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annotate DPF-Prymula-audioplugins/dpf/distrho/src/lv2/state.h @ 3:84e66ea83026

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DPF-Prymula-audioplugins-0.231015-2
author prymula <prymula76@outlook.com>
date Mon, 16 Oct 2023 21:53:34 +0200
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1 /*
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2 Copyright 2010-2016 David Robillard <http://drobilla.net>
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3 Copyright 2010 Leonard Ritter <paniq@paniq.org>
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4
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5 Permission to use, copy, modify, and/or distribute this software for any
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6 purpose with or without fee is hereby granted, provided that the above
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7 copyright notice and this permission notice appear in all copies.
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8
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9 THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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10 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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11 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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12 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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13 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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14 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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15 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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16 */
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17
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18 /**
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19 @defgroup state State
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20 @ingroup lv2
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21
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22 An interface for LV2 plugins to save and restore state, see
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23 <http://lv2plug.in/ns/ext/state> for details.
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24
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25 @{
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26 */
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27
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28 #ifndef LV2_STATE_H
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29 #define LV2_STATE_H
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30
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31 #include "lv2.h"
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32
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33 #include <stdbool.h>
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34 #include <stddef.h>
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35 #include <stdint.h>
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36
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37 #define LV2_STATE_URI "http://lv2plug.in/ns/ext/state" ///< http://lv2plug.in/ns/ext/state
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38 #define LV2_STATE_PREFIX LV2_STATE_URI "#" ///< http://lv2plug.in/ns/ext/state#
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39
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40 #define LV2_STATE__State LV2_STATE_PREFIX "State" ///< http://lv2plug.in/ns/ext/state#State
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41 #define LV2_STATE__interface LV2_STATE_PREFIX "interface" ///< http://lv2plug.in/ns/ext/state#interface
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42 #define LV2_STATE__loadDefaultState LV2_STATE_PREFIX "loadDefaultState" ///< http://lv2plug.in/ns/ext/state#loadDefaultState
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43 #define LV2_STATE__freePath LV2_STATE_PREFIX "freePath" ///< http://lv2plug.in/ns/ext/state#freePath
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44 #define LV2_STATE__makePath LV2_STATE_PREFIX "makePath" ///< http://lv2plug.in/ns/ext/state#makePath
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45 #define LV2_STATE__mapPath LV2_STATE_PREFIX "mapPath" ///< http://lv2plug.in/ns/ext/state#mapPath
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46 #define LV2_STATE__state LV2_STATE_PREFIX "state" ///< http://lv2plug.in/ns/ext/state#state
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47 #define LV2_STATE__threadSafeRestore LV2_STATE_PREFIX "threadSafeRestore" ///< http://lv2plug.in/ns/ext/state#threadSafeRestore
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48 #define LV2_STATE__StateChanged LV2_STATE_PREFIX "StateChanged" ///< http://lv2plug.in/ns/ext/state#StateChanged
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49
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50 #ifdef __cplusplus
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51 extern "C" {
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52 #endif
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53
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54 typedef void* LV2_State_Handle; ///< Opaque handle for state save/restore
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55 typedef void* LV2_State_Free_Path_Handle; ///< Opaque handle for state:freePath feature
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56 typedef void* LV2_State_Map_Path_Handle; ///< Opaque handle for state:mapPath feature
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57 typedef void* LV2_State_Make_Path_Handle; ///< Opaque handle for state:makePath feature
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58
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59 /**
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60 Flags describing value characteristics.
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61
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62 These flags are used along with the value's type URI to determine how to
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63 (de-)serialise the value data, or whether it is even possible to do so.
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64 */
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65 typedef enum {
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66 /**
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67 Plain Old Data.
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68
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69 Values with this flag contain no pointers or references to other areas
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70 of memory. It is safe to copy POD values with a simple memcpy and store
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71 them for the duration of the process. A POD value is not necessarily
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72 safe to trasmit between processes or machines (for example, filenames
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73 are POD), see LV2_STATE_IS_PORTABLE for details.
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74
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75 Implementations MUST NOT attempt to copy or serialise a non-POD value if
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76 they do not understand its type (and thus know how to correctly do so).
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77 */
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78 LV2_STATE_IS_POD = 1,
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79
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80 /**
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81 Portable (architecture independent) data.
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82
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83 Values with this flag are in a format that is usable on any
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84 architecture. A portable value saved on one machine can be restored on
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85 another machine regardless of architecture. The format of portable
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86 values MUST NOT depend on architecture-specific properties like
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87 endianness or alignment. Portable values MUST NOT contain filenames.
