mirror of
https://github.com/wader/fq.git
synced 2024-11-26 21:55:57 +03:00
1263 lines
37 KiB
Go
1263 lines
37 KiB
Go
package mp4
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// TODO: flags?
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import (
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"bytes"
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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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)
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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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var boxAliases = map[string]string{
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"styp": "ftyp",
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}
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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.UToScalar{
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boxSizeRestOfFile: scalar.S{Description: "Rest of file"},
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boxSizeUse64bitSize: scalar.S{Description: "Use 64 bit size"},
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}
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var mediaTimeNames = scalar.SToScalar{
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-1: {Description: "empty"},
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}
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var subTypeNames = scalar.StrToScalar{
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"alis": {Description: "Alias Data"},
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"camm": {Description: "Camera Metadata"},
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"crsm": {Description: "Clock Reference"},
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"data": {Description: "Data"},
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"hint": {Description: "Hint Track"},
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"ipsm": {Description: "IPMP"},
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"m7sm": {Description: "MPEG-7 Stream"},
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"mdir": {Description: "Metadata"},
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"mdta": {Description: "Metadata Tags"},
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"meta": {Description: "NRT Metadata"},
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"mjsm": {Description: "MPEG-J"},
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"nrtm": {Description: "Non-Real Time Metadata"},
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"ocsm": {Description: "Object Content"},
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"odsm": {Description: "Object Descriptor"},
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"pict": {Description: "Picture"},
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"priv": {Description: "Private"},
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"psmd": {Description: "Panasonic Static Metadata"},
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"sbtl": {Description: "Subtitle"},
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"sdsm": {Description: "Scene Description"},
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"soun": {Description: "Audio Track"},
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"subp": {Description: "Subpicture"},
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"text": {Description: "Text"},
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"tmcd": {Description: "Time Code"},
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"url ": {Description: "URL"},
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"vide": {Description: "Video Track"},
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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.BytesToScalar{
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{Bytes: uuidIsmlManifestBytes[:], Scalar: scalar.S{Sym: "isml_manifest"}},
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{Bytes: uuidXmpBytes[:], Scalar: scalar.S{Sym: "xmp"}},
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{Bytes: uuidSphericalBytes[:], Scalar: scalar.S{Sym: "spherical"}},
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{Bytes: uuidPspUsmtBytes[:], Scalar: scalar.S{Sym: "psp_usmt"}},
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{Bytes: uuidTfxdBytes[:], Scalar: scalar.S{Sym: "tfxd"}},
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{Bytes: uuidTfrfBytes[:], Scalar: scalar.S{Sym: "tfrf"}},
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{Bytes: uuidProfBytes[:], Scalar: scalar.S{Sym: "prof"}},
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{Bytes: uuidIpodBytes[:], Scalar: scalar.S{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, 4, 0, 0, 0, 0, time.UTC)
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var quicktimeEpoch = scalar.Fn(func(s scalar.S) (scalar.S, error) {
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uv, ok := s.Actual.(uint64)
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if !ok {
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return s, nil
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}
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s.Sym = quicktimeEpochDate.Add(time.Second * time.Duration(uv)).Format(time.RFC3339)
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return s, nil
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})
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func decodeFieldMatrix(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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func decodeBox(ctx *decodeContext, d *decode.D) {
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var typ string
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var dataSize uint64
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boxSize := d.FieldU32("size", boxSizeNames)
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typ = d.FieldUTF8("type", 4, boxDescriptions)
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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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// TODO: add truncate to size option?
