decoder.go

package drum

import (
	"bytes"
	"encoding/binary"
	//	"math"
	//	"encoding/hex"
	"fmt"
	"io/ioutil"
	//	"reflect"
)

// DecodeFile decodes the drum machine file found at the provided path
// and returns a pointer to a parsed pattern which is the entry point to the
// rest of the data.
// TODO: implement
func DecodeFile(path string) (*Pattern, error) {
	p := &Pattern{}
	var bit []byte

	file, err := ioutil.ReadFile(path)
	if err != nil {
		fmt.Println("sorry there was an error reading the file")
	}
	buf := bytes.NewReader(file)
	err = binary.Read(buf, binary.BigEndian, &bit)
	if err != nil {
		fmt.Println("There was binary reading", err)
	}
	fmt.Println("Printer has", p)
	fmt.Println("Bit has", bit)
	headline := string(file[:6])
	version := string(file[14:25])
	bpm := binary.BigEndian.Uint32(file[45:50])
	fmt.Println(headline, version, bpm)
	for i := 0; i < 211; i += 25 {
		test := binary.BigEndian.Uint16(file[(51 + i):(54 + i)])

		namelength := int(file[54+i])

		drum := string(file[(55 + i):(55 + i + namelength)])
		i += namelength - 4
		var beatStart int
		beatStart = i + 55 + int(namelength)
		var beats [16]int
		for j := 0; j < (16); j++ {
			beats[j] = int(file[beatStart+j])
		}

		fmt.Println(test, drum, "namelength:", namelength, beats)
	}

	return p, nil
}

// Pattern is the high level representation of the
// drum pattern contained in a .splice file.
// TODO: implement
type Pattern struct {
}