// Gen generates a buffer using a routine.
// A runtime panic will occur if routine is not one of the
// BufferRoutine constants.
func (self *Buffer) Gen(routine string, flags int, args ...float32) error {
if err := checkBufferRoutine(routine); err != nil {
return err
}
if err := checkBufferGenFlags(flags); err != nil {
return err
}
pat := bufferGenAddress
gen, err := osc.NewMessage(pat)
if err != nil {
return err
}
if err := gen.WriteInt32(self.Num); err != nil {
return err
}
if err := gen.WriteString(routine); err != nil {
return err
}
if err := gen.WriteInt32(int32(flags)); err != nil {
return err
}
for _, arg := range args {
if err := gen.WriteFloat32(arg); err != nil {
return err
}
}
if err := self.client.oscConn.Send(gen); err != nil {
return err
}
var done *osc.Message
select {
case done = <-self.client.doneChan:
case err = <-self.client.oscErrChan:
return err
}
if done.CountArguments() != 2 {
return errors.New("expected two arguments to /done message")
}
_, err = done.ReadString()
if err != nil {
return err
}
bufnum, err := done.ReadInt32()
if err != nil {
return err
}
// TODO:
// Don't error if we get a done message for a different buffer.
// We should probably requeue this particular done message on doneChan.
if bufnum != self.Num {
m := "expected done message for buffer %d, but got one for buffer %d"
return fmt.Errorf(m, self.Num, bufnum)
}
return nil
}
// parseGroup parses information about a group from a message
// received at /g_queryTree
// it *does not* recursively query for child groups
func parseGroup(msg *osc.Message) (*Group, error) {
// return an error if msg.Address is not right
if msg.Address() != gQueryTreeReply {
return nil, fmt.Errorf("msg.Address should be %s, got %s", gQueryTreeReply, msg.Address())
}
// g_queryTree replies should have at least 3 arguments
g, numArgs := new(Group), msg.CountArguments()
if numArgs < 3 {
return nil, fmt.Errorf("expected 3 arguments for message, got %d", numArgs)
}
// get the id of the group this reply is for
nodeID, err := msg.ReadInt32()
if err != nil {
return nil, err
}
g.Node.id = nodeID
// initialize the children array
numChildren, err := msg.ReadInt32()
if err != nil {
return nil, err
}
if numChildren < 0 {
return nil, fmt.Errorf("expected numChildren >= 0, got %d", numChildren)
}
g.children = make([]*Node, numChildren)
// get the childrens' ids
var numControls, numSubChildren int32
for i := 3; i < numArgs; {
nodeID, err = msg.ReadInt32()
if err != nil {
return nil, err
}
g.children[i-3] = &Node{nodeID}
// get the number of children of this node
// if -1 this is a synth, if >= 0 this is a group
numSubChildren, err = msg.ReadInt32()
if err != nil {
return nil, err
}
if numSubChildren == -1 {
// synth
i += 3
numControls, err = msg.ReadInt32()
if err != nil {
return nil, err
}
i += 1 + int(numControls*2)
} else if numSubChildren >= 0 {
// group
i += 2
}
}
return g, nil
}
// AllocBuffer allocates a buffer on the server
func (self *Client) AllocBuffer(frames, channels int) (*Buffer, error) {
buf := newBuffer(self)
pat := bufferAllocAddress
alloc, err := osc.NewMessage(pat)
if err != nil {
return nil, err
}
if err := alloc.WriteInt32(buf.Num); err != nil {
return nil, err
}
if err := alloc.WriteInt32(int32(frames)); err != nil {
return nil, err
}
if err := alloc.WriteInt32(int32(channels)); err != nil {
return nil, err
}
if err := self.oscConn.Send(alloc); err != nil {
return nil, err
}
var done *osc.Message
select {
case done = <-self.doneChan:
break
case err = <-self.oscErrChan:
return nil, err
}
// error if this message was not an ack of the synthdef
if done.CountArguments() != 2 {
return nil, fmt.Errorf("expected two arguments to /done message")
}
addr, err := done.ReadString()
if err != nil {
return nil, err
}
if addr != pat {
return nil, fmt.Errorf("expected first argument to be %s but got %s", pat, addr)
}
bufnum, err := done.ReadInt32()
if err != nil {
return nil, err
}
// TODO:
// Don't error if we get a done message for a different buffer.
// We should probably requeue this particular done message on doneChan.
if bufnum != buf.Num {
m := "expected done message for buffer %d, but got one for buffer %d"
return nil, fmt.Errorf(m, buf.Num, bufnum)
}
return buf, nil
}
// ReadBuffer tells the server to read an audio file and
// load it into a buffer
func (self *Client) ReadBuffer(path string, num int32) (*Buffer, error) {
allocRead, err := osc.NewMessage(bufferReadAddress)
if err != nil {
return nil, err
}
buf := newReadBuffer(path, num, self)
if err := allocRead.WriteInt32(buf.Num); err != nil {
return nil, err
}
if err := allocRead.WriteString(path); err != nil {
return nil, err
}
if err := self.oscConn.Send(allocRead); err != nil {
return nil, err
}
var done *osc.Message
select {
case done = <-self.doneChan:
case err = <-self.oscErrChan:
return nil, err
}
// error if this message was not an ack of the buffer read
if done.CountArguments() != 2 {
return nil, fmt.Errorf("expected two arguments to /done message")
}
addr, err := done.ReadString()
if err != nil {
return nil, err
}
if addr != bufferReadAddress {
return nil, fmt.Errorf("expected first argument to be %s but got %s", bufferReadAddress, addr)
}
bufnum, err := done.ReadInt32()
if err != nil {
return nil, err
}
// TODO:
// Don't error if we get a done message for a different buffer.
// We should probably requeue this particular done message on doneChan.
if bufnum != buf.Num {
m := "expected done message for buffer %d, but got one for buffer %d"
return nil, fmt.Errorf(m, buf.Num, bufnum)
}
return buf, nil
}