pkt->pos = avio_tell(s->pb);
pkt->duration = enc->block_align == 38 ? 160 : 240;
if ((ret = avio_read(s->pb, pkt->data, enc->block_align)) != enc->block_align) {
pkt->pos = avio_tell(s->pb);
pkt->duration = enc->block_align == 38 ? 160 : 240;
if ((ret = avio_read(s->pb, pkt->data, enc->block_align)) != enc->block_align) {