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annotate DPF-Prymula-audioplugins/dpf/distrho/src/lv2/event.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 2008-2016 David Robillard <http://drobilla.net>
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3 Copyright 2006-2007 Lars Luthman <lars.luthman@gmail.com>
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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 event Event
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20
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21 Generic time-stamped events, see <http://lv2plug.in/ns/ext/event> for
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22 details.
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23
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24 @{
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25 */
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26
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27 #ifndef LV2_EVENT_H
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28 #define LV2_EVENT_H
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29
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30 #define LV2_EVENT_URI "http://lv2plug.in/ns/ext/event" ///< http://lv2plug.in/ns/ext/event
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31 #define LV2_EVENT_PREFIX LV2_EVENT_URI "#" ///< http://lv2plug.in/ns/ext/event#
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32
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33 #define LV2_EVENT__Event LV2_EVENT_PREFIX "Event" ///< http://lv2plug.in/ns/ext/event#Event
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34 #define LV2_EVENT__EventPort LV2_EVENT_PREFIX "EventPort" ///< http://lv2plug.in/ns/ext/event#EventPort
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35 #define LV2_EVENT__FrameStamp LV2_EVENT_PREFIX "FrameStamp" ///< http://lv2plug.in/ns/ext/event#FrameStamp
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36 #define LV2_EVENT__TimeStamp LV2_EVENT_PREFIX "TimeStamp" ///< http://lv2plug.in/ns/ext/event#TimeStamp
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37 #define LV2_EVENT__generatesTimeStamp LV2_EVENT_PREFIX "generatesTimeStamp" ///< http://lv2plug.in/ns/ext/event#generatesTimeStamp
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38 #define LV2_EVENT__generic LV2_EVENT_PREFIX "generic" ///< http://lv2plug.in/ns/ext/event#generic
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39 #define LV2_EVENT__inheritsEvent LV2_EVENT_PREFIX "inheritsEvent" ///< http://lv2plug.in/ns/ext/event#inheritsEvent
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40 #define LV2_EVENT__inheritsTimeStamp LV2_EVENT_PREFIX "inheritsTimeStamp" ///< http://lv2plug.in/ns/ext/event#inheritsTimeStamp
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41 #define LV2_EVENT__supportsEvent LV2_EVENT_PREFIX "supportsEvent" ///< http://lv2plug.in/ns/ext/event#supportsEvent
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42 #define LV2_EVENT__supportsTimeStamp LV2_EVENT_PREFIX "supportsTimeStamp" ///< http://lv2plug.in/ns/ext/event#supportsTimeStamp
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43
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44 #define LV2_EVENT_AUDIO_STAMP 0 ///< Special timestamp type for audio frames
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45
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46 #include <stdint.h>
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47
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48 #ifdef __cplusplus
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49 extern "C" {
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50 #endif
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51
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52 /**
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53 The best Pulses Per Quarter Note for tempo-based uint32_t timestamps.
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54 Equal to 2^12 * 5 * 7 * 9 * 11 * 13 * 17, which is evenly divisble
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55 by all integers from 1 through 18 inclusive, and powers of 2 up to 2^12.
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56 */
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57 static const uint32_t LV2_EVENT_PPQN = 3136573440U;
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58
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59 /**
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60 An LV2 event (header only).
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61
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62 LV2 events are generic time-stamped containers for any type of event.
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63 The type field defines the format of a given event's contents.
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64
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65 This struct defines the header of an LV2 event. An LV2 event is a single
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66 chunk of POD (plain old data), usually contained in a flat buffer (see
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67 LV2_EventBuffer below). Unless a required feature says otherwise, hosts may
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68 assume a deep copy of an LV2 event can be created safely using a simple:
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69
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70 memcpy(ev_copy, ev, sizeof(LV2_Event) + ev->size); (or equivalent)
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71 */
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72 typedef struct {
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73 /**
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74 The frames portion of timestamp. The units used here can optionally be
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75 set for a port (with the lv2ev:timeUnits property), otherwise this is
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76 audio frames, corresponding to the sample_count parameter of the LV2 run
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77 method (e.g. frame 0 is the first frame for that call to run).