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// if dataSize > uint64(d.BitsLeft()/8) {
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// dataSize = uint64(d.BitsLeft() / 8)
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// }
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// TODO: not sure about this
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switch {
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case typ == "<22>too":
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typ = "_apple_list"
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case typ[0] == 0xa9:
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typ = "_apple_entry"
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}
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if a, ok := boxAliases[typ]; ok {
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typ = a
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}
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ctx.path = append(ctx.path, typ)
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if decodeFn, ok := boxDecoders[typ]; ok {
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d.LenFn(int64(dataSize*8), func(d *decode.D) {
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decodeFn(ctx, d)
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})
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} else {
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d.FieldRawLen("data", int64(dataSize*8))
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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) {
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d.FieldStructArrayLoop("boxes", "box", func() bool { return d.BitsLeft() >= 8*8 }, func(d *decode.D) {
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decodeBox(ctx, d)
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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.PeekBits(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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var boxDecoders map[string]func(ctx *decodeContext, d *decode.D)
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func init() {
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boxDecoders = map[string]func(ctx *decodeContext, d *decode.D){
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"ftyp": func(_ *decodeContext, d *decode.D) {
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d.FieldUTF8("major_brand", 4)
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d.FieldU32("minor_version")
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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.TrimSpace)
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i++
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})
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},
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"mvhd": func(_ *decodeContext, d *decode.D) {
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d.FieldU8("version")
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d.FieldU24("flags")
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d.FieldU32("creation_time", quicktimeEpoch)
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d.FieldU32("modification_time", quicktimeEpoch)
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d.FieldU32("time_scale")
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d.FieldU32("duration")
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d.FieldFP32("preferred_rate")
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d.FieldFP16("preferred_volume")
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d.FieldUTF8("reserved", 10)
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decodeFieldMatrix(d, "matrix_structure")
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d.FieldU32("preview_time")
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d.FieldU32("preview_duration")
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d.FieldU32("poster_time")
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d.FieldU32("selection_time")
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d.FieldU32("selection_duration")
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d.FieldU32("current_time")
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d.FieldU32("next_track_id")
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},
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"trak": decodeBoxes,
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"edts": decodeBoxes,
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"elst": func(_ *decodeContext, d *decode.D) {
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version := d.FieldU8("version")
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d.FieldU24("flags")
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entryCount := d.FieldU32("entry_count")
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var i uint64
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d.FieldStructArrayLoop("entries", "entry", func() bool { return i < entryCount }, func(d *decode.D) {
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d.FieldS32("segment_duration")
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d.FieldSFn("media_time", func(d *decode.D) int64 {
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var t int64
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if version == 0 {
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t = d.S32()
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} else {
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t = d.S64()
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}
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return t
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}, mediaTimeNames)
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d.FieldFP32("media_rate")
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i++
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})
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},
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"tref": decodeBoxes,
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"tkhd": func(ctx *decodeContext, d *decode.D) {
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d.FieldU8("version")
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d.FieldU24("flags")
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d.FieldU32("creation_time", quicktimeEpoch)
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d.FieldU32("modification_time", quicktimeEpoch)
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trackID := uint32(d.FieldU32("track_id"))
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d.FieldU32("reserved1")
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d.FieldU32("duration")
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d.FieldRawLen("reserved2", 8*8)
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d.FieldU16("layer")
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d.FieldU16("alternate_group")
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d.FieldFP16("volume")
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d.FieldU16("reserved3")
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decodeFieldMatrix(d, "matrix_structure")
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d.FieldFP32("track_width")
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d.FieldFP32("track_height")
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// TODO: dup track id?
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if _, ok := ctx.tracks[trackID]; !ok {
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t := &track{id: int(trackID)}
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ctx.tracks[trackID] = t
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ctx.currentTrack = t
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}
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},
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"mdia": decodeBoxes,
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"mdhd": func(_ *decodeContext, d *decode.D) {
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d.FieldU8("version")
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d.FieldU24("flags")
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// TODO: timestamps
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d.FieldU32("creation_time", quicktimeEpoch)
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d.FieldU32("modification_time", quicktimeEpoch)
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d.FieldU32("time_scale")
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d.FieldU32("duration")
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d.FieldStrFn("language", decodeLang)
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d.FieldU16("quality")
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},
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"vmhd": func(_ *decodeContext, d *decode.D) {
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d.FieldU8("version")
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d.FieldU24("flags")
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d.FieldU16("graphicsmode")
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d.FieldArray("opcolor", func(d *decode.D) {
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// TODO: is FP16?
