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
  26 struct cbox_midi_pattern;
  27 struct cbox_track;
  28 struct cbox_song;
  29
  30 /////////////////////////////////////////////////////////////////////////////////////////////////////
  31
  32 struct cbox_midi_playback_active_notes
  33 {
  34     uint16_t channels_active;
  35     uint32_t notes[16][4]; // 0..127
  36 };
  37
  38 extern void cbox_midi_playback_active_notes_init(struct cbox_midi_playback_active_notes *notes);
  39 extern int cbox_midi_playback_active_notes_release(struct cbox_midi_playback_active_notes *notes, struct cbox_midi_buffer *buf);
  40
  41 /////////////////////////////////////////////////////////////////////////////////////////////////////
  42
  43 struct cbox_midi_pattern_playback
  44 {
  45     struct cbox_midi_event *events;
  46     int event_count;
  47 };
  48
  49 /////////////////////////////////////////////////////////////////////////////////////////////////////
  50
  51 struct cbox_midi_clip_playback
  52 {
  53     struct cbox_midi_pattern_playback *pattern;
  54     struct cbox_master *master;
  55
  56     int pos;
  57     int rel_time_samples;
  58     // [start, end) of the pattern slice
  59     int start_time_samples, end_time_samples;
  60     int item_start_ppqn, min_time_ppqn;
  61     int offset_ppqn;
  62     struct cbox_midi_playback_active_notes *active_notes;
  63 };
  64
  65 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);
  66 extern void cbox_midi_clip_playback_render(struct cbox_midi_clip_playback *pb, struct cbox_midi_buffer *buf, int offset, int nsamples);
  67 extern void cbox_midi_clip_playback_seek_ppqn(struct cbox_midi_clip_playback *pb, int time_ppqn, int skip_this_pos);
  68 extern void cbox_midi_clip_playback_seek_samples(struct cbox_midi_clip_playback *pb, int time_samples);
  69 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);
  70
  71 /////////////////////////////////////////////////////////////////////////////////////////////////////
  72
  73 // all times in this structure are in PPQN
  74 struct cbox_track_playback_item
  75 {
  76     uint32_t time;
  77     struct cbox_midi_pattern_playback *pattern;
  78     uint32_t offset;
  79     uint32_t length;
  80     // in future, it should also contain a pre-calculated list of notes to release
  81 };
  82
  83 struct cbox_track_playback
  84 {
  85     struct cbox_track_playback_item *items;
  86     struct cbox_master *master;
  87     int items_count;
  88     int pos;
  89     struct cbox_midi_buffer output_buffer;
  90     struct cbox_midi_clip_playback playback;
  91     struct cbox_midi_playback_active_notes active_notes;
  92 };
  93
  94 extern struct cbox_track_playback *cbox_track_playback_new_from_track(struct cbox_track *track, struct cbox_master *master, struct cbox_song_playback *spb);
  95 extern void cbox_track_playback_render(struct cbox_track_playback *pb, int offset, int nsamples);
  96 extern void cbox_track_playback_seek_ppqn(struct cbox_track_playback *pb, int time_ppqn, int min_time_ppqn);
  97 extern void cbox_track_playback_seek_samples(struct cbox_track_playback *pb, int time_samples);
  98 extern void cbox_track_playback_start_item(struct cbox_track_playback *pb, int time, int is_ppqn, int skip_this_pos);
  99 extern void cbox_track_playback_destroy(struct cbox_track_playback *pb);
 100
 101 /////////////////////////////////////////////////////////////////////////////////////////////////////
 102
 103 struct cbox_tempo_map_item
 104 {
 105     uint32_t time_ppqn;
 106     uint32_t time_samples;
 107     double tempo;
 108     int timesig_nom, timesig_denom;
 109     // should also have a bar/beat position to make things easier
 110 };
 111
 112 /////////////////////////////////////////////////////////////////////////////////////////////////////
 113
 114 struct cbox_song_playback
 115 {
 116     struct cbox_master *master;
 117     struct cbox_track_playback **tracks;
 118     int track_count;
 119     struct cbox_tempo_map_item *tempo_map_items;
 120     int tempo_map_item_count;
 121     int tempo_map_pos;
 122     uint32_t song_pos_samples, song_pos_ppqn, min_time_ppqn;
 123     uint32_t loop_start_ppqn, loop_end_ppqn;
 124     GHashTable *pattern_map;
 125 };
 126
 127 extern struct cbox_song_playback *cbox_song_playback_new(struct cbox_song *song, struct cbox_master *master);
 128 extern void cbox_song_playback_render(struct cbox_song_playback *spb, struct cbox_midi_buffer *output, int nsamples);
 129 extern int cbox_song_playback_active_notes_release(struct cbox_song_playback *spb, struct cbox_midi_buffer *buf);
 130 extern void cbox_song_playback_seek_ppqn(struct cbox_song_playback *spb, int time_ppqn, int skip_this_pos);
 131 extern void cbox_song_playback_seek_samples(struct cbox_song_playback *spb, int time_samples);
 132 extern int cbox_song_playback_tmi_from_ppqn(struct cbox_song_playback *spb, int time_ppqn);
 133 extern int cbox_song_playback_tmi_from_samples(struct cbox_song_playback *spb, int time_samples);
 134 struct cbox_midi_pattern_playback *cbox_song_playback_get_pattern(struct cbox_song_playback *spb, struct cbox_midi_pattern *pattern);
 135 extern void cbox_song_playback_destroy(struct cbox_song_playback *spb);
 136
 137 #endif