Add pseudo audio device driver. With this pseudo-device, audio played back
via the standard audio interfaces is redirected back to userland as raw PCM data on /dev/padN. One example usage is to stream audio to an AirTunes compatible device using rtunes (http://www.nazgul.ch/dev_rtunes.html), ie: $ rtunes - < /dev/pad0 $ mpg123 -a /dev/sound1 blah.mp3 Another option is to capture audio output from eg. Real Player, by simply instructing Real Player to output to /dev/sound1, and running: $ cat /dev/pad0 > blah.pcm
This commit is contained in:
jmcneill
parent
66a59dcc4f
commit
23526fe3a9
@ -1,4 +1,4 @@
|
||||
# $NetBSD: files,v 1.871 2007/11/11 16:58:02 pooka Exp $
|
||||
# $NetBSD: files,v 1.872 2007/11/11 17:37:45 jmcneill Exp $
|
||||
|
||||
# @(#)files.newconf 7.5 (Berkeley) 5/10/93
|
||||
|
||||
@ -1549,3 +1549,8 @@ define onewire_bitbang
|
||||
include "dev/gpio/files.gpio"
|
||||
|
||||
include "dev/onewire/files.onewire"
|
||||
|
||||
#
|
||||
# Pseudo audio device
|
||||
#
|
||||
include "dev/pad/files.pad"
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
# $NetBSD: majors,v 1.36 2007/11/10 21:45:06 pooka Exp $
|
||||
# $NetBSD: majors,v 1.37 2007/11/11 17:37:45 jmcneill Exp $
|
||||
#
|
||||
# Device majors for Machine-Independent drivers.
|
||||
#
|
||||
@ -33,3 +33,4 @@ device-major drm char 180 drmbase
|
||||
device-major bio char 181 bio
|
||||
device-major twa char 187 twa
|
||||
device-major cpuctl char 188
|
||||
device-major pad char 189 pad
|
||||
|
||||
4
sys/dev/pad/files.pad
Normal file
4
sys/dev/pad/files.pad
Normal file
@ -0,0 +1,4 @@
|
||||
# $NetBSD: files.pad,v 1.1 2007/11/11 17:37:45 jmcneill Exp $
|
||||
|
||||
defpseudo pad: audiobus, auconv, aurateconv
|
||||
file dev/pad/pad.c pad
|
||||
490
sys/dev/pad/pad.c
Normal file
490
sys/dev/pad/pad.c
Normal file
@ -0,0 +1,490 @@
|
||||
/* $NetBSD: pad.c,v 1.1 2007/11/11 17:37:45 jmcneill Exp $ */
|
||||
|
||||
/*-
|
||||
* Copyright (c) 2007 Jared D. McNeill <jmcneill@invisible.ca>
|
||||
* 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.
|
||||
* 3. All advertising materials mentioning features or use of this software
|
||||
* must display the following acknowledgement:
|
||||
* This product includes software developed by Jared D. McNeill.
