package parser

type mjpegParser struct {
  inputBuffer []byte
  isParsing bool
  parserOutputChanRef chan []byte
  userOutputChanRef chan []byte
  inputChan chan byte
}

func NewMJPEGParser(inputChanLen int) (p *mjpegParser){
  p = new(mjpegParser)
  p.isParsing = true
  p.inputChan = make(chan byte, inputChanLen )
  return
}

func (p *mjpegParser)Stop(){
  p.isParsing = false
}

func (p *mjpegParser)Start(){
  go p.parse()
}

func (p *mjpegParser)GetInputChan() chan byte {
  return p.inputChan
}

func (p *mjpegParser)GetOutputChan() chan []byte {
  return p.userOutputChanRef
}

func (p *mjpegParser)SetOutputChan(aChan chan []byte){
  p.parserOutputChanRef = aChan
  p.userOutputChanRef = aChan
}

func (p *mjpegParser)parse() {
  var outputBuffer []byte
	for p.isParsing {
    aByte := <-p.inputChan
		outputBuffer = append(outputBuffer, aByte)
    if aByte == 0xFF && len(outputBuffer) != 0 {
      aByte := <-p.inputChan
      outputBuffer = append(outputBuffer, aByte)
      if aByte == 0xD8 {
        p.parserOutputChanRef<-outputBuffer[:len(outputBuffer)-2]
        outputBuffer = outputBuffer[len(outputBuffer)-2:]
      }
    }
  }
}