| /*
|
| 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"); |
| |
| } |
| |