fix: add missing packed(4) for asio time structs (#1041)

Author: iftach-cogntiv

CHANGELOG.md

@@ -10,6 +10,7 @@
 - ALSA: Update `alsa` to 0.10.
 - ALSA(process_output): Pass `silent=true` to `PCM.try_recover`, so it doesn't write to stderr.
 - ASIO: Fix linker flags for MinGW cross-compilation.
+- ASIO: Add packed(4) to representation of ASIO time structs in bindings.
 - CI: Added native ARM64 Linux support in GitHub Actions.
 - CI: Fix cargo publish to trigger on GitHub releases instead of every master commit.
 - CI: Replace cargo install commands with cached tool installation for faster builds.

asio-sys/src/bindings/mod.rs

@@ -161,7 +161,7 @@ pub enum AsioSampleType {
 /// Gives information about buffers
 /// Receives pointers to buffers
 #[derive(Debug, Copy, Clone)]
-#[repr(C)]
+#[repr(C, packed(4))]
 pub struct AsioBufferInfo {
     /// 0 for output 1 for input
     pub is_input: c_long,
@@ -172,7 +172,7 @@ pub struct AsioBufferInfo {
 }
 
 /// Callbacks that ASIO calls
-#[repr(C)]
+#[repr(C, packed(4))]
 struct AsioCallbacks {
     buffer_switch: extern "C" fn(double_buffer_index: c_long, direct_process: c_long) -> (),
     sample_rate_did_change: extern "C" fn(s_rate: c_double) -> (),
@@ -244,7 +244,7 @@ pub enum AsioMessageSelectors {
 }
 
 /// A rust-usable version of the `ASIOTime` type that does not contain a binary blob for fields.
-#[repr(C)]
+#[repr(C, packed(4))]
 pub struct AsioTime {
     /// Must be `0`.
     pub reserved: [c_long; 4],
@@ -256,7 +256,7 @@ pub struct AsioTime {
 
 /// A rust-compatible version of the `ASIOTimeInfo` type that does not contain a binary blob for
 /// fields.
-#[repr(C)]
+#[repr(C, packed(4))]
 pub struct AsioTimeInfo {
     /// Absolute speed (1. = nominal).
     pub speed: c_double,
@@ -276,7 +276,7 @@ pub struct AsioTimeInfo {
 
 /// A rust-compatible version of the `ASIOTimeCode` type that does not use a binary blob for its
 /// fields.
-#[repr(C)]
+#[repr(C, packed(4))]
 pub struct AsioTimeCode {
     /// Speed relation (fraction of nominal speed) optional.
     ///