Add OSS mixer <-> ALSA control plugin

Added the external OSS mixer <-> ALSA control plugin.

5 files changed, 467 insertions, 3 deletions

diff --git a/Makefile.am b/Makefile.am
index 7784abf..e72ac58 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,4 +1,4 @@
-SUBDIRS = pcm
+SUBDIRS = pcm ctl
 EXTRA_DIST = cvscompile version
 AUTOMAKE_OPTIONS = foreign
 
diff --git a/configure.in b/configure.in
index 39d1cd7..cb24ce1 100644
--- a/configure.in
+++ b/configure.in
@@ -21,6 +21,6 @@ AC_OUTPUT([
 	pcm/Makefile
 	pcm/oss/Makefile
 	pcm/jack/Makefile
+	ctl/Makefile
+	ctl/oss/Makefile
 ])
-
-
diff --git a/ctl/Makefile.am b/ctl/Makefile.am
new file mode 100644
index 0000000..8c1ac17
--- /dev/null
+++ b/ctl/Makefile.am
@@ -0,0 +1,2 @@
+SUBDIRS = oss
+
diff --git a/ctl/oss/Makefile.am b/ctl/oss/Makefile.am
new file mode 100644
index 0000000..f1c0e04
--- /dev/null
+++ b/ctl/oss/Makefile.am
@@ -0,0 +1,10 @@
+asound_module_ctl_oss_LTLIBRARIES = libasound_module_ctl_oss.la
+
+asound_module_ctl_ossdir = $(libdir)/alsa-lib
+
+AM_CFLAGS = -Wall -g @ALSA_CFLAGS@
+libasound_module_ctl_oss_la_SOURCES = ctl_oss.c
+libasound_module_ctl_oss_la_LDFLAGS = -module -avoid-version -export-dynamic
+libasound_module_ctl_oss_la_LIBADD = @ALSA_LIBS@
+
+EXTRA_DIST = README
diff --git a/ctl/oss/ctl_oss.c b/ctl/oss/ctl_oss.c
new file mode 100644
index 0000000..a7cfa8f
--- /dev/null
+++ b/ctl/oss/ctl_oss.c
@@ -0,0 +1,452 @@
+/*
+ * ALSA <-> OSS mixer control plugin
+ *
+ * Copyright (c) 2005 by Takashi Iwai <tiwai@suse.de>
+ *
+ * This library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+/*
+ * TODO: implement the pseudo poll with thread (and pipe as pollfd)?
+ */
+
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <alsa/asoundlib.h>
+#include <alsa/control_external.h>
+#include <linux/soundcard.h>
+
+typedef struct snd_ctl_oss {
+	snd_ctl_ext_t ext;
+	char *device;
+	int fd;
+	int exclusive_input;
+	int stereo_mask;
+	int num_vol_ctls;
+	int vol_ctl[SOUND_MIXER_NRDEVICES];
+	int num_rec_items;
+	int rec_item[SOUND_MIXER_NRDEVICES];
+} snd_ctl_oss_t;
+
+static const char *vol_devices[SOUND_MIXER_NRDEVICES] = {
+	[SOUND_MIXER_VOLUME] =	"Master Playback Volume",
+	[SOUND_MIXER_BASS] =	"Tone Control - Bass",
+	[SOUND_MIXER_TREBLE] =	"Tone Control - Treble",
+	[SOUND_MIXER_SYNTH] =	"Synth Playback Volume",
+	[SOUND_MIXER_PCM] =	"PCM Playback Volume",
+	[SOUND_MIXER_SPEAKER] =	"PC Speaker Playback Volume",
+	[SOUND_MIXER_LINE] =	"Line Playback Volume",
+	[SOUND_MIXER_MIC] =	"Mic Playback Volume",
+	[SOUND_MIXER_CD] =	"CD Playback Volume",
+	[SOUND_MIXER_IMIX] =	"Monitor Mix Playback Volume",
+	[SOUND_MIXER_ALTPCM] =	"Headphone Playback Volume",
+	[SOUND_MIXER_RECLEV] =	"Capture Volume",
+	[SOUND_MIXER_IGAIN] =	"Capture Volume",
