappers...)
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})
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if d.BitsLeft() > 0 {
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// "Some sample descriptions terminate with four zero bytes that are not otherwise indicated."
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if d.BitsLeft() >= 32 && d.PeekUintBits(32) == 0 {
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d.FieldU32("zero_terminator")
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}
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if d.BitsLeft() > 0 {
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d.FieldRawLen("padding", d.BitsLeft())
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}
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}
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}
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type rootBox struct {
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ftypMajorBrand string
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}
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type irefBox struct {
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version int
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}
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type trakBox struct {
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trackID int
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}
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type moofBox struct {
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offset int64
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}
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type trafBox struct {
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trackID int
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baseDataOffset int64
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moof *moof
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}
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type metaBox struct {
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subType string
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keys *keysBox
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}
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type keysBoxKey struct {
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namespace string
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name string
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}
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type keysBox struct {
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keys []keysBoxKey
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}
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func decodeBoxIrefEntry(ctx *decodeContext, d *decode.D) {
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irefBox, ok := ctx.parent().data.(*irefBox)
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if !ok {
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d.FieldRawLen("data", d.BitsLeft())
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return
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}
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idSize := 16
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if irefBox.version != 0 {
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idSize = 32
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}
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d.FieldU("from_id", idSize)
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count := d.FieldU16("count")
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d.FieldArray("ids", func(d *decode.D) {
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for i := uint64(0); i < count; i++ {
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d.FieldU("id", idSize)
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}
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})
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}
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func decodeBoxFtyp(ctx *decodeContext, d *decode.D) {
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root := ctx.rootBox()
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brand := d.FieldUTF8("major_brand", 4, scalar.ActualTrimSpace)
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root.ftypMajorBrand = brand
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|
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d.FieldU32("minor_version", scalar.UintFn(func(s scalar.Uint) (scalar.Uint, error) {
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switch brand {
|
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case "qt":
|
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// https://developer.apple.com/library/archive/documentation/QuickTime/QTFF/QTFFChap1/qtff1.html#//apple_ref/doc/uid/TP40000939-CH203-BBCGDDDF
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// "For QuickTime movie files, this takes the form of four binary-coded decimal values, indicating the century,
|
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// year, and month of the QuickTime File Format Specification, followed by a binary coded decimal zero. For example,
|
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// for the June 2004 minor version, this field is set to the BCD values 20 04 06 00."
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s.Description = fmt.Sprintf("%.4d.%.2d", (s.Actual>>24)&0xff_ff, (s.Actual>>8)&0xff)
|
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}
|
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return s, nil
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}))
|
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numBrands := d.BitsLeft() / 8 / 4
|
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var i int64
|
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d.FieldArrayLoop("brands", func() bool { return i < numBrands }, func(d *decode.D) {
|
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d.FieldUTF8("brand", 4, brandDescriptions, scalar.ActualTrimSpace)
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i++
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})
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}
|
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|
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func decodeBox(ctx *decodeContext, d *decode.D, typ string) {
|
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switch typ {
|
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case "ftyp":
|
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decodeBoxFtyp(ctx, d)
|
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case "styp":
|
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decodeBoxFtyp(ctx, d)
|
|
case "mvhd":
|
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version := d.FieldU8("version")
|
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d.FieldU24("flags")
|
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switch version {
|
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case 0:
|
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d.FieldU32("creation_time", uintActualQuicktimeEpochDescription)
|
|
d.FieldU32("modification_time", uintActualQuicktimeEpochDescription)
|
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d.FieldU32("time_scale")
|
|
d.FieldU32("duration")
|
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case 1:
|
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d.FieldU64("creation_time", uintActualQuicktimeEpochDescription)
|
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d.FieldU64("modification_time", uintActualQuicktimeEpochDescription)
|
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d.FieldU32("time_scale")
|
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d.FieldU64("duration")
|
|
default:
|
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return
|
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}
|
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d.FieldFP32("preferred_rate")
|
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d.FieldFP16("preferred_volume")
|
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d.FieldUTF8("reserved", 10)
|
|
decodeMvhdFieldMatrix(d, "matrix_structure")
|
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d.FieldU32("preview_time")
|
|
d.FieldU32("preview_duration")
|
|
d.FieldU32("poster_time")
|
|
d.FieldU32("selection_time")
|
|
d.FieldU32("selection_duration")
|
|
d.FieldU32("current_time")
|
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d.FieldU32("next_track_id")
|
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case "trak":
|
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decodeBoxesWithParentData(ctx, d, &trakBox{})
|
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case "edts":
|
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decodeBoxes(ctx, d)
|
|
case "elst":
|
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version := d.FieldU8("version")
|
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d.FieldU24("flags")
|
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entryCount := d.FieldU32("entry_count")
|
|
var i uint64
|
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d.FieldStructArrayLoop("entries", "entry", func() bool { return i < entryCount }, func(d *decode.D) {
|
|
switch version {
|
|
case 0:
|
|
d.FieldS32("segment_duration")
|
|
d.FieldS32("media_time", mediaTimeNames)
|
|
case 1:
|
|
d.FieldS64("segment_duration")
|
|
d.FieldS64("media_time", mediaTimeNames)
|
|
default:
|
|
return
|
|
}
|
|
d.FieldFP32("media_rate")
|
|
i++
|
|
})
|
|
case "tref":
|
|
decodeBoxes(ctx, d)
|
|
case "tkhd":
|
|
var trackID int
|
|
version := d.FieldU8("version")
|
|
d.FieldStruct("flags", func(d *decode.D) {
|
|
d.FieldU20("unused")
|
|
d.FieldBool("size_is_aspect_ratio")
|
|
d.FieldBool("in_preview")
|
|
d.FieldBool("in_movie")
|
|
d.FieldBool("enabled")
|
|
})
|
|
switch version {
|
|
case 0:
|
|
d.FieldU32("creation_time", uintActualQuicktimeEpochDescription)
|
|
d.FieldU32("modification_time", uintActualQuicktimeEpochDescription)
|
|
trackID = int(d.FieldU32("track_id"))
|
|
d.FieldU32("reserved1")
|
|
d.FieldU32("duration")
|
|
case 1:
|
|
d.FieldU64("creation_time", uintActualQuicktimeEpochDescription)
|
|
d.FieldU64("modification_time", uintActualQuicktimeEpochDescription)
|
|
trackID = int(d.FieldU32("track_id"))
|
|
d.FieldU32("reserved1")
|
|
d.FieldU64("duration")
|
|
default:
|
|
return
|
|
}
|
|
d.FieldRawLen("reserved2", 8*8)
|
|
d.FieldU16("layer")
|
|
d.FieldU16("alternate_group")
|
|
d.FieldFP16("volume")
|
|
d.FieldU16("reserved3")
|
|
decodeMvhdFieldMatrix(d, "matrix_structure")
|
|
d.FieldFP32("track_width")
|
|
d.FieldFP32("track_height")
|
|
|
|
if t := ctx.currentTrakBox(); t != nil {
|
|
t.trackID = trackID
|
|
_ = ctx.currentTrack()
|
|
}
|
|
case "mdia":
|
|
decodeBoxes(ctx, d)
|
|
case "mdhd":
|
|
version := d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
// TODO: timestamps
|
|
switch version {
|
|
case 0:
|
|
d.FieldU32("creation_time", uintActualQuicktimeEpochDescription)
|
|
d.FieldU32("modification_time", uintActualQuicktimeEpochDescription)
|
|
d.FieldU32("time_scale")
|
|
d.FieldU32("duration")
|
|
case 1:
|
|
d.FieldU64("creation_time", uintActualQuicktimeEpochDescription)
|
|
d.FieldU64("modification_time", uintActualQuicktimeEpochDescription)
|
|
d.FieldU32("time_scale")
|
|
d.FieldU64("duration")
|
|
default:
|
|
return
|
|
}
|
|
d.FieldStrFn("language", decodeLang)
|
|
d.FieldU16("quality")
|
|
case "vmhd":
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
d.FieldU16("graphicsmode")
|
|
d.FieldArray("opcolor", func(d *decode.D) {
|
|
// TODO: is FP16?
