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
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@ -1,4 +1,4 @@
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# $NetBSD: files,v 1.871 2007/11/11 16:58:02 pooka Exp $
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# $NetBSD: files,v 1.872 2007/11/11 17:37:45 jmcneill Exp $
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# @(#)files.newconf 7.5 (Berkeley) 5/10/93
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@ -1549,3 +1549,8 @@ define onewire_bitbang
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include "dev/gpio/files.gpio"
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include "dev/onewire/files.onewire"
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#
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# Pseudo audio device
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#
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include "dev/pad/files.pad"
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@ -1,4 +1,4 @@
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# $NetBSD: majors,v 1.36 2007/11/10 21:45:06 pooka Exp $
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# $NetBSD: majors,v 1.37 2007/11/11 17:37:45 jmcneill Exp $
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#
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# Device majors for Machine-Independent drivers.
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#
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@ -33,3 +33,4 @@ device-major drm char 180 drmbase
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device-major bio char 181 bio
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device-major twa char 187 twa
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device-major cpuctl char 188
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device-major pad char 189 pad
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@ -0,0 +1,4 @@
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# $NetBSD: files.pad,v 1.1 2007/11/11 17:37:45 jmcneill Exp $
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defpseudo pad: audiobus, auconv, aurateconv
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file dev/pad/pad.c pad
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@ -0,0 +1,490 @@
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/* $NetBSD: pad.c,v 1.1 2007/11/11 17:37:45 jmcneill Exp $ */
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/*-
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* Copyright (c) 2007 Jared D. McNeill <jmcneill@invisible.ca>
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Jared D. McNeill.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: pad.c,v 1.1 2007/11/11 17:37:45 jmcneill Exp $");
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/buf.h>
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#include <sys/kmem.h>
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#include <sys/kernel.h>
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#include <sys/device.h>
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#include <sys/proc.h>
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#include <sys/condvar.h>
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#include <sys/select.h>
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#include <sys/audioio.h>
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#include <dev/audio_if.h>
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#include <dev/audiovar.h>
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#include <dev/auconv.h>
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#define PADUNIT(x) minor(x)
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extern struct cfdriver pad_cd;
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static struct audio_device pad_device = {
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"Pseudo Audio",
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"1.0",
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"pad",
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};
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typedef struct pad_block {
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uint8_t *pb_ptr;
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int pb_len;
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} pad_block_t;
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typedef struct pad_softc {
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struct device sc_dev;
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int sc_open;
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struct audio_encoding_set *sc_encodings;
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void (*sc_intr)(void *);
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void *sc_intrarg;
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kcondvar_t sc_condvar;
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kmutex_t sc_mutex;
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struct audio_softc *sc_audiodev;
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int sc_blksize;
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#define PAD_BLKSIZE 1024
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#define PAD_BUFSIZE 65536
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uint8_t sc_audiobuf[PAD_BUFSIZE];
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uint32_t sc_buflen;
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uint32_t sc_rpos, sc_wpos;
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} pad_softc_t;
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static int pad_match(struct device *, struct cfdata *, void *);
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static void pad_attach(struct device *, struct device *, void *);
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static int pad_query_encoding(void *, struct audio_encoding *);
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static int pad_set_params(void *, int, int,
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audio_params_t *, audio_params_t *,
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stream_filter_list_t *, stream_filter_list_t *);
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static int pad_start_output(void *, void *, int,
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void (*)(void *), void *);
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static int pad_start_input(void *, void *, int,
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void (*)(void *), void *);
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static int pad_halt_output(void *);
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static int pad_halt_input(void *);
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static int pad_getdev(void *, struct audio_device *);
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static int pad_set_port(void *, mixer_ctrl_t *);
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static int pad_get_port(void *, mixer_ctrl_t *);
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static int pad_query_devinfo(void *, mixer_devinfo_t *);
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static int pad_get_props(void *);
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static int pad_round_blocksize(void *, int, int, const audio_params_t *);
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static const struct audio_hw_if pad_hw_if = {
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.query_encoding = pad_query_encoding,
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.set_params = pad_set_params,
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.start_output = pad_start_output,
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.start_input = pad_start_input,
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.halt_output = pad_halt_output,
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.halt_input = pad_halt_input,
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.getdev = pad_getdev,
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.set_port = pad_set_port,
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.get_port = pad_get_port,
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.query_devinfo = pad_query_devinfo,
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.get_props = pad_get_props,
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.round_blocksize = pad_round_blocksize,
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};
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#define PAD_NFORMATS 1
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static const struct audio_format pad_formats[PAD_NFORMATS] = {
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{ NULL, AUMODE_PLAY|AUMODE_RECORD, AUDIO_ENCODING_SLINEAR_LE, 16, 16,
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2, AUFMT_STEREO, 1, { 44100 } },
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};
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extern void padattach(int);
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static pad_softc_t * pad_find_softc(dev_t);
