1 #include <unistd.h>
2 #include <fcntl.h>
3 #include <stdlib.h>
4 #include <sys/types.h>
5 #include <sys/ioctl.h>
6 #include <sys/mman.h>
7 #include <sys/shm.h>
8 #include <sys/wait.h>
9 #include <linux/soundcard.h>
10 #include <stdio.h>
11 #include "quakedef.h"
12
13 int audio_fd;
14 int snd_inited;
15
16 static int tryrates[] = { 11025, 22051, 44100, 8000 };
17
SNDDMA_Init(void)18 qboolean SNDDMA_Init(void)
19 {
20
21 int rc;
22 int fmt;
23 int tmp;
24 int i;
25 char *s;
26 struct audio_buf_info info;
27 int caps;
28
29 snd_inited = 0;
30
31 // open /dev/dsp, confirm capability to mmap, and get size of dma buffer
32
33 audio_fd = open("/dev/dsp", O_RDWR);
34 if (audio_fd < 0)
35 {
36 perror("/dev/dsp");
37 Con_Printf("Could not open /dev/dsp\n");
38 return 0;
39 }
40
41 rc = ioctl(audio_fd, SNDCTL_DSP_RESET, 0);
42 if (rc < 0)
43 {
44 perror("/dev/dsp");
45 Con_Printf("Could not reset /dev/dsp\n");
46 close(audio_fd);
47 return 0;
48 }
49
50 if (ioctl(audio_fd, SNDCTL_DSP_GETCAPS, &caps)==-1)
51 {
52 perror("/dev/dsp");
53 Con_Printf("Sound driver too old\n");
54 close(audio_fd);
55 return 0;
56 }
57
58 if (!(caps & DSP_CAP_TRIGGER) || !(caps & DSP_CAP_MMAP))
59 {
60 Con_Printf("Sorry but your soundcard can't do this\n");
61 close(audio_fd);
62 return 0;
63 }
64
65 if (ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info)==-1)
66 {
67 perror("GETOSPACE");
68 Con_Printf("Um, can't do GETOSPACE?\n");
69 close(audio_fd);
70 return 0;
71 }
72
73 shm = &sn;
74 shm->splitbuffer = 0;
75
76 // set sample bits & speed
77
78 s = getenv("QUAKE_SOUND_SAMPLEBITS");
79 if (s) shm->samplebits = atoi(s);
80 else if ((i = COM_CheckParm("-sndbits")) != 0)
81 shm->samplebits = atoi(com_argv[i+1]);
82 if (shm->samplebits != 16 && shm->samplebits != 8)
83 {
84 ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &fmt);
85 if (fmt & AFMT_S16_LE) shm->samplebits = 16;
86 else if (fmt & AFMT_U8) shm->samplebits = 8;
87 }
88
89 s = getenv("QUAKE_SOUND_SPEED");
90 if (s) shm->speed = atoi(s);
91 else if ((i = COM_CheckParm("-sndspeed")) != 0)
92 shm->speed = atoi(com_argv[i+1]);
93 else
94 {
95 for (i=0 ; i<sizeof(tryrates)/4 ; i++)
96 if (!ioctl(audio_fd, SNDCTL_DSP_SPEED, &tryrates[i])) break;
97 shm->speed = tryrates[i];
98 }
99
100 s = getenv("QUAKE_SOUND_CHANNELS");
101 if (s) shm->channels = atoi(s);
102 else if ((i = COM_CheckParm("-sndmono")) != 0)
103 shm->channels = 1;
104 else if ((i = COM_CheckParm("-sndstereo")) != 0)
105 shm->channels = 2;
106 else shm->channels = 2;
107
108 shm->samples = info.fragstotal * info.fragsize / (shm->samplebits/8);
109 shm->submission_chunk = 1;
110
111 // memory map the dma buffer
112
113 shm->buffer = (unsigned char *) mmap(NULL, info.fragstotal
114 * info.fragsize, PROT_WRITE, MAP_FILE|MAP_SHARED, audio_fd, 0);
