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quakeforge/libs/audio/targets/snd_oss.c

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/*
snd_oss.c
OSS sound output plugin.
Copyright (C) 1996-1997 Id Software, Inc.
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
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
static __attribute__ ((used)) const char rcsid[] =
"$Id$";
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
# include <sys/ioctl.h>
#endif
#ifdef HAVE_SYS_MMAN_H
# include <sys/mman.h>
#endif
#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
#ifdef 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
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/shm.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "QF/cmd.h"
#include "QF/cvar.h"
#include "QF/plugin.h"
#include "QF/qargs.h"
#include "QF/sys.h"
#include "snd_render.h"
#ifndef MAP_FAILED
# define MAP_FAILED ((void *) -1)
#endif
static int audio_fd;
static int snd_inited;
static int mmaped_io = 0;
static const char *snd_dev = "/dev/dsp";
static volatile dma_t sn;
static int tryrates[] = { 44100, 48000, 11025, 22050, 22051, 44100, 8000 };
static cvar_t *snd_stereo;
static cvar_t *snd_rate;
static cvar_t *snd_device;
static cvar_t *snd_bits;
static cvar_t *snd_oss_mmaped;
static plugin_t plugin_info;
static plugin_data_t plugin_info_data;
static plugin_funcs_t plugin_info_funcs;
static general_data_t plugin_info_general_data;
static general_funcs_t plugin_info_general_funcs;
static snd_output_data_t plugin_info_snd_output_data;
static snd_output_funcs_t plugin_info_snd_output_funcs;
static void
SNDDMA_Init_Cvars (void)
{
snd_stereo = Cvar_Get ("snd_stereo", "1", CVAR_ROM, NULL,
"sound stereo output");
snd_rate = Cvar_Get ("snd_rate", "0", CVAR_ROM, NULL,
"sound playback rate. 0 is system default");
snd_device = Cvar_Get ("snd_device", "", CVAR_ROM, NULL,
"sound device. \"\" is system default");
snd_bits = Cvar_Get ("snd_bits", "0", CVAR_ROM, NULL,
"sound sample depth. 0 is system default");
snd_oss_mmaped = Cvar_Get ("snd_oss_mmaped", "1", CVAR_ROM, NULL,
"mmaped io");
}
static volatile dma_t *
try_open (int rw)
{
int caps, fmt, rc, tmp, i;
int retries = 3;
int omode = O_WRONLY;
int mmmode = PROT_WRITE;
int mmflags = MAP_FILE;
struct audio_buf_info info;
snd_inited = 0;
mmaped_io = snd_oss_mmaped->int_val;
// open snd_dev, confirm capability to mmap, and get size of dma buffer
if (snd_device->string[0])
snd_dev = snd_device->string;
if (rw) {
omode = O_RDWR;
mmmode |= PROT_READ;
mmflags |= MAP_SHARED;
}
omode |= O_NONBLOCK;
audio_fd = open (snd_dev, omode);
if (audio_fd < 0) { // Failed open, retry up to 3 times
// if it's busy
while ((audio_fd < 0) && retries-- &&
((errno == EAGAIN) || (errno == EBUSY))) {
sleep (1);
audio_fd = open (snd_dev, omode);
}
if (audio_fd < 0) {
Sys_Printf ("Could not open %s: %s\n", snd_dev, strerror (errno));
return 0;
}
}
if ((rc = ioctl (audio_fd, SNDCTL_DSP_RESET, 0)) < 0) {
Sys_Printf ("Could not reset %s: %s\n", snd_dev, strerror (errno));
close (audio_fd);
return 0;
}
if (ioctl (audio_fd, SNDCTL_DSP_GETCAPS, &caps) == -1) {
