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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 playmidi.c -- random stuff in need of rearrangement
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21
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22 */
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23
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24 #if HAVE_CONFIG_H
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25 # include <config.h>
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26 #endif
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27
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28 #include <stdio.h>
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29 #include <stdlib.h>
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30 #include <string.h>
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31
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32 #include "SDL_sound.h"
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33
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34 #define __SDL_SOUND_INTERNAL__
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35 #include "SDL_sound_internal.h"
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36
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37 #include "timidity.h"
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38 #include "options.h"
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39 #include "instrum.h"
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40 #include "playmidi.h"
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41 #include "output.h"
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42 #include "mix.h"
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43 #include "tables.h"
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44
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45 static void adjust_amplification(MidiSong *song)
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46 {
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47 song->master_volume = (float)(song->amplification) / (float)100.0;
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48 }
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49
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50 static void reset_voices(MidiSong *song)
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51 {
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52 int i;
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53 for (i=0; i<MAX_VOICES; i++)
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54 song->voice[i].status=VOICE_FREE;
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55 }
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56
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57 /* Process the Reset All Controllers event */
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58 static void reset_controllers(MidiSong *song, int c)
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59 {
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60 song->channel[c].volume=90; /* Some standard says, although the SCC docs say 0. */
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61 song->channel[c].expression=127; /* SCC-1 does this. */
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62 song->channel[c].sustain=0;
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63 song->channel[c].pitchbend=0x2000;
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64 song->channel[c].pitchfactor=0; /* to be computed */
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65 }
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66
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67 static void reset_midi(MidiSong *song)
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68 {
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69 int i;
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70 for (i=0; i<16; i++)
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71 {
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72 reset_controllers(song, i);
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73 /* The rest of these are unaffected by the Reset All Controllers event */
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74 song->channel[i].program=song->default_program;
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75 song->channel[i].panning=NO_PANNING;
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76 song->channel[i].pitchsens=2;
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77 song->channel[i].bank=0; /* tone bank or drum set */
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78 }
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79 reset_voices(song);
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80 }
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81
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82 static void select_sample(MidiSong *song, int v, Instrument *ip)
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83 {
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84 Sint32 f, cdiff, diff;
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85 int s,i;
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86 Sample *sp, *closest;
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87
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88 s=ip->samples;
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89 sp=ip->sample;