|
||||
* 4. Neither the name of The NetBSD Foundation nor the names of its
|
||||
* contributors may be used to endorse or promote products derived
|
||||
* from this software without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
|
||||
*/
|
||||
|
||||
#include <sys/cdefs.h>
|
||||
__KERNEL_RCSID(0, "$NetBSD: pad.c,v 1.1 2007/11/11 17:37:45 jmcneill Exp $");
|
||||
|
||||
#include <sys/types.h>
|
||||
#include <sys/param.h>
|
||||
#include <sys/conf.h>
|
||||
#include <sys/buf.h>
|
||||
#include <sys/kmem.h>
|
||||
#include <sys/kernel.h>
|
||||
#include <sys/device.h>
|
||||
#include <sys/proc.h>
|
||||
#include <sys/condvar.h>
|
||||
#include <sys/select.h>
|
||||
#include <sys/audioio.h>
|
||||
|
||||
#include <dev/audio_if.h>
|
||||
#include <dev/audiovar.h>
|
||||
#include <dev/auconv.h>
|
||||
|
||||
#define PADUNIT(x) minor(x)
|
||||
|
||||
extern struct cfdriver pad_cd;
|
||||
|
||||
static struct audio_device pad_device = {
|
||||
"Pseudo Audio",
|
||||
"1.0",
|
||||
"pad",
|
||||
};
|
||||
|
||||
typedef struct pad_block {
|
||||
uint8_t *pb_ptr;
|
||||
int pb_len;
|
||||
} pad_block_t;
|
||||
|
||||
typedef struct pad_softc {
|
||||
struct device sc_dev;
|
||||
|
||||
int sc_open;
|
||||
struct audio_encoding_set *sc_encodings;
|
||||
void (*sc_intr)(void *);
|
||||
void *sc_intrarg;
|
||||
|
||||
kcondvar_t sc_condvar;
|
||||
kmutex_t sc_mutex;
|
||||
|
||||
struct audio_softc *sc_audiodev;
|
||||
int sc_blksize;
|
||||
|
||||
#define PAD_BLKSIZE 1024
|
||||
#define PAD_BUFSIZE 65536
|
||||
uint8_t sc_audiobuf[PAD_BUFSIZE];
|
||||
uint32_t sc_buflen;
|
||||
uint32_t sc_rpos, sc_wpos;
|
||||
} pad_softc_t;
|
||||
|
||||
static int pad_match(struct device *, struct cfdata *, void *);
|
||||
static void pad_attach(struct device *, struct device *, void *);
|
||||
|
||||
static int pad_query_encoding(void *, struct audio_encoding *);
|
||||
static int pad_set_params(void *, int, int,
|
||||
audio_params_t *, audio_params_t *,
|
||||
stream_filter_list_t *, stream_filter_list_t *);
|
||||
static int pad_start_output(void *, void *, int,
|
||||
void (*)(void *), void *);
|
||||
static int pad_start_input(void *, void *, int,
|
||||
void (*)(void *), void *);
|
||||
static int pad_halt_output(void *);
|
||||
static int pad_halt_input(void *);
|
||||
static int pad_getdev(void *, struct audio_device *);
|
||||
static int pad_set_port(void *, mixer_ctrl_t *);
|
||||
static int pad_get_port(void *, mixer_ctrl_t *);
|
||||
static int pad_query_devinfo(void *, mixer_devinfo_t *);
|
||||
static int pad_get_props(void *);
|
||||
static int pad_round_blocksize(void *, int, int, const audio_params_t *);
|
||||
|
||||
static const struct audio_hw_if pad_hw_if = {
|
||||
.query_encoding = pad_query_encoding,
|
||||
.set_params = pad_set_params,
|
||||
.start_output = pad_start_output,
|
||||
.start_input = pad_start_input,
|
||||
.halt_output = pad_halt_output,
|
||||
.halt_input = pad_halt_input,
|
||||
.getdev = pad_getdev,
|
||||
.set_port = pad_set_port,