|
|
d.FieldU16("value")
|
|
d.FieldU16("value")
|
|
d.FieldU16("value")
|
|
})
|
|
case "hdlr":
|
|
majorBrand := ctx.rootBox().ftypMajorBrand
|
|
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
d.FieldUTF8NullFixedLen("component_type", 4)
|
|
subType := d.FieldUTF8("component_subtype", 4, subTypeNames, scalar.ActualTrimSpace)
|
|
d.FieldUTF8NullFixedLen("component_manufacturer", 4)
|
|
d.FieldU32("component_flags")
|
|
d.FieldU32("component_flags_mask")
|
|
|
|
switch majorBrand {
|
|
case "qt":
|
|
// qt brand seems to use length prefixed strings
|
|
d.FieldUTF8ShortStringFixedLen("component_name", int(d.BitsLeft()/8))
|
|
default:
|
|
d.FieldUTF8NullFixedLen("component_name", int(d.BitsLeft()/8))
|
|
}
|
|
|
|
if t := ctx.currentTrack(); t != nil {
|
|
t.seenHdlr = true
|
|
// component_type seems to be all zero sometimes so can't look for "mhlr"
|
|
switch subType {
|
|
case "vide", "soun":
|
|
t.subType = subType
|
|
}
|
|
} else if m := ctx.currentMetaBox(); m != nil {
|
|
m.subType = subType
|
|
}
|
|
case "minf":
|
|
decodeBoxes(ctx, d)
|
|
case "dinf":
|
|
decodeBoxes(ctx, d)
|
|
case "dref":
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
entryCount := d.FieldU32("entry_count")
|
|
var i uint64
|
|
d.FieldStructArrayLoop("boxes", "box", func() bool { return i < entryCount }, func(d *decode.D) {
|
|
size := d.FieldU32("size")
|
|
d.FieldUTF8("type", 4)
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
dataSize := size - 12
|
|
d.FieldRawLen("data", int64(dataSize*8))
|
|
i++
|
|
})
|
|
case "stbl":
|
|
decodeBoxes(ctx, d)
|
|
case "stsd":
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
entryCount := d.FieldU32("entry_count")
|
|
var i uint64
|
|
// note called "boxes" here instead of "sample_descriptions" and data format is named "type".
|
|
// this is to make it easier to threat them as normal boxes
|
|
d.FieldArrayLoop("boxes", func() bool { return i < entryCount }, func(d *decode.D) {
|
|
d.FieldStruct("box", func(d *decode.D) {
|
|
size := d.FieldU32("size")
|
|
dataFormat := d.FieldUTF8("type", 4, dataFormatNames)
|
|
subType := ""
|
|
if t := ctx.currentTrack(); t != nil {
|
|
t.sampleDescriptions = append(t.sampleDescriptions, sampleDescription{
|
|
dataFormat: dataFormat,
|
|
})
|
|
|
|
if t.seenHdlr {
|
|
subType = t.subType
|
|
} else {
|
|
// TODO: seems to be ffmpeg mov.c, where is this documented in specs?
|
|
// no hdlr box found, guess using dataFormat
|
|
// ex PNG samples but there is no hdlr box saying it's video, but the esds says MPEGObjectTypePNG
|
|
switch dataFormat {
|
|
case "mp4v":
|
|
subType = "vide"
|
|
case "mp4a":
|
|
subType = "soun"
|
|
}
|
|
}
|
|
}
|
|
|
|
d.FramedFn(int64(size-8)*8, func(d *decode.D) {
|
|
d.FieldRawLen("reserved", 6*8)
|
|
d.FieldU16("data_reference_index")
|
|
|
|
switch subType {
|
|
case "soun", "vide":
|
|
|
|
version := d.FieldU16("version")
|
|
d.FieldU16("revision_level")
|
|
d.FieldU32("max_packet_size") // TODO: vendor for some subtype?
|
|
|
|
switch subType {
|
|
case "soun":
|
|
// AudioSampleEntry
|
|
// https://developer.apple.com/library/archive/documentation/QuickTime/QTFF/QTFFChap3/qtff3.html#//apple_ref/doc/uid/TP40000939-CH205-SW1
|
|
switch version {
|
|
case 0:
|
|
d.FieldU16("num_audio_channels")
|
|
d.FieldU16("sample_size")
|
|
d.FieldU16("compression_id")
|
|
d.FieldU16("packet_size")
|
|
d.FieldFP32("sample_rate")
|
|
if d.BitsLeft() > 0 {
|
|
decodeBoxes(ctx, d)
|
|
}
|
|
case 1:
|
|
d.FieldU16("num_audio_channels")
|
|
d.FieldU16("sample_size")
|
|
d.FieldU16("compression_id")
|
|
d.FieldU16("packet_size")
|
|
d.FieldFP32("sample_rate")
|
|
d.FieldU32("samples_per_packet")
|
|
d.FieldU32("bytes_per_packet")
|
|
d.FieldU32("bytes_per_frame")
|
|
d.FieldU32("bytes_per_sample")
|
|
if d.BitsLeft() > 0 {
|
|
decodeBoxes(ctx, d)
|
|
}
|
|
case 2:
|
|
d.FieldU16("always_3")
|
|
d.FieldU16("always_16")
|
|
d.FieldU16("always_minus_2") // TODO: as in const -2?
|
|
d.FieldU16("always_0")
|
|
d.FieldU32("always_65536")
|
|
d.FieldU32("size_of_struct_only")
|
|
d.FieldF64("audio_sample_rate")
|
|
d.FieldU32("num_audio_channels")
|
|
d.FieldU32("always_7f000000")
|
|
d.FieldU32("const_bits_per_channel")
|
|
d.FieldU32("format_specific_flags")
|
|
d.FieldU32("const_bytes_per_audio_packet")
|
|
d.FieldU32("const_lpcm_frames_per_audio_packet")
|
|
if d.BitsLeft() > 0 {
|
|
decodeBoxes(ctx, d)
|
|
}
|
|
default:
|
|
d.FieldRawLen("data", d.BitsLeft())
|
|
}
|
|
case "vide":
|
|
// VideoSampleEntry
|
|
// TODO: version 0 and 1 same?
