seq.h

   1 /*
   2 Calf Box, an open source musical instrument.
   3 Copyright (C) 2010-2011 Krzysztof Foltman
   4
   5 This program is free software: you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation, either version 3 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 #ifndef CBOX_SEQ_H
  20 #define CBOX_SEQ_H
  21
  22 #include <stdint.h>
  23
  24 #include "midi.h"
  25 #include "mididest.h"
  26
  27 struct cbox_midi_pattern;
  28 struct cbox_track;
  29 struct cbox_song;
  30
  31 /////////////////////////////////////////////////////////////////////////////////////////////////////
  32
  33 struct cbox_midi_playback_active_notes
  34 {
  35     uint16_t channels_active;
  36     uint32_t notes[16][4]; // 0..127
  37 };
  38
  39 extern void cbox_midi_playback_active_notes_init(struct cbox_midi_playback_active_notes *notes);
  40 extern void cbox_midi_playback_active_notes_copy(struct cbox_midi_playback_active_notes *dest, const struct cbox_midi_playback_active_notes *src);
  41 extern void cbox_midi_playback_active_notes_clear(struct cbox_midi_playback_active_notes *notes);
  42 extern int cbox_midi_playback_active_notes_release(struct cbox_midi_playback_active_notes *notes, struct cbox_midi_buffer *buf);
  43
  44 /////////////////////////////////////////////////////////////////////////////////////////////////////
  45
  46 struct cbox_midi_pattern_playback
  47 {
  48     struct cbox_midi_event *events;
  49     int event_count;
  50 };
  51
  52 extern void cbox_midi_pattern_playback_destroy(struct cbox_midi_pattern_playback *mppb);
  53
  54 /////////////////////////////////////////////////////////////////////////////////////////////////////
  55
  56 struct cbox_midi_clip_playback
  57 {
  58     struct cbox_midi_pattern_playback *pattern;
  59     struct cbox_master *master;
  60
  61     int pos;
  62     int rel_time_samples;
  63     // [start, end) of the pattern slice
  64     int start_time_samples, end_time_samples;
  65     int item_start_ppqn, min_time_ppqn;
  66     int offset_ppqn;
  67     struct cbox_midi_playback_active_notes *active_notes;
  68 };
  69
  70 extern void cbox_midi_clip_playback_init(struct cbox_midi_clip_playback *pb, struct cbox_midi_playback_active_notes *active_notes, struct cbox_master *master);
  71 extern void cbox_midi_clip_playback_render(struct cbox_midi_clip_playback *pb, struct cbox_midi_buffer *buf, int offset, int nsamples);
  72 extern void cbox_midi_clip_playback_seek_ppqn(struct cbox_midi_clip_playback *pb, int time_ppqn, int skip_this_pos);
  73 extern void cbox_midi_clip_playback_seek_samples(struct cbox_midi_clip_playback *pb, int time_samples);
  74 extern void cbox_midi_clip_playback_set_pattern(struct cbox_midi_clip_playback *pb, struct cbox_midi_pattern_playback *pattern, int start_time_samples, int end_time_samples, int item_start_ppqn, int offset_ppqn);
  75
  76 /////////////////////////////////////////////////////////////////////////////////////////////////////
  77
  78 // all times in this structure are in PPQN
  79 struct cbox_track_playback_item
  80 {
  81     uint32_t time;
  82     struct cbox_midi_pattern_playback *pattern;
  83     uint32_t offset;
  84     uint32_t length;
  85     // in future, it should also contain a pre-calculated list of notes to release
  86 };
  87
  88 struct cbox_track_playback
  89 {
  90     struct cbox_track *track; // used as identification only
  91     struct cbox_track_playback_item *items;
  92     struct cbox_master *master;
  93     int items_count;
  94     int pos;
  95     struct cbox_midi_buffer output_buffer;
  96     struct cbox_midi_clip_playback playback;
  97     struct cbox_midi_playback_active_notes active_notes;
  98     struct cbox_midi_merger *external_merger;
  99     struct cbox_song_playback *spb;
 100     struct cbox_track_playback *old_state;
 101     gboolean state_copied;
 102 };
 103
 104 extern struct cbox_track_playback *cbox_track_playback_new_from_track(struct cbox_track *track, struct cbox_master *master, struct cbox_song_playback *spb, struct cbox_track_playback *old_state);
 105 extern void cbox_track_playback_render(struct cbox_track_playback *pb, int offset, int nsamples);
 106 extern void cbox_track_playback_seek_ppqn(struct cbox_track_playback *pb, int time_ppqn, int min_time_ppqn);
 107 extern void cbox_track_playback_seek_samples(struct cbox_track_playback *pb, int time_samples);
 108 extern void cbox_track_playback_start_item(struct cbox_track_playback *pb, int time, int is_ppqn, int skip_this_pos);
 109 extern void cbox_track_playback_destroy(struct cbox_track_playback *pb);
 110
 111 /////////////////////////////////////////////////////////////////////////////////////////////////////
 112
 113 struct cbox_tempo_map_item
 114 {
 115     uint32_t time_ppqn;
 116     uint32_t time_samples;
 117     double tempo;
 118     int timesig_nom, timesig_denom;
 119     // should also have a bar/beat position to make things easier
 120 };
 121
 122 /////////////////////////////////////////////////////////////////////////////////////////////////////
 123
 124 struct cbox_song_playback
 125 {
 126     struct cbox_master *master;
 127     struct cbox_song *song; // for identification only
 128     struct cbox_track_playback **tracks;
 129     int track_count;
 130     struct cbox_tempo_map_item *tempo_map_items;
 131     int tempo_map_item_count;
 132     int tempo_map_pos;
 133     uint32_t song_pos_samples, song_pos_ppqn, min_time_ppqn;
 134     uint32_t loop_start_ppqn, loop_end_ppqn;
 135     GHashTable *pattern_map;
 136     struct cbox_midi_merger track_merger;
 137     struct cbox_engine *engine;
 138 };
 139
 140 extern struct cbox_song_playback *cbox_song_playback_new(struct cbox_song *song, struct cbox_master *master, struct cbox_engine *engine, struct cbox_song_playback *old_state);
 141 extern void cbox_song_playback_render(struct cbox_song_playback *spb, struct cbox_midi_buffer *output, int nsamples);
 142 extern int cbox_song_playback_active_notes_release(struct cbox_song_playback *spb, struct cbox_midi_buffer *buf);
 143 extern void cbox_song_playback_seek_ppqn(struct cbox_song_playback *spb, int time_ppqn, int skip_this_pos);
 144 extern void cbox_song_playback_seek_samples(struct cbox_song_playback *spb, int time_samples);
 145 extern int cbox_song_playback_tmi_from_ppqn(struct cbox_song_playback *spb, int time_ppqn);
 146 extern int cbox_song_playback_tmi_from_samples(struct cbox_song_playback *spb, int time_samples);
 147 struct cbox_midi_pattern_playback *cbox_song_playback_get_pattern(struct cbox_song_playback *spb, struct cbox_midi_pattern *pattern);
 148 extern void cbox_song_playback_apply_old_state(struct cbox_song_playback *spb);
 149 extern void cbox_song_playback_destroy(struct cbox_song_playback *spb);
 150
 151 #endif