115 if (!shm->buffer)
116 {
117 perror("/dev/dsp");
118 Con_Printf("Could not mmap /dev/dsp\n");
119 close(audio_fd);
120 return 0;
121 }
122
123 tmp = 0;
124 if (shm->channels == 2)
125 tmp = 1;
126 rc = ioctl(audio_fd, SNDCTL_DSP_STEREO, &tmp);
127 if (rc < 0)
128 {
129 perror("/dev/dsp");
130 Con_Printf("Could not set /dev/dsp to stereo=%d", shm->channels);
131 close(audio_fd);
132 return 0;
133 }
134 if (tmp)
135 shm->channels = 2;
136 else
137 shm->channels = 1;
138
139 rc = ioctl(audio_fd, SNDCTL_DSP_SPEED, &shm->speed);
140 if (rc < 0)
141 {
142 perror("/dev/dsp");
143 Con_Printf("Could not set /dev/dsp speed to %d", shm->speed);
144 close(audio_fd);
145 return 0;
146 }
147
148 if (shm->samplebits == 16)
149 {
150 rc = AFMT_S16_LE;
151 rc = ioctl(audio_fd, SNDCTL_DSP_SETFMT, &rc);
152 if (rc < 0)
153 {
154 perror("/dev/dsp");
155 Con_Printf("Could not support 16-bit data. Try 8-bit.\n");
156 close(audio_fd);
157 return 0;
158 }
159 }
160 else if (shm->samplebits == 8)
161 {
162 rc = AFMT_U8;
163 rc = ioctl(audio_fd, SNDCTL_DSP_SETFMT, &rc);
164 if (rc < 0)
165 {
166 perror("/dev/dsp");
167 Con_Printf("Could not support 8-bit data.\n");
168 close(audio_fd);
169 return 0;
170 }
171 }
172 else
173 {
174 perror("/dev/dsp");
175 Con_Printf("%d-bit sound not supported.", shm->samplebits);
176 close(audio_fd);
177 return 0;
178 }
179
180 // toggle the trigger & start her up
181
182 tmp = 0;
183 rc = ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &tmp);
184 if (rc < 0)
185 {
186 perror("/dev/dsp");
187 Con_Printf("Could not toggle.\n");
188 close(audio_fd);
189 return 0;
190 }
191 tmp = PCM_ENABLE_OUTPUT;
192 rc = ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &tmp);
193 if (rc < 0)
194 {
195 perror("/dev/dsp");
196 Con_Printf("Could not toggle.\n");
197 close(audio_fd);
198 return 0;
199 }
200
201 shm->samplepos = 0;
202
203 snd_inited = 1;
204 return 1;
205
206 }
207
SNDDMA_GetDMAPos(void)208 int SNDDMA_GetDMAPos(void)
209 {
210
211 struct count_info count;
212
213 if (!snd_inited) return 0;
214
215 if (ioctl(audio_fd, SNDCTL_DSP_GETOPTR, &count)==-1)
216 {
217 perror("/dev/dsp");
218 Con_Printf("Uh, sound dead.\n");
219 close(audio_fd);
220 snd_inited = 0;
221 return 0;
222 }
223 // shm->samplepos = (count.bytes / (shm->samplebits / 8)) & (shm->samples-1);
224 // fprintf(stderr, "%d \r", count.ptr);
225 shm->samplepos = count.ptr / (shm->samplebits / 8);
226
227 return shm->samplepos;
228
229 }
230
SNDDMA_Shutdown(void)231 void SNDDMA_Shutdown(void)
232 {
233 if (snd_inited)
234 {
235 close(audio_fd);
236 snd_inited = 0;
237 }
238 }
239
240 /*
241 ==============
242 SNDDMA_Submit
243
244 Send sound to device if buffer isn't really the dma buffer
245 ===============
246 */
SNDDMA_Submit(void)247 void SNDDMA_Submit(void)
248 {
249 }
250
251