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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 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 |