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.
137 lines
4.3 KiB
C
137 lines
4.3 KiB
C
/*-
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* Copyright (c) 2008-2009 Ariff Abdullah <ariff@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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#ifndef _SND_INTPCM_H_
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#define _SND_INTPCM_H_
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typedef intpcm_t intpcm_read_t(uint8_t *);
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typedef void intpcm_write_t(uint8_t *, intpcm_t);
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extern intpcm_read_t *feeder_format_read_op(uint32_t);
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extern intpcm_write_t *feeder_format_write_op(uint32_t);
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#define INTPCM_DECLARE_OP_WRITE(SIGN, BIT, ENDIAN, SHIFT) \
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static __inline void \
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intpcm_write_##SIGN##BIT##ENDIAN(uint8_t *dst, intpcm_t v) \
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{ \
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\
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_PCM_WRITE_##SIGN##BIT##_##ENDIAN(dst, v >> SHIFT); \
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}
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#define INTPCM_DECLARE_OP_8(SIGN, ENDIAN) \
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static __inline intpcm_t \
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intpcm_read_##SIGN##8##ENDIAN(uint8_t *src) \
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{ \
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\
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return (_PCM_READ_##SIGN##8##_##ENDIAN(src) << 24); \
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} \
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INTPCM_DECLARE_OP_WRITE(SIGN, 8, ENDIAN, 24)
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#define INTPCM_DECLARE_OP_16(SIGN, ENDIAN) \
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static __inline intpcm_t \
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intpcm_read_##SIGN##16##ENDIAN(uint8_t *src) \
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{ \
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\
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return (_PCM_READ_##SIGN##16##_##ENDIAN(src) << 16); \
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} \
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INTPCM_DECLARE_OP_WRITE(SIGN, 16, ENDIAN, 16)
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#define INTPCM_DECLARE_OP_24(SIGN, ENDIAN) \
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static __inline intpcm_t \
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intpcm_read_##SIGN##24##ENDIAN(uint8_t *src) \
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{ \
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\
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return (_PCM_READ_##SIGN##24##_##ENDIAN(src) << 8); \
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} \
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INTPCM_DECLARE_OP_WRITE(SIGN, 24, ENDIAN, 8)
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#define INTPCM_DECLARE_OP_32(SIGN, ENDIAN) \
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static __inline intpcm_t \
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intpcm_read_##SIGN##32##ENDIAN(uint8_t *src) \
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{ \
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\
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return (_PCM_READ_##SIGN##32##_##ENDIAN(src)); \
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} \
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\
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static __inline void \
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intpcm_write_##SIGN##32##ENDIAN(uint8_t *dst, intpcm_t v) \
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{ \
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\
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_PCM_WRITE_##SIGN##32##_##ENDIAN(dst, v); \
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}
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#define INTPCM_DECLARE(t) \
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\
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G711_DECLARE_TABLE(t); \
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\
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static __inline intpcm_t \
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intpcm_read_ulaw(uint8_t *src) \
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{ \
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\
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return (_G711_TO_INTPCM((t).ulaw_to_u8, *src) << 24); \
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} \
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\
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static __inline intpcm_t \
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intpcm_read_alaw(uint8_t *src) \
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{ \
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\
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return (_G711_TO_INTPCM((t).alaw_to_u8, *src) << 24); \
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} \
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\
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static __inline void \
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intpcm_write_ulaw(uint8_t *dst, intpcm_t v) \
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{ \
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\
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*dst = _INTPCM_TO_G711((t).u8_to_ulaw, v >> 24); \
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} \
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\
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static __inline void \
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intpcm_write_alaw(uint8_t *dst, intpcm_t v) \
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{ \
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\
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*dst = _INTPCM_TO_G711((t).u8_to_alaw, v >> 24); \
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} \
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\
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INTPCM_DECLARE_OP_8(S, NE) \
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INTPCM_DECLARE_OP_16(S, LE) \
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INTPCM_DECLARE_OP_16(S, BE) \
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INTPCM_DECLARE_OP_24(S, LE) \
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INTPCM_DECLARE_OP_24(S, BE) \
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INTPCM_DECLARE_OP_32(S, LE) \
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INTPCM_DECLARE_OP_32(S, BE) \
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INTPCM_DECLARE_OP_8(U, NE) \
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INTPCM_DECLARE_OP_16(U, LE) \
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INTPCM_DECLARE_OP_16(U, BE) \
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INTPCM_DECLARE_OP_24(U, LE) \
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INTPCM_DECLARE_OP_24(U, BE) \
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INTPCM_DECLARE_OP_32(U, LE) \
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INTPCM_DECLARE_OP_32(U, BE)
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#endif /* !_SND_INTPCM_H_ */
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