1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 1999 Cameron Grant <cg@freebsd.org> 5 * All rights reserved. 6 * Copyright (c) 2025 The FreeBSD Foundation 7 * 8 * Portions of this software were developed by Christos Margiolis 9 * <christos@FreeBSD.org> under sponsorship from the FreeBSD Foundation. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #define SNDBUF_F_MANAGED 0x00000001 34 35 #define SNDBUF_NAMELEN 48 36 37 struct snd_dbuf { 38 u_int8_t *buf, *tmpbuf; 39 u_int8_t *shadbuf; /**< shadow buffer used w/ S_D_SILENCE/SKIP */ 40 volatile int sl; /**< shadbuf ready length in # of bytes */ 41 unsigned int bufsize, maxsize, allocsize; 42 volatile int dl; /* transfer size */ 43 volatile int rp; /* pointers to the ready area */ 44 volatile int rl; /* length of ready area */ 45 volatile int hp; 46 volatile u_int64_t total, prev_total; 47 int dmachan; /* dma channel */ 48 u_int32_t fmt, spd, bps, align; 49 unsigned int blksz, blkcnt; 50 int xrun; 51 u_int32_t flags; 52 bus_dmamap_t dmamap; 53 bus_dma_tag_t dmatag; 54 bus_addr_t buf_addr; 55 int dmaflags; 56 struct selinfo sel; 57 struct pcm_channel *channel; 58 char name[SNDBUF_NAMELEN]; 59 }; 60 61 struct snd_dbuf *sndbuf_create(struct pcm_channel *channel, const char *desc); 62 void sndbuf_destroy(struct snd_dbuf *b); 63 64 int sndbuf_alloc(struct snd_dbuf *b, bus_dma_tag_t dmatag, int dmaflags, unsigned int size); 65 int sndbuf_setup(struct snd_dbuf *b, void *buf, unsigned int size); 66 void sndbuf_free(struct snd_dbuf *b); 67 int sndbuf_resize(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz); 68 int sndbuf_remalloc(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz); 69 void sndbuf_reset(struct snd_dbuf *b); 70 void sndbuf_clear(struct snd_dbuf *b, unsigned int length); 71 void sndbuf_fillsilence(struct snd_dbuf *b); 72 void sndbuf_fillsilence_rl(struct snd_dbuf *b, u_int rl); 73 void sndbuf_softreset(struct snd_dbuf *b); 74 void sndbuf_clearshadow(struct snd_dbuf *b); 75 76 int sndbuf_setfmt(struct snd_dbuf *b, u_int32_t fmt); 77 void sndbuf_setspd(struct snd_dbuf *b, unsigned int spd); 78 79 void *sndbuf_getbufofs(struct snd_dbuf *b, unsigned int ofs); 80 unsigned int sndbuf_runsz(struct snd_dbuf *b); 81 void sndbuf_setrun(struct snd_dbuf *b, int go); 82 83 void sndbuf_setxrun(struct snd_dbuf *b, unsigned int xrun); 84 unsigned int sndbuf_getfree(struct snd_dbuf *b); 85 unsigned int sndbuf_getfreeptr(struct snd_dbuf *b); 86 unsigned int sndbuf_getready(struct snd_dbuf *b); 87 unsigned int sndbuf_getreadyptr(struct snd_dbuf *b); 88 u_int64_t sndbuf_getblocks(struct snd_dbuf *b); 89 unsigned int sndbuf_xbytes(unsigned int v, struct snd_dbuf *from, struct snd_dbuf *to); 90 u_int8_t sndbuf_zerodata(u_int32_t fmt); 91 92 int sndbuf_acquire(struct snd_dbuf *b, u_int8_t *from, unsigned int count); 93 int sndbuf_dispose(struct snd_dbuf *b, u_int8_t *to, unsigned int count); 94 int sndbuf_feed(struct snd_dbuf *from, struct snd_dbuf *to, struct pcm_channel *channel, struct pcm_feeder *feeder, unsigned int count); 95 96 #ifdef OSSV4_EXPERIMENT 97 void sndbuf_getpeaks(struct snd_dbuf *b, int *lp, int *rp); 98 #endif 99 100 static inline u_int32_t 101 snd_xbytes(u_int32_t v, u_int32_t from, u_int32_t to) 102 { 103 104 if (from == to) 105 return (v); 106 if (from == 0) 107 return (0); 108 return ((u_int64_t)v * to / from); 109 } 110