ref: cd8c8d416b4245458460cfe8e3c00bcb69c3c45b
dir: /u/snd_sun.c/
/* 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"); }