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3
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1 /*
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2 * paradise.sndsrv.c - VoxWare(tm) Compatible Sound - July 1996
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3 * This server is SunOS Specific.
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4 * Sujal M. Patel (smpatel@umiacs.umd.edu)
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5 *
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6 * Copyright (c) 1994-1996, Sujal M. Patel
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7 * All rights reserved.
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8 *
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9 * Redistribution and use in source and binary forms, with or without
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10 * modification, are permitted provided that the following conditions
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11 * are met:
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12 * 1. Redistributions of source code must retain the above copyright
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13 * notice, this list of conditions and the following disclaimer.
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14 * 2. Redistributions in binary form must reproduce the above copyright
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15 * notice, this list of conditions and the following disclaimer in the
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16 * documentation and/or other materials provided with the distribution.
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17 *
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18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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28 * SUCH DAMAGE.
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29 *
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30 * $Id: paradise.sndsrv.sun.c,v 1.1.1.1 1997/12/06 05:41:29 darius Exp $
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31 */
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32
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33
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34 #include <stdio.h>
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35 #include <stdlib.h>
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36 #include <unistd.h>
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37 #include <fcntl.h>
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38 #include <sys/ioctl.h>
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39 #include <sys/time.h>
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40 #include <signal.h>
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41 #include <string.h>
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42
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43 char *FILENAME[] = {
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44 "/explode.raw",
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45 "/cloak.raw",
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46 "/firetorp.raw",
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47 "/phaser.raw",
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48 "/plasma.raw",
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49 "/shield.raw",
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50 "/torphit.raw",
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51 "/explode_big.raw",
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52 "/paradise.raw",
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53 "/thermal.raw",
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54 "/redalert.raw"
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55 };
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56
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57 #define NUM_SOUNDS (sizeof(FILENAME)/sizeof(char*))
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58
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59 signed char *sound_buffer[NUM_SOUNDS];
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60 int sound_size[NUM_SOUNDS];
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61 int fragsize;
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62
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63
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64 /* Terminate: Signal Handler */
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65 void
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66 quit ()
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67 {
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68 exit (0);
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69 }
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70
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71
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72
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73 void
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74 init (int argc, char **argv)
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75 {
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76 int i;
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77 char s[1024];
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78
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79 if (argc != 3)
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80 {
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81 printf ("This program is only executed by Paradise\n");
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82 exit (1);
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83 }
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84
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85 for (i = 0; i < NUM_SOUNDS; i++)
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86 {
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87 s[0] = 0;
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88 strcat (s, argv[1]);
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89 if (s[(int) strlen (s) - 1] == '/')
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90 FILENAME[i]++;
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91 strcat (s, FILENAME[i]);
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92 FILENAME[i] = malloc ((int) strlen (s) + 1);
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93 strcpy (FILENAME[i], s);
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94 sound_buffer[i] = NULL;
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95 sound_size[i] = 0;
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96 }
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97
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98 signal (SIGTERM, quit); /* Setup Terminate Signal Handler */
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99 }
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100
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101
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102 /*
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103 Setup DSP: Opens /dev/audio
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104 Sets fragment size to 512
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105 Error checking
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106 */
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107 int
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108 setup_dsp (char *dspdev)
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109 {
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110 int dsp, frag, value;
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111 int mixer;
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112
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113 dsp = open (dspdev, O_RDWR);
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114 if (dsp < 1)
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115 {
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116 fprintf (stderr, "paradise.sndsrv: Couldn't open device %s\n", dspdev);
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117 return -1;
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118 }
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119
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120 fragsize = 512;
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121
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122 return dsp;
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123 }
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124
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125 /*
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126 This just keeps the pipe from breaking...
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127 Eventually I'll look at the paradise signal handlers and
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128 just trap this.
