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, 49 insertions, 0 deletions

diff --git a/sys/dev/sound/pcm/buffer.h b/sys/dev/sound/pcm/buffer.h
new file mode 100644
index 0000000..62058ce
--- /dev/null
+++ b/sys/dev/sound/pcm/buffer.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 1999 Cameron Grant <gandalf@vilnya.demon.co.uk>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#define ISA_DMA(b) (((b)->chan >= 0 && (b)->chan != 4 && (b)->chan < 8))
+
+int sndbuf_alloc(snd_dbuf *b, bus_dma_tag_t dmatag, int size);
+int sndbuf_setup(snd_dbuf *b, void *buf, int size);
+void sndbuf_free(snd_dbuf *b);
+int sndbuf_resize(snd_dbuf *b, int blkcnt, int blksz);
+void sndbuf_reset(snd_dbuf *b);
+void sndbuf_clear(snd_dbuf *b, int length);
+int sndbuf_setfmt(snd_dbuf *b, u_int32_t fmt);
+int sndbuf_getbps(snd_dbuf *b);
+void *sndbuf_getbuf(snd_dbuf *b);
+int sndbuf_getsize(snd_dbuf *b);
+int sndbuf_runsz(snd_dbuf *b);
+
+int sndbuf_isadmasetup(snd_dbuf *b, struct resource *drq);
+int sndbuf_isadmasetdir(snd_dbuf *b, int dir);
+void sndbuf_isadma(snd_dbuf *b, int go);
+int sndbuf_isadmaptr(snd_dbuf *b);
+void sndbuf_isadmabounce(snd_dbuf *b);
+
+