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/*
* SB 16 driver
*/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "../port/error.h"
#include "io.h"
#include "audio.h"
typedef struct AQueue AQueue;
typedef struct Buf Buf;
enum
{
Qdir = 0,
Qaudio,
Qvolume,
Qstatus,
Fmono = 1,
Fin = 2,
Fout = 4,
Aclosed = 0,
Aread,
Awrite,
Vaudio = 0,
Vsynth,
Vcd,
Vline,
Vmic,
Vspeaker,
Vtreb,
Vbass,
Vspeed,
Nvol,
Speed = 44100,
Ncmd = 50, /* max volume command words */
};
Dirtab
audiodir[] =
{
".", {Qdir, 0, QTDIR}, 0, DMDIR|0555,
"audio", {Qaudio}, 0, 0666,
"volume", {Qvolume}, 0, 0666,
"audiostat",{Qstatus}, 0, 0444,
};
struct Buf
{
uchar* virt;
ulong phys;
Buf* next;
};
struct AQueue
{
Lock;
Buf* first;
Buf* last;
};
static struct
{
QLock;
Rendez vous;
int buffered; /* number of bytes en route */
int bufinit; /* boolean if buffers allocated */
int curcount; /* how much data in current buffer */
int active; /* boolean dma running */
int intr; /* boolean an interrupt has happened */
int amode; /* Aclosed/Aread/Awrite for /audio */
int rivol[Nvol]; /* right/left input/output volumes */
int livol[Nvol];
int rovol[Nvol];
int lovol[Nvol];
int major; /* SB16 major version number (sb 4) */
int minor; /* SB16 minor version number */
ulong totcount; /* how many bytes processed since open */
vlong tottime; /* time at which totcount bytes were processed */
Buf buf[Nbuf]; /* buffers and queues */
AQueue empty;
AQueue full;
Buf* current;
Buf* filling;
} audio;
static struct
{
char* name;
int flag;
int ilval; /* initial values */
int irval;
} volumes[] =
{
[Vaudio] "audio", Fout, 50, 50,
[Vsynth] "synth", Fin|Fout, 0, 0,
[Vcd] "cd", Fin|Fout, 0, 0,
[Vline] "line", Fin|Fout, 0, 0,
[Vmic] "mic", Fin|Fout|Fmono, 0, 0,
[Vspeaker] "speaker", Fout|Fmono, 0, 0,
[Vtreb] "treb", Fout, 50, 50,
[Vbass] "bass", Fout, 50, 50,
[Vspeed] "speed", Fin|Fout|Fmono, Speed, Speed,
0
};
static struct
{
Lock;
int reset; /* io ports to the sound blaster */
int read;
int write;
int wstatus;
int rstatus;
int mixaddr;
int mixdata;
int clri8;
int clri16;
int clri401;
int dma;
void (*startdma)(void);
void (*intr)(void);
} blaster;
static void swab(uchar*);
static char Emajor[] = "soundblaster not responding/wrong version";
static char Emode[] = "illegal open mode";
static char Evolume[] = "illegal volume specifier";
static int
sbcmd(int val)
{
int i, s;
for(i=1<<16; i!=0; i--) {
s = inb(blaster.wstatus);
if((s & 0x80) == 0) {
outb(blaster.write, val);
return 0;
}
}
/* print("#A: sbcmd (%#.2x) timeout\n", val); /**/
return 1;
}
static int
sbread(void)
{
int i, s;
for(i=1<<16; i!=0; i--) {
s = inb(blaster.rstatus);
if((s & 0x80) != 0) {
return inb(blaster.read);
}
}
/* print("#A: sbread did not respond\n"); /**/
return -1;
}
static int
ess1688w(int reg, int val)
{
if(sbcmd(reg) || sbcmd(val))
return 1;
return 0;
}
static int
