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9
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1 /*
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2
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3 Name:
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4 DRV_VOX.C
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5
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6 Description:
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7 Mikmod driver for output on linux and FreeBSD Open Sound System (OSS)
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8 (/dev/dsp)
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9
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10 Portability: VoxWare/SS/OSS land. Linux, FreeBSD (NetBSD & SCO?)
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11
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12 New fragment configuration code done by Rao:
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13 ============================================
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14
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15 You can use the environment variables 'MM_FRAGSIZE' and 'MM_NUMFRAGS' to
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16 override the default size & number of audio buffer fragments. If you
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17 experience crackles & pops, try experimenting with these values.
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18
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19 Read experimental.txt within the VoxWare package for information on these
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20 options. They are _VERY_ important with relation to sound popping and smooth
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21 playback.
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22
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23 In general, the slower your system, the higher these values need to be.
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24
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25 MM_NUMFRAGS is within the range 2 to 255 (decimal)
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26
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27 MM_FRAGSIZE is is within the range 7 to 17 (dec). The requested fragment size
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28 will be 2^MM_FRAGSIZE
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29
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30 - This driver DOES work with MikMod 3.0
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31 - modifed to use an ioctl() to figure out how much data to do with
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32 each write, keeps us from blocking extensivly
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33
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34 */
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35 #include <stdio.h>
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36 #include <stdlib.h>
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37 #include <unistd.h>
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38 #include <sys/types.h>
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39 #include <sys/time.h>
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40 #include <sys/stat.h>
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41 #include <fcntl.h>
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42 #ifdef __FreeBSD__
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43 #include <machine/soundcard.h>
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44 #else
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45 #include <sys/soundcard.h>
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46 #endif /* __FreeBSD__ */
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47 #include <sys/ioctl.h>
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48 #include <sys/wait.h>
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49 #include "mikmod.h"
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50 #include "mmio.h"
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51
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52 #define DEFAULT_FRAGSIZE 17
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53 #define DEFAULT_NUMFRAGS 4
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54
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55 static int sndfd;
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56 static int fragmentsize;
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57 static char* audiobuffer;
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58
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59
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60 static BOOL OSS_IsThere(void)
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61 {
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62 return (access("/dev/dsp",W_OK)==0);
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63 }
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64
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65
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66 static BOOL OSS_Init(void)
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67 {
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68 char *env;
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69 int play_precision,play_stereo,play_rate;
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70 int fragsize,numfrags;
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71
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72 if((sndfd=open("/dev/dsp",O_WRONLY))<0){
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73 return 1;
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74 }
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75
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76 fragsize=(env=getenv("MM_FRAGSIZE")) ? atoi(env) : DEFAULT_FRAGSIZE;
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77 numfrags=(env=getenv("MM_NUMFRAGS")) ? atoi(env) : DEFAULT_NUMFRAGS;
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78
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79 if(fragsize<7 || fragsize>17) fragsize=DEFAULT_FRAGSIZE;
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80 if(numfrags<2 || numfrags>255) numfrags=DEFAULT_NUMFRAGS;
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81
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82 fragmentsize=(numfrags<<16) | fragsize;
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83
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84 #ifndef __FreeBSD__
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85 if(ioctl(sndfd, SNDCTL_DSP_SETFRAGMENT, &fragmentsize)<0){
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86 close(sndfd);
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87 return 1;
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88 }
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89 #endif /* __FreeBSD__ */
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90
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91 play_precision = (md_mode & DMODE_16BITS) ? 16 : 8;
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92 play_stereo= (md_mode & DMODE_STEREO) ? 1 : 0;
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93 play_rate=md_mixfreq;
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94
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95 if(ioctl(sndfd, SNDCTL_DSP_SAMPLESIZE, &play_precision) == -1 ||
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96 ioctl(sndfd, SNDCTL_DSP_STEREO, &play_stereo) == -1 ||
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97 ioctl(sndfd, SNDCTL_DSP_SPEED, &play_rate) == -1){
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98 close(sndfd);
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99 return 1;
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100 }
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101
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102 ioctl(sndfd, SNDCTL_DSP_GETBLKSIZE, &fragmentsize);
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103
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104 /* Lose this for now - it will confuse ncurses etc...
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105 printf("Fragment size is %ld\n",fragmentsize); */
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106
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107 if(VC_Init()){
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108 close(sndfd);
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109 return 1;
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110 }
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111
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112 audiobuffer = (char*) _mm_malloc(fragmentsize * sizeof(char) * 2);
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113
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114 if(audiobuffer==NULL){
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115 VC_Exit();
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116 close(sndfd);
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117 return 1;
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118 }
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119
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120 return 0;
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121 }
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122
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123
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124 static void OSS_Exit(void)
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125 {
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126 free(audiobuffer);
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127 VC_Exit();
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128 close(sndfd);
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129 }
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130
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131
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132 static void OSS_Update(void)
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133 {
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134 audio_buf_info buffinf;
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135 ioctl(sndfd, SNDCTL_DSP_GETOSPACE, &buffinf);
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136 VC_WriteBytes(audiobuffer,buffinf.fragments*buffinf.fragsize);
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137 write(sndfd,audiobuffer,buffinf.fragments*buffinf.fragsize);
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138 }
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139
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140 BOOL OSS_Reset(void)
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141 {
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142 ioctl(sndfd, SNDCTL_DSP_RESET);
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143 VC_Exit();
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144 return VC_Init();
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145 }
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146
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147
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148 MDRIVER drv_oss =
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149 {
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150 NULL,
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151 "Open Sound System (OSS)",
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152 "Open Sound System (OSS) Driver v1.3 - by Rao & MikMak (with a little hacking from Pete)",
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153 0,255,
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154 OSS_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 OSS_Init,
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160 OSS_Exit,
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161 OSS_Reset,
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162 VC_SetNumVoices,
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163 VC_PlayStart,
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164 VC_PlayStop,
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165 OSS_Update,
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166 VC_VoiceSetVolume,
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167 VC_VoiceSetFrequency,
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168 VC_VoiceSetPanning,
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169 VC_VoicePlay,
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170 VC_VoiceStop,
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171 VC_VoiceStopped,
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172 VC_VoiceReleaseSustain,
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173 VC_VoiceGetPosition,
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174 VC_VoiceRealVolume
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175 };
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