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199
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1 /*
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2
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3 TiMidity -- Experimental MIDI to WAVE converter
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4 Copyright (C) 1995 Tuukka Toivonen <toivonen@clinet.fi>
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5
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6 This program is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2 of the License, or
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9 (at your option) any later version.
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10
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11 This program is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with this program; if not, write to the Free Software
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18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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19
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20 */
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21
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22 typedef Sint16 sample_t;
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23 typedef Sint32 final_volume_t;
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24
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25 #define VIBRATO_SAMPLE_INCREMENTS 32
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26
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27 /* Maximum polyphony. */
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28 #define MAX_VOICES 48
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29
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30 typedef struct {
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31 Sint32
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32 loop_start, loop_end, data_length,
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33 sample_rate, low_freq, high_freq, root_freq;
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34 Sint32
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35 envelope_rate[6], envelope_offset[6];
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36 float
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37 volume;
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38 sample_t *data;
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39 Sint32
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40 tremolo_sweep_increment, tremolo_phase_increment,
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41 vibrato_sweep_increment, vibrato_control_ratio;
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42 Uint8
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43 tremolo_depth, vibrato_depth,
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44 modes;
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45 Sint8
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46 panning, note_to_use;
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47 } Sample;
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48
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49 typedef struct {
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50 int
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51 bank, program, volume, sustain, panning, pitchbend, expression,
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52 mono, /* one note only on this channel -- not implemented yet */
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53 pitchsens;
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54 /* chorus, reverb... Coming soon to a 300-MHz, eight-way superscalar
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55 processor near you */
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56 float
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57 pitchfactor; /* precomputed pitch bend factor to save some fdiv's */
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58 } Channel;
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59
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60 typedef struct {
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61 Uint8
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62 status, channel, note, velocity;
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63 Sample *sample;
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64 Sint32
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65 orig_frequency, frequency,
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66 sample_offset, sample_increment,
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67 envelope_volume, envelope_target, envelope_increment,
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68 tremolo_sweep, tremolo_sweep_position,
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69 tremolo_phase, tremolo_phase_increment,
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70 vibrato_sweep, vibrato_sweep_position;
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71
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72 final_volume_t left_mix, right_mix;
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73
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74 float
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75 left_amp, right_amp, tremolo_volume;
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76 Sint32
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77 vibrato_sample_increment[VIBRATO_SAMPLE_INCREMENTS];
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78 int
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79 vibrato_phase, vibrato_control_ratio, vibrato_control_counter,
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80 envelope_stage, control_counter, panning, panned;
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81
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82 } Voice;
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83
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84 typedef struct {
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85 int samples;
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86 Sample *sample;
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87 } Instrument;
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88
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89 /* Shared data */
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90 typedef struct {
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91 char *name;
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92 int note, amp, pan, strip_loop, strip_envelope, strip_tail;
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93 } ToneBankElement;
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94
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95 typedef struct {
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96 ToneBankElement *tone;
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97 Instrument *instrument[128];
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98 } ToneBank;
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99
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100 typedef struct {
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101 Sint32 time;
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102 Uint8 channel, type, a, b;
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103 } MidiEvent;
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104
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105 typedef struct {
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106 MidiEvent event;
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107 void *next;
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108 } MidiEventList;
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109
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110 typedef struct {
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111 int playing;
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112 SDL_RWops *rw;
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113 Sint32 rate;
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114 Sint32 encoding;
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115 float master_volume;
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116 Sint32 amplification;
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117 ToneBank *tonebank[128];
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118 ToneBank *drumset[128];
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119 Instrument *default_instrument;
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120 int default_program;
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121 void (*write)(void *dp, Sint32 *lp, Sint32 c);
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122 int buffer_size;
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123 sample_t *resample_buffer;
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124 Sint32 *common_buffer;
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125 Sint32 *buffer_pointer;
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126 /* These would both fit into 32 bits, but they are often added in
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127 large multiples, so it's simpler to have two roomy ints */
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128 /* samples per MIDI delta-t */
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129 Sint32 sample_increment;
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130 Sint32 sample_correction;
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131 Channel channel[16];
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132 Voice voice[MAX_VOICES];
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133 int voices;
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134 Sint32 drumchannels;
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135 Sint32 buffered_count;
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136 Sint32 control_ratio;
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137 Sint32 lost_notes;
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138 Sint32 cut_notes;
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139 Sint32 samples;
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140 MidiEvent *events;
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141 MidiEvent *current_event;
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142 MidiEventList *evlist;
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143 Sint32 current_sample;
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144 Sint32 event_count;
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145 Sint32 at;
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146 } MidiSong;
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147
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148 /* Some of these are not defined in timidity.c but are here for convenience */
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149
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150 extern int Timidity_Init(void);
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151 extern void Timidity_SetVolume(MidiSong *song, int volume);
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152 extern int Timidity_PlaySome(MidiSong *song, void *stream, Sint32 len);
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153 extern MidiSong *Timidity_LoadSong(SDL_RWops *rw, SDL_AudioSpec *audio);
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154 extern void Timidity_Start(MidiSong *song);
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155 extern void Timidity_FreeSong(MidiSong *song);
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156 extern void Timidity_Exit(void);
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