src/calf/lv2_contexts.h

   1 /* LV2 OSC Messages Extension
   2  * Copyright (C) 2007-2008 Dave Robillard <dave@drobilla.net>
   3  *
   4  * This header is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the Free
   6  * Software Foundation; either version 2 of the License, or (at your option)
   7  * any later version.
   8  *
   9  * This header is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #ifndef LV2_CONTEXTS_H
  20 #define LV2_CONTEXTS_H
  21
  22 #include <stdint.h>
  23
  24 #define LV2_CONTEXTS_URI "http://lv2plug.in/ns/dev/contexts"
  25
  26 #define LV2_CONTEXT_MESSAGE "http://lv2plug.in/ns/dev/contexts#MessageContext"
  27
  28 static inline void
  29 lv2_contexts_set_port_valid(void* flags, uint32_t index) {
  30         ((uint8_t*)flags)[index / 8] |= 1 << (index % 8);
  31 }
  32
  33 static inline void
  34 lv2_contexts_unset_port_valid(void* flags, uint32_t index) {
  35         ((uint8_t*)flags)[index / 8] &= ~(1 << (index % 8));
  36 }
  37
  38 static inline int
  39 lv2_contexts_port_is_valid(const void* flags, uint32_t index) {
  40         return (((uint8_t*)flags)[index / 8] & (1 << (index % 8))) != 0;
  41 }
  42
  43 #include "lv2.h"
  44 #include <stdbool.h>
  45
  46
  47 typedef struct {
  48         /** The message run function.  This is called once to process a set of
  49          * inputs and produce a set of outputs.  Before calling the host MUST
  50          * set valid_inputs such that the bit corresponding to each input port
  51          * is 1 iff data is present.  The plugin MUST only inspect bits
  52          * corresponding to ports in the message thread.  Before returning the
  53          * plugin MUST set valid_outputs such that the bit corresponding to
  54          * each output port of the message context is 1 iff data has been written
  55          * to that port in the duration of this function invocation.
  56          * The plugin must return 1 if outputs have been written, 0 otherwise.
  57          */
  58         uint32_t (*message_run)(LV2_Handle  instance,
  59                                 const void* valid_inputs,
  60                                 void*       valid_outputs);
  61
  62         /** The message thread function alalogous to the LV2 connect_port
  63          * function.  This function must only be used to connect ports that
  64          * belong to the message context. */
  65         void (*message_connect_port)(LV2_Handle instance,
  66                                      uint32_t   port,
  67                                      void*      data);
  68
  69 } LV2MessageContext;
  70
  71
  72 #endif // LV2_CONTEXTS_H
  73