#include <u.h>#include <libc.h>#include <bio.h>#include "ebml.h" static Elspec els[] = {	{EChapterDisplay, "ChapterDisplay", Emaster},	{ETrackType, "TrackType", Eunsigned},	{EChapString, "ChapString", Eunicode},	{ECodecID, "CodecID", Eascii},	{EFlagDefault, "FlagDefault", Eunsigned},	{EChapterTrackUID, "ChapterTrackUID", Eunsigned},	{ESlices, "Slices", Emaster},	{EChapterTrack, "ChapterTrack", Emaster},	{EChapterTimeStart, "ChapterTimeStart", Eunsigned},	{EChapterTimeEnd, "ChapterTimeEnd", Eunsigned},	{ECueRefTime, "CueRefTime", Eunsigned},	{ECueRefCluster, "CueRefCluster", Eunsigned},	{EChapterFlagHidden, "ChapterFlagHidden", Eunsigned},	{EFlagInterlaced, "FlagInterlaced", Eunsigned},	{EBlockDuration, "BlockDuration", Eunsigned},	{EFlagLacing, "FlagLacing", Eunsigned},	{EFieldOrder, "FieldOrder", Eunsigned},	{EChannels, "Channels", Eunsigned},	{EBlockGroup, "BlockGroup", Emaster},	{EBlock, "Block", Ebinary},	{EBlockVirtual, "BlockVirtual", Ebinary},	{ESimpleBlock, "SimpleBlock", Ebinary},	{ECodecState, "CodecState", Ebinary},	{EBlockAdditional, "BlockAdditional", Ebinary},	{EBlockMore, "BlockMore", Emaster},	{EPosition, "Position", Eunsigned},	{ECodecDecodeAll, "CodecDecodeAll", Eunsigned},	{EPrevSize, "PrevSize", Eunsigned},	{ETrackEntry, "TrackEntry", Emaster},	{EEncryptedBlock, "EncryptedBlock", Ebinary},	{EPixelWidth, "PixelWidth", Eunsigned},	{ECueDuration, "CueDuration", Eunsigned},	{ECueTime, "CueTime", Eunsigned},	{ESamplingFrequency, "SamplingFrequency", Efloat},	{EChapterAtom, "ChapterAtom", Emaster},	{ECueTrackPositions, "CueTrackPositions", Emaster},	{EFlagEnabled, "FlagEnabled", Eunsigned},	{EPixelHeight, "PixelHeight", Eunsigned},	{ECuePoint, "CuePoint", Emaster},	{ECRC32, "CRC-32", Ebinary},	{EReferenceFrame, "ReferenceFrame", Emaster},	{EReferenceOffset, "ReferenceOffset", Eunsigned},	{EReferenceTimestamp, "ReferenceTimestamp", Eunsigned},	{EBlockAdditionID, "BlockAdditionID", Eunsigned},	{ELaceNumber, "LaceNumber", Eunsigned},	{EFrameNumber, "FrameNumber", Eunsigned},	{EDelay, "Delay", Eunsigned},	{ESliceDuration, "SliceDuration", Eunsigned},	{ETrackNumber, "TrackNumber", Eunsigned},	{ECueReference, "CueReference", Emaster},	{EVideo, "Video", Emaster},	{EAudio, "Audio", Emaster},	{ETrackOperation, "TrackOperation", Emaster},	{ETrackCombinePlanes, "TrackCombinePlanes", Emaster},	{ETrackPlane, "TrackPlane", Emaster},	{ETrackPlaneUID, "TrackPlaneUID", Eunsigned},	{ETrackPlaneType, "TrackPlaneType", Eunsigned},	{ETimestamp, "Timestamp", Eunsigned},	{ETimeSlice, "TimeSlice", Emaster},	{ETrackJoinBlocks, "TrackJoinBlocks", Emaster},	{ECueCodecState, "CueCodecState", Eunsigned},	{ECueRefCodecState, "CueRefCodecState", Eunsigned},	{EVoid, "Void", Ebinary},	{ETrackJoinUID, "TrackJoinUID", Eunsigned},	{EBlockAddID, "BlockAddID", Eunsigned},	{ECueRelativePosition, "CueRelativePosition", Eunsigned},	{ECueClusterPosition, "CueClusterPosition", Eunsigned},	{ECueTrack, "CueTrack", Eunsigned},	{EReferencePriority, "ReferencePriority", Eunsigned},	