Initial support for CLAP plugins

.gitmodules

@@ -46,3 +46,9 @@
 [submodule "src/3rdparty/hiir/hiir"]
 	path = src/3rdparty/hiir/hiir
 	url = https://github.com/LostRobotMusic/hiir
+[submodule "src/3rdparty/clap/clap"]
+	path = src/3rdparty/clap/clap
+	url = https://github.com/free-audio/clap.git
+[submodule "src/3rdparty/clap/clap-helpers"]
+	path = src/3rdparty/clap/clap-helpers
+	url = https://github.com/free-audio/clap-helpers.git

CMakeLists.txt

@@ -75,6 +75,7 @@ OPTION(WANT_OSS 	"Include Open Sound System support" ON)
 OPTION(WANT_CALF	"Include CALF LADSPA plugins" ON)
 OPTION(WANT_CAPS	"Include C* Audio Plugin Suite (LADSPA plugins)" ON)
 OPTION(WANT_CARLA	"Include Carla plugin" ON)
+OPTION(WANT_CLAP	"Include CLAP plugins" ON)
 OPTION(WANT_CMT		"Include Computer Music Toolkit LADSPA plugins" ON)
 OPTION(WANT_JACK	"Include JACK (Jack Audio Connection Kit) support" ON)
 OPTION(WANT_WEAKJACK	"Loosely link JACK libraries" ON)
@@ -276,6 +277,13 @@ ELSE(WANT_SUIL)
 	SET(STATUS_SUIL "not built as requested")
 ENDIF(WANT_SUIL)
 
+IF(WANT_CLAP)
+	SET(LMMS_HAVE_CLAP TRUE)
+	SET(STATUS_CLAP "OK")
+ELSE(WANT_CLAP)
+	SET(STATUS_CLAP "not built as requested")
+ENDIF(WANT_CLAP)
+
 IF(WANT_CALF)
 	SET(LMMS_HAVE_CALF TRUE)
 	SET(STATUS_CALF "OK")
@@ -807,6 +815,7 @@ MESSAGE(
 "----------------\n"
 "* Lv2 plugins                 : ${STATUS_LV2}\n"
 "* SUIL for plugin UIs         : ${STATUS_SUIL}\n"
+"* CLAP plugins                : ${STATUS_CLAP}\n"
 "* ZynAddSubFX instrument      : ${STATUS_ZYN}\n"
 "* Carla Patchbay & Rack       : ${STATUS_CARLA}\n"
 "* SoundFont2 player           : ${STATUS_FLUIDSYNTH}\n"

cmake/modules/PluginList.cmake

@@ -30,6 +30,8 @@ SET(LMMS_PLUGIN_LIST
 	CarlaBase
 	CarlaPatchbay
 	CarlaRack
+	ClapEffect
+	ClapInstrument
 	Compressor
 	CrossoverEQ
 	Delay

include/AutomatableModel.h

@@ -471,6 +471,7 @@ class LMMS_EXPORT FloatModel : public TypedAutomatableModel<float>
 	QString displayValue( const float val ) const override;
 } ;
 
+// TODO: Add DoubleModel?
 