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90
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91 if (s==1)
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92 {
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93 song->voice[v].sample=sp;
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94 return;
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95 }
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96
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97 f=song->voice[v].orig_frequency;
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98 for (i=0; i<s; i++)
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99 {
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100 if (sp->low_freq <= f && sp->high_freq >= f)
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101 {
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102 song->voice[v].sample=sp;
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103 return;
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104 }
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105 sp++;
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106 }
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107
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108 /*
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109 No suitable sample found! We'll select the sample whose root
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110 frequency is closest to the one we want. (Actually we should
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111 probably convert the low, high, and root frequencies to MIDI note
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112 values and compare those.) */
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113
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114 cdiff=0x7FFFFFFF;
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115 closest=sp=ip->sample;
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116 for(i=0; i<s; i++)
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117 {
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118 diff=sp->root_freq - f;
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119 if (diff<0) diff=-diff;
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120 if (diff<cdiff)
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121 {
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122 cdiff=diff;
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123 closest=sp;
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124 }
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125 sp++;
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126 }
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127 song->voice[v].sample=closest;
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128 return;
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129 }
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130
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131 static void recompute_freq(MidiSong *song, int v)
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132 {
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133 int
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134 sign=(song->voice[v].sample_increment < 0), /* for bidirectional loops */
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135 pb=song->channel[song->voice[v].channel].pitchbend;
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136 double a;
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137
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138 if (!song->voice[v].sample->sample_rate)
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139 return;
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140
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141 if (song->voice[v].vibrato_control_ratio)
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142 {
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143 /* This instrument has vibrato. Invalidate any precomputed
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144 sample_increments. */
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145
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146 int i=VIBRATO_SAMPLE_INCREMENTS;
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147 while (i--)
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148 song->voice[v].vibrato_sample_increment[i]=0;
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149 }
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150
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151 if (pb==0x2000 || pb<0 || pb>0x3FFF)
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152 song->voice[v].frequency = song->voice[v].orig_frequency;
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153 else
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154 {
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155 pb-=0x2000;
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156 if (!(song->channel[song->voice[v].channel].pitchfactor))
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157 {
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158 /* Damn. Somebody bent the pitch. */
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159 Sint32 i=pb*song->channel[song->voice[v].channel].pitchsens;
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160 if (pb<0)
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161 i=-i;
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162 song->channel[song->voice[v].channel].pitchfactor=
