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nuq/source/snd_alsa_0_5.c
Bill Currie e0679ee1bf accept sound format paramtetsr and snd_alsa_0_6.c currently doesn't support 
stereo for non-interleaved devices until I figure out how to get it to work.
Kind of hard when I don't have such a device :(
2000-09-19 04:53:53 +00:00

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/*
snd_alsa.c
(description)
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:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
$Id$
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <qtypes.h>
#include <sound.h>
#include <qargs.h>
#include <console.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#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=-1,format=-1,bps,stereo=-1,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 ((i=COM_CheckParm("-sndbits")) != 0) {
i = atoi(com_argv[i+1]);
if (i==16) {
format = SND_PCM_SFMT_S16_LE;
} else if (i==8) {
format = SND_PCM_SFMT_U8;
} else {
Con_Printf("Error: invalid sample bits: %d\n", i);
return 0;
}
}
if ((i=COM_CheckParm("-sndspeed")) != 0) {
rate = atoi(com_argv[i+1]);
if (rate!=44100 && rate!=22050 && rate!=11025) {
Con_Printf("Error: invalid sample rate: %d\n", rate);
return 0;
}
}
if ((i=COM_CheckParm("-sndmono")) != 0) {
stereo=0;
}
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 ((rate==-1 || rate==44100) && cinfo.rates & SND_PCM_RATE_44100) {
rate=44100;
frag_size=512; /* assuming stereo 8 bit */
} else if ((rate==-1 || rate==22050) && cinfo.rates & SND_PCM_RATE_22050) {
rate=22050;
frag_size=256; /* assuming stereo 8 bit */
} else if ((rate==-1 || rate==11025) && 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 ((format==-1 || format==SND_PCM_SFMT_S16_LE) && cinfo.formats & SND_PCM_FMT_S16_LE) {
format=SND_PCM_SFMT_S16_LE;
bps=16;
frag_size*=2;
} else if ((format==-1 || format==SND_PCM_SFMT_U8) && 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 (stereo && 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", (int)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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