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player.go
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/
player.go
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package audio
import (
"bytes"
"errors"
"io"
"io/ioutil"
"log"
"net/http"
"net/url"
"os"
"github.com/bobertlo/go-mpg123/mpg123"
)
type Player struct {
Writer *Writer
}
func NewPlayer() *Player {
return &Player{}
}
func (p *Player) LoadMP3Reader(r io.Reader) (*Writer, error) {
tmpfile, err := ioutil.TempFile("", "dueros-mp3")
if err != nil {
return nil, err
}
defer os.Remove(tmpfile.Name())
defer tmpfile.Close()
n, err := io.Copy(tmpfile, r)
if err != nil {
return nil, err
}
log.Printf("save %d bytes to %s", n, tmpfile.Name())
return p.loadMP3File(tmpfile.Name())
}
func (p *Player) LoadMP3(uri string) (*Writer, error) {
u, err := url.Parse(uri)
if err != nil {
return nil, err
}
switch u.Scheme {
case "http", "https":
resp, err := http.Get(uri)
if err != nil {
return nil, err
}
defer resp.Body.Close()
return p.LoadMP3Reader(resp.Body)
case "", "file":
return p.loadMP3File(u.Path)
}
return nil, errors.New("bad uri: " + uri)
}
func (p *Player) LoadAndPlay(uri string) error {
w, err := p.LoadMP3(uri)
if err != nil {
return err
}
defer w.Close()
return w.Play()
}
func (p *Player) loadMP3File(file string) (*Writer, error) {
d, err := mpg123.NewDecoder("")
if err != nil {
return nil, err
}
defer d.Close()
err = d.Open(file)
if err != nil {
return nil, err
}
rate, channels, encoding := d.GetFormat()
log.Printf("rate:%d, channel:%d, encoding:%d", rate, channels, encoding)
buf := new(bytes.Buffer)
io.Copy(buf, d)
return NewWriter(int(rate), channels, buf.Bytes())
}