|
|
switch version {
|
|
case 0, 1:
|
|
d.FieldU32("temporal_quality")
|
|
d.FieldU32("spatial_quality")
|
|
d.FieldU16("width")
|
|
d.FieldU16("height")
|
|
d.FieldFP32("horizontal_resolution")
|
|
d.FieldFP32("vertical_resolution")
|
|
d.FieldU32("data_size")
|
|
d.FieldU16("frame_count")
|
|
d.FieldUTF8ShortStringFixedLen("compressor_name", 32)
|
|
d.FieldU16("depth")
|
|
d.FieldS16("color_table_id")
|
|
// TODO: if 0 decode ctab
|
|
if d.BitsLeft() > 0 {
|
|
decodeBoxes(ctx, d)
|
|
}
|
|
default:
|
|
d.FieldRawLen("data", d.BitsLeft())
|
|
}
|
|
// case "hint": TODO: Hint entry
|
|
default:
|
|
d.FieldRawLen("data", d.BitsLeft())
|
|
}
|
|
default:
|
|
d.FieldRawLen("data", d.BitsLeft())
|
|
}
|
|
|
|
})
|
|
})
|
|
i++
|
|
})
|
|
case "avcC":
|
|
_, v := d.FieldFormat("descriptor", &avcDCRGroup, nil)
|
|
avcDcrOut, ok := v.(format.AVC_DCR_Out)
|
|
if !ok {
|
|
panic(fmt.Sprintf("expected AvcDcrOut got %#+v", v))
|
|
}
|
|
if t := ctx.currentTrack(); t != nil {
|
|
t.formatInArg = format.AVC_AU_In{LengthSize: avcDcrOut.LengthSize} //nolint:gosimple
|
|
}
|
|
case "hvcC":
|
|
_, v := d.FieldFormat("descriptor", &hevcCDCRGroup, nil)
|
|
hevcDcrOut, ok := v.(format.HEVC_DCR_Out)
|
|
if !ok {
|
|
panic(fmt.Sprintf("expected HevcDcrOut got %#+v", v))
|
|
}
|
|
if t := ctx.currentTrack(); t != nil {
|
|
t.formatInArg = format.HEVC_AU_In{LengthSize: hevcDcrOut.LengthSize} //nolint:gosimple
|
|
}
|
|
case "dfLa":
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
_, v := d.FieldFormat("descriptor", &flacMetadatablocksGroup, nil)
|
|
flacMetadatablockOut, ok := v.(format.FLAC_Metadatablocks_Out)
|
|
if !ok {
|
|
panic(fmt.Sprintf("expected FlacMetadatablockOut got %#+v", v))
|
|
}
|
|
if flacMetadatablockOut.HasStreamInfo {
|
|
if t := ctx.currentTrack(); t != nil {
|
|
t.formatInArg = format.FLAC_Frame_In{BitsPerSample: int(flacMetadatablockOut.StreamInfo.BitsPerSample)}
|
|
}
|
|
}
|
|
case "dOps":
|
|
d.FieldFormat("descriptor", &opusPacketFrameGroup, nil)
|
|
case "av1C":
|
|
d.FieldFormat("descriptor", &av1CCRGroup, nil)
|
|
case "vpcC":
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
d.FieldFormat("descriptor", &vpxCCRGroup, nil)
|
|
case "iods":
|
|
d.FieldU32("version")
|
|
d.FieldFormat("descriptor", &mpegESGroup, nil)
|
|
case "esds":
|
|
d.FieldU32("version")
|
|
_, v := d.FieldFormat("descriptor", &mpegESGroup, nil)
|
|
mpegEsOut, ok := v.(format.MPEG_ES_Out)
|
|
if !ok {
|
|
panic(fmt.Sprintf("expected mpegEsOut got %#+v", v))
|
|
}
|
|
|
|
if t := ctx.currentTrack(); t != nil && len(mpegEsOut.DecoderConfigs) > 0 {
|
|
dc := mpegEsOut.DecoderConfigs[0]
|
|
t.objectType = dc.ObjectType
|
|
t.formatInArg = format.AAC_Frame_In{ObjectType: dc.ASCObjectType}
|
|
}
|
|
case "stts":
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
numEntries := d.FieldU32("entry_count")
|
|
var i uint64
|
|
d.FieldStructArrayLoop("entries", "entry", func() bool { return i < numEntries }, func(d *decode.D) {
|
|
d.FieldU32("count")
|
|
d.FieldU32("delta")
|
|
i++
|
|
})
|
|
case "stsc":
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
entryCount := d.FieldU32("entry_count")
|
|
var i uint64
|
|
d.FieldStructArrayLoop("entries", "entry", func() bool { return i < entryCount }, func(d *decode.D) {
|
|
firstChunk := uint32(d.FieldU32("first_chunk"))
|
|
samplesPerChunk := uint32(d.FieldU32("samples_per_chunk"))
|
|
d.FieldU32("sample_description_id")
|
|
|
|
if t := ctx.currentTrack(); t != nil {
|
|
t.stsc = append(t.stsc, stsc{
|
|
firstChunk: int(firstChunk),
|
|
samplesPerChunk: int(samplesPerChunk),
|
|
})
|
|
}
|
|
i++
|
|
})
|
|
case "stsz":
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
// TODO: bytes_per_sample from audio stsd?
|
|
sampleSize := d.FieldU32("sample_size")
|
|
entryCount := d.FieldU32("entry_count")
|
|
|
|
t := ctx.currentTrack()
|
|
|
|
if t != nil && len(t.stsz) > 0 {
|
|
d.Errorf("multiple stsz or stz2 boxes")
|
|
}
|
|
if sampleSize == 0 {
|
|
var i uint64
|
|
d.FieldArrayLoop("entries", func() bool { return i < entryCount }, func(d *decode.D) {
|
|
size := uint32(d.FieldU32("size"))
|
|
if t != nil {
|
|
t.stsz = append(t.stsz, stsz{
|
|
size: int64(size),
|
|
count: 1,
|
|
})
|
|
}
|
|
i++
|
|
})
|
|
} else {
|
|
if t != nil {
|
|
t.stsz = append(t.stsz, stsz{
|
|
size: int64(sampleSize),
|
|
count: int(entryCount),
|
|
})
|
|
}
|
|
}
|
|
case "stz2":
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
fieldSize := d.FieldU32("field_size")
|
|
if fieldSize > 16 {
|
|
d.Errorf("field_size %d > 16", fieldSize)
|
|
}
|
|
entryCount := d.FieldU32("entry_count")
|
|
var i uint64
|
|
t := ctx.currentTrack()
|
|
if t != nil && len(t.stsz) > 0 {
|
|
d.Errorf("multiple stsz or stz2 boxes")
|
|
}
|
|
d.FieldArrayLoop("entries", func() bool { return i < entryCount }, func(d *decode.D) {
|
|
size := uint32(d.FieldU("size", int(fieldSize)))
|
|
if t != nil {
|
|
t.stsz = append(t.stsz, stsz{
|
|
size: int64(size),
|
|
count: 1,
|
|
})
|
|
}
|
|
i++
|
|
})
|
|
case "stco":
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
entryCount := d.FieldU32("entry_count")
|
|
var i uint64
|
|
t := ctx.currentTrack()
|
|
d.FieldArrayLoop("entries", func() bool { return i < entryCount }, func(d *decode.D) {
|
|
chunkOffset := d.FieldU32("chunk_offset")
|
|
if t != nil {
|
|
t.stco = append(t.stco, int64(chunkOffset))
|
|
}
|
|
i++
|
|
})
|
|
case "stss":
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
entryCount := d.FieldU32("entry_count")
|
|
d.FieldArray("entries", func(d *decode.D) {
|
|
for i := uint64(0); i < entryCount; i++ {
|
|
d.FieldU32("sample_number")
|
|
}
|
|
})
|
|
case "sdtp":
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
// TODO: should be count from stsz
|
|
// TODO: can we know count here or do we need to defer decoding somehow?
|
|
d.FieldArray("entries", func(d *decode.D) {
|
|
for d.NotEnd() {
|
|
d.FieldStruct("entry", func(d *decode.D) {
|
|
d.FieldU2("reserved")
|
|
values := scalar.UintMapSymStr{
|
|
0: "unknown",
|
|
1: "yes",
|
|
2: "no",
|
|
}
|
|
d.FieldU2("sample_depends_on", values)
|
|
d.FieldU2("sample_is_depended_on", values)
|
|
d.FieldU2("sample_has_redundancy", values)
|
|
})
|
|
}
|
|
})
|
|
case "ctts":
|
|
version := d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
entryCount := d.FieldU32("entry_count")
|
|
var i uint64
|
|
d.FieldStructArrayLoop("entries", "entry", func() bool { return i < entryCount }, func(d *decode.D) {
|
|
d.FieldS32("sample_count")
|
|
switch version {
|
|
case 0:
|
|
d.FieldU32("sample_offset")
|
|
case 1:
|
|
d.FieldS32("sample_offset")
|
|
}
|
|
i++
|
|
})
|
|
// TODO: refactor: merge with stco?
