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snd_oss_legacy.c
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snd_oss_legacy.c
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/*
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 the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/shm.h>
#include <sys/wait.h>
#ifdef __linux__
#include <linux/soundcard.h>
#else
#include <sys/soundcard.h>
#endif
#include <stdio.h>
#include "quakedef.h"
#include "qsound.h"
// Global Variables
static int audio_fd;
// Prototypes (that are not in qshound.h)
int SNDDMA_GetDMAPos_OSS_Legacy(void);
void SNDDMA_Shutdown_OSS_Legacy(void);
// Main functions
qbool SNDDMA_Init_OSS_Legacy(qsoundhandler_t *sd)
{
int rc, fmt, tmp, caps;
char *snd_dev = NULL;
struct audio_buf_info info;
snd_dev = Cvar_String("s_oss_device");
if ((audio_fd = open(snd_dev, O_RDWR | O_NONBLOCK)) < 0) {
perror(snd_dev);
Com_Printf("Could not open %s\n", snd_dev);
return 0;
}
if ((rc = ioctl(audio_fd, SNDCTL_DSP_RESET, 0)) < 0) {
perror(snd_dev);
Com_Printf("Could not reset %s\n", snd_dev);
close(audio_fd);
return 0;
}
if (ioctl(audio_fd, SNDCTL_DSP_GETCAPS, &caps) == -1) {
perror(snd_dev);
Com_Printf("Sound driver too old\n");
close(audio_fd);
return 0;
}
if (!(caps & DSP_CAP_TRIGGER) || !(caps & DSP_CAP_MMAP)) {
Com_Printf("Sorry but your soundcard can't do this\n");
close(audio_fd);
return 0;
}
// set sample bits & speed
shm->format.width = (int) (s_bits.value / 8);
shm->format.speed = SND_Rate((int)s_khz.value);
shm->format.channels = ((int) s_stereo.value == 0) ? 1 : 2;
if (shm->format.width != 2 && shm->format.width != 1) {
ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &fmt);
if (fmt & AFMT_S16_LE) // disconnect: FIXME: what if bigendian?
shm->format.width = 2;
else if (fmt & AFMT_U8)
shm->format.width = 1;
}
tmp = (shm->format.channels == 2);
if ((rc = ioctl(audio_fd, SNDCTL_DSP_STEREO, &tmp)) < 0) {
perror(snd_dev);
Com_Printf ("Could not set %s to stereo", snd_dev);
close(audio_fd);
return 0;
}
if ((rc = ioctl(audio_fd, SNDCTL_DSP_SPEED, &shm->format.speed)) < 0) {
perror(snd_dev);
Com_Printf("Could not set %s speed to %d", snd_dev, shm->format.speed);
close(audio_fd);
return 0;
}
if (shm->format.width == 2) {
rc = AFMT_S16_LE;
rc = ioctl(audio_fd, SNDCTL_DSP_SETFMT, &rc);
if (rc < 0) {
perror(snd_dev);
Com_Printf("Could not support 16-bit data. Try 8-bit.\n");
close(audio_fd);
return 0;
}
} else if (shm->format.width == 1) {
rc = AFMT_U8;
rc = ioctl(audio_fd, SNDCTL_DSP_SETFMT, &rc);
if (rc < 0) {
perror(snd_dev);
Com_Printf("Could not support 8-bit data.\n");
close(audio_fd);
return 0;
}
} else {
perror(snd_dev);
Com_Printf("%d-bit sound not supported.", shm->format.width * 8);
close(audio_fd);
return 0;
}
if (ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info) == -1) {
perror("GETOSPACE");
Com_Printf ("Um, can't do GETOSPACE?\n");
close(audio_fd);
return 0;
}
shm->sampleframes = info.fragstotal * info.fragsize / shm->format.width / shm->format.channels;
shm->samples = shm->sampleframes * shm->format.channels;
// memory map the dma buffer
shm->bufferlength = info.fragstotal * info.fragsize;
shm->buffer = (unsigned char *) mmap(NULL, shm->bufferlength, PROT_WRITE, MAP_FILE|MAP_SHARED, audio_fd, 0);
if (!shm->buffer || shm->buffer == (unsigned char *)-1) {
perror(snd_dev);
Com_Printf ("Could not mmap %s\n", snd_dev);
close(audio_fd);
return 0;
}
// toggle the trigger & start her up
tmp = 0;
rc = ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &tmp);
if (rc < 0) {
perror(snd_dev);
Com_Printf("Could not toggle.\n");
close(audio_fd);
return 0;
}
tmp = PCM_ENABLE_OUTPUT;
rc = ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &tmp);
if (rc < 0) {
perror(snd_dev);
Com_Printf("Could not toggle.\n");
close(audio_fd);
return 0;
}
shm->samplepos = 0;
sd->GetDMAPos = SNDDMA_GetDMAPos_OSS_Legacy;
sd->GetAvail = NULL;
sd->Submit = NULL;
sd->Shutdown = SNDDMA_Shutdown_OSS_Legacy;
sd->name = "snd_oss (legacy)";
return 1;
}
int SNDDMA_GetDMAPos_OSS_Legacy(void)
{
struct count_info count;
char *snd_dev = NULL;
if (!shm)
return 0;
snd_dev = Cvar_String("s_oss_device");
if (ioctl(audio_fd, SNDCTL_DSP_GETOPTR, &count) == -1) {
perror(snd_dev);
Com_Printf("Uh, sound dead.\n");
close(audio_fd);
return 0;
}
shm->samplepos = count.ptr / shm->format.width;
return shm->samplepos;
}
void SNDDMA_Shutdown_OSS_Legacy(void)
{
int tmp = 0;
// unmap the memory
if (shm->buffer)
munmap(shm->buffer, shm->bufferlength);
if (audio_fd) {
// stop the sound
ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &tmp);
ioctl(audio_fd, SNDCTL_DSP_RESET, 0);
// close the device
close(audio_fd);
}
audio_fd = -1;
}