package main

import (
	"bufio"
	"fmt"
	"io"
	"log"
	"os"

	"git.netflux.io/rob/avframes/pkg/mpeg"
)

const fname = "/home/rob/share/home-office/example.mp3"

func main() {
	f, err := os.Open(fname)
	if err != nil {
		log.Fatal(err)
	}

	bufreader := bufio.NewReader(f)
	buf := make([]byte, 4)

	var i int
	for {
		_, err := io.ReadFull(bufreader, buf)
		if err != nil {
			if err == io.EOF {
				break
			}
			log.Fatal(err)
		}

		if h := mpeg.Header(buf); h.IsValid() {
			fmt.Printf("Got header: %v, audio version: %d, layer index: %d, bitrate: %d, samplerate: %d, samplesPerFrame: %d, padding: %d, size: %d\n", h, h.AudioVersionId(), h.Layer(), h.BitRate(), h.SampleRate(), h.SamplesPerFrame(), h.PaddingBytes(), h.Len())
			bufreader.Discard(h.Len() - 4)
		} else {
			fmt.Println("Discarding a byte")
			bufreader.Discard(3)
		}
		i++
	}
}