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annotate DPF-Prymula-audioplugins/dpf/distrho/src/clap/ext/params.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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3
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1 #pragma once
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2
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3 #include "../plugin.h"
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4 #include "../string-sizes.h"
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5
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6 /// @page Parameters
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7 /// @brief parameters management
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8 ///
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9 /// Main idea:
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10 ///
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11 /// The host sees the plugin as an atomic entity; and acts as a controller on top of its parameters.
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12 /// The plugin is responsible for keeping its audio processor and its GUI in sync.
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13 ///
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14 /// The host can at any time read parameters' value on the [main-thread] using
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15 /// @ref clap_plugin_params.value().
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16 ///
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17 /// There are two options to communicate parameter value changes, and they are not concurrent.
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18 /// - send automation points during clap_plugin.process()
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19 /// - send automation points during clap_plugin_params.flush(), for parameter changes
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20 /// without processing audio
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21 ///
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22 /// When the plugin changes a parameter value, it must inform the host.
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23 /// It will send @ref CLAP_EVENT_PARAM_VALUE event during process() or flush().
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24 /// If the user is adjusting the value, don't forget to mark the begining and end
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25 /// of the gesture by sending CLAP_EVENT_PARAM_GESTURE_BEGIN and CLAP_EVENT_PARAM_GESTURE_END
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26 /// events.
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27 ///
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28 /// @note MIDI CCs are tricky because you may not know when the parameter adjustment ends.
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29 /// Also if the host records incoming MIDI CC and parameter change automation at the same time,
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30 /// there will be a conflict at playback: MIDI CC vs Automation.
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31 /// The parameter automation will always target the same parameter because the param_id is stable.
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32 /// The MIDI CC may have a different mapping in the future and may result in a different playback.
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33 ///
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34 /// When a MIDI CC changes a parameter's value, set the flag CLAP_EVENT_DONT_RECORD in
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35 /// clap_event_param.header.flags. That way the host may record the MIDI CC automation, but not the
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36 /// parameter change and there won't be conflict at playback.
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37 ///
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38 /// Scenarios:
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39 ///
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40 /// I. Loading a preset
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41 /// - load the preset in a temporary state
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42 /// - call @ref clap_host_params.rescan() if anything changed
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43 /// - call @ref clap_host_latency.changed() if latency changed
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44 /// - invalidate any other info that may be cached by the host
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45 /// - if the plugin is activated and the preset will introduce breaking changes
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46 /// (latency, audio ports, new parameters, ...) be sure to wait for the host
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47 /// to deactivate the plugin to apply those changes.
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48 /// If there are no breaking changes, the plugin can apply them them right away.
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49 /// The plugin is resonsible for updating both its audio processor and its gui.
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50 ///
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51 /// II. Turning a knob on the DAW interface
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52 /// - the host will send an automation event to the plugin via a process() or flush()
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53 ///
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54 /// III. Turning a knob on the Plugin interface
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55 /// - the plugin is responsible for sending the parameter value to its audio processor
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56 /// - call clap_host_params->request_flush() or clap_host->request_process().
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57 /// - when the host calls either clap_plugin->process() or clap_plugin_params->flush(),
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58 /// send an automation event and don't forget to set begin_adjust,
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59 /// end_adjust and should_record flags
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60 ///
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61 /// IV. Turning a knob via automation
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62 /// - host sends an automation point during clap_plugin->process() or clap_plugin_params->flush().
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63 /// - the plugin is responsible for updating its GUI
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64 ///
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65 /// V. Turning a knob via plugin's internal MIDI mapping
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66 /// - the plugin sends a CLAP_EVENT_PARAM_SET output event, set should_record to false
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67 /// - the plugin is responsible to update its GUI
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68 ///
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69 /// VI. Adding or removing parameters
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70 /// - if the plugin is activated call clap_host->restart()
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71 /// - once the plugin isn't active:
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72 /// - apply the new state
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73 /// - if a parameter is gone or is created with an id that may have been used before,
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74 /// call clap_host_params.clear(host, param_id, CLAP_PARAM_CLEAR_ALL)
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75 /// - call clap_host_params->rescan(CLAP_PARAM_RESCAN_ALL)
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76
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77 static CLAP_CONSTEXPR const char CLAP_EXT_PARAMS[] = "clap.params";
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78
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79 #ifdef __cplusplus
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80 extern "C" {
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81 #endif
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82
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83 enum {
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84 // Is this param stepped? (integer values only)
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85 // if so the double value is converted to integer using a cast (equivalent to trunc).