+	[SOUND_MIXER_OGAIN] =	"Playback Volume",
+	[SOUND_MIXER_LINE1] =	"Aux Playback Volume",
+	[SOUND_MIXER_LINE2] =	"Aux1 Playback Volume",
+	[SOUND_MIXER_LINE3] =	"Line1 Playback Volume",
+	[SOUND_MIXER_DIGITAL1] = "IEC958 Playback Volume",
+	[SOUND_MIXER_DIGITAL2] = "Digital Playback Volume",
+	[SOUND_MIXER_DIGITAL3] = "Digital1 Playback Volume",
+	[SOUND_MIXER_PHONEIN] =	"Phone Playback Volume",
+	[SOUND_MIXER_PHONEOUT] = "Master Mono Playback Volume",
+	[SOUND_MIXER_VIDEO] =	"Video Playback Volume",
+	[SOUND_MIXER_RADIO] =	"Radio Playback Volume",
+	[SOUND_MIXER_MONITOR] =	"Monitor Playback Volume",
+};
+
+static const char *rec_devices[SOUND_MIXER_NRDEVICES] = {
+	[SOUND_MIXER_VOLUME] =	"Mix Capture Switch",
+	[SOUND_MIXER_SYNTH] =	"Synth Capture Switch",
+	[SOUND_MIXER_PCM] =	"PCM Capture Switch",
+	[SOUND_MIXER_LINE] =	"Line Capture Switch",
+	[SOUND_MIXER_MIC] =	"Mic Capture Switch",
+	[SOUND_MIXER_CD] =	"CD Capture Switch",
+	[SOUND_MIXER_LINE1] =	"Aux Capture Switch",
+	[SOUND_MIXER_LINE2] =	"Aux1 Capture Switch",
+	[SOUND_MIXER_LINE3] =	"Line1 Capture Switch",
+	[SOUND_MIXER_DIGITAL1] = "IEC958 Capture Switch",
+	[SOUND_MIXER_DIGITAL2] = "Digital Capture Switch",
+	[SOUND_MIXER_DIGITAL3] = "Digital1 Capture Switch",
+	[SOUND_MIXER_PHONEIN] =	"Phone Capture Switch",
+	[SOUND_MIXER_VIDEO] =	"Video Capture Switch",
+	[SOUND_MIXER_RADIO] =	"Radio Capture Switch",
+};	
+
+static const char *rec_items[SOUND_MIXER_NRDEVICES] = {
+	[SOUND_MIXER_VOLUME] =	"Mix",
+	[SOUND_MIXER_SYNTH] =	"Synth",
+	[SOUND_MIXER_PCM] =	"PCM",
+	[SOUND_MIXER_LINE] =	"Line",
+	[SOUND_MIXER_MIC] =	"Mic",
+	[SOUND_MIXER_CD] =	"CD",
+	[SOUND_MIXER_LINE1] =	"Aux",
+	[SOUND_MIXER_LINE2] =	"Aux1",
+	[SOUND_MIXER_LINE3] =	"Line1",
+	[SOUND_MIXER_DIGITAL1] = "IEC958",
+	[SOUND_MIXER_DIGITAL2] = "Digital",
+	[SOUND_MIXER_DIGITAL3] = "Digital1",
+	[SOUND_MIXER_PHONEIN] =	"Phone",
+	[SOUND_MIXER_VIDEO] =	"Video",
+	[SOUND_MIXER_RADIO] =	"Radio",
+};	
+
+static void oss_close(snd_ctl_ext_t *ext)
+{
+	snd_ctl_oss_t *oss = ext->private_data;
+
+	close(oss->fd);
+	free(oss->device);
+	free(oss);
+}
+
+static int oss_elem_count(snd_ctl_ext_t *ext)
+{
+	snd_ctl_oss_t *oss = ext->private_data;
+	int num;
+
+	num = oss->num_vol_ctls;
+	if (oss->exclusive_input)
+		num++;
+	else if (oss->num_rec_items)
+		num += oss->num_rec_items;
+	return num;
+}
+
+static int oss_elem_list(snd_ctl_ext_t *ext, unsigned int offset, snd_ctl_elem_id_t *id)
+{
+	snd_ctl_oss_t *oss = ext->private_data;
+
+	snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_MIXER);
+	if (offset < oss->num_vol_ctls)
+		snd_ctl_elem_id_set_name(id, vol_devices[oss->vol_ctl[offset]]);
+	else if (oss->exclusive_input)
+		snd_ctl_elem_id_set_name(id, "Capture Source");
