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https://github.com/id-Software/Quake.git
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The Quake sources as originally release under the GPL license on December 21, 1999
This commit is contained in:
Travis Bradshaw
269
WinQuake/snd_linux.c
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269
WinQuake/snd_linux.c
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/*
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Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <sys/shm.h>
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#include <sys/wait.h>
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#include <linux/soundcard.h>
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#include <stdio.h>
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#include "quakedef.h"
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int audio_fd;
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int snd_inited;
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static int tryrates[] = { 11025, 22051, 44100, 8000 };
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qboolean SNDDMA_Init(void)
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{
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int rc;
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int fmt;
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int tmp;
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int i;
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char *s;
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struct audio_buf_info info;
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int caps;
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snd_inited = 0;
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// open /dev/dsp, confirm capability to mmap, and get size of dma buffer
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audio_fd = open("/dev/dsp", O_RDWR);
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if (audio_fd < 0)
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{
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perror("/dev/dsp");
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Con_Printf("Could not open /dev/dsp\n");
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return 0;
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}
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rc = ioctl(audio_fd, SNDCTL_DSP_RESET, 0);
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if (rc < 0)
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{
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perror("/dev/dsp");
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Con_Printf("Could not reset /dev/dsp\n");
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close(audio_fd);
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return 0;
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}
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if (ioctl(audio_fd, SNDCTL_DSP_GETCAPS, &caps)==-1)
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{
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perror("/dev/dsp");
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Con_Printf("Sound driver too old\n");
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close(audio_fd);
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return 0;
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}
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if (!(caps & DSP_CAP_TRIGGER) || !(caps & DSP_CAP_MMAP))
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{
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Con_Printf("Sorry but your soundcard can't do this\n");
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close(audio_fd);
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return 0;
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}
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if (ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info)==-1)
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{
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perror("GETOSPACE");
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Con_Printf("Um, can't do GETOSPACE?\n");
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close(audio_fd);
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return 0;
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}
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shm = &sn;
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shm->splitbuffer = 0;
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// set sample bits & speed
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s = getenv("QUAKE_SOUND_SAMPLEBITS");
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if (s) shm->samplebits = atoi(s);
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else if ((i = COM_CheckParm("-sndbits")) != 0)
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shm->samplebits = atoi(com_argv[i+1]);
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if (shm->samplebits != 16 && shm->samplebits != 8)
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{
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ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &fmt);
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if (fmt & AFMT_S16_LE) shm->samplebits = 16;
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else if (fmt & AFMT_U8) shm->samplebits = 8;
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}
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s = getenv("QUAKE_SOUND_SPEED");
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if (s) shm->speed = atoi(s);
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else if ((i = COM_CheckParm("-sndspeed")) != 0)
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shm->speed = atoi(com_argv[i+1]);
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else
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{
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for (i=0 ; i<sizeof(tryrates)/4 ; i++)
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if (!ioctl(audio_fd, SNDCTL_DSP_SPEED, &tryrates[i])) break;
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shm->speed = tryrates[i];
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}
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s = getenv("QUAKE_SOUND_CHANNELS");
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if (s) shm->channels = atoi(s);
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else if ((i = COM_CheckParm("-sndmono")) != 0)
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shm->channels = 1;
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else if ((i = COM_CheckParm("-sndstereo")) != 0)
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shm->channels = 2;
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else shm->channels = 2;
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shm->samples = info.fragstotal * info.fragsize / (shm->samplebits/8);
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shm->submission_chunk = 1;
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// memory map the dma buffer
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shm->buffer = (unsigned char *) mmap(NULL, info.fragstotal
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* info.fragsize, PROT_WRITE, MAP_FILE|MAP_SHARED, audio_fd, 0);
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if (!shm->buffer || shm->buffer == (unsigned char *)-1)
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{
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perror("/dev/dsp");
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Con_Printf("Could not mmap /dev/dsp\n");
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close(audio_fd);
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return 0;
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}
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tmp = 0;
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if (shm->channels == 2)
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tmp = 1;
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rc = ioctl(audio_fd, SNDCTL_DSP_STEREO, &tmp);
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if (rc < 0)
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{
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perror("/dev/dsp");
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Con_Printf("Could not set /dev/dsp to stereo=%d", shm->channels);
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close(audio_fd);
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return 0;
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}
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if (tmp)
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shm->channels = 2;
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else
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shm->channels = 1;
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rc = ioctl(audio_fd, SNDCTL_DSP_SPEED, &shm->speed);
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if (rc < 0)
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{
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perror("/dev/dsp");
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Con_Printf("Could not set /dev/dsp speed to %d", shm->speed);
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close(audio_fd);
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return 0;
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}
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if (shm->samplebits == 16)
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{
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rc = AFMT_S16_LE;
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rc = ioctl(audio_fd, SNDCTL_DSP_SETFMT, &rc);
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if (rc < 0)
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{
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perror("/dev/dsp");
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Con_Printf("Could not support 16-bit data. Try 8-bit.\n");
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close(audio_fd);
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return 0;
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}
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}
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else if (shm->samplebits == 8)
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{
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rc = AFMT_U8;
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rc = ioctl(audio_fd, SNDCTL_DSP_SETFMT, &rc);
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if (rc < 0)
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{
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perror("/dev/dsp");
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Con_Printf("Could not support 8-bit data.\n");
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close(audio_fd);
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return 0;
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}
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}
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else
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{
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perror("/dev/dsp");
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Con_Printf("%d-bit sound not supported.", shm->samplebits);
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close(audio_fd);
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return 0;
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}
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// toggle the trigger & start her up
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tmp = 0;
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rc = ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &tmp);
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if (rc < 0)
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{
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perror("/dev/dsp");
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Con_Printf("Could not toggle.\n");
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close(audio_fd);
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return 0;
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}
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tmp = PCM_ENABLE_OUTPUT;
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rc = ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &tmp);
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if (rc < 0)
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{
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perror("/dev/dsp");
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Con_Printf("Could not toggle.\n");
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close(audio_fd);
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return 0;
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}
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shm->samplepos = 0;
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snd_inited = 1;
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return 1;
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}
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int SNDDMA_GetDMAPos(void)
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{
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struct count_info count;
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if (!snd_inited) return 0;
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if (ioctl(audio_fd, SNDCTL_DSP_GETOPTR, &count)==-1)
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{
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perror("/dev/dsp");
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Con_Printf("Uh, sound dead.\n");
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close(audio_fd);
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snd_inited = 0;
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return 0;
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}
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// shm->samplepos = (count.bytes / (shm->samplebits / 8)) & (shm->samples-1);
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// fprintf(stderr, "%d \r", count.ptr);
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shm->samplepos = count.ptr / (shm->samplebits / 8);
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return shm->samplepos;
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}
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void SNDDMA_Shutdown(void)
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{
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if (snd_inited)
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{
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close(audio_fd);
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snd_inited = 0;
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}
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}
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/*
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==============
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SNDDMA_Submit
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Send sound to device if buffer isn't really the dma buffer
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===============
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*/
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void SNDDMA_Submit(void)
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{
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}
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