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86 CLAP_PARAM_IS_STEPPED = 1 << 0,
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87
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88 // Useful for for periodic parameters like a phase
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89 CLAP_PARAM_IS_PERIODIC = 1 << 1,
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90
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91 // The parameter should not be shown to the user, because it is currently not used.
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92 // It is not necessary to process automation for this parameter.
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93 CLAP_PARAM_IS_HIDDEN = 1 << 2,
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94
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95 // The parameter can't be changed by the host.
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96 CLAP_PARAM_IS_READONLY = 1 << 3,
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97
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98 // This parameter is used to merge the plugin and host bypass button.
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99 // It implies that the parameter is stepped.
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100 // min: 0 -> bypass off
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101 // max: 1 -> bypass on
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102 CLAP_PARAM_IS_BYPASS = 1 << 4,
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103
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104 // When set:
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105 // - automation can be recorded
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106 // - automation can be played back
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107 //
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108 // The host can send live user changes for this parameter regardless of this flag.
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109 //
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110 // If this parameters affect the internal processing structure of the plugin, ie: max delay, fft
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111 // size, ... and the plugins needs to re-allocate its working buffers, then it should call
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112 // host->request_restart(), and perform the change once the plugin is re-activated.
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113 CLAP_PARAM_IS_AUTOMATABLE = 1 << 5,
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114
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115 // Does this parameter support per note automations?
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116 CLAP_PARAM_IS_AUTOMATABLE_PER_NOTE_ID = 1 << 6,
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117
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diff changeset
118 // Does this parameter support per key automations?
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119 CLAP_PARAM_IS_AUTOMATABLE_PER_KEY = 1 << 7,
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diff changeset
120
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parents:
diff changeset
121 // Does this parameter support per channel automations?
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diff changeset
122 CLAP_PARAM_IS_AUTOMATABLE_PER_CHANNEL = 1 << 8,
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parents:
diff changeset
123
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diff changeset
124 // Does this parameter support per port automations?
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125 CLAP_PARAM_IS_AUTOMATABLE_PER_PORT = 1 << 9,
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diff changeset
126
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diff changeset
127 // Does this parameter support the modulation signal?
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128 CLAP_PARAM_IS_MODULATABLE = 1 << 10,
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129
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diff changeset
130 // Does this parameter support per note modulations?
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131 CLAP_PARAM_IS_MODULATABLE_PER_NOTE_ID = 1 << 11,
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132
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parents:
diff changeset
133 // Does this parameter support per key modulations?
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134 CLAP_PARAM_IS_MODULATABLE_PER_KEY = 1 << 12,
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diff changeset
135
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diff changeset
136 // Does this parameter support per channel modulations?
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137 CLAP_PARAM_IS_MODULATABLE_PER_CHANNEL = 1 << 13,
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diff changeset
138
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parents:
diff changeset
139 // Does this parameter support per port modulations?
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diff changeset
140 CLAP_PARAM_IS_MODULATABLE_PER_PORT = 1 << 14,
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141
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142 // Any change to this parameter will affect the plugin output and requires to be done via
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parents:
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143 // process() if the plugin is active.
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144 //
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145 // A simple example would be a DC Offset, changing it will change the output signal and must be
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
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146 // processed.
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147 CLAP_PARAM_REQUIRES_PROCESS = 1 << 15,
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148 };
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149 typedef uint32_t clap_param_info_flags;
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150
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parents:
diff changeset
151 /* This describes a parameter */
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parents:
diff changeset
152 typedef struct clap_param_info {
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153 // stable parameter identifier, it must never change.
