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12
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1 /*
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2 * Name: MDRIVER.C
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3 *
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4 * Description: These routines are used to access the available soundcard
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5 * drivers.
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6 *
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7 * Portability: All systems - all compilers
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8 *
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9 */
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10
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11 #include "mikmod.h"
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12
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13 MDRIVER *firstdriver = NULL, *md_driver = &drv_nos;
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14
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15 UWORD md_device = 0;
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16 UWORD md_mixfreq = 44100;
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17 UWORD md_mode = DMODE_STEREO | DMODE_16BITS | DMODE_SURROUND;
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18 UWORD md_dmabufsize = 50;
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19 UBYTE md_pansep = 128; /* 128 == 100% (full left/right) */
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20
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21 UBYTE md_reverb = 6; /* Reverb */
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22
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23 UBYTE md_volume = 96; /* Global sound volume (0-128) */
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24 UBYTE md_musicvolume = 128; /* volume of song */
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25 UBYTE md_sndfxvolume = 128; /* volume of sound effects */
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26
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27 UBYTE md_bpm = 125;
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28
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29
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30 /* Do not modify the numchn variables yourself! use MD_SetVoices() */
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31
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32 UBYTE md_numchn = 0, md_sngchn = 0, md_sfxchn = 0;
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33 UBYTE md_hardchn = 0, md_softchn = 0;
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34
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35
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36 void (*md_player) (void) = Player_HandleTick;
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37 static BOOL isplaying = 0, initialized = 0;
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38 static UBYTE *sfxinfo;
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39 static int sfxpool;
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40
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41 static SAMPLE **md_sample = NULL;
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42
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43 /*
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44 * Backup variables. This way, the end programmer can fiddle with the main
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45 * globals without mikmod blowing up.
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46 */
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47
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48 static UWORD idevice, imixfreq, imode, idmabufsize;
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49
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50 /*
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51 * Limits the number of hardware voices to the specified amount. This
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52 * function should only be used by the low-level drivers.
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53 */
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54 static void
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55 LimitHardVoices(int limit)
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56 {
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57 int t = 0;
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58
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59 if (!(md_mode & DMODE_SOFT_SNDFX) && (md_sfxchn > limit))
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60 md_sfxchn = limit;
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61 if (!(md_mode & DMODE_SOFT_MUSIC) && (md_sngchn > limit))
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62 md_sngchn = limit;
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63
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64 if (!(md_mode & DMODE_SOFT_SNDFX))
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65 md_hardchn = md_sfxchn;
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66 else
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67 md_hardchn = 0;
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68
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69 if (!(md_mode & DMODE_SOFT_MUSIC))
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70 md_hardchn += md_sngchn;
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71
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72 while (md_hardchn > limit) {
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73 if (++t & 1)
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74 if (!(md_mode & DMODE_SOFT_SNDFX) && (md_sfxchn > 4))
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75 md_sfxchn--;
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76 else if (!(md_mode & DMODE_SOFT_MUSIC) && (md_sngchn > 8))
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77 md_sngchn--;
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78
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79 if (!(md_mode & DMODE_SOFT_SNDFX))
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80 md_hardchn = md_sfxchn;
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81 else
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82 md_hardchn = 0;
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83
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84 if (!(md_mode & DMODE_SOFT_MUSIC))
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85 md_hardchn += md_sngchn;
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86 }
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87
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88 md_numchn = md_hardchn + md_softchn;
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89 }
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90
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91 /*
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92 * Limits the number of hardware voices to the specified amount. This
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93 * function should only be used by the low-level drivers.
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94 */
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95 static void
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96 LimitSoftVoices(int limit)
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97 {
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98 int t = 0;
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99
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100 if ((md_mode & DMODE_SOFT_SNDFX) && (md_sfxchn > limit))
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101 md_sfxchn = limit;
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102 if ((md_mode & DMODE_SOFT_MUSIC) && (md_sngchn > limit))
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103 md_sngchn = limit;
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104
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105 if (md_mode & DMODE_SOFT_SNDFX)
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106 md_softchn = md_sfxchn;
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107 else
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108 md_softchn = 0;
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109
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110 if (md_mode & DMODE_SOFT_MUSIC)
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111 md_softchn += md_sngchn;
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112
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113 while (md_softchn > limit) {
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114 if (++t & 1)
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115 if ((md_mode & DMODE_SOFT_SNDFX) && (md_sfxchn > 4))
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116 md_sfxchn--;
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117 else if ((md_mode & DMODE_SOFT_MUSIC) && (md_sngchn > 8))
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118 md_sngchn--;
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119
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120 if (!(md_mode & DMODE_SOFT_SNDFX))
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121 md_softchn = md_sfxchn;
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122 else
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123 md_softchn = 0;
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124
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125 if (!(md_mode & DMODE_SOFT_MUSIC))
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126 md_softchn += md_sngchn;
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127 }
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128
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129 md_numchn = md_hardchn + md_softchn;
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130 }
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131
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132
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133 /*
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134 * Note: 'type' indicates whether the returned value should be for music or
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135 * for sound effects.