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163 (float)(bend_fine[(i>>5) & 0xFF] * bend_coarse[i>>13]);
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164 }
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165 if (pb>0)
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166 song->voice[v].frequency=
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167 (Sint32)(song->channel[song->voice[v].channel].pitchfactor *
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168 (double)(song->voice[v].orig_frequency));
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169 else
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170 song->voice[v].frequency=
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171 (Sint32)((double)(song->voice[v].orig_frequency) /
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172 song->channel[song->voice[v].channel].pitchfactor);
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173 }
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174
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175 a = FSCALE(((double)(song->voice[v].sample->sample_rate) *
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176 (double)(song->voice[v].frequency)) /
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177 ((double)(song->voice[v].sample->root_freq) *
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178 (double)(song->rate)),
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179 FRACTION_BITS);
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180
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181 if (sign)
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182 a = -a; /* need to preserve the loop direction */
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183
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184 song->voice[v].sample_increment = (Sint32)(a);
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185 }
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186
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187 static void recompute_amp(MidiSong *song, int v)
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188 {
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189 Sint32 tempamp;
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190
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191 /* TODO: use fscale */
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192
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193 tempamp= (song->voice[v].velocity *
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194 song->channel[song->voice[v].channel].volume *
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195 song->channel[song->voice[v].channel].expression); /* 21 bits */
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196
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197 if (!(song->encoding & PE_MONO))
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198 {
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199 if (song->voice[v].panning > 60 && song->voice[v].panning < 68)
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200 {
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201 song->voice[v].panned=PANNED_CENTER;
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202
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203 song->voice[v].left_amp=
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204 FSCALENEG((double)(tempamp) * song->voice[v].sample->volume * song->master_volume,
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205 21);
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206 }
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207 else if (song->voice[v].panning<5)
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208 {
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209 song->voice[v].panned = PANNED_LEFT;
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210
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211 song->voice[v].left_amp=
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212 FSCALENEG((double)(tempamp) * song->voice[v].sample->volume * song->master_volume,
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213 20);
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214 }
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215 else if (song->voice[v].panning>123)
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216 {
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217 song->voice[v].panned = PANNED_RIGHT;
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218
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219 song->voice[v].left_amp= /* left_amp will be used */
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220 FSCALENEG((double)(tempamp) * song->voice[v].sample->volume * song->master_volume,
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221 20);
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222 }
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223 else
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224 {
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225 song->voice[v].panned = PANNED_MYSTERY;
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226
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227 song->voice[v].left_amp=
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228 FSCALENEG((double)(tempamp) * song->voice[v].sample->volume * song->master_volume,