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d.FieldU16("value")
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d.FieldU16("value")
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d.FieldU16("value")
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})
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},
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"hdlr": func(ctx *decodeContext, d *decode.D) {
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d.FieldU8("version")
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d.FieldU24("flags")
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d.FieldUTF8NullFixedLen("component_type", 4)
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subType := d.FieldUTF8("component_subtype", 4, subTypeNames, scalar.TrimSpace)
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d.FieldUTF8NullFixedLen("component_manufacturer", 4)
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d.FieldU32("component_flags")
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d.FieldU32("component_flags_mask")
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// TODO: sometimes has a length prefix byte, how to know?
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d.FieldUTF8NullFixedLen("component_name", int(d.BitsLeft()/8))
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if ctx.currentTrack != nil {
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// component_type seems to be all zero sometimes so can't look for "mhlr"
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switch subType {
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case "vide", "soun":
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ctx.currentTrack.subType = subType
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}
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}
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},
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"minf": decodeBoxes,
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"dinf": decodeBoxes,
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"dref": func(_ *decodeContext, d *decode.D) {
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d.FieldU8("version")
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d.FieldU24("flags")
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entryCount := d.FieldU32("entry_count")
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var i uint64
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d.FieldStructArrayLoop("boxes", "box", func() bool { return i < entryCount }, func(d *decode.D) {
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size := d.FieldU32("size")
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d.FieldUTF8("type", 4)
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d.FieldU8("version")
|
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d.FieldU24("flags")
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dataSize := size - 12
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d.FieldRawLen("data", int64(dataSize*8))
|
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i++
|
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})
|
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},
|
||
"stbl": decodeBoxes,
|
||
"stsd": func(ctx *decodeContext, d *decode.D) {
|
||
d.FieldU8("version")
|
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d.FieldU24("flags")
|
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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
|
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d.FieldArrayLoop("boxes", func() bool { return i < entryCount }, func(d *decode.D) {