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136 */
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137 ULONG
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138 MD_SampleSpace(int type)
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139 {
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140 if (type == MD_MUSIC)
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141 type = (md_mode & DMODE_SOFT_MUSIC) ? MD_SOFTWARE : MD_HARDWARE;
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142 else if (type == MD_SNDFX)
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143 type = (md_mode & DMODE_SOFT_SNDFX) ? MD_SOFTWARE : MD_HARDWARE;
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144
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145 return md_driver->FreeSampleSpace(type);
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146 }
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147
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148
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149 ULONG
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150 MD_SampleLength(int type, SAMPLE * s)
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151 {
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152 if (type == MD_MUSIC)
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153 type = (md_mode & DMODE_SOFT_MUSIC) ? MD_SOFTWARE : MD_HARDWARE;
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154 else if (type == MD_SNDFX)
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155 type = (md_mode & DMODE_SOFT_SNDFX) ? MD_SOFTWARE : MD_HARDWARE;
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156
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157 return md_driver->RealSampleLength(type, s);
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158 }
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159
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160
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161 /*
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162 * Converts the given number of 1/10th seconds into the number of bytes of
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163 * audio that a sample # 1/10th seconds long would require at the current md_*
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164 * settings.
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165 */
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166 UWORD
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167 MD_SetDMA(int secs)
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168 {
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169 ULONG result;
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170
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171 result = (md_mixfreq * ((md_mode & DMODE_STEREO) ? 2 : 1) *
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172 ((md_mode & DMODE_16BITS) ? 2 : 1) * secs) * 10;
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173
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174 if (result > 32000)
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175 result = 32000;
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176 return (md_dmabufsize = (result & ~3)); /* round it off to an 8 byte
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177 * boundry */
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178 }
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179
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180
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181 void
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182 MD_InfoDriver(void)
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183 {
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184 int t;
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185 MDRIVER *l;
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186
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187 /* list all registered devicedrivers: */
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188 for (t = 1, l = firstdriver; l != NULL; l = l->next, t++)
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189 printf("%d. %s\n", t, l->Version);
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190 }
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191
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192
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193 void
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194 MD_RegisterDriver(MDRIVER * drv)
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195 {
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196 MDRIVER *cruise = firstdriver;
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197
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198 if (cruise != NULL) {
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199 while (cruise->next != NULL)
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200 cruise = cruise->next;
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201 cruise->next = drv;
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202 } else
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203 firstdriver = drv;
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204 }
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205
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206
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207 /* type - sample type .. MD_MUSIC or MD_SNDFX */
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208 SWORD
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209 MD_SampleLoad(SAMPLOAD * s, int type, FILE * fp)
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210 {
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211 SWORD result;
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212
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213 if (type == MD_MUSIC)
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214 type = (md_mode & DMODE_SOFT_MUSIC) ? MD_SOFTWARE : MD_HARDWARE;
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215 else if (type == MD_SNDFX)
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216 type = (md_mode & DMODE_SOFT_SNDFX) ? MD_SOFTWARE : MD_HARDWARE;
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217
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218 SL_Init(s);
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219 result = md_driver->SampleLoad(s, type, fp);
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220 SL_Exit(s);
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221
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222 return result;
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223 }
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224
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225
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226 void
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227 MD_SampleUnLoad(SWORD handle)
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228 {
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229 md_driver->SampleUnLoad(handle);
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230 }
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231
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232
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233 void
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234 MD_SetBPM(UBYTE bpm)
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235 {
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236 md_bpm = bpm;
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237 }
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238
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239
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240 void
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241 MikMod_RegisterPlayer(void (*player) (void))
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242 {
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243 md_player = player;
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244 }
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245
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246
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247 void
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248 MikMod_Update(void)
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249 {
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250 if (isplaying)
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251 md_driver->Update();
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252 }
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253
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254
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255 void
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256 Voice_SetVolume(int voice, UWORD vol)
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257 {
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258 ULONG tmp;
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259
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260 if ((voice < 0) || (voice >= md_numchn))
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261 return;
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262 tmp = (ULONG) vol *(ULONG) md_volume *
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263 ((voice < md_sngchn) ? (ULONG) md_musicvolume : (ULONG) md_sndfxvolume);
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264 md_driver->VoiceSetVolume(voice, tmp / 16384);
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265 }
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266
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267
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268 void
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269 Voice_SetFrequency(int voice, ULONG frq)
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270 {
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271 if ((voice < 0) || (voice >= md_numchn))
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272 return;
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273 if (md_sample[voice] != NULL && md_sample[voice]->divfactor != 0)
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274 frq /= md_sample[voice]->divfactor;
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275 md_driver->VoiceSetFrequency(voice, frq);
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276 }
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277
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278
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279 void
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280 Voice_SetPanning(int voice, ULONG pan)
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281 {
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282 if ((voice < 0) || (voice >= md_numchn))
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283 return;
