This patch file adds an ALSA External Control plugin. This source uses
the dsp-protocol
implementation.
The plugin probes for all communication channel at the start time. It
will handle only
channels specified into alsa configuration file. An configuration example is:
# Mixer
ctl.!default {
type dsp_ctl
playback_devices ["/dev/dsptask/pcm2"]
recording_devices ["/dev/dsptask/pcm_rec"]
}
Signed-off-by: Eduardo Valentin <eduardo.valentin@xxxxxxxxxxx>
diffstat:
dsp-ctl.c | 641 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 641 insertions(+)
--
Eduardo Bezerra Valentin
diff -pruN a/maemo/dsp-ctl.c b/maemo/dsp-ctl.c
--- a/maemo/dsp-ctl.c 1969-12-31 20:00:00.000000000 -0400
+++ b/maemo/dsp-ctl.c 2006-10-11 14:36:58.000000000 -0400
@@ -0,0 +1,641 @@
+/**
+ * @file dsp-ctl.c
+ * @brief CTL External plugin implementation.
+ * <p>
+ * Copyright (C) 2006 Nokia Corporation
+ * <p>
+ * Contact: Eduardo Bezerra Valentin <eduardo.valentin@xxxxxxxxxxx>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library 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.
+ * */
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <alsa/asoundlib.h>
+#include <alsa/control_external.h>
+#include <string.h>
+#include "list.h"
+#include "debug.h"
+#include "dsp-protocol.h"
+#include "constants.h"
+
+#define PLAYBACK_VOLUME_CONTROL_NAME "PCM Playback Volume"
+#define PLAYBACK_MUTE_CONTROL_NAME "PCM Playback Switch"
+#define RECORDING_CONTROL_NAME "Capture Switch"
+
+/**
+ * data structure to represent a dsp task device node.
+ */
+typedef struct {
+ dsp_protocol_t *dsp_protocol;
+ char *name;
+ int channels;
+ struct list_head list;
+} control_list_t;
+
+/**
+ * data structure to represent this plugin information.
+ */
+typedef struct snd_ctl_dsp {
+ snd_ctl_ext_t ext;
+ int num_playbacks;
+ int num_recordings;
+ control_list_t **controls;
+ control_list_t playback_devices;
+ control_list_t recording_devices;
+} snd_ctl_dsp_t;
+
+static snd_ctl_dsp_t *free_ref;
+/**
+ * @param control_list control list to be freed.
+ *
+ * It passes through this control list and frees
+ * all its nodes.
+ *
+ * @return zero. success.
+ */
+int free_control_list(control_list_t * control_list)
+{
+ struct list_head *pos, *q;
+ control_list_t *tmp;
+ list_for_each_safe(pos, q, &control_list->list) {
+ tmp = list_entry(pos, control_list_t, list);
+ list_del(pos);
+ free(tmp->name);
+ close(tmp->dsp_protocol->fd);
+ dsp_protocol_destroy(&(tmp->dsp_protocol));
+ free(tmp);
+ }
+ return 0;
+}
+
+/**
+ * @param ext snd_ctl_ext_t structure.
+ *
+ * It is the close event handler for this plugin.
+ * It frees all the allocated memory.
+ *
+ * @return zero. success.
+ */
+static void dsp_ctl_close(snd_ctl_ext_t * ext)
+{
+ snd_ctl_dsp_t *dsp_ctl = ext->private_data;
+ DENTER();
+ free(dsp_ctl->controls);
+ free_control_list(&(dsp_ctl->playback_devices));
+ free_control_list(&(dsp_ctl->recording_devices));
+// free(dsp_ctl);
+ DLEAVE(0);
+}
+
+/**
+ * @param ext snd_ctl_ext_t structure.
+ *
+ * It returns number of controls to be used by this
+ * plugin. It is based on number of recording and playback
+ * device nodes configured to be handled by this plugin.
+ *
+ * @return number of controls.
+ */
+static int dsp_ctl_elem_count(snd_ctl_ext_t * ext)
+{
+ snd_ctl_dsp_t *dsp_ctl = ext->private_data;
+ int ret = 2 * dsp_ctl->num_playbacks + dsp_ctl->num_recordings;
+ DENTER();
+ DLEAVE(ret);
+ return ret;
+}
+
+/**
+ * @param ext snd_ctl_ext_t structure.
+ * @param offset offset of current control.
+ * @param id id of current control element.
+ *
+ * It sets name and index for a control based
+ * of its offset.
+ *
+ * @return zero. success.
