update code dealing with snd_dbuf objects to do so using a functional interface

modify chn_setblocksize() to pick a default soft-blocksize appropriate to the
sample rate and format in use.  it will aim for a power of two size small
enough to generate block sizes of at most 20ms.  it will also set the
hard-blocksize taking into account rate/format conversions in use.

update drivers to implement setblocksize  correctly:
updated, tested: 	sb16, emu10k1, maestro, solo
updated, untested: 	ad1816, ess, mss, sb8, csa
not updated: 		ds1, es137x, fm801, neomagic, t4dwave, via82c686

i lack hardware to test: ad1816, csa, fm801, neomagic
others will be updated/tested in the next few days.

1 files changed, 9 insertions, 5 deletions

diff --git a/sys/dev/sound/pcm/dsp.c b/sys/dev/sound/pcm/dsp.c
index 59c14e9..9728afd 100644
--- a/sys/dev/sound/pcm/dsp.c
+++ b/sys/dev/sound/pcm/dsp.c
@@ -240,8 +240,10 @@ dsp_ioctl(snddev_info *d, int chan, u_long cmd, caddr_t arg)
     	case AIOGSIZE:	/* get the current blocksize */
 		{
 	    		struct snd_size *p = (struct snd_size *)arg;
-	    		if (wrch) p->play_size = wrch->buffer2nd.blksz;
-	    		if (rdch) p->rec_size = rdch->buffer2nd.blksz;
+	    		if (wrch)
+				p->play_size = wrch->buffer2nd.blksz;
+	    		if (rdch)
+				p->rec_size = rdch->buffer2nd.blksz;
 		}
 		break;
 
@@ -287,14 +289,16 @@ dsp_ioctl(snddev_info *d, int chan, u_long cmd, caddr_t arg)
 			if (rdch && wrch)
 				p->formats |= (d->flags & SD_F_SIMPLEX)? 0 : AFMT_FULLDUPLEX;
 	    		p->mixers = 1; /* default: one mixer */
-	    		p->inputs = d->mixer->devs;
+	    		p->inputs = mix_getdevs(d->mixer);
 	    		p->left = p->right = 100;
 		}
 		break;
 
     	case AIOSTOP:
-		if (*arg_i == AIOSYNC_PLAY && wrch) *arg_i = chn_abort(wrch);
-		else if (*arg_i == AIOSYNC_CAPTURE && rdch) *arg_i = chn_abort(rdch);
+		if (*arg_i == AIOSYNC_PLAY && wrch)
+			*arg_i = chn_abort(wrch);
+		else if (*arg_i == AIOSYNC_CAPTURE && rdch)
+			*arg_i = chn_abort(rdch);
 		else {
 	   	 	printf("AIOSTOP: bad channel 0x%x\n", *arg_i);
 	    		*arg_i = 0;