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284 if (pan != PAN_SURROUND) {
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285 if (md_mode & DMODE_REVERSE)
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286 pan = 255 - pan;
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287 pan = (((SWORD) (pan - 128) * md_pansep) / 128) + 128;
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288 }
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289 md_driver->VoiceSetPanning(voice, pan);
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290 }
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291
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292
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293 void
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294 Voice_Play(int voice, SAMPLE * s, ULONG start)
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295 {
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296 ULONG repend;
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297
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298 if ((voice < 0) || (voice >= md_numchn) || (start >= s->length))
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299 return;
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300
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301 md_sample[voice] = s;
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302 repend = s->loopend;
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303
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304 if (s->flags & SF_LOOP)
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305 if (repend > s->length)
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306 repend = s->length; /* repend can't be bigger than size */
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307
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308 md_driver->VoicePlay(voice, s->handle, start, s->length, s->loopstart, repend, s->flags);
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309 }
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310
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311
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312 void
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313 Voice_Stop(int voice)
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314 {
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315 if ((voice < 0) || (voice >= md_numchn))
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316 return;
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317 if (voice >= md_sngchn) { /* It is a sound effects channel, so flag the
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318 * voice as non-critical! */
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319 sfxinfo[voice - md_sngchn] = 0;
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320 }
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321 md_driver->VoiceStop(voice);
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322 }
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323
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324
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325 BOOL
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326 Voice_Stopped(int voice)
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327 {
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328 if ((voice < 0) || (voice >= md_numchn))
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329 return 0;
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330 return (md_driver->VoiceStopped(voice));
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331 }
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332
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333
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334 SLONG
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335 Voice_GetPosition(int voice)
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336 {
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337 if ((voice < 0) || (voice >= md_numchn))
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338 return 0;
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339 return (md_driver->VoiceGetPosition(voice));
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340 }
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341
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342
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343 ULONG
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344 Voice_RealVolume(int voice)
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345 {
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346 if ((voice < 0) || (voice >= md_numchn))
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347 return 0;
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348 return (md_driver->VoiceRealVolume(voice));
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349 }
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350
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351
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352 /*
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353 * Functions prefixed with MikMod
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354 */
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355 BOOL
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356 MikMod_Init(void)
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357 {
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358 UWORD t;
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359
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360 _mm_critical = 1;
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361
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362 /* if md_device==0, try to find a device number */
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363
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364 if (md_device == 0) {
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365 for (t = 1, md_driver = firstdriver; md_driver != NULL; md_driver = md_driver->next, t++) {
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366 if (md_driver->IsPresent())
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367 break;
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368 }
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369
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370 if (md_driver == NULL) {
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371 _mm_errno = MMERR_DETECTING_DEVICE;
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372 if (_mm_errorhandler != NULL)
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373 _mm_errorhandler();
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374 md_driver = &drv_nos;
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375 return 1;
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376 }
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377 md_device = t;
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378 } else { /* if n>0 use that driver */
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379 for (t = 1, md_driver = firstdriver;
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380 (md_driver != NULL) && (t != md_device);
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381 md_driver = md_driver->next, t++)
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382 ; /* Nothing */
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383
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384 if (md_driver == NULL) {
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385 _mm_errno = MMERR_INVALID_DEVICE;
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386 if (_mm_errorhandler != NULL)
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387 _mm_errorhandler();
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388 md_driver = &drv_nos;
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389 return 1;
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390 }
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391 if (!md_driver->IsPresent()) {
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392 _mm_errno = MMERR_DETECTING_DEVICE;
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393 if (_mm_errorhandler != NULL)
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394 _mm_errorhandler();
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395 md_driver = &drv_nos;
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396 return 1;
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397 }
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398 }
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399
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400 if (md_driver->Init()) {
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401 MikMod_Exit();
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402 if (_mm_errorhandler != NULL)
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403 _mm_errorhandler();
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404 return 1;
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405 }
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406 idevice = md_device;
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407 imode = md_mode;
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408 imixfreq = md_mixfreq;
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409 idmabufsize = md_dmabufsize;
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410 initialized = 1;
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411 _mm_critical = 0;
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412
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413 return 0;
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414 }
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415
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416
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417 void
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418 MikMod_Exit(void)
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419 {
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420 MikMod_DisableOutput();
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421 md_driver->Exit();
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422 md_numchn = md_sfxchn = md_sngchn = 0;
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423 md_driver = &drv_nos;
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424 initialized = 0;
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425 }
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426
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427
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428 /*
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429 * Reset the driver using the new global variable settings. If the driver has
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430 * not been initialized, it will be now.
