package flv

import (
	"io"
	"os"
)

type FLVWriter struct {
	W io.Writer
	curr_offset int
}

func NewFLVWriter(stream_dir string) (*FLVWriter, error) {
	writer := new(FLVWriter)
	base_dir, _ := os.UserHomeDir()
	filepipe, err := os.Create(base_dir + "/live/" + stream_dir + "/stream.flv")
	if err != nil {
		return nil, err
	}
	writer.W = filepipe
	if err = writer.write_flv_header(); err != nil {
		return nil, err
	}
	return writer, nil
}

func (writer *FLVWriter) Close() (error) {
	return writer.W.(*os.File).Close()
}

func (writer *FLVWriter) write_flv_header() (err error) {
	header := make([]byte, 13)
	copy(header[:3], "FLV")
	header[3] = 1
	header[4] = 5
	header[8] = 9
	
	n, err := writer.W.Write(header)
	writer.curr_offset += n
	return
}