channel.h revision 59020
1167465Smp/* 259243Sobrien * Copyright (c) 1999 Cameron Grant <gandalf@vilnya.demon.co.uk> 359243Sobrien * All rights reserved. 459243Sobrien * 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 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 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 59020 2000-04-05 00:56:02Z 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); 32int chn_sync(pcm_channel *c, int threshold); 33int chn_flush(pcm_channel *c); 34int chn_poll(pcm_channel *c, int ev, struct proc *p); 35 36int chn_init(pcm_channel *c, void *devinfo, int dir); 37int chn_setdir(pcm_channel *c, int dir); 38int chn_reset(pcm_channel *c); 39int chn_setvolume(pcm_channel *c, int left, int right); 40int chn_setspeed(pcm_channel *c, int speed); 41int chn_setformat(pcm_channel *c, u_int32_t fmt); 42int chn_setblocksize(pcm_channel *c, int blksz); 43int chn_trigger(pcm_channel *c, int go); 44int chn_getptr(pcm_channel *c); 45pcmchan_caps *chn_getcaps(pcm_channel *c); 46 47int chn_allocbuf(snd_dbuf *b, bus_dma_tag_t parent_dmat); 48void chn_resetbuf(pcm_channel *c); 49void chn_intr(pcm_channel *c); 50void chn_checkunderflow(pcm_channel *c); 51int chn_wrfeed(pcm_channel *c); 52int chn_rdfeed(pcm_channel *c); 53int chn_abort(pcm_channel *c); 54 55void buf_isadma(snd_dbuf *b, int go); 56int buf_isadmaptr(snd_dbuf *b); 57int chn_feedchain(pcm_channel *c); 58 59extern pcm_feeder feeder_root; 60 61#define PCMDIR_PLAY 1 62#define PCMDIR_REC -1 63 64#define PCMTRIG_START 1 65#define PCMTRIG_EMLDMAWR 2 66#define PCMTRIG_STOP 0 67#define PCMTRIG_ABORT -1 68 69#define CHN_F_READING 0x00000001 /* have a pending read */ 70#define CHN_F_WRITING 0x00000002 /* have a pending write */ 71#define CHN_F_CLOSING 0x00000004 /* a pending close */ 72#define CHN_F_ABORTING 0x00000008 /* a pending abort */ 73#define CHN_F_PENDING_IO (CHN_F_READING | CHN_F_WRITING) 74#define CHN_F_RUNNING 0x00000010 /* dma is running */ 75#define CHN_F_TRIGGERED 0x00000020 76 77#define CHN_F_BUSY 0x00001000 /* has been opened */ 78#define CHN_F_HAS_SIZE 0x00002000 /* user set block size */ 79#define CHN_F_NBIO 0x00004000 /* do non-blocking i/o */ 80#define CHN_F_INIT 0x00008000 /* changed parameters. need init */ 81#define CHN_F_MAPPED 0x00010000 /* has been mmap()ed */ 82 83 84#define CHN_F_RESET (CHN_F_BUSY) 85 86/* 87 * This should be large enough to hold all pcm data between 88 * tsleeps in chn_{read,write} at the highest sample rate. 89 * (which is usually 48kHz * 16bit * stereo = 192000 bytes/sec) 90 */ 91#define CHN_2NDBUFBLKSIZE (2 * 1024) 92/* The total number of blocks per secondary buffer. */ 93#define CHN_2NDBUFBLKNUM (32) 94/* The size of a whole secondary buffer. */ 95#define CHN_2NDBUFWHOLESIZE (CHN_2NDBUFBLKSIZE * CHN_2NDBUFBLKNUM) 96