ref: cdb9a6e131c162f8c6f29b4fb131bb78b9ea7928
dir: /kern/devaudio.c/
#include "u.h" #include "lib.h" #include "dat.h" #include "fns.h" #include "error.h" #include "devaudio.h" enum { Qdir = 0, Qaudio, Qvolume, Aclosed = 0, Aread, Awrite, Speed = 44100, Ncmd = 50, /* max volume command words */ }; Dirtab audiodir[] = { ".", {Qdir, 0, QTDIR}, 0, DMDIR|0555, "audio", {Qaudio}, 0, 0666, "volume", {Qvolume}, 0, 0666, }; static struct { QLock lk; Rendez vous; int amode; /* Aclosed/Aread/Awrite for /audio */ } audio; #define aqlock(a) qlock(&(a)->lk) #define aqunlock(a) qunlock(&(a)->lk) static struct { char* name; int flag; int ilval; /* initial values */ int irval; } volumes[] = { "audio", Fout, 50, 50, "synth", Fin|Fout, 0, 0, "cd", Fin|Fout, 0, 0, "line", Fin|Fout, 0, 0, "mic", Fin|Fout|Fmono, 0, 0, "speaker", Fout|Fmono, 0, 0, "treb", Fout, 50, 50, "bass", Fout, 50, 50, "speed", Fin|Fout|Fmono, Speed, Speed, 0 }; static char Emode[] = "illegal open mode"; static char Evolume[] = "illegal volume specifier"; static void resetlevel(void) { int i; for(i=0; volumes[i].name; i++) audiodevsetvol(i, volumes[i].ilval, volumes[i].irval); } static void audioinit(void) { } static Chan* audioattach(char *param) { return devattach('A', param); } static Walkqid* audiowalk(Chan *c, Chan *nc, char **name, int nname) { return devwalk(c, nc, name, nname, audiodir, nelem(audiodir), devgen); } static int audiostat(Chan *c, uchar *db, int n) { return devstat(c, db, n, audiodir, nelem(audiodir), devgen); } static Chan* audioopen(Chan *c, int omode) { int amode; switch((ulong)c->qid.path) { default: error(Eperm); break; case Qvolume: case Qdir: break; case Qaudio: amode = Awrite; if((omode&7) == OREAD) amode = Aread; aqlock(&audio); if(waserror()){ aqunlock(&audio); nexterror(); } if(audio.amode != Aclosed) error(Einuse); audiodevopen(); audio.amode = amode; poperror(); aqunlock(&audio); break; } c = devopen(c, omode, audiodir, nelem(audiodir), devgen); c->mode = openmode(omode); c->flag |= COPEN; c->offset = 0; return c; } static void audioclose(Chan *c) { switch((ulong)c->qid.path) { default: error(Eperm); break; case Qdir: case Qvolume: break; case Qaudio: if(c->flag & COPEN) { aqlock(&audio); audiodevclose(); audio.amode = Aclosed; aqunlock(&audio); } break; } } static long audioread(Chan *c, void *v, long n, vlong off) { int liv, riv, lov, rov; long m; char buf[300]; int j; ulong offset = off; char *a; a = v; switch((ulong)c->qid.path) { default: error(Eperm); break; case Qdir: return devdirread(c, a, n, audiodir, nelem(audiodir), devgen); case Qaudio: if(audio.amode != Aread) error(Emode); aqlock(&audio); if(waserror()){ aqunlock(&audio); nexterror(); } n = audiodevread(v, n); poperror(); aqunlock(&audio); break; case Qvolume: j = 0; buf[0] = 0; for(m=0; volumes[m].name; m++){ audiodevgetvol(m, &lov, &rov); liv = lov; riv = rov; j += snprint(buf+j, sizeof(buf)-j, "%s", volumes[m].name); if((volumes[m].flag & Fmono) || (liv==riv && lov==rov)){ if((volumes[m].flag&(Fin|Fout))==(Fin|Fout) && liv==lov) j += snprint(buf+j, sizeof(buf)-j, " %d", liv); else{ if(volumes[m].flag & Fin) j += snprint(buf+j, sizeof(buf)-j, " in %d", liv); if(volumes[m].flag & Fout) j += snprint(buf+j, sizeof(buf)-j, " out %d", lov); } }else{ if((volumes[m].flag&(Fin|Fout))==(Fin|Fout) && liv==lov && riv==rov) j += snprint(buf+j, sizeof(buf)-j, " left %d right %d", liv, riv); else{ if(volumes[m].flag & Fin) j += snprint(buf+j, sizeof(buf)-j, " in left %d right %d", liv, riv); if(volumes[m].flag & Fout) j += snprint(buf+j, sizeof(buf)-j, " out left %d right %d", lov, rov); } } j += snprint(buf+j, sizeof(buf)-j, "\n"); } return readstr(offset, a, n, buf); } return n; } static long audiowrite(Chan *c, void *vp, long n, vlong off) { long m; int i, v, left, right, in, out; Cmdbuf *cb; USED(off); switch((ulong)c->qid.path) { default: error(Eperm); break; case Qvolume: v = Vaudio; left = 1; right = 1; in = 1; out = 1; cb = parsecmd(vp, n); if(waserror()){ free(cb); nexterror(); } for(i = 0; i < cb->nf; i++){ /* * a number is volume */ if(cb->f[i][0] >= '0' && cb->f[i][0] <= '9') { m = strtoul(cb->f[i], 0, 10); USED(in); if(!out) goto cont0; if(left && right) audiodevsetvol(v, m, m); else if(left) audiodevsetvol(v, m, -1); else if(right) audiodevsetvol(v, -1, m); goto cont0; } for(m=0; volumes[m].name; m++) { if(strcmp(cb->f[i], volumes[m].name) == 0) { v = m; in = 1; out = 1; left = 1; right = 1; goto cont0; } } if(strcmp(cb->f[i], "reset") == 0) { resetlevel(); goto cont0; } if(strcmp(cb->f[i], "in") == 0) { in = 1; out = 0; goto cont0; } if(strcmp(cb->f[i], "out") == 0) { in = 0; out = 1; goto cont0; } if(strcmp(cb->f[i], "left") == 0) { left = 1; right = 0; goto cont0; } if(strcmp(cb->f[i], "right") == 0) { left = 0; right = 1; goto cont0; } error(Evolume); break; cont0:; } free(cb); poperror(); break; case Qaudio: if(audio.amode != Awrite) error(Emode); aqlock(&audio); if(waserror()){ aqunlock(&audio); nexterror(); } n = audiodevwrite(vp, n); poperror(); aqunlock(&audio); break; } return n; } void audioswab(uchar *a, uint n) { ulong *p, *ep, b; p = (ulong*)a; ep = p + (n>>2); while(p < ep) { b = *p; b = (b>>24) | (b<<24) | ((b&0xff0000) >> 8) | ((b&0x00ff00) << 8); *p++ = b; } } Dev audiodevtab = { 'A', "audio", devreset, audioinit, devshutdown, audioattach, audiowalk, audiostat, audioopen, devcreate, audioclose, audioread, devbread, audiowrite, devbwrite, devremove, devwstat, };