/* LV2 Contexts Extension * Copyright (C) 2007-2009 David Robillard * * 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 * . */ #ifndef LV2_CONTEXTS_H #define LV2_CONTEXTS_H #include #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 */ ntent' class='blob'>