e3faadaafe
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.
234 lines
5.4 KiB
Objective-C
234 lines
5.4 KiB
Objective-C
#-
|
|
# KOBJ
|
|
#
|
|
# Copyright (c) 2005-2009 Ariff Abdullah <ariff@FreeBSD.org>
|
|
# Portions Copyright (c) Ryan Beasley <ryan.beasley@gmail.com> - GSoC 2006
|
|
# Copyright (c) 2000 Cameron Grant <cg@FreeBSD.org>
|
|
# All rights reserved.
|
|
#
|
|
# Redistribution and use in source and binary forms, with or without
|
|
# modification, are permitted provided that the following conditions
|
|
# are met:
|
|
# 1. Redistributions of source code must retain the above copyright
|
|
# notice, this list of conditions and the following disclaimer.
|
|
# 2. Redistributions in binary form must reproduce the above copyright
|
|
# notice, this list of conditions and the following disclaimer in the
|
|
# documentation and/or other materials provided with the distribution.
|
|
#
|
|
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
# SUCH DAMAGE.
|
|
#
|
|
# $FreeBSD$
|
|
#
|
|
|
|
#include <dev/sound/pcm/sound.h>
|
|
|
|
INTERFACE channel;
|
|
|
|
CODE {
|
|
|
|
static int
|
|
channel_noreset(kobj_t obj, void *data)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
channel_noresetdone(kobj_t obj, void *data)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
channel_nofree(kobj_t obj, void *data)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static u_int32_t
|
|
channel_nogetptr(kobj_t obj, void *data)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
channel_nonotify(kobj_t obj, void *data, u_int32_t changed)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
channel_nogetpeaks(kobj_t obj, void *data, int *lpeak, int *rpeak)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
channel_nogetrates(kobj_t obj, void *data, int **rates)
|
|
{
|
|
*rates = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
channel_nosetfragments(kobj_t obj, void *data, u_int32_t blocksize, u_int32_t blockcount)
|
|
{
|
|
return ENOTSUP;
|
|
}
|
|
|
|
static struct pcmchan_matrix *
|
|
channel_nogetmatrix(kobj_t obj, void *data, u_int32_t format)
|
|
{
|
|
format = feeder_matrix_default_format(format);
|
|
return (feeder_matrix_format_map(format));
|
|
}
|
|
|
|
static int
|
|
channel_nosetmatrix(kobj_t obj, void *data, struct pcmchan_matrix *m)
|
|
{
|
|
return ENOTSUP;
|
|
}
|
|
};
|
|
|
|
METHOD void* init {
|
|
kobj_t obj;
|
|
void *devinfo;
|
|
struct snd_dbuf *b;
|
|
struct pcm_channel *c;
|
|
int dir;
|
|
};
|
|
|
|
METHOD int free {
|
|
kobj_t obj;
|
|
void *data;
|
|
} DEFAULT channel_nofree;
|
|
|
|
METHOD int reset {
|
|
kobj_t obj;
|
|
void *data;
|
|
} DEFAULT channel_noreset;
|
|
|
|
METHOD int resetdone {
|
|
kobj_t obj;
|
|
void *data;
|
|
} DEFAULT channel_noresetdone;
|
|
|
|
METHOD int setformat {
|
|
kobj_t obj;
|
|
void *data;
|
|
u_int32_t format;
|
|
};
|
|
|
|
METHOD u_int32_t setspeed {
|
|
kobj_t obj;
|
|
void *data;
|
|
u_int32_t speed;
|
|
};
|
|
|
|
METHOD u_int32_t setblocksize {
|
|
kobj_t obj;
|
|
void *data;
|
|
u_int32_t blocksize;
|
|
};
|
|
|
|
METHOD int setfragments {
|
|
kobj_t obj;
|
|
void *data;
|
|
u_int32_t blocksize;
|
|
u_int32_t blockcount;
|
|
} DEFAULT channel_nosetfragments;
|
|
|
|
METHOD int trigger {
|
|
kobj_t obj;
|
|
void *data;
|
|
int go;
|
|
};
|
|
|
|
METHOD u_int32_t getptr {
|
|
kobj_t obj;
|
|
void *data;
|
|
} DEFAULT channel_nogetptr;
|
|
|
|
METHOD struct pcmchan_caps* getcaps {
|
|
kobj_t obj;
|
|
void *data;
|
|
};
|
|
|
|
METHOD int notify {
|
|
kobj_t obj;
|
|
void *data;
|
|
u_int32_t changed;
|
|
} DEFAULT channel_nonotify;
|
|
|
|
/**
|
|
* @brief Retrieve channel peak values
|
|
*
|
|
* This function is intended to obtain peak volume values for samples
|
|
* played/recorded on a channel. Values are on a linear scale from 0 to
|
|
* 32767. If the channel is monaural, a single value should be recorded
|
|
* in @c lpeak.
|
|
*
|
|
* If hardware support isn't available, the SNDCTL_DSP_GET[IO]PEAKS
|
|
* operation should return EINVAL. However, we may opt to provide
|
|
* software support that the user may toggle via sysctl/mixext.
|
|
*
|
|
* @param obj standard kobj object (usually @c channel->methods)
|
|
* @param data driver-specific data (usually @c channel->devinfo)
|
|
* @param lpeak pointer to store left peak level
|
|
* @param rpeak pointer to store right peak level
|
|
*
|
|
* @retval -1 Error; usually operation isn't supported.
|
|
* @retval 0 success
|
|
*/
|
|
METHOD int getpeaks {
|
|
kobj_t obj;
|
|
void *data;
|
|
int *lpeak;
|
|
int *rpeak;
|
|
} DEFAULT channel_nogetpeaks;
|
|
|
|
/**
|
|
* @brief Retrieve discrete supported sample rates
|
|
*
|
|
* Some cards operate at fixed rates, and this call is intended to retrieve
|
|
* those rates primarily for when in-kernel rate adjustment is undesirable
|
|
* (e.g., application wants direct DMA access after setting a channel to run
|
|
* "uncooked").
|
|
*
|
|
* The parameter @c rates is a double pointer which will be reset to
|
|
* point to an array of supported sample rates. The number of elements
|
|
* in the array is returned to the caller.
|
|
*
|
|
* @param obj standard kobj object (usually @c channel->methods)
|
|
* @param data driver-specific data (usually @c channel->devinfo)
|
|
* @param rates rate array pointer
|
|
*
|
|
* @return Number of rates in the array
|
|
*/
|
|
METHOD int getrates {
|
|
kobj_t obj;
|
|
void *data;
|
|
int **rates;
|
|
} DEFAULT channel_nogetrates;
|
|
|
|
METHOD struct pcmchan_matrix * getmatrix {
|
|
kobj_t obj;
|
|
void *data;
|
|
u_int32_t format;
|
|
} DEFAULT channel_nogetmatrix;
|
|
|
|
METHOD int setmatrix {
|
|
kobj_t obj;
|
|
void *data;
|
|
struct pcmchan_matrix *m;
|
|
} DEFAULT channel_nosetmatrix;
|