|
|
case "co64":
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
entryCount := d.FieldU32("entry_count")
|
|
var i uint64
|
|
t := ctx.currentTrack()
|
|
d.FieldArrayLoop("entries", func() bool { return i < entryCount }, func(d *decode.D) {
|
|
offset := d.FieldU64("offset")
|
|
if t != nil {
|
|
t.stco = append(t.stco, int64(offset))
|
|
}
|
|
i++
|
|
})
|
|
case "sidx":
|
|
version := d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
d.FieldU32("reference_id")
|
|
d.FieldU32("timescale")
|
|
if version == 0 {
|
|
d.FieldU32("pts")
|
|
d.FieldU32("offset")
|
|
} else {
|
|
d.FieldU64("pts")
|
|
d.FieldU64("offset")
|
|
}
|
|
d.FieldU16("reserved")
|
|
numEntries := d.FieldU16("entry_count")
|
|
var i uint64
|
|
d.FieldStructArrayLoop("entries", "entry", func() bool { return i < numEntries }, func(d *decode.D) {
|
|
d.FieldU1("reference_type")
|
|
d.FieldU31("size")
|
|
d.FieldU32("duration")
|
|
d.FieldU1("starts_with_sap")
|
|
d.FieldU3("sap_type")
|
|
d.FieldU28("sap_delta_time")
|
|
i++
|
|
})
|
|
case "udta":
|
|
decodeBoxes(ctx, d)
|
|
case "meta":
|
|
// TODO: meta box sometimes has a 4 byte unknown field? (flag/version?)
|
|
maybeFlags := d.PeekUintBits(32)
|
|
if maybeFlags == 0 {
|
|
// TODO: rename?
|
|
d.FieldU32("maybe_flags")
|
|
}
|
|
decodeBoxesWithParentData(ctx, d, &metaBox{})
|
|
case "ilst":
|
|
if mb := ctx.currentMetaBox(); mb != nil && mb.keys != nil && len(mb.keys.keys) > 0 {
|
|
// meta box had a keys box
|
|
var b [4]byte
|
|
typeSymMapper := scalar.StrMapSymStr{}
|
|
for k, v := range mb.keys.keys {
|
|
// type will be a uint32 be integer
|
|
// +1 as they seem to be counted from 1
|
|
binary.BigEndian.PutUint32(b[:], uint32(k+1))
|
|
typeSymMapper[string(b[:])] = v.namespace + "." + v.name
|
|
}
|
|
|
|
decodeBoxes(ctx, d, typeSymMapper)
|
|
} else {
|
|
decodeBoxes(ctx, d)
|
|
}
|
|
case "data":
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
d.FieldU32("reserved")
|
|
if ctx.isParent("covr") {
|
|
d.FieldFormatOrRawLen("data", d.BitsLeft(), &imageGroup, nil)
|
|
} else {
|
|
d.FieldUTF8("data", int(d.BitsLeft()/8))
|
|
}
|
|
case "moov":
|
|
decodeBoxes(ctx, d)
|
|
case "moof":
|
|
offset := (d.Pos() / 8) - 8
|
|
decodeBoxesWithParentData(ctx, d, &moofBox{offset: offset})
|
|
// Track Fragment
|
|
case "traf":
|
|
decodeBoxesWithParentData(ctx, d, &trafBox{})
|
|
// Movie Fragment Header
|
|
case "mfhd":
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
d.FieldU32("sequence_number")
|
|
// Track Fragment Header
|
|
case "tfhd":
|
|
d.FieldU8("version")
|
|
baseDataOffsetPresent := false
|
|
sampleDescriptionIndexPresent := false
|
|
defaultSampleDurationPresent := false
|
|
defaultSampleSizePresent := false
|
|
defaultSampleFlagsPresent := false
|
|
d.FieldStruct("flags", func(d *decode.D) {
|
|
d.FieldU7("unused0")
|
|
d.FieldBool("duration_is_empty")
|
|
d.FieldU10("unused1")
|
|
defaultSampleFlagsPresent = d.FieldBool("default_sample_flags_present")
|
|
defaultSampleSizePresent = d.FieldBool("default_sample_size_present")
|
|
defaultSampleDurationPresent = d.FieldBool("default_sample_duration_present")
|
|
d.FieldU1("unused2")
|
|
sampleDescriptionIndexPresent = d.FieldBool("sample_description_index_present")
|
|
baseDataOffsetPresent = d.FieldBool("base_data_offset_present")
|
|
})
|
|
trackID := int(d.FieldU32("track_id"))
|
|
|
|
m := &moof{}
|
|
if mb := ctx.currentMoofBox(); mb != nil {
|
|
m.offset = mb.offset
|
|
}
|
|
|
|
baseDataOffset := int64(0)
|
|
if baseDataOffsetPresent {
|
|
baseDataOffset = int64(d.FieldU64("base_data_offset"))
|
|
}
|
|
if sampleDescriptionIndexPresent {
|
|
m.defaultSampleDescriptionIndex = int(d.FieldU32("sample_description_index"))
|
|
}
|
|
if defaultSampleDurationPresent {
|
|
d.FieldU32("default_sample_duration")
|
|
}
|
|
if defaultSampleSizePresent {
|
|
m.defaultSampleSize = int64(d.FieldU32("default_sample_size"))
|
|
}
|
|
if defaultSampleFlagsPresent {
|
|
d.FieldStruct("default_sample_flags", decodeSampleFlags)
|
|
}
|
|
|
|
if t := ctx.currentTrafBox(); t != nil {
|
|
t.trackID = trackID
|
|
t.moof = m
|
|
t.baseDataOffset = baseDataOffset
|
|
}
|
|
if t := ctx.currentTrack(); t != nil {
|
|
t.moofs = append(t.moofs, m)
|
|
}
|
|
// Track Fragment Run
|
|
case "trun":
|
|
m := &moof{}
|
|
if t := ctx.currentTrafBox(); t != nil {
|
|
m = t.moof
|
|
}
|
|
|
|
version := d.FieldU8("version")
|
|
sampleCompositionTimeOffsetsPresent := false
|
|
sampleFlagsPresent := false
|
|
sampleSizePresent := false
|
|
sampleDurationPresent := false
|
|
firstSampleFlagsPresent := false
|
|
dataOffsetPresent := false
|
|
d.FieldStruct("flags", func(d *decode.D) {
|
|
d.FieldU12("unused0")
|
|
sampleCompositionTimeOffsetsPresent = d.FieldBool("sample_composition_time_offsets_present")
|
|
sampleFlagsPresent = d.FieldBool("sample_flags_present")
|
|
sampleSizePresent = d.FieldBool("sample_size_present")
|
|
sampleDurationPresent = d.FieldBool("sample_duration_present")
|
|
d.FieldU5("unused1")
|
|
firstSampleFlagsPresent = d.FieldBool("first_sample_flags_present")
|
|
d.FieldU1("unused2")
|
|
dataOffsetPresent = d.FieldBool("data_offset_present")
|
|
})
|
|
sampleCount := d.FieldU32("sample_count")
|
|
dataOffset := int64(0)
|
|
if dataOffsetPresent {
|
|
dataOffset = d.FieldS32("data_offset")
|
|
}
|
|
if firstSampleFlagsPresent {
|
|
d.FieldStruct("first_sample_flags", decodeSampleFlags)
|
|
}
|
|
|
|
if sampleCount > maxSampleEntryCount {
|
|