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78 */
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79 uint32_t frames;
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80
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81 /**
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82 The sub-frames portion of timestamp. The units used here can optionally
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83 be set for a port (with the lv2ev:timeUnits property), otherwise this is
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84 1/(2^32) of an audio frame.
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85 */
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86 uint32_t subframes;
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87
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88 /**
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89 The type of this event, as a number which represents some URI
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90 defining an event type. This value MUST be some value previously
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91 returned from a call to the uri_to_id function defined in the LV2
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92 URI map extension (see lv2_uri_map.h).
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93 There are special rules which must be followed depending on the type
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94 of an event. If the plugin recognizes an event type, the definition
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95 of that event type will describe how to interpret the event, and
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96 any required behaviour. Otherwise, if the type is 0, this event is a
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97 non-POD event and lv2_event_unref MUST be called if the event is
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98 'dropped' (see above). Even if the plugin does not understand an event,
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99 it may pass the event through to an output by simply copying (and NOT
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100 calling lv2_event_unref). These rules are designed to allow for generic
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101 event handling plugins and large non-POD events, but with minimal hassle
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102 on simple plugins that "don't care" about these more advanced features.
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103 */
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104 uint16_t type;
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105
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106 /**
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107 The size of the data portion of this event in bytes, which immediately
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108 follows. The header size (12 bytes) is not included in this value.
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109 */
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110 uint16_t size;
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111
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112 /* size bytes of data follow here */
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113 } LV2_Event;
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114
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parents:
diff changeset
115
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
116 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
117 A buffer of LV2 events (header only).
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
118
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
119 Like events (which this contains) an event buffer is a single chunk of POD:
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
120 the entire buffer (including contents) can be copied with a single memcpy.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
121 The first contained event begins sizeof(LV2_EventBuffer) bytes after the
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
122 start of this struct.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
123
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
124 After this header, the buffer contains an event header (defined by struct
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
125 LV2_Event), followed by that event's contents (padded to 64 bits), followed
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
126 by another header, etc:
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
127
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
128 | | | | | | |
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
129 | | | | | | | | | | | | | | | | | | | | | | | | |
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
130 |FRAMES |SUBFRMS|TYP|LEN|DATA..DATA..PAD|FRAMES | ...
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
131 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
132 typedef struct {
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
133 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
134 The contents of the event buffer. This may or may not reside in the
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
135 same block of memory as this header, plugins must not assume either.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
136 The host guarantees this points to at least capacity bytes of allocated
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
137 memory (though only size bytes of that are valid events).
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
138 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
139 uint8_t* data;
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 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
142 The size of this event header in bytes (including everything).
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
143
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
144 This is to allow for extending this header in the future without
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
145 breaking binary compatibility. Whenever this header is copied,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
146 it MUST be done using this field (and NOT the sizeof this struct).
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
147 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
148 uint16_t header_size;
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
149
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
150 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
151 The type of the time stamps for events in this buffer.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
152 As a special exception, '0' always means audio frames and subframes
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
153 (1/UINT32_MAX'th of a frame) in the sample rate passed to instantiate.
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 INPUTS: The host must set this field to the numeric ID of some URI
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
156 defining the meaning of the frames/subframes fields of contained events
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
157 (obtained by the LV2 URI Map uri_to_id function with the URI of this
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
158 extension as the 'map' argument, see lv2_uri_map.h). The host must
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
159 never pass a plugin a buffer which uses a stamp type the plugin does not
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
160 'understand'. The value of this field must never change, except when
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
161 connect_port is called on the input port, at which time the host MUST
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
162 have set the stamp_type field to the value that will be used for all
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
163 subsequent run calls.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
164
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
165 OUTPUTS: The plugin may set this to any value that has been returned
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
166 from uri_to_id with the URI of this extension for a 'map' argument.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
167 When connected to a buffer with connect_port, output ports MUST set this
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
168 field to the type of time stamp they will be writing. On any call to
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
169 connect_port on an event input port, the plugin may change this field on
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
170 any output port, it is the responsibility of the host to check if any of
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
171 these values have changed and act accordingly.
