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.
21 // OSS module, used by Linux and FreeBSD
26 #include <sys/types.h>
27 #include <sys/ioctl.h>
31 #include <sys/soundcard.h>
39 static int tryrates[] = {44100, 22050, 11025, 8000};
41 qboolean SNDDMA_Init(void)
48 struct audio_buf_info info;
52 #if BYTE_ORDER == BIG_ENDIAN
53 format16bit = AFMT_S16_BE;
55 format16bit = AFMT_S16_LE;
59 // open /dev/dsp, confirm capability to mmap, and get size of dma buffer
60 audio_fd = open("/dev/dsp", O_RDWR); // we have to open it O_RDWR for mmap
64 Con_Print("Could not open /dev/dsp\n");
68 if (ioctl(audio_fd, SNDCTL_DSP_RESET, 0) < 0)
71 Con_Print("Could not reset /dev/dsp\n");
76 if (ioctl(audio_fd, SNDCTL_DSP_GETCAPS, &caps)==-1)
79 Con_Print("Sound driver too old\n");
84 if (!(caps & DSP_CAP_TRIGGER) || !(caps & DSP_CAP_MMAP))
86 Con_Print("Sorry but your soundcard can't do this\n");
91 if (ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info)==-1)
94 Con_Print("Um, can't do GETOSPACE?\n");
99 // set sample bits & speed
100 s = getenv("QUAKE_SOUND_SAMPLEBITS");
102 shm->format.width = atoi(s) / 8;
103 // COMMANDLINEOPTION: Linux OSS Sound: -sndbits <bits> chooses 8 bit or 16 bit sound output
104 else if ((i = COM_CheckParm("-sndbits")) != 0)
105 shm->format.width = atoi(com_argv[i+1]) / 8;
107 if (shm->format.width != 2 && shm->format.width != 1)
109 ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &fmt);
110 if (fmt & format16bit)
111 shm->format.width = 2;
112 else if (fmt & AFMT_U8)
113 shm->format.width = 1;
116 s = getenv("QUAKE_SOUND_SPEED");
118 shm->format.speed = atoi(s);
119 // COMMANDLINEOPTION: Linux OSS Sound: -sndspeed <hz> chooses 44100 hz, 22100 hz, or 11025 hz sound output rate
120 else if ((i = COM_CheckParm("-sndspeed")) != 0)
121 shm->format.speed = atoi(com_argv[i+1]);
124 for (i = 0;i < (int) sizeof(tryrates) / (int) sizeof(tryrates[0]);i++)
125 if (!ioctl(audio_fd, SNDCTL_DSP_SPEED, &tryrates[i]))
128 shm->format.speed = tryrates[i];
131 s = getenv("QUAKE_SOUND_CHANNELS");
133 shm->format.channels = atoi(s);
134 // COMMANDLINEOPTION: Linux OSS Sound: -sndmono sets sound output to mono
135 else if ((i = COM_CheckParm("-sndmono")) != 0)
136 shm->format.channels = 1;
137 // COMMANDLINEOPTION: Linux OSS Sound: -sndstereo sets sound output to stereo
138 else // if ((i = COM_CheckParm("-sndstereo")) != 0)
139 shm->format.channels = 2;
141 tmp = (shm->format.channels == 2);
142 rc = ioctl(audio_fd, SNDCTL_DSP_STEREO, &tmp);
146 Con_Printf("Could not set /dev/dsp to stereo=%d\n", tmp);
151 rc = ioctl(audio_fd, SNDCTL_DSP_SPEED, &shm->format.speed);
155 Con_Printf("Could not set /dev/dsp speed to %d\n", shm->format.speed);
160 if (shm->format.width == 2)
163 rc = ioctl(audio_fd, SNDCTL_DSP_SETFMT, &rc);
167 Con_Print("Could not support 16-bit data. Try 8-bit.\n");
172 else if (shm->format.width == 1)
175 rc = ioctl(audio_fd, SNDCTL_DSP_SETFMT, &rc);
179 Con_Print("Could not support 8-bit data.\n");
187 Con_Printf("%d-bit sound not supported.\n", shm->format.width * 8);
192 shm->samples = info.fragstotal * info.fragsize / shm->format.width;
194 // memory map the dma buffer
195 shm->bufferlength = info.fragstotal * info.fragsize;
196 shm->buffer = (unsigned char *) mmap(NULL, shm->bufferlength, PROT_WRITE, MAP_FILE|MAP_SHARED, audio_fd, 0);
197 if (!shm->buffer || shm->buffer == (unsigned char *)-1)
200 Con_Print("Could not mmap /dev/dsp\n");
205 // toggle the trigger & start her up
207 rc = ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &tmp);
211 Con_Print("Could not toggle.\n");
215 tmp = PCM_ENABLE_OUTPUT;
216 rc = ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &tmp);
220 Con_Print("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_Print("Uh, sound dead.\n");
246 shm->samplepos = count.ptr / shm->format.width;
248 return shm->samplepos;
251 void SNDDMA_Shutdown(void)
257 munmap(shm->buffer, shm->bufferlength);
260 ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &tmp);
261 ioctl(audio_fd, SNDCTL_DSP_RESET, 0);
273 Send sound to device if buffer isn't really the dma buffer
276 void SNDDMA_Submit(void)
280 void *S_LockBuffer(void)
285 void S_UnlockBuffer(void)