func (i *identification) ReadFrom(r *ogg.BitReader) error {
if r.Read8(8) != headerTypeIdentification {
return ogg.ErrCorruptStream
}
if r.Read64(48) != pattern {
return ogg.ErrCorruptStream
}
if r.Read32(32) != 0 {
return ogg.ErrCorruptStream
}
i.audioChannels = r.Read8(8)
i.audioSampleRate = r.Read32(32)
i.bitrateMaximum = r.Read32(32)
i.bitrateNominal = r.Read32(32)
i.bitrateMinimum = r.Read32(32)
i.blocksize0 = uint16(1) << r.Read8(4)
i.blocksize1 = uint16(1) << r.Read8(4)
if !r.ReadBool() {
return ogg.ErrCorruptStream
}
return nil
}
func (s *setup) ReadFrom(r *ogg.BitReader) error {
if r.Read8(8) != headerTypeSetup {
return ogg.ErrCorruptStream
}
if r.Read64(48) != pattern {
return ogg.ErrCorruptStream
}
// CODEBOOKS
s.codebooks = make([]codebook, r.Read16(8)+1)
for i := range s.codebooks {
err := s.codebooks[i].ReadFrom(r)
if err != nil {
return err
}
}
// TIME DOMAIN TRANSFORMS
transformCount := r.Read8(6) + 1
for i := 0; i < int(transformCount); i++ {
if r.Read16(16) != 0 {
return ogg.ErrCorruptStream
}
}
// FLOORS
s.floors = make([]floor, r.Read8(6)+1)
for i := range s.floors {
var err error
switch r.Read16(16) {
case 0:
// TODO
// floor0 is not supported right now, also I haven't found any files that use it.
/*var f floor0
err = f.ReadFrom(r)
s.floors[i] = &f*/
case 1:
f := new(floor1)
err = f.ReadFrom(r)
s.floors[i] = f
default:
err = ogg.ErrCorruptStream
}
if err != nil {
return err
}
}
// RESIDUES
s.residues = make([]residue, r.Read8(6)+1)
for i := range s.residues {
err := s.residues[i].ReadFrom(r)
if err != nil {
return err
}
}
// MAPPINGS
s.mappings = make([]mapping, r.Read8(6)+1)
for i := range s.mappings {
m := &s.mappings[i]
if r.Read16(16) != 0 {
return ogg.ErrCorruptStream
}
if r.ReadBool() {
m.submaps = make([]mappingSubmap, r.Read8(4)+1)
} else {
m.submaps = make([]mappingSubmap, 1)
}
if r.ReadBool() {
m.couplingSteps = r.Read16(8) + 1
m.magnitude = make([]uint8, m.couplingSteps)
m.angle = make([]uint8, m.couplingSteps)
for i := range m.magnitude {
m.magnitude[i] = r.Read8(ilog(s.channels - 1))
m.angle[i] = r.Read8(ilog(s.channels - 1))
}
}
if r.Read8(2) != 0 {
return ogg.ErrCorruptStream
}
m.mux = make([]uint8, s.channels)
if len(m.submaps) > 1 {
for i := range m.mux {
m.mux[i] = r.Read8(4)
}
}
for i := range m.submaps {
r.Read8(8)
m.submaps[i].floor = r.Read8(8)
m.submaps[i].residue = r.Read8(8)
}
}
// MODES
s.modes = make([]mode, r.Read8(6)+1)
for i := range s.modes {
m := &s.modes[i]
m.blockflag = r.Read8(1)
if r.Read16(16) != 0 {
return ogg.ErrCorruptStream
}
if r.Read16(16) != 0 {
return ogg.ErrCorruptStream
}
m.mapping = r.Read8(8)
}
if !r.ReadBool() {
return ogg.ErrCorruptStream
}
return nil
}