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229 27);
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230 song->voice[v].right_amp = song->voice[v].left_amp * (song->voice[v].panning);
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231 song->voice[v].left_amp *= (float)(127 - song->voice[v].panning);
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232 }
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233 }
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234 else
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235 {
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236 song->voice[v].panned = PANNED_CENTER;
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237
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238 song->voice[v].left_amp=
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239 FSCALENEG((double)(tempamp) * song->voice[v].sample->volume * song->master_volume,
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240 21);
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241 }
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242 }
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243
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244 static void start_note(MidiSong *song, MidiEvent *e, int i)
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245 {
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246 Instrument *ip;
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247 int j;
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248
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249 if (ISDRUMCHANNEL(song, e->channel))
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250 {
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251 if (!(ip=song->drumset[song->channel[e->channel].bank]->instrument[e->a]))
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252 {
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253 if (!(ip=song->drumset[0]->instrument[e->a]))
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254 return; /* No instrument? Then we can't play. */
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255 }
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256 if (ip->samples != 1)
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257 {
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258 SNDDBG(("Strange: percussion instrument with %d samples!",
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259 ip->samples));
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260 }
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261
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262 if (ip->sample->note_to_use) /* Do we have a fixed pitch? */
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263 song->voice[i].orig_frequency = freq_table[(int)(ip->sample->note_to_use)];
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264 else
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265 song->voice[i].orig_frequency = freq_table[e->a & 0x7F];
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266
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267 /* drums are supposed to have only one sample */
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268 song->voice[i].sample = ip->sample;
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269 }
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270 else
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271 {
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272 if (song->channel[e->channel].program == SPECIAL_PROGRAM)
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273 ip=song->default_instrument;
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274 else if (!(ip=song->tonebank[song->channel[e->channel].bank]->
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275 instrument[song->channel[e->channel].program]))
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276 {
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277 if (!(ip=song->tonebank[0]->instrument[song->channel[e->channel].program]))
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278 return; /* No instrument? Then we can't play. */
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279 }
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280
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281 if (ip->sample->note_to_use) /* Fixed-pitch instrument? */
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282 song->voice[i].orig_frequency = freq_table[(int)(ip->sample->note_to_use)];
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283 else
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284 song->voice[i].orig_frequency = freq_table[e->a & 0x7F];
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285 select_sample(song, i, ip);
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286 }
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287
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288 song->voice[i].status = VOICE_ON;
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289 song->voice[i].channel = e->channel;
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290 song->voice[i].note = e->a;
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291 song->voice[i].velocity = e->b;
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292 song->voice[i].sample_offset = 0;
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293 song->voice[i].sample_increment = 0; /* make sure it isn't negative */
