/*************************************************************************//*                                                                       *//*                  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);}