+ */
+static int dsp_ctl_elem_list(snd_ctl_ext_t * ext, unsigned int offset,
+ snd_ctl_elem_id_t * id)
+{
+ snd_ctl_dsp_t *dsp_ctl = ext->private_data;
+ int ret = 0;
+
+ DENTER();
+ snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_MIXER);
+ if (offset < 2 * dsp_ctl->num_playbacks) {
+ if (offset % 2 == 1)
+ snd_ctl_elem_id_set_name(id,
+ PLAYBACK_MUTE_CONTROL_NAME);
+ else
+ snd_ctl_elem_id_set_name(id,
+ PLAYBACK_VOLUME_CONTROL_NAME);
+ offset /= 2;
+ } else {
+ offset -= 2 * dsp_ctl->num_playbacks;
+ snd_ctl_elem_id_set_name(id, RECORDING_CONTROL_NAME);
+ }
+ snd_ctl_elem_id_set_index(id, offset);
+ DLEAVE(ret);
+ return ret;
+}
+
+/**
+ * @param ext snd_ctl_ext_t structure.
+ * @param id control element id from alsa-lib
+ *
+ * It searches for an control element using
+ * its name and index. If this control can
+ * be found, it returns a key to represent it
+ * for future use. This key is an index of an
+ * array of controls whose is composed of three
+ * types of elements: PCM Volume, PCM Switch and
+ * Capture Switch. This array is organized as
+ * follows:
+ * pv0, ps0, pv1, ps1, ..., pv_n, ps_n, cs0, cs1, ..., cs_m
+ *
+ * where, pvi is the i-th PCM Volume Control
+ * psi is the i-th PCM Switch Control
+ * csi is the i-th Capture Switch Control
+ * n - is the number of Playback devices
+ * m - is the number of Recording devices
+ *
+ * @return if control is not found, returns SND_CTL_EXT_KEY_NOT_FOUND.
+ * Otherwise, returns a key of control.
+ */
+static snd_ctl_ext_key_t dsp_ctl_find_elem(snd_ctl_ext_t * ext,
+ const snd_ctl_elem_id_t * id)
+{
+ snd_ctl_dsp_t *dsp_ctl = ext->private_data;
+ snd_ctl_ext_key_t ret = SND_CTL_EXT_KEY_NOT_FOUND;
+ int idx;
+ const char *name;
+
+ DENTER();
+ idx = snd_ctl_elem_id_get_index(id);
+ name = snd_ctl_elem_id_get_name(id);
+ if (strcmp(PLAYBACK_VOLUME_CONTROL_NAME, name) == 0)
+ ret = idx * 2;
+ else if (strcmp(PLAYBACK_MUTE_CONTROL_NAME, name) == 0)
+ ret = idx * 2 + 1;
+ else
+ ret = 2 * dsp_ctl->num_playbacks + idx;
+ if (ret == SND_CTL_EXT_KEY_NOT_FOUND)
+ DPRINT("Not Found name %s, index %d\n",
+ snd_ctl_elem_id_get_name(id), idx);
+ DLEAVE((int)ret);
+ return ret;
+}
+
+/**
+ * @param ext snd_ctl_ext_t structure.
+ * @param key current control key to be handled.
+ * @param type type of this control.
+ * @param acc access type of this control.
+ * @param count number of channels of this control.
+ *
+ * It provides information about a control.
+ * Playback device node has an integer and a boolean
+ * control. Recording has only boolean control.
+ *
+ * @return zero. success.
+ */
+static int dsp_ctl_get_attribute(snd_ctl_ext_t * ext, snd_ctl_ext_key_t key,
+ int *type, unsigned int *acc,
+ unsigned int *count)
+{
+ snd_ctl_dsp_t *dsp_ctl = ext->private_data;
+ int ret = 0;
+ DENTER();
+
+ if (key >= 2 * dsp_ctl->num_playbacks || key % 2 == 1)
+ *type = SND_CTL_ELEM_TYPE_BOOLEAN;
+ else
+ *type = SND_CTL_ELEM_TYPE_INTEGER;
+
+ *count = dsp_ctl->controls[key]->channels;
+ *acc = SND_CTL_EXT_ACCESS_READWRITE;
+ DLEAVE(ret);
+ return ret;
+}
+
+/**
+ * @param ext snd_ctl_ext_t structure.
+ * @param key current control key to be handled.
+ * @param imin minimum value of this integer control.
+ * @param imax maximum value of this integer control.
+ * @param istep steps value of this integer control.
+ *
+ * It provides information about integer control. It
+ * consideres both boolean and integer controls.
+ *
+ * @return zero. success.