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88 */
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89 LV2_STATE_IS_PORTABLE = 1 << 1,
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90
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91 /**
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92 Native data.
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93
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94 This flag is used by the host to indicate that the saved data is only
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95 going to be used locally in the currently running process (for things
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96 like instance duplication or snapshots), so the plugin should use the
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97 most efficient representation possible and not worry about serialisation
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98 and portability.
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99 */
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100 LV2_STATE_IS_NATIVE = 1 << 2
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101 } LV2_State_Flags;
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102
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103 /** A status code for state functions. */
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104 typedef enum {
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105 LV2_STATE_SUCCESS = 0, /**< Completed successfully. */
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106 LV2_STATE_ERR_UNKNOWN = 1, /**< Unknown error. */
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107 LV2_STATE_ERR_BAD_TYPE = 2, /**< Failed due to unsupported type. */
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108 LV2_STATE_ERR_BAD_FLAGS = 3, /**< Failed due to unsupported flags. */
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109 LV2_STATE_ERR_NO_FEATURE = 4, /**< Failed due to missing features. */
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110 LV2_STATE_ERR_NO_PROPERTY = 5, /**< Failed due to missing property. */
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111 LV2_STATE_ERR_NO_SPACE = 6 /**< Failed due to insufficient space. */
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112 } LV2_State_Status;
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113
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114 /**
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115 A host-provided function to store a property.
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116 @param handle Must be the handle passed to LV2_State_Interface.save().
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
117 @param key The key to store `value` under (URID).
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parents:
diff changeset
118 @param value Pointer to the value to be stored.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
119 @param size The size of `value` in bytes.
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parents:
diff changeset
120 @param type The type of `value` (URID).
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parents:
diff changeset
121 @param flags LV2_State_Flags for `value`.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
122 @return 0 on success, otherwise a non-zero error code.
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prymula <prymula76@outlook.com>
parents:
diff changeset
123
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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diff changeset
124 The host passes a callback of this type to LV2_State_Interface.save(). This
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
125 callback is called repeatedly by the plugin to store all the properties that
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
126 describe its current state.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
127
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
128 DO NOT INVENT NONSENSE URI SCHEMES FOR THE KEY. Best is to use keys from
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
129 existing vocabularies. If nothing appropriate is available, use http URIs
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
130 that point to somewhere you can host documents so documentation can be made
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
131 resolvable (typically a child of the plugin or project URI). If this is not
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
132 possible, invent a URN scheme, e.g. urn:myproj:whatever. The plugin MUST
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
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133 NOT pass an invalid URI key.
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parents:
diff changeset
134
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parents:
diff changeset
135 The host MAY fail to store a property for whatever reason, but SHOULD
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
136 store any property that is LV2_STATE_IS_POD and LV2_STATE_IS_PORTABLE.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
137 Implementations SHOULD use the types from the LV2 Atom extension
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
138 (http://lv2plug.in/ns/ext/atom) wherever possible. The plugin SHOULD
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
139 attempt to fall-back and avoid the error if possible.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
140
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
141 Note that `size` MUST be > 0, and `value` MUST point to a valid region of
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
142 memory `size` bytes long (this is required to make restore unambiguous).
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parents:
diff changeset
143
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parents:
diff changeset
144 The plugin MUST NOT attempt to use this function outside of the
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
145 LV2_State_Interface.restore() context.
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parents:
diff changeset
146 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
147 typedef LV2_State_Status (*LV2_State_Store_Function)(
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
148 LV2_State_Handle handle,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
149 uint32_t key,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
150 const void* value,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
151 size_t size,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
152 uint32_t type,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
153 uint32_t flags);
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
154
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
155 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
156 A host-provided function to retrieve a property.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
157 @param handle Must be the handle passed to LV2_State_Interface.restore().
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
158 @param key The key of the property to retrieve (URID).
