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|
--- dacio-linux.c.orig Sun Sep 17 05:51:43 1995
+++ dacio-linux.c Thu Aug 22 20:42:04 2002
@@ -3,7 +3,11 @@
#include <fcntl.h> /*O_WRONLY*/
#include <sys/ioctl.h> /*(ioctl)*/
#include <unistd.h> /*(write)*/
+#if defined(LINUX) || defined(__FreeBSD__)
#include <sys/soundcard.h> /*SNDCTL_XXX*/
+#else
+#include <machine/soundcard.h>
+#endif
#include <errno.h> /*EINTR*/
#include "defs.h" /*u8,u16*/
#include "dacio.h" /*(dacioXXX)*/
@@ -47,7 +51,7 @@
static struct {
union {
u8 *p8;
- u16 *p16;
+ i15 *p16;
} p;
u8 *top;
u8 *bot;
@@ -67,11 +71,39 @@
exit(1);
}
#endif
- tmp = AFMT_U8;
+ switch (dcp->bits) {
+ case 0:
+ case 8:
+ dcp->bits = 8;
+ tmp = AFMT_U8; break;
+ case 16:
+ tmp = AFMT_S16_LE; break;
+ default:
+ fprintf(stderr, "Don't know how to handle %d bit output.\n", dcp->bits);
+ exit(1);
+ break;
+ }
+
if (ioctl(fd, SNDCTL_DSP_SETFMT, &tmp) < 0) {
perror("dacioConf");
exit(1);
}
+
+ switch (tmp) {
+ case AFMT_U8:
+ if (dcp->bits != 8) {
+ fprintf(stderr, "soundcard doesn't support 8bits.\n");
+ exit(1);
+ }
+ break;
+ case AFMT_S16_LE:
+ if (dcp->bits != 16) {
+ fprintf(stderr, "soundcard doesn't support 16bits.\n");
+ exit(1);
+ }
+ break;
+ }
+
/*fprintf(stderr, "fmt = 0x%x\n", tmp);*/
if (ioctl(fd, SNDCTL_DSP_STEREO, &dcp->stereo) < 0) {
@@ -90,10 +122,15 @@
perror("dacioConf");
exit(1);
}
+ /*fprintf(stderr, "sound buffer size = 0x%x\n", buf.size);*/
+ tmp = buf.size;
+ while (tmp <= (0.1 * (dcp->speed * (dcp->stereo+1) * (dcp->bits/8))))
+ tmp += buf.size;
+ buf.size = tmp;
/*fprintf(stderr, "buffer size = 0x%x\n", buf.size);*/
dci = *dcp;
/*if (buf.top != NULL) free(buf.top);*/
- buf.top = memPerm(buf.size * sizeof(u8));
+ buf.top = memPerm(buf.size);
buf.p.p8 = buf.top;
buf.bot = buf.top + buf.size;
}
@@ -115,7 +152,14 @@
int s;
if (buf.p.p8 <= buf.top) return;
- for ( ; buf.p.p8 < buf.bot; buf.p.p8++) *buf.p.p8 = 128;
+ switch (dci.bits) {
+ case 8:
+ for ( ; buf.p.p8 < buf.bot; buf.p.p8++) *buf.p.p8 = 128;
+ break;
+ case 16:
+ for ( ; buf.p.p8 < buf.bot; buf.p.p16++) *buf.p.p16 = 0;
+ break;
+ }
RETRY:
s = write(fd, buf.top, buf.size);
if (s < buf.size) {
@@ -179,6 +223,8 @@
(tmpvar & ~255)? ~tmpvar >> 16 : tmpvar ) /* 16 will be OK */
/* ~(tmpvar >> 16) makes longer asm */
#endif
+#define to16bit(x) \
+ (((x) * gv) >> 12)
/* stereo */
static void
@@ -186,14 +232,26 @@
{
const i31 *inbufp = inbuf.p;
u8 *u8p = buf.p.p8;
+ i15 *s15p = buf.p.p16;
- for (; n > 0; n--) {
- i31x tmp;
- *u8p++ = to8bit(*inbufp++, tmp); /* L */
- *u8p++ = to8bit(*inbufp++, tmp); /* R */
+ switch (dci.bits) {
+ case 8:
+ for (; n > 0; n--) {
+ i31x tmp;
+ *u8p++ = to8bit(*inbufp++, tmp); /* L */
+ *u8p++ = to8bit(*inbufp++, tmp); /* R */
+ }
+ buf.p.p8 = u8p;
+ break;
+ case 16:
+ for (; n > 0; n--) {
+ *s15p++ = to16bit(*inbufp++); /* L */
+ *s15p++ = to16bit(*inbufp++); /* R */
+ }
+ buf.p.p16 = s15p;
+ break;
}
inbuf.p = inbufp;
- buf.p.p8 = u8p;
}
/* mono */
@@ -202,19 +260,31 @@
{
const i31 *inbufp = inbuf.p;
u8 *u8p = buf.p.p8;
+ i15 *s16p = buf.p.p16;
- for (; n > 0; n--) {
- i31x tmp;
- *u8p++ = to8bit(*inbufp, tmp);
- inbufp += 2;
+ switch (dci.bits) {
+ case 8:
+ for (; n > 0; n--) {
+ i31x tmp;
+ *u8p++ = to8bit(*inbufp, tmp);
+ inbufp += 2;
+ }
+ buf.p.p8 = u8p;
+ break;
+ case 16:
+ for (; n > 0; n--) {
+ *s16p++ = to16bit(*inbufp);
+ inbufp += 2;
+ }
+ buf.p.p16 = s16p;
+ break;
}
inbuf.p = inbufp;
- buf.p.p8 = u8p;
}
#define dacioOutHirev(x) \
if (dci.stereo) dacioOutHirevS(x); else dacioOutHirevM(x)
-#define bufRest() (dci.stereo? (buf.bot - buf.p.p8)/2 : buf.bot - buf.p.p8)
+#define bufRest() ((dci.stereo? (buf.bot - buf.p.p8)/2 : buf.bot - buf.p.p8)/(dci.bits/8))
void
dacioOut(void)
|
