90da2b2859
For a slightly thorough explaination, please refer to [1] http://people.freebsd.org/~ariff/SOUND_4.TXT.html . Summary of changes includes: 1 Volume Per-Channel (vpc). Provides private / standalone volume control unique per-stream pcm channel without touching master volume / pcm. Applications can directly use SNDCTL_DSP_[GET|SET][PLAY|REC]VOL, or for backwards compatibility, SOUND_MIXER_PCM through the opened dsp device instead of /dev/mixer. Special "bypass" mode is enabled through /dev/mixer which will automatically detect if the adjustment is made through /dev/mixer and forward its request to this private volume controller. Changes to this volume object will not interfere with other channels. Requirements: - SNDCTL_DSP_[GET|SET][PLAY|REC]_VOL are newer ioctls (OSSv4) which require specific application modifications (preferred). - No modifications required for using bypass mode, so applications like mplayer or xmms should work out of the box. Kernel hints: - hint.pcm.%d.vpc (0 = disable vpc). Kernel sysctls: - hw.snd.vpc_mixer_bypass (default: 1). Enable or disable /dev/mixer bypass mode. - hw.snd.vpc_autoreset (default: 1). By default, closing/opening /dev/dsp will reset the volume back to 0 db gain/attenuation. Setting this to 0 will preserve its settings across device closing/opening. - hw.snd.vpc_reset (default: 0). Panic/reset button to reset all volume settings back to 0 db. - hw.snd.vpc_0db (default: 45). 0 db relative to linear mixer value. 2 High quality fixed-point Bandlimited SINC sampling rate converter, based on Julius O'Smith's Digital Audio Resampling - http://ccrma.stanford.edu/~jos/resample/. It includes a filter design script written in awk (the clumsiest joke I've ever written) - 100% 32bit fixed-point, 64bit accumulator. - Possibly among the fastest (if not fastest) of its kind. - Resampling quality is tunable, either runtime or during kernel compilation (FEEDER_RATE_PRESETS). - Quality can be further customized during kernel compilation by defining FEEDER_RATE_PRESETS in /etc/make.conf. Kernel sysctls: - hw.snd.feeder_rate_quality. 0 - Zero-order Hold (ZOH). Fastest, bad quality. 1 - Linear Interpolation (LINEAR). Slightly slower than ZOH, better quality but still does not eliminate aliasing. 2 - (and above) - Sinc Interpolation(SINC). Best quality. SINC quality always start from 2 and above. Rough quality comparisons: - http://people.freebsd.org/~ariff/z_comparison/ 3 Bit-perfect mode. Bypasses all feeder/dsp effects. Pure sound will be directly fed into the hardware. 4 Parametric (compile time) Software Equalizer (Bass/Treble mixer). Can be customized by defining FEEDER_EQ_PRESETS in /etc/make.conf. 5 Transparent/Adaptive Virtual Channel. Now you don't have to disable vchans in order to make digital format pass through. It also makes vchans more dynamic by choosing a better format/rate among all the concurrent streams, which means that dev.pcm.X.play.vchanformat/rate becomes sort of optional. 6 Exclusive Stream, with special open() mode O_EXCL. This will "mute" other concurrent vchan streams and only allow a single channel with O_EXCL set to keep producing sound. Other Changes: * most feeder_* stuffs are compilable in userland. Let's not speculate whether we should go all out for it (save that for FreeBSD 16.0-RELEASE). * kobj signature fixups, thanks to Andriy Gapon <avg@freebsd.org> * pull out channel mixing logic out of vchan.c and create its own feeder_mixer for world justice. * various refactoring here and there, for good or bad. * activation of few more OSSv4 ioctls() (see [1] above). * opt_snd.h for possible compile time configuration: (mostly for debugging purposes, don't try these at home) SND_DEBUG SND_DIAGNOSTIC SND_FEEDER_MULTIFORMAT SND_FEEDER_FULL_MULTIFORMAT SND_FEEDER_RATE_HP SND_PCM_64 SND_OLDSTEREO Manual page updates are on the way. Tested by: joel, Olivier SMEDTS <olivier at gid0 d org>, too many unsung / unnamed heroes.
135 lines
5.6 KiB
C
135 lines
5.6 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_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 snd_xbytes(unsigned int v, unsigned int from, unsigned int to);
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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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