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static int pad_add_block(pad_softc_t *, uint8_t *, int);
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static int pad_get_block(pad_softc_t *, pad_block_t *, int);
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dev_type_open(pad_open);
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dev_type_close(pad_close);
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dev_type_read(pad_read);
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const struct cdevsw pad_cdevsw = {
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.d_open = pad_open,
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.d_close = pad_close,
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.d_read = pad_read,
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.d_write = nowrite,
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.d_ioctl = noioctl,
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.d_stop = nostop,
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.d_tty = notty,
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.d_poll = nopoll,
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.d_mmap = nommap,
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.d_kqfilter = nokqfilter,
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.d_flag = D_OTHER,
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};
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CFATTACH_DECL(pad, sizeof(pad_softc_t), pad_match, pad_attach, NULL, NULL);
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void
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padattach(int n)
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{
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int i, err;
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struct cfdata *cf;
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#ifdef DEBUG
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printf("pad: requested %d units\n", n);
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#endif
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err = config_cfattach_attach(pad_cd.cd_name, &pad_ca);
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if (err) {
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aprint_error("%s: couldn't register cfattach: %d\n",
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pad_cd.cd_name, err);
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config_cfdriver_detach(&pad_cd);
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return;
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}
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for (i = 0; i < n; i++) {
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cf = kmem_alloc(sizeof(struct cfdata), KM_NOSLEEP);
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if (cf == NULL) {
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aprint_error("%s: couldn't allocate cfdata\n",
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pad_cd.cd_name);
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continue;
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}
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cf->cf_name = pad_cd.cd_name;
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cf->cf_atname = pad_cd.cd_name;
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cf->cf_unit = i;
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cf->cf_fstate = FSTATE_STAR;
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(void)config_attach_pseudo(cf);
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}
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return;
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}
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static pad_softc_t *
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pad_find_softc(dev_t dev)
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{
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int unit;
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unit = PADUNIT(dev);
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if (unit >= pad_cd.cd_ndevs)
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return NULL;
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return pad_cd.cd_devs[unit];
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}
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static int
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pad_add_block(pad_softc_t *sc, uint8_t *blk, int blksize)
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{
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int l;
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if (sc->sc_buflen + blksize > PAD_BUFSIZE)
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return ENOBUFS;
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if (sc->sc_wpos + blksize <= PAD_BUFSIZE)
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memcpy(sc->sc_audiobuf + sc->sc_wpos, blk, blksize);
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else {
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l = PAD_BUFSIZE - sc->sc_wpos;
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memcpy(sc->sc_audiobuf + sc->sc_wpos, blk, l);
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memcpy(sc->sc_audiobuf, blk + l, blksize - l);
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}
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sc->sc_wpos += blksize;
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if (sc->sc_wpos > PAD_BUFSIZE)
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sc->sc_wpos -= PAD_BUFSIZE;
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sc->sc_buflen += blksize;
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return 0;
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}
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static int
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pad_get_block(pad_softc_t *sc, pad_block_t *pb, int blksize)
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{
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int l;
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KASSERT(pb != NULL);
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if (sc->sc_buflen < blksize)
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return ERESTART;
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pb->pb_ptr = (sc->sc_audiobuf + sc->sc_rpos);
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if (sc->sc_rpos + blksize < PAD_BUFSIZE) {
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pb->pb_len = blksize;
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sc->sc_rpos += blksize;
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} else {
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l = PAD_BUFSIZE - sc->sc_rpos;
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pb->pb_len = l;
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sc->sc_rpos = 0;
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}
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sc->sc_buflen -= pb->pb_len;
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return 0;
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}
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static int
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pad_match(struct device *parent, struct cfdata *data, void *opaque)
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{
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return 1;
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}
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static void
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pad_attach(struct device *parent, struct device *self, void *opaque)
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{
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pad_softc_t *sc;
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sc = (pad_softc_t *)self;
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aprint_normal_dev(self, "Pseudo Audio Device\n");
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aprint_normal_dev(self, "outputs: 44100Hz, 16-bit, stereo\n");
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sc->sc_open = 0;
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if (auconv_create_encodings(pad_formats, PAD_NFORMATS,
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&sc->sc_encodings) != 0) {
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aprint_error_dev(self, "couldn't create encodings\n");
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return;
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}
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cv_init(&sc->sc_condvar, device_xname(self));
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mutex_init(&sc->sc_mutex, MUTEX_DRIVER, IPL_AUDIO);
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sc->sc_buflen = 0;
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sc->sc_rpos = sc->sc_wpos = 0;
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sc->sc_audiodev = (void *)audio_attach_mi(&pad_hw_if, sc, &sc->sc_dev);
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return;