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294
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295 song->voice[i].tremolo_phase = 0;
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296 song->voice[i].tremolo_phase_increment = song->voice[i].sample->tremolo_phase_increment;
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297 song->voice[i].tremolo_sweep = song->voice[i].sample->tremolo_sweep_increment;
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298 song->voice[i].tremolo_sweep_position = 0;
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299
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300 song->voice[i].vibrato_sweep = song->voice[i].sample->vibrato_sweep_increment;
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301 song->voice[i].vibrato_sweep_position = 0;
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302 song->voice[i].vibrato_control_ratio = song->voice[i].sample->vibrato_control_ratio;
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303 song->voice[i].vibrato_control_counter = song->voice[i].vibrato_phase = 0;
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304 for (j=0; j<VIBRATO_SAMPLE_INCREMENTS; j++)
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305 song->voice[i].vibrato_sample_increment[j] = 0;
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306
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307 if (song->channel[e->channel].panning != NO_PANNING)
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308 song->voice[i].panning = song->channel[e->channel].panning;
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309 else
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310 song->voice[i].panning = song->voice[i].sample->panning;
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311
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312 recompute_freq(song, i);
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313 recompute_amp(song, i);
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314 if (song->voice[i].sample->modes & MODES_ENVELOPE)
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315 {
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316 /* Ramp up from 0 */
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317 song->voice[i].envelope_stage = 0;
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318 song->voice[i].envelope_volume = 0;
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319 song->voice[i].control_counter = 0;
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320 recompute_envelope(song, i);
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321 apply_envelope_to_amp(song, i);
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322 }
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323 else
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324 {
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325 song->voice[i].envelope_increment = 0;
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326 apply_envelope_to_amp(song, i);
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327 }
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328 }
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329
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330 static void kill_note(MidiSong *song, int i)
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331 {
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332 song->voice[i].status = VOICE_DIE;
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333 }
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334
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335 /* Only one instance of a note can be playing on a single channel. */
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336 static void note_on(MidiSong *song)
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337 {
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338 int i = song->voices, lowest=-1;
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339 Sint32 lv=0x7FFFFFFF, v;
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340 MidiEvent *e = song->current_event;
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341
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342 while (i--)
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343 {
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344 if (song->voice[i].status == VOICE_FREE)
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345 lowest=i; /* Can't get a lower volume than silence */
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346 else if (song->voice[i].channel==e->channel &&
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347 (song->voice[i].note==e->a || song->channel[song->voice[i].channel].mono))
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348 kill_note(song, i);
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349 }
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350
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351 if (lowest != -1)
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352 {
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353 /* Found a free voice. */
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354 start_note(song,e,lowest);
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355 return;
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356 }
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357