|
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d.FieldStruct("box", func(d *decode.D) {
|
||
size := d.FieldU32("size")
|
||
dataFormat := d.FieldUTF8("type", 4)
|
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subType := ""
|
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if ctx.currentTrack != nil {
|
||
ctx.currentTrack.sampleDescriptions = append(ctx.currentTrack.sampleDescriptions, sampleDescription{
|
||
dataFormat: dataFormat,
|
||
})
|
||
subType = ctx.currentTrack.subType
|
||
}
|
||
|
||
d.LenFn(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.FieldU32("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++
|
||
})
|
||
},
|
||
"avcC": func(ctx *decodeContext, d *decode.D) {
|
||
dv, v := d.FieldFormat("descriptor", mpegAVCDCRFormat, nil)
|
||
avcDcrOut, ok := v.(format.AvcDcrOut)
|
||
if dv != nil && !ok {
|
||
panic(fmt.Sprintf("expected AvcDcrOut got %#+v", v))
|
||
}
|
||
if ctx.currentTrack != nil {
|
||
ctx.currentTrack.formatInArg = format.AvcIn{LengthSize: avcDcrOut.LengthSize} //nolint:gosimple
|
||
}
|
||
},
|
||
"hvcC": func(ctx *decodeContext, d *decode.D) {
|
||
dv, v := d.FieldFormat("descriptor", mpegHEVCDCRFrameFormat, nil)
|
||
hevcDcrOut, ok := v.(format.HevcDcrOut)
|
||
if dv != nil && !ok {
|
||
panic(fmt.Sprintf("expected HevcDcrOut got %#+v", v))
|
||
}
|
||
if ctx.currentTrack != nil {
|
||
ctx.currentTrack.formatInArg = format.HevcIn{LengthSize: hevcDcrOut.LengthSize} //nolint:gosimple
|
||
}
|
||
},
|
||
"dfLa": func(ctx *decodeContext, d *decode.D) {
|
||
d.FieldU8("version")
|
||
d.FieldU24("flags")
|
||
dv, v := d.FieldFormat("descriptor", flacMetadatablocksFormat, nil)
|
||
flacMetadatablockOut, ok := v.(format.FlacMetadatablocksOut)
|
||
if dv != nil && !ok {
|
||
panic(fmt.Sprintf("expected FlacMetadatablockOut got %#+v", v))
|
||
}
|
||
if flacMetadatablockOut.HasStreamInfo {
|
||
if ctx.currentTrack != nil {
|
||
ctx.currentTrack.formatInArg = format.FlacFrameIn{StreamInfo: flacMetadatablockOut.StreamInfo}
|
||
}
|
||
}
|
||
},
|
||
"dOps": func(_ *decodeContext, d *decode.D) {
|
||
d.FieldFormat("descriptor", opusPacketFrameFormat, nil)
|
||
},
|
||
"av1C": func(_ *decodeContext, d *decode.D) {
|
||
d.FieldFormat("descriptor", av1CCRFormat, nil)
|
||
},
|
||
"vpcC": func(_ *decodeContext, d *decode.D) {
|
||
d.FieldU8("version")
|
||
d.FieldU24("flags")
|
||
d.FieldFormat("descriptor", vpxCCRFormat, nil)
|
||
},
|
||
"esds": func(ctx *decodeContext, d *decode.D) {
|
||
d.FieldU32("version")
|
||
|
||
dv, v := d.FieldFormat("descriptor", mpegESFormat, nil)
|
||
mpegEsOut, ok := v.(format.MpegEsOut)
|
||
if dv != nil && !ok {
|
||
panic(fmt.Sprintf("expected mpegEsOut got %#+v", v))
|
||
}
|
||
|
||
if ctx.currentTrack != nil && len(mpegEsOut.DecoderConfigs) > 0 {
|
||
dc := mpegEsOut.DecoderConfigs[0]
|
||
ctx.currentTrack.objectType = dc.ObjectType
|
||
ctx.currentTrack.formatInArg = format.AACFrameIn{ObjectType: dc.ASCObjectType}
|
||
}
|
||
},
|
||
"stts": func(_ *decodeContext, d *decode.D) {
|
||
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++
|
||
})
|
||
},
|
||
"stsc": func(ctx *decodeContext, d *decode.D) {
|
||
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 ctx.currentTrack != nil {
|
||
ctx.currentTrack.stsc = append(ctx.currentTrack.stsc, stsc{
|
||
firstChunk: int(firstChunk),
|
||
samplesPerChunk: int(samplesPerChunk),
|
||
})
|
||
}
|
||
i++
|
||
})
|
||
},
|
||
"stsz": func(ctx *decodeContext, d *decode.D) {
|
||
d.FieldU8("version")
|
||
d.FieldU24("flags")
|
||
// TODO: bytes_per_sample from audio stsd?
