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ReadHeader() -> Streams()

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This commit is contained in:
nareix 2016-06-30 22:55:31 +08:00
parent fd62ece67d
commit 4a10a9ef1b
1 changed files with 11 additions and 4 deletions
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15
demuxer.go
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@ -20,8 +20,7 @@ type Demuxer struct {
}
func (self *Demuxer) Streams() (streams []av.CodecData, err error) {
if len(self.streams) == 0 {
err = fmt.Errorf("mp4: no streams")
if err = self.probe(); err != nil {
return
}
for _, stream := range self.streams {
@ -30,7 +29,11 @@ func (self *Demuxer) Streams() (streams []av.CodecData, err error) {
return
}
func (self *Demuxer) ReadHeader() (err error) {
func (self *Demuxer) probe() (err error) {
if self.movieAtom != nil {
return
}
var N int64
var moov *atom.Movie
@ -65,7 +68,6 @@ func (self *Demuxer) ReadHeader() (err error) {
err = fmt.Errorf("'moov' atom not found")
return
}
self.movieAtom = moov
self.streams = []*Stream{}
for i, atrack := range moov.Tracks {
@ -101,6 +103,7 @@ func (self *Demuxer) ReadHeader() (err error) {
}
}
self.movieAtom = moov
return
}
@ -300,6 +303,10 @@ func (self *Stream) sampleCount() int {
}
func (self *Demuxer) ReadPacket() (pkt av.Packet, err error) {
if err = self.probe(); err != nil {
return
}
var chosen *Stream
var chosenidx int
for i, stream := range self.streams {