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358 /* Look for the decaying note with the lowest volume */
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359 i = song->voices;
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360 while (i--)
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361 {
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362 if ((song->voice[i].status != VOICE_ON) &&
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363 (song->voice[i].status != VOICE_DIE))
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364 {
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365 v = song->voice[i].left_mix;
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366 if ((song->voice[i].panned == PANNED_MYSTERY)
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367 && (song->voice[i].right_mix > v))
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368 v = song->voice[i].right_mix;
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369 if (v<lv)
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370 {
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371 lv=v;
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372 lowest=i;
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373 }
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374 }
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375 }
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376
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377 if (lowest != -1)
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378 {
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379 /* This can still cause a click, but if we had a free voice to
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380 spare for ramping down this note, we wouldn't need to kill it
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381 in the first place... Still, this needs to be fixed. Perhaps
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382 we could use a reserve of voices to play dying notes only. */
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383
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384 song->cut_notes++;
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385 song->voice[lowest].status=VOICE_FREE;
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386 start_note(song,e,lowest);
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387 }
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388 else
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389 song->lost_notes++;
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390 }
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391
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392 static void finish_note(MidiSong *song, int i)
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393 {
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394 if (song->voice[i].sample->modes & MODES_ENVELOPE)
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395 {
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396 /* We need to get the envelope out of Sustain stage */
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397 song->voice[i].envelope_stage = 3;
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398 song->voice[i].status = VOICE_OFF;
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399 recompute_envelope(song, i);
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400 apply_envelope_to_amp(song, i);
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401 }
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402 else
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|
403 {
|
|
|
404 /* Set status to OFF so resample_voice() will let this voice out
|
|
|
405 of its loop, if any. In any case, this voice dies when it
|
|
|
406 hits the end of its data (ofs>=data_length). */
|
|
|
407 song->voice[i].status = VOICE_OFF;
|
|
|
408 }
|
|
|
409 }
|
|
|
410
|
|
|
411 static void note_off(MidiSong *song)
|
|
|
412 {
|
|
|
413 int i = song->voices;
|
|
|
414 MidiEvent *e = song->current_event;
|
|
|
415
|
|
|
416 while (i--)
|
|
|
417 if (song->voice[i].status == VOICE_ON &&
|
|
|
418 song->voice[i].channel == e->channel &&
|
|
|
419 song->voice[i].note == e->a)
|
|
|
420 {
|
|
|
421 if (song->channel[e->channel].sustain)
|
|
|
422 {
|
|
|
423 song->voice[i].status = VOICE_SUSTAINED;
|
|
|
424 }
|
|
|
425 else
|
|
|
426 finish_note(song, i);
|
|
|
427 return;
|
|
|
428 }
|
|
|
429 }
|
|
|
430
|
|
|
431 /* Process the All Notes Off event */
|
|
|
432 static void all_notes_off(MidiSong *song)
|
|
|
433 {
|
|
|
434 int i = song->voices;
|
|
|
435 int c = song->current_event->channel;
|
|
|
436
|
|
|
437 SNDDBG(("All notes off on channel %d", c));
|
|
|
438 while (i--)
|
|
|
439 if (song->voice[i].status == VOICE_ON &&
|
|
|
440 song->voice[i].channel == c)
|
|
|
441 {
|
|
|
442 if (song->channel[c].sustain)
|
|
|
443 song->voice[i].status = VOICE_SUSTAINED;
|
|
|
444 else
|
|
|
445 finish_note(song, i);
|
|
|
446 }
|
|
|
447 }
|
|
|
448
|
|
|
449 /* Process the All Sounds Off event */
|
|
|
450 static void all_sounds_off(MidiSong *song)
|
|
|
451 {
|
|
|
452 int i = song->voices;
|
|
|
453 int c = song->current_event->channel;
|
|
|
454
|
|
|
455 while (i--)
|
|
|
456 if (song->voice[i].channel == c &&
|
|
|
457 song->voice[i].status != VOICE_FREE &&
|
|
|
458 song->voice[i].status != VOICE_DIE)
|
|
|
459 {
|
|
|
460 kill_note(song, i);
|
|
|
461 }
|
|
|
462 }
|
|
|
463
|
|
|
464 static void adjust_pressure(MidiSong *song)
|
|
|
465 {
|
|
|