|
||
sampleSize := d.FieldU32("sample_size")
|
||
entryCount := d.FieldU32("entry_count")
|
||
if sampleSize == 0 {
|
||
var i uint64
|
||
d.FieldArrayLoop("entries", func() bool { return i < entryCount }, func(d *decode.D) {
|
||
size := uint32(d.FieldU32("size"))
|
||
if ctx.currentTrack != nil {
|
||
ctx.currentTrack.stsz = append(ctx.currentTrack.stsz, stsz{
|
||
size: int64(size),
|
||
count: 1,
|
||
})
|
||
}
|
||
i++
|
||
})
|
||
} else {
|
||
if ctx.currentTrack != nil {
|
||
ctx.currentTrack.stsz = append(ctx.currentTrack.stsz, stsz{
|
||
size: int64(sampleSize),
|
||
count: int(entryCount),
|
||
})
|
||
}
|
||
}
|
||
},
|
||
"stco": func(ctx *decodeContext, d *decode.D) {
|
||
d.FieldU8("version")
|
||
d.FieldU24("flags")
|
||
entryCount := d.FieldU32("entry_count")
|
||
var i uint64
|
||
d.FieldArrayLoop("entries", func() bool { return i < entryCount }, func(d *decode.D) {
|
||
chunkOffset := d.FieldU32("chunk_offset")
|
||
if ctx.currentTrack != nil {
|
||
ctx.currentTrack.stco = append(ctx.currentTrack.stco, int64(chunkOffset))
|
||
}
|
||
i++
|
||
})
|
||
},
|
||
"stss": func(_ *decodeContext, d *decode.D) {
|
||
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")
|
||
}
|
||
})
|
||
},
|
||
"sdtp": func(_ *decodeContext, d *decode.D) {
|
||
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.UToSymStr{
|
||
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)
|
||
})
|
||
}
|
||
})
|
||
},
|
||
"ctts": func(_ *decodeContext, d *decode.D) {
|
||
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")
|
||
d.FieldS32("sample_offset")
|
||
i++
|
||
})
|
||
},
|
||
// TODO: refactor: merge with stco?
|
||
"co64": func(ctx *decodeContext, d *decode.D) {
|
||
d.FieldU8("version")
|
||
d.FieldU24("flags")
|
||
entryCount := d.FieldU32("entry_count")
|
||
var i uint64
|
||
d.FieldArrayLoop("entries", func() bool { return i < entryCount }, func(d *decode.D) {
|
||
offset := d.FieldU64("offset")
|
||
if ctx.currentTrack != nil {
|
||
ctx.currentTrack.stco = append(ctx.currentTrack.stco, int64(offset))
|
||
}
|
||
i++
|
||
})
|
||
},
|
||
"sidx": func(_ *decodeContext, d *decode.D) {
|
||
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++
|
||
})
|
||
},
|
||
"udta": decodeBoxes,
|
||
"meta": func(ctx *decodeContext, d *decode.D) {
|
||
// TODO: meta box sometimes has a 4 byte unknown field? (flag/version?)
|
||
maybeFlags := d.PeekBits(32)
|
||
if maybeFlags == 0 {
|
||
// TODO: rename?
|
||
d.FieldU32("maybe_flags")
|
||
}
|
||
decodeBoxes(ctx, d)
|
||
},
|
||
"ilst": decodeBoxes,
|
||
"_apple_list": decodeBoxes,
|
||
"_apple_entry": func(_ *decodeContext, d *decode.D) {
|
||
d.FieldU8("version")
|
||
d.FieldU24("flags")
|
||
d.FieldUTF8("data", int(d.BitsLeft()/8))
|
||
},
|
||
"data": func(ctx *decodeContext, d *decode.D) {
|
||
d.FieldU8("version")
|
||
d.FieldU24("flags")
|
||
d.FieldU32("reserved")
|
||
if isParent(ctx, "covr") {
|
||
dv, _, _ := d.TryFieldFormatLen("data", d.BitsLeft(), imageFormat, nil)
|
||
if dv == nil {
|
||
d.FieldRawLen("data", d.BitsLeft())
|
||
}
|
||