|
||||
.get_port = pad_get_port,
|
||||
.query_devinfo = pad_query_devinfo,
|
||||
.get_props = pad_get_props,
|
||||
.round_blocksize = pad_round_blocksize,
|
||||
};
|
||||
|
||||
#define PAD_NFORMATS 1
|
||||
static const struct audio_format pad_formats[PAD_NFORMATS] = {
|
||||
{ NULL, AUMODE_PLAY|AUMODE_RECORD, AUDIO_ENCODING_SLINEAR_LE, 16, 16,
|
||||
2, AUFMT_STEREO, 1, { 44100 } },
|
||||
};
|
||||
|
||||
extern void padattach(int);
|
||||
|
||||
static pad_softc_t * pad_find_softc(dev_t);
|
||||
static int pad_add_block(pad_softc_t *, uint8_t *, int);
|
||||
static int pad_get_block(pad_softc_t *, pad_block_t *, int);
|
||||
|
||||
dev_type_open(pad_open);
|
||||
dev_type_close(pad_close);
|
||||
dev_type_read(pad_read);
|
||||
|
||||
const struct cdevsw pad_cdevsw = {
|
||||
.d_open = pad_open,
|
||||
.d_close = pad_close,
|
||||
.d_read = pad_read,
|
||||
.d_write = nowrite,
|
||||
.d_ioctl = noioctl,
|
||||
.d_stop = nostop,
|
||||
.d_tty = notty,
|
||||
.d_poll = nopoll,
|
||||
.d_mmap = nommap,
|
||||
.d_kqfilter = nokqfilter,
|
||||
.d_flag = D_OTHER,
|
||||
};
|
||||
|
||||
CFATTACH_DECL(pad, sizeof(pad_softc_t), pad_match, pad_attach, NULL, NULL);
|
||||
|
||||
void
|
||||
padattach(int n)
|
||||
{
|
||||
int i, err;
|
||||
struct cfdata *cf;
|
||||
|
||||
#ifdef DEBUG
|
||||
printf("pad: requested %d units\n", n);
|
||||
#endif
|
||||
|
||||
err = config_cfattach_attach(pad_cd.cd_name, &pad_ca);
|
||||
if (err) {
|
||||
aprint_error("%s: couldn't register cfattach: %d\n",
|
||||
pad_cd.cd_name, err);
|
||||
config_cfdriver_detach(&pad_cd);
|
||||
return;
|
||||
}
|
||||
|
||||
for (i = 0; i < n; i++) {
|
||||
cf = kmem_alloc(sizeof(struct cfdata), KM_NOSLEEP);
|
||||
if (cf == NULL) {
|
||||
aprint_error("%s: couldn't allocate cfdata\n",
|
||||
pad_cd.cd_name);
|
||||
continue;
|
||||
}
|
||||
cf->cf_name = pad_cd.cd_name;
|
||||
cf->cf_atname = pad_cd.cd_name;
|
||||
cf->cf_unit = i;
|
||||
cf->cf_fstate = FSTATE_STAR;
|
||||
|
||||
(void)config_attach_pseudo(cf);
|
||||
}
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
static pad_softc_t *
|
||||
pad_find_softc(dev_t dev)
|
||||
{
|
||||
int unit;
|
||||
|
||||
unit = PADUNIT(dev);
|
||||
if (unit >= pad_cd.cd_ndevs)
|
||||
return NULL;
|
||||
|
||||
return pad_cd.cd_devs[unit];
|
||||
}
|
||||
|
||||
static int
|
||||
pad_add_block(pad_softc_t *sc, uint8_t *blk, int blksize)
|
||||
{
|
||||
int l;
|
||||
|
||||
if (sc->sc_buflen + blksize > PAD_BUFSIZE)
|
||||
return ENOBUFS;
|
||||
|
||||
if (sc->sc_wpos + blksize <= PAD_BUFSIZE)
|
||||
memcpy(sc->sc_audiobuf + sc->sc_wpos, blk, blksize);
|
||||
else {
|
||||
l = PAD_BUFSIZE - sc->sc_wpos;
|
||||
memcpy(sc->sc_audiobuf + sc->sc_wpos, blk, l);
|
||||
memcpy(sc->sc_audiobuf, blk + l, blksize - l);
|
||||
}
|
||||
|
||||
sc->sc_wpos += blksize;
|
||||
if (sc->sc_wpos > PAD_BUFSIZE)
|
||||
sc->sc_wpos -= PAD_BUFSIZE;
|
||||
|
||||
sc->sc_buflen += blksize;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
