Implement the CLAP latency extension

src/common/serialization/clap.h

@@ -23,6 +23,7 @@
 #include "../bitsery/ext/message-reference.h"
 #include "../utils.h"
 #include "clap/ext/audio-ports.h"
+#include "clap/ext/latency.h"
 #include "clap/ext/note-ports.h"
 #include "clap/ext/params.h"
 #include "clap/ext/tail.h"
@@ -53,6 +54,7 @@ using ClapMainThreadControlRequest =
                  clap::plugin::Deactivate,
                  clap::ext::audio_ports::plugin::Count,
                  clap::ext::audio_ports::plugin::Get,
+                 clap::ext::latency::plugin::Get,
                  clap::ext::note_ports::plugin::Count,
                  clap::ext::note_ports::plugin::Get,
                  clap::ext::params::plugin::Count,
@@ -147,6 +149,7 @@ using ClapMainThreadCallbackRequest =
     std::variant<WantsConfiguration,
                  clap::host::RequestRestart,
                  clap::host::RequestProcess,
+                 clap::ext::latency::host::Changed,
                  clap::ext::audio_ports::host::IsRescanFlagSupported,
                  clap::ext::audio_ports::host::Rescan,
                  clap::ext::note_ports::host::SupportedDialects,

src/common/serialization/clap/README.md

@@ -18,7 +18,7 @@ Yabridge currently tracks CLAP 1.1.1. The implementation status for CLAP's core
 | `clap.audio-ports-config` | :x: Not supported yet |
 | `clap.event-registry`     | :x: Not supported yet |
 | `clap.gui`                | :x: Not supported yet |
-| `clap.latency`            | :x: Not supported yet |
+| `clap.latency`            | :heavy_check_mark:    |
 | `clap.log`                | :x: Not supported yet |
 | `clap.note-name`          | :x: Not supported yet |
 | `clap.note-ports`         | :heavy_check_mark:    |

src/common/serialization/clap/ext/latency.h

@@ -0,0 +1,67 @@
+// yabridge: a Wine plugin bridge
+// Copyright (C) 2020-2022 Robbert van der Helm
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more delatencys.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#pragma once
+
+#include <clap/ext/latency.h>
+
+#include "../../common.h"
+
+// Serialization messages for `clap/ext/latency.h`
+
+namespace clap {
+namespace ext {
+namespace latency {
+
+namespace plugin {
+
+/**
+ * Message struct for `clap_plugin_latency::get()`.
+ */
+struct Get {
+    using Response = PrimitiveResponse<uint32_t>;
+
+    native_size_t instance_id;
+
+    template <typename S>
+    void serialize(S& s) {
+        s.value8b(instance_id);
+    }
+};
+
+}  // namespace plugin
+
+namespace host {
+
+/**
+ * Message struct for `clap_host_latency::changed()`.
+ */
+struct Changed {
+    using Response = Ack;
+
+    native_size_t owner_instance_id;
+
+    template <typename S>
+    void serialize(S& s) {
+        s.value8b(owner_instance_id);
+    }
+};
+
+}  // namespace host
+
+}  // namespace latency
+}  // namespace ext
+}  // namespace clap

src/common/serialization/clap/host.cpp

@@ -17,6 +17,7 @@
 #include "host.h"
 
 #include <clap/ext/audio-ports.h>
+#include <clap/ext/latency.h>
 #include <clap/ext/note-ports.h>
 #include <clap/ext/params.h>
 #include <clap/ext/tail.h>
@@ -31,9 +32,10 @@ Host::Host(const clap_host_t& original)
       url(original.url ? std::optional(original.url) : std::nullopt),
       version((assert(original.version), original.version)) {}
 
-std::array<std::pair<bool, const char*>, 4> SupportedHostExtensions::list()
+std::array<std::pair<bool, const char*>, 5> SupportedHostExtensions::list()
     const noexcept {
     return {std::pair(supports_audio_ports, CLAP_EXT_AUDIO_PORTS),
+            std::pair(supports_latency, CLAP_EXT_LATENCY),
             std::pair(supports_note_ports, CLAP_EXT_NOTE_PORTS),
             std::pair(supports_params, CLAP_EXT_PARAMS),
             std::pair(supports_tail, CLAP_EXT_TAIL)};

src/common/serialization/clap/host.h

@@ -82,6 +82,7 @@ struct Host {
 struct SupportedHostExtensions {
     // Don't forget to add new extensions to below method
     bool supports_audio_ports = false;
+    bool supports_latency = false;
     bool supports_note_ports = false;
     bool supports_params = false;
     bool supports_tail = false;
@@ -90,11 +91,12 @@ struct SupportedHostExtensions {
      * Get a list of `<bool, extension_name>` tuples for the supported
      * extensions. Used during logging.
      */
-    std::array<std::pair<bool, const char*>, 4> list() const noexcept;
+    std::array<std::pair<bool, const char*>, 5> list() const noexcept;
 
     template <typename S>
     void serialize(S& s) {
         s.value1b(supports_audio_ports);
+        s.value1b(supports_latency);
         s.value1b(supports_note_ports);
         s.value1b(supports_params);
         s.value1b(supports_tail);

src/common/serialization/clap/plugin.cpp

@@ -17,6 +17,7 @@
 #include "plugin.h"
 
 #include <clap/ext/audio-ports.h>
+#include <clap/ext/latency.h>
 #include <clap/ext/note-ports.h>
 #include <clap/ext/params.h>
 #include <clap/ext/tail.h>
@@ -79,9 +80,10 @@ const clap_plugin_descriptor_t* Descriptor::get() const {
     return &clap_descriptor;
 }
 
-std::array<std::pair<bool, const char*>, 4> SupportedPluginExtensions::list()
+std::array<std::pair<bool, const char*>, 5> SupportedPluginExtensions::list()
     const noexcept {
     return {std::pair(supports_audio_ports, CLAP_EXT_AUDIO_PORTS),
+            std::pair(supports_latency, CLAP_EXT_LATENCY),
             std::pair(supports_note_ports, CLAP_EXT_NOTE_PORTS),
             std::pair(supports_params, CLAP_EXT_PARAMS),
             std::pair(supports_tail, CLAP_EXT_TAIL)};

src/common/serialization/clap/plugin.h

@@ -115,6 +115,7 @@ struct Descriptor {
 struct SupportedPluginExtensions {
     // Don't forget to add new extensions to below method
     bool supports_audio_ports = false;
+    bool supports_latency = false;
     bool supports_note_ports = false;
     bool supports_params = false;
     bool supports_tail = false;
@@ -123,11 +124,12 @@ struct SupportedPluginExtensions {
      * Get a list of `<bool, extension_name>` tuples for the supported
      * extensions. Used during logging.
      */
-    std::array<std::pair<bool, const char*>, 3> list() const noexcept;
+    std::array<std::pair<bool, const char*>, 5> list() const noexcept;
 
     template <typename S>
     void serialize(S& s) {
         s.value1b(supports_audio_ports);
+        s.value1b(supports_latency);
         s.value1b(supports_note_ports);
         s.value1b(supports_params);
         s.value1b(supports_tail);