ess1688r(int reg)
{
if(sbcmd(0xC0) || sbcmd(reg))
return -1;
return sbread();
}
static int
mxcmd(int addr, int val)
{
outb(blaster.mixaddr, addr);
outb(blaster.mixdata, val);
return 1;
}
static int
mxread(int addr)
{
int s;
outb(blaster.mixaddr, addr);
s = inb(blaster.mixdata);
return s;
}
static void
mxcmds(int s, int v)
{
if(v > 100)
v = 100;
if(v < 0)
v = 0;
mxcmd(s, (v*255)/100);
}
static void
mxcmdt(int s, int v)
{
if(v > 100)
v = 100;
if(v <= 0)
mxcmd(s, 0);
else
mxcmd(s, 255-100+v);
}
static void
mxcmdu(int s, int v)
{
if(v > 100)
v = 100;
if(v <= 0)
v = 0;
mxcmd(s, 128-50+v);
}
static void
mxvolume(void)
{
int *left, *right;
int source;
if(audio.amode == Aread){
left = audio.livol;
right = audio.rivol;
}else{
left = audio.lovol;
right = audio.rovol;
}
ilock(&blaster);
mxcmd(0x30, 255); /* left master */
mxcmd(0x31, 255); /* right master */
mxcmd(0x3f, 0); /* left igain */
mxcmd(0x40, 0); /* right igain */
mxcmd(0x41, 0); /* left ogain */
mxcmd(0x42, 0); /* right ogain */
mxcmds(0x32, left[Vaudio]);
mxcmds(0x33, right[Vaudio]);
mxcmds(0x34, left[Vsynth]);
mxcmds(0x35, right[Vsynth]);
mxcmds(0x36, left[Vcd]);
mxcmds(0x37, right[Vcd]);
mxcmds(0x38, left[Vline]);
mxcmds(0x39, right[Vline]);
mxcmds(0x3a, left[Vmic]);
mxcmds(0x3b, left[Vspeaker]);
mxcmdu(0x44, left[Vtreb]);
mxcmdu(0x45, right[Vtreb]);
mxcmdu(0x46, left[Vbass]);
mxcmdu(0x47, right[Vbass]);
source = 0;
if(left[Vsynth])
source |= 1<<6;
if(right[Vsynth])
source |= 1<<5;
if(left[Vaudio])
source |= 1<<4;
if(right[Vaudio])
source |= 1<<3;
if(left[Vcd])
source |= 1<<2;
if(right[Vcd])
source |= 1<<1;
if(left[Vmic])
source |= 1<<0;
if(audio.amode == Aread)
mxcmd(0x3c, 0); /* output switch */
else
mxcmd(0x3c, source);
mxcmd(0x3d, source); /* input left switch */
mxcmd(0x3e, source); /* input right switch */
iunlock(&blaster);
}
static Buf*
getbuf(AQueue *q)
{
Buf *b;
ilock(q);
b = q->first;
if(b)
q->first = b->next;
iunlock(q);
return b;
}
static void
putbuf(AQueue *q, Buf *b)
{
ilock(q);
b->next = 0;
if(q->first)
q->last->next = b;
else
q->first = b;
q->last = b;
iunlock(q);
}
/*
* move the dma to the next buffer
*/
static void
contindma(void)
{
Buf *b;
if(!audio.active)
goto shutdown;
b = audio.current;
if(b){
audio.totcount += Bufsize;
audio.tottime = todget(nil);
}
if(audio.amode == Aread) {
if(b){
putbuf(&audio.full, b);
audio.buffered += Bufsize;
}
b = getbuf(&audio.empty);
} else {
if(b){
putbuf(&audio.empty, b);
audio.buffered -= Bufsize;
}
b = getbuf(&audio.full);
}
audio.current = b;
if(b == 0)
goto shutdown;
if(dmasetup(blaster.dma, b->virt, Bufsize, audio.amode == Aread) >= 0)
return;
print("#A: dmasetup fail\n");
putbuf(&audio.empty, b);
shutdown:
dmaend(blaster.dma);
sbcmd(0xd9); /* exit at end of count */
sbcmd(0xd5); /* pause */
audio.curcount = 0;
audio.active = 0;
}
/*
* cause sb to get an interrupt per buffer.