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
159 @param size (Output) If non-NULL, set to the size of the restored value.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
160 @param type (Output) If non-NULL, set to the type of the restored value.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
161 @param flags (Output) If non-NULL, set to the flags for the restored value.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
162 @return A pointer to the restored value (object), or NULL if no value
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
163 has been stored under `key`.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
164
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
165 A callback of this type is passed by the host to
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
166 LV2_State_Interface.restore(). This callback is called repeatedly by the
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
167 plugin to retrieve any properties it requires to restore its state.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
168
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
169 The returned value MUST remain valid until LV2_State_Interface.restore()
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
170 returns. The plugin MUST NOT attempt to use this function, or any value
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
171 returned from it, outside of the LV2_State_Interface.restore() context.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
172 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
173 typedef const void* (*LV2_State_Retrieve_Function)(
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
174 LV2_State_Handle handle,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
175 uint32_t key,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
176 size_t* size,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
177 uint32_t* type,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
178 uint32_t* flags);
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
179
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
180 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
181 LV2 Plugin State Interface.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
182
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
183 When the plugin's extension_data is called with argument
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
184 LV2_STATE__interface, the plugin MUST return an LV2_State_Interface
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
185 structure, which remains valid for the lifetime of the plugin.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
186
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parents:
diff changeset
187 The host can use the contained function pointers to save and restore the
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
188 state of a plugin instance at any time, provided the threading restrictions
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
189 of the functions are met.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
190
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
191 Stored data is only guaranteed to be compatible between instances of plugins
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
192 with the same URI (i.e. if a change to a plugin would cause a fatal error
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
193 when restoring state saved by a previous version of that plugin, the plugin
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
194 URI MUST change just as it must when ports change incompatibly). Plugin
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
195 authors should consider this possibility, and always store sensible data
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
196 with meaningful types to avoid such problems in the future.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
197 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
198 typedef struct {
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
199 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
200 Save plugin state using a host-provided `store` callback.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
201
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
202 @param instance The instance handle of the plugin.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
203 @param store The host-provided store callback.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
204 @param handle An opaque pointer to host data which MUST be passed as the
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
205 handle parameter to `store` if it is called.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
206 @param flags Flags describing desired properties of this save. These
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
207 flags may be used to determine the most appropriate values to store.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
208 @param features Extensible parameter for passing any additional
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
209 features to be used for this save.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
210
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
211 The plugin is expected to store everything necessary to completely
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
212 restore its state later. Plugins SHOULD store simple POD data whenever
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
213 possible, and consider the possibility of state being restored much
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
214 later on a different machine.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
215
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
216 The `handle` pointer and `store` function MUST NOT be used
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
217 beyond the scope of save().
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
218
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
219 This function has its own special threading class: it may not be called
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
220 concurrently with any "Instantiation" function, but it may be called
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
221 concurrently with functions in any other class, unless the definition of
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
222 that class prohibits it (for example, it may not be called concurrently
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
223 with a "Discovery" function, but it may be called concurrently with an
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
224 "Audio" function. The plugin is responsible for any locking or
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
225 lock-free techniques necessary to make this possible.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
226
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
227 Note that in the simple case where state is only modified by restore(),
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
228 there are no synchronization issues since save() is never called
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
229 concurrently with restore() (though run() may read it during a save).
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
230
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
231 Plugins that dynamically modify state while running, however, must take
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
232 care to do so in such a way that a concurrent call to save() will save a
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
233 consistent representation of plugin state for a single instant in time.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
234 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
235 LV2_State_Status (*save)(LV2_Handle instance,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
236 LV2_State_Store_Function store,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
237 LV2_State_Handle handle,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
238 uint32_t flags,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
239 const LV2_Feature *const * features);
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parents:
diff changeset
240
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parents:
diff changeset
241 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
242 Restore plugin state using a host-provided `retrieve` callback.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
243
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diff changeset
244 @param instance The instance handle of the plugin.
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parents:
diff changeset
245 @param retrieve The host-provided retrieve callback.
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parents:
diff changeset
246 @param handle An opaque pointer to host data which MUST be passed as the
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
247 handle parameter to `retrieve` if it is called.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
248 @param flags Currently unused.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
249 @param features Extensible parameter for passing any additional
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
250 features to be used for this restore.
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parents:
diff changeset
251
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parents:
diff changeset
252 The plugin MAY assume a restored value was set by a previous call to
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
253 LV2_State_Interface.save() by a plugin with the same URI.
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prymula <prymula76@outlook.com>
parents:
diff changeset
254
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parents:
diff changeset
255 The plugin MUST gracefully fall back to a default value when a value can
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
256 not be retrieved. This allows the host to reset the plugin state with
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
257 an empty map.
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prymula <prymula76@outlook.com>
parents:
diff changeset
258
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prymula <prymula76@outlook.com>
parents:
diff changeset
259 The `handle` pointer and `store` function MUST NOT be used
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prymula <prymula76@outlook.com>
parents:
diff changeset
260 beyond the scope of restore().
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
261
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prymula <prymula76@outlook.com>
parents:
diff changeset
262 This function is in the "Instantiation" threading class as defined by
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
263 LV2. This means it MUST NOT be called concurrently with any other
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
264 function on the same plugin instance.