d.Errorf("too many sample trun entries %d > %d", sampleCount, maxSampleEntryCount)
|
|
}
|
|
|
|
t := trun{
|
|
dataOffset: dataOffset,
|
|
}
|
|
d.FieldArray("samples", func(d *decode.D) {
|
|
for i := uint64(0); i < sampleCount; i++ {
|
|
sampleSize := m.defaultSampleSize
|
|
d.FieldStruct("sample", func(d *decode.D) {
|
|
if sampleDurationPresent {
|
|
d.FieldU32("sample_duration")
|
|
}
|
|
if sampleSizePresent {
|
|
sampleSize = int64(d.FieldU32("sample_size"))
|
|
}
|
|
if sampleFlagsPresent {
|
|
d.FieldStruct("sample_flags", decodeSampleFlags)
|
|
}
|
|
if sampleCompositionTimeOffsetsPresent {
|
|
if version == 0 {
|
|
d.FieldU32("sample_composition_time_offset")
|
|
} else {
|
|
d.FieldS32("sample_composition_time_offset")
|
|
}
|
|
}
|
|
})
|
|
|
|
t.samplesSizes = append(t.samplesSizes, sampleSize)
|
|
}
|
|
})
|
|
|
|
m.truns = append(m.truns, t)
|
|
case "tfdt":
|
|
version := d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
if version == 1 {
|
|
d.FieldU64("start_time")
|
|
} else {
|
|
d.FieldU32("start_time")
|
|
}
|
|
case "mvex":
|
|
decodeBoxes(ctx, d)
|
|
case "trex":
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
d.FieldU32("track_id")
|
|
d.FieldU32("default_sample_description_index")
|
|
d.FieldU32("default_sample_duration")
|
|
d.FieldU32("default_sample_size")
|
|
d.FieldStruct("default_sample_flags", decodeSampleFlags)
|
|
case "mfra":
|
|
decodeBoxes(ctx, d)
|
|
case "tfra":
|
|
version := d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
d.FieldU32("track_id")
|
|
d.FieldU26("reserved")
|
|
lengthSizeOfTrafNum := d.FieldU2("length_size_of_traf_num")
|
|
sampleLengthSizeOfTrunNum := d.FieldU2("sample_length_size_of_trun_num")
|
|
lengthSizeOfSampleNum := d.FieldU2("length_size_of_sample_num")
|
|
entryCount := d.FieldU32("entry_count")
|
|
d.FieldArray("entries", func(d *decode.D) {
|
|
for i := uint64(0); i < entryCount; i++ {
|
|
d.FieldStruct("entry", func(d *decode.D) {
|
|
if version == 1 {
|
|
d.FieldU64("time")
|
|
d.FieldU64("moof_offset")
|
|
} else {
|
|
d.FieldU32("time")
|
|
d.FieldU32("moof_offset")
|
|
}
|
|
d.FieldU("traf_number", int(lengthSizeOfTrafNum+1)*8)
|
|
d.FieldU("trun_number", int(sampleLengthSizeOfTrunNum+1)*8)
|
|
d.FieldU("sample_number", int(lengthSizeOfSampleNum+1)*8)
|
|
})
|
|
}
|
|
})
|
|
case "mfro":
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
d.FieldU32("mfra_size")
|
|
// TODO: item location
|
|
// HEIC image
|
|
case "iloc":
|
|
version := d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
|
|
offsetSize := d.FieldU4("offset_size")
|
|
lengthSize := d.FieldU4("length_size")
|
|
baseOffsetSize := d.FieldU4("base_offset_size")
|
|
var indexSize uint64
|
|
switch version {
|
|
case 1, 2:
|
|
indexSize = d.FieldU4("index_size")
|
|
default:
|
|
d.FieldU4("reserved")
|
|
}
|
|
var itemCount uint64
|
|
if version < 2 {
|
|
itemCount = d.FieldU16("item_count")
|
|
} else {
|
|
itemCount = d.FieldU32("item_count")
|
|
}
|
|
d.FieldArray("items", func(d *decode.D) {
|
|
for i := uint64(0); i < itemCount; i++ {
|
|
d.FieldStruct("item", func(d *decode.D) {
|
|
switch version {
|
|
case 0, 1:
|
|
d.FieldU16("id")
|
|
case 2:
|
|
d.FieldU32("id")
|
|
}
|
|
switch version {
|
|
case 1, 2:
|
|
d.FieldU12("reserved")
|
|
d.FieldU4("construction_method")
|
|
}
|
|
d.FieldU16("data_reference_index")
|
|
d.FieldU("base_offset", int(baseOffsetSize)*8)
|
|
extentCount := d.FieldU16("extent_count")
|
|
d.FieldArray("extends", func(d *decode.D) {
|
|
for i := uint64(0); i < extentCount; i++ {
|
|
d.FieldStruct("extent", func(d *decode.D) {
|
|
if (version == 1 || version == 2) && indexSize > 0 {
|
|
d.FieldU("index", int(offsetSize)*8)
|
|
}
|
|
d.FieldU("offset", int(offsetSize)*8)
|
|
d.FieldU("length", int(lengthSize)*8)
|
|
})
|
|
}
|
|
})
|
|
})
|
|
}
|
|
})
|
|
case "infe":
|
|
version := d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
if version == 0 || version == 1 {
|
|
d.FieldU16("item_id")
|
|
d.FieldU16("item_protection_index")
|
|
d.FieldUTF8Null("item_name")
|
|
d.FieldUTF8Null("content_type")
|
|
if !d.End() {
|
|
d.FieldUTF8Null("content_encoding")
|
|
}
|
|
}
|
|
if version == 1 {
|
|
if !d.End() {
|
|
d.FieldU32("extension_type")
|
|
}
|
|
if !d.End() {
|
|
d.FieldU32("extension_type_extra")
|
|
}
|
|
}
|
|
if version >= 2 {
|
|
switch version {
|
|
case 2:
|
|
d.FieldU16("item_id")
|
|
case 3:
|
|
d.FieldU32("item_id")
|
|
}
|
|
d.FieldU16("item_protection_index")
|
|
itemType := d.FieldUTF8("item_type", 4)
|
|
d.FieldUTF8Null("item_name")
|
|
switch itemType {
|
|
case "mime":
|
|
d.FieldUTF8Null("content_type")
|
|
if !d.End() {
|
|
d.FieldUTF8Null("content_encoding")
|
|
}
|
|
case "uri ":
|
|
d.FieldUTF8Null("item_uri_type")
|
|
}
|
|
}
|
|
case "iinf":
|
|
version := d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
if version == 0 {
|
|
d.FieldU16("entry_count")
|
|
} else {
|
|
d.FieldU32("entry_count")
|
|
}
|
|
decodeBoxes(ctx, d)
|
|
case "iprp":
|
|
decodeBoxes(ctx, d)
|
|
case "ipco":
|
|
decodeBoxes(ctx, d)
|
|
case "ID32":
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
d.FieldU1("pad")
|
|
// ISO-639-2/T as 3*5 bit integers - 0x60
|
|
d.FieldStrFn("language", func(d *decode.D) string {
|
|
s := ""
|
|
for i := 0; i < 3; i++ {
|
|
s += fmt.Sprintf("%c", int(d.U5())+0x60)
|
|
}
|
|
return s
|
|
})
|
|
d.FieldFormat("data", &id3v2Group, nil)
|
|
case "mehd":
|
|
version := d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
