annotate decoders/timidity/timidity.h @ 591:8faf61a640f0 tip

Resynced fixes for unit conversion bugs in the Ogg Tremor decoder from SoundDecoder/ALmixer. Ogg Vorbis uses seconds and we multiply by 1000 to convert to milliseconds. But Ogg Tremor already uses milliseconds but I was still multiplying by 1000.
author Eric Wing <ewing . public |-at-| gmail . com>
date Thu, 25 Oct 2012 16:34:18 -0700
parents c66080364dff
children
rev   line source
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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 #ifndef TIMIDITY_H
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23 #define TIMIDITY_H
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24 #ifdef __cplusplus
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25 extern "C" {
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26 #endif
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27
199
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28 typedef Sint16 sample_t;
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29 typedef Sint32 final_volume_t;
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30
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31 #define VIBRATO_SAMPLE_INCREMENTS 32
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32
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33 /* Maximum polyphony. */
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34 #define MAX_VOICES 48
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35
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36 typedef struct {
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37 Sint32
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38 loop_start, loop_end, data_length,
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39 sample_rate, low_vel, high_vel, low_freq, high_freq, root_freq;
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40 Sint32
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41 envelope_rate[6], envelope_offset[6];
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42 float
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43 volume;
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44 sample_t *data;
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45 Sint32
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46 tremolo_sweep_increment, tremolo_phase_increment,
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47 vibrato_sweep_increment, vibrato_control_ratio;
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48 Uint8
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49 tremolo_depth, vibrato_depth,
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50 modes;
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51 Sint8
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52 panning, note_to_use;
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53 } Sample;
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54
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55 typedef struct {
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56 int
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57 bank, program, volume, sustain, panning, pitchbend, expression,
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58 mono, /* one note only on this channel -- not implemented yet */
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59 pitchsens;
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60 /* chorus, reverb... Coming soon to a 300-MHz, eight-way superscalar
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61 processor near you */
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62 float
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63 pitchfactor; /* precomputed pitch bend factor to save some fdiv's */
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64 } Channel;
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65
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66 typedef struct {
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67 Uint8
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68 status, channel, note, velocity;
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69 Sample *sample;
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70 Sint32
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71 orig_frequency, frequency,
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72 sample_offset, sample_increment,
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73 envelope_volume, envelope_target, envelope_increment,
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74 tremolo_sweep, tremolo_sweep_position,
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75 tremolo_phase, tremolo_phase_increment,
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76 vibrato_sweep, vibrato_sweep_position;
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77
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78 final_volume_t left_mix, right_mix;
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79
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80 float
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81 left_amp, right_amp, tremolo_volume;
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82 Sint32
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83 vibrato_sample_increment[VIBRATO_SAMPLE_INCREMENTS];
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84 int
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85 vibrato_phase, vibrato_control_ratio, vibrato_control_counter,
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86 envelope_stage, control_counter, panning, panned;
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87
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88 } Voice;
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89
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90 typedef struct {
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91 int samples;
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92 Sample *sample;
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93 } Instrument;
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94
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95 /* Shared data */
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96 typedef struct {
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97 char *name;
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98 int note, amp, pan, strip_loop, strip_envelope, strip_tail;
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99 } ToneBankElement;
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100
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101 typedef struct {
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102 ToneBankElement *tone;
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103 Instrument *instrument[128];
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104 } ToneBank;
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105
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106 typedef struct {
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107 Sint32 time;
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108 Uint8 channel, type, a, b;
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109 } MidiEvent;
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110
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111 typedef struct {
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112 MidiEvent event;
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113 void *next;
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114 } MidiEventList;
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115
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116 struct _DLS_Data;
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117 typedef struct _DLS_Data DLS_Patches;
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118
199
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119 typedef struct {
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120 int playing;
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121 SDL_RWops *rw;
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122 Sint32 rate;
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123 Sint32 encoding;
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124 float master_volume;
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125 Sint32 amplification;
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126 DLS_Patches *patches;
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127 ToneBank *tonebank[128];
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128 ToneBank *drumset[128];
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129 Instrument *default_instrument;
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130 int default_program;
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131 void (*write)(void *dp, Sint32 *lp, Sint32 c);
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132 int buffer_size;
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133 sample_t *resample_buffer;
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134 Sint32 *common_buffer;
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135 Sint32 *buffer_pointer;
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136 /* These would both fit into 32 bits, but they are often added in
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137 large multiples, so it's simpler to have two roomy ints */
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138 /* samples per MIDI delta-t */
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139 Sint32 sample_increment;
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140 Sint32 sample_correction;
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141 Channel channel[16];
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142 Voice voice[MAX_VOICES];
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143 int voices;
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144 Sint32 drumchannels;
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145 Sint32 buffered_count;
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146 Sint32 control_ratio;
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147 Sint32 lost_notes;
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148 Sint32 cut_notes;
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149 Sint32 samples;
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150 MidiEvent *events;
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151 MidiEvent *current_event;
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152 MidiEventList *evlist;
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153 Sint32 current_sample;
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154 Sint32 event_count;
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155 Sint32 at;
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156 Sint32 groomed_event_count;
199
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157 } MidiSong;
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158
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159 /* Some of these are not defined in timidity.c but are here for convenience */
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160
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161 extern int Timidity_Init(void);
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162 extern int Timidity_Init_NoConfig(void);
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163 extern void Timidity_SetVolume(MidiSong *song, int volume);
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164 extern int Timidity_PlaySome(MidiSong *song, void *stream, Sint32 len);
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165 extern DLS_Patches *Timidity_LoadDLS(SDL_RWops *rw);
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166 extern void Timidity_FreeDLS(DLS_Patches *patches);
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167 extern MidiSong *Timidity_LoadDLSSong(SDL_RWops *rw, DLS_Patches *patches, SDL_AudioSpec *audio);
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168 extern MidiSong *Timidity_LoadSong(SDL_RWops *rw, SDL_AudioSpec *audio);
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169 extern void Timidity_Start(MidiSong *song);
312
498240aa76f1 Seek implementations.
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170 extern void Timidity_Seek(MidiSong *song, Uint32 ms);
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171 extern Uint32 Timidity_GetSongLength(MidiSong *song); /* returns millseconds */
199
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172 extern void Timidity_FreeSong(MidiSong *song);
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Ryan C. Gordon <icculus@icculus.org>
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173 extern void Timidity_Exit(void);
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174
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175 #ifdef __cplusplus
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176 }
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177 #endif
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178 #endif /* TIMIDITY_H */