 class LMMS_EXPORT IntModel : public TypedAutomatableModel<int>
 {

include/ClapAudioPorts.h

@@ -0,0 +1,165 @@
+/*
+ * ClapAudioPorts.h - Implements CLAP audio ports extension
+ *
+ * Copyright (c) 2024 Dalton Messmer <messmer.dalton/at/gmail.com>
+ *
+ * This file is part of LMMS - https://lmms.io
+ *
+ * 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 2 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 details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program (see COPYING); if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef LMMS_CLAP_AUDIO_PORTS_H
+#define LMMS_CLAP_AUDIO_PORTS_H
+
+#include "lmmsconfig.h"
+
+#ifdef LMMS_HAVE_CLAP
+
+#include <memory>
+#include <vector>
+#include <clap/ext/audio-ports.h>
+
+#include "ClapExtension.h"
+#include "lmms_basics.h"
+#include "lmms_export.h"
+#include "PluginIssue.h"
+#include "PluginPortConfig.h"
+#include "SampleFrame.h"
+
+namespace lmms
+{
+
+//! RAII-enabled CLAP AudioBuffer
+class ClapAudioBuffer
+{
+public:
+	ClapAudioBuffer(std::uint32_t channels, fpp_t frames)
+		: m_channels{channels}
+		, m_frames{frames}
+	{
+		if (channels == 0) { return; }
+		m_data = new float*[m_channels]();
+		for (std::uint32_t channel = 0; channel < m_channels; ++channel)
+		{
+			m_data[channel] = new float[m_frames]();
+		}
+	}
+
+	ClapAudioBuffer(const ClapAudioBuffer&) = delete;
+	auto operator=(const ClapAudioBuffer&) -> ClapAudioBuffer& = delete;
+
+	ClapAudioBuffer(ClapAudioBuffer&& other) noexcept
+		: m_channels{std::exchange(other.m_channels, 0)}
+		, m_frames{std::exchange(other.m_frames, 0)}
+		, m_data{std::exchange(other.m_data, nullptr)}
+	{
+	}
+
+	auto operator=(ClapAudioBuffer&& other) noexcept -> ClapAudioBuffer&
+	{
+		if (this != &other)
+		{
+			free();
+			m_channels = std::exchange(other.m_channels, 0);
+			m_frames = std::exchange(other.m_frames, 0);
+			m_data = std::exchange(other.m_data, nullptr);
+		}
+		return *this;
+	}
+
+	~ClapAudioBuffer() { free(); }
+
+	//! [channel][frame]
+	auto data() const -> float** { return m_data; }
+
+private:
+
+	void free() noexcept
+	{
+		if (!m_data) { return; }
+		for (std::uint32_t channel = 0; channel < m_channels; ++channel)
+		{
+			if (m_data[channel]) { delete[] m_data[channel]; }
+		}
+		delete[] m_data;
+	}
+
+	std::uint32_t m_channels;
+	fpp_t m_frames;
+	float** m_data = nullptr;
+};
+
+class LMMS_EXPORT ClapAudioPorts final
+	: public ClapExtension<clap_host_audio_ports, clap_plugin_audio_ports>
+	, public PluginPortConfig
+{
+public:
+	ClapAudioPorts(ClapInstance* parent);
+	~ClapAudioPorts() override;
+
+	auto init(clap_process& process) noexcept -> bool;
+
+	auto extensionId() const -> std::string_view override { return CLAP_EXT_AUDIO_PORTS; }
+
+	void copyBuffersFromCore(const SampleFrame* buffer, fpp_t frames);
+	void copyBuffersToCore(SampleFrame* buffer, fpp_t frames) const;
+
+private:
+	auto hostExtImpl() const -> const clap_host_audio_ports* override { return nullptr; } // not impl for host yet
+	auto checkSupported(const clap_plugin_audio_ports& ext) -> bool override;
+
+	std::vector<PluginIssue> m_issues; // TODO: Remove?
+
+	/**
+	 * Process-related
+	*/
+	std::vector<clap_audio_buffer_t> m_audioIn, m_audioOut;
+	clap_audio_buffer_t* m_audioInActive = nullptr; //!< Pointer to m_audioIn element used by LMMS
+	clap_audio_buffer_t* m_audioOutActive = nullptr; //!< Pointer to m_audioOut element used by LMMS
+
+	std::vector<ClapAudioBuffer> m_audioInBuffers, m_audioOutBuffers; //!< [port][channel][frame]
+
+	/**
+	 * Ports
+	 */
+	enum class AudioPortType
+	{
+		Unsupported,
+		Mono,
+		Stereo
+	};
+
+	struct AudioPort
+	{
+		clap_audio_port_info info{};
+		std::uint32_t index = 0; //!< Index on plugin side, not m_audioPorts***
+		bool isInput = false;
+		PluginPortConfig::PortType type = PluginPortConfig::PortType::None; // None = unsupported
+		bool used = false; //!< In use by LMMS
+	};
+
+	std::vector<AudioPort> m_audioPortsIn, m_audioPortsOut;
+	AudioPort* m_audioPortInActive = nullptr; //!< Pointer to m_audioPortsIn element used by LMMS
+	AudioPort* m_audioPortOutActive = nullptr; //!< Pointer to m_audioPortsOut element used by LMMS
+
+};
+
+} // namespace lmms
+
+#endif // LMMS_HAVE_CLAP
+
+#endif // LMMS_CLAP_AUDIO_PORTS_H