switch version {
|
|
case 0:
|
|
d.FieldU32("fragment_duration")
|
|
case 1:
|
|
d.FieldU64("fragment_duration")
|
|
}
|
|
case "pssh":
|
|
var (
|
|
systemIDCommon = [16]byte{0x10, 0x77, 0xef, 0xec, 0xc0, 0xb2, 0x4d, 0x02, 0xac, 0xe3, 0x3c, 0x1e, 0x52, 0xe2, 0xfb, 0x4b}
|
|
systemIDWidevine = [16]byte{0xed, 0xef, 0x8b, 0xa9, 0x79, 0xd6, 0x4a, 0xce, 0xa3, 0xc8, 0x27, 0xdc, 0xd5, 0x1d, 0x21, 0xed}
|
|
systemIDPlayReady = [16]byte{0x9a, 0x04, 0xf0, 0x79, 0x98, 0x40, 0x42, 0x86, 0xab, 0x92, 0xe6, 0x5b, 0xe0, 0x88, 0x5f, 0x95}
|
|
systemIDFairPlay = [16]byte{0x94, 0xce, 0x86, 0xfb, 0x07, 0xff, 0x4f, 0x43, 0xad, 0xb8, 0x93, 0xd2, 0xfa, 0x96, 0x8c, 0xa2}
|
|
)
|
|
systemIDNames := scalar.RawBytesMap{
|
|
{Bytes: systemIDCommon[:], Scalar: scalar.BitBuf{Sym: "common"}},
|
|
{Bytes: systemIDWidevine[:], Scalar: scalar.BitBuf{Sym: "widevine"}},
|
|
{Bytes: systemIDPlayReady[:], Scalar: scalar.BitBuf{Sym: "playready"}},
|
|
{Bytes: systemIDFairPlay[:], Scalar: scalar.BitBuf{Sym: "fairplay"}},
|
|
}
|
|
|
|
version := d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
systemIDBR := d.FieldRawLen("system_id", 16*8, systemIDNames)
|
|
// TODO: make nicer
|
|
systemID := d.ReadAllBits(systemIDBR)
|
|
switch version {
|
|
case 0:
|
|
case 1:
|
|
kidCount := d.FieldU32("kid_count")
|
|
d.FieldArray("kids", func(d *decode.D) {
|
|
for i := uint64(0); i < kidCount; i++ {
|
|
d.FieldRawLen("kid", 16*8)
|
|
}
|
|
})
|
|
}
|
|
dataLen := d.FieldU32("data_size")
|
|
|
|
switch {
|
|
case bytes.Equal(systemID, systemIDWidevine[:]):
|
|
d.FieldFormatLen("data", int64(dataLen)*8, &protoBufWidevineGroup, nil)
|
|
case bytes.Equal(systemID, systemIDPlayReady[:]):
|
|
d.FieldFormatLen("data", int64(dataLen)*8, &psshPlayreadyGroup, nil)
|
|
case systemID == nil:
|
|
fallthrough
|
|
default:
|
|
d.FieldRawLen("data", int64(dataLen)*8)
|
|
}
|
|
case "sinf":
|
|
decodeBoxes(ctx, d)
|
|
case "frma":
|
|
format := d.FieldUTF8("format", 4)
|
|
|
|
// set to original data format
|
|
// TODO: how to handle multiple descriptors? track current?
|
|
if t := ctx.currentTrack(); t != nil && len(t.sampleDescriptions) > 0 {
|
|
t.sampleDescriptions[0].originalFormat = format
|
|
}
|
|
case "schm":
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
d.FieldUTF8("encryption_type", 4)
|
|
d.FieldU16("encryption_version")
|
|
if d.BitsLeft() > 0 {
|
|
d.FieldUTF8("uri", int(d.BitsLeft())/8)
|
|
}
|
|
case "schi":
|
|
decodeBoxes(ctx, d)
|
|
case "btrt":
|
|
d.FieldU32("decoding_buffer_size")
|
|
d.FieldU32("max_bitrate")
|
|
d.FieldU32("avg_bitrate")
|
|
case "pasp":
|
|
d.FieldU32("h_spacing")
|
|
d.FieldU32("v_spacing")
|
|
case "uuid":
|
|
d.FieldRawLen("uuid", 16*8, scalar.RawUUID, uuidNames)
|
|
d.FieldRawLen("data", d.BitsLeft())
|
|
case "keys":
|
|
mb := ctx.currentMetaBox()
|
|
var kb *keysBox
|
|
if mb != nil {
|
|
kb = &keysBox{}
|
|
mb.keys = kb
|
|
}
|
|
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
entryCount := d.FieldU32("entry_count")
|
|
d.FieldArray("entries", func(d *decode.D) {
|
|
for i := uint64(0); i < entryCount; i++ {
|
|
d.FieldStruct("entry", func(d *decode.D) {
|
|
keySize := d.FieldU32("key_size")
|
|
namespace := d.FieldUTF8("key_namespace", 4)
|
|
name := d.FieldUTF8("key_name", int(keySize)-8)
|
|
if kb != nil {
|
|
kb.keys = append(kb.keys, keysBoxKey{
|
|
namespace: namespace,
|
|
name: name,
|
|
})
|
|
}
|
|
})
|
|
}
|
|
})
|
|
case "wave":
|
|
decodeBoxes(ctx, d)
|
|
case "saiz":
|
|
d.FieldU8("version")
|
|
flags := d.FieldU24("flags")
|
|
if flags&0b1 != 0 {
|
|
d.FieldU32("aux_info_type")
|
|
d.FieldU32("aux_info_type_parameter")
|
|
}
|
|
defaultSampleInfoSize := d.FieldU8("default_sample_info_size")
|
|
sampleCount := d.FieldU32("sample_count")
|
|
if defaultSampleInfoSize == 0 {
|
|
d.FieldArray("sample_size_info_table", func(d *decode.D) {
|
|
for i := uint64(0); i < sampleCount; i++ {
|
|
d.FieldU8("sample_size")
|
|
}
|
|
})
|
|
}
|
|
case "sgpd":
|
|
version := d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
var groupingType = d.FieldUTF8("grouping_type", 4)
|
|
var defaultLength uint64
|
|
if version == 1 {
|
|
defaultLength = d.FieldU32("default_length")
|
|
} else if version >= 2 {
|
|
d.FieldU32("default_sample_description_index")
|
|
}
|
|
entryCount := d.FieldU32("entry_count")
|
|
|
|
d.FieldStructNArray("entries", "entry", int64(entryCount), func(d *decode.D) {
|
|
entryLen := defaultLength
|
|
if version == 1 {
|
|
if defaultLength == 0 {
|
|
entryLen = d.FieldU32("description_length")
|
|
} else if entryLen == 0 {
|
|
d.Fatalf("sgpd groups entry len == 0")
|
|
}
|
|
} else if entryLen == 0 {
|
|
// TODO: this is likely a mistake: here version is != 1, so defaultLength is default (i.e. 0),
|
|
// TODO: so entryLen is also 0. So for version != 1 this fatal should always throw
|
|
d.Fatalf("sgpd groups entry len == 0")
|
|
}
|
|
// CENC Sample Encryption Info Entries
|
|
switch groupingType {
|
|
case "seig":
|
|
d.FieldU8("reserved")
|
|
d.FieldU4("crypto_bytes")
|
|
d.FieldU4("skip_bytes")
|
|
isEncrypted := d.FieldU8("is_encrypted")
|
|
perSampleIVSize := d.FieldU8("per_sample_iv_size")
|
|
d.FieldRawLen("kid", 8*16)
|
|
if isEncrypted != 0 {
|
|
// If perSampleIVSize > 0 then
|
|
if perSampleIVSize == 0 {
|
|
// This means whole fragment is encrypted with a constant IV
|
|
iVSize := d.FieldU8("constant_iv_size")
|
|
d.FieldRawLen("constant_iv", 8*int64(iVSize))
|
|
}
|
|
}
|
|
