mirror of
https://git.code.sf.net/p/quake/quake2forge
synced 2024-12-12 13:42:21 +00:00
c64a5e828a
for quakeforge a long time ago that allows sound playback on machines that can't mmap /dev/dsp, like PowerPC machines. The original patch was archived at: http://www.geocrawler.com/mail/msg.php3?msg_id=4207733&list=856 The patch went in mostly smoothly, once I found where iD kept their sound code. Linux only at the moment, I haven't bothered to look at snd_*.c in any of the other OS directories. It works for me, in that it doesn't interfere with mmapping on my i386 machine, but I have no PPC machines to test that it actually does what it's supposed to, so YMMV.
370 lines
8.2 KiB
C
370 lines
8.2 KiB
C
/*
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Copyright (C) 1997-2001 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 <pthread.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 "../client/client.h"
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#include "../client/snd_loc.h"
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#define FRAGSIZEEXP 9
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#define FRAGSIZE (1<<FRAGSIZEEXP)
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#define AUDIOBUFFERSIZE 4096
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#define AUDIOBUFFERS 64
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static int audio_fd = -1;
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static volatile int snd_inited;
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static volatile int frags_sent;
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static int mmapped = 0;
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cvar_t *sndbits;
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cvar_t *sndspeed;
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cvar_t *sndchannels;
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cvar_t *snddevice;
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static int tryrates[] = { 11025, 22051, 44100, 48000, 8000 };
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static pthread_t audio;
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void * thesound(void * arg) {
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while (snd_inited) {
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write(audio_fd, dma.buffer + frags_sent * FRAGSIZE, FRAGSIZE);
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frags_sent++;
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frags_sent &= (dma.samples * (dma.samplebits/8) / FRAGSIZE) - 1;
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}
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pthread_exit(0L);
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}
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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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struct audio_buf_info info;
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int caps;
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extern uid_t saved_euid;
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if (snd_inited)
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return 1;
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snd_inited = 0;
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if (!snddevice)
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{
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sndbits = Cvar_Get("sndbits", "16", CVAR_ARCHIVE);
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sndspeed = Cvar_Get("sndspeed", "0", CVAR_ARCHIVE);
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sndchannels = Cvar_Get("sndchannels", "2", CVAR_ARCHIVE);
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snddevice = Cvar_Get("snddevice", "/dev/dsp", CVAR_ARCHIVE);
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}
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// open /dev/dsp, check capability to mmap, and get size of dma buffer
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if (audio_fd == -1)
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{
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seteuid(saved_euid);
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audio_fd = open(snddevice->string, O_RDWR);
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if (audio_fd == -1)
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{
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perror(snddevice->string);
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seteuid(getuid());
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Com_Printf("SNDDMA_Init: Could not open %s.\n", snddevice->string);
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return 0;
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}
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seteuid(getuid());
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}
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rc = ioctl(audio_fd, SNDCTL_DSP_RESET, 0);
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if (rc == -1)
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{
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perror(snddevice->string);
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Com_Printf("SNDDMA_Init: Could not reset %s.\n", snddevice->string);
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close(audio_fd);
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audio_fd = -1;
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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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|| !(caps & DSP_CAP_TRIGGER) || !(caps & DSP_CAP_MMAP)) {
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Com_Printf("SNDDMA_Init: Sound device does not support mmap");
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} else {
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if (ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info) == -1) {
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perror(snddevice->string);
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Com_Printf("SNDDMA_Init: Sound driver too old.\n");
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close(audio_fd);
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audio_fd = -1;
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return 0;
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} else
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mmapped = 1;
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}
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if (!(caps & DSP_CAP_TRIGGER) || !(caps & DSP_CAP_MMAP)) {
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if (!mmapped) {
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int frags = 2 << 16 | FRAGSIZEEXP;
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if (ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frags) == -1) {
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perror(snddevice->string);
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Com_Printf("SNDDMA_Init: Could not set sound fragments");
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/* NOMMAP - jaq
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Com_Printf("SNDDMA_Init: Sorry, but your soundcard doesn't support trigger or mmap. (%08x)\n", caps);
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*/
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close(audio_fd);
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audio_fd = -1;
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return 0;
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}
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}
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}
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/* NOMMAP - jaq
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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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Com_Printf("SNDDMA_Init: GETOSPACE ioctl failed.\n");
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close(audio_fd);
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audio_fd = -1;
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return 0;
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}
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*/
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// set sample bits & speed
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dma.samplebits = (int)sndbits->value;
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if (dma.samplebits != 16 && dma.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_NE) dma.samplebits = 16;
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else if (fmt & AFMT_U8) dma.samplebits = 8;
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}
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dma.speed = (int)sndspeed->value;
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if (!dma.speed)
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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]))
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break;
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dma.speed = tryrates[i];
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}
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dma.channels = (int)sndchannels->value;
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if (dma.channels < 1 || dma.channels > 2)
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dma.channels = 2;
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if (mmapped) {