} else {
|
||
d.FieldUTF8("data", int(d.BitsLeft()/8))
|
||
}
|
||
},
|
||
"moov": decodeBoxes,
|
||
"moof": func(ctx *decodeContext, d *decode.D) {
|
||
ctx.currentMoofOffset = (d.Pos() / 8) - 8
|
||
decodeBoxes(ctx, d)
|
||
},
|
||
// Track Fragment
|
||
"traf": decodeBoxes,
|
||
// Movie Fragment Header
|
||
"mfhd": func(_ *decodeContext, d *decode.D) {
|
||
d.FieldU8("version")
|
||
d.FieldU24("flags")
|
||
d.FieldU32("sequence_number")
|
||
},
|
||
// Track Fragment Header
|
||
"tfhd": func(ctx *decodeContext, d *decode.D) {
|
||
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 := uint32(d.FieldU32("track_id"))
|
||
m := &moof{}
|
||
ctx.currentTrack = ctx.tracks[trackID]
|
||
if ctx.currentTrack != nil {
|
||
ctx.currentTrack.moofs = append(ctx.currentTrack.moofs, m)
|
||
ctx.currentTrack.currentMoof = m
|
||
}
|
||
|
||
if baseDataOffsetPresent {
|
||
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.FieldU32("default_sample_flags")
|
||
}
|
||
},
|
||
// Track Fragment Run
|
||
"trun": func(ctx *decodeContext, d *decode.D) {
|
||
m := &moof{}
|
||
if ctx.currentTrack != nil && ctx.currentTrack.currentMoof != nil {
|
||
m = ctx.currentTrack.currentMoof
|
||
}
|
||
m.offset = ctx.currentMoofOffset
|
||
|
||
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")
|
||
if dataOffsetPresent {
|
||
m.dataOffset = d.FieldS32("data_offset")
|
||
}
|
||
if firstSampleFlagsPresent {
|
||
d.FieldU32("first_sample_flags")
|
||
}
|
||
|
||
if sampleCount > maxSampleEntryCount {
|
||
d.Errorf("too many sample trun entries %d > %d", sampleCount, maxSampleEntryCount)
|
||
}
|
||
|
||
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.FieldU32("sample_flags")
|
||
}
|
||
if sampleCompositionTimeOffsetsPresent {
|
||
d.FieldU32("sample_composition_time_offset")
|
||
}
|
||
})
|
||
|
||
m.samplesSizes = append(m.samplesSizes, sampleSize)
|
||
}
|
||
})
|
||
},
|
||
"tfdt": func(_ *decodeContext, d *decode.D) {
|
||
version := d.FieldU8("version")
|
||
d.FieldU24("flags")
|
||
if version == 1 {
|
||
d.FieldU64("start_time")
|
||
} else {
|
||
d.FieldU32("start_time")
|
||
}
|
||
},
|
||
"mvex": decodeBoxes,
|
||
"trex": func(_ *decodeContext, d *decode.D) {
|
||
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.FieldU4("reserved0")
|
||
d.FieldU2("is_leading")
|
||
d.FieldU2("sample_depends_on")
|
||
d.FieldU2("sample_is_depended_on")
|
||
d.FieldU2("sample_has_redundancy")
|
||
d.FieldU3("sample_padding_value")
|
||
d.FieldU1("sample_is_non_sync_sample")
|
||
d.FieldU16("sample_degradation_priority")
|
||
},
|
||
"mfra": decodeBoxes,
|
||
"tfra": func(_ *decodeContext, d *decode.D) {
|
||
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)
|
||
})
|
||
}
|
||
})
|
||
},
|
||
"mfro": func(_ *decodeContext, d *decode.D) {
|
||
d.FieldU8("version")
|
||
d.FieldU24("flags")
|
||
d.FieldU32("mfra_size")
|
||
},
|
||
// TODO: item location
|
||
// HEIC image
|
||
"iloc": func(_ *decodeContext, d *decode.D) {
|
||
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)
|
||
})
|
||
}
|
||
})
|
||