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prymula <prymula76@outlook.com>
parents:
diff changeset
265 */
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parents:
diff changeset
266 LV2_State_Status (*restore)(LV2_Handle instance,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
267 LV2_State_Retrieve_Function retrieve,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
268 LV2_State_Handle handle,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
269 uint32_t flags,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
270 const LV2_Feature *const * features);
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
271 } LV2_State_Interface;
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parents:
diff changeset
272
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parents:
diff changeset
273 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
274 Feature data for state:mapPath (@ref LV2_STATE__mapPath).
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
275 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
276 typedef struct {
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
277 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
278 Opaque host data.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
279 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
280 LV2_State_Map_Path_Handle handle;
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
281
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parents:
diff changeset
282 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
283 Map an absolute path to an abstract path for use in plugin state.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
284 @param handle MUST be the `handle` member of this struct.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
285 @param absolute_path The absolute path of a file.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
286 @return An abstract path suitable for use in plugin state.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
287
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
288 The plugin MUST use this function to map any paths that will be stored
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
289 in plugin state. The returned value is an abstract path which MAY not
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
290 be an actual file system path; absolute_path() MUST be used to map
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
291 it to an actual path in order to use the file.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
292
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
293 Plugins MUST NOT make any assumptions about abstract paths except that
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
294 they can be mapped back to the absolute path of the "same" file (though
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
295 not necessarily the same original path) using absolute_path().
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
296
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parents:
diff changeset
297 This function may only be called within the context of
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
298 LV2_State_Interface methods. The caller must free the returned value
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
299 with LV2_State_Free_Path.free_path().
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
300 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
301 char* (*abstract_path)(LV2_State_Map_Path_Handle handle,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
302 const char* absolute_path);
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
303
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prymula <prymula76@outlook.com>
parents:
diff changeset
304 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
305 Map an abstract path from plugin state to an absolute path.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
306 @param handle MUST be the `handle` member of this struct.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
307 @param abstract_path An abstract path (typically from plugin state).
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
308 @return An absolute file system path.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
309
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
310 The plugin MUST use this function in order to actually open or otherwise
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
311 use any paths loaded from plugin state.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
312
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
313 This function may only be called within the context of
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
314 LV2_State_Interface methods. The caller must free the returned value
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
315 with LV2_State_Free_Path.free_path().
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
316 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
317 char* (*absolute_path)(LV2_State_Map_Path_Handle handle,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
318 const char* abstract_path);
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
319 } LV2_State_Map_Path;
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
320
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
321 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
322 Feature data for state:makePath (@ref LV2_STATE__makePath).
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
323 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
324 typedef struct {
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
325 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
326 Opaque host data.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
327 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
328 LV2_State_Make_Path_Handle handle;
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
329
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
330 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
331 Return a path the plugin may use to create a new file.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
332 @param handle MUST be the `handle` member of this struct.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
333 @param path The path of the new file within a namespace unique to this
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
334 plugin instance.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
335 @return The absolute path to use for the new file.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
336
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
337 This function can be used by plugins to create files and directories,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
338 either at state saving time (if this feature is passed to
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
339 LV2_State_Interface.save()) or any time (if this feature is passed to
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
340 LV2_Descriptor.instantiate()).
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
341
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
342 The host MUST do whatever is necessary for the plugin to be able to
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
343 create a file at the returned path (for example, using fopen()),
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
344 including creating any leading directories.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
345
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
346 If this function is passed to LV2_Descriptor.instantiate(), it may be
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
347 called from any non-realtime context. If it is passed to
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
348 LV2_State_Interface.save(), it may only be called within the dynamic
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
349 scope of that function call.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
350
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
351 The caller must free the returned value with
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
352 LV2_State_Free_Path.free_path().
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
353 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
354 char* (*path)(LV2_State_Make_Path_Handle handle,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
355 const char* path);
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
356 } LV2_State_Make_Path;
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
357
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
358 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
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359 Feature data for state:freePath (@ref LV2_STATE__freePath).
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360 */
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361 typedef struct {
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362 /**
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363 Opaque host data.
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364 */
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365 LV2_State_Free_Path_Handle handle;
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366
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367 /**
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368 Free a path returned by a state feature.
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369
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370 @param handle MUST be the `handle` member of this struct.
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371 @param path The path previously returned by a state feature.
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372
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373 This function can be used by plugins to free paths allocated by the host
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374 and returned by state features (LV2_State_Map_Path.abstract_path(),
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375 LV2_State_Map_Path.absolute_path(), and LV2_State_Make_Path.path()).
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376 */
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377 void (*free_path)(LV2_State_Free_Path_Handle handle,
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378 char* path);
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379 } LV2_State_Free_Path;
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380
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381 #ifdef __cplusplus
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382 } /* extern "C" */
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383 #endif
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384
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385 #endif /* LV2_STATE_H */
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386
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387 /**
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388 @}
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389 */