package riff

import (
    "errors"
    "io"
    "sync"
    "time"
)

var (
    RiffID = [4]byte{'R', 'I', 'F', 'F'}
    FmtID  = [4]byte{'f', 'm', 't', ' '}
    junkID      = [4]byte{'J', 'U', 'N', 'K'}
    WavFormatID = [4]byte{'W', 'A', 'V', 'E'}
    DataFormatID = [4]byte{'d', 'a', 't', 'a'}
    rmiFormatID  = [4]byte{'R', 'M', 'I', 'D'}
    aviFormatID  = [4]byte{'A', 'V', 'I', ' '}
    ErrFmtNotSupported = errors.New("format not supported")
    ErrUnexpectedData = errors.New("unexpected data content")
)

func New(r io.Reader) *Parser {
    return &Parser{r: r, Wg: &sync.WaitGroup{}}
}

func Duration(r io.Reader) (time.Duration, error) {
    c := New(r)
    if err := c.ParseHeaders(); err != nil {
        return 0, err
    }
    return c.Duration()
}