+	else {
+		offset -= oss->num_vol_ctls;
+		snd_ctl_elem_id_set_name(id, rec_devices[oss->rec_item[offset]]);
+	}
+	return 0;
+}
+
+#define OSS_KEY_DEVICE_MASK	0x1f
+#define OSS_KEY_CAPTURE_FLAG	(1 << 8)
+#define OSS_KEY_CAPTURE_MUX	(1 << 16)
+
+static snd_ctl_ext_key_t oss_find_elem(snd_ctl_ext_t *ext,
+				       const snd_ctl_elem_id_t *id)
+{
+	snd_ctl_oss_t *oss = ext->private_data;
+	const char *name;
+	int i, key;
+
+	name = snd_ctl_elem_id_get_name(id);
+	if (! strcmp(name, "Capture Source")) {
+		if (oss->exclusive_input)
+			return OSS_KEY_CAPTURE_MUX;
+		else
+			return SND_CTL_EXT_KEY_NOT_FOUND;
+	}
+	for (i = 0; i < oss->num_vol_ctls; i++) {
+		key = oss->vol_ctl[i];
+		if (! strcmp(name, vol_devices[key]))
+			return key;
+	}
+	for (i = 0; i < oss->num_rec_items; i++) {
+		key = oss->rec_item[i];
+		if (! strcmp(name, rec_devices[key]))
+			return key | OSS_KEY_CAPTURE_FLAG;
+	}
+	return SND_CTL_EXT_KEY_NOT_FOUND;
+}
+
+static int oss_get_attribute(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key,
+			     int *type, unsigned int *acc, unsigned int *count)
+{
+	snd_ctl_oss_t *oss = ext->private_data;
+
+	if (key == OSS_KEY_CAPTURE_MUX) {
+		*type = SND_CTL_ELEM_TYPE_ENUMERATED;
+		*acc = SND_CTL_EXT_ACCESS_READWRITE;
+		*count = 1;
+	} else if (key & OSS_KEY_CAPTURE_FLAG) {
+		*type = SND_CTL_ELEM_TYPE_BOOLEAN;
+		*acc = SND_CTL_EXT_ACCESS_READWRITE;
+		*count = 1;
+	} else {
+		*type = SND_CTL_ELEM_TYPE_INTEGER;
+		*acc = SND_CTL_EXT_ACCESS_READWRITE;
+		if (oss->stereo_mask & (1 << key))
+			*count = 2;
+		else
+			*count = 1;
+	}
+	return 0;
+}
+
+static int oss_get_integer_info(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key,
+				long *imin, long *imax, long *istep)
+{
+	*istep = 0;
+	*imin = 0;
+	*imax = 100;
+	return 0;
+}
+
+static int oss_get_enumerated_info(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key,
+				   unsigned int *items)
+{
+	snd_ctl_oss_t *oss = ext->private_data;
+
+	*items = oss->num_rec_items;
+	return 0;
+}
+
+static int oss_get_enumerated_name(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key,
+				   unsigned int item, char *name, size_t name_max_len)
+{
+	snd_ctl_oss_t *oss = ext->private_data;
+
+	if (item >= oss->num_rec_items)
+		return -EINVAL;
+	item = oss->rec_item[item];
+	strncpy(name, rec_items[item], name_max_len - 1);
+	name[name_max_len - 1] = 0;
+	return 0;
+}
+
+static int oss_read_integer(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, long *value)
+{
+	snd_ctl_oss_t *oss = ext->private_data;
+	int val;
+
+	if (key & OSS_KEY_CAPTURE_FLAG) {
+		key &= OSS_KEY_DEVICE_MASK;
+		if (ioctl(oss->fd, SOUND_MIXER_READ_RECSRC, &val) < 0)
+			return -errno;
