parsed upto the beginning of the playlist
This commit is contained in:
lordwelch
parent
c338840e4d
commit
534b11210a
271
main.go
271
main.go
@ -7,8 +7,10 @@ import (
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"io"
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"io/ioutil"
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"os"
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"path/filepath"
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)
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// User Operation mask table
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const (
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ChapterSearchMask = 1 << iota
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TimeSearchMask
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@ -37,13 +39,20 @@ const (
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SelectMenuLanguageMask
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)
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// Playlist Flags
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const (
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PlaylistRandomAccess = 1 << iota
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AudioMixApp
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LosslessMayBypassMixer
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// reserved
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reserved
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)
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const (
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IsDifferentAudios = 1 << (iota + 7)
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IsSeamlessAngleChange
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)
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// MPLS is a struct representing an MPLS file
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type MPLS struct {
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Header string
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playlistStart int
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@ -53,51 +62,40 @@ type MPLS struct {
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Playlist Playlist
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}
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// AppInfoPlaylist sucks
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type AppInfoPlaylist struct {
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Len int
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PlaybackType int
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PlaybackCount int
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UOMask uint64
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AppInfoPlaylistFlags uint16
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Len int
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PlaybackType int
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PlaybackCount int
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UOMask uint64
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PlaylistFlags uint16
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}
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// Playlist sucks
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type Playlist struct {
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len int
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NumberOfPlayItems uint16
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numberOfSubpaths uint16
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PlayItems PlayItem
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len int
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playItemCount uint16
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subPathCount uint16
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playItems []PlayItem
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}
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// reserved = 1 << (iota + 7)
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const (
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IsDifferentAudios = 1 << (iota + 7)
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IsSeamlessAngleChange
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)
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// PlayItem contains information about a an item in the playlist
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type PlayItem struct {
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len uint16
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ClipFile string
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ClipID string // M2TS
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// Reserved 11 bits
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IsMultiAngle bool // (1 bit)
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ConnectionCondition byte // (4 bits)
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STCID byte
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InTime uint16
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OutTime uint16
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UOMask uint64
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RandomAccessFlag byte // 1 bit - 7 reserved
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StillMode byte
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stillTime uint16
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angleCount byte
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AngleFlag byte
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len uint16
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clpi CLPI
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flags uint16 // multiangle/connection condition
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inTime int32
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outTime int32
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UOMask uint64
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RandomAccessFlag byte
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stillMode byte
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stillTime uint16
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angleCount byte
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angleFlags byte
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angles []CLPI
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}
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// CLPI contains the filename and the codec ID
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type CLPI struct {
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ClipFile string
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ClipID string // M2TS
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@ -105,20 +103,34 @@ type CLPI struct {
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}
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func main() {
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parse(os.Args[1])
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Mpls, err := Parse(os.Args[1])
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fmt.Println(Mpls)
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panic(err)
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}
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func parse(filename string) error {
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// Parse parses an MPLS file into an MPLS struct
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func Parse(filename string) (Mpls MPLS, err error) {
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var (
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buf [10]byte
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n int
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n64 int64
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Mpls MPLS
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file *bytes.Reader
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f []byte
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)
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f, err := ioutil.ReadFile(filename)
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f, err = ioutil.ReadFile(filepath.Clean(filename))
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if err != nil {
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return err
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return MPLS{}, err
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}
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file := bytes.NewReader(f)
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file = bytes.NewReader(f)
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err = Mpls.Parse(file)
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return Mpls, err
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}
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// Parse reads MPLS data from an io.ReadSeeker
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func (Mpls *MPLS) Parse(file io.ReadSeeker) error {
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var (
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buf [10]byte
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n int
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err error
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)
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n, err = file.Read(buf[:8])
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if err != nil || n != 8 {
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@ -126,7 +138,7 @@ func parse(filename string) error {
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}
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str := string(buf[:8])
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if str[:4] != "MPLS" {
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return fmt.Errorf("%s is not an mpls file it must start with 'MPLS' it started with '%s'", filename, str[:4])
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return fmt.Errorf("not an mpls file it must start with 'MPLS' it started with '%s'", str[:4])
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}
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if str[4:8] != "0200" {
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fmt.Fprintf(os.Stderr, "warning: mpls may not work it is version %s\n", str[4:8])
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@ -135,72 +147,142 @@ func parse(filename string) error {
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Mpls.Header = str
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Mpls.playlistStart, err = readInt32(file, buf[:4])
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fmt.Println("int:", Mpls.playlistStart, "binary:", buf[:4])
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if err != nil {
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return err
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}
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fmt.Println("uint:", Mpls.playlistStart, "binary:", buf[:4])
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Mpls.playlistMarkStart, err = readInt32(file, buf[:4])
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if err != nil {
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return err
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}
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fmt.Println("uint:", Mpls.playlistMarkStart, "binary:", buf[:4])
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Mpls.extensionDataStart, err = readInt32(file, buf[:4])
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if err != nil {
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return err
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}
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fmt.Println("uint:", Mpls.extensionDataStart, "binary:", buf[:4])
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n64, err = file.Seek(20, io.SeekCurrent)
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if err != nil || n64 != 20 {
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return err
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}
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Mpls.AppInfoPlaylist.Len, err = readInt32(file, buf[:4])
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if err != nil {
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return err
