feat(ximalaya): initial support
Unlock Music Dev
2 years ago
parent
110a78433a
commit
81862b26c9
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package ximalaya
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import (
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_ "embed"
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"encoding/binary"
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)
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const x2mHeaderSize = 1024
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var x2mKey = [...]byte{'x', 'm', 'l', 'y'}
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var x2mScrambleTable = [x2mHeaderSize]uint16{}
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//go:embed x2m_scramble_table.bin
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var x2mScrambleTableBytes []byte
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func init() {
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if len(x2mScrambleTableBytes) != 2*x2mHeaderSize {
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panic("invalid x3m scramble table")
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}
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for i := range x3mScrambleTable {
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x3mScrambleTable[i] = binary.LittleEndian.Uint16(x2mScrambleTableBytes[i*2:])
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}
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}
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// decryptX2MHeader decrypts the header of ximalaya .x2m file.
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// make sure input src is 1024(x2mHeaderSize) bytes long.
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func decryptX2MHeader(src []byte) []byte {
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dst := make([]byte, len(src))
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for dstIdx := range src {
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srcIdx := x2mScrambleTable[dstIdx]
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dst[dstIdx] = src[srcIdx] ^ x2mKey[dstIdx%len(x2mKey)]
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}
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return dst
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}
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package ximalaya
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import (
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_ "embed"
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"encoding/binary"
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)
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var x3mKey = [...]byte{
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'3', '9', '8', '9', 'd', '1', '1', '1',
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'a', 'a', 'd', '5', '6', '1', '3', '9',
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'4', '0', 'f', '4', 'f', 'c', '4', '4',
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'b', '6', '3', '9', 'b', '2', '9', '2',
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}
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const x3mHeaderSize = 1024
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var x3mScrambleTable = [x3mHeaderSize]uint16{}
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//go:embed x3m_scramble_table.bin
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var x3mScrambleTableBytes []byte
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func init() {
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if len(x3mScrambleTableBytes) != 2*x3mHeaderSize {
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panic("invalid x3m scramble table")
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}
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for i := range x3mScrambleTable {
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x3mScrambleTable[i] = binary.LittleEndian.Uint16(x3mScrambleTableBytes[i*2:])
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}
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}
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// decryptX3MHeader decrypts the header of ximalaya .x3m file.
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// make sure input src is 1024 (x3mHeaderSize) bytes long.
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func decryptX3MHeader(src []byte) []byte {
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dst := make([]byte, len(src))
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for dstIdx := range src {
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srcIdx := x3mScrambleTable[dstIdx]
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dst[dstIdx] = src[srcIdx] ^ x3mKey[dstIdx%len(x3mKey)]
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}
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return dst
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}
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package ximalaya
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import (
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"bytes"
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"fmt"
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"io"
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"unlock-music.dev/cli/algo/common"
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)
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type Decoder struct {
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rd io.ReadSeeker
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offset int
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audio io.Reader
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}
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func NewDecoder(rd io.ReadSeeker) common.Decoder {
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return &Decoder{rd: rd}
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}
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func (d *Decoder) Validate() error {
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encryptedHeader := make([]byte, x2mHeaderSize)
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if _, err := io.ReadFull(d.rd, encryptedHeader); err != nil {
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return fmt.Errorf("ximalaya read header: %w", err)
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}
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{ // try to decode with x2m
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header := decryptX2MHeader(encryptedHeader)
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if _, ok := common.SniffAll(header); ok {
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d.audio = io.MultiReader(bytes.NewReader(header), d.rd)
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return nil
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}
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}
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{ // try to decode with x3m
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// not read file again, since x2m and x3m have the same header size
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header := decryptX3MHeader(encryptedHeader)
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if _, ok := common.SniffAll(header); ok {
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d.audio = io.MultiReader(bytes.NewReader(header), d.rd)
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return nil
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}
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}
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return fmt.Errorf("ximalaya: unknown format")
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}
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func (d *Decoder) Read(p []byte) (n int, err error) {
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return d.audio.Read(p)
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}
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func init() {
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common.RegisterDecoder("x2m", false, NewDecoder)
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common.RegisterDecoder("x3m", false, NewDecoder)
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common.RegisterDecoder("xm", false, NewDecoder)
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}
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