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comparison decoders/timidity/timidity.h @ 199:2d887640d300

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Initial add.
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 04 Jan 2002 06:49:49 +0000
parents
children 498240aa76f1
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198:f9a752f41ab6 199:2d887640d300
1 /*
2
3 TiMidity -- Experimental MIDI to WAVE converter
4 Copyright (C) 1995 Tuukka Toivonen <toivonen@clinet.fi>
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19
20 */
21
22 typedef Sint16 sample_t;
23 typedef Sint32 final_volume_t;
24
25 #define VIBRATO_SAMPLE_INCREMENTS 32
26
27 /* Maximum polyphony. */
28 #define MAX_VOICES 48
29
30 typedef struct {
31 Sint32
32 loop_start, loop_end, data_length,
33 sample_rate, low_freq, high_freq, root_freq;
34 Sint32
35 envelope_rate[6], envelope_offset[6];
36 float
37 volume;
38 sample_t *data;
39 Sint32
40 tremolo_sweep_increment, tremolo_phase_increment,
41 vibrato_sweep_increment, vibrato_control_ratio;
42 Uint8
43 tremolo_depth, vibrato_depth,
44 modes;
45 Sint8
46 panning, note_to_use;
47 } Sample;
48
49 typedef struct {
50 int
51 bank, program, volume, sustain, panning, pitchbend, expression,
52 mono, /* one note only on this channel -- not implemented yet */
53 pitchsens;
54 /* chorus, reverb... Coming soon to a 300-MHz, eight-way superscalar
55 processor near you */
56 float
57 pitchfactor; /* precomputed pitch bend factor to save some fdiv's */
58 } Channel;
59
60 typedef struct {
61 Uint8
62 status, channel, note, velocity;
63 Sample *sample;
64 Sint32
65 orig_frequency, frequency,
66 sample_offset, sample_increment,
67 envelope_volume, envelope_target, envelope_increment,
68 tremolo_sweep, tremolo_sweep_position,
69 tremolo_phase, tremolo_phase_increment,
70 vibrato_sweep, vibrato_sweep_position;
71
72 final_volume_t left_mix, right_mix;
73
74 float
75 left_amp, right_amp, tremolo_volume;
76 Sint32
77 vibrato_sample_increment[VIBRATO_SAMPLE_INCREMENTS];
78 int
79 vibrato_phase, vibrato_control_ratio, vibrato_control_counter,
80 envelope_stage, control_counter, panning, panned;
81
82 } Voice;
83
84 typedef struct {
85 int samples;
86 Sample *sample;
87 } Instrument;
88
89 /* Shared data */
90 typedef struct {
91 char *name;
92 int note, amp, pan, strip_loop, strip_envelope, strip_tail;
93 } ToneBankElement;
94
95 typedef struct {
96 ToneBankElement *tone;
97 Instrument *instrument[128];
98 } ToneBank;
99
100 typedef struct {
101 Sint32 time;
102 Uint8 channel, type, a, b;
103 } MidiEvent;
104
105 typedef struct {
106 MidiEvent event;
107 void *next;
108 } MidiEventList;
109
110 typedef struct {
111 int playing;
112 SDL_RWops *rw;
113 Sint32 rate;
114 Sint32 encoding;
115 float master_volume;
116 Sint32 amplification;
117 ToneBank *tonebank[128];
118 ToneBank *drumset[128];
119 Instrument *default_instrument;
120 int default_program;
121 void (*write)(void *dp, Sint32 *lp, Sint32 c);
122 int buffer_size;
123 sample_t *resample_buffer;
124 Sint32 *common_buffer;
125 Sint32 *buffer_pointer;
126 /* These would both fit into 32 bits, but they are often added in
127 large multiples, so it's simpler to have two roomy ints */
128 /* samples per MIDI delta-t */
129 Sint32 sample_increment;
130 Sint32 sample_correction;
131 Channel channel[16];
132 Voice voice[MAX_VOICES];
133 int voices;
134 Sint32 drumchannels;
135 Sint32 buffered_count;
136 Sint32 control_ratio;
137 Sint32 lost_notes;
138 Sint32 cut_notes;
139 Sint32 samples;
140 MidiEvent *events;
141 MidiEvent *current_event;
142 MidiEventList *evlist;
143 Sint32 current_sample;
144 Sint32 event_count;
145 Sint32 at;
146 } MidiSong;
147
148 /* Some of these are not defined in timidity.c but are here for convenience */
149
150 extern int Timidity_Init(void);
151 extern void Timidity_SetVolume(MidiSong *song, int volume);
152 extern int Timidity_PlaySome(MidiSong *song, void *stream, Sint32 len);
153 extern MidiSong *Timidity_LoadSong(SDL_RWops *rw, SDL_AudioSpec *audio);
154 extern void Timidity_Start(MidiSong *song);
155 extern void Timidity_FreeSong(MidiSong *song);
156 extern void Timidity_Exit(void);