/
ModRipper.go
250 lines (226 loc) · 5.35 KB
/
ModRipper.go
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package main
import (
"bufio"
"bytes"
"encoding/binary"
"flag"
"fmt"
"io"
"log"
"os"
"strings"
)
const (
chunksize = 1024
zerostring = string(0x00)
//wav file header
channelCode = "0100"
chunkDataSize = "10000000"
compressionCode = "0100"
sampleRate = "7A460000"
averageBPS = "F48C0000"
blockAlign = "0200"
bitsPerSample = "1000"
)
func bufferFromFile(name string) (buffer *bytes.Buffer) {
data, err := os.Open(name)
if err != nil {
log.Fatal(err)
}
defer data.Close()
reader := bufio.NewReader(data)
buffer = bytes.NewBuffer(make([]byte, 0))
part := make([]byte, chunksize)
for {
count, err := reader.Read(part)
if err != nil {
break
}
buffer.Write(part[:count])
}
if err == io.EOF {
err = nil
}
return
}
type Sample struct {
Title string
Length int
Data []byte
}
type WavFile struct {
Filename string
Header *bytes.Buffer
FormatHeader *bytes.Buffer
Data *bytes.Buffer
}
func NewWavFile() (wav *WavFile) {
wav = &WavFile{
Header: bytes.NewBuffer(make([]byte, 0)),
FormatHeader: bytes.NewBuffer(make([]byte, 0)),
Data: bytes.NewBuffer(make([]byte, 0)),
}
//prepare header
wav.Header.WriteString("RIFF")
//prepare format header
wav.FormatHeader.WriteString("fmt " +
chunkDataSize +
compressionCode +
channelCode +
sampleRate +
averageBPS +
blockAlign +
bitsPerSample)
//prepare data header
wav.Data.WriteString("data")
return
}
func (w *WavFile) Construct(s Sample) {
w.Filename = s.Title
w.Data.Write(bytesFromInt(len(s.Data)))
for _, byt := range s.Data {
w.Data.WriteByte(byt)
}
w.Header.Write(bytesFromInt(len(s.Data) + w.FormatHeader.Len() + 8))
w.Header.WriteString("WAVE")
}
func (w *WavFile) Dump() (err error) {
dump, err := os.OpenFile(w.Filename+".wav", os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return
}
defer dump.Close()
_, err = dump.Write(w.Header.Bytes())
if err != nil {
return
}
_, err = dump.Write(w.FormatHeader.Bytes())
if err != nil {
return
}
_, err = dump.Write(w.Data.Bytes())
return
}
func bytesFromInt(n int) (data []byte) {
data = make([]byte, 4)
binary.LittleEndian.PutUint32(data[:], uint32(n))
return
}
func biggest(b []byte) (x byte) {
for _, y := range b {
if y > x {
x = y
}
}
return x
}
func BigEndianBytesToInt(b []byte) uint16 {
var ret uint16
buf := bytes.NewBuffer(b)
err := binary.Read(buf, binary.BigEndian, &ret)
if err != nil {
return 0
}
return ret
}
func LittleEndianBytesToInt(b []byte) uint16 {
var ret uint16
buf := bytes.NewBuffer(b)
err := binary.Read(buf, binary.LittleEndian, &ret)
if err != nil {
return 0
}
return ret
}
func ProtrackerParse(rawData *bytes.Buffer) (samples []Sample) {
modTitle := string(bytes.Trim(rawData.Next(20), zerostring))
for i := 0; i < 31; i++ {
sampleTitle := modTitle + " - " + string(bytes.Trim(rawData.Next(22), zerostring))
sampleLength := BigEndianBytesToInt(rawData.Next(2)) * 2
if sampleLength >= uint16(2) &&
len(sampleTitle) > 0 {
samples = append(samples, Sample{
Title: sampleTitle,
Length: int(sampleLength),
})
}
//discard finetune (1 byte), volume (1 byte), repeat info (4 bytes)
_ = rawData.Next(6)
}
songLength := rawData.Next(2)[0] //discard unused 127 byte.
patternOrder := rawData.Next(133)[:songLength]
// discard pattern data
for i := 0; i < int(biggest(patternOrder))+1; i++ { // patterns start at 00, so add 1
_ = rawData.Next(1024)
}
for i, s := range samples {
samples[i].Data = rawData.Next(s.Length)
}
fmt.Println("Title:", modTitle, "Samples:", len(samples))
return
}
func FastTrackerParse(rawData *bytes.Buffer) (samples []Sample) {
header := string(rawData.Next(17))
fmt.Println(header)
if header != "Extended Module: " {
return nil
}
xmTitle := string(bytes.Trim(rawData.Next(20), " "))
fmt.Println(xmTitle)
_ = rawData.Next(1 + //ID=01Ah
20 + //Tracker name
2 + //Tracker revision number, hi-byte is major version
4 + //Header size
2 + //Song length in patterns
2 + //Restart position
2) //Number of channels
p := rawData.Next(2)
fmt.Println(p)
q := rawData.Next(2)
fmt.Println(q)
numberOfPatterns := LittleEndianBytesToInt(p)
numberOfInstruments := LittleEndianBytesToInt(q)
_ = rawData.Next(2 + //Flags
2 + //Default tempo
2 + //Default BPM
256) // Pattern order table
for i := uint16(0); i < numberOfPatterns; i++ {
_ = rawData.Next(7)
patternDataLength := LittleEndianBytesToInt(rawData.Next(2))
_ = rawData.Next(int(patternDataLength))
}
_ = rawData.Next(4)
fmt.Println(xmTitle, numberOfPatterns, numberOfInstruments, string(rawData.Next(20)))
return nil
}
func main() {
flag.Parse()
if len(flag.Args()) == 0 {
panic("Need some files.. ")
}
for _, f := range flag.Args() {
rawData := bufferFromFile(f)
dotSlice := strings.Split(f, ".")
extensionString := strings.ToLower(dotSlice[len(dotSlice)-1])
fmt.Println(extensionString)
var samples []Sample
if extensionString == "mod" {
samples = ProtrackerParse(rawData)
} else if extensionString == "xm" {
fmt.Println("xm OK")
samples = FastTrackerParse(rawData)
} else {
fmt.Println("Unsupported extension:", extensionString)
}
for _, s := range samples {
wav := NewWavFile()
wav.Construct(s)
err := wav.Dump()
if err != nil {
fmt.Println("Error:", s.Title, err)
} else {
fmt.Println("Wrote wav:", wav.Filename)
}
}
}
}