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154 clap_id id;
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diff changeset
155
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diff changeset
156 clap_param_info_flags flags;
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diff changeset
157
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158 // This value is optional and set by the plugin. The host will
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
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159 // set it on all subsequent events regarding this param_id
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parents:
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160 // or set the cookie to nullptr if the host chooses to
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parents:
diff changeset
161 // not implement cookies.
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parents:
diff changeset
162 //
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parents:
diff changeset
163 // The plugin must gracefully handle the case of a cookie
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parents:
diff changeset
164 // which is nullptr, but can safely assume any cookie
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parents:
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165 // which is not nullptr is the value it issued.
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parents:
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166 //
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parents:
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167 // It is very strongly recommended that the host implement
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
168 // cookies. Some plugins may have noticably reduced
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
169 // performance when addressing params in hosts without cookies.
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170 //
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parents:
diff changeset
171 // The cookie's purpose is to provide a fast access to the
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
172 // plugin parameter objects. For instance:
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parents:
diff changeset
173 //
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parents:
diff changeset
174 // in clap_plugin_params.get_info
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parents:
diff changeset
175 // Parameter *p = findParameter(param_id);
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parents:
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176 // param_info->cookie = p;
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parents:
diff changeset
177 //
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parents:
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178 // later, in clap_plugin.process:
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parents:
diff changeset
179 //
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180 // Parameter *p{nullptr};
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parents:
diff changeset
181 // if (evt->cookie) [[likely]]
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parents:
diff changeset
182 // p = (Parameter *)evt->cookie;
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parents:
diff changeset
183 // else
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parents:
diff changeset
184 // p = -- alternate mechanism --
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parents:
diff changeset
185 //
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parents:
diff changeset
186 // where "alternate mechanism" is a mechanism the plugin implements
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
187 // to map parameter ids to internal objects.
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parents:
diff changeset
188 //
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
189 // The host should make no assumption about the
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
190 // value of the cookie other than passing it back to the plugin or
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prymula <prymula76@outlook.com>
parents:
diff changeset
191 // replacing it with nullptr.
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prymula <prymula76@outlook.com>
parents:
diff changeset
192 //
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parents:
diff changeset
193 // Once set, the cookie is valid until invalidated by a call to
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
194 // clap_host_params->rescan(CLAP_PARAM_RESCAN_ALL) or when the plugin is
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
195 // destroyed.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
196 void *cookie;
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
197
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
198 // the display name
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parents:
diff changeset
199 char name[CLAP_NAME_SIZE];
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
200
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
201 // the module path containing the param, eg:"oscillators/wt1"
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
202 // '/' will be used as a separator to show a tree like structure.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
203 char module[CLAP_PATH_SIZE];
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
204
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
205 double min_value; // minimum plain value
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
206 double max_value; // maximum plain value
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
207 double default_value; // default plain value
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
208 } clap_param_info_t;
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
209
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
210 typedef struct clap_plugin_params {
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
211 // Returns the number of parameters.
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parents:
diff changeset
212 // [main-thread]
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
213 uint32_t(CLAP_ABI *count)(const clap_plugin_t *plugin);
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
214
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
215 // Copies the parameter's info to param_info and returns true on success.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
216 // [main-thread]
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prymula <prymula76@outlook.com>
parents:
diff changeset
217 bool(CLAP_ABI *get_info)(const clap_plugin_t *plugin,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
218 uint32_t param_index,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
219 clap_param_info_t *param_info);
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parents:
diff changeset
220
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
221 // Gets the parameter plain value.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
222 // [main-thread]
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
223 bool(CLAP_ABI *get_value)(const clap_plugin_t *plugin, clap_id param_id, double *value);
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
224
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
225 // Formats the display text for the given parameter value.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
226 // The host should always format the parameter value to text using this function
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
227 // before displaying it to the user.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
228 // [main-thread]
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
229 bool(CLAP_ABI *value_to_text)(
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
230 const clap_plugin_t *plugin, clap_id param_id, double value, char *display, uint32_t size);
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
231
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
232 // Converts the display text to a parameter value.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
233 // [main-thread]
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
234 bool(CLAP_ABI *text_to_value)(const clap_plugin_t *plugin,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
235 clap_id param_id,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
236 const char *display,
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
237 double *value);
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
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238
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239 // Flushes a set of parameter changes.
