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zeptocorebinary.go
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/
zeptocorebinary.go
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package zeptocore
import (
"encoding/binary"
"math"
"os"
"strings"
log "github.com/schollz/logger"
)
type SampleInfo struct {
Size uint32
Bpm uint16 // 0-511
PlayMode uint16 // 0-7
OneShot uint16 // 0-1 (off/on)
TempoMatch uint16 // 0-1 (off/on)
Oversampling uint16 // 0-1 (1x or 2x)
NumChannels uint16 // 0-1 (mono or stereo)
Version uint16 // 0-127
SpliceTrigger uint16
SpliceVariable uint16 // 0-1 (off/on)
SliceNum uint8 // 0-255
SliceStart []int32
SliceStop []int32
SliceType []int8
}
type SampleInfoPack struct {
Size uint32
Flags uint32 // Holds bpm, slice_num, slice_current, play_mode, one_shot, tempo_match, oversampling, and num_channels
SpliceInfo uint16 // Holds splice_trigger and splice_variable
SliceNum uint8 // 0-255
SliceStart []int32
SliceStop []int32
SliceType []int8
}
func SampleInfoMarshal(si *SampleInfo) *SampleInfoPack {
// constrain variables
if si.Bpm > 510 {
si.Bpm = 510
}
if si.PlayMode > 7 {
si.PlayMode = 7
}
if si.OneShot > 1 {
si.OneShot = 1
}
if si.TempoMatch > 1 {
si.TempoMatch = 1
}
if si.Oversampling > 1 {
si.Oversampling = 1
}
if si.NumChannels > 1 {
si.NumChannels = 1
}
if si.SpliceTrigger > 255 {
si.SpliceTrigger = 255
}
if si.SpliceVariable > 1 {
si.SpliceVariable = 1
}
if si.SliceNum > 255 {
si.SliceNum = 255
}
pack := &SampleInfoPack{
Size: si.Size,
Flags: uint32(si.Bpm) | (uint32(si.PlayMode) << 9) | (uint32(si.OneShot) << 12) | (uint32(si.TempoMatch) << 13) | (uint32(si.Oversampling) << 14) | (uint32(si.NumChannels) << 15) | (uint32(si.Version) << 16),
SpliceInfo: si.SpliceTrigger | (si.SpliceVariable << 15),
SliceNum: si.SliceNum,
SliceStart: make([]int32, len(si.SliceStart)),
SliceStop: make([]int32, len(si.SliceStop)),
SliceType: make([]int8, len(si.SliceType)),
}
copy(pack.SliceStart, si.SliceStart)
copy(pack.SliceStop, si.SliceStop)
copy(pack.SliceType, si.SliceType)
return pack
}
func (sip *SampleInfoPack) WriteToFile(filename string) error {
file, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return err
}
defer file.Close()
err = binary.Write(file, binary.LittleEndian, sip.Size)
if err != nil {
return err
}
err = binary.Write(file, binary.LittleEndian, sip.Flags)
if err != nil {
return err
}
err = binary.Write(file, binary.LittleEndian, sip.SpliceInfo)
if err != nil {
return err
}
err = binary.Write(file, binary.LittleEndian, sip.SliceNum)
if err != nil {
return err
}
for _, v := range sip.SliceStart {
err = binary.Write(file, binary.LittleEndian, v)
if err != nil {
return err
}
}
for _, v := range sip.SliceStop {
err = binary.Write(file, binary.LittleEndian, v)
if err != nil {
return err
}
}
for _, v := range sip.SliceType {
err = binary.Write(file, binary.LittleEndian, v)
if err != nil {
return err
}
}
return nil
}
func (f File) updateInfo(fnameIn string) (err error) {
// determine the size
finfo, err := os.Stat(fnameIn)
if err != nil {
log.Error(err)
return
}
totalSamples := float64(finfo.Size()-44) / float64(f.Channels+1) / 2
totalSamples = totalSamples - 22050*2*float64(f.Oversampling)
fsize := totalSamples * float64(f.Channels+1) * 2 // total size excluding padding = totalSamples channels x 2 bytes
sliceNum := len(f.SliceStart)
if sliceNum == 0 {
f.SliceStart = []float64{0.0}
f.SliceStop = []float64{1.0}
f.SliceType = []int{0}
sliceNum = 1
}
BPMTempoMatch := uint8(0)
if f.TempoMatch {
BPMTempoMatch = 1
}
oneshot := 0
if f.OneShot {
oneshot = 1
}
splicevariable := 0
if f.SpliceVariable {
splicevariable = 1
}
sampleinfo := &SampleInfo{
Size: uint32(fsize),
Bpm: uint16(f.BPM),
PlayMode: uint16(f.SplicePlayback),
OneShot: uint16(oneshot),
TempoMatch: uint16(BPMTempoMatch),
Oversampling: uint16(f.Oversampling - 1),
NumChannels: uint16(f.Channels),
Version: 0,
SpliceTrigger: uint16(f.SpliceTrigger),
SpliceVariable: uint16(splicevariable),
SliceNum: uint8(sliceNum),
SliceStart: []int32{},
SliceStop: []int32{},
SliceType: []int8{},
}
for i, _ := range f.SliceStart {
sampleinfo.SliceStart = append(sampleinfo.SliceStart, int32(math.Round(f.SliceStart[i]*fsize))/4*4)
sampleinfo.SliceStop = append(sampleinfo.SliceStop, int32(math.Round(f.SliceStop[i]*fsize))/4*4)
sampleinfo.SliceType = append(sampleinfo.SliceType, int8(f.SliceType[i]))
}
if strings.HasSuffix(fnameIn, "0.wav") {
log.Debugf("writing sample info %s to %+v", fnameIn, sampleinfo)
}
sampleinfoPack := SampleInfoMarshal(sampleinfo)
err = sampleinfoPack.WriteToFile(fnameIn + ".info")
return
}