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https://git.code.sf.net/p/quake/newtree
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alsa sound support for linux. added now in anticipation of autoconf
This commit is contained in:
Bill Currie
parent
00f00185f8
commit
fa198d11f3
1 changed files with 319 additions and 0 deletions
319
source/snd_alsa.c
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319
source/snd_alsa.c
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/*
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snd_alsa.c
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(description)
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Copyright (C) 1999,2000 contributors of the QuakeForge project
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Please see the file "AUTHORS" for a list of contributors
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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:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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$Id$
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*/
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#include <config.h>
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#include <qtypes.h>
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#include <sound.h>
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#include <qargs.h>
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#include <console.h>
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <fcntl.h>
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#include <sys/types.h>
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#ifdef HAVE_SYS_IOCTL_H
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# include <sys/ioctl.h>
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#endif
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#ifdef HAVE_SYS_MMAN_H
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# include <sys/mman.h>
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#endif
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#if defined HAVE_SYS_SOUNDCARD_H
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# include <sys/soundcard.h>
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#elif defined HAVE_LINUX_SOUNDCARD_H
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# include <linux/soundcard.h>
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#elif HAVE_MACHINE_SOUNDCARD_H
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# include <machine/soundcard.h>
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#endif
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#include <sys/asoundlib.h>
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#ifndef MAP_FAILED
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# define MAP_FAILED ((void*)-1)
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#endif
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static int snd_inited;
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static snd_pcm_t *pcm_handle;
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static struct snd_pcm_channel_info cinfo;
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static struct snd_pcm_channel_params params;
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static struct snd_pcm_channel_setup setup;
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static snd_pcm_mmap_control_t *mmap_control = NULL;
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static char *mmap_data = NULL;
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static int card=-1,dev=-1;
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int check_card(int card)
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{
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snd_ctl_t *handle;
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snd_ctl_hw_info_t info;
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int rc;
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if ((rc = snd_ctl_open(&handle, card)) < 0) {
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Con_Printf("Error: control open (%i): %s\n", card, snd_strerror(rc));
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return rc;
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}
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if ((rc = snd_ctl_hw_info(handle, &info)) < 0) {
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Con_Printf("Error: control hardware info (%i): %s\n", card,
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snd_strerror(rc));
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snd_ctl_close(handle);
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return rc;
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}
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snd_ctl_close(handle);
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if (dev==-1) {
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for (dev = 0; dev < info.pcmdevs; dev++) {
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if ((rc=snd_pcm_open(&pcm_handle,card,dev,
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SND_PCM_OPEN_PLAYBACK
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| SND_PCM_OPEN_NONBLOCK))==0) {
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return 0;
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}
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}
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} else {
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if (dev>=0 && dev <info.pcmdevs) {
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if ((rc=snd_pcm_open(&pcm_handle,card,dev,
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SND_PCM_OPEN_PLAYBACK
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| SND_PCM_OPEN_NONBLOCK))==0) {
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return 0;
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}
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}
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}
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return 1;
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}
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qboolean SNDDMA_Init(void)
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{
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int rc=0,i;
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char *err_msg="";
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int rate,format,bps,stereo,frag_size;
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unsigned int mask;
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mask = snd_cards_mask();
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if (!mask) {
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Con_Printf("No sound cards detected\n");
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return 0;
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}
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if ((i=COM_CheckParm("-sndcard"))!=0) {
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card=atoi(com_argv[i+1]);
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}
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if ((i=COM_CheckParm("-snddev"))!=0) {
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dev=atoi(com_argv[i+1]);
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}
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if (card==-1) {
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for (card=0; card<SND_CARDS; card++) {
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if (!(mask & (1<<card)))
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continue;
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rc=check_card(card);
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if (rc<0)
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return 0;
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if (!rc)
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goto dev_openned;
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}
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} else {
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if (dev==-1) {
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rc=check_card(card);
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if (rc<0)
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return 0;
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if (!rc)
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goto dev_openned;
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} else {
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if ((rc=snd_pcm_open(&pcm_handle,card,dev,
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SND_PCM_OPEN_PLAYBACK
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| SND_PCM_OPEN_NONBLOCK))<0) {
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Con_Printf("Error: audio open error: %s\n", snd_strerror(rc));
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return 0;
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}
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goto dev_openned;
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}
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}
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Con_Printf("Error: audio open error: %s\n", snd_strerror(rc));
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return 0;
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dev_openned:
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Con_Printf("Using card %d, device %d.\n", card, dev);
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memset(&cinfo, 0, sizeof(cinfo));
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cinfo.channel = SND_PCM_CHANNEL_PLAYBACK;
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snd_pcm_channel_info(pcm_handle, &cinfo);
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Con_Printf("%08x %08x %08x\n",cinfo.flags,cinfo.formats,cinfo.rates);
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if (cinfo.rates & SND_PCM_RATE_44100) {
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rate=44100;
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frag_size=512; /* assuming stereo 8 bit */
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} else if (cinfo.rates & SND_PCM_RATE_22050) {