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240 // This method must not be called concurrently to clap_plugin->process().
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241 //
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242 // Note: if the plugin is processing, then the process() call will already achieve the
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243 // parameter update (bi-directionnal), so a call to flush isn't required, also be aware
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244 // that the plugin may use the sample offset in process(), while this information would be
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245 // lost within flush().
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246 //
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247 // [active ? audio-thread : main-thread]
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248 void(CLAP_ABI *flush)(const clap_plugin_t *plugin,
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249 const clap_input_events_t *in,
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250 const clap_output_events_t *out);
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251 } clap_plugin_params_t;
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252
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253 enum {
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254 // The parameter values did change, eg. after loading a preset.
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255 // The host will scan all the parameters value.
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256 // The host will not record those changes as automation points.
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257 // New values takes effect immediately.
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258 CLAP_PARAM_RESCAN_VALUES = 1 << 0,
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259
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260 // The value to text conversion changed, and the text needs to be rendered again.
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261 CLAP_PARAM_RESCAN_TEXT = 1 << 1,
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262
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263 // The parameter info did change, use this flag for:
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264 // - name change
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265 // - module change
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266 // - is_periodic (flag)
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267 // - is_hidden (flag)
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268 // New info takes effect immediately.
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269 CLAP_PARAM_RESCAN_INFO = 1 << 2,
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270
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271 // Invalidates everything the host knows about parameters.
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272 // It can only be used while the plugin is deactivated.
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273 // If the plugin is activated use clap_host->restart() and delay any change until the host calls
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274 // clap_plugin->deactivate().
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275 //
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276 // You must use this flag if:
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277 // - some parameters were added or removed.
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278 // - some parameters had critical changes:
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279 // - is_per_note (flag)
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280 // - is_per_channel (flag)
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281 // - is_readonly (flag)
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282 // - is_bypass (flag)
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283 // - is_stepped (flag)
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284 // - is_modulatable (flag)
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285 // - min_value
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286 // - max_value
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287 // - cookie
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288 CLAP_PARAM_RESCAN_ALL = 1 << 3,
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289 };
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290 typedef uint32_t clap_param_rescan_flags;
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291
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292 enum {
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293 // Clears all possible references to a parameter
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294 CLAP_PARAM_CLEAR_ALL = 1 << 0,
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295
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296 // Clears all automations to a parameter
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297 CLAP_PARAM_CLEAR_AUTOMATIONS = 1 << 1,
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298
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299 // Clears all modulations to a parameter
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300 CLAP_PARAM_CLEAR_MODULATIONS = 1 << 2,
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301 };
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302 typedef uint32_t clap_param_clear_flags;
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303
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304 typedef struct clap_host_params {
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305 // Rescan the full list of parameters according to the flags.
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306 // [main-thread]
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307 void(CLAP_ABI *rescan)(const clap_host_t *host, clap_param_rescan_flags flags);
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308
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309 // Clears references to a parameter.
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310 // [main-thread]
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311 void(CLAP_ABI *clear)(const clap_host_t *host, clap_id param_id, clap_param_clear_flags flags);
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312
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313 // Request a parameter flush.
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314 //
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315 // The host will then schedule a call to either:
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316 // - clap_plugin.process()
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317 // - clap_plugin_params.flush()
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318 //
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319 // This function is always safe to use and should not be called from an [audio-thread] as the
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320 // plugin would already be within process() or flush().
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321 //
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322 // [thread-safe,!audio-thread]
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323 void(CLAP_ABI *request_flush)(const clap_host_t *host);
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324 } clap_host_params_t;
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325
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326 #ifdef __cplusplus
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327 }
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328 #endif