Custom preset managagement

This allows to provide a customized preset management. More...

Typedefs
typedef wchar_t	fs_char
typedef char *(*	impact_storage_reader) (const fs_char *filename, void *userdata)
typedef void(*	impact_storage_reader_free) (char *content, void *userdata)
typedef int(*	impact_storage_writer) (const fs_char *filename, const char *content, void *userdata)
typedef int(*	impact_storage_exists) (const fs_char *filename, void *userdata)
typedef fs_char **(*	impact_storage_getall) (void *userdata)
typedef void(*	impact_storage_getall_free) (fs_char **all, void *userdata)
typedef int(*	impact_storage_remove) (const fs_char *filename, void *userdata)
typedef int(*	impact_storage_rename) (const fs_char *from, const fs_char *to, void *userdata)

Enumerations
enum	impact_PresetChange_Kind { change_kind_created = 1 , change_kind_modified , change_kind_deleted }

Functions
void	impact_SetPresetManager (struct impact_CParameters *params, impact_storage_reader reader, impact_storage_reader_free, impact_storage_writer writer, impact_storage_exists exists, impact_storage_getall getall, impact_storage_getall_free getall_free, impact_storage_remove remove, impact_storage_rename rename, int IsReadOnly, void *userdata)
void	impact_PresetManager_InformChange (struct impact_CInstance *instance, const fs_char *relative_path, enum impact_PresetChange_Kind change_kind)

Detailed Description

This allows to provide a customized storage for presets and settings.

By default, the library store data on disk or in memory (see save_path parameter in impact_InitProcess2), but you may use these functions to store data.

It can be used for remote storage, database storage, ...

Known files:

• Files with name ending with .pst are presets
• state.json is the instance state file, holding settings and unsaved preset changes.
• auth.json is the storage for web authentication settings.
• *.onair are used for sharing preset on air name between instances (see STATE_ONAIR in Parameters).

Attention

state.json name can be overriden per instance with STATE_FILENAME in parameters, see Parameters.

File names are in OS native characters ( wchar_t for Windows, char in UTF-8 for others)

Typedef Documentation

fs_char

typedef wchar_t fs_char

Definition at line 435 of file sound4.impact.cl.h.

impact_storage_exists

typedef int(* impact_storage_exists) (const fs_char *filename, void *userdata)

Function to call to test if a stored file exists.

Parameters

filename	the name of the file to test.
userdata	the userdata passed to impact_SetPresetManager

Returns

-1 if not exists, 0 if it exists

Definition at line 474 of file sound4.impact.cl.h.

impact_storage_getall

typedef fs_char **(* impact_storage_getall) (void *userdata)

Function to call to get all stored files' name. Result has to be freed with impact_storage_getall_free callback

Parameters

userdata

the userdata passed to impact_SetPresetManager

Returns

A NULL terminated array of file names

Definition at line 483 of file sound4.impact.cl.h.

impact_storage_getall_free

typedef void(* impact_storage_getall_free) (fs_char **all, void *userdata)

Function to call to free the result of getall.

Parameters

all	the returned value from impact_storage_getall
userdata	the userdata passed to impact_SetPresetManager

Definition at line 491 of file sound4.impact.cl.h.

impact_storage_reader

typedef char *(* impact_storage_reader) (const fs_char *filename, void *userdata)

Function to call to read a stored file, returning its content.

Parameters

filename	the name of the file to read.
userdata	the userdata passed to impact_SetPresetManager

Returns

the UTF-8 content of the file

Definition at line 447 of file sound4.impact.cl.h.

impact_storage_reader_free

typedef void(* impact_storage_reader_free) (char *content, void *userdata)

Function to call to free the result of impact_storage_reader.

Parameters

content	the returned value from impact_storage_reader
userdata	the userdata passed to impact_SetPresetManager

Definition at line 455 of file sound4.impact.cl.h.

impact_storage_remove

typedef int(* impact_storage_remove) (const fs_char *filename, void *userdata)

Function to call to remove a stored file.

Parameters

filename	the name of the file to remove.
userdata	the userdata passed to impact_SetPresetManager

Returns

-1 if failed, 0 if OK

Definition at line 500 of file sound4.impact.cl.h.

impact_storage_rename

typedef int(* impact_storage_rename) (const fs_char *from, const fs_char *to, void *userdata)

Function to call to rename a stored file.

Parameters

from	The source file name (must exist)
to	The destination file name (must not exist)
userdata	the userdata passed to impact_SetPresetManager

Returns

-1 if failed, 0 if OK

Definition at line 510 of file sound4.impact.cl.h.

impact_storage_writer

typedef int(* impact_storage_writer) (const fs_char *filename, const char *content, void *userdata)

Function to call to write a stored file.

Parameters

filename	the name of the file to write.
content	the UTF-8 content to write to the file
userdata	the userdata passed to impact_SetPresetManager

Returns

-1 if failed, 0 if OK

Definition at line 465 of file sound4.impact.cl.h.

Enumeration Type Documentation

impact_PresetChange_Kind

enum impact_PresetChange_Kind

Kind of change on a storage path

Enumerator
change_kind_created	Path has been created.
change_kind_modified	Path has been modified.
change_kind_deleted	Path has been deleted.

Definition at line 543 of file sound4.impact.cl.h.

Function Documentation

impact_PresetManager_InformChange()

void impact_PresetManager_InformChange	(	struct impact_CInstance *	instance,
		const fs_char *	relative_path,
		enum impact_PresetChange_Kind	change_kind
	)

Inform that a change happened in the storage. This must be used only in conjonction with impact_SetPresetManager

Parameters

instance	the processing instance
relative_path	The path which changed, relative to the root storage
change_kind	What happened to this path

impact_SetPresetManager()

void impact_SetPresetManager	(	struct impact_CParameters *	params,
		impact_storage_reader	reader,
		impact_storage_reader_free	,
		impact_storage_writer	writer,
		impact_storage_exists	exists,
		impact_storage_getall	getall,
		impact_storage_getall_free	getall_free,
		impact_storage_remove	remove,
		impact_storage_rename	rename,
		int	IsReadOnly,
		void *	userdata
	)

Setup a custom preset manager. This overrides the save_path in impact_InitProcess2

To dynamically update when storage change, see impact_PresetManager_InformChange

Parameters

params	The params to set up
reader	The function to read a file
writer	The function to write a file
exists	The function to test for a file presence
getall	The function to get all files in storage
getall_free	The function to free the result from getall
remove	The function to remove a file from storage
rename	The function to rename a file
IsReadOnly	Set to 1 if storage is read-only
userdata	The userdata parameter for callbacks