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rate=22050;
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frag_size=256; /* assuming stereo 8 bit */
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} else if (cinfo.rates & SND_PCM_RATE_11025) {
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rate=11025;
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frag_size=128; /* assuming stereo 8 bit */
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} else {
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Con_Printf("ALSA: desired rates not supported\n");
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goto error_2;
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}
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if (cinfo.formats & SND_PCM_FMT_S16_LE) {
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format=SND_PCM_SFMT_S16_LE;
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bps=16;
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frag_size*=2;
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} else if (cinfo.formats & SND_PCM_FMT_U8) {
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format=SND_PCM_SFMT_U8;
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bps=8;
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} else {
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Con_Printf("ALSA: desired formats not supported\n");
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goto error_2;
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}
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if (cinfo.max_voices>=2) {
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stereo=1;
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} else {
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stereo=0;
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frag_size/=2;
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}
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// err_msg="audio flush";
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// if ((rc=snd_pcm_channel_flush(pcm_handle, SND_PCM_CHANNEL_PLAYBACK))<0)
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// goto error;
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err_msg="audio munmap";
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if ((rc=snd_pcm_munmap(pcm_handle, SND_PCM_CHANNEL_PLAYBACK))<0)
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goto error;
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memset(¶ms, 0, sizeof(params));
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params.channel = SND_PCM_CHANNEL_PLAYBACK;
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params.mode = SND_PCM_MODE_BLOCK;
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params.format.interleave=1;
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params.format.format=format;
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params.format.rate=rate;
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params.format.voices=stereo+1;
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params.start_mode = SND_PCM_START_GO;
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params.stop_mode = SND_PCM_STOP_ROLLOVER;
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params.buf.block.frag_size=frag_size;
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params.buf.block.frags_min=1;
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params.buf.block.frags_max=-1;
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// err_msg="audio flush";
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// if ((rc=snd_pcm_channel_flush(pcm_handle, SND_PCM_CHANNEL_PLAYBACK))<0)
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// goto error;
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err_msg="audio params";
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if ((rc=snd_pcm_channel_params(pcm_handle, ¶ms))<0)
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goto error;
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err_msg="audio mmap";
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if ((rc=snd_pcm_mmap(pcm_handle, SND_PCM_CHANNEL_PLAYBACK, &mmap_control, (void **)&mmap_data))<0)
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goto error;
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err_msg="audio prepare";
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if ((rc=snd_pcm_plugin_prepare(pcm_handle, SND_PCM_CHANNEL_PLAYBACK))<0)
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goto error;
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memset(&setup, 0, sizeof(setup));
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setup.mode = SND_PCM_MODE_BLOCK;
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setup.channel = SND_PCM_CHANNEL_PLAYBACK;
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err_msg="audio setup";
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if ((rc=snd_pcm_channel_setup(pcm_handle, &setup))<0)
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goto error;
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shm=&sn;
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memset((dma_t*)shm,0,sizeof(*shm));
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shm->splitbuffer = 0;
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shm->channels=setup.format.voices;
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shm->submission_chunk=128; // don't mix less than this #
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shm->samplepos=0; // in mono samples
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shm->samplebits=setup.format.format==SND_PCM_SFMT_S16_LE?16:8;
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shm->samples=setup.buf.block.frags*setup.buf.block.frag_size/(shm->samplebits/8); // mono samples in buffer
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shm->speed=setup.format.rate;
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shm->buffer=(unsigned char*)mmap_data;
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Con_Printf("%5d stereo\n", shm->channels - 1);
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Con_Printf("%5d samples\n", shm->samples);
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Con_Printf("%5d samplepos\n", shm->samplepos);
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Con_Printf("%5d samplebits\n", shm->samplebits);
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Con_Printf("%5d submission_chunk\n", shm->submission_chunk);
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Con_Printf("%5d speed\n", shm->speed);
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Con_Printf("0x%x dma buffer\n", (int)shm->buffer);
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Con_Printf("%5d total_channels\n", total_channels);
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snd_inited=1;
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return 1;
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error:
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Con_Printf("Error: %s: %s\n", err_msg, snd_strerror(rc));
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error_2:
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snd_pcm_close(pcm_handle);
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return 0;
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}
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int SNDDMA_GetDMAPos(void)
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{
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if (!snd_inited) return 0;
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shm->samplepos=(mmap_control->status.frag_io+1)*setup.buf.block.frag_size/(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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snd_pcm_close(pcm_handle);
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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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int count=paintedtime-soundtime;
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int i,s,e;
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int rc;
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count+=setup.buf.block.frag_size-1;
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count/=setup.buf.block.frag_size;
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s=soundtime/setup.buf.block.frag_size;
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e=s+count;
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for (i=s; i<e; i++)
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mmap_control->fragments[i % setup.buf.block.frags].data=1;
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switch (mmap_control->status.status) {
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case SND_PCM_STATUS_PREPARED:
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if ((rc=snd_pcm_channel_go(pcm_handle, SND_PCM_CHANNEL_PLAYBACK))<0) {
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fprintf(stderr, "unable to start playback. %s\n",
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snd_strerror(rc));
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exit(1);
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}
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break;
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case SND_PCM_STATUS_RUNNING:
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break;
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case SND_PCM_STATUS_UNDERRUN:
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if ((rc=snd_pcm_plugin_prepare(pcm_handle, SND_PCM_CHANNEL_PLAYBACK))<0) {
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fprintf(stderr, "underrun: playback channel prepare error. %s\n",
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snd_strerror(rc));
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exit(1);
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}
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break;
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default:
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break;
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}
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}
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