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- #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 <linux/soundcard.h>
- #include <stdio.h>
- #include "quakedef.h"
-
- int audio_fd;
- int snd_inited;
-
- static int tryrates[] = { 11025, 22051, 44100, 8000 };
-
- qboolean SNDDMA_Init(void)
- {
-
- int rc;
- int fmt;
- int tmp;
- int i;
- char *s;
- struct audio_buf_info info;
- int caps;
-
- snd_inited = 0;
-
- // open /dev/dsp, confirm capability to mmap, and get size of dma buffer
-
- audio_fd = open("/dev/dsp", O_RDWR);
- if (audio_fd < 0)
- {
- perror("/dev/dsp");
- Con_Printf("Could not open /dev/dsp\n");
- return 0;
- }
-
- rc = ioctl(audio_fd, SNDCTL_DSP_RESET, 0);
- if (rc < 0)
- {
- perror("/dev/dsp");
- Con_Printf("Could not reset /dev/dsp\n");
- close(audio_fd);
- return 0;
- }
-
- if (ioctl(audio_fd, SNDCTL_DSP_GETCAPS, &caps)==-1)
- {
- perror("/dev/dsp");
- Con_Printf("Sound driver too old\n");
- close(audio_fd);
- return 0;
- }
-
- if (!(caps & DSP_CAP_TRIGGER) || !(caps & DSP_CAP_MMAP))
- {
- Con_Printf("Sorry but your soundcard can't do this\n");
- close(audio_fd);
- return 0;
- }
-
- if (ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info)==-1)
- {
- perror("GETOSPACE");
- Con_Printf("Um, can't do GETOSPACE?\n");
- close(audio_fd);
- return 0;
- }
-
- shm = &sn;
- shm->splitbuffer = 0;
-
- // set sample bits & speed
-
- s = getenv("QUAKE_SOUND_SAMPLEBITS");
- if (s) shm->samplebits = atoi(s);
- else if ((i = COM_CheckParm("-sndbits")) != 0)
- shm->samplebits = atoi(com_argv[i+1]);
- if (shm->samplebits != 16 && shm->samplebits != 8)
- {
- ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &fmt);
- if (fmt & AFMT_S16_LE) shm->samplebits = 16;
- else if (fmt & AFMT_U8) shm->samplebits = 8;
- }
-
- s = getenv("QUAKE_SOUND_SPEED");
- if (s) shm->speed = atoi(s);
- else if ((i = COM_CheckParm("-sndspeed")) != 0)
- shm->speed = atoi(com_argv[i+1]);
- else
- {
- for (i=0 ; i<sizeof(tryrates)/4 ; i++)
- if (!ioctl(audio_fd, SNDCTL_DSP_SPEED, &tryrates[i])) break;
- shm->speed = tryrates[i];
- }
-
- s = getenv("QUAKE_SOUND_CHANNELS");
- if (s) shm->channels = atoi(s);
- else if ((i = COM_CheckParm("-sndmono")) != 0)
- shm->channels = 1;
- else if ((i = COM_CheckParm("-sndstereo")) != 0)
- shm->channels = 2;
- else shm->channels = 2;
-
- shm->samples = info.fragstotal * info.fragsize / (shm->samplebits/8);
- shm->submission_chunk = 1;
-
- // memory map the dma buffer
-
- shm->buffer = (unsigned char *) mmap(NULL, info.fragstotal
- * info.fragsize, PROT_WRITE, MAP_FILE|MAP_SHARED, audio_fd, 0);
- if (!shm->buffer)
- {
- perror("/dev/dsp");
- Con_Printf("Could not mmap /dev/dsp\n");
- close(audio_fd);
- return 0;
- }
-
- tmp = 0;
- if (shm->channels == 2)
- tmp = 1;
- rc = ioctl(audio_fd, SNDCTL_DSP_STEREO, &tmp);
- if (rc < 0)
- {
- perror("/dev/dsp");
- Con_Printf("Could not set /dev/dsp to stereo=%d", shm->channels);
- close(audio_fd);
- return 0;
- }
- if (tmp)
- shm->channels = 2;
- else
- shm->channels = 1;
-
- rc = ioctl(audio_fd, SNDCTL_DSP_SPEED, &shm->speed);
- if (rc < 0)
- {
- perror("/dev/dsp");
- Con_Printf("Could not set /dev/dsp speed to %d", shm->speed);
- close(audio_fd);
- return 0;
- }
-
- if (shm->samplebits == 16)
- {
- rc = AFMT_S16_LE;
- rc = ioctl(audio_fd, SNDCTL_DSP_SETFMT, &rc);
- if (rc < 0)
- {
- perror("/dev/dsp");
- Con_Printf("Could not support 16-bit data. Try 8-bit.\n");
- close(audio_fd);
- return 0;
- }
- }
- else if (shm->samplebits == 8)
- {
- rc = AFMT_U8;
- rc = ioctl(audio_fd, SNDCTL_DSP_SETFMT, &rc);
- if (rc < 0)
- {
- perror("/dev/dsp");
- Con_Printf("Could not support 8-bit data.\n");
- close(audio_fd);
- return 0;
- }
- }
- else
- {
- perror("/dev/dsp");
- Con_Printf("%d-bit sound not supported.", shm->samplebits);
- close(audio_fd);
- return 0;
- }
-
- // toggle the trigger & start her up
-
- tmp = 0;
- rc = ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &tmp);
- if (rc < 0)
- {
- perror("/dev/dsp");
- Con_Printf("Could not toggle.\n");
- close(audio_fd);
- return 0;
- }
- tmp = PCM_ENABLE_OUTPUT;
- rc = ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &tmp);
- if (rc < 0)
- {
- perror("/dev/dsp");
- Con_Printf("Could not toggle.\n");
- close(audio_fd);
- return 0;
- }
-
- shm->samplepos = 0;
-
- snd_inited = 1;
- return 1;
-
- }
-
- int SNDDMA_GetDMAPos(void)
- {
-
- struct count_info count;
-
- if (!snd_inited) return 0;
-
- if (ioctl(audio_fd, SNDCTL_DSP_GETOPTR, &count)==-1)
- {
- perror("/dev/dsp");
- Con_Printf("Uh, sound dead.\n");
- close(audio_fd);
- snd_inited = 0;
- return 0;
- }
- // shm->samplepos = (count.bytes / (shm->samplebits / 8)) & (shm->samples-1);
- // fprintf(stderr, "%d \r", count.ptr);
- shm->samplepos = count.ptr / (shm->samplebits / 8);
-
- return shm->samplepos;
-
- }
-
- 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)
- {
- }
-
-