pad_get_block(pad_softc_t *sc, pad_block_t *pb, int blksize)
|
||||
{
|
||||
int l;
|
||||
|
||||
KASSERT(pb != NULL);
|
||||
|
||||
if (sc->sc_buflen < blksize)
|
||||
return ERESTART;
|
||||
|
||||
pb->pb_ptr = (sc->sc_audiobuf + sc->sc_rpos);
|
||||
if (sc->sc_rpos + blksize < PAD_BUFSIZE) {
|
||||
pb->pb_len = blksize;
|
||||
sc->sc_rpos += blksize;
|
||||
} else {
|
||||
l = PAD_BUFSIZE - sc->sc_rpos;
|
||||
pb->pb_len = l;
|
||||
sc->sc_rpos = 0;
|
||||
}
|
||||
sc->sc_buflen -= pb->pb_len;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
pad_match(struct device *parent, struct cfdata *data, void *opaque)
|
||||
{
|
||||
return 1;
|
||||
}
|
||||
|
||||
static void
|
||||
pad_attach(struct device *parent, struct device *self, void *opaque)
|
||||
{
|
||||
pad_softc_t *sc;
|
||||
|
||||
sc = (pad_softc_t *)self;
|
||||
|
||||
aprint_normal_dev(self, "Pseudo Audio Device\n");
|
||||
aprint_normal_dev(self, "outputs: 44100Hz, 16-bit, stereo\n");
|
||||
|
||||
sc->sc_open = 0;
|
||||
if (auconv_create_encodings(pad_formats, PAD_NFORMATS,
|
||||
&sc->sc_encodings) != 0) {
|
||||
aprint_error_dev(self, "couldn't create encodings\n");
|
||||
return;
|
||||
}
|
||||
|
||||
cv_init(&sc->sc_condvar, device_xname(self));
|
||||
mutex_init(&sc->sc_mutex, MUTEX_DRIVER, IPL_AUDIO);
|
||||
|
||||
sc->sc_buflen = 0;
|
||||
sc->sc_rpos = sc->sc_wpos = 0;
|
||||
sc->sc_audiodev = (void *)audio_attach_mi(&pad_hw_if, sc, &sc->sc_dev);
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
int
|
||||
pad_open(dev_t dev, int flags, int fmt, struct lwp *l)
|
||||
{
|
||||
pad_softc_t *sc;
|
||||
|
||||
sc = pad_find_softc(dev);
|
||||
if (sc == NULL)
|
||||
return ENODEV;
|
||||
|
||||
if (sc->sc_open++) {
|
||||
sc->sc_open--;
|
||||
return EBUSY;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int
|
||||
pad_close(dev_t dev, int flags, int fmt, struct lwp *l)
|
||||
{
|
||||
pad_softc_t *sc;
|
||||
|
||||
sc = pad_find_softc(dev);
|
||||
if (sc == NULL)
|
||||
return ENODEV;
|
||||
|
||||
KASSERT(sc->sc_open > 0);
|
||||
sc->sc_open--;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int
|
||||
pad_read(dev_t dev, struct uio *uio, int flags)
|
||||
{
|
||||
pad_softc_t *sc;
|
||||
pad_block_t pb;
|
||||
void (*intr)(void *);
|
||||
void *intrarg;
|
||||
int err;
|
||||
|
||||
sc = pad_find_softc(dev);
|
||||
if (sc == NULL)
|
||||
return ENODEV;
|
||||
|
||||
err = 0;
|
||||
|
||||
intr = sc->sc_intr;
|
||||
intrarg = sc->sc_intrarg;
|
||||
|
||||
while (uio->uio_resid > 0 && !err) {
|
||||
err = pad_get_block(sc, &pb, min(uio->uio_resid, PAD_BLKSIZE));
|
||||
if (!err)
|
||||
err = uiomove(pb.pb_ptr, pb.pb_len, uio);
|
||||
else {
|
||||
if (intr) {
|
||||
(*intr)(intrarg);
|
||||
intr = sc->sc_intr;
|
||||
intrarg = sc->sc_intrarg;
|
||||
err = 0;
|
||||
continue;
|
||||
}
|
||||
|
||||
mutex_enter(&sc->sc_mutex);
|
||||
err = cv_timedwait_sig(&sc->sc_condvar, &sc->sc_mutex,
|
||||
hz/100);
|
||||
if (err != 0 && err != EWOULDBLOCK) {
|
||||
mutex_exit(&sc->sc_mutex);
