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Rev | Author | Line No. | Line |
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5131 | clevermous | 1 | /* |
2 | Copyright (C) 1996-1997 Id Software, Inc. |
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3 | |||
4 | This program is free software; you can redistribute it and/or |
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5 | modify it under the terms of the GNU General Public License |
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6 | as published by the Free Software Foundation; either version 2 |
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7 | of the License, or (at your option) any later version. |
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8 | |||
9 | This program is distributed in the hope that it will be useful, |
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10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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12 | |||
13 | See the GNU General Public License for more details. |
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14 | |||
15 | You should have received a copy of the GNU General Public License |
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16 | along with this program; if not, write to the Free Software |
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17 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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18 | |||
19 | */ |
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20 | #include |
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21 | #include |
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22 | #include |
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23 | #include |
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24 | #include |
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25 | #include |
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26 | #include |
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27 | #include |
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28 | #include |
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29 | #include |
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30 | #include |
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31 | #include "quakedef.h" |
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32 | |||
33 | int audio_fd; |
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34 | int snd_inited; |
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35 | |||
36 | static int bufpos; |
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37 | static int wbufp; |
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38 | static audio_info_t info; |
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39 | |||
40 | #define BUFFER_SIZE 8192 |
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41 | |||
42 | unsigned char dma_buffer[BUFFER_SIZE]; |
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43 | unsigned char pend_buffer[BUFFER_SIZE]; |
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44 | int pending; |
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45 | |||
46 | static int lastwrite = 0; |
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47 | |||
48 | qboolean SNDDMA_Init(void) |
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49 | { |
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50 | int rc; |
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51 | int fmt; |
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52 | int tmp; |
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53 | int i; |
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54 | char *s; |
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55 | int caps; |
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56 | |||
57 | if (snd_inited) { |
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58 | printf("Sound already init'd\n"); |
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59 | return; |
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60 | } |
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61 | |||
62 | shm = &sn; |
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63 | shm->splitbuffer = 0; |
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64 | |||
65 | audio_fd = open("/dev/audio", O_WRONLY|O_NDELAY); |
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66 | |||
67 | if (audio_fd < 0) { |
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68 | if (errno == EBUSY) { |
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69 | Con_Printf("Audio device is being used by another process\n"); |
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70 | } |
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71 | perror("/dev/audio"); |
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72 | Con_Printf("Could not open /dev/audio\n"); |
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73 | return (0); |
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74 | } |
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75 | |||
76 | if (ioctl(audio_fd, AUDIO_GETINFO, &info) < 0) { |
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77 | perror("/dev/audio"); |
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78 | Con_Printf("Could not communicate with audio device.\n"); |
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79 | close(audio_fd); |
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80 | return 0; |
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81 | } |
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82 | |||
83 | // |
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84 | // set to nonblock |
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85 | // |
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86 | if (fcntl(audio_fd, F_SETFL, O_NONBLOCK) < 0) { |
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87 | perror("/dev/audio"); |
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88 | close(audio_fd); |
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89 | return 0; |
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90 | } |
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91 | |||
92 | AUDIO_INITINFO(&info); |
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93 | |||
94 | shm->speed = 11025; |
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95 | |||
96 | // try 16 bit stereo |
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97 | info.play.encoding = AUDIO_ENCODING_LINEAR; |
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98 | info.play.sample_rate = 11025; |
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99 | info.play.channels = 2; |
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100 | info.play.precision = 16; |
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101 | |||
102 | if (ioctl(audio_fd, AUDIO_SETINFO, &info) < 0) { |
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103 | info.play.encoding = AUDIO_ENCODING_LINEAR; |
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104 | info.play.sample_rate = 11025; |
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105 | info.play.channels = 1; |
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106 | info.play.precision = 16; |
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107 | if (ioctl(audio_fd, AUDIO_SETINFO, &info) < 0) { |
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108 | Con_Printf("Incapable sound hardware.\n"); |