466 MidiEvent *e = song->current_event;
|
|
|
467 int i = song->voices;
|
|
|
468
|
|
|
469 while (i--)
|
|
|
470 if (song->voice[i].status == VOICE_ON &&
|
|
|
471 song->voice[i].channel == e->channel &&
|
|
|
472 song->voice[i].note == e->a)
|
|
|
473 {
|
|
|
474 song->voice[i].velocity = e->b;
|
|
|
475 recompute_amp(song, i);
|
|
|
476 apply_envelope_to_amp(song, i);
|
|
|
477 return;
|
|
|
478 }
|
|
|
479 }
|
|
|
480
|
|
|
481 static void drop_sustain(MidiSong *song)
|
|
|
482 {
|
|
|
483 int i = song->voices;
|
|
|
484 int c = song->current_event->channel;
|
|
|
485
|
|
|
486 while (i--)
|
|
|
487 if (song->voice[i].status == VOICE_SUSTAINED && song->voice[i].channel == c)
|
|
|
488 finish_note(song, i);
|
|
|
489 }
|
|
|
490
|
|
|
491 static void adjust_pitchbend(MidiSong *song)
|
|
|
492 {
|
|
|
493 int c = song->current_event->channel;
|
|
|
494 int i = song->voices;
|
|
|
495
|
|
|
496 while (i--)
|
|
|
497 if (song->voice[i].status != VOICE_FREE && song->voice[i].channel == c)
|
|
|
498 {
|
|
|
499 recompute_freq(song, i);
|
|
|
500 }
|
|
|
501 }
|
|
|
502
|
|
|
503 static void adjust_volume(MidiSong *song)
|
|
|
504 {
|
|
|
505 int c = song->current_event->channel;
|
|
|
506 int i = song->voices;
|
|
|
507
|
|
|
508 while (i--)
|
|
|
509 if (song->voice[i].channel == c &&
|
|
|
510 (song->voice[i].status==VOICE_ON || song->voice[i].status==VOICE_SUSTAINED))
|
|
|
511 {
|
|
|
512 recompute_amp(song, i);
|
|
|
513 apply_envelope_to_amp(song, i);
|
|
|
514 }
|
|
|
515 }
|
|
|
516
|
|
|
517 static void seek_forward(MidiSong *song, Sint32 until_time)
|
|
|
518 {
|
|
|
519 reset_voices(song);
|
|
|
520 while (song->current_event->time < until_time)
|
|
|
521 {
|
|
|
522 switch(song->current_event->type)
|
|
|
523 {
|
|
|
524 /* All notes stay off. Just handle the parameter changes. */
|
|
|
525
|
|
|
526 case ME_PITCH_SENS:
|
|
|
527 song->channel[song->current_event->channel].pitchsens =
|
|
|
528 song->current_event->a;
|
|
|
529 song->channel[song->current_event->channel].pitchfactor = 0;
|
|
|
530 break;
|
|
|
531
|
|
|
532 case ME_PITCHWHEEL:
|
|
|
533 song->channel[song->current_event->channel].pitchbend =
|
|
|
534 song->current_event->a + song->current_event->b * 128;
|
|
|
535 song->channel[song->current_event->channel].pitchfactor = 0;
|
|
|
536 break;
|
|
|
537
|
|
|
538 case ME_MAINVOLUME:
|
|
|
539 song->channel[song->current_event->channel].volume =
|
|
|
540 song->current_event->a;
|
|
|
541 break;
|
|
|
542
|
|
|
543 case ME_PAN:
|
|
|
544 song->channel[song->current_event->channel].panning =
|
|
|
545 song->current_event->a;
|
|
|
546 break;
|
|
|
547
|
|
|
548 case ME_EXPRESSION:
|
|
|
549 song->channel[song->current_event->channel].expression =
|
|
|
550 song->current_event->a;
|
|
|
551 break;
|
|
|
552
|
|
|
553 case ME_PROGRAM:
|
|
|
554 if (ISDRUMCHANNEL(song, song->current_event->channel))
|
|
|
555 /* Change drum set */
|
|
|
556 song->channel[song->current_event->channel].bank =
|
|
|
557 song->current_event->a;
|
|
|
558 else
|
|
|
559 song->channel[song->current_event->channel].program =
|
|
|
560 song->current_event->a;
|
|
|
561 break;
|
|
|
562
|
|
|
563 case ME_SUSTAIN:
|
|
|
564 song->channel[song->current_event->channel].sustain =
|
|
|
565 song->current_event->a;
|
|
|
566 break;
|
|
|
567
|
|
|
568 case ME_RESET_CONTROLLERS:
|
|
|
569 reset_controllers(song, song->current_event->channel);
|
|
|
570 break;
|
|
|
571
|
|
|
572 case ME_TONE_BANK:
|
|
|
573 song->channel[song->current_event->channel].bank =
|
|
|
574 song->current_event->a;
|
|
|
575 break;
|
|
|
576
|
|
|
577 case ME_EOT:
|
|
|
578 song->current_sample = song->current_event->time;
|
|
|
579 return;
|
|
|
580 }
|
|
|
581 song->current_event++;
|
|
|
582 }
|
|
|
583 /*song->current_sample=song->current_event->time;*/
|
|
|
584 if (song->current_event != song->events)
|
|
|
585 song->current_event--;
|
|
|
586 song->current_sample=until_time;
|
|
|
587 }
|
|
|
588
|
|
|
589 static void skip_to(MidiSong *song, Sint32 until_time)
|
|
|
590 {
|
|
|
591 if (song->current_sample > until_time)
|
|
|
592 song->current_sample = 0;
|
|
|
593
|
|
|
594 reset_midi(song);
|
|
|
595 song->buffered_count = 0;
|
|
|
596 song->buffer_pointer = song->common_buffer;
|
|
|
597 song->current_event = song->events;
|
|
|
598
|
|
|
599 if (until_time)
|
|
|
600 seek_forward(song, until_time);
|
|
|
601 }
|
|
|
602
|
|
|
603 static void do_compute_data(MidiSong *song, Sint32 count)
|
|
|
604 {
|
|
|
605 int i;
|
|
|
606 memset(song->buffer_pointer, 0,
|
|
|
607 (song->encoding & PE_MONO) ? (count * 4) : (count * 8));
|
|
|
608 for (i = 0; i < song->voices; i++)
|
|
|
609 {
|
|
|
610 if(song->voice[i].status != VOICE_FREE)
|
|
|
611 mix_voice(song, song->buffer_pointer, i, count);
|
|
|
612 }
|
|
|
613 song->current_sample += count;
|
|
|
614 }
|
|
|
615
|
|
|
616 /* count=0 means flush remaining buffered data to output device, then
|
|
|
617 flush the device itself */
|
|
|
618 static void compute_data(MidiSong *song, void *stream, Sint32 count)
|
|
|
619 {
|
|
|
620 int channels;
|
|
|
621
|
|
|
622 if ( song->encoding & PE_MONO )
|
|
|
623 channels = 1;
|
|
|
624 else
|
|
|
625 channels = 2;
|
|
|
626
|
|
|
627 if (!count)
|
|
|
628 {
|
|
|
629 if (song->buffered_count)
|
|
|
630 song->write(stream, song->common_buffer, channels * song->buffered_count);
|
|
|
631 song->buffer_pointer = song->common_buffer;
|
|
|
632 song->buffered_count = 0;
|
|
|
633 return;
|
|
|
634 }
|
|
|
635
|
|
|
636 while ((count + song->buffered_count) >= song->buffer_size)
