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quakeforge-old/common/snd_alsa.c
Bill Currie 008039dd4f Improved device handling. By default, quake will now grovel around ALSA'a 
device list to find an available output device. This means that for systems
with multiple cards or a card with more than one playback device, quake and
another app can run at the same time (eg an mp3 player and quake)
2000-01-15 02:20:35 +00:00

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/*
Copyright (C) 1999,2000 contributors of the QuakeForge project
Please see the file "AUTHORS" for a list of contributors
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "quakedef.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#ifdef HAVE_SYS_IOCTL_H
# include <sys/ioctl.h>
#endif
#ifdef HAVE_SYS_MMAN_H
# include <sys/mman.h>
#endif
#if defined HAVE_SYS_SOUNDCARD_H
# include <sys/soundcard.h>
#elif defined HAVE_LINUX_SOUNDCARD_H
# include <linux/soundcard.h>
#elif HAVE_MACHINE_SOUNDCARD_H
# include <machine/soundcard.h>
#endif
#include <sys/asoundlib.h>
#ifndef MAP_FAILED
# define MAP_FAILED ((void*)-1)
#endif
static int snd_inited;
static snd_pcm_t *pcm_handle;
static struct snd_pcm_channel_info cinfo;
static struct snd_pcm_channel_params params;
static struct snd_pcm_channel_setup setup;
static snd_pcm_mmap_control_t *mmap_control = NULL;
static char *mmap_data = NULL;
static int card=-1,dev=-1;
int check_card(int card)
{
snd_ctl_t *handle;
snd_ctl_hw_info_t info;
int rc;
if ((rc = snd_ctl_open(&handle, card)) < 0) {
Con_Printf("Error: control open (%i): %s\n", card, snd_strerror(rc));
return rc;
}
if ((rc = snd_ctl_hw_info(handle, &info)) < 0) {
Con_Printf("Error: control hardware info (%i): %s\n", card,
snd_strerror(rc));
snd_ctl_close(handle);
return rc;
}
snd_ctl_close(handle);
if (dev==-1) {
for (dev = 0; dev < info.pcmdevs; dev++) {
if ((rc=snd_pcm_open(&pcm_handle,card,dev,
SND_PCM_OPEN_PLAYBACK
| SND_PCM_OPEN_NONBLOCK))==0) {
return 0;
}
}
} else {
if (dev>=0 && dev <info.pcmdevs) {
if ((rc=snd_pcm_open(&pcm_handle,card,dev,
SND_PCM_OPEN_PLAYBACK
| SND_PCM_OPEN_NONBLOCK))==0) {
return 0;
}
}
}
return 1;
}
qboolean SNDDMA_Init(void)
{
int rc=0,i;
char *err_msg="";
int rate,format,bps,stereo,frag_size;
unsigned int mask;
mask = snd_cards_mask();
if (!mask) {
Con_Printf("No sound cards detected\n");
return 0;
}
if ((i=COM_CheckParm("-sndcard"))!=0) {
card=atoi(com_argv[i+1]);
}
if ((i=COM_CheckParm("-snddev"))!=0) {
dev=atoi(com_argv[i+1]);
}
if (card==-1) {
for (card=0; card<SND_CARDS; card++) {
if (!(mask & (1<<card)))
continue;
rc=check_card(card);
if (rc<0)
return 0;
if (!rc)
goto dev_openned;
}
} else {
if (dev==-1) {
rc=check_card(card);
if (rc<0)
return 0;
if (!rc)
goto dev_openned;
} else {
if ((rc=snd_pcm_open(&pcm_handle,card,dev,
SND_PCM_OPEN_PLAYBACK
| SND_PCM_OPEN_NONBLOCK))<0) {
Con_Printf("Error: audio open error: %s\n", snd_strerror(rc));
return 0;
}
goto dev_openned;
}
}
Con_Printf("Error: audio open error: %s\n", snd_strerror(rc));
return 0;
dev_openned:
Con_Printf("Using card %d, device %d.\n", card, dev);
memset(&cinfo, 0, sizeof(cinfo));
cinfo.channel = SND_PCM_CHANNEL_PLAYBACK;
snd_pcm_channel_info(pcm_handle, &cinfo);
Con_Printf("%08x %08x %08x\n",cinfo.flags,cinfo.formats,cinfo.rates);
if (cinfo.rates & SND_PCM_RATE_44100) {
rate=44100;
frag_size=512; /* assuming stereo 8 bit */
} else if (cinfo.rates & SND_PCM_RATE_22050) {
rate=22050;
frag_size=256; /* assuming stereo 8 bit */
} else if (cinfo.rates & SND_PCM_RATE_11025) {
rate=11025;
frag_size=128; /* assuming stereo 8 bit */
} else {
Con_Printf("ALSA: desired rates not supported\n");
goto error_2;
}
if (cinfo.formats & SND_PCM_FMT_S16_LE) {