{EReferenceBlock, "ReferenceBlock", Esigned},	{EReferenceVirtual, "ReferenceVirtual", Esigned},	{EBlockAddIDName, "BlockAddIDName", Eascii},	{EBlockAdditionMapping, "BlockAdditionMapping", Emaster},	{EBlockAddIDType, "BlockAddIDType", Eunsigned},	{EBlockAddIDExtraData, "BlockAddIDExtraData", Ebinary},	{EBlockAddIDValue, "BlockAddIDValue", Eunsigned},	{EContentCompAlgo, "ContentCompAlgo", Eunsigned},	{EContentCompSettings, "ContentCompSettings", Ebinary},	{EDocTypeExtension, "DocTypeExtension", Emaster},	{EDocType, "DocType", Eascii},	{EDocTypeExtensionName, "DocTypeExtensionName", Eascii},	{EDocTypeExtensionVersion, "DocTypeExtensionVersion", Eunsigned},	{EDocTypeReadVersion, "DocTypeReadVersion", Eunsigned},	{EEBMLVersion, "EBMLVersion", Eunsigned},	{EDocTypeVersion, "DocTypeVersion", Eunsigned},	{EEBMLMaxIDLength, "EBMLMaxIDLength", Eunsigned},	{EEBMLMaxSizeLength, "EBMLMaxSizeLength", Eunsigned},	{EEBMLReadVersion, "EBMLReadVersion", Eunsigned},	{EChapLanguage, "ChapLanguage", Eascii},	{EChapLanguageIETF, "ChapLanguageIETF", Eascii},	{EChapCountry, "ChapCountry", Eascii},	{ESegmentFamily, "SegmentFamily", Ebinary},	{EDateUTC, "DateUTC", Etimestamp},	{ETagLanguage, "TagLanguage", Eascii},	{ETagLanguageIETF, "TagLanguageIETF", Eascii},	{ETagDefault, "TagDefault", Eunsigned},	{ETagBinary, "TagBinary", Ebinary},	{ETagString, "TagString", Eunicode},	{EDuration, "Duration", Efloat},	{EChapProcessPrivate, "ChapProcessPrivate", Ebinary},	{EChapterFlagEnabled, "ChapterFlagEnabled", Eunsigned},	{ETagName, "TagName", Eunicode},	{EEditionEntry, "EditionEntry", Emaster},	{EEditionUID, "EditionUID", Eunsigned},	{EEditionFlagHidden, "EditionFlagHidden", Eunsigned},	{EEditionFlagDefault, "EditionFlagDefault", Eunsigned},	{EEditionFlagOrdered, "EditionFlagOrdered", Eunsigned},	{EFileData, "FileData", Ebinary},	{EFileMimeType, "FileMimeType", Eascii},	{EFileUsedStartTime, "FileUsedStartTime", Eunsigned},	{EFileUsedEndTime, "FileUsedEndTime", Eunsigned},	{EFileName, "FileName", Eunicode},	{EFileReferral, "FileReferral", Ebinary},	{EFileDescription, "FileDescription", Eunicode},	{EFileUID, "FileUID", Eunsigned},	{EContentEncAlgo, "ContentEncAlgo", Eunsigned},	{EContentEncKeyID, "ContentEncKeyID", Ebinary},	{EContentSignature, "ContentSignature", Ebinary},	{EContentSigKeyID, "ContentSigKeyID", Ebinary},	{EContentSigAlgo, "ContentSigAlgo", Eunsigned},	{EContentSigHashAlgo, "ContentSigHashAlgo", Eunsigned},	{EContentAESSettings, "ContentAESSettings", Emaster},	{EAESSettingsCipherMode, "AESSettingsCipherMode", Eunsigned},	{EMuxingApp, "MuxingApp", Eunicode},	{ESeek, "Seek", Emaster},	{EContentEncodingOrder, "ContentEncodingOrder", Eunsigned},	{EContentEncodingScope, "ContentEncodingScope", Eunsigned},	{EContentEncodingType, "ContentEncodingType", Eunsigned},	{EContentCompression, "ContentCompression", Emaster},	{EContentEncryption, "ContentEncryption", Emaster},	{ECueRefNumber, "CueRefNumber", Eunsigned},	{EName, "Name", Eunicode},	{ECueBlockNumber, "CueBlockNumber", Eunsigned},	