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}
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int
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pad_open(dev_t dev, int flags, int fmt, struct lwp *l)
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{
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pad_softc_t *sc;
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sc = pad_find_softc(dev);
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if (sc == NULL)
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return ENODEV;
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if (sc->sc_open++) {
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sc->sc_open--;
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return EBUSY;
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}
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return 0;
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}
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int
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pad_close(dev_t dev, int flags, int fmt, struct lwp *l)
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{
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pad_softc_t *sc;
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sc = pad_find_softc(dev);
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if (sc == NULL)
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return ENODEV;
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KASSERT(sc->sc_open > 0);
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sc->sc_open--;
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return 0;
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}
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int
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pad_read(dev_t dev, struct uio *uio, int flags)
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{
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pad_softc_t *sc;
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pad_block_t pb;
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void (*intr)(void *);
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void *intrarg;
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int err;
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sc = pad_find_softc(dev);
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if (sc == NULL)
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return ENODEV;
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err = 0;
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intr = sc->sc_intr;
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intrarg = sc->sc_intrarg;
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while (uio->uio_resid > 0 && !err) {
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err = pad_get_block(sc, &pb, min(uio->uio_resid, PAD_BLKSIZE));
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if (!err)
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err = uiomove(pb.pb_ptr, pb.pb_len, uio);
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else {
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if (intr) {
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(*intr)(intrarg);
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intr = sc->sc_intr;
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intrarg = sc->sc_intrarg;
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err = 0;
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continue;
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}
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mutex_enter(&sc->sc_mutex);
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err = cv_timedwait_sig(&sc->sc_condvar, &sc->sc_mutex,
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hz/100);
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if (err != 0 && err != EWOULDBLOCK) {
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mutex_exit(&sc->sc_mutex);
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aprint_error_dev(&sc->sc_dev,
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"cv_timedwait_sig returned %d\n", err);
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return EINTR;
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}
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intr = sc->sc_intr;
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intrarg = sc->sc_intrarg;
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mutex_exit(&sc->sc_mutex);
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err = 0;
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}
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}
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if (intr)
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(*intr)(intrarg);
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return err;
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}
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static int
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pad_query_encoding(void *opaque, struct audio_encoding *ae)
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{
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pad_softc_t *sc;
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sc = (pad_softc_t *)opaque;
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return auconv_query_encoding(sc->sc_encodings, ae);
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}
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static int
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pad_set_params(void *opaque, int setmode, int usemode,
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audio_params_t *play, audio_params_t *rec,
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stream_filter_list_t *pfil, stream_filter_list_t *rfil)
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{
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pad_softc_t *sc;
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sc = (pad_softc_t *)opaque;
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if (auconv_set_converter(pad_formats, PAD_NFORMATS, AUMODE_PLAY,
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play, true, pfil) < 0)
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return EINVAL;
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if (auconv_set_converter(pad_formats, PAD_NFORMATS, AUMODE_RECORD,
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rec, true, rfil) < 0)
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return EINVAL;
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return 0;
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}
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static int
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pad_start_output(void *opaque, void *block, int blksize,
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void (*intr)(void *), void *intrarg)
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{
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pad_softc_t *sc;
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int err;
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sc = (pad_softc_t *)opaque;
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mutex_enter(&sc->sc_mutex);
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sc->sc_intr = intr;
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sc->sc_intrarg = intrarg;
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sc->sc_blksize = blksize;
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err = pad_add_block(sc, block, blksize);
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cv_signal(&sc->sc_condvar);
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mutex_exit(&sc->sc_mutex);
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return err;
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}
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static int
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pad_start_input(void *opaque, void *block, int blksize,
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void (*intr)(void *), void *intrarg)
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{
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return EINVAL;
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}
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static int
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pad_halt_output(void *opaque)
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{
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pad_softc_t *sc;
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sc = (pad_softc_t *)opaque;
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sc->sc_intr = NULL;
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sc->sc_intrarg = NULL;
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sc->sc_buflen = 0;
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sc->sc_rpos = sc->sc_wpos = 0;
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return 0;
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}
|
||||
|
||||
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