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
snd_xbytes(u_int32_t v,u_int32_t from,u_int32_t to)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