+		*value = (val & (1 << key)) ? 1 : 0;
+	} else {
+		if (ioctl(oss->fd, MIXER_READ(key), &val) < 0)
+			return -errno;
+		*value = val & 0xff;
+		if (oss->stereo_mask & (1 << key))
+			value[1] = (val >> 8) & 0xff;
+	}
+	return 0;
+}
+
+static int oss_read_enumerated(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, unsigned int *items)
+{
+	snd_ctl_oss_t *oss = ext->private_data;
+	int i, val;
+
+	*items = 0;
+	if (ioctl(oss->fd, SOUND_MIXER_READ_RECSRC, &val) < 0)
+		return -errno;
+	for (i = 0; i < oss->num_rec_items; i++) {
+		if (val & (1 << oss->rec_item[i])) {
+			*items = i;
+			break;
+		}
+	}
+	return 0;
+}
+
+static int oss_write_integer(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, long *value)
+{
+	snd_ctl_oss_t *oss = ext->private_data;
+	int val, oval;
+
+	if (key & OSS_KEY_CAPTURE_FLAG) {
+		key &= OSS_KEY_DEVICE_MASK;
+		if (ioctl(oss->fd, SOUND_MIXER_READ_RECSRC, &oval) < 0)
+			return -errno;
+		if (*value)
+			val = oval | (1 << key);
+		else
+			val = oval & ~(1 << key);
+		if (oval == val)
+			return 0;
+		if (ioctl(oss->fd, SOUND_MIXER_WRITE_RECSRC, &val) < 0)
+			return -errno;
+		return 1;
+	} else {
+		val = *value;
+		if (oss->stereo_mask & (1 << key))
+			val |= value[1] << 8;
+		if (ioctl(oss->fd, MIXER_READ(key), &oval) < 0)
+			return -errno;
+		if (oval == val)
+			return 0;
+		if (ioctl(oss->fd, MIXER_WRITE(key), &val) < 0)
+			return -errno;
+		return 1;
+	}
+}
+
+static int oss_write_enumerated(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key,
+				unsigned int *items)
+{
+	snd_ctl_oss_t *oss = ext->private_data;
+	int val, oval;
+
+	if (ioctl(oss->fd, SOUND_MIXER_READ_RECSRC, &oval) < 0)
+		return -errno;
+	val = 1 << oss->rec_item[*items];
+	if (val == oval)
+		return 0;
+	if (ioctl(oss->fd, SOUND_MIXER_WRITE_RECSRC, &val) < 0)
+		return -errno;
+	return 1;
+}
+
+static int oss_read_event(snd_ctl_ext_t *ext, snd_ctl_elem_id_t *id,
+			  unsigned int *event_mask)
+{
+	return -EAGAIN;
+}
+
+static snd_ctl_ext_callback_t oss_ext_callback = {
+	.close = oss_close,
+	.elem_count = oss_elem_count,
+	.elem_list = oss_elem_list,
+	.find_elem = oss_find_elem,
+	.get_attribute = oss_get_attribute,
+	.get_integer_info = oss_get_integer_info,
+	.get_enumerated_info = oss_get_enumerated_info,
+	.get_enumerated_name = oss_get_enumerated_name,
+	.read_integer = oss_read_integer,
+	.read_enumerated = oss_read_enumerated,
+	.write_integer = oss_write_integer,
+	.write_enumerated = oss_write_enumerated,
+	.read_event = oss_read_event,
+};
+
+
+SND_CTL_PLUGIN_DEFINE_FUNC(oss)
+{
+	snd_config_iterator_t it, next;
+	const char *device = "/dev/mixer";
+	struct mixer_info mixinfo;
+	int i, err, val;
+	snd_ctl_oss_t *oss;
+	
+	snd_config_for_each(it, next, conf) {