{ETrackOffset, "TrackOffset", Esigned},	{ESeekID, "SeekID", Ebinary},	{ESeekPosition, "SeekPosition", Eunsigned},	{EStereoMode, "StereoMode", Eunsigned},	{EOldStereoMode, "OldStereoMode", Eunsigned},	{EAlphaMode, "AlphaMode", Eunsigned},	{EPixelCropBottom, "PixelCropBottom", Eunsigned},	{EDisplayWidth, "DisplayWidth", Eunsigned},	{EDisplayUnit, "DisplayUnit", Eunsigned},	{EAspectRatioType, "AspectRatioType", Eunsigned},	{EDisplayHeight, "DisplayHeight", Eunsigned},	{EPixelCropTop, "PixelCropTop", Eunsigned},	{EPixelCropLeft, "PixelCropLeft", Eunsigned},	{EPixelCropRight, "PixelCropRight", Eunsigned},	{EFlagForced, "FlagForced", Eunsigned},	{EColour, "Colour", Emaster},	{EMatrixCoefficients, "MatrixCoefficients", Eunsigned},	{EBitsPerChannel, "BitsPerChannel", Eunsigned},	{EChromaSubsamplingHorz, "ChromaSubsamplingHorz", Eunsigned},	{EChromaSubsamplingVert, "ChromaSubsamplingVert", Eunsigned},	{ECbSubSamplingHorz, "CbSubSamplingHorz", Eunsigned},	{ECbSubSamplingVert, "CbSubSamplingVert", Eunsigned},	{EChromaSitingHorz, "ChromaSitingHorz", Eunsigned},	{EChromaSitingVert, "ChromaSitingVert", Eunsigned},	{ERange, "Range", Eunsigned},	{ETransferCharacteristics, "TransferCharacteristics", Eunsigned},	{EPrimaries, "Primaries", Eunsigned},	{EMaxCLL, "MaxCLL", Eunsigned},	{EMaxFALL, "MaxFALL", Eunsigned},	{EMasteringMetadata, "MasteringMetadata", Emaster},	{EPrimaryRChromaticityX, "PrimaryRChromaticityX", Efloat},	{EPrimaryRChromaticityY, "PrimaryRChromaticityY", Efloat},	{EPrimaryGChromaticityX, "PrimaryGChromaticityX", Efloat},	{EPrimaryGChromaticityY, "PrimaryGChromaticityY", Efloat},	{EPrimaryBChromaticityX, "PrimaryBChromaticityX", Efloat},	{EPrimaryBChromaticityY, "PrimaryBChromaticityY", Efloat},	{EWhitePointChromaticityX, "WhitePointChromaticityX", Efloat},	{EWhitePointChromaticityY, "WhitePointChromaticityY", Efloat},	{ELuminanceMax, "LuminanceMax", Efloat},	{ELuminanceMin, "LuminanceMin", Efloat},	{EMaxBlockAdditionID, "MaxBlockAdditionID", Eunsigned},	{EChapterStringUID, "ChapterStringUID", Eunicode},	{ECodecDelay, "CodecDelay", Eunsigned},	{ESeekPreRoll, "SeekPreRoll", Eunsigned},	{EWritingApp, "WritingApp", Eunicode},	{ESilentTracks, "SilentTracks", Emaster},	{ESilentTrackNumber, "SilentTrackNumber", Eunsigned},	{EAttachedFile, "AttachedFile", Emaster},	{EContentEncoding, "ContentEncoding", Emaster},	{EBitDepth, "BitDepth", Eunsigned},	{ECodecPrivate, "CodecPrivate", Ebinary},	{ETargets, "Targets", Emaster},	{EChapterPhysicalEquiv, "ChapterPhysicalEquiv", Eunsigned},	{ETagChapterUID, "TagChapterUID", Eunsigned},	{ETagTrackUID, "TagTrackUID", Eunsigned},	{ETagAttachmentUID, "TagAttachmentUID", Eunsigned},	{ETagEditionUID, "TagEditionUID", Eunsigned},	{ETargetType, "TargetType", Eascii},	{ETrackTranslate, "TrackTranslate", Emaster},	{ETrackTranslateTrackID, "TrackTranslateTrackID", Ebinary},	{ETrackTranslateCodec, "TrackTranslateCodec", Eunsigned},	{ETrackTranslateEditionUID, "TrackTranslateEditionUID", Eunsigned},	{ESimpleTag, "SimpleTag", Emaster},	