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}
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fmt.Println("uint:", Mpls.AppInfoPlaylist.Len, "binary:", buf[:4])
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n, err = file.Read(buf[:4])
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if err != nil || n != 1 {
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Mpls.playlistMarkStart, err = readInt32(file, buf[:4])
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fmt.Println("int:", Mpls.playlistMarkStart, "binary:", buf[:4])
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if err != nil {
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return err
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}
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Mpls.AppInfoPlaylist.PlaybackType = int(buf[1])
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switch Mpls.AppInfoPlaylist.PlaybackType {
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case 2, 3:
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Mpls.AppInfoPlaylist.PlaybackCount = int(binary.BigEndian.Uint16(buf[3:4]))
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fmt.Println("uint:", Mpls.AppInfoPlaylist.PlaybackCount, "binary:", buf[3:4])
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}
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Mpls.AppInfoPlaylist.UOMask, err = readUInt64(file, buf[:8])
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if err != nil || n != 1 {
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Mpls.extensionDataStart, err = readInt32(file, buf[:4])
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fmt.Println("int:", Mpls.extensionDataStart, "binary:", buf[:4])
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if err != nil {
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return err
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}
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Mpls.AppInfoPlaylist.AppInfoPlaylistFlags, err = readUInt16(file, buf[:2])
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if err != nil || n != 1 {
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_, err = file.Seek(20, io.SeekCurrent)
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if err != nil {
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return err
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}
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err = Mpls.Playlist.parsePlaylist(file, int64(Mpls.playlistStart))
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err = Mpls.AppInfoPlaylist.parse(file)
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if err != nil {
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return err
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}
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_, err = file.Seek(int64(Mpls.playlistStart), io.SeekStart)
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if err != nil {
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return err
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}
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err = Mpls.Playlist.Parse(file)
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if err != nil {
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return err
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}
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return nil
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}
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func (p Playlist) parsePlaylist(file io.ReadSeeker, PlaylistStart int64) error {
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// Parse reads AppInfoPlaylist data from an io.ReadSeeker
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func (aip *AppInfoPlaylist) parse(file io.ReadSeeker) error {
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var (
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n64 int64
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err error
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buf [10]byte
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err error
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n int
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)
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n64, err = file.Seek(PlaylistStart, io.SeekStart)
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if err != nil || n64 != 20 {
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return err
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}
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fmt.Println("uint:", PlaylistStart, "binary:", buf[:4])
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p.len, err = readInt32(file, buf[:4])
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aip.Len, err = readInt32(file, buf[:4])
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fmt.Println("int:", aip.Len, "binary:", buf[:4])
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if err != nil {
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return err
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}
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file.Read(buf[:5])
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n, err = file.Read(buf[:4])
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if err != nil || n != 4 {
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return err
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}
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aip.PlaybackType = int(buf[1])
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fmt.Println("int:", aip.PlaybackType, "binary:", buf[1])
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aip.PlaybackCount = int(binary.BigEndian.Uint16(buf[2:4]))
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fmt.Println("int:", aip.PlaybackCount, "binary:", buf[2:4])
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aip.UOMask, err = readUInt64(file, buf[:8])
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fmt.Println("int:", aip.UOMask, "binary:", buf[:8])
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if err != nil || n != 1 {
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return err
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}
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aip.PlaylistFlags, err = readUInt16(file, buf[:2])
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fmt.Println("int:", aip.PlaylistFlags, "binary:", buf[:2])
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if err != nil || n != 1 {
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return err
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}
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return nil
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}
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// Parse reads Playlist data from an io.ReadSeeker
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func (p *Playlist) Parse(file io.ReadSeeker) error {
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var (
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buf [10]byte
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err error
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)
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p.len, err = readInt32(file, buf[:])
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fmt.Println("int:", p.len, "binary:", buf[:4])
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if err != nil {
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return err
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}
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_, err = file.Seek(2, io.SeekCurrent)
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if err != nil {
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return err
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}
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p.playItemCount, err = readUInt16(file, buf[:])
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fmt.Println("int:", p.playItemCount, "binary:", buf[:2])
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if err != nil {
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return err
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}
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p.subPathCount, err = readUInt16(file, buf[:])
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fmt.Println("int:", p.subPathCount, "binary:", buf[:2])
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if err != nil {
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return err
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}
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for i := 0; i < int(p.playItemCount); i++ {
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var item PlayItem
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err = item.Parse(file)
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if err != nil {
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return err
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}
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p.playItems = append(p.playItems, item)
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}
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return nil
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}
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// Parse reads PlayItem data from an io.ReadSeeker
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func (pi *PlayItem) Parse(file io.Reader) error {
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var (
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buf [10]byte
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n int
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err error
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)
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pi.len, err = readUInt16(file, buf[:])
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fmt.Println("int:", pi.len, "binary:", buf[:2])
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if err != nil {
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return err
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}
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n, err = file.Read(buf[:9])
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if err != nil || n != 9 {
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return err
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}
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str := string(buf[:9])
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if str[5:9] != "M2TS" {
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fmt.Fprintf(os.Stderr, "warning: this playlist may be faulty it has a play item that is '%s' not 'M2TS'", str[4:8])
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}
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pi.clpi.file = str[:5]
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pi.clpi.Codec = str[5:9]
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return nil
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}
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@ -213,11 +295,16 @@ func readUInt16(file io.Reader, buf []byte) (uint16, error) {
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}
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func readInt32(file io.Reader, buf []byte) (int, error) {
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n, err := readUInt32(file, buf)
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return int(n), err
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}
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func readUInt32(file io.Reader, buf []byte) (uint32, error) {
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n, err := file.Read(buf[:4])
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if err != nil || n != 4 {
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return 0, err
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}
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return int(binary.BigEndian.Uint32(buf[:4])), nil
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return binary.BigEndian.Uint32(buf[:4]), nil
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}
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func readUInt64(file io.Reader, buf []byte) (uint64, error) {
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