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hardware imposes strict limitations on hard buffer and block sizes. Previous code set soft buffer to be no smaller then hard buffer. On some cards with fixed 64K physical buffer that caused up to 800ms play latency. New code allows to set soft buffer size down to just two blocks of the hard buffer and to not write more then that size ahead to the hardware buffer. As result of that change I was able to reduce full practically measured record-playback loop delay in those conditions down to only about 115ms with theoretical playback latency of only about 50ms. New code works fine for both vchans and direct cases. In both cases sound(4) tries to follow hw.snd.latency_profile and hw.snd.latency values and application-requested buffer and block sizes as much as limitation of two hardware blocks allows. Reviewed by: silence on multimedia@
146 lines
5.8 KiB
C
146 lines
5.8 KiB
C
/*-
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* Copyright (c) 1999 Cameron Grant <cg@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#define SND_DMA(b) (sndbuf_getflags((b)) & SNDBUF_F_DMA)
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#define SNDBUF_LOCKASSERT(b)
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#define SNDBUF_F_DMA 0x00000001
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#define SNDBUF_F_XRUN 0x00000002
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#define SNDBUF_F_RUNNING 0x00000004
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#define SNDBUF_F_MANAGED 0x00000008
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#define SNDBUF_NAMELEN 48
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struct snd_dbuf {
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device_t dev;
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u_int8_t *buf, *tmpbuf;
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u_int8_t *shadbuf; /**< shadow buffer used w/ S_D_SILENCE/SKIP */
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volatile int sl; /**< shadbuf ready length in # of bytes */
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unsigned int bufsize, maxsize, allocsize;
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volatile int dl; /* transfer size */
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volatile int rp; /* pointers to the ready area */
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volatile int rl; /* length of ready area */
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volatile int hp;
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volatile u_int64_t total, prev_total;
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int dmachan, dir; /* dma channel */
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u_int32_t fmt, spd, bps, align;
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unsigned int blksz, blkcnt;
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int xrun;
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u_int32_t flags;
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bus_dmamap_t dmamap;
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bus_dma_tag_t dmatag;
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bus_addr_t buf_addr;
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int dmaflags;
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struct selinfo sel;
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struct pcm_channel *channel;
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char name[SNDBUF_NAMELEN];
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};
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struct snd_dbuf *sndbuf_create(device_t dev, char *drv, char *desc, struct pcm_channel *channel);
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void sndbuf_destroy(struct snd_dbuf *b);
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void sndbuf_dump(struct snd_dbuf *b, char *s, u_int32_t what);
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int sndbuf_alloc(struct snd_dbuf *b, bus_dma_tag_t dmatag, int dmaflags, unsigned int size);
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int sndbuf_setup(struct snd_dbuf *b, void *buf, unsigned int size);
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void sndbuf_free(struct snd_dbuf *b);
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int sndbuf_resize(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz);
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int sndbuf_remalloc(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz);
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void sndbuf_reset(struct snd_dbuf *b);
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void sndbuf_clear(struct snd_dbuf *b, unsigned int length);
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void sndbuf_fillsilence(struct snd_dbuf *b);
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void sndbuf_fillsilence_rl(struct snd_dbuf *b, u_int rl);
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void sndbuf_softreset(struct snd_dbuf *b);
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void sndbuf_clearshadow(struct snd_dbuf *b);
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u_int32_t sndbuf_getfmt(struct snd_dbuf *b);
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int sndbuf_setfmt(struct snd_dbuf *b, u_int32_t fmt);
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unsigned int sndbuf_getspd(struct snd_dbuf *b);
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void sndbuf_setspd(struct snd_dbuf *b, unsigned int spd);
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unsigned int sndbuf_getbps(struct snd_dbuf *b);
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bus_addr_t sndbuf_getbufaddr(struct snd_dbuf *buf);
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void *sndbuf_getbuf(struct snd_dbuf *b);
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void *sndbuf_getbufofs(struct snd_dbuf *b, unsigned int ofs);
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unsigned int sndbuf_getsize(struct snd_dbuf *b);
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unsigned int sndbuf_getmaxsize(struct snd_dbuf *b);
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unsigned int sndbuf_getallocsize(struct snd_dbuf *b);
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unsigned int sndbuf_getalign(struct snd_dbuf *b);
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unsigned int sndbuf_getblkcnt(struct snd_dbuf *b);
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void sndbuf_setblkcnt(struct snd_dbuf *b, unsigned int blkcnt);
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unsigned int sndbuf_getblksz(struct snd_dbuf *b);
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void sndbuf_setblksz(struct snd_dbuf *b, unsigned int blksz);
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unsigned int sndbuf_runsz(struct snd_dbuf *b);
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void sndbuf_setrun(struct snd_dbuf *b, int go);
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struct selinfo *sndbuf_getsel(struct snd_dbuf *b);
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unsigned int sndbuf_getxrun(struct snd_dbuf *b);
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void sndbuf_setxrun(struct snd_dbuf *b, unsigned int xrun);
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unsigned int sndbuf_gethwptr(struct snd_dbuf *b);
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void sndbuf_sethwptr(struct snd_dbuf *b, unsigned int ptr);
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unsigned int sndbuf_getfree(struct snd_dbuf *b);
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unsigned int sndbuf_getfreeptr(struct snd_dbuf *b);
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unsigned int sndbuf_getready(struct snd_dbuf *b);
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unsigned int sndbuf_getreadyptr(struct snd_dbuf *b);
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u_int64_t sndbuf_getblocks(struct snd_dbuf *b);
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u_int64_t sndbuf_getprevblocks(struct snd_dbuf *b);
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u_int64_t sndbuf_gettotal(struct snd_dbuf *b);
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u_int64_t sndbuf_getprevtotal(struct snd_dbuf *b);
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unsigned int sndbuf_xbytes(unsigned int v, struct snd_dbuf *from, struct snd_dbuf *to);
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u_int8_t sndbuf_zerodata(u_int32_t fmt);
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void sndbuf_updateprevtotal(struct snd_dbuf *b);
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int sndbuf_acquire(struct snd_dbuf *b, u_int8_t *from, unsigned int count);
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int sndbuf_dispose(struct snd_dbuf *b, u_int8_t *to, unsigned int count);
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int sndbuf_feed(struct snd_dbuf *from, struct snd_dbuf *to, struct pcm_channel *channel, struct pcm_feeder *feeder, unsigned int count);
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u_int32_t sndbuf_getflags(struct snd_dbuf *b);
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void sndbuf_setflags(struct snd_dbuf *b, u_int32_t flags, int on);
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int sndbuf_dmasetup(struct snd_dbuf *b, struct resource *drq);
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int sndbuf_dmasetdir(struct snd_dbuf *b, int dir);
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void sndbuf_dma(struct snd_dbuf *b, int go);
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int sndbuf_dmaptr(struct snd_dbuf *b);
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void sndbuf_dmabounce(struct snd_dbuf *b);
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#ifdef OSSV4_EXPERIMENT
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void sndbuf_getpeaks(struct snd_dbuf *b, int *lp, int *rp);
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#endif
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static inline u_int32_t
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snd_xbytes(u_int32_t v, u_int32_t from, u_int32_t to)
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{
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if (from == to)
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return (v);
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if (from == 0)
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return (0);
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return ((u_int64_t)v * to / from);
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}
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