Support Buffersizes other than 1024, read more

This adds support for buffersizes <= 1024. It comes with a few gotchas:

- To keep the arrays on the stack there is always a size of 1024
allocated on the stack, but only the parts for the buffer are used
- Sizes bigger than 1024 are not currently supported

src/main.rs

@@ -19,7 +19,7 @@ TODO:
     - [ ] f32.mul_add() or f32.to_bits() / f32.from_bits()
     - [ ] only calculate connected ports https://docs.rs/jack/0.7.1/jack/struct.Port.html#method.connected_count
     - [ ] Flag volume modulations as dirty
-- [ ] Support other Buffers than 1024
+- [x] Support other Buffers than 1024
 - [ ]  Features:
     - [ ] Flags to control printing (--quiet etc)
     - [ ] Option to set initial values
@@ -126,6 +126,8 @@ fn main() {
               .unwrap(); 
         16];
 
+    let buffersize = client.buffer_size() as usize;
+    
     // Is called asynchronously. Moves/mixes the actual audio samples from A to be
     let process_callback = move |_: &jack::Client, ps: &jack::ProcessScope| -> jack::Control {
         // For every output get a sum of corresponding inputs
@@ -141,9 +143,11 @@ fn main() {
 
                 // Sum each input to output buffer
                 output_buffers.iter_mut()
+                              .take(buffersize)
                               .enumerate()
                               .for_each(|(output_index, b)| {
                                 b.iter_mut()
+                                 .take(buffersize)
                                  .enumerate()
                                  .for_each(|(sample_index, sample)| {
                                     // For each input get the corrsponding atomic value for the volume control