})
|
||
}
|
||
})
|
||
},
|
||
"infe": func(_ *decodeContext, d *decode.D) {
|
||
d.FieldU8("version")
|
||
d.FieldU24("flags")
|
||
d.FieldU16("id")
|
||
d.FieldU16("protection_index")
|
||
d.FieldUTF8Null("item_name")
|
||
// TODO: really optional? seems so
|
||
if d.NotEnd() {
|
||
d.FieldUTF8Null("content_type")
|
||
}
|
||
if d.NotEnd() {
|
||
d.FieldUTF8Null("content_encoding")
|
||
}
|
||
},
|
||
"iinf": func(ctx *decodeContext, d *decode.D) {
|
||
d.FieldU8("version")
|
||
d.FieldU24("flags")
|
||
_ = d.FieldU16("entry_count")
|
||
decodeBoxes(ctx, d)
|
||
},
|
||
"iprp": decodeBoxes,
|
||
"ipco": decodeBoxes,
|
||
"ID32": func(_ *decodeContext, d *decode.D) {
|
||
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", id3v2Format, nil)
|
||
},
|
||
"mehd": func(_ *decodeContext, d *decode.D) {
|
||
d.FieldU8("version")
|
||
flags := d.FieldU24("flags")
|
||
if flags&0b1 != 0 {
|
||
d.FieldU64("fragment_duration")
|
||
} else {
|
||
d.FieldU32("fragment_duration")
|
||
}
|
||
},
|
||
"pssh": func(_ *decodeContext, d *decode.D) {
|
||
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}
|
||
)
|
||
systemIDNames := scalar.BytesToScalar{
|
||
{Bytes: systemIDCommon[:], Scalar: scalar.S{Sym: "Common"}},
|
||
{Bytes: systemIDWidevine[:], Scalar: scalar.S{Sym: "Widevine"}},
|
||
{Bytes: systemIDPlayReady[:], Scalar: scalar.S{Sym: "PlayReady"}},
|
||
}
|
||
|
||
version := d.FieldU8("version")
|
||
d.FieldU24("flags")
|
||
systemIDBB := d.FieldRawLen("system_id", 6*8, systemIDNames)
|
||
// TODO: make nicer
|
||
systemID, err := systemIDBB.Bytes()
|
||
if err != nil {
|
||
d.IOPanic(err, "systemIDBB.Bytes")
|
||
}
|
||
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, protoBufWidevineFormat, nil)
|
||
case bytes.Equal(systemID, systemIDPlayReady[:]):
|
||
d.FieldFormatLen("data", int64(dataLen)*8, psshPlayreadyFormat, nil)
|
||
case systemID == nil:
|
||
fallthrough
|
||
default:
|
||
d.FieldRawLen("data", int64(dataLen)*8)
|
||
}
|
||
},
|
||
"sinf": decodeBoxes,
|
||
"frma": func(ctx *decodeContext, d *decode.D) {
|
||
format := d.FieldUTF8("format", 4)
|
||
|
||
// set to original data format
|
||
// TODO: how to handle multiple descriptors? track current?
|
||
if ctx.currentTrack != nil && len(ctx.currentTrack.sampleDescriptions) > 0 {
|
||
ctx.currentTrack.sampleDescriptions[0].originalFormat = format
|
||
}
|
||
},
|
||
"schm": func(_ *decodeContext, d *decode.D) {
|
||
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)
|
||
}
|
||
},
|
||
"schi": decodeBoxes,
|
||
"btrt": func(_ *decodeContext, d *decode.D) {
|
||
d.FieldU32("decoding_buffer_size")
|
||
d.FieldU32("max_bitrate")
|
||
d.FieldU32("avg_bitrate")
|
||
},
|
||
"pasp": func(_ *decodeContext, d *decode.D) {
|
||
d.FieldU32("h_spacing")
|
||
d.FieldU32("v_spacing")
|
||
},
|
||
"uuid": func(_ *decodeContext, d *decode.D) {
|
||
d.FieldRawLen("uuid", 16*8, scalar.RawUUID, uuidNames)
|
||
d.FieldRawLen("data", d.BitsLeft())
|
||
},
|
||
"keys": func(_ *decodeContext, d *decode.D) {
|
||
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")
