package tm import ( "bytes" "errors" "github.com/umlock-music/cli/algo/common" ) 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 { file []byte audio []byte headerMatch bool audioExt string } func (d *Decoder) GetCoverImage() []byte { return nil } func (d *Decoder) GetAudioData() []byte { return d.audio } func (d *Decoder) GetAudioExt() string { return d.audioExt } func (d *Decoder) GetMeta() common.Meta { return nil } func NewDecoder(data []byte) *Decoder { return &Decoder{file: data} } func (d *Decoder) Validate() error { if len(d.file) < 8 { return errors.New("invalid file size") } if !bytes.Equal(magicHeader, d.file[:4]) { return errors.New("not a valid tm file") } d.headerMatch = true return nil } func (d *Decoder) Decode() error { d.audio = d.file if d.headerMatch { for i := 0; i < 8; i++ { d.audio[i] = replaceHeader[i] } d.audioExt = "m4a" } return nil }