* start first dma
*/
static void
sb16startdma(void)
{
ulong count;
int speed;
ilock(&blaster);
dmaend(blaster.dma);
if(audio.amode == Aread) {
sbcmd(0x42); /* input sampling rate */
speed = audio.livol[Vspeed];
} else {
sbcmd(0x41); /* output sampling rate */
speed = audio.lovol[Vspeed];
}
sbcmd(speed>>8);
sbcmd(speed);
count = (Bufsize >> 1) - 1;
if(audio.amode == Aread)
sbcmd(0xbe); /* A/D, autoinit */
else
sbcmd(0xb6); /* D/A, autoinit */
sbcmd(0x30); /* stereo, 16 bit */
sbcmd(count);
sbcmd(count>>8);
audio.active = 1;
contindma();
iunlock(&blaster);
}
static int
ess1688reset(void)
{
int i;
outb(blaster.reset, 3);
delay(1); /* >3 υs */
outb(blaster.reset, 0);
delay(1);
i = sbread();
if(i != 0xAA) {
print("#A: no response %#.2x\n", i);
return 1;
}
if(sbcmd(0xC6)){ /* extended mode */
print("#A: barf 3\n");
return 1;
}
return 0;
}
static void
ess1688startdma(void)
{
ulong count;
int speed, x;
ilock(&blaster);
dmaend(blaster.dma);
if(audio.amode == Awrite)
ess1688reset();
if(audio.amode == Aread)
sbcmd(0xD3); /* speaker off */
/*
* Set the speed.
*/
if(audio.amode == Aread)
speed = audio.livol[Vspeed];
else
speed = audio.lovol[Vspeed];
if(speed < 4000)
speed = 4000;
else if(speed > 48000)
speed = 48000;
if(speed > 22000)
x = 0x80|(256-(795500+speed/2)/speed);
else
x = 128-(397700+speed/2)/speed;
ess1688w(0xA1, x & 0xFF);
speed = (speed * 9) / 20;
x = 256 - 7160000 / (speed * 82);
ess1688w(0xA2, x & 0xFF);
if(audio.amode == Aread)
ess1688w(0xB8, 0x0E); /* A/D, autoinit */
else
ess1688w(0xB8, 0x04); /* D/A, autoinit */
x = ess1688r(0xA8) & ~0x03;
ess1688w(0xA8, x|0x01); /* 2 channels */
ess1688w(0xB9, 2); /* demand mode, 4 bytes per request */
if(audio.amode == Awrite)
ess1688w(0xB6, 0);
ess1688w(0xB7, 0x71);
ess1688w(0xB7, 0xBC);
x = ess1688r(0xB1) & 0x0F;
ess1688w(0xB1, x|0x50);
x = ess1688r(0xB2) & 0x0F;
ess1688w(0xB2, x|0x50);
if(audio.amode == Awrite)
sbcmd(0xD1); /* speaker on */
count = -Bufsize;
ess1688w(0xA4, count & 0xFF);
ess1688w(0xA5, (count>>8) & 0xFF);
x = ess1688r(0xB8);
ess1688w(0xB8, x|0x05);
audio.active = 1;
contindma();
iunlock(&blaster);
}
/*
* if audio is stopped,
* start it up again.
*/
static void
pokeaudio(void)
{
if(!audio.active)
blaster.startdma();
}
static void
sb16intr(void)
{
int stat, dummy;
stat = mxread(0x82) & 7; /* get irq status */
if(stat) {
dummy = 0;
if(stat & 2) {
ilock(&blaster);
dummy = inb(blaster.clri16);
contindma();
iunlock(&blaster);
audio.intr = 1;
wakeup(&audio.vous);
}
if(stat & 1) {
dummy = inb(blaster.clri8);
}
if(stat & 4) {
dummy = inb(blaster.clri401);
}
USED(dummy);
}
}
static void
ess1688intr(void)
{
int dummy;
if(audio.active){
ilock(&blaster);
contindma();
dummy = inb(blaster.clri8);
iunlock(&blaster);
audio.intr = 1;
wakeup(&audio.vous);
USED(dummy);
}
else
print("#A: unexpected ess1688 interrupt\n");
}
void
audiosbintr(void)
{
/*
* Carrera interrupt interface.
