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8
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1 /*
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2
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3 Name:
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4 DRV_SGI.C, version 0.2
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5 Copyright 1996 by Stephan Kanthak, kanthak@i6.informatik.rwth-aachen.de
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6
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7 Version 0.2 - updated to use new driver API
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8
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9 Description:
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10 Mikmod driver for output on SGI audio system (needs libaudio from the
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11 dmedia package).
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12
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13 Portability:
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14 SGI only. Mainly based on voxware driver.
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15
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16 Fragment configuration:
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17 =======================
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18
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19 You can use the environment variables 'MM_SGI_FRAGSIZE' and
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20 'MM_SGI_BUFSIZE' to override the default size of the audio buffer. If you
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21 experience crackles & pops, try experimenting with these values.
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22
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23 Please read README.SGI first before contacting the author because there are
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24 some things to know about the specials of the SGI audio driver.
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25
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26 */
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27
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28
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29 #include <stdio.h>
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30 #include <stdlib.h>
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31 #include <unistd.h>
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32 #include <dmedia/audio.h>
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33 #include "mikmod.h"
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34
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35 #define DEFAULT_SGI_FRAGSIZE 5000
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36 #define DEFAULT_SGI_BUFSIZE 10000
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37
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38 static ALconfig sgi_config;
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39 static ALport sgi_port;
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40 static int sample_factor;
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41 static int sgi_fragsize;
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42 static int sgi_bufsize;
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43 static char* audiobuffer;
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44
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45
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46 static BOOL SGI_IsThere(void)
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47 {
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48 long params[] = { AL_OUTPUT_RATE, 0 };
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49
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50 ALqueryparams(AL_DEFAULT_DEVICE, params, 2);
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51 if (params[1] != 0) return 1;
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52 else return 0;
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53 }
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54
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55 static BOOL SGI_Init(void)
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56 {
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57 char *env;
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58 int play_rate;
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59 int fragsize,numfrags;
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60 long chpars[] = { AL_OUTPUT_RATE, AL_RATE_22050 };
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61
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62 printf("SGI audio driver: ");
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63 switch(md_mixfreq) {
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64 case 22050:
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65 chpars[1] = AL_RATE_22050;
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66 break;
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67 case 44100:
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68 chpars[1] = AL_RATE_44100;
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69 break;
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70 default:
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71 printf("mixing rate not supported.\n");
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72 return 0;
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73 break;
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74 }
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75 ALsetparams(AL_DEFAULT_DEVICE, chpars, 2);
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76
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77 if ((sgi_config = ALnewconfig()) == 0) {
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78 printf("cannot configure sound device.\n");
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79 return 0;
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80 }
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81
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82 if (md_mode & DMODE_16BITS) {
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83 if (ALsetwidth(sgi_config, AL_SAMPLE_16) < 0) {
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84 printf("samplesize of 16 bits not supported.\n");
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85 return 0;
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86 }
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87 sample_factor = 2;
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88 } else {
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89 if (ALsetwidth(sgi_config, AL_SAMPLE_8) < 0) {
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90 printf("samplesize of 8 bits not supported.\n");
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91 return 0;
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92 }
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93 sample_factor = 1;
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94 }
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95
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96 if (md_mode & DMODE_STEREO) {
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97 if (ALsetchannels(sgi_config, AL_STEREO) < 0) {
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98 printf("stereo mode not supported.\n");
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99 return 0;
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100 }
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101 } else{
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102 if (ALsetchannels(sgi_config, AL_MONO) < 0) {
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103 printf("mono mode not supported.\n");
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104 return 0;
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105 }
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106 }
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107
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108 if(!VC_Init()){
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109 return 0;
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110 }
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111
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112 sgi_fragsize=(env=getenv("MM_SGI_FRAGSIZE")) ? atol(env) : DEFAULT_SGI_BUFSIZE;
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113 sgi_bufsize=(env=getenv("MM_SGI_BUFSIZE")) ? atol(env) : DEFAULT_SGI_BUFSIZE;
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114
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115 ALsetqueuesize(sgi_config, sgi_bufsize);
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116 if ((sgi_port = ALopenport("Mod4X", "w", sgi_config)) == 0) {
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117 printf("cannot open SGI audio port.\n");
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118 return 0;
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119 }
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120 printf("%dHz/%dBits/", md_mixfreq, 8*sample_factor);
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121 if (md_mode & DMODE_STEREO) printf("stereo.\n");
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122 else printf("mono.\n");
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123
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124
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125 audiobuffer = (char*) MyMalloc(sgi_fragsize * sizeof(char));
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126
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127 if(audiobuffer==NULL){
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128 VC_Exit();
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129 return 0;
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130 }
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131
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132 return 1;
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133 }
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134
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135
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136 static void SGI_Exit(void)
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137 {
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138 free(audiobuffer);
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139 VC_Exit();
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140 }
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141
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142
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143 static void SGI_Update(void)
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144 {
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145 VC_WriteBytes(audiobuffer, sgi_fragsize);
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146 ALwritesamps(sgi_port,audiobuffer, sgi_fragsize/sample_factor);
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147 }
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148
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149
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150 DRIVER drv_sgi={
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151 NULL,
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152 "SGI Audio System",
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153 "SGI Audio System Driver v0.2 - by Stephan Kanthak",
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154 SGI_IsThere,
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155 VC_SampleLoad,
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156 VC_SampleUnload,
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157 VC_SampleSpace,
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158 VC_SampleLength,
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159 SGI_Init,
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160 SGI_Exit,
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161 VC_SetNumChannels,
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162 VC_PlayStart,
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163 VC_PlayStop,
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164 SGI_Update,
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165 VC_VoiceSetVolume,
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166 VC_VoiceSetFrequency,
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167 VC_VoiceSetPanning,
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168 VC_VoicePlay,
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169 VC_VoiceStop,
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170 VC_VoiceStopped,
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171 VC_VoiceReleaseSustain,
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172 VC_VoiceGetPosition,
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173 VC_RealVolume
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174 };
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