/*
 * Copyright (c) 1998-2001 Yoshihide SONODA
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/ioctl.h>

#if defined (__FreeBSD__) && __FreeBSD__ < 4
#include <machine/soundcard.h>
#else
#include <sys/soundcard.h>
#endif

#include "wavefmt.h"

#ifndef DEFAULT_DSP
#define DEFAULT_DSP "/dev/dspW"
#endif

#ifndef DEFAULT_BUFFERSIZE
#define DEFAULT_BUFFERSIZE 2048
#endif

int openDSP(const char* devname, PWAVEFORMATEX pwf);
int closeDSP(int fd);

    char buf[1024];
int main(void)
{
    WAVEFORMATEX waveFormatEx;
    int fd, i, cnt;

    waveFormatEx.wFormatTag = WAVE_FORMAT_PCM;
    waveFormatEx.nChannels = 1;
    waveFormatEx.nSamplesPerSec = 22050;
    waveFormatEx.nAvgBytesPerSec = 44100;
    waveFormatEx.nBlockAlign = 2;
    waveFormatEx.wBitsPerSample = 16;
    waveFormatEx.cbSize = 0; 

    fd = openDSP (DEFAULT_DSP, &waveFormatEx);
    if (fd == -1) {
	perror ("open");
	exit(-1);
    }

    for (i = 0; i < 1024; i++) {
	cnt = read (fd, &buf, 1024);
	if (cnt == -1) {
		perror ("read failed\n");
		exit(-1);
	}
	write (fileno(stdout), buf, 1024);
    }
    closeDSP(fd);
}

int openDSP(const char* devname, PWAVEFORMATEX pwf)
{
    int fd;
    int status;
    int arg;

    if ((fd = open(devname, O_RDONLY, 0)) == -1)
    	return fd;

    arg = (int)(pwf->nChannels);
    status = ioctl(fd, SOUND_PCM_READ_CHANNELS, &arg);
	if (status < 0)
	{
		perror("openDSP");
		close(fd);
		return -1;
	}

    if (arg != (int)(pwf->nChannels))
    {
		fprintf(stderr, "Can't set channels.\n");
		close(fd);
		return -1;
    }

    arg = (int)(pwf->nSamplesPerSec);
    status = ioctl(fd, SOUND_PCM_WRITE_RATE, &arg);
    if (status < 0)
    {
		perror("openDSP");
		fprintf(stderr, "Can't set sampling rate.\n");
		close(fd);
		return -1;
    }
	
	if (arg != (int)pwf->nSamplesPerSec)
	{
		fprintf(stderr, "Warning: Can't set sampling rate %d Hz.\n",
				(int)pwf->nSamplesPerSec);
		fprintf(stderr, "Using %d Hz instead.\n", arg);
	}
#ifdef DEBUG
    printf("DSP - Sampling rate: %d\n", arg);
#endif
#ifdef notdef
    arg = (int)(pwf->wBitsPerSample);
    status = ioctl(fd, SOUND_PCM_READ_BITS, &arg);
    if (status < 0)
	{
		perror("openDSP");
		close(fd);
		return -1;
	}

	if (arg != (int)(pwf->wBitsPerSample))
    {
		fprintf(stderr, "Can't set bit width.\n");
		close(fd);
		return -1;
    }
#endif
    return fd;
}

int closeDSP(int fd)
{
    ioctl(fd, SNDCTL_DSP_SYNC);
    return close(fd);
}