func (a *app) OnInit() {
var err error
a.r, err = os.Open(*in)
if err != nil {
log.Fatalf("Unable to open file '%s': %s", *in, err)
}
var wm webm.WebM
a.reader, err = webm.Parse(a.r, &wm)
if err != nil {
log.Fatal("Unable to parse file: ", err)
}
a.duration = wm.GetDuration()
var vtrack *webm.TrackEntry
if !*justaudio {
vtrack = wm.FindFirstVideoTrack()
}
var vstream *webm.Stream
if vtrack != nil {
vstream = webm.NewStream(vtrack)
a.fduration = vtrack.GetDefaultDuration()
a.vchan = vstream.VideoChannel()
}
var atrack *webm.TrackEntry
if !*justvideo {
atrack = wm.FindFirstAudioTrack()
}
var astream *webm.Stream
if atrack != nil {
astream = webm.NewStream(atrack)
}
splitter := webm.NewSplitter(a.reader.Chan)
splitter.Split(astream, vstream)
a.steps = uint(0xffffffff)
if a.vchan != nil {
a.img = <-a.vchan
a.pimg = a.img
}
if atrack != nil {
channels := int(atrack.Audio.Channels)
a.aw = &AudioWriter{ch: astream.AudioChannel(),
channels: channels, active: true}
chk(portaudio.Initialize())
a.pastream, err = portaudio.OpenDefaultStream(0, channels,
atrack.Audio.SamplingFrequency, 0, a.aw.processAudio)
chk(err)
chk(a.pastream.Start())
}
}