*/
blaster.intr();
}
static void
pcaudiosbintr(Ureg*, void*)
{
/*
* x86 interrupt interface.
*/
blaster.intr();
}
void
audiodmaintr(void)
{
/* print("#A: dma interrupt\n"); /**/
}
static int
anybuf(void*)
{
return audio.intr;
}
/*
* wait for some output to get
* empty buffers back.
*/
static void
waitaudio(void)
{
audio.intr = 0;
pokeaudio();
tsleep(&audio.vous, anybuf, 0, 10000);
if(audio.intr == 0) {
/* print("#A: audio timeout\n"); /**/
audio.active = 0;
pokeaudio();
}
}
static void
sbbufinit(void)
{
int i;
uchar *p;
p = (uchar*)(((ulong)xalloc((Nbuf+1) * Bufsize) + Bufsize-1) &
~(Bufsize-1));
if (p == nil)
panic("sbbufinit: no memory");
for(i=0; i<Nbuf; i++) {
dcflush(p, Bufsize);
audio.buf[i].virt = UNCACHED(uchar, p);
audio.buf[i].phys = (ulong)PADDR(p);
p += Bufsize;
}
}
static void
setempty(void)
{
int i;
ilock(&blaster);
audio.empty.first = 0;
audio.empty.last = 0;
audio.full.first = 0;
audio.full.last = 0;
audio.current = 0;
audio.filling = 0;
audio.buffered = 0;
for(i=0; i<Nbuf; i++)
putbuf(&audio.empty, &audio.buf[i]);
audio.totcount = 0;
audio.tottime = 0LL;
iunlock(&blaster);
}
static void
resetlevel(void)
{
int i;
for(i=0; volumes[i].name; i++) {
audio.lovol[i] = volumes[i].ilval;
audio.rovol[i] = volumes[i].irval;
audio.livol[i] = volumes[i].ilval;
audio.rivol[i] = volumes[i].irval;
}
}
static int
ess1688(ISAConf* sbconf)
{
int i, major, minor;
/*
* Try for ESS1688.
*/
sbcmd(0xE7); /* get version */
major = sbread();
minor = sbread();
if(major != 0x68 || minor != 0x8B){
print("#A: model %#.2x %#.2x; not ESS1688 compatible\n", major, minor);
return 1;
}
ess1688reset();
switch(sbconf->irq){
case 2:
case 9:
i = 0x50|(0<<2);
break;
case 5:
i = 0x50|(1<<2);
break;
case 7:
i = 0x50|(2<<2);
break;
case 10:
i = 0x50|(3<<2);
break;
default:
print("#A: bad ESS1688 irq %d\n", sbconf->irq);
return 1;
}
ess1688w(0xB1, i);
switch(sbconf->dma){
case 0:
i = 0x50|(1<<2);
break;
case 1:
i = 0xF0|(2<<2);
break;
case 3:
i = 0x50|(3<<2);
break;
default:
print("#A: bad ESS1688 dma %lud\n", sbconf->dma);
return 1;
}
ess1688w(0xB2, i);
ess1688reset();
blaster.startdma = ess1688startdma;
blaster.intr = ess1688intr;
return 0;
}
static void
audioinit(void)
{
ISAConf sbconf;
int i, x;
static int irq[] = {2,5,7,10};
sbconf.port = 0x220;
sbconf.dma = Dma;
sbconf.irq = IrqAUDIO;
if(isaconfig("audio", 0, &sbconf) == 0)
return;
if(sbconf.type == nil ||
(cistrcmp(sbconf.type, "sb16") != 0 &&
cistrcmp(sbconf.type, "ess1688") != 0))
return;
switch(sbconf.port){
case 0x220:
case 0x240:
case 0x260:
case 0x280:
break;
default:
print("#A: bad port %#lux\n", sbconf.port);
return;
}
if(ioalloc(sbconf.port, 0x10, 0, "audio") < 0){
print("#A: cannot ioalloc range %lux+0x10\n", sbconf.port);
return;
}
if(ioalloc(sbconf.port+0x100, 1, 0, "audio.mpu401") < 0){
iofree(sbconf.port);