case "roll":
|
|
d.FieldU16("roll_distance")
|
|
default:
|
|
d.FieldRawLen("data", int64(entryLen)*8)
|
|
}
|
|
})
|
|
case "sbgp":
|
|
version := d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
|
|
d.FieldUTF8("grouping_type", 4)
|
|
if version == 1 {
|
|
d.FieldU32("grouping_type_parameter")
|
|
}
|
|
entryCount := d.FieldU32("entry_count")
|
|
d.FieldArray("entries", func(d *decode.D) {
|
|
for i := uint64(0); i < entryCount; i++ {
|
|
d.FieldStruct("entry", func(d *decode.D) {
|
|
d.FieldU32("sample_count")
|
|
d.FieldU32("group_description_index")
|
|
})
|
|
}
|
|
})
|
|
case "saio":
|
|
version := d.FieldU8("version")
|
|
flags := d.FieldU24("flags")
|
|
|
|
if flags&0b1 != 0 {
|
|
d.FieldU32("aux_info_type")
|
|
d.FieldU32("aux_info_type_parameter")
|
|
}
|
|
entryCount := d.FieldU32("entry_count")
|
|
d.FieldArray("entries", func(d *decode.D) {
|
|
for i := uint64(0); i < entryCount; i++ {
|
|
if version == 0 {
|
|
d.FieldU32("offset")
|
|
} else {
|
|
d.FieldU64("offset")
|
|
}
|
|
}
|
|
})
|
|
case "senc":
|
|
d.FieldU8("version")
|
|
flags := d.FieldU24("flags")
|
|
|
|
t := ctx.currentTrack()
|
|
if t == nil {
|
|
// need to know iv size
|
|
return
|
|
}
|
|
m := &moof{}
|
|
if t := ctx.currentTrafBox(); t != nil {
|
|
m = t.moof
|
|
}
|
|
|
|
s := senc{}
|
|
sampleCount := d.FieldU32("sample_count")
|
|
d.FieldArray("samples", func(d *decode.D) {
|
|
for i := uint64(0); i < sampleCount; i++ {
|
|
d.FieldStruct("entry", func(d *decode.D) {
|
|
if t.defaultIVSize != 0 {
|
|
d.FieldRawLen("iv", int64(t.defaultIVSize*8))
|
|
}
|
|
if flags&0b10 != 0 {
|
|
subSampleCount := d.FieldU16("subsample_count")
|
|
d.FieldArray("subsamples", func(d *decode.D) {
|
|
for i := uint64(0); i < subSampleCount; i++ {
|
|
d.FieldStruct("entry", func(d *decode.D) {
|
|
d.FieldU16("bytes_of_clean_data")
|
|
d.FieldU32("bytes_of_encrypted_data")
|
|
})
|
|
}
|
|
})
|
|
}
|
|
})
|
|
|
|
// TODO: add iv etc
|
|
s.entries = append(s.entries, struct{}{})
|
|
}
|
|
})
|
|
m.sencs = append(m.sencs, s)
|
|
case "tenc":
|
|
version := d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
|
|
d.FieldU8("reserved0")
|
|
switch version {
|
|
case 0:
|
|
d.FieldU8("reserved1")
|
|
default:
|
|
d.FieldU4("default_crypto_bytes")
|
|
d.FieldU4("default_skip_bytes")
|
|
}
|
|
|
|
defaultIsEncrypted := d.FieldU8("default_is_encrypted")
|
|
defaultIVSize := d.FieldU8("default_iv_size")
|
|
d.FieldRawLen("default_kid", 8*16)
|
|
|
|
if defaultIsEncrypted != 0 && defaultIVSize == 0 {
|
|
defaultConstantIVSize := d.FieldU8("default_constant_iv_size")
|
|
d.FieldRawLen("default_constant_iv", int64(defaultConstantIVSize)*8)
|
|
}
|
|
if t := ctx.currentTrack(); t != nil {
|
|
t.defaultIVSize = int(defaultIVSize)
|
|
}
|
|
case "covr":
|
|
decodeBoxes(ctx, d)
|
|
case "dec3":
|
|
d.FieldU13("data_rate")
|
|
d.FieldU3("num_ind_sub")
|
|
d.FieldU2("fscod")
|
|
d.FieldU5("bsid")
|
|
d.FieldU5("bsmod")
|
|
d.FieldU3("acmod")
|
|
d.FieldU1("lfeon")
|
|
d.FieldU3("reserved0")
|
|
numDepSub := d.FieldU4("num_dep_sub")
|
|
if numDepSub > 0 {
|
|
d.FieldU9("chan_loc")
|
|
} else {
|
|
d.FieldU1("reserved1")
|
|
}
|
|
|
|
if d.BitsLeft() >= 16 {
|
|
d.FieldU7("reserved2")
|
|
ec3JocFlag := d.FieldBool("ec3_job_flag")
|
|
if ec3JocFlag {
|
|
d.FieldU1("ec3_job_complexity")
|
|
}
|
|
}
|
|
case "dac4":
|
|
d.FieldU3("ac4_dsi_version")
|
|
bitstreamVersion := d.FieldU7("bitstream_version")
|
|
d.FieldU1("fs_index")
|
|
d.FieldU4("frame_rate_index")
|
|
d.FieldU9("n_presentation")
|
|
|
|
if bitstreamVersion > 1 {
|
|
hasProgramID := d.FieldBool("has_program_id")
|
|
if hasProgramID {
|
|
d.FieldU16("short_program_id")
|
|
hasUUID := d.FieldBool("has_uuid")
|
|
if hasUUID {
|
|
d.FieldRawLen("uuid", 16*8)
|
|
}
|
|
}
|
|
}
|
|
|
|
// if ac4DsiVersion == 1 {
|
|
// d.FieldU2("bit_rate_mode")
|
|
// d.FieldU32("bit_rate")
|
|
// d.FieldU32("bit_rate_precision")
|
|
// }
|
|
|
|
// if ac4DsiVersion == 1 {
|
|
|
|
// d.FieldArray("presentations", func(d *decode.D) {
|
|
// for i := uint64(0); i < nPresentation; i++ {
|
|
// d.FieldStruct("presentation", func(d *decode.D) {
|
|
// d.FieldU8("presentation_version")
|
|
// presBytes := d.FieldUintFn("pres_bytes", func() (uint64, decode.DisplayFormat, string) {
|
|
// n := d.U8()
|
|
// if n == 0x0ff {
|
|
// n += d.U16()
|
|
// }
|
|
// return n, decode.NumberDecimal, ""
|
|
// })
|
|
// d.FieldRawLen("data", int64(presBytes)*8)
|
|
// })
|
|
// }
|
|
// })
|
|
// }
|
|
|
|
if d.BitsLeft() > 0 {
|
|
d.FieldRawLen("data", d.BitsLeft())
|
|
}
|
|
case "tapt":
|
|
decodeBoxes(ctx, d)
|
|
case "clef":
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
d.FieldFP32("width")
|
|
d.FieldFP32("height")
|
|
case "prof":
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
d.FieldFP32("width")
|
|
d.FieldFP32("height")
|
|
case "enof":
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
d.FieldFP32("width")
|
|
d.FieldFP32("height")
|
|
case "clap":
|
|
d.FieldU32("aperture_width_n")
|
|
d.FieldU32("aperture_width_d")
|
|
d.FieldU32("aperture_height_n")
|
|
d.FieldU32("aperture_height_d")
|
|
d.FieldU32("horiz_off_n")
|
|
d.FieldU32("horiz_off_d")
|
|
d.FieldU32("vert_off_n")
|
|
d.FieldU32("vert_off_d")
|
|
case "smhd":
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
d.FieldFP16("balance")
|
|
d.FieldU16("reserved")
|
|
case "colr":
|
|
parameterType := d.FieldUTF8("parameter_type", 4)
|
|
|
|
switch parameterType {
|
|