|
||||
aprint_error_dev(&sc->sc_dev,
|
||||
"cv_timedwait_sig returned %d\n", err);
|
||||
return EINTR;
|
||||
}
|
||||
intr = sc->sc_intr;
|
||||
intrarg = sc->sc_intrarg;
|
||||
mutex_exit(&sc->sc_mutex);
|
||||
err = 0;
|
||||
}
|
||||
}
|
||||
|
||||
if (intr)
|
||||
(*intr)(intrarg);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static int
|
||||
pad_query_encoding(void *opaque, struct audio_encoding *ae)
|
||||
{
|
||||
pad_softc_t *sc;
|
||||
|
||||
sc = (pad_softc_t *)opaque;
|
||||
|
||||
return auconv_query_encoding(sc->sc_encodings, ae);
|
||||
}
|
||||
|
||||
static int
|
||||
pad_set_params(void *opaque, int setmode, int usemode,
|
||||
audio_params_t *play, audio_params_t *rec,
|
||||
stream_filter_list_t *pfil, stream_filter_list_t *rfil)
|
||||
{
|
||||
pad_softc_t *sc;
|
||||
|
||||
sc = (pad_softc_t *)opaque;
|
||||
|
||||
if (auconv_set_converter(pad_formats, PAD_NFORMATS, AUMODE_PLAY,
|
||||
play, true, pfil) < 0)
|
||||
return EINVAL;
|
||||
if (auconv_set_converter(pad_formats, PAD_NFORMATS, AUMODE_RECORD,
|
||||
rec, true, rfil) < 0)
|
||||
return EINVAL;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
pad_start_output(void *opaque, void *block, int blksize,
|
||||
void (*intr)(void *), void *intrarg)
|
||||
{
|
||||
pad_softc_t *sc;
|
||||
int err;
|
||||
|
||||
sc = (pad_softc_t *)opaque;
|
||||
|
||||
mutex_enter(&sc->sc_mutex);
|
||||
|
||||
sc->sc_intr = intr;
|
||||
sc->sc_intrarg = intrarg;
|
||||
sc->sc_blksize = blksize;
|
||||
|
||||
err = pad_add_block(sc, block, blksize);
|
||||
|
||||
cv_signal(&sc->sc_condvar);
|
||||
|
||||
mutex_exit(&sc->sc_mutex);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static int
|
||||
pad_start_input(void *opaque, void *block, int blksize,
|
||||
void (*intr)(void *), void *intrarg)
|
||||
{
|
||||
return EINVAL;
|
||||
}
|
||||
|
||||
static int
|
||||
pad_halt_output(void *opaque)
|
||||
{
|
||||
pad_softc_t *sc;
|
||||
|
||||
sc = (pad_softc_t *)opaque;
|
||||
sc->sc_intr = NULL;
|
||||
sc->sc_intrarg = NULL;
|
||||
sc->sc_buflen = 0;
|
||||
sc->sc_rpos = sc->sc_wpos = 0;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
pad_halt_input(void *opaque)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
pad_getdev(void *opaque, struct audio_device *ret)
|
||||
{
|
||||
|
||||
*ret = pad_device;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
pad_set_port(void *opaque, mixer_ctrl_t *mc)
|
||||
{
|
||||
return ENXIO;
|
||||
}
|
||||
|
||||
static int
|
||||
pad_get_port(void *opaque, mixer_ctrl_t *mc)
|
||||
{
|
||||
return ENXIO;
|
||||
}
|
||||
|
||||
static int
|
||||
pad_query_devinfo(void *opaque, mixer_devinfo_t *di)
|
||||
{
|
||||
return ENXIO;
|
||||
}
|
||||
|
||||
static int
|
||||
pad_get_props(void *opaque)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
pad_round_blocksize(void *opaque, int blksize, int mode,
|
||||
const audio_params_t *p)
|
||||
{
|
||||
return PAD_BLKSIZE;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user