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/*
* 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.
*
* $FreeBSD$
*/
int chn_reinit(pcm_channel *c);
int chn_write(pcm_channel *c, struct uio *buf);
int chn_read(pcm_channel *c, struct uio *buf);
int chn_sync(pcm_channel *c, int threshold);
int chn_flush(pcm_channel *c);
int chn_poll(pcm_channel *c, int ev, struct proc *p);
int chn_init(pcm_channel *c, void *devinfo, int dir);
int chn_setdir(pcm_channel *c, int dir);
int chn_reset(pcm_channel *c);
int chn_setvolume(pcm_channel *c, int left, int right);
int chn_setspeed(pcm_channel *c, int speed);
int chn_setformat(pcm_channel *c, u_int32_t fmt);
int chn_setblocksize(pcm_channel *c, int blksz);
int chn_trigger(pcm_channel *c, int go);
int chn_getptr(pcm_channel *c);
pcmchan_caps *chn_getcaps(pcm_channel *c);
int chn_allocbuf(snd_dbuf *b, bus_dma_tag_t parent_dmat);
void chn_resetbuf(pcm_channel *c);
void chn_intr(pcm_channel *c);
void chn_checkunderflow(pcm_channel *c);
int chn_wrfeed(pcm_channel *c);
int chn_rdfeed(pcm_channel *c);
int chn_abort(pcm_channel *c);
void buf_isadma(snd_dbuf *b, int go);
int buf_isadmaptr(snd_dbuf *b);
int chn_feedchain(pcm_channel *c);
extern pcm_feeder feeder_root;
#define PCMDIR_PLAY 1
#define PCMDIR_REC -1
#define PCMTRIG_START 1
#define PCMTRIG_EMLDMAWR 2
#define PCMTRIG_STOP 0
#define PCMTRIG_ABORT -1
#define CHN_F_READING 0x00000001 /* have a pending read */
#define CHN_F_WRITING 0x00000002 /* have a pending write */
#define CHN_F_CLOSING 0x00000004 /* a pending close */
#define CHN_F_ABORTING 0x00000008 /* a pending abort */
#define CHN_F_PENDING_IO (CHN_F_READING | CHN_F_WRITING)
#define CHN_F_RUNNING 0x00000010 /* dma is running */
#define CHN_F_TRIGGERED 0x00000020
#define CHN_F_BUSY 0x00001000 /* has been opened */
#define CHN_F_HAS_SIZE 0x00002000 /* user set block size */
#define CHN_F_NBIO 0x00004000 /* do non-blocking i/o */
#define CHN_F_INIT 0x00008000 /* changed parameters. need init */
#define CHN_F_MAPPED 0x00010000 /* has been mmap()ed */
#define CHN_F_RESET (CHN_F_BUSY)
/*
* This should be large enough to hold all pcm data between
* tsleeps in chn_{read,write} at the highest sample rate.
* (which is usually 48kHz * 16bit * stereo = 192000 bytes/sec)
*/
#define CHN_2NDBUFBLKSIZE (2 * 1024)
/* The total number of blocks per secondary buffer. */
#define CHN_2NDBUFBLKNUM (8)
/* The size of a whole secondary buffer. */
#define CHN_2NDBUFWHOLESIZE (CHN_2NDBUFBLKSIZE * CHN_2NDBUFBLKNUM)
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