Add stubs for host side audio ports extension

src/wine-host/bridges/clap-impls/host-proxy.cpp

@@ -43,13 +43,24 @@ clap_host_proxy::clap_host_proxy(ClapBridge& bridge,
           .request_restart = host_request_restart,
           .request_process = host_request_process,
           .request_callback = host_request_callback,
+      }),
+      ext_audio_ports_vtable(clap_host_audio_ports_t{
+          .is_rescan_flag_supported = ext_audio_ports_is_rescan_flag_supported,
+          .rescan = ext_audio_ports_rescan,
       }) {}
 
 const void* CLAP_ABI
 clap_host_proxy::host_get_extension(const struct clap_host* host,
                                     const char* extension_id) {
-    // TODO: Implement
-    return nullptr;
+    assert(host && host->host_data && extension_id);
+    auto self = static_cast<const clap_host_proxy*>(host->host_data);
+
+    if (self->supported_extensions_.supports_audio_ports &&
+        strcmp(extension_id, CLAP_EXT_AUDIO_PORTS) == 0) {
+        return &self->ext_audio_ports_vtable;
+    } else {
+        return nullptr;
+    }
 }
 
 void CLAP_ABI
@@ -100,3 +111,21 @@ clap_host_proxy::host_request_callback(const struct clap_host* host) {
             });
     }
 }
+
+bool CLAP_ABI clap_host_proxy::ext_audio_ports_is_rescan_flag_supported(
+    const clap_host_t* host,
+    uint32_t flag) {
+    assert(host && host->host_data);
+    auto self = static_cast<clap_host_proxy*>(host->host_data);
+
+    // TODO: Implement
+    return false;
+}
+
+void CLAP_ABI clap_host_proxy::ext_audio_ports_rescan(const clap_host_t* host,
+                                                      uint32_t flags) {
+    assert(host && host->host_data);
+    auto self = static_cast<clap_host_proxy*>(host->host_data);
+
+    // TODO: Implement
+}

src/wine-host/bridges/clap-impls/host-proxy.h

@@ -18,6 +18,7 @@
 
 #include <atomic>
 
+#include <clap/ext/audio-ports.h>
 #include <clap/host.h>
 
 #include "../../common/serialization/clap/plugin-factory.h"
@@ -62,6 +63,12 @@ class clap_host_proxy {
     static void CLAP_ABI host_request_process(const struct clap_host* host);
     static void CLAP_ABI host_request_callback(const struct clap_host* host);
 
+    static bool CLAP_ABI
+    ext_audio_ports_is_rescan_flag_supported(const clap_host_t* host,
+                                             uint32_t flag);
+    static void CLAP_ABI ext_audio_ports_rescan(const clap_host_t* host,
+                                                uint32_t flags);
+
     /**
      * The extensions supported by the host, set just before calling
      * `clap_plugin::init()` on the bridged plugin. We'll allow the plugin to
@@ -81,6 +88,11 @@ class clap_host_proxy {
      */
     const clap_host_t host_vtable_;
 
+    // Extensions also have vtables. Whether or not we expose these to the host
+    // depends on whether the plugin supported this extension when the host
+    // called `clap_plugin::init()`.
+    const clap_host_audio_ports ext_audio_ports_vtable;
+
     /**
      * Keeps track of whether there are pending host callbacks. Used to prevent
      * calling `clap_plugin::on_main_thread()` multiple times in a row when the