case "nclx", "nclc":
|
|
d.FieldU16("primaries_index", format.ISO_23091_2_ColourPrimariesMap)
|
|
d.FieldU16("transfer_function_index", format.ISO_23091_2_TransferCharacteristicMap)
|
|
d.FieldU16("matrix_index", format.ISO_23091_2_MatrixCoefficients)
|
|
switch parameterType {
|
|
case "nclx":
|
|
d.FieldU8("color_range")
|
|
}
|
|
case "prof":
|
|
d.FieldFormat("profile", &iccProfileGroup, nil)
|
|
default:
|
|
d.FieldRawLen("data", d.BitsLeft())
|
|
}
|
|
case "ispe":
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
d.FieldU32("image_width")
|
|
d.FieldU32("image_height")
|
|
case "ipma":
|
|
version := d.FieldU8("version")
|
|
flags := d.FieldU24("flags")
|
|
entryCount := d.FieldU32("entry_count")
|
|
d.FieldArray("entries", func(d *decode.D) {
|
|
for i := uint64(0); i < entryCount; i++ {
|
|
d.FieldStruct("entry", func(d *decode.D) {
|
|
if version < 1 {
|
|
d.FieldU16("item_id")
|
|
} else {
|
|
d.FieldU32("item_id")
|
|
}
|
|
associationCount := d.FieldU8("association_count")
|
|
d.FieldArray("associations", func(d *decode.D) {
|
|
for j := uint64(0); j < associationCount; j++ {
|
|
d.FieldStruct("association", func(d *decode.D) {
|
|
d.FieldBool("essential")
|
|
if flags&0b1 != 0 {
|
|
d.FieldU15("property_index")
|
|
} else {
|
|
d.FieldU7("item_id")
|
|
}
|
|
})
|
|
}
|
|
})
|
|
})
|
|
}
|
|
})
|
|
case "pitm":
|
|
version := d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
if version == 0 {
|
|
d.FieldU16("item_id")
|
|
} else {
|
|
d.FieldU32("item_id")
|
|
}
|
|
case "iref":
|
|
version := d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
decodeBoxesWithParentData(ctx, d, &irefBox{version: int(version)})
|
|
case "dimg":
|
|
decodeBoxIrefEntry(ctx, d)
|
|
case "thmb":
|
|
decodeBoxIrefEntry(ctx, d)
|
|
case "cdsc":
|
|
decodeBoxIrefEntry(ctx, d)
|
|
case "irot":
|
|
d.FieldU8("rotation", scalar.UintMapSymUint{
|
|
0: 0,
|
|
1: 90,
|
|
2: 180,
|
|
3: 270,
|
|
})
|
|
case "hnti":
|
|
decodeBoxes(ctx, d)
|
|
case "hint":
|
|
decodeBoxes(ctx, d)
|
|
case "pdin":
|
|
d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
d.FieldArray("entries", func(d *decode.D) {
|
|
for !d.End() {
|
|
d.FieldStruct("entry", func(d *decode.D) {
|
|
d.FieldU32("rate")
|
|
d.FieldU32("initial_delay")
|
|
})
|
|
}
|
|
})
|
|
case "cslg":
|
|
version := d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
switch version {
|
|
case 0:
|
|
d.FieldS32("composition_to_dts_shift")
|
|
d.FieldS32("least_decode_to_display_delta")
|
|
d.FieldS32("greatest_decode_to_display_delta")
|
|
d.FieldS32("composition_start_time")
|
|
d.FieldS32("composition_end_time")
|
|
case 1:
|
|
d.FieldS64("composition_to_dts_shift")
|
|
d.FieldS64("least_decode_to_display_delta")
|
|
d.FieldS64("greatest_decode_to_display_delta")
|
|
d.FieldS64("composition_start_time")
|
|
d.FieldS64("composition_end_time")
|
|
default:
|
|
d.FieldRawLen("data", d.BitsLeft())
|
|
}
|
|
case "emsg":
|
|
// https://aomediacodec.github.io/id3-emsg/
|
|
version := d.FieldU8("version")
|
|
d.FieldU24("flags")
|
|
var schemeIdUri string
|
|
switch version {
|
|
case 0:
|
|
schemeIdUri = d.FieldUTF8Null("scheme_id_uri")
|
|
d.FieldUTF8Null("value")
|
|
d.FieldU32("timescale")
|
|
d.FieldU32("presentation_time_delta")
|
|
d.FieldU32("event_duration")
|
|
d.FieldU32("id")
|
|
case 1:
|
|
d.FieldU32("timescale")
|
|
d.FieldU64("presentation_time")
|
|
d.FieldU32("event_duration")
|
|
d.FieldU32("id")
|
|
schemeIdUri = d.FieldUTF8Null("scheme_id_uri")
|
|
d.FieldUTF8Null("value")
|
|
default:
|
|
d.FieldRawLen("data", d.BitsLeft())
|
|
}
|
|
switch schemeIdUri {
|
|
case "https://aomedia.org/emsg/ID3":
|
|
d.FieldFormat("message_data", &id3v2Group, nil)
|
|
default:
|
|
d.FieldRawLen("message_data", d.BitsLeft())
|
|
}
|
|
default:
|
|
// there are at least 4 ways to encode udta metadata in mov/mp4 files.
|
|
//
|
|
// mdta subtype:
|
|
//
|
|
// udta:
|
|
// meta
|
|
// hdlr with subtype "mdta"
|
|
// keys with 1-based <index> to key namespace.name table
|
|
// ilst
|
|
// <index>-box (box type is 32bit BE 1-based number into table above)
|
|
// data box with value
|
|
//
|
|
// mdir subtype:
|
|
//
|
|
// udta
|
|
// meta
|
|
// hdlr with subtype "mdir"
|
|
// ilst
|
|
// ©<abc> or similar
|
|
// data with value
|
|
//
|
|
// no-meta-box with length and language:
|
|
//
|
|
// udta
|
|
// ©<abc> or similar
|
|
// value length and language
|
|
//
|
|
// no-meta-box value rest of box:
|
|
//
|
|
// udta
|
|
// <name>
|
|
// value rest of box
|
|
if mb := ctx.currentMetaBox(); mb != nil && ctx.parent().typ == "ilst" {
|
|
// unknown type under a meta box with ilst as parent, decode as boxes
|
|
// is probably one or more data boxes
|
|
decodeBoxes(ctx, d)
|
|
} else if ctx.parent().typ == "udta" {
|
|
// TODO: better probe? ffmpeg uses box name heuristics?
|
|
// if 16 length field seems to match assume box with length, language and value
|
|
// otherwise decode as box with value rest of box
|
|
|
|
// only probe if there is something
|
|
probeLength := int64(0)
|
|
if d.BitsLeft() >= 16 {
|
|
probeLength = int64(d.PeekUintBits(16))
|
|
}
|
|
// +2 for length field, +2 for language field
|
|
if (probeLength+2+2)*8 == d.BitsLeft() {
|
|
length := d.FieldU16("length")
|
|
d.FieldStrFn("language", decodeLang)
|
|
d.FieldUTF8("value", int(length))
|
|
} else {
|
|
d.FieldUTF8("value", int(d.BitsLeft()/8))
|
|
}
|
|
} else {
|
|
d.FieldRawLen("data", d.BitsLeft())
|
|
}
|
|
}
|
|
}
|