{ETargetTypeValue, "TargetTypeValue", Eunsigned},	{EChapProcessCommand, "ChapProcessCommand", Emaster},	{EChapProcessTime, "ChapProcessTime", Eunsigned},	{EChapterTranslate, "ChapterTranslate", Emaster},	{EChapProcessData, "ChapProcessData", Ebinary},	{EChapProcess, "ChapProcess", Emaster},	{EChapProcessCodecID, "ChapProcessCodecID", Eunsigned},	{EChapterTranslateID, "ChapterTranslateID", Ebinary},	{EChapterTranslateCodec, "ChapterTranslateCodec", Eunsigned},	{EChapterTranslateEditionUID, "ChapterTranslateEditionUID", Eunsigned},	{EContentEncodings, "ContentEncodings", Emaster},	{EMinCache, "MinCache", Eunsigned},	{EMaxCache, "MaxCache", Eunsigned},	{EChapterSegmentUID, "ChapterSegmentUID", Ebinary},	{EChapterSegmentEditionUID, "ChapterSegmentEditionUID", Eunsigned},	{ETrackOverlay, "TrackOverlay", Eunsigned},	{ETag, "Tag", Emaster},	{ESegmentFilename, "SegmentFilename", Eunicode},	{ESegmentUID, "SegmentUID", Ebinary},	{EChapterUID, "ChapterUID", Eunsigned},	{ETrackUID, "TrackUID", Eunsigned},	{EAttachmentLink, "AttachmentLink", Eunsigned},	{EBlockAdditions, "BlockAdditions", Emaster},	{EDiscardPadding, "DiscardPadding", Esigned},	{EProjection, "Projection", Emaster},	{EProjectionType, "ProjectionType", Eunsigned},	{EProjectionPrivate, "ProjectionPrivate", Ebinary},	{EProjectionPoseYaw, "ProjectionPoseYaw", Efloat},	{EProjectionPosePitch, "ProjectionPosePitch", Efloat},	{EProjectionPoseRoll, "ProjectionPoseRoll", Efloat},	{EOutputSamplingFrequency, "OutputSamplingFrequency", Efloat},	{ETitle, "Title", Eunicode},	{EChannelPositions, "ChannelPositions", Ebinary},	{ELanguage, "Language", Eascii},	{ELanguageIETF, "LanguageIETF", Eascii},	{ETrackTimestampScale, "TrackTimestampScale", Efloat},	{EDefaultDecodedFieldDuration, "DefaultDecodedFieldDuration", Eunsigned},	{EFrameRate, "FrameRate", Efloat},	{EDefaultDuration, "DefaultDuration", Eunsigned},	{ECodecName, "CodecName", Eunicode},	{ECodecDownloadURL, "CodecDownloadURL", Eascii},	{ETimestampScale, "TimestampScale", Eunsigned},	{EColourSpace, "ColourSpace", Ebinary},	{EGammaValue, "GammaValue", Efloat},	{ECodecSettings, "CodecSettings", Eunicode},	{ECodecInfoURL, "CodecInfoURL", Eascii},	{EPrevFilename, "PrevFilename", Eunicode},	{EPrevUID, "PrevUID", Ebinary},	{ENextFilename, "NextFilename", Eunicode},	{ENextUID, "NextUID", Ebinary},	{EChapters, "Chapters", Emaster},	{ESeekHead, "SeekHead", Emaster},	{ETags, "Tags", Emaster},	{EInfo, "Info", Emaster},	{ETracks, "Tracks", Emaster},	{ESegment, "Segment", Emaster},	{EAttachments, "Attachments", Emaster},	{EEBML, "EBML", Emaster},	{ECues, "Cues", Emaster},	{ECluster, "Cluster", Emaster},}; static Elspec *elspec(vlong id){	Elspec *p, *t;	int m, n; 	n = nelem(els);	t = els;	while(n > 1){		m = n/2;		p = t + m;		if(id >= p->id) {			t = p;			n = n-m;		} else			n = m;	} 	return id == t->id ? t : nil;} intebmluintb(u8int *b, vlong sz, vlong *out){	uvlong v, m;	int c, n; 	*out = 0;	for(n = 1, m = 0x80, v = 0; n <= 8; v <<= 8, m <<= 7, n++){		if(n-1 >= sz){			werrstr("eof");			return -1;		}		c = b[n-1];		if(n == 1 && c == 0){			werrstr("invalid number: %02x", c);			return -1;		}		v |= c;		if(v & m){			*out = v & ~m;			return n;		}		v &= ~m;	}	werrstr("number overflow"); 	return -1;} intebmlsintb(u8int *b, vlong sz, vlong *out){	int n; 	if((n = ebmluintb(b, sz, out)) < 0)		return -1;	*out -= (1 << n*7-1) - 1; 	return n;} static int_ebmluint(Biobuf *f, vlong *out, vlong sz, int isid){	uvlong v, m;	int c, n, i; 	*out = 0;	for(i = 0, n = 1, m = 0x80, v = 0; i < sz && n <= 8; v <<= 8, m <<= 7, n++){		if((c = Bgetc(f)) < 0){			werrstr("eof");			return -1;		}		if(n == 1 && c == 0){			werrstr("invalid number: %02x at %#llux", c, Boffset(f));			return -1;		}		v |= c;		if(v & m){			*out = isid ? v : (v & ~m);			if(!isid && *out == (1<<(7*n))-1) /* unknown size */				*out = -1;			return n;		}		if(!isid)			v &= ~m;	}	if(i >= sz)		werrstr("ebmluint: short read");	else		werrstr("ebmluint: overflow"); 	return -1;} intebmluint(Biobuf *f, vlong sz, vlong *out){	return _ebmluint(f, out, sz, 0);} intebmlid(Biobuf *f, vlong sz, vlong *out){	return _ebmluint(f, out, sz, 1);} intebmlsint(Biobuf *f, vlong sz, vlong *out){	int n; 	if((n = ebmluint(f, sz, out)) < 0)		return -1;	*out -= (1 << n*7-1) - 1; 	return n;} intebmlfloat(Biobuf *f, vlong sz, double *out){	u32int u;	union {		uchar b[8];		u32int u[2];		float f;		double d;	}x; 	if(sz != 4 && sz != 8){		werrstr("invalid float size %lld", sz);		return -1;	}	if(Bread(f, x.b, sz) != sz)		return -1; 	if(sz == 4){		x.u[0] = (x.u[0]&0xff000000)>>24 | (x.u[0]&0x00ff0000)>>8 | (x.u[0]&0x0000ff00)<<8 | (x.u[0]&0x000000ff)<<24;		*out = x.f;	}else if(sz == 8){		u = (x.u[0]&0xff000000)>>24 | (x.u[0]&0x00ff0000)>>8 | (x.u[0]&0x0000ff00)<<8 | (x.u[0]&0x000000ff)<<24;		x.u[0] = (x.u[1]&0xff000000)>>24 | (x.u[1]&0x00ff0000)>>8 | (x.u[1]&0x0000ff00)<<8 | (x.u[1]&0x000000ff)<<24;		x.u[1] = u;		*out = x.d;	} 	return 0;} vlongebmlel(Biobuf *f, vlong sz, Elspec *el, vlong *esz){	vlong x, n, r;	Elspec *s; 	if(Bgetc(f) < 0)		return 0;	Bungetc(f); 	r = ebmlid(f, sz, &x);	n = r;	if(r >= sz || r < 0){		werrstr("id: %r");		return -1;	}	if((s = elspec(x)) != nil){		*el = *s;		el->id = x;		r = ebmluint(f, sz-n, &x);		n += r;		if(n >= sz || r < 0 || sz-n < x){			werrstr("sz: (sz=%lld n=%lld r=%lld x=%lld): %r", sz, n, r, x);			return -1;		}		*esz = x;	}else{ /* skip invalid elements */		while(--n > 0)			Bungetc(f);		el->id = x;		el->type = -1;		*esz = 0;		return 0;	} 	return n;} vlongebmlrawuint(Biobuf *f, vlong sz, vlong *dst){	vlong i;	int c; 	*dst = 0;	for(i = 0; i < sz; i++){		*dst <<= 8;		if((c = Bgetc(f)) < 0){			werrstr("eof");			return -1;		}		*dst |= c;	} 	return 0;} vlongebmlrawsint(Biobuf *f, vlong sz, vlong *dst){	vlong i, x;	int c; 	x = 0;	for(i = 0; i < sz; i++){		x <<= 8;		if((c = Bgetc(f)) < 0){			werrstr("eof");			return -1;		}		x |= c;	}	if(x & (0x80ULL<<(i-1)))		*dst = -(~x + 1);	else		*dst = x; 	return 0;} char *ebmltracktype(int t){	static char *types[] = {		[Etrackvideo] = "video",

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