+ */
+static int dsp_ctl_get_integer_info(snd_ctl_ext_t * ext, snd_ctl_ext_key_t key,
+ long *imin, long *imax, long *istep)
+{
+ snd_ctl_dsp_t *dsp_ctl = ext->private_data;
+ DENTER();
+ *imin = 0;
+ if (key >= 2 * dsp_ctl->num_playbacks || key % 2 == 1)
+ *imax = 1;
+ else
+ *imax = 100;
+ *istep = 0;
+ DLEAVE(0);
+ return 0;
+}
+
+/**
+ * @param ext snd_ctl_ext_t structure.
+ * @param key current control key to be handled.
+ * @param value return value holder.
+ *
+ * It reads volume information from dsp task node and
+ * fills it into value to alsa-lib.
+ *
+ * @return zero. success.
+ */
+static int dsp_ctl_read_integer(snd_ctl_ext_t * ext, snd_ctl_ext_key_t key,
+ long *value)
+{
+ int ret = 0;
+ char left, right;
+ snd_ctl_dsp_t *dsp_ctl = ext->private_data;
+ control_list_t *tmp = dsp_ctl->controls[key];
+
+ DENTER();
+ if (key >= 2 * dsp_ctl->num_playbacks || key % 2 == 1) {
+ ret = dsp_protocol_get_mute(tmp->dsp_protocol);
+ if (ret >= 0) {
+ left = ret == 0 ? 1 : 0;
+ right = left;
+ }
+ } else
+ ret = dsp_protocol_get_volume(tmp->dsp_protocol, &left, &right);
+ if (ret >= 0) {
+ value[0] = left;
+ if (tmp->channels == 2)
+ value[1] = right;
+ } else {
+ value[0] = 0;
+ if (tmp->channels == 2)
+ value[1] = 0;
+ ret = 0;
+ }
+
+ DLEAVE(ret);
+ return ret;
+}
+
+/**
+ * @param ext snd_ctl_ext_t structure.
+ * @param key current control key to be handled.
+ * @param value volume value to be written.
+ *
+ * It writes volume information to dsp task node from
+ * value that comes from alsa-lib. It checks if value
+ * coming from alsa-lib is different of value in dsp
+ * side.
+ *
+ * @return zero if not updated. one if updated.
+ */
+static int dsp_ctl_write_integer(snd_ctl_ext_t * ext, snd_ctl_ext_key_t key,
+ long *value)
+{
+ int ret;
+ char left, right;
+ snd_ctl_dsp_t *dsp_ctl = ext->private_data;
+ control_list_t *tmp = dsp_ctl->controls[key];
+
+ DENTER();
+ if (key >= 2 * dsp_ctl->num_playbacks || key % 2 == 1) {
+ if ((ret = dsp_protocol_get_mute(tmp->dsp_protocol)) < 0)
+ goto zero;
+ left = ret == 0 ? 1 : 0;
+ right = left;
+ } else
+ if ((ret =
+ dsp_protocol_get_volume(tmp->dsp_protocol, &left, &right)) < 0)
+ goto zero;
+
+ if (tmp->channels == 2) {
+ if (left == value[0] && right == value[1]) {
+ ret = 0;
+ goto out;
+ }
+ right = value[1];
+ left = value[0];
+ } else {
+ if (left == value[0]) {
+ ret = 0;
+ goto out;
+ }
+ right = left = value[0];
+ }
+
+ if (key >= 2 * dsp_ctl->num_playbacks || key % 2 == 1) {
+ if ((ret =
+ dsp_protocol_set_mute(tmp->dsp_protocol,
+ left == 0 ? 1 : 0)) < 0)
+ goto zero;
+ } else
+ if ((ret =
+ dsp_protocol_set_volume(tmp->dsp_protocol, left, right)) < 0)
+ goto zero;
+ ret = 1;
+ goto out;
+ zero:
+ value[0] = 0;
+ if (tmp->channels == 2)
+ value[1] = 0;
+ ret = 0;
+ out:
+ DLEAVE(ret);
+ return ret;
+}
+
+/**
+ * @param ext
+ * @param id
+ * @param event_mask
+ *
+ * @return -EIO
+ */
+static int dsp_ctl_read_event(snd_ctl_ext_t * ext, snd_ctl_elem_id_t * id,
+ unsigned int *event_mask)
+{
+ return -EIO;
+}
+
+/**
+ * @param n configuration file parse tree.
+ * @param device_list list of device files to be filled.
+ *
+ * It searches for device file names in given configuration parse
+ * tree. When one device file name is found, it is filled into device_list.
+ *
+ * @return zero if success, otherwise a negative error code.