Sys_Printf ("Sound driver too old: %s\n", strerror (errno));
close (audio_fd);
return 0;
}
if (!(caps & DSP_CAP_TRIGGER) || !(caps & DSP_CAP_MMAP)) {
Sys_Printf ("Sound device can't do memory-mapped I/O.\n");
close (audio_fd);
return 0;
}
// set sample bits & speed
sn.samplebits = snd_bits->int_val;
if (sn.samplebits != 16 && sn.samplebits != 8) {
ioctl (audio_fd, SNDCTL_DSP_GETFMTS, &fmt);
if (fmt & AFMT_S16_LE) { // little-endian 16-bit signed
sn.samplebits = 16;
} else {
if (fmt & AFMT_U8) { // unsigned 8-bit ulaw
sn.samplebits = 8;
}
}
}
if (sn.samplebits == 16) {
rc = AFMT_S16_LE;
rc = ioctl (audio_fd, SNDCTL_DSP_SETFMT, &rc);
if (rc < 0) {
Sys_Printf ("Could not support 16-bit data. Try 8-bit. %s\n",
strerror (errno));
close (audio_fd);
return 0;
}
} else if (sn.samplebits == 8) {
rc = AFMT_U8;
rc = ioctl (audio_fd, SNDCTL_DSP_SETFMT, &rc);
if (rc < 0) {
Sys_Printf ("Could not support 8-bit data. %s\n",
strerror (errno));
close (audio_fd);
return 0;
}
} else {
Sys_Printf ("%d-bit sound not supported. %s", sn.samplebits,
strerror (errno));
close (audio_fd);
return 0;
}
tmp = sn.channels;
rc = ioctl (audio_fd, SNDCTL_DSP_CHANNELS, &tmp);
if (rc < 0) {
Sys_Printf ("Could not set %s to stereo=%d: %s\n", snd_dev,
sn.channels, strerror (errno));
close (audio_fd);
return 0;
}
if (snd_rate->int_val) {
sn.speed = snd_rate->int_val;
} else {
for (i = 0; i < ((int) sizeof (tryrates) / 4); i++)
if (!ioctl (audio_fd, SNDCTL_DSP_SPEED, &tryrates[i]))
break;
sn.speed = tryrates[i];
}
if (!snd_stereo->int_val) {
sn.channels = 1;
} else {
sn.channels = 2;
}
rc = ioctl (audio_fd, SNDCTL_DSP_SPEED, &sn.speed);
if (rc < 0) {
Sys_Printf ("Could not set %s speed to %d: %s\n", snd_dev, sn.speed,
strerror (errno));
close (audio_fd);
return 0;
}
if (ioctl (audio_fd, SNDCTL_DSP_GETOSPACE, &info) == -1) {
Sys_Printf ("Um, can't do GETOSPACE?: %s\n", strerror (errno));
close (audio_fd);
return 0;
}
sn.frames = info.fragstotal;
sn.submission_chunk = 1;
if (mmaped_io) { // memory map the dma buffer
unsigned long sz = sysconf (_SC_PAGESIZE);
unsigned long len = info.fragstotal * info.fragsize;
len = (len + sz - 1) & ~(sz - 1);
sn.buffer = (byte *) mmap (NULL, len, mmmode, mmflags, audio_fd, 0);
if (sn.buffer == MAP_FAILED) {
Sys_Printf ("Could not mmap %s: %s\n", snd_dev, strerror (errno));
close (audio_fd);
return 0;
}
} else {
sn.buffer = malloc (sn.frames * sn.channels * (sn.samplebits / 8));
if (!sn.buffer) {
Sys_Printf ("SNDDMA_Init: memory allocation failure\n");
close (audio_fd);
return 0;
}
}
// toggle the trigger & start her up
tmp = 0;
rc = ioctl (audio_fd, SNDCTL_DSP_SETTRIGGER, &tmp);
if (rc < 0) {
Sys_Printf ("Could not toggle.: %s\n", strerror (errno));
if (mmaped_io)
munmap (sn.buffer, sn.frames * sn.channels * sn.samplebits / 8);
close (audio_fd);
return 0;
}
tmp = PCM_ENABLE_OUTPUT;
rc = ioctl (audio_fd, SNDCTL_DSP_SETTRIGGER, &tmp);
if (rc < 0) {
Sys_Printf ("Could not toggle.: %s\n", strerror (errno));
if (mmaped_io)
munmap (sn.buffer, sn.frames * sn.channels * sn.samplebits / 8);
close (audio_fd);
return 0;
}
sn.framepos = 0;
snd_inited = 1;
return &sn;
}
static volatile dma_t *
SNDDMA_Init (void)
