ref: 74e47cdeb4f9b8d81766c24391bac05f87922115
dir: /kern/devaudio-unix.c/
/* * Linux and BSD */ #include <sys/ioctl.h> #ifdef __linux__ #include <linux/soundcard.h> #else #include <sys/soundcard.h> #endif #include "u.h" #include "lib.h" #include "dat.h" #include "fns.h" #include "error.h" #include "devaudio.h" enum { Channels = 2, Rate = 44100, Bits = 16, Bigendian = 1, }; static int afd = -1; static int cfd= -1; static int speed; /* maybe this should return -1 instead of sysfatal */ void audiodevopen(void) { int t; ulong ul; afd = -1; cfd = -1; if((afd = open("/dev/dsp", OWRITE)) < 0) goto err; if((cfd = open("/dev/mixer", ORDWR)) < 0) goto err; t = Bits; if(ioctl(afd, SNDCTL_DSP_SAMPLESIZE, &t) < 0) goto err; t = Channels-1; if(ioctl(afd, SNDCTL_DSP_STEREO, &t) < 0) goto err; speed = Rate; ul = Rate; if(ioctl(afd, SNDCTL_DSP_SPEED, &ul) < 0) goto err; return; err: if(afd >= 0) close(afd); afd = -1; oserror(); } void audiodevclose(void) { close(afd); close(cfd); afd = -1; cfd = -1; } static struct { int id9; int id; } names[] = { Vaudio, SOUND_MIXER_VOLUME, Vbass, SOUND_MIXER_BASS, Vtreb, SOUND_MIXER_TREBLE, Vline, SOUND_MIXER_LINE, Vpcm, SOUND_MIXER_PCM, Vsynth, SOUND_MIXER_SYNTH, Vcd, SOUND_MIXER_CD, Vmic, SOUND_MIXER_MIC, // "record", SOUND_MIXER_RECLEV, // "mix", SOUND_MIXER_IMIX, // "pcm2", SOUND_MIXER_ALTPCM, Vspeaker, SOUND_MIXER_SPEAKER // "line1", SOUND_MIXER_LINE1, // "line2", SOUND_MIXER_LINE2, // "line3", SOUND_MIXER_LINE3, // "digital1", SOUND_MIXER_DIGITAL1, // "digital2", SOUND_MIXER_DIGITAL2, // "digital3", SOUND_MIXER_DIGITAL3, // "phonein", SOUND_MIXER_PHONEIN, // "phoneout", SOUND_MIXER_PHONEOUT, // "radio", SOUND_MIXER_RADIO, // "video", SOUND_MIXER_VIDEO, // "monitor", SOUND_MIXER_MONITOR, // "igain", SOUND_MIXER_IGAIN, // "ogain", SOUND_MIXER_OGAIN, }; static int lookname(int id9) { int i; for(i=0; i<nelem(names); i++) if(names[i].id9 == id9) return names[i].id; return -1; } void audiodevsetvol(int what, int left, int right) { int id; ulong x; int can, v; if(cfd < 0) error("audio device not open"); if(what == Vspeed){ x = left; if(ioctl(afd, SNDCTL_DSP_SPEED, &x) < 0) oserror(); speed = x; return; } if((id = lookname(what)) < 0) return; if(ioctl(cfd, SOUND_MIXER_READ_DEVMASK, &can) < 0) can = ~0; if(!(can & (1<<id))) return; v = left | (right<<8); if(ioctl(cfd, MIXER_WRITE(id), &v) < 0) oserror(); } void audiodevgetvol(int what, int *left, int *right) { int id; int can, v; if(cfd < 0) error("audio device not open"); if(what == Vspeed){ *left = *right = speed; return; } if((id = lookname(what)) < 0) return; if(ioctl(cfd, SOUND_MIXER_READ_DEVMASK, &can) < 0) can = ~0; if(!(can & (1<<id))) return; if(ioctl(cfd, MIXER_READ(id), &v) < 0) oserror(); *left = v&0xFF; *right = (v>>8)&0xFF; } int audiodevwrite(void *v, int n) { int m, tot; for(tot=0; tot<n; tot+=m) if((m = write(afd, (uchar*)v+tot, n-tot)) <= 0) oserror(); return tot; } int audiodevread(void *v, int n) { error("no reading"); return -1; }