Fix remaining compile errors for ASIO host

Now runs the beep and enumerate examples nicely! Time to do a proper
code review of the ASIO stuff and see how to best take advantage of the
new `Host` API.

src/host/asio/device.rs

@@ -5,6 +5,7 @@ pub type SupportedOutputFormats = std::vec::IntoIter<SupportedFormat>;
 use std::hash::{Hash, Hasher};
 use DefaultFormatError;
 use DeviceNameError;
+use DevicesError;
 use Format;
 use SampleFormat;
 use SampleRate;

src/host/asio/mod.rs

@@ -7,13 +7,14 @@ use {
     DeviceNameError,
     DevicesError,
     EventLoop as EventLoopTrait,
+    Format,
     Host as HostTrait,
     PauseStreamError,
     PlayStreamError,
     StreamDataResult,
     StreamId as StreamIdTrait,
     SupportedFormatsError,
-}
+};
 
 pub use self::device::{Device, Devices, SupportedInputFormats, SupportedOutputFormats, default_input_device, default_output_device};
 pub use self::stream::{EventLoop, StreamId};
@@ -28,8 +29,8 @@ pub struct Host;
 
 impl Host {
     pub fn new() -> Result<Self, crate::HostUnavailable> {
-        unimplemented!("asio as an initialisation and termination process that needs to be impld");
-        //Ok(Host)
+        //unimplemented!("asio as an initialisation and termination process that needs to be impld");
+        Ok(Host)
     }
 }
 
@@ -39,7 +40,8 @@ impl HostTrait for Host {
     type EventLoop = EventLoop;
 
     fn is_available() -> bool {
-        unimplemented!("check how to do this using asio-sys")
+        true
+        //unimplemented!("check how to do this using asio-sys")
     }
 
     fn devices(&self) -> Result<Self::Devices, DevicesError> {

src/host/asio/stream.rs

@@ -679,10 +679,6 @@ impl EventLoop {
                     ) => {
                         let mut my_buffers = $Buffers;
                         {
-                            // Wrap the cpal buffer
-                            let buff = OutputBuffer {
-                                buffer: &mut my_buffers.cpal,
-                            };
                             // call the callback to fill the buffer with
                             // users data
                             callback(
@@ -894,6 +890,7 @@ impl EventLoop {
         }
         // Calling play when already playing is a no-op
         sys::play();
+        Ok(())
     }
 
     /// Pause the cpal stream for the given ID.
@@ -912,6 +909,7 @@ impl EventLoop {
         if any_playing {
             sys::stop();
         }
+        Ok(())
     }
 
     /// Destroy the cpal stream based on the ID.

src/platform/mod.rs

@@ -269,6 +269,7 @@ macro_rules! impl_platform_host {
                                 .map(StreamId)
                         }
                     )*
+                    _ => panic!("tried to build a stream with a device from another host"),
                 }
             }
 
@@ -285,6 +286,7 @@ macro_rules! impl_platform_host {
                                 .map(StreamId)
                         }
                     )*
+                    _ => panic!("tried to build a stream with a device from another host"),
                 }
             }
 
@@ -295,6 +297,7 @@ macro_rules! impl_platform_host {
                             e.play_stream(s.clone())
                         }
                     )*
+                    _ => panic!("tried to play a stream with an ID associated with another host"),
                 }
             }
 
@@ -305,6 +308,7 @@ macro_rules! impl_platform_host {
                             e.pause_stream(s.clone())
                         }
                     )*
+                    _ => panic!("tried to pause a stream with an ID associated with another host"),
                 }
             }
 
@@ -315,6 +319,7 @@ macro_rules! impl_platform_host {
                             e.destroy_stream(s.clone())
                         }
                     )*
+                    _ => panic!("tried to destroy a stream with an ID associated with another host"),
                 }
             }