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 uint16_t stamp_type;
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
174
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
175 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
176 The number of events in this buffer.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
177
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
178 INPUTS: The host must set this field to the number of events contained
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
179 in the data buffer before calling run(). The plugin must not change
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
180 this field.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
181
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
182 OUTPUTS: The plugin must set this field to the number of events it has
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
183 written to the buffer before returning from run(). Any initial value
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
184 should be ignored by the plugin.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
185 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
186 uint32_t event_count;
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
187
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
188 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
189 The size of the data buffer in bytes.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
190 This is set by the host and must not be changed by the plugin.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
191 The host is allowed to change this between run() calls.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
192 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
193 uint32_t capacity;
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
194
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
195 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
196 The size of the initial portion of the data buffer containing data.
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 INPUTS: The host must set this field to the number of bytes used
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
199 by all events it has written to the buffer (including headers)
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
200 before calling the plugin's run().
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
201 The plugin must not change this field.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
202
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
203 OUTPUTS: The plugin must set this field to the number of bytes
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
204 used by all events it has written to the buffer (including headers)
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
205 before returning from run().
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
206 Any initial value should be ignored by the plugin.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
207 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
208 uint32_t size;
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
209 } LV2_Event_Buffer;
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
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
212 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
213 Opaque pointer to host data.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
214 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
215 typedef void* LV2_Event_Callback_Data;
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
216
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
217
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 Non-POD events feature.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
220
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
221 To support this feature the host must pass an LV2_Feature struct to the
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
222 plugin's instantiate method with URI "http://lv2plug.in/ns/ext/event"
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
223 and data pointed to an instance of this struct. Note this feature
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
224 is not mandatory to support the event extension.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
225 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
226 typedef struct {
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
227 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
228 Opaque pointer to host data.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
229
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
230 The plugin MUST pass this to any call to functions in this struct.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
231 Otherwise, it must not be interpreted in any way.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
232 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
233 LV2_Event_Callback_Data callback_data;
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 /**
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
236 Take a reference to a non-POD event.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
237
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
238 If a plugin receives an event with type 0, it means the event is a
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239 pointer to some object in memory and not a flat sequence of bytes
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240 in the buffer. When receiving a non-POD event, the plugin already
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241 has an implicit reference to the event. If the event is stored AND
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242 passed to an output, lv2_event_ref MUST be called on that event.
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243 If the event is only stored OR passed through, this is not necessary
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244 (as the plugin already has 1 implicit reference).
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245
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246 @param event An event received at an input that will not be copied to
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247 an output or stored in any way.
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248
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249 @param context The calling context. Like event types, this is a mapped
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250 URI, see lv2_context.h. Simple plugin with just a run() method should
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251 pass 0 here (the ID of the 'standard' LV2 run context). The host
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252 guarantees that this function is realtime safe iff the context is
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253 realtime safe.
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254
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255 PLUGINS THAT VIOLATE THESE RULES MAY CAUSE CRASHES AND MEMORY LEAKS.
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256 */
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257 uint32_t (*lv2_event_ref)(LV2_Event_Callback_Data callback_data,
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258 LV2_Event* event);
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259
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260 /**
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261 Drop a reference to a non-POD event.
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262
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263 If a plugin receives an event with type 0, it means the event is a
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264 pointer to some object in memory and not a flat sequence of bytes
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265 in the buffer. If the plugin does not pass the event through to
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266 an output or store it internally somehow, it MUST call this function
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267 on the event (more information on using non-POD events below).
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268
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269 @param event An event received at an input that will not be copied to an
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270 output or stored in any way.
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271
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272 @param context The calling context. Like event types, this is a mapped
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273 URI, see lv2_context.h. Simple plugin with just a run() method should
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274 pass 0 here (the ID of the 'standard' LV2 run context). The host
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275 guarantees that this function is realtime safe iff the context is
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276 realtime safe.
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277
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278 PLUGINS THAT VIOLATE THESE RULES MAY CAUSE CRASHES AND MEMORY LEAKS.
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279 */
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280 uint32_t (*lv2_event_unref)(LV2_Event_Callback_Data callback_data,
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281 LV2_Event* event);
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282 } LV2_Event_Feature;
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283
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284 #ifdef __cplusplus
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285 } /* extern "C" */
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286 #endif
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287
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288 #endif /* LV2_EVENT_H */
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289
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290 /**
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291 @}
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292 */