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431 */
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432 BOOL
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433 MikMod_Reset(void)
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434 {
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435 if (!initialized)
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436 return MikMod_Init();
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437 if ((md_driver->Reset == NULL) ||
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438 (md_device != idevice)) { /* md_driver->Reset was
|
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439 * NULL, or md_device
|
|
|
440 * was changed, so do a
|
|
|
441 * full reset of the
|
|
|
442 * driver. */
|
|
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443 if (isplaying)
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|
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444 md_driver->PlayStop();
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|
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445 md_driver->Exit();
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|
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446 if (MikMod_Init()) {
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|
|
447 MikMod_Exit();
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|
|
448 if (_mm_errorhandler != NULL)
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|
|
449 _mm_errorhandler();
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|
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450 return 1;
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|
|
451 }
|
|
|
452 if (isplaying)
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|
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453 md_driver->PlayStart();
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|
|
454 } else {
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|
|
455 if (md_driver->Reset()) {
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|
|
456 MikMod_Exit();
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|
|
457 if (_mm_errorhandler != NULL)
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|
|
458 _mm_errorhandler();
|
|
|
459 return 1;
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|
|
460 }
|
|
|
461 }
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|
|
462
|
|
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463 return 0;
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|
|
464 }
|
|
|
465
|
|
|
466
|
|
|
467 /* If either parameter is -1, the current set value will be retained. */
|
|
|
468 BOOL
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|
|
469 MikMod_SetNumVoices(int music, int sfx)
|
|
|
470 {
|
|
|
471 BOOL resume = 0;
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|
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472 int t, oldchn = 0;
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|
|
473
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|
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474 if ((music == 0) && (sfx == 0))
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|
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475 return 0;
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|
|
476
|
|
|
477 _mm_critical = 1;
|
|
|
478
|
|
|
479 if (isplaying) {
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|
|
480 MikMod_DisableOutput();
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|
|
481 oldchn = md_numchn;
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|
|
482 resume = 1;
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|
|
483 }
|
|
|
484 if (sfxinfo != NULL)
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|
|
485 free(sfxinfo);
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|
|
486 if (md_sample != NULL)
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|
|
487 free(md_sample);
|
|
|
488 md_sample = NULL;
