2 Copyright (C) 1996-1997 Id Software, Inc.
4 This program is free software; you can redistribute it and/or
5 modify it under the terms of the GNU General Public License
6 as published by the Free Software Foundation; either version 2
7 of the License, or (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
13 See the GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 #include <sys/types.h>
24 #include <sys/ioctl.h>
28 #include <sys/soundcard.h>
35 static int tryrates[] = { 11025, 22051, 44100, 8000 };
37 qboolean SNDDMA_Init(void)
44 struct audio_buf_info info;
49 // open /dev/dsp, confirm capability to mmap, and get size of dma buffer
50 audio_fd = open("/dev/dsp", O_RDWR);
54 Con_Printf("Could not open /dev/dsp\n");
58 rc = ioctl(audio_fd, SNDCTL_DSP_RESET, 0);
62 Con_Printf("Could not reset /dev/dsp\n");
67 if (ioctl(audio_fd, SNDCTL_DSP_GETCAPS, &caps)==-1)
70 Con_Printf("Sound driver too old\n");
75 if (!(caps & DSP_CAP_TRIGGER) || !(caps & DSP_CAP_MMAP))
77 Con_Printf("Sorry but your soundcard can't do this\n");
82 if (ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info)==-1)
85 Con_Printf("Um, can't do GETOSPACE?\n");
93 // set sample bits & speed
94 s = getenv("QUAKE_SOUND_SAMPLEBITS");
96 shm->samplebits = atoi(s);
97 else if ((i = COM_CheckParm("-sndbits")) != 0)
98 shm->samplebits = atoi(com_argv[i+1]);
100 if (shm->samplebits != 16 && shm->samplebits != 8)
102 ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &fmt);
103 if (fmt & AFMT_S16_LE)
104 shm->samplebits = 16;
105 else if (fmt & AFMT_U8)
109 s = getenv("QUAKE_SOUND_SPEED");
111 shm->speed = atoi(s);
112 else if ((i = COM_CheckParm("-sndspeed")) != 0)
113 shm->speed = atoi(com_argv[i+1]);
116 for (i = 0;i < (int) sizeof(tryrates) / 4;i++)
117 if (!ioctl(audio_fd, SNDCTL_DSP_SPEED, &tryrates[i]))
120 shm->speed = tryrates[i];
123 s = getenv("QUAKE_SOUND_CHANNELS");
125 shm->channels = atoi(s);
126 else if ((i = COM_CheckParm("-sndmono")) != 0)
128 else if ((i = COM_CheckParm("-sndstereo")) != 0)
133 shm->samples = info.fragstotal * info.fragsize / (shm->samplebits/8);
134 shm->submission_chunk = 1;
136 // memory map the dma buffer
137 shm->buffer = (unsigned char *) mmap(NULL, info.fragstotal
138 * info.fragsize, PROT_READ|PROT_WRITE, MAP_FILE|MAP_SHARED, audio_fd, 0);
139 if (!shm->buffer || shm->buffer == (unsigned char *)-1)
142 Con_Printf("Could not mmap /dev/dsp\n");
148 if (shm->channels == 2)
151 rc = ioctl(audio_fd, SNDCTL_DSP_STEREO, &tmp);
155 Con_Printf("Could not set /dev/dsp to stereo=%d", shm->channels);
164 rc = ioctl(audio_fd, SNDCTL_DSP_SPEED, &shm->speed);
168 Con_Printf("Could not set /dev/dsp speed to %d", shm->speed);
173 if (shm->samplebits == 16)
176 rc = ioctl(audio_fd, SNDCTL_DSP_SETFMT, &rc);
180 Con_Printf("Could not support 16-bit data. Try 8-bit.\n");
185 else if (shm->samplebits == 8)
188 rc = ioctl(audio_fd, SNDCTL_DSP_SETFMT, &rc);
192 Con_Printf("Could not support 8-bit data.\n");
200 Con_Printf("%d-bit sound not supported.", shm->samplebits);
205 // toggle the trigger & start her up
207 rc = ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &tmp);
211 Con_Printf("Could not toggle.\n");
215 tmp = PCM_ENABLE_OUTPUT;
216 rc = ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &tmp);
220 Con_Printf("Could not toggle.\n");
231 int SNDDMA_GetDMAPos(void)
234 struct count_info count;
236 if (!snd_inited) return 0;
238 if (ioctl(audio_fd, SNDCTL_DSP_GETOPTR, &count)==-1)
241 Con_Printf("Uh, sound dead.\n");
246 shm->samplepos = count.ptr / (shm->samplebits / 8);
248 return shm->samplepos;
251 void SNDDMA_Shutdown(void)
264 Send sound to device if buffer isn't really the dma buffer
267 void SNDDMA_Submit(void)
271 void *S_LockBuffer(void)
276 void S_UnlockBuffer(void)