+		snd_config_t *n = snd_config_iterator_entry(it);
+		const char *id;
+		if (snd_config_get_id(n, &id) < 0)
+			continue;
+		if (strcmp(id, "comment") == 0 || strcmp(id, "type") == 0)
+			continue;
+		if (strcmp(id, "device") == 0) {
+			if (snd_config_get_string(n, &device) < 0) {
+				SNDERR("Invalid type for %s", id);
+				return -EINVAL;
+			}
+			continue;
+		}
+		SNDERR("Unknown field %s", id);
+		return -EINVAL;
+	}
+
+	oss = calloc(1, sizeof(*oss));
+	oss->device = strdup(device);
+	oss->fd = -1;
+	if (oss->device == NULL) {
+		SNDERR("cannot allocate");
+		free(oss);
+		return -ENOMEM;
+	}
+	oss->fd = open(device, O_RDWR);
+	if (oss->fd < 0) {
+		err = -errno;
+		SNDERR("Cannot open device %s", device);
+		goto error;
+	}
+
+	if (ioctl(oss->fd, SOUND_MIXER_INFO, &mixinfo) < 0) {
+		err = -errno;
+		SNDERR("Cannot get mixer info for device %s", device);
+		goto error;
+	}
+
+	oss->ext.version = SND_CTL_EXT_VERSION;
+	oss->ext.card_idx = 0; /* FIXME */
+	strncpy(oss->ext.id, mixinfo.id, sizeof(oss->ext.id) - 1);
+	strcpy(oss->ext.driver, "OSS-Emulation");
+	strncpy(oss->ext.name, mixinfo.name, sizeof(oss->ext.name) - 1);
+	strncpy(oss->ext.longname, mixinfo.name, sizeof(oss->ext.longname) - 1);
+	strncpy(oss->ext.mixername, mixinfo.name, sizeof(oss->ext.mixername) - 1);
+	oss->ext.poll_fd = -1;
+	oss->ext.callback = &oss_ext_callback;
+	oss->ext.private_data = oss;
+
+	oss->num_vol_ctls = 0;
+	val = 0;
+	if (ioctl(oss->fd, SOUND_MIXER_READ_DEVMASK, &val) < 0)
+		perror("ctl_oss: DEVMASK error");
+	else {
+		for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
+			if ((val & (1 << i)) && vol_devices[i])
+				oss->vol_ctl[oss->num_vol_ctls++] = i;
+		}
+	}
+
+	if (ioctl(oss->fd, SOUND_MIXER_READ_STEREODEVS, &oss->stereo_mask) < 0)
+		perror("ctl_oss: STEREODEVS error");
+	val = 0;
+	if (ioctl(oss->fd, SOUND_MIXER_READ_CAPS, &val) < 0)
+		perror("ctl_oss: MIXER_CAPS error");
+	else if (val & SOUND_CAP_EXCL_INPUT)
+		oss->exclusive_input = 1;
+
+	oss->num_rec_items = 0;
+	val = 0;
+	if (ioctl(oss->fd, SOUND_MIXER_READ_RECMASK, &val) < 0)
+		perror("ctl_oss: MIXER_RECMASK error");
+	else {
+		for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
+			if (val & (1 << i)) {
+				if (oss->exclusive_input) {
+					if (! rec_items[i])
+						continue;
+				} else {
+					if (! rec_devices[i])
+						continue;
+				}
+				oss->rec_item[oss->num_rec_items++] = i;
+			}
+		}
+	}
+	if (! oss->num_rec_items)
+		oss->exclusive_input = 0;
+
+	err = snd_ctl_ext_create(&oss->ext, name, mode);
+	if (err < 0)
+		goto error;
+
+	*handlep = oss->ext.handle;
+	return 0;
+
+ error:
+	if (oss->fd >= 0)
+		close(oss->fd);
+	free(oss->device);
+	free(oss);
+	return err;
+}
+
+SND_CTL_PLUGIN_SYMBOL(oss);