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109 | close(audio_fd); |
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110 | return 0; |
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111 | } |
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112 | Con_Printf("16 bit mono sound initialized\n"); |
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113 | shm->samplebits = 16; |
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114 | shm->channels = 1; |
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115 | } else { // 16 bit stereo |
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116 | Con_Printf("16 bit stereo sound initialized\n"); |
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117 | shm->samplebits = 16; |
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118 | shm->channels = 2; |
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119 | } |
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120 | |||
121 | shm->soundalive = true; |
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122 | shm->samples = sizeof(dma_buffer) / (shm->samplebits/8); |
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123 | shm->samplepos = 0; |
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124 | shm->submission_chunk = 1; |
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125 | shm->buffer = (unsigned char *)dma_buffer; |
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126 | |||
127 | snd_inited = 1; |
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128 | |||
129 | return 1; |
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130 | } |
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131 | |||
132 | int SNDDMA_GetDMAPos(void) |
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133 | { |
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134 | if (!snd_inited) |
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135 | return (0); |
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136 | |||
137 | if (ioctl(audio_fd, AUDIO_GETINFO, &info) < 0) { |
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138 | perror("/dev/audio"); |
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139 | Con_Printf("Could not communicate with audio device.\n"); |
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140 | close(audio_fd); |
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141 | snd_inited = 0; |
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142 | return (0); |
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143 | } |
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144 | |||
145 | return ((info.play.samples*shm->channels) % shm->samples); |
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146 | } |
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147 | |||
148 | int SNDDMA_GetSamples(void) |
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149 | { |
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150 | if (!snd_inited) |
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151 | return (0); |
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152 | |||
153 | if (ioctl(audio_fd, AUDIO_GETINFO, &info) < 0) { |
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154 | perror("/dev/audio"); |
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155 | Con_Printf("Could not communicate with audio device.\n"); |
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156 | close(audio_fd); |
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157 | snd_inited = 0; |
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158 | return (0); |
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159 | } |
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160 | |||
161 | return info.play.samples; |
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162 | } |
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163 | |||
164 | void SNDDMA_Shutdown(void) |
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165 | { |
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166 | if (snd_inited) { |
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167 | close(audio_fd); |
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168 | snd_inited = 0; |
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169 | } |
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170 | } |
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171 | |||
172 | /* |
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173 | ============== |
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174 | SNDDMA_Submit |
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175 | |||
176 | Send sound to device if buffer isn't really the dma buffer |
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177 | =============== |
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178 | */ |
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179 | void SNDDMA_Submit(void) |
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180 | { |
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181 | int samps; |
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182 | int bsize; |
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183 | int bytes, b; |
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184 | static unsigned char writebuf[1024]; |
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185 | unsigned char *p; |
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186 | int idx; |
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187 | int stop = paintedtime; |
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188 | extern int soundtime; |
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189 | |||
190 | if (paintedtime < wbufp) |
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191 | wbufp = 0; // reset |
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192 | |||
193 | bsize = shm->channels * (shm->samplebits/8); |
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194 | bytes = (paintedtime - wbufp) * bsize; |
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195 | |||
196 | if (!bytes) |
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197 | return; |
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198 | |||
199 | if (bytes > sizeof(writebuf)) { |
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200 | bytes = sizeof(writebuf); |
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201 | stop = wbufp + bytes/bsize; |
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202 | } |
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203 | |||
204 | p = writebuf; |
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205 | idx = (wbufp*bsize) & (BUFFER_SIZE - 1); |
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206 | |||
207 | for (b = bytes; b; b--) { |
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208 | *p++ = dma_buffer[idx]; |
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209 | idx = (idx + 1) & (BUFFER_SIZE - 1); |
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210 | } |
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211 | |||
212 | wbufp = stop; |
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213 | |||
214 | if (write(audio_fd, writebuf, bytes) < bytes) |
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215 | printf("audio can't keep up!\n"); |
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216 | |||
217 | }>>>>>>>>> |
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218 |