diff options
Diffstat (limited to 'drumgizmo/input/midifile/midifile.cc')
| -rw-r--r-- | drumgizmo/input/midifile/midifile.cc | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/drumgizmo/input/midifile/midifile.cc b/drumgizmo/input/midifile/midifile.cc new file mode 100644 index 0000000..7b17028 --- /dev/null +++ b/drumgizmo/input/midifile/midifile.cc @@ -0,0 +1,235 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/*************************************************************************** + * dummy.cc + * + * Sat Apr 30 21:11:54 CEST 2011 + * Copyright 2011 Bent Bisballe Nyeng + * deva@aasimon.org + ****************************************************************************/ + +/* + * This file is part of DrumGizmo. + * + * DrumGizmo 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. + * + * DrumGizmo 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 DrumGizmo; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + */ +#include <stdlib.h> + +#include <string> +#include <event.h> + +#include <smf.h> + +#include "midimap.h" + +#define NOTE_ON 0x90 + +class MidiFile { +public: + MidiFile(); + ~MidiFile() {} + + bool init(int instruments, char *inames[]); + + void setParm(std::string parm, std::string value); + + bool start(); + void stop(); + + void pre(); + event_t *run(size_t pos, size_t len, size_t *nevents); + void post(); + +private: + smf_t *smf; + smf_event_t *cur_event; + + MidiMap mmap; + + // Parameters + std::string filename; + float speed; + int track; + std::string midimapfile; +}; + +MidiFile::MidiFile() +{ + cur_event = NULL; + smf = NULL; + + filename = ""; + speed = 1.0; + track = 0; +} + +bool MidiFile::init(int instruments, char *inames[]) +{ + smf = smf_load(filename.c_str()); + + mmap.load(midimapfile); + + return true; +} + +void MidiFile::setParm(std::string parm, std::string value) +{ + if(parm == "file") filename = value; + if(parm == "speed") speed = atof(value.c_str()); + if(parm == "track") track = atoi(value.c_str()); + if(parm == "midimap") midimapfile = value; +} + +bool MidiFile::start() +{ + return true; +} + +void MidiFile::stop() +{ +} + +void MidiFile::pre() +{ +} + +event_t *MidiFile::run(size_t pos, size_t len, size_t *nevents) +{ + event_t *evs = NULL; + size_t nevs = 0; + + double cur_max_time = (double)(pos + len) / (44100.0 / speed); + // double cur_min_time = (double)(pos) / (44100.0 / speed); + + if(!cur_event) cur_event = smf_get_next_event(smf); + + while(cur_event && cur_event->time_seconds < cur_max_time) { + if(!smf_event_is_metadata(cur_event)) { + if( (cur_event->midi_buffer_length == 3) && + ((cur_event->midi_buffer[0] & NOTE_ON) == NOTE_ON) && + cur_event->track_number == track && cur_event->midi_buffer[2] > 0) { + + if(evs == NULL) evs = (event_t *)malloc(sizeof(event_t) * 1000); + + int key = cur_event->midi_buffer[1]; + int velocity = cur_event->midi_buffer[2]; + + evs[nevs].type = TYPE_ONSET; + size_t evpos = cur_event->time_seconds * (44100.0 / speed); + evs[nevs].offset = evpos - pos; + /* + printf("evpos: %d, sec: %f, pos: %d, len: %d, max_time: %f\n", + evpos, cur_event->time_seconds, pos, len, cur_max_time); + */ + evs[nevs].instrument = mmap.lookup(key); + evs[nevs].velocity = velocity / 127.0; + + nevs++; + if(nevs > 999) { + printf("PANIC!\n"); + break; + } + } + } + + cur_event = smf_get_next_event(smf); + } + + if(!cur_event) { + if(evs == NULL) evs = (event_t *)malloc(sizeof(event_t) * 1000); + evs[nevs].type = TYPE_STOP; + evs[nevs].offset = len - 1; + nevs++; + } + + *nevents = nevs; + + return evs; +} + +void MidiFile::post() +{ +} + +extern "C" { + void *create() + { + return new MidiFile(); + } + + void destroy(void *h) + { + MidiFile *midifile = (MidiFile*)h; + delete midifile; + } + + bool init(void *h, int i, char *inames[]) + { + MidiFile *midifile = (MidiFile*)h; + return midifile->init(i, inames); + } + + void setparm(void *h, const char *parm, const char *value) + { + MidiFile *midifile = (MidiFile*)h; + midifile->setParm(parm, value); + } + + bool start(void *h) + { + MidiFile *midifile = (MidiFile*)h; + return midifile->start(); + } + + void stop(void *h) + { + MidiFile *midifile = (MidiFile*)h; + midifile->stop(); + } + + void pre(void *h) + { + MidiFile *midifile = (MidiFile*)h; + midifile->pre(); + } + + event_t *run(void *h, size_t pos, size_t len, size_t *nev) + { + MidiFile *midifile = (MidiFile*)h; + return midifile->run(pos, len, nev); + } + + void post(void *h) + { + MidiFile *midifile = (MidiFile*)h; + midifile->post(); + } +} + +#ifdef TEST_AUDIOINPUTENGINEMIDIFILE +//Additional dependency files +//deps: +//Required cflags (autoconf vars may be used) +//cflags: +//Required link options (autoconf vars may be used) +//libs: +#include "test.h" + +TEST_BEGIN; + +// TODO: Put some testcode here (see test.h for usable macros). + +TEST_END; + +#endif/*TEST_AUDIOINPUTENGINEMIDIFILE*/ |