format=SND_PCM_SFMT_S16_LE;
bps=16;
frag_size*=2;
} else if (cinfo.formats & SND_PCM_FMT_U8) {
format=SND_PCM_SFMT_U8;
bps=8;
} else {
Con_Printf("ALSA: desired formats not supported\n");
goto error_2;
}
if (cinfo.max_voices>=2) {
stereo=1;
} else {
stereo=0;
frag_size/=2;
}
err_msg="audio flush";
if ((rc=snd_pcm_channel_flush(pcm_handle, SND_PCM_CHANNEL_PLAYBACK))<0)
goto error;
err_msg="audio munmap";
if ((rc=snd_pcm_munmap(pcm_handle, SND_PCM_CHANNEL_PLAYBACK))<0)
goto error;
memset(&params, 0, sizeof(params));
params.channel = SND_PCM_CHANNEL_PLAYBACK;
params.mode = SND_PCM_MODE_BLOCK;
params.format.interleave=1;
params.format.format=format;
params.format.rate=rate;
params.format.voices=stereo+1;
params.start_mode = SND_PCM_START_GO;
params.stop_mode = SND_PCM_STOP_ROLLOVER;
params.buf.block.frag_size=frag_size;
params.buf.block.frags_min=1;
params.buf.block.frags_max=-1;
// err_msg="audio flush";
// if ((rc=snd_pcm_channel_flush(pcm_handle, SND_PCM_CHANNEL_PLAYBACK))<0)
// goto error;
err_msg="audio params";
if ((rc=snd_pcm_channel_params(pcm_handle, &params))<0)
goto error;
err_msg="audio mmap";
if ((rc=snd_pcm_mmap(pcm_handle, SND_PCM_CHANNEL_PLAYBACK, &mmap_control, (void **)&mmap_data))<0)
goto error;
err_msg="audio prepare";
if ((rc=snd_pcm_plugin_prepare(pcm_handle, SND_PCM_CHANNEL_PLAYBACK))<0)
goto error;
memset(&setup, 0, sizeof(setup));
setup.mode = SND_PCM_MODE_BLOCK;
setup.channel = SND_PCM_CHANNEL_PLAYBACK;
err_msg="audio setup";
if ((rc=snd_pcm_channel_setup(pcm_handle, &setup))<0)
goto error;
shm=&sn;
memset((dma_t*)shm,0,sizeof(*shm));
shm->splitbuffer = 0;
shm->channels=setup.format.voices;
shm->submission_chunk=128; // don't mix less than this #
shm->samplepos=0; // in mono samples
shm->samplebits=setup.format.format==SND_PCM_SFMT_S16_LE?16:8;
shm->samples=setup.buf.block.frags*setup.buf.block.frag_size/(shm->samplebits/8); // mono samples in buffer
shm->speed=setup.format.rate;
shm->buffer=(unsigned char*)mmap_data;
Con_Printf("%5d stereo\n", shm->channels - 1);
Con_Printf("%5d samples\n", shm->samples);
Con_Printf("%5d samplepos\n", shm->samplepos);
Con_Printf("%5d samplebits\n", shm->samplebits);
Con_Printf("%5d submission_chunk\n", shm->submission_chunk);
Con_Printf("%5d speed\n", shm->speed);
Con_Printf("0x%x dma buffer\n", shm->buffer);
Con_Printf("%5d total_channels\n", total_channels);
snd_inited=1;
return 1;
error:
Con_Printf("Error: %s: %s\n", err_msg, snd_strerror(rc));
error_2:
snd_pcm_close(pcm_handle);
return 0;
}
int SNDDMA_GetDMAPos(void)
{
if (!snd_inited) return 0;
shm->samplepos=(mmap_control->status.frag_io+1)*setup.buf.block.frag_size/(shm->samplebits/8);
return shm->samplepos;
}
void SNDDMA_Shutdown(void)
{
if (snd_inited)
{
snd_pcm_close(pcm_handle);
snd_inited = 0;
}
}
/*
==============
SNDDMA_Submit
Send sound to device if buffer isn't really the dma buffer
===============
*/
void SNDDMA_Submit(void)
{
int count=paintedtime-soundtime;
int i,s,e;
int rc;
count+=setup.buf.block.frag_size-1;
count/=setup.buf.block.frag_size;
s=soundtime/setup.buf.block.frag_size;
e=s+count;
for (i=s; i<e; i++)
mmap_control->fragments[i % setup.buf.block.frags].data=1;
switch (mmap_control->status.status) {
case SND_PCM_STATUS_PREPARED:
if ((rc=snd_pcm_channel_go(pcm_handle, SND_PCM_CHANNEL_PLAYBACK))<0) {
fprintf(stderr, "unable to start playback. %s\n",
snd_strerror(rc));
exit(1);
}
break;
case SND_PCM_STATUS_RUNNING:
break;
case SND_PCM_STATUS_UNDERRUN:
if ((rc=snd_pcm_plugin_prepare(pcm_handle, SND_PCM_CHANNEL_PLAYBACK))<0) {
fprintf(stderr, "underrun: playback channel prepare error. %s\n",
snd_strerror(rc));
exit(1);
}
break;
default:
break;
}
}
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