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, 2 insertions, 3 deletions

diff --git a/sys/dev/sound/pci/fm801.c b/sys/dev/sound/pci/fm801.c
index a01ea8e..33b9915 100644
--- a/sys/dev/sound/pci/fm801.c
+++ b/sys/dev/sound/pci/fm801.c
@@ -331,9 +331,8 @@ fm801ch_init(kobj_t obj, void *devinfo, snd_dbuf *b, pcm_channel *c, int dir)
 	ch->parent = fm801;
 	ch->channel = c;
 	ch->buffer = b;
-	ch->buffer->bufsize = FM801_BUFFSIZE;
 	ch->dir = dir;
-	if( chn_allocbuf(ch->buffer, fm801->parent_dmat) == -1) return NULL;
+	if (sndbuf_alloc(ch->buffer, fm801->parent_dmat, FM801_BUFFSIZE) == -1) return NULL;
 	return (void *)ch;
 }
 
@@ -435,7 +434,7 @@ fm801ch_trigger(kobj_t obj, void *data, int go)
 {
 	struct fm801_chinfo *ch = data;
 	struct fm801_info *fm801 = ch->parent;
-	u_int32_t baseaddr = vtophys(ch->buffer->buf);
+	u_int32_t baseaddr = vtophys(sndbuf_getbuf(ch->buffer));
 	snd_dbuf *b = ch->buffer;
 	u_int32_t k1;