{
volatile dma_t *shm;
if ((shm = try_open (0)))
return shm;
return try_open (1);
}
static int
SNDDMA_GetDMAPos (void)
{
struct count_info count;
if (!snd_inited)
return 0;
if (ioctl (audio_fd, SNDCTL_DSP_GETOPTR, &count) == -1) {
Sys_Printf ("Uh, %s dead: %s\n", snd_dev, strerror (errno));
if (mmaped_io)
munmap (sn.buffer, sn.frames * sn.channels * sn.samplebits / 8);
close (audio_fd);
snd_inited = 0;
return 0;
}
// sn.samplepos = (count.bytes / (sn.samplebits / 8)) & (sn.samples-1);
// fprintf(stderr, "%d \r", count.ptr);
sn.framepos = count.ptr / (sn.samplebits / 8);
return sn.framepos;
}
static void
SNDDMA_Shutdown (void)
{
if (snd_inited) {
if (mmaped_io)
munmap (sn.buffer, sn.frames * sn.channels * sn.samplebits / 8);
close (audio_fd);
snd_inited = 0;
}
}
static int
sample_bytes (int frames)
{
return frames * sn.channels * sn.samplebits / 8;
}
/*
SNDDMA_Submit
Send sound to device if buffer isn't really the dma buffer
*/
static void
SNDDMA_Submit (void)
{
int frames;
int len;
int offset;
if (snd_inited && !mmaped_io) {
frames = *plugin_info_snd_output_data.paintedtime
- *plugin_info_snd_output_data.soundtime;
offset = frames * sn.channels * sn.samplebits / 8;
if (sn.framepos + frames <= sn.frames) {
len = sample_bytes (frames);
if (write (audio_fd, sn.buffer + offset, len) != len)
Sys_Printf ("SNDDMA_Submit(): %s\n", strerror (errno));
} else {
int len = sample_bytes (sn.frames - sn.framepos);
if (write (audio_fd, sn.buffer + offset, len) != len)
Sys_Printf ("SNDDMA_Submit(): %s\n", strerror (errno));
if (write (audio_fd, sn.buffer, offset - len) != offset - len)
Sys_Printf ("SNDDMA_Submit(): %s\n", strerror (errno));
}
*plugin_info_snd_output_data.soundtime += frames;
}
}
static void
SNDDMA_BlockSound (void)
{
}
static void
SNDDMA_UnblockSound (void)
{
}
PLUGIN_INFO(snd_output, oss)
{
plugin_info.type = qfp_snd_output;
plugin_info.api_version = QFPLUGIN_VERSION;
plugin_info.plugin_version = "0.1";
plugin_info.description = "OSS digital output";
plugin_info.copyright = "Copyright (C) 1996-1997 id Software, Inc.\n"
"Copyright (C) 1999,2000,2001 contributors of the QuakeForge "
"project\n"
"Please see the file \"AUTHORS\" for a list of contributors";
plugin_info.functions = &plugin_info_funcs;
plugin_info.data = &plugin_info_data;
plugin_info_data.general = &plugin_info_general_data;
plugin_info_data.input = NULL;
plugin_info_data.snd_output = &plugin_info_snd_output_data;
plugin_info_funcs.general = &plugin_info_general_funcs;
plugin_info_funcs.input = NULL;
plugin_info_funcs.snd_output = &plugin_info_snd_output_funcs;
plugin_info_general_funcs.p_Init = SNDDMA_Init_Cvars;
plugin_info_general_funcs.p_Shutdown = NULL;
plugin_info_snd_output_funcs.pS_O_Init = SNDDMA_Init;
plugin_info_snd_output_funcs.pS_O_Shutdown = SNDDMA_Shutdown;
plugin_info_snd_output_funcs.pS_O_GetDMAPos = SNDDMA_GetDMAPos;
plugin_info_snd_output_funcs.pS_O_Submit = SNDDMA_Submit;
plugin_info_snd_output_funcs.pS_O_BlockSound = SNDDMA_BlockSound;
plugin_info_snd_output_funcs.pS_O_UnblockSound = SNDDMA_UnblockSound;
return &plugin_info;
}
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