func (rsc *Mp3ReaderSeekerCloser) Read(p []byte) (int, error) {
var bytesRead C.size_t
buffer := (*C.uchar)(unsafe.Pointer(&p[0]))
bufferSize := (C.size_t)(len(p))
err := mpg123Error(C.mpg123_read(rsc.handle, buffer, bufferSize, &bytesRead))
if err != nil {
return int(bytesRead), err
}
return int(bytesRead), nil
}
// Read data from stream and decode into buf. Returns number of bytes decoded.
func (d *Decoder) Read(buf []byte) (int, error) {
var done C.size_t
err := C.mpg123_read(d.handle, (*C.uchar)(&buf[0]), C.size_t(len(buf)), &done)
if err == C.MPG123_DONE {
return int(done), EOF
}
if err != C.MPG123_OK {
return int(done), fmt.Errorf("mpg123 error: %s", d.strerror())
}
return int(done), nil
}
func DecodeTrack(file string, control chan int) {
var v1 *C.mpg123_id3v1
var v2 *C.mpg123_id3v2
m := C.mpg123_new(nil, nil)
defer C.mpg123_delete(m)
f := C.CString(file)
if err := C.mpg123_open(m, f); err != C.MPG123_OK {
panic("Error reading file")
}
defer C.mpg123_close(m)
C.mpg123_scan(m)
meta := C.mpg123_meta_check(m)
if meta == C.MPG123_ID3 && C.mpg123_id3(m, &v1, &v2) == C.MPG123_OK {
var title, artist, album, genre string
switch false {
case v2 == nil:
fmt.Println("ID3V2 tag found")
title = C.GoString(v2.title.p)
artist = C.GoString(v2.artist.p)
album = C.GoString(v2.album.p)
genre = C.GoString(v2.genre.p)
case v1 == nil:
fmt.Println("ID3V2 tag found")
title = C.GoString(&v1.title[0])
artist = C.GoString(&v1.artist[0])
album = C.GoString(&v1.album[0])
genre = "Unknown" // FIXME convert int to string
}
fmt.Println(title)
fmt.Println(artist)
fmt.Println(album)
fmt.Println(genre)
}
default_driver := C.ao_default_driver_id()
var format C.ao_sample_format
var device *C.ao_device
var channels, encoding C.int
var rate C.long
C.mpg123_getformat(m, &rate, &channels, &encoding)
format.bits = 16
format.channels = channels
format.rate = C.int(rate)
format.byte_format = C.AO_FMT_LITTLE
device = C.ao_open_live(default_driver, &format, nil)
if device == nil {
panic("Error opening device")
return
}
defer C.ao_close(device)
var ret C.int
var fill C.size_t
buf := make([]C.uchar, 1024*16)
for {
ret = C.mpg123_read(m, (*C.uchar)(unsafe.Pointer(&buf)), 16*1024, &fill)
if ret == C.MPG123_DONE {
control <- 1
break
}
C.ao_play(device, (*C.char)(unsafe.Pointer(&buf)), 16*1024)
}
}