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129 */
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130 int
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131 do_nothing (void)
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132 {
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133 while (1)
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134 sleep (5);
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135 }
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136
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137 int
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138 read_sound (int k)
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139 {
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140 int i, fd, size;
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141
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142 /*fprintf(stderr,"loading sound %d, %s\n",k,FILENAME[k]); */
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143
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144 fd = open (FILENAME[k], O_RDONLY);
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145 if (fd <= 0)
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146 {
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147 fprintf (stderr, "paradise.sndsrv: The sound %s could not be opened\n", FILENAME[k]);
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148 sound_size[k] = -1;
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149 return (0);
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150 };
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151 size = lseek (fd, 0, SEEK_END);
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152 sound_size[k] = (size / fragsize) + 1; /*size in fragments */
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153 sound_buffer[k] = malloc (sound_size[k] * fragsize);
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154 if (sound_buffer[k] == NULL)
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155 {
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156 fprintf (stderr, "paradise.sndsrv: couldn't malloc memory for sound\n");
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157 sound_size[k] = -1;
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158 close (fd);
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159 return (0);
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160 };
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161 lseek (fd, 0, SEEK_SET);
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162 read (fd, sound_buffer[k], size);
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163 close (fd);
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164 for (i = 0; i < size; i++)
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165 sound_buffer[k][i] ^= 0x80;
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166 bzero (sound_buffer[k] + size, sound_size[k] * fragsize - size);
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167
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168 /*fprintf(stderr,"sound has been loaded, %d bytes\n",size); *//*DEBUG */
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169 return (1);
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170 }
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171
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172
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173 void
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174 do_everything (int dsp)
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175 {
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176 char k;
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177 int i, j;
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178 int terminate = -1; /* Which Sound to Terminate */
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179 int playing[16]; /* Sound numbers that we are playing */
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180 int position[16]; /* Current position in each sound file */
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181 int playnum = 0; /* Number of sounds currently being played */
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182 unsigned char final[512]; /* Final Mixing Buffer */
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183 int premix[512];
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184 char *sample;
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185
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186 for (;;)
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187 {
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188 terminate = -1;
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189 /* Try to open a new sound if we get an integer on the 'in' pipe */
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190 i = read (STDIN_FILENO, &k, sizeof (k));
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191 if (i == 0)
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192 { /* EOF on pipe means parent has closed its end */
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193 /*fprintf(stderr,"paradise.sndsrv: shutting down\n"); */
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194 kill (getpid (), SIGTERM);
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195 };
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196 if (i != -1)
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197 { /* there was something in the pipe */
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198 /*fprintf(stderr,"Just read a %d from pipe\n",(int)k); *//*DEBUG */
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199 /* Negative means terminate the FIRST sound in the buffer */
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200 if (k < 0)
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201 {
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202 /*fprintf(stderr,"terminating sound\n"); *//*DEBUG */
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203 terminate = 0;
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204 }
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205 else
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206 {
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207 if (sound_size[(int) k] == 0)
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208 read_sound (k);
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209 if (sound_size[(int) k] > 0 && playnum < 16)
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210 {
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211 position[playnum] = 0;
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212 playing[playnum++] = k;
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213 /*fprintf(stderr,"sound %d added to play queue\n",playnum-1); *//*DEBUG */
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214 };
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215 };
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216 };
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217
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218 /* terminate a sound if necessary */
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219 for (i = 0; i < playnum; i++)
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220 {
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221 if ((position[i] == sound_size[playing[i]]) || (terminate == i))
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222 {
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223 /*fprintf(stderr,"finished playing sound %d\n",i); *//*DEBUG */
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224 /*fprintf(stderr,"is was at position %d\n",position[i]); *//*DEBUG */
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225 bcopy (playing + i + 1, playing + i, (playnum - i) * sizeof (int));
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226 bcopy (position + i + 1, position + i, (playnum - i) * sizeof (int));
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227 playnum--;
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228 i--;
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229 };
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230 };
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231
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232 if (playnum)
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233 {
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234 /* Mix each sound into the final buffer */
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235 bzero (premix, sizeof (premix));
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236 for (i = 0; i < playnum; i++)
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237 {
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238 sample = sound_buffer[playing[i]] + position[i] * fragsize;
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239 for (j = 0; j < fragsize; j++)
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240 {
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241 premix[j] += *(sample + j);
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242 };
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243 position[i]++;
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244 };
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245 for (i = 0; i < fragsize; i++)
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246 final[i] = (premix[i] > 255) ? 255 : (premix[i] < -256 ? 0 : (premix[i] >> 1) + 128);
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247 }
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248 else
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249 {
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250 /*
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251 We have no sounds to play
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252 Just fill the buffer with silence and maybe play it
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253 */
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254 memset (final, 128, sizeof (final));
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255 };
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256 write (dsp, final, fragsize);
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257 /*
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258 The sound server is in a tight loop, EXCEPT for this
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259 write which blocks. Any optimizations in the above
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260 code would really be helpful. Right now the server
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261 takes up to 7% cpu on a 486DX/50.
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262 */
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263 }
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264 }
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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 main (argc, argv)
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270 int argc;
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271 char **argv;
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272 {
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273 int dsp;
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274
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275 fcntl (STDIN_FILENO, F_SETFL, O_NONBLOCK);
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276 init (argc, argv);
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277 dsp = setup_dsp (argv[2]);
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278
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279 if (dsp < 1)
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280 do_nothing ();
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281
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282 do_everything (dsp);
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283 }
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