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/****************************************************************************
lv2-midifunctions.h - support file for using MIDI in LV2 plugins
Copyright (C) 2006 Lars Luthman <lars.luthman@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 01222-1307 USA
****************************************************************************/
#ifndef LV2_MIDIFUNCTIONS
#define LV2_MIDIFUNCTIONS
#include "lv2-miditype.h"
#ifdef __cplusplus
extern "C" {
#endif
typedef struct {
LV2_MIDI* midi;
uint32_t frame_count;
uint32_t position;
} LV2_MIDIState;
inline double lv2midi_get_event(LV2_MIDIState* state,
double* timestamp,
uint32_t* size,
unsigned char** data) {
if (state->position >= state->midi->size) {
state->position = state->midi->size;
*timestamp = state->frame_count;
*size = 0;
*data = NULL;
return *timestamp;
}
*timestamp = *(double*)(state->midi->data + state->position);
*size = (uint32_t)*(size_t*)(state->midi->data + state->position + sizeof(double));
*data = state->midi->data + state->position +
sizeof(double) + sizeof(size_t);
return *timestamp;
}
inline double lv2midi_step(LV2_MIDIState* state) {
if (state->position >= state->midi->size) {
state->position = state->midi->size;
return state->frame_count;
}
state->position += (uint32_t)sizeof(double);
size_t size = *(size_t*)(state->midi->data + state->position);
state->position += (uint32_t)sizeof(size_t);
state->position += (uint32_t)size;
return *(double*)(state->midi->data + state->position);
}
inline void lv2midi_put_event(LV2_MIDIState* state,
double timestamp,
uint32_t size,
const unsigned char* data) {
if (state->midi->size + sizeof(double) + sizeof(size_t) + size < state->midi->capacity)
{
*((double*)(state->midi->data + state->midi->size)) = timestamp;
state->midi->size += (uint32_t)sizeof(double);
*((size_t*)(state->midi->data + state->midi->size)) = size;
state->midi->size += (uint32_t)sizeof(size_t);
memcpy(state->midi->data + state->midi->size, data, size);
state->midi->size += size;
state->midi->event_count++;
}
}
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif
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