Magazyn Amiga 15/MA_Cover_15.iso/source/winquake/snd_sun.c

C/C++ Source or Header | 2000-01-25 | 4.3 KB | 219 lines

/*
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>
#include <stdio.h>
#include <sys/audioio.h>
#include <errno.h>
#include "quakedef.h"

int audio_fd;
int snd_inited;

static int bufpos;
static int wbufp;
static audio_info_t info;

#define BUFFER_SIZE        8192

unsigned char dma_buffer[BUFFER_SIZE];
unsigned char pend_buffer[BUFFER_SIZE];
int pending;

static int lastwrite = 0;

qboolean SNDDMA_Init(void)
{
    int rc;
    int fmt;
    int tmp;
    int i;
    char *s;
    int caps;

    if (snd_inited) {
        printf("Sound already init'd\n");
        return;
    }

    shm = &sn;
    shm->splitbuffer = 0;

    audio_fd = open("/dev/audio", O_WRONLY|O_NDELAY);

    if (audio_fd < 0) {
        if (errno == EBUSY) {
            Con_Printf("Audio device is being used by another process\n");
        }
        perror("/dev/audio");
        Con_Printf("Could not open /dev/audio\n");
        return (0);
    }

    if (ioctl(audio_fd, AUDIO_GETINFO, &info) < 0) {
        perror("/dev/audio");
        Con_Printf("Could not communicate with audio device.\n");
        close(audio_fd);
        return 0;
    }

    //
    // set to nonblock
    //
    if (fcntl(audio_fd, F_SETFL, O_NONBLOCK) < 0) {
        perror("/dev/audio");
        close(audio_fd);
        return 0;
    }

    AUDIO_INITINFO(&info);

    shm->speed = 11025;

    // try 16 bit stereo
    info.play.encoding = AUDIO_ENCODING_LINEAR;
    info.play.sample_rate = 11025;
    info.play.channels = 2;
    info.play.precision = 16;

    if (ioctl(audio_fd, AUDIO_SETINFO, &info) < 0) {
        info.play.encoding = AUDIO_ENCODING_LINEAR;
        info.play.sample_rate = 11025;
        info.play.channels = 1;
        info.play.precision = 16;
        if (ioctl(audio_fd, AUDIO_SETINFO, &info) < 0) {
            Con_Printf("Incapable sound hardware.\n");
            close(audio_fd);
            return 0;
        }
        Con_Printf("16 bit mono sound initialized\n");
        shm->samplebits = 16;
        shm->channels = 1;
    } else { // 16 bit stereo
        Con_Printf("16 bit stereo sound initialized\n");
        shm->samplebits = 16;
        shm->channels = 2;
    }

    shm->soundalive = true;
    shm->samples = sizeof(dma_buffer) / (shm->samplebits/8);
    shm->samplepos = 0;
    shm->submission_chunk = 1;
    shm->buffer = (unsigned char *)dma_buffer;

    snd_inited = 1;

    return 1;
}

int SNDDMA_GetDMAPos(void)
{
    if (!snd_inited)
        return (0);

    if (ioctl(audio_fd, AUDIO_GETINFO, &info) < 0) {
        perror("/dev/audio");
        Con_Printf("Could not communicate with audio device.\n");
        close(audio_fd);
        snd_inited = 0;
        return (0);
    }

    return ((info.play.samples*shm->channels) % shm->samples);
}

int SNDDMA_GetSamples(void)
{
    if (!snd_inited)
        return (0);

    if (ioctl(audio_fd, AUDIO_GETINFO, &info) < 0) {
        perror("/dev/audio");
        Con_Printf("Could not communicate with audio device.\n");
        close(audio_fd);
        snd_inited = 0;
        return (0);
    }

    return info.play.samples;
}

void SNDDMA_Shutdown(void)
{
    if (snd_inited) {
        close(audio_fd);
        snd_inited = 0;
    }
}

/*
==============
SNDDMA_Submit

Send sound to device if buffer isn't really the dma buffer
===============
*/
void SNDDMA_Submit(void)
{
    int samps;
    int bsize;
    int bytes, b;
    static unsigned char writebuf[1024];
    unsigned char *p;
    int idx;
    int stop = paintedtime;
    extern int soundtime;

    if (paintedtime < wbufp)
        wbufp = 0; // reset

    bsize = shm->channels * (shm->samplebits/8);
    bytes = (paintedtime - wbufp) * bsize;

    if (!bytes)
        return;

    if (bytes > sizeof(writebuf)) {
        bytes = sizeof(writebuf);
        stop = wbufp + bytes/bsize;
    }

    p = writebuf;
    idx = (wbufp*bsize) & (BUFFER_SIZE - 1);

    for (b = bytes; b; b--) {
        *p++ = dma_buffer[idx];
        idx = (idx + 1) & (BUFFER_SIZE - 1);
    }

    wbufp = stop;

    if (write(audio_fd, writebuf, bytes) < bytes)
        printf("audio can't keep up!\n");

}