|
|
|
637 {
|
|
|
638 do_compute_data(song, song->buffer_size - song->buffered_count);
|
|
|
639 count -= song->buffer_size - song->buffered_count;
|
|
|
640 song->write(stream, song->common_buffer, channels * song->buffer_size);
|
|
|
641 song->buffer_pointer = song->common_buffer;
|
|
|
642 song->buffered_count = 0;
|
|
|
643 }
|
|
|
644 if (count>0)
|
|
|
645 {
|
|
|
646 do_compute_data(song, count);
|
|
|
647 song->buffered_count += count;
|
|
|
648 song->buffer_pointer += (song->encoding & PE_MONO) ? count : count*2;
|
|
|
649 }
|
|
|
650 }
|
|
|
651
|
|
|
652 void Timidity_Start(MidiSong *song)
|
|
|
653 {
|
|
|
654 song->playing = 1;
|
|
|
655 adjust_amplification(song);
|
|
|
656 skip_to(song, 0);
|
|
|
657 }
|
|
|
658
|
|
|
659 int Timidity_PlaySome(MidiSong *song, void *stream, Sint32 len)
|
|
|
660 {
|
|
|
661 Sint32 start_sample, end_sample, samples;
|
|
|
662 int bytes_per_sample;
|
|
|
663
|
|
|
664 if (!song->playing)
|
|
|
665 return 0;
|
|
|
666
|
|
|
667 bytes_per_sample =
|
|
|
668 ((song->encoding & PE_MONO) ? 1 : 2)
|
|
|
669 * ((song->encoding & PE_16BIT) ? 2 : 1);
|
|
|
670 samples = len / bytes_per_sample;
|
|
|
671
|
|
|
672 start_sample = song->current_sample;
|
|
|
673 end_sample = song->current_sample+samples;
|
|
|
674 while ( song->current_sample < end_sample ) {
|
|
|
675 /* Handle all events that should happen at this time */
|
|
|
676 while (song->current_event->time <= song->current_sample) {
|
|
|
677 switch(song->current_event->type) {
|
|
|
678
|
|
|
679 /* Effects affecting a single note */
|
|
|
680
|
|
|
681 case ME_NOTEON:
|
|
|
682 if (!(song->current_event->b)) /* Velocity 0? */
|
|
|
683 note_off(song);
|
|
|
684 else
|
|
|
685 note_on(song);
|
|
|
686 break;
|
|
|
687
|
|
|
688 case ME_NOTEOFF:
|
|
|
689 note_off(song);
|
|
|
690 break;
|
|
|
691
|
|
|
692 case ME_KEYPRESSURE:
|
|
|
693 adjust_pressure(song);
|
|
|
694 break;
|
|
|
695
|
|
|
696 /* Effects affecting a single channel */
|
|
|
697
|
|
|
698 case ME_PITCH_SENS:
|
|
|
699 song->channel[song->current_event->channel].pitchsens =
|
|
|
700 song->current_event->a;
|
|
|
701 song->channel[song->current_event->channel].pitchfactor = 0;
|
|
|
702 break;
|
|
|
703
|
|
|
704 case ME_PITCHWHEEL:
|
|
|
705 song->channel[song->current_event->channel].pitchbend =
|
|
|
706 song->current_event->a + song->current_event->b * 128;
|
|
|
707 song->channel[song->current_event->channel].pitchfactor = 0;
|
|
|
708 /* Adjust pitch for notes already playing */
|
|
|
709 adjust_pitchbend(song);
|
|
|
710 break;
|
|
|
711
|
|
|
712 case ME_MAINVOLUME:
|
|
|
713 song->channel[song->current_event->channel].volume =
|
|
|
714 song->current_event->a;
|
|
|
715 adjust_volume(song);
|
|
|
716 break;
|
|
|
717
|
|
|
718 case ME_PAN:
|
|
|
719 song->channel[song->current_event->channel].panning =
|
|
|
720 song->current_event->a;
|
|
|
721 break;
|
|
|
722
|
|
|
723 case ME_EXPRESSION:
|
|
|
724 song->channel[song->current_event->channel].expression =
|
|
|
725 song->current_event->a;
|
|
|
726 adjust_volume(song);
|
|
|
727 break;
|
|
|
728
|
|
|
729 case ME_PROGRAM:
|
|
|
730 if (ISDRUMCHANNEL(song, song->current_event->channel)) {
|
|
|
731 /* Change drum set */
|
|
|
732 song->channel[song->current_event->channel].bank =
|
|
|
733 song->current_event->a;
|
|
|
734 }
|
|
|
735 else
|
|
|
736 song->channel[song->current_event->channel].program =
|
|
|
737 song->current_event->a;
|
|
|
738 break;
|
|
|
739
|
|
|
740 case ME_SUSTAIN:
|
|
|
741 song->channel[song->current_event->channel].sustain =
|
|
|
742 song->current_event->a;
|
|
|
743 if (!song->current_event->a)
|
|
|
744 drop_sustain(song);
|
|
|
745 break;
|
|
|
746
|
|
|
747 case ME_RESET_CONTROLLERS:
|
|
|
748 reset_controllers(song, song->current_event->channel);
|
|
|
749 break;
|
|
|
750
|
|
|
751 case ME_ALL_NOTES_OFF:
|
|
|
752 all_notes_off(song);
|
|
|
753 break;
|
|
|
754
|
|
|
755 case ME_ALL_SOUNDS_OFF:
|
|
|
756 all_sounds_off(song);
|
|
|
757 break;
|
|
|
758
|
|
|
759 case ME_TONE_BANK:
|
|
|
760 song->channel[song->current_event->channel].bank =
|
|
|
761 song->current_event->a;
|
|
|
762 break;
|
|
|
763
|
|
|
764 case ME_EOT:
|
|
|
765 /* Give the last notes a couple of seconds to decay */
|
|
|
766 SNDDBG(("Playing time: ~%d seconds\n",
|
|
|
767 song->current_sample/song->rate+2));
|
|
|
768 SNDDBG(("Notes cut: %d\n", song->cut_notes));
|
|
|
769 SNDDBG(("Notes lost totally: %d\n", song->lost_notes));
|
|
|
770 song->playing = 0;
|
|
|
771 return (song->current_sample - start_sample) * bytes_per_sample;
|
|
|
772 }
|
|
|
773 song->current_event++;
|
|
|
774 }
|
|
|
775 if (song->current_event->time > end_sample)
|
|
|
776 compute_data(song, stream, end_sample-song->current_sample);
|
|
|
777 else
|
|
|
778 compute_data(song, stream, song->current_event->time-song->current_sample);
|
|
|
779 }
|
|
|
780 return samples * bytes_per_sample;
|
|
|
781 }
|
|
|
782
|
|
|
783 void Timidity_SetVolume(MidiSong *song, int volume)
|
|
|
784 {
|
|
|
785 int i;
|
|
|
786 if (volume > MAX_AMPLIFICATION)
|
|
|
787 song->amplification = MAX_AMPLIFICATION;
|
|
|
788 else
|
|
|
789 if (volume < 0)
|
|
|
790 song->amplification = 0;
|
|
|
791 else
|
|
|
792 song->amplification = volume;
|
|
|
793 adjust_amplification(song);
|
|
|
794 for (i = 0; i < song->voices; i++)
|
|
|
795 if (song->voice[i].status != VOICE_FREE)
|
|
|
796 {
|
|
|
797 recompute_amp(song, i);
|
|
|
798 apply_envelope_to_amp(song, i);
|
|
|
799 }
|
|
|
800 }
|
