func (stream *Stream) init() error {
// need to allocate this first so that it can be closed on error
stream.Frames = make(chan *Frame)
if stream.avstream == nil {
close(stream.Frames)
return errors.New("nil avstream")
}
if stream.cdcctx != nil {
stream.freeCodecContext()
}
stream.cdcctx = stream.avstream.codec
if decoder := C.avcodec_find_decoder(stream.cdcctx.codec_id); decoder == nil || C.avcodec_open2(stream.cdcctx, decoder, nil) < 0 {
stream.cdcctx = nil
close(stream.Frames)
return errors.New("Cannot find decoder for " + C.GoString(C.avcodec_get_name(stream.cdcctx.codec_id)))
}
stream.packets = make(chan *C.AVPacket)
stream.frame = &Frame{}
switch stream.avstream.codec.codec_type {
case C.AVMEDIA_TYPE_AUDIO:
stream.decodeF = avcodec_decode_audio
case C.AVMEDIA_TYPE_VIDEO:
stream.decodeF = avcodec_decode_video
default:
stream.freeCodecContext()
close(stream.Frames)
return errors.New("unsupported codec")
}
return nil
}
//Get the name of a codec.
func AvcodecGetName(d CodecId) string {
return C.GoString(C.avcodec_get_name((C.enum_AVCodecID)(d)))
}