ref: c5bd2add37725041c1924132a8a4fd67548fb975
dir: /src/audio/au_oss.c/
/*************************************************************************/
/* */
/* Language Technologies Institute */
/* Carnegie Mellon University */
/* Copyright (c) 2000 */
/* All Rights Reserved. */
/* */
/* Permission is hereby granted, free of charge, to use and distribute */
/* this software and its documentation without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of this work, and to */
/* permit persons to whom this work is furnished to do so, subject to */
/* the following conditions: */
/* 1. The code must retain the above copyright notice, this list of */
/* conditions and the following disclaimer. */
/* 2. Any modifications must be clearly marked as such. */
/* 3. Original authors' names are not deleted. */
/* 4. The authors' names are not used to endorse or promote products */
/* derived from this software without specific prior written */
/* permission. */
/* */
/* CARNEGIE MELLON UNIVERSITY AND THE CONTRIBUTORS TO THIS WORK */
/* DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING */
/* ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT */
/* SHALL CARNEGIE MELLON UNIVERSITY NOR THE CONTRIBUTORS BE LIABLE */
/* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES */
/* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN */
/* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, */
/* ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF */
/* THIS SOFTWARE. */
/* */
/*************************************************************************/
/* Author: Alan W Black (awb@cs.cmu.edu) */
/* Date: August 2000 */
/*************************************************************************/
/* */
/* Access to "voxware" audio devices (Linux/FreeBSD etc), */
/* (sorry my naming convention is showing my age here, basic any */
/* generic audio on Linux/BSD such as OSS and ALSA) */
/* */
/*************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include "cst_string.h"
#include "cst_wave.h"
#include "cst_audio.h"
#ifdef CST_AUDIO_LINUX
/* Linux/voxware audio specific */
#include <sys/ioctl.h>
#include <sys/soundcard.h>
#include <sys/types.h>
#endif
#ifdef CST_AUDIO_FREEBSD
/* probably Net and Open too */
#include <machine/soundcard.h>
#endif
#include <sys/stat.h>
#include <fcntl.h>
static const char * const oss_audio_device = "/dev/dsp";
cst_audiodev *audio_open_oss(int sps, int channels, cst_audiofmt fmt)
{
cst_audiodev *ad;
int afmt;
int sfmts;
int afd;
int frag;
afd = open(oss_audio_device,O_WRONLY);
if (afd == -1)
{
cst_errmsg("oss_audio: failed to open audio device %s\n",
oss_audio_device);
return NULL;
}
ad = cst_alloc(cst_audiodev, 1);
ad->sps = sps;
ad->channels = channels;
ad->fmt = fmt;
ad->platform_data = (void *)afd;
if (ad->channels == 0)
ad->channels = 1;
ioctl(afd,SNDCTL_DSP_RESET,0);
ad->real_sps = ad->sps;
ad->real_channels = ad->channels;
ioctl(afd,SNDCTL_DSP_CHANNELS,&ad->real_channels);
if (ad->real_channels != ad->channels)
{
/* Its a stereo only device so it'll play things twice as fast */
ad->real_sps /= 2;
}
ioctl(afd,SNDCTL_DSP_SPEED,&ad->real_sps);
frag = (4 << 16) | 10;
ioctl(afd,SNDCTL_DSP_SETFRAGMENT,&frag);
ioctl(afd,SNDCTL_DSP_GETFMTS,&sfmts);
if (fmt == CST_AUDIO_LINEAR8 && (sfmts & AFMT_U8))
{
ad->real_fmt = CST_AUDIO_LINEAR8;
afmt = AFMT_U8;
}
else if (fmt == CST_AUDIO_MULAW && (sfmts & AFMT_MU_LAW))
{
ad->real_fmt = CST_AUDIO_MULAW;
afmt = AFMT_MU_LAW;
}
else if (CST_LITTLE_ENDIAN)
{
if (sfmts & AFMT_S16_LE)
{
ad->real_fmt = CST_AUDIO_LINEAR16;
afmt = AFMT_S16_LE;
}
else if (sfmts & AFMT_S16_BE) /* not likely */
{
ad->byteswap = 1;
ad->real_fmt = CST_AUDIO_LINEAR16;
afmt = AFMT_S16_BE;
}
else if (sfmts & AFMT_U8)
{
afmt = AFMT_U8;
ad->real_fmt = CST_AUDIO_LINEAR8;
}
else
{
cst_free(ad);
close(afd);
return NULL;
}
}
else
{
if (sfmts & AFMT_S16_BE)
{
ad->real_fmt = CST_AUDIO_LINEAR16;
afmt = AFMT_S16_BE;
}
else if (sfmts & AFMT_S16_LE) /* likely */
{
ad->real_fmt = CST_AUDIO_LINEAR16;
ad->byteswap = 1;
afmt = AFMT_S16_LE;
}
else if (sfmts & AFMT_U8)
{
ad->real_fmt = CST_AUDIO_LINEAR8;
afmt = AFMT_U8;
}
else
{
cst_free(ad);
close(afd);
return NULL;
}
}
ioctl(afd, SNDCTL_DSP_SETFMT, &afmt);
return ad;
}
int audio_close_oss(cst_audiodev *ad)
{
int rv;
if (ad == NULL)
return 0;
ioctl((int)ad->platform_data, SNDCTL_DSP_SYNC, NULL);
rv = close((int)ad->platform_data);
cst_free(ad);
return rv;
}
int audio_write_oss(cst_audiodev *ad, void *samples, int num_bytes)
{
return write((int)ad->platform_data,samples,num_bytes);
}
int audio_flush_oss(cst_audiodev *ad)
{
return ioctl((int)ad->platform_data, SNDCTL_DSP_SYNC, NULL);
}
int audio_drain_oss(cst_audiodev *ad)
{
return ioctl((int)ad->platform_data, SNDCTL_DSP_RESET, NULL);
}