1/*
2 * Copyright (c) 1999 Cameron Grant <gandalf@vilnya.demon.co.uk>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: head/sys/dev/sound/pcm/channel.h 67652 2000-10-26 20:46:58Z cg $
27 */
28
29int chn_reinit(pcm_channel *c);
30int chn_write(pcm_channel *c, struct uio *buf);
31int chn_read(pcm_channel *c, struct uio *buf);
32u_int32_t chn_start(pcm_channel *c, int force);
33int chn_sync(pcm_channel *c, int threshold);
34int chn_flush(pcm_channel *c);
35int chn_poll(pcm_channel *c, int ev, struct proc *p);
36

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80#define CHN_F_NOTRIGGER 0x00000040
81
82#define CHN_F_BUSY 0x00001000 /* has been opened */
83#define CHN_F_HAS_SIZE 0x00002000 /* user set block size */
84#define CHN_F_NBIO 0x00004000 /* do non-blocking i/o */
85#define CHN_F_INIT 0x00008000 /* changed parameters. need init */
86#define CHN_F_MAPPED 0x00010000 /* has been mmap()ed */
87#define CHN_F_DEAD 0x00020000
88
89
90#define CHN_F_RESET (CHN_F_BUSY | CHN_F_DEAD)
91
92/*
93 * This should be large enough to hold all pcm data between
94 * tsleeps in chn_{read,write} at the highest sample rate.
95 * (which is usually 48kHz * 16bit * stereo = 192000 bytes/sec)
96 */
97#define CHN_2NDBUFBLKSIZE (2 * 1024)
98/* The total number of blocks per secondary buffer. */
99#define CHN_2NDBUFBLKNUM (32)
100/* The size of a whole secondary buffer. */
101#define CHN_2NDBUFMAXSIZE (131072)