print("#A: cannot ioalloc range %lux+0x01\n", sbconf.port+0x100);
return;
}
switch(sbconf.irq){
case 2:
case 5:
case 7:
case 9:
case 10:
break;
default:
print("#A: bad irq %d\n", sbconf.irq);
iofree(sbconf.port);
iofree(sbconf.port+0x100);
return;
}
blaster.reset = sbconf.port + 0x6;
blaster.read = sbconf.port + 0xa;
blaster.write = sbconf.port + 0xc;
blaster.wstatus = sbconf.port + 0xc;
blaster.rstatus = sbconf.port + 0xe;
blaster.mixaddr = sbconf.port + 0x4;
blaster.mixdata = sbconf.port + 0x5;
blaster.clri8 = sbconf.port + 0xe;
blaster.clri16 = sbconf.port + 0xf;
blaster.clri401 = sbconf.port + 0x100;
blaster.dma = sbconf.dma;
blaster.startdma = sb16startdma;
blaster.intr = sb16intr;
audio.amode = Aclosed;
resetlevel();
outb(blaster.reset, 1);
delay(1); /* >3 υs */
outb(blaster.reset, 0);
delay(1);
i = sbread();
if(i != 0xaa) {
print("#A: no response #%.2x\n", i);
iofree(sbconf.port);
iofree(sbconf.port+0x100);
return;
}
sbcmd(0xe1); /* get version */
audio.major = sbread();
audio.minor = sbread();
if(audio.major != 4) {
if(audio.major != 3 || audio.minor != 1 || ess1688(&sbconf)){
print("#A: model %#.2x %#.2x; not SB 16 compatible\n",
audio.major, audio.minor);
iofree(sbconf.port);
iofree(sbconf.port+0x100);
return;
}
audio.major = 4;
}
/*
* initialize the mixer
*/
mxcmd(0x00, 0); /* Reset mixer */
mxvolume();
/*
* Attempt to set IRQ/DMA channels.
* On old ISA boards, these registers are writable.
* On Plug-n-Play boards, these are read-only.
*
* To accomodate both, we write to the registers,
* but then use the contents in case the write is
* disallowed.
*/
mxcmd(0x80, /* irq */
(sbconf.irq==2)? 1:
(sbconf.irq==5)? 2:
(sbconf.irq==7)? 4:
(sbconf.irq==9)? 1:
(sbconf.irq==10)? 8:
0);
mxcmd(0x81, 1<<blaster.dma); /* dma */
x = mxread(0x81);
for(i=5; i<=7; i++)
if(x & (1<<i)){
blaster.dma = i;
break;
}
x = mxread(0x80);
for(i=0; i<=3; i++)
if(x & (1<<i)){
sbconf.irq = irq[i];
break;
}
seteisadma(blaster.dma, audiodmaintr);
setvec(Int0vec+sbconf.irq, pcaudiosbintr, 0);
}
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)
{
audiodir[Qaudio].length = audio.buffered;
return devstat(c, db, n, audiodir, nelem(audiodir), devgen);
}
static Chan*
audioopen(Chan *c, int omode)
{
int amode;
if(audio.major != 4)
error(Emajor);
switch((ulong)c->qid.path) {
default:
error(Eperm);
break;
case Qstatus:
if((omode&7) != OREAD)
error(Eperm);
case Qvolume:
case Qdir:
break;
case Qaudio:
amode = Awrite;
if((omode&7) == OREAD)
amode = Aread;
qlock(&audio);
if(audio.amode != Aclosed){
qunlock(&audio);
error(Einuse);
}
if(audio.bufinit == 0) {
audio.bufinit = 1;
sbbufinit();
}
audio.amode = amode;
setempty();
audio.curcount = 0;
qunlock(&audio);
mxvolume();
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)
{
Buf *b;
switch((ulong)c->qid.path) {
default:
error(Eperm);
break;
case Qdir:
case Qvolume:
case Qstatus:
break;
case Qaudio:
if(c->flag & COPEN) {
qlock(&audio);
if(audio.amode == Awrite) {
/* flush out last partial buffer */
b = audio.filling;
if(b) {
audio.filling = 0;
memset(b->virt+audio.curcount, 0, Bufsize-audio.curcount);
audio.buffered += Bufsize-audio.curcount;
swab(b->virt);
putbuf(&audio.full, b);
}
if(!audio.active && audio.full.first)
pokeaudio();
}
audio.amode = Aclosed;
if(waserror()){
qunlock(&audio);
nexterror();
}
while(audio.active)
waitaudio();
setempty();
poperror();
qunlock(&audio);
}
break;
}
}
static long
audioread(Chan *c, void *v, long n, vlong off)
{
int liv, riv, lov, rov;
long m, n0;
char buf[300];
Buf *b;
int j;
ulong offset = off;
char *a;
n0 = n;
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);
qlock(&audio);
if(waserror()){
qunlock(&audio);
nexterror();
}
while(n > 0) {
b = audio.filling;
if(b == 0) {
b = getbuf(&audio.full);
if(b == 0) {
waitaudio();
continue;
}
audio.filling = b;
swab(b->virt);
audio.curcount = 0;
}
m = Bufsize-audio.curcount;
if(m > n)
m = n;
memmove(a, b->virt+audio.curcount, m);
audio.curcount += m;
n -= m;
a += m;
audio.buffered -= m;
if(audio.curcount >= Bufsize) {
audio.filling = 0;
putbuf(&audio.empty, b);
}
}
poperror();
qunlock(&audio);
break;
case Qstatus:
buf[0] = 0;
snprint(buf, sizeof(buf), "bufsize %6d buffered %6d offset %10lud time %19lld\n",
Bufsize, audio.buffered, audio.totcount, audio.tottime);
return readstr(offset, a, n, buf);
case Qvolume:
j = 0;
buf[0] = 0;
for(m=0; volumes[m].name; m++){
liv = audio.livol[m];
riv = audio.rivol[m];
lov = audio.lovol[m];
rov = audio.rovol[m];
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 n0-n;
}
static long
audiowrite(Chan *c, void *vp, long n, vlong)
{
long m, n0;
int i, v, left, right, in, out;
Cmdbuf *cb;
Buf *b;
char *a;
a = vp;
n0 = n;
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);
if(left && out)
audio.lovol[v] = m;
if(left && in)
audio.livol[v] = m;
if(right && out)
audio.rovol[v] = m;
if(right && in)
audio.rivol[v] = m;
mxvolume();
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();
mxvolume();
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);
qlock(&audio);
if(waserror()){
qunlock(&audio);
nexterror();
}
while(n > 0) {
b = audio.filling;
if(b == 0) {
b = getbuf(&audio.empty);
if(b == 0) {
waitaudio();
continue;
}
audio.filling = b;
audio.curcount = 0;
}
m = Bufsize-audio.curcount;
if(m > n)
m = n;
memmove(b->virt+audio.curcount, a, m);
audio.curcount += m;
n -= m;
a += m;
audio.buffered += m;
if(audio.curcount >= Bufsize) {
audio.filling = 0;
swab(b->virt);
putbuf(&audio.full, b);
pokeaudio();
}
}
poperror();
qunlock(&audio);
break;
}
return n0 - n;
}
static void
swab(uchar *a)
{
ulong *p, *ep, b;
if(!SBswab){
USED(a);
return;
}
p = (ulong*)a;
ep = p + (Bufsize>>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,
};