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dma.samples = info.fragstotal * info.fragsize / (dma.samplebits/8);
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dma.submission_chunk = 1;
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// memory map the dma buffer
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if (!dma.buffer)
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dma.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 (!dma.buffer || dma.buffer == MAP_FAILED) {
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perror(snddevice->string);
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Com_Printf("SNDDMA_Init: Could not mmap %s.\n", snddevice->string);
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close(audio_fd);
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audio_fd = -1;
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return 0;
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}
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}
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tmp = 0;
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if (dma.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(snddevice->string);
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Com_Printf("SNDDMA_Init: Could not set %s to stereo=%d.", snddevice->string, dma.channels);
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close(audio_fd);
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audio_fd = -1;
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return 0;
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}
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if (tmp)
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dma.channels = 2;
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else
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dma.channels = 1;
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if (dma.samplebits == 16)
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{
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rc = AFMT_S16_NE;
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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(snddevice->string);
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Com_Printf("SNDDMA_Init: Could not support 16-bit data. Try 8-bit.\n");
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close(audio_fd);
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audio_fd = -1;
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return 0;
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}
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}
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else if (dma.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(snddevice->string);
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Com_Printf("SNDDMA_Init: Could not support 8-bit data.\n");
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close(audio_fd);
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audio_fd = -1;
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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(snddevice->string);
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Com_Printf("SNDDMA_Init: %d-bit sound not supported.", dma.samplebits);
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close(audio_fd);
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audio_fd = -1;
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return 0;
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}
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rc = ioctl(audio_fd, SNDCTL_DSP_SPEED, &dma.speed);
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if (rc < 0)
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{
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perror(snddevice->string);
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Com_Printf("SNDDMA_Init: Could not set %s speed to %d.", snddevice->string, dma.speed);
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close(audio_fd);
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audio_fd = -1;
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return 0;
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}
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// toggle the trigger & start her up
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if (!mmapped) {
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dma.submission_chunk = AUDIOBUFFERSIZE;
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dma.samples = AUDIOBUFFERS * dma.submission_chunk * dma.channels;
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dma.samplepos = 0;
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if ((dma.buffer = malloc(dma.samples * (dma.samplebits/8))) == 0) {
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perror(snddevice->string);
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Com_Printf("Could not allocate shm->buffer");
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close(audio_fd);
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audio_fd = -1;
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return 0;
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}
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snd_inited = 1;
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pthread_create(&audio, 0L, thesound, 0L);
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} else {
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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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perror(snddevice->string);
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Com_Printf("SNDDMA_Init: Could not toggle. (1)\n");
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close(audio_fd);
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audio_fd = -1;
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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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perror(snddevice->string);
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Com_Printf("SNDDMA_Init: Could not toggle. (2)\n");
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close(audio_fd);
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audio_fd = -1;
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return 0;
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}
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dma.samplepos = 0;
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snd_inited = 1;
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}
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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 (!mmapped)
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return (frags_sent * FRAGSIZE) / (dma.samplebits/8) + FRAGSIZE/16;
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if (ioctl(audio_fd, SNDCTL_DSP_GETOPTR, &count)==-1)
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{
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perror(snddevice->string);
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Com_Printf("SNDDMA_GetDMAPos: GETOPTR failed.\n");
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close(audio_fd);
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audio_fd = -1;
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snd_inited = 0;
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return 0;
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}
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// dma.samplepos = (count.bytes / (dma.samplebits / 8)) & (dma.samples-1);
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// fprintf(stderr, "%d \r", count.ptr);
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dma.samplepos = count.ptr / (dma.samplebits / 8);
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return dma.samplepos;
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}
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void SNDDMA_Shutdown(void) {
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#if 0
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if (snd_inited)
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{
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close(audio_fd);
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audio_fd = -1;
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snd_inited = 0;
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}
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#endif
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if (snd_inited) {
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if (!mmapped) {
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snd_inited = 0L;
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pthread_join(audio, 0L);
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if (dma.buffer) {
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free(dma.buffer);
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dma.buffer = 0L;
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}
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}
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/* FIXME: use munmap() ? */
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close(audio_fd);
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audio_fd = -1;
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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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void SNDDMA_BeginPainting (void)
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{
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}
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