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/* LV2 Contexts Extension
* Copyright (C) 2007-2009 David Robillard <http://drobilla.net>
*
* This header is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This header is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/** @file
* C header for the LV2 Contexts extension
* <http://lv2plug.in/ns/ext/contexts>.
*/
#ifndef LV2_CONTEXTS_H
#define LV2_CONTEXTS_H
#include <stdint.h>
#include "lv2/lv2plug.in/ns/lv2core/lv2.h"
#define LV2_CONTEXTS_URI "http://lv2plug.in/ns/ext/contexts"
static inline void
lv2_contexts_set_port_valid(void* flags, uint32_t index) {
((uint8_t*)flags)[index / 8] |= 1 << (index % 8);
}
static inline void
lv2_contexts_unset_port_valid(void* flags, uint32_t index) {
((uint8_t*)flags)[index / 8] &= ~(1 << (index % 8));
}
static inline int
lv2_contexts_port_is_valid(const void* flags, uint32_t index) {
return (((uint8_t*)flags)[index / 8] & (1 << (index % 8))) != 0;
}
typedef struct {
/** The message run function. This is called once to process a set of
* inputs and produce a set of outputs.
*
* Before calling the host MUST set valid_inputs such that the bit
* corresponding to each input port is 1 iff data is present. The plugin
* MUST only inspect bits corresponding to ports in the message thread.
*
* Similarly, before returning the plugin MUST set valid_outputs such that
* the bit corresponding to each output port of the message context is 1
* iff the value at that port has changed.
* The plugin must return 1 if outputs have been written, 0 otherwise.
*/
uint32_t (*run)(LV2_Handle instance,
const void* valid_inputs,
void* valid_outputs);
} LV2_Contexts_MessageContext;
typedef void* LV2_Contexts_Request_Run_Data;
typedef struct {
/** Pointer to opaque host data (to be passed to request_run) */
LV2_Contexts_Request_Run_Data data;
/** Request the host execute the context with the given URI */
void (*request_run)(LV2_Contexts_Request_Run_Data host_handle,
uint32_t context_uri);
} LV2_Contexts_Request_Run_Feature;
#endif /* LV2_CONTEXTS_H */
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