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authorjmcneill <jmcneill@NetBSD.org>2007-11-11 17:37:45 +0000
committerjmcneill <jmcneill@NetBSD.org>2007-11-11 17:37:45 +0000
commit23526fe3a918afc191131e439f8fe77d84cde7cc (patch)
tree98cfb6bb252e9931d0492a7110cf18a620b0afef /sys/dev
parent66a59dcc4f9dde95cd39624cde550ee7022b2b6e (diff)
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
Diffstat (limited to 'sys/dev')
-rw-r--r--sys/dev/pad/files.pad4
-rw-r--r--sys/dev/pad/pad.c490
2 files changed, 494 insertions, 0 deletions
diff --git a/sys/dev/pad/files.pad b/sys/dev/pad/files.pad
new file mode 100644
index 00000000000..0b299ceb139
--- /dev/null
+++ b/sys/dev/pad/files.pad
@@ -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
diff --git a/sys/dev/pad/pad.c b/sys/dev/pad/pad.c
new file mode 100644
index 00000000000..14985b8db93
--- /dev/null
+++ b/sys/dev/pad/pad.c
@@ -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;
+}