|
||
d.FieldUTF8("key_namespace", 4)
|
||
d.FieldUTF8("key_name", int(keySize)-8)
|
||
})
|
||
}
|
||
})
|
||
},
|
||
"wave": decodeBoxes,
|
||
"saiz": func(_ *decodeContext, d *decode.D) {
|
||
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")
|
||
}
|
||
})
|
||
}
|
||
},
|
||
"sgpd": func(_ *decodeContext, d *decode.D) {
|
||
version := d.FieldU8("version")
|
||
d.FieldU24("flags")
|
||
d.FieldU32("grouping_type")
|
||
var defaultLength uint64
|
||
if version == 1 {
|
||
defaultLength = d.FieldU32("default_length")
|
||
}
|
||
if version >= 2 {
|
||
d.FieldU32("default_sample_description_index")
|
||
}
|
||
entryCount := d.FieldU32("entry_count")
|
||
d.FieldArray("entries", func(d *decode.D) {
|
||
for i := uint64(0); i < entryCount; i++ {
|
||
entryLen := defaultLength
|
||
if version == 1 {
|
||
if defaultLength == 0 {
|
||
entryLen = d.FieldU32("description_length")
|
||
} else if entryLen == 0 {
|
||
d.Fatalf("sgpd groups entry len <= 0 version 1")
|
||
}
|
||
} else if entryLen == 0 {
|
||
d.Fatalf("sgpd groups entry len <= 0")
|
||
}
|
||
d.FieldRawLen("data", int64(entryLen)*8)
|
||
}
|
||
})
|
||
},
|
||
"sbgp": func(_ *decodeContext, d *decode.D) {
|
||
version := d.FieldU8("version")
|
||
d.FieldU24("flags")
|
||
|
||
d.FieldU32("grouping_type")
|
||
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")
|
||
})
|
||
}
|
||
})
|
||
},
|
||
"saio": func(_ *decodeContext, d *decode.D) {
|
||
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")
|
||
}
|
||
}
|
||
})
|
||
},
|
||
"senc": func(_ *decodeContext, d *decode.D) {
|
||
d.FieldU8("version")
|
||
d.FieldU24("flags")
|
||
|
||
d.FieldU32("sample_count")
|
||
// TODO need iv size here
|
||
},
|
||
"tenc": func(_ *decodeContext, d *decode.D) {
|
||
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 {
|
||
d.FieldU8("default_constant_iv_size")
|
||
}
|
||
},
|
||
"covr": decodeBoxes,
|
||
"dec3": func(_ *decodeContext, d *decode.D) {
|
||
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")
|
||
}
|
||
}
|
||
},
|
||
"dac4": func(_ *decodeContext, d *decode.D) {
|
||
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.FieldUFn("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())
|
||
}
|
||
},
|
||
"tapt": decodeBoxes,
|
||
"clef": func(_ *decodeContext, d *decode.D) {
|
||
d.FieldU8("version")
|
||
d.FieldU24("flags")
|
||
d.FieldFP32("width")
|
||
d.FieldFP32("height")
|
||
},
|
||
"prof": func(_ *decodeContext, d *decode.D) {
|
||
d.FieldU8("version")
|
||
d.FieldU24("flags")
|
||
d.FieldFP32("width")
|
||
d.FieldFP32("height")
|
||
},
|
||
"enof": func(_ *decodeContext, d *decode.D) {
|
||
d.FieldU8("version")
|
||
d.FieldU24("flags")
|
||
d.FieldFP32("width")
|
||
d.FieldFP32("height")
|
||
},
|
||
"clap": func(_ *decodeContext, d *decode.D) {
|
||
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")
|
||
},
|
||
"smhd": func(_ *decodeContext, d *decode.D) {
|
||
d.FieldU8("version")
|
||
d.FieldU24("flags")
|
||
d.FieldFP16("balance")
|
||
d.FieldU16("reserved")
|
||
},
|
||
}
|
||
}
|