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|
|
489 sfxinfo = NULL;
|
|
|
490
|
|
|
491 /*
|
|
|
492 * md_softchn = md_hardchn = 0;
|
|
|
493 *
|
|
|
494 * if(md_mode & DMODE_SOFT_SNDFX) md_softchn = sfx; else md_hardchn = sfx;
|
|
|
495 *
|
|
|
496 * if(md_mode & DMODE_SOFT_MUSIC) md_softchn += music; else md_hardchn +=
|
|
|
497 * music;
|
|
|
498 */
|
|
|
499
|
|
|
500 if (music != -1)
|
|
|
501 md_sngchn = music;
|
|
|
502 if (sfx != -1)
|
|
|
503 md_sfxchn = sfx;
|
|
|
504
|
|
|
505 md_numchn = md_sngchn + md_sfxchn;
|
|
|
506
|
|
|
507 LimitHardVoices(md_driver->HardVoiceLimit);
|
|
|
508 LimitSoftVoices(md_driver->SoftVoiceLimit);
|
|
|
509
|
|
|
510 if (md_driver->SetNumVoices()) {
|
|
|
511 MikMod_Exit();
|
|
|
512 md_numchn = md_softchn = md_hardchn = md_sfxchn = md_sngchn = 0;
|
|
|
513 if (_mm_errorhandler != NULL)
|
|
|
514 _mm_errorhandler();
|
|
|
515 return 1;
|
|
|
516 }
|
|
|
517 if (md_sngchn || md_sfxchn)
|
|
|
518 md_sample = (SAMPLE **) _mm_calloc(md_sngchn + md_sfxchn, sizeof(SAMPLE *));
|
|
|
519 if (md_sfxchn)
|
|
|
520 sfxinfo = (UBYTE *) _mm_calloc(md_sfxchn, sizeof(UBYTE));
|
|
|
521
|
|
|
522 /* make sure the player doesn't start with garbage */
|
|
|
523 for (t = oldchn; t < md_numchn; t++)
|
|
|
524 Voice_Stop(t);
|
|
|
525
|
|
|
526 sfxpool = 0;
|
|
|
527
|
|
|
528 if (resume)
|
|
|
529 MikMod_EnableOutput();
|
|
|
530 _mm_critical = 0;
|
|
|
531
|
|
|
532 return 0;
|
|
|
533 }
|
|
|
534
|
|
|
535
|
|
|
536 BOOL
|
|
|
537 MikMod_EnableOutput(void)
|
|
|
538 {
|
|
|
539 /*
|
|
|
540 * safety valve, prevents entering playstart twice:
|
|
|
541 */
|
|
|
542 _mm_critical = 1;
|
|
|
543 if (!isplaying) {
|
|
|
544 if (md_driver->PlayStart())
|
|
|
545 return 1;
|
|
|
546 isplaying = 1;
|
|
|
547 }
|
|
|
548 _mm_critical = 0;
|
|
|
549 return 0;
|
|
|
550 }
|
|
|
551
|
|
|
552
|
|
|
553 void
|
|
|
554 MikMod_DisableOutput(void)
|
|
|
555 {
|
|
|
556 /*
|
|
|
557 * safety valve, prevents calling playStop when playstart hasn't been
|
|
|
558 * called:
|
|
|
559 */
|
|
|
560
|
|
|
561 if (isplaying && md_driver != NULL) {
|
|
|
562 isplaying = 0;
|
|
|
563 md_driver->PlayStop();
|
|
|
564 }
|
|
|
565 }
|
|
|
566
|
|
|
567
|
|
|
568 BOOL
|
|
|
569 MikMod_Active(void)
|
|
|
570 {
|
|
|
571 return isplaying;
|
|
|
572 }
|
|
|
573
|
|
|
574
|
|
|
575 /*
|
|
|
576 * Plays a sound effects sample. Picks a voice from the number of voices
|
|
|
577 * allocated for use as sound effects (loops through voices, skipping all
|
|
|
578 * active criticals).
|
|
|
579 *
|
|
|
580 * Returns the voice that the sound is being played on.
|
|
|
581 */
|
|
|
582 int
|
|
|
583 MikMod_PlaySample(SAMPLE * s, ULONG start, UBYTE flags)
|
|
|
584 {
|
|
|
585 int orig = sfxpool; /* for cases where all channels are
|
|
|
586 * critical */
|
|
|
587 int c;
|
|
|
588
|
|
|
589 if (md_sfxchn == 0)
|
|
|
590 return -1;
|
|
|
591 if (s->volume > 64)
|
|
|
592 s->volume = 64;
|
|
|
593
|
|
|
594 /* check the first location after sfxpool */
|
|
|
595 do {
|
|
|
596 if (sfxinfo[sfxpool] & SFX_CRITICAL) {
|
|
|
597 if (md_driver->VoiceStopped(c = sfxpool + md_sngchn)) {
|
|
|
598 sfxinfo[sfxpool] = flags;
|
|
|
599 Voice_Play(c, s, start);
|
|
|
600 md_driver->VoiceSetVolume(c, s->volume << 2);
|
|
|
601 md_driver->VoiceSetPanning(c, s->panning);
|
|
|
602 md_driver->VoiceSetFrequency(c, s->speed);
|
|
|
603 sfxpool++;
|
|
|
604 if (sfxpool >= md_sfxchn)
|
|
|
605 sfxpool = 0;
|
|
|
606 return c;
|
|
|
607 }
|
|
|
608 } else {
|
|
|
609 sfxinfo[sfxpool] = flags;
|
|
|
610 Voice_Play(c = sfxpool + md_sngchn, s, start);
|
|
|
611 md_driver->VoiceSetVolume(c, s->volume << 2);
|
|
|
612 md_driver->VoiceSetPanning(c, s->panning);
|
|
|
613 md_driver->VoiceSetFrequency(c, s->speed);
|
|
|
614 sfxpool++;
|
|
|
615 if (sfxpool >= md_sfxchn)
|
|
|
616 sfxpool = 0;
|
|
|
617 return c;
|
|
|
618 }
|
|
|
619
|
|
|
620 sfxpool++;
|
|
|
621 if (sfxpool >= md_sfxchn)
|
|
|
622 sfxpool = 0;
|
|
|
623 } while (sfxpool != orig);
|
|
|
624
|
|
|
625 return -1;
|
|
|
626 }
|
