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unlock-music-cli/algo/tm/tm.go

51 lines
1.1 KiB
Go

package tm
import (
"bytes"
"errors"
"fmt"
"io"
"github.com/unlock-music/cli/algo/common"
)
4 years ago
var replaceHeader = []byte{0x00, 0x00, 0x00, 0x20, 0x66, 0x74, 0x79, 0x70}
var magicHeader = []byte{0x51, 0x51, 0x4D, 0x55} //0x15, 0x1D, 0x1A, 0x21
type Decoder struct {
raw io.ReadSeeker
offset int
audio io.Reader
}
func (d *Decoder) Validate() error {
header := make([]byte, 8)
if _, err := io.ReadFull(d.raw, header); err != nil {
return fmt.Errorf("tm read header: %w", err)
}
if !bytes.Equal(magicHeader, header[:len(magicHeader)]) {
return errors.New("tm: valid magic header")
}
d.audio = io.MultiReader(bytes.NewReader(replaceHeader), d.raw)
return nil
}
func (d *Decoder) Read(buf []byte) (int, error) {
return d.audio.Read(buf)
}
func NewTmDecoder(rd io.ReadSeeker) common.Decoder {
return &Decoder{raw: rd}
}
func init() {
// QQ Music IOS M4a
common.RegisterDecoder("tm2", false, NewTmDecoder)
common.RegisterDecoder("tm6", false, NewTmDecoder)
// QQ Music IOS Mp3
common.RegisterDecoder("tm0", false, common.NewRawDecoder)
common.RegisterDecoder("tm3", false, common.NewRawDecoder)
}