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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_AF.C
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5
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6 Description:
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7 Mikmod driver for output on AF audio server.
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8
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9 Written by Roine Gustafsson <e93_rog@e.kth.se> Oct 25, 1995
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10
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11 Portability:
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12 Unixes running Digital AudioFile library, available from
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13 ftp://crl.dec.com/pub/DEC/AF
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14
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15 Usage:
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16 Run the audio server (Aaxp&, Amsb&, whatever)
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17 Set environment variable AUDIOFILE to something like 'mymachine:0'.
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18 Remember, stereo is default! See commandline switches.
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19
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20 I have a version which uses 2 computers for stereo.
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21 Contact me if you want it.
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22
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23 THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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24 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
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25 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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26 CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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27 LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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28 NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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29 CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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30
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31 History:
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32 ver 1.21 Bugfix: AFFragmentSize could end up uneven.
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33 Thanks to Marcus Sundberg <e94_msu@e.kth.se>
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34 ver 1.22 Compatibility: change "AFBuffer" to "audiobuffer"
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35 Steve McIntyre <stevem@chiark.greenend.org.uk>
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36 ver 1.30 Compatibility: Use new driver API
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37 Steve McIntyre <stevem@chiark.greenend.org.uk>
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38 */
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39
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40 #include <malloc.h>
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41 #include <stdlib.h>
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42 #include <AF/AFlib.h>
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43
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44 #include "mikmod.h"
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45
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46 /* Global variables */
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47
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48 SBYTE *audiobuffer;
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49 static int AFFragmentSize;
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50 AFAudioConn *AFaud;
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51 ATime AFtime;
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52 AC AFac;
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53 AFDeviceDescriptor *AFdesc;
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54
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55 BOOL AF_IsThere(void)
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56 {
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57
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58 /* I'll think of a detection routine ... somtime */
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59
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60 return 1;
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61
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62 }
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63
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64 BOOL AF_Init(void)
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65 {
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66 unsigned long mask;
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67 AFSetACAttributes attributes;
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68 int srate;
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69 ADevice device;
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70 unsigned int channels;
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71 AEncodeType type;
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72 char *server;
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73 int n;
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74
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75 AFaud = AFOpenAudioConn( "" );
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76 if ( AFaud == NULL ) {
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77 myerr="Cannot open sounddevice.";
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78 return 0;
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79 }
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80
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81 /* Search for a suitable device */
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82 device = -1;
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83 for ( n = 0; n < AFaud->ndevices; n++ ) {
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84 AFdesc = AAudioDeviceDescriptor( AFaud, n );
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85 if ( AFdesc->playNchannels == 2 && md_mode&DMODE_STEREO ) {
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86 device = n;
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87 break;
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88 }
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89 if ( AFdesc->playNchannels == 1 && !(md_mode&DMODE_STEREO) ) {
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90 device = n;
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91 break;
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92 }
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93 }
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94 if ( device == -1 ) {
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95 myerr="Cannot find suitable audio port!";
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96 AFCloseAudioConn( AFaud );
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97 return 0;
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98 }
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99
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100 attributes.preempt = Mix;
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101 attributes.start_timeout = 0;
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102 attributes.end_silence = 0;
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103 attributes.type = LIN16; /* In case of an 8bit device, the AF converts the 16 bit data to 8 bit */
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104 attributes.channels = (md_mode&DMODE_STEREO)? Stereo: Mono;
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105
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106 mask = ACPreemption | ACEncodingType | ACStartTimeout | ACEndSilence | ACChannels;
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107 AFac = AFCreateAC( AFaud, device, mask, &attributes );
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108 srate=AFac->device->playSampleFreq;
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109
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110 md_mode|=DMODE_16BITS; /* This driver only handles 16bits */
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111 AFFragmentSize = (srate/40)*8; /* Update 5 times/sec */
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112 md_mixfreq=srate; /* set mixing freq */
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113
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114 if ( md_mode & DMODE_STEREO ) {
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115 if ( ( audiobuffer = (SBYTE *)malloc( 2*2*AFFragmentSize ) ) == NULL ) {
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116 myerr="Out of memory!";
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117 AFCloseAudioConn( AFaud );
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118 return 0;
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119 }
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120
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121 } else {
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122 if ( ( audiobuffer = (SBYTE *)malloc( 2*AFFragmentSize ) ) == NULL ) {
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123 myerr="Out of memory!";
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124 AFCloseAudioConn( AFaud );
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125 return 0;
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126 }
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127 }
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128
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129 if ( !VC_Init() ) {
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130 AFCloseAudioConn( AFaud );
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131 free( audiobuffer );
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132 return 0;
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133 }
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134
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135 return 1;
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136 }
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137
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138 void AF_PlayStart( void )
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139 {
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140
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141 AFtime = AFGetTime( AFac );
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142 VC_PlayStart();
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143
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144 }
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145
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146
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147 void AF_Exit(void)
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148 {
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149
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150 VC_Exit();
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151 AFCloseAudioConn(AFaud);
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152 free( AFBuffer );
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153
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154 }
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155
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156 void AF_Update(void)
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157 {
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158
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159 UWORD *p,*l,*r;
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160 int i;
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161
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162
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163 VC_WriteBytes( AFBuffer, AFFragmentSize );
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164 if ( md_mode & DMODE_STEREO ) {
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165 AFPlaySamples( AFac, AFtime, AFFragmentSize, (unsigned char *)AFBuffer );
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166 AFtime+=AFFragmentSize/4;
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167 // while ( AFGetTime( AFac ) < AFtime-1000 );
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168 } else {
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169 AFPlaySamples( AFac, AFtime, AFFragmentSize, (unsigned char *)AFBuffer );
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170 AFtime+=AFFragmentSize/2;
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171 // while ( AFGetTime( AFac ) < AFtime-1000 );
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172 }
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173
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174 }
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175
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176
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177 DRIVER drv_AF={
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178 NULL,
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179 "AF driver",
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180 "MikMod AudioFile Driver v1.22",
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181 AF_IsThere,
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182 VC_SampleLoad,
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183 VC_SampleUnload,
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184 VC_SampleSpace,
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185 VC_SampleLength,
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186 AF_Init,
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187 AF_Exit,
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188 VC_SetNumChannels,
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189 AF_PlayStart,
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190 VC_PlayStop,
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191 AF_Update,
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192 VC_VoiceSetVolume,
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193 VC_VoiceSetFrequency,
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194 VC_VoiceSetPanning,
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195 VC_VoicePlay,
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196 VC_VoiceStop,
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197 VC_VoiceStopped,
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198 VC_VoiceReleaseSustain,
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199 VC_VoiceGetPosition,
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200 VC_RealVolume
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201 };
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