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Diffstat (limited to 'hosts/lv2-midifunctions.h')
| -rw-r--r-- | hosts/lv2-midifunctions.h | 161 |
1 files changed, 0 insertions, 161 deletions
diff --git a/hosts/lv2-midifunctions.h b/hosts/lv2-midifunctions.h deleted file mode 100644 index 3a17395..0000000 --- a/hosts/lv2-midifunctions.h +++ /dev/null @@ -1,161 +0,0 @@ -/**************************************************************************** - - 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 Lesser 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 <string.h> - -#include "lv2-miditype.h" - - -/** This structure contains information about a MIDI port buffer, the - current period size, and the position in the MIDI data buffer that - we are currently reading from or writing to. It needs to be recreated - or at least reinitialised every process() call. */ -typedef struct { - - /** The MIDI port structure that we want to read or write. */ - LV2_MIDI* midi; - - /** The number of frames in this process cycle. */ - uint32_t frame_count; - - /** The current position in the data buffer. Should be initialised to 0. */ - uint32_t position; - -} LV2_MIDIState; - - -static LV2_MIDI* lv2midi_new(uint32_t capacity) -{ - LV2_MIDI* midi = malloc(sizeof(LV2_MIDI)); - - midi->event_count = 0; - midi->capacity = capacity; - midi->size = 0; - midi->data = malloc(sizeof(char) * capacity); - - return midi; -} - - -static void lv2midi_free(LV2_MIDI* midi) -{ - free(midi->data); - free(midi); -} - - -static void lv2midi_reset_buffer(LV2_MIDI* midi) -{ - midi->event_count = 0; - midi->size = 0; -} - -static void lv2midi_reset_state(LV2_MIDIState* state, LV2_MIDI* midi, uint32_t frame_count) -{ - state->midi = midi; - state->frame_count = frame_count; - state->position = 0; -} - - -/** This function advances the read/write position in @c state to the next - event and returns its timestamp, or the @c frame_count member of @c state - is there are no more events. */ -static double lv2midi_increment(LV2_MIDIState* state) { - - if (state->position + sizeof(double) + sizeof(size_t) >= state->midi->size) { - state->position = state->midi->size; - return state->frame_count; - } - - state->position += sizeof(double); - size_t size = *(size_t*)(state->midi->data + state->position); - state->position += sizeof(size_t); - state->position += size; - - if (state->position >= state->midi->size) - return state->frame_count; - - return *(double*)(state->midi->data + state->position); -} - - -/** This function reads one event from the port associated with the @c state - parameter and writes its timestamp, size and a pointer to its data bytes - into the parameters @c timestamp, @c size and @c data, respectively. - It does not advance the read position in the MIDI data buffer, two - subsequent calls to lv2midi_get_event() will read the same event. - - The function returns the timestamp for the read event, or the @c frame_count - member of @c state if there are no more events in the buffer. */ -static 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 = *(size_t*)(state->midi->data + state->position + sizeof(double)); - *data = state->midi->data + state->position + - sizeof(double) + sizeof(size_t); - return *timestamp; -} - - -/** This function writes one MIDI event to the port buffer associated with - @c state. It returns 0 when the event was written successfully to the - buffer, and -1 when there was not enough room. The read/write position - is advanced automatically. */ -static int lv2midi_put_event(LV2_MIDIState* state, - double timestamp, - uint32_t size, - const unsigned char* data) { - - if (state->midi->capacity - state->midi->size < - sizeof(double) + sizeof(size_t) + size) - return -1; - - *(double*)(state->midi->data + state->midi->size) = timestamp; - state->midi->size += sizeof(double); - *(size_t*)(state->midi->data + state->midi->size) = size; - state->midi->size += sizeof(size_t); - memcpy(state->midi->data + state->midi->size, data, (size_t)size); - state->midi->size += size; - - ++state->midi->event_count; - - return 0; -} - - -#endif - |