source/native-plugins/midi-through.c

   1 /*
   2  * Carla Native Plugins
   3  * Copyright (C) 2012-2019 Filipe Coelho <falktx@falktx.com>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation; either version 2 of
   8  * the License, or any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * For a full copy of the GNU General Public License see the doc/GPL.txt file.
  16  */
  17
  18 #include "CarlaNative.h"
  19 #include "CarlaMIDI.h"
  20
  21 #include <stdlib.h>
  22
  23 // -----------------------------------------------------------------------
  24
  25 typedef struct {
  26     const NativeHostDescriptor* host;
  27 } MidiThroughHandle;
  28
  29 // -----------------------------------------------------------------------
  30
  31 static NativePluginHandle midithrough_instantiate(const NativeHostDescriptor* host)
  32 {
  33     MidiThroughHandle* const handle = (MidiThroughHandle*)malloc(sizeof(MidiThroughHandle));
  34
  35     if (handle == NULL)
  36         return NULL;
  37
  38     handle->host = host;
  39     return handle;
  40 }
  41
  42 #define handlePtr ((MidiThroughHandle*)handle)
  43
  44 static void midithrough_cleanup(NativePluginHandle handle)
  45 {
  46     free(handlePtr);
  47 }
  48
  49 // FIXME for v3.0, use const for the input buffer
  50 static void midithrough_process(NativePluginHandle handle,
  51                                 float** inBuffer, float** outBuffer, uint32_t frames,
  52                                 const NativeMidiEvent* midiEvents, uint32_t midiEventCount)
  53 {
  54     const NativeHostDescriptor* const host = handlePtr->host;
  55
  56     for (uint32_t i=0; i < midiEventCount; ++i)
  57         host->write_midi_event(host->handle, &midiEvents[i]);
  58
  59     return;
  60
  61     // unused
  62     (void)inBuffer;
  63     (void)outBuffer;
  64     (void)frames;
  65 }
  66
  67 #undef handlePtr
  68
  69 // -----------------------------------------------------------------------
  70
  71 static const NativePluginDescriptor midithroughDesc = {
  72     .category  = NATIVE_PLUGIN_CATEGORY_UTILITY,
  73     .hints     = NATIVE_PLUGIN_IS_RTSAFE,
  74     .supports  = NATIVE_PLUGIN_SUPPORTS_EVERYTHING,
  75     .audioIns  = 0,
  76     .audioOuts = 0,
  77     .cvIns     = 0,
  78     .cvOuts    = 0,
  79     .midiIns   = 1,
  80     .midiOuts  = 1,
  81     .paramIns  = 0,
  82     .paramOuts = 0,
  83     .name      = "MIDI Through",
  84     .label     = "midithrough",
  85     .maker     = "falkTX",
  86     .copyright = "GNU GPL v2+",
  87
  88     .instantiate = midithrough_instantiate,
  89     .cleanup     = midithrough_cleanup,
  90
  91     .get_parameter_count = NULL,
  92     .get_parameter_info  = NULL,
  93     .get_parameter_value = NULL,
  94
  95     .get_midi_program_count = NULL,
  96     .get_midi_program_info  = NULL,
  97
  98     .set_parameter_value = NULL,
  99     .set_midi_program    = NULL,
 100     .set_custom_data     = NULL,
 101
 102     .ui_show = NULL,
 103     .ui_idle = NULL,
 104
 105     .ui_set_parameter_value = NULL,
 106     .ui_set_midi_program    = NULL,
 107     .ui_set_custom_data     = NULL,
 108
 109     .activate   = NULL,
 110     .deactivate = NULL,
 111     .process    = midithrough_process,
 112
 113     .get_state = NULL,
 114     .set_state = NULL,
 115
 116     .dispatcher = NULL
 117 };
 118
 119 // -----------------------------------------------------------------------
 120
 121 void carla_register_native_plugin_midithrough(void);
 122
 123 void carla_register_native_plugin_midithrough(void)
 124 {
 125     carla_register_native_plugin(&midithroughDesc);
 126 }
 127
 128 // -----------------------------------------------------------------------