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New library for components

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Based off the work of Paul and adapted for Tenacity.

Original commit: 54b5f7d12c

Co-authored-by: Paul Licameli <paul.licameli@audacityteam.org>
Signed-off-by: Panagiotis Vasilopoulos <hello@alwayslivid.com>
This commit is contained in:
Panagiotis Vasilopoulos
2021-09-24 01:46:07 +02:00
parent eb774a449c
commit 9d189dc3d2
55 changed files with 236 additions and 139 deletions
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libraries/lib-components/ModuleInterface.h Normal file
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/**********************************************************************
Tenacity
ModuleInterface.h
Leland Lucius
Copyright (c) 2014, Audacity Team
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
**********************************************************************/
#ifndef __AUDACITY_MODULEINTERFACE_H__
#define __AUDACITY_MODULEINTERFACE_H__
#include <functional>
#include <memory>
#include "Identifier.h"
#include "ComponentInterface.h"
#include "PluginInterface.h"
// ============================================================================
//
// Don't even think about adding module types, like effect, importer, etc. in
// here. The module interface should not have to change when new types of
// plugins are added to Audacity.
//
// In addition a single module may want to provide multiple plugin types.
// ============================================================================
// ============================================================================
///
/// ModuleInterface is a generic dll or so interface for Audacity, that is
/// used for plug ins. Classes derived from it can handle more specific plug
/// in types.
///
// ============================================================================
class ModuleInterface /* not final */ : public ComponentInterface
{
public:
virtual ~ModuleInterface();
// Called immediately after creation to give the instance a chance to
// initialize. Return "true" if initialziation was successful.
virtual bool Initialize() = 0;
// Called just prior to deletion to allow releasing any resources.
virtual void Terminate() = 0;
// A symbol identifying the family of plugin provided by this module;
// if it is not empty, then the family as a whole can be enabled or
// disabled by the user in Preferences
virtual EffectFamilySymbol GetOptionalFamilySymbol() = 0;
// "Paths" returned by FindPluginPaths() and passed back to
// DiscoverPluginsAtPath() have module-specific meaning.
// They are not necessarily file system paths to existent files that
// could be placed in any folder and queried for
// plugin information.
// This function returns nonempty only when that is the case, and lists
// the possible extensions of such files (an empty string in a nonempty
// array means any file is a candidate).
virtual const FileExtensions &GetFileExtensions() = 0;
// Returns empty, or else, where to copy a plug-in file or bundle.
// Drag-and-drop is supported only if GetFileExtensions() returns nonempty and
// this function returns nonempty.
virtual FilePath InstallPath() = 0;
// Modules providing a single or static set of plugins may use
// AutoRegisterPlugins() to register those plugins.
virtual bool AutoRegisterPlugins(PluginManagerInterface & pluginManager) = 0;
// For modules providing an interface to other dynamically loaded plugins,
// the module returns a list of path names that will be presented to the
// user as "New" for enablement.
virtual PluginPaths FindPluginPaths(PluginManagerInterface & pluginManager) = 0;
// Once the user selects desired paths from FindPluginPaths(),
// a call to DiscoverPluginsAtPath()
// will be made to request registration of one or more plugins. If the module must create
// an instance of the plugin to register it, then the instance should be deleted
// after registration.
// May discover more than one plug-in at the path, and
// may call-back with paths not equal to path (perhaps appending
// other information to it).
// Error message does not need to mention the path and may be nonempty
// even if some plugins are also discovered successfully.
// Return value is the number of plugins found.
using RegistrationCallback =
std::function<
const PluginID &(ModuleInterface *, ComponentInterface *) >;
virtual unsigned DiscoverPluginsAtPath(
const PluginPath & path, TranslatableString &errMsg,
const RegistrationCallback &callback )
= 0;
// For modules providing an interface to other dynamically loaded plugins,
// the module returns true if the plugin is still valid, otherwise false.
virtual bool IsPluginValid(const PluginPath & path, bool bFast) = 0;
// When appropriate, CreateInstance() will be called to instantiate the plugin.
virtual std::unique_ptr<ComponentInterface>
CreateInstance(const PluginPath & path) = 0;
};
// ----------------------------------------------------------------------------
// Since there may be multiple embedded modules, the module entry function will
// be declared static so as not to interfere with other modules during link.
// ----------------------------------------------------------------------------
#define DECLARE_MODULE_ENTRY(name) \
static ModuleInterface * name()
// ----------------------------------------------------------------------------
// This will create a class and instance that will register the module entry
// point during Audacity startup. At the appropriate time, the entry point
// will be called to create the module instance.
// ----------------------------------------------------------------------------
// ----------------------------------------------------------------------------
// Provides the base for embedded module registration. If used, a Register()
// method must be supplied explicitly.
// ----------------------------------------------------------------------------
#define DECLARE_BUILTIN_MODULE_BASE(name) \
class name \
{ \
public: \
name() {Register();} \
~name() {Unregister();} \
void Register(); \
void Unregister(); \
}; \
static name name ## _instance;
// ----------------------------------------------------------------------------
// Provides the full embedded module registration process. Nothing further is
// required (other than supplying the module entry point function).
// ----------------------------------------------------------------------------
#define DECLARE_BUILTIN_MODULE(name) \
DECLARE_BUILTIN_MODULE_BASE(name) \
void name::Register() \
{ \
RegisterProvider(AudacityModule); \
} \
void name::Unregister() \
{ \
UnregisterProvider(AudacityModule); \
}
#endif // __AUDACITY_MODULEINTERFACE_H__