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 int cbox_midi_playback_active_notes_release(struct cbox_midi_playback_active_notes *notes, struct cbox_midi_buffer *buf);
  41
  42 /////////////////////////////////////////////////////////////////////////////////////////////////////
  43
  44 struct cbox_midi_pattern_playback
  45 {
  46     struct cbox_midi_event *events;
  47     int event_count;
  48 };
  49
  50 extern void cbox_midi_pattern_playback_destroy(struct cbox_midi_pattern_playback *mppb);
  51
  52 /////////////////////////////////////////////////////////////////////////////////////////////////////
  53
  54 struct cbox_midi_clip_playback
  55 {
  56     struct cbox_midi_pattern_playback *pattern;
  57     struct cbox_master *master;
  58
  59     int pos;
  60     int rel_time_samples;
  61     // [start, end) of the pattern slice
  62     int start_time_samples, end_time_samples;
  63     int item_start_ppqn, min_time_ppqn;
  64     int offset_ppqn;
  65     struct cbox_midi_playback_active_notes *active_notes;
  66 };
  67
  68 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);
  69 extern void cbox_midi_clip_playback_render(struct cbox_midi_clip_playback *pb, struct cbox_midi_buffer *buf, int offset, int nsamples);
  70 extern void cbox_midi_clip_playback_seek_ppqn(struct cbox_midi_clip_playback *pb, int time_ppqn, int skip_this_pos);
  71 extern void cbox_midi_clip_playback_seek_samples(struct cbox_midi_clip_playback *pb, int time_samples);
  72 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);
  73
  74 /////////////////////////////////////////////////////////////////////////////////////////////////////
  75
  76 // all times in this structure are in PPQN
  77 struct cbox_track_playback_item
  78 {
  79     uint32_t time;
  80     struct cbox_midi_pattern_playback *pattern;
  81     uint32_t offset;
  82     uint32_t length;
  83     // in future, it should also contain a pre-calculated list of notes to release
  84 };
  85
  86 struct cbox_track_playback
  87 {
  88     struct cbox_track_playback_item *items;
  89     struct cbox_master *master;
  90     int items_count;
  91     int pos;
  92     struct cbox_midi_buffer output_buffer;
  93     struct cbox_midi_clip_playback playback;
  94     struct cbox_midi_playback_active_notes active_notes;
  95     struct cbox_midi_merger *external_merger;
  96     struct cbox_song_playback *spb;
  97 };
  98
  99 extern struct cbox_track_playback *cbox_track_playback_new_from_track(struct cbox_track *track, struct cbox_master *master, struct cbox_song_playback *spb);
 100 extern void cbox_track_playback_render(struct cbox_track_playback *pb, int offset, int nsamples);
 101 extern void cbox_track_playback_seek_ppqn(struct cbox_track_playback *pb, int time_ppqn, int min_time_ppqn);
 102 extern void cbox_track_playback_seek_samples(struct cbox_track_playback *pb, int time_samples);
 103 extern void cbox_track_playback_start_item(struct cbox_track_playback *pb, int time, int is_ppqn, int skip_this_pos);
 104 extern void cbox_track_playback_destroy(struct cbox_track_playback *pb);
 105
 106 /////////////////////////////////////////////////////////////////////////////////////////////////////
 107
 108 struct cbox_tempo_map_item
 109 {
 110     uint32_t time_ppqn;
 111     uint32_t time_samples;
 112     double tempo;
 113     int timesig_nom, timesig_denom;
 114     // should also have a bar/beat position to make things easier
 115 };
 116
 117 /////////////////////////////////////////////////////////////////////////////////////////////////////
 118
 119 struct cbox_song_playback
 120 {
 121     struct cbox_master *master;
 122     struct cbox_track_playback **tracks;
 123     int track_count;
 124     struct cbox_tempo_map_item *tempo_map_items;
 125     int tempo_map_item_count;
 126     int tempo_map_pos;
 127     uint32_t song_pos_samples, song_pos_ppqn, min_time_ppqn;
 128     uint32_t loop_start_ppqn, loop_end_ppqn;
 129     GHashTable *pattern_map;
 130     struct cbox_midi_merger track_merger;
 131     struct cbox_rt *rt;
 132 };
 133
 134 extern struct cbox_song_playback *cbox_song_playback_new(struct cbox_song *song, struct cbox_master *master, struct cbox_rt *rt);
 135 extern void cbox_song_playback_render(struct cbox_song_playback *spb, struct cbox_midi_buffer *output, int nsamples);
 136 extern int cbox_song_playback_active_notes_release(struct cbox_song_playback *spb, struct cbox_midi_buffer *buf);
 137 extern void cbox_song_playback_seek_ppqn(struct cbox_song_playback *spb, int time_ppqn, int skip_this_pos);
 138 extern void cbox_song_playback_seek_samples(struct cbox_song_playback *spb, int time_samples);
 139 extern int cbox_song_playback_tmi_from_ppqn(struct cbox_song_playback *spb, int time_ppqn);
 140 extern int cbox_song_playback_tmi_from_samples(struct cbox_song_playback *spb, int time_samples);
 141 struct cbox_midi_pattern_playback *cbox_song_playback_get_pattern(struct cbox_song_playback *spb, struct cbox_midi_pattern *pattern);
 142 extern void cbox_song_playback_destroy(struct cbox_song_playback *spb);
 143
 144 #endif