+ */
+static int fill_control_list(snd_config_t * n, control_list_t * control_list)
+{
+ snd_config_iterator_t j, nextj;
+ control_list_t *tmp;
+ long idx = 0;
+ DENTER();
+ INIT_LIST_HEAD(&control_list->list);
+ snd_config_for_each(j, nextj, n) {
+ snd_config_t *s = snd_config_iterator_entry(j);
+ const char *id_number;
+ long k;
+ if (snd_config_get_id(s, &id_number) < 0)
+ continue;
+ if (safe_strtol(id_number, &k) < 0) {
+ SNDERR("id of field %s is not an integer", id_number);
+ idx = -EINVAL;
+ goto out;
+ }
+ if (k == idx) {
+ idx++;
+ /* add to available dsp task nodes */
+ tmp = (control_list_t *) malloc(sizeof(control_list_t));
+ if (snd_config_get_ascii(s, &(tmp->name)) < 0) {
+ SNDERR("invalid ascii string for id %s\n",
+ id_number);
+ idx = -EINVAL;
+ goto out;
+ }
+ list_add(&(tmp->list), &(control_list->list));
+ }
+ }
+ out:
+ DLEAVE((int)idx);
+ return idx;
+}
+
+/**
+ * @param dsp_ctl snd_dsp_t structure.
+ *
+ * It probes all dsp tasks configured to be handled by this
+ * plugin. It gets all needed information about volume controling.
+ *
+ * @return zero if success, otherwise a negative error code.
+ */
+static int dsp_ctl_probe_dsp_task(snd_ctl_dsp_t * dsp_ctl)
+{
+ int err = 0, i;
+ control_list_t *tmp;
+ struct list_head *lists[2] =
+ { &(dsp_ctl->playback_devices.list),
+&(dsp_ctl->recording_devices.list) };
+ DENTER();
+ DPRINT("Probing dsp device nodes \n");
+ for (i = 0; i < 2; i++) {
+ list_for_each_entry(tmp, lists[i], list) {
+ DPRINT("Trying to use %s\n", tmp->name);
+ /* Initialise the dsp_protocol and create connection */
+ if ((err =
+ dsp_protocol_create(&(tmp->dsp_protocol))) < 0)
+ goto out;
+ if ((tmp->channels =
+ dsp_protocol_probe_node(tmp->dsp_protocol,
+ tmp->name)) < 0) {
+ DPRINT("%s is not available now\n", tmp->name);
+ err = tmp->channels;
+ close(tmp->dsp_protocol->fd); //memory leak?!?
+ goto out;
+ }
+ }
+ }
+ if (err < 0) {
+ DPRINT("No valid dsp task nodes for now. Exiting.\n");
+ }
+ out:
+ DLEAVE(err);
+ return err;
+}
+
+/**
+ * @param dsp_ctl snd_dsp_t structure.
+ *
+ * It fills an array of controls to represent PCM Volume,
+ * PCM Switch and Capture Switch controls.
+ *
+ * @return zero if success, otherwise a negative error code.
+ */
+static int dsp_ctl_fill_controls(snd_ctl_dsp_t * dsp_ctl)
+{
+ int ret = 0;
+ int i;
+ int num_controls = 2 * dsp_ctl->num_playbacks + dsp_ctl->num_recordings;
+ DENTER();
+ control_list_t *tmp;
+ dsp_ctl->controls = calloc(num_controls, sizeof(control_list_t *));
+ if (dsp_ctl->controls == NULL) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ i = 0;
+ /* Each pcm task node should have a PCM Volume and PCM Switch control */
+ list_for_each_entry(tmp, &(dsp_ctl->playback_devices.list), list) {
+ dsp_ctl->controls[i] = tmp;
+ dsp_ctl->controls[i + 1] = tmp;
+ i += 2;
+ }
+ /* Each pcm_rec node should have a Capture Switch control */
+ list_for_each_entry(tmp, &(dsp_ctl->recording_devices.list), list)
+ dsp_ctl->controls[i++] = tmp;
+
+ out:
+ DLEAVE(ret);
+ return ret;
+}
+
+/**
+ * Alsa-lib callback structure.
+ */
+static snd_ctl_ext_callback_t dsp_ctl_ext_callback = {
+ .close = dsp_ctl_close,
+ .elem_count = dsp_ctl_elem_count,
+ .elem_list = dsp_ctl_elem_list,
+ .find_elem = dsp_ctl_find_elem,
+ .get_attribute = dsp_ctl_get_attribute,
+ .get_integer_info = dsp_ctl_get_integer_info,
+ .read_integer = dsp_ctl_read_integer,
+ .write_integer = dsp_ctl_write_integer,
+ .read_event = dsp_ctl_read_event,
+};
+
+/**
+ * It initializes the alsa ctl plugin. It reads the parameters and creates the
+ * connection with the pcm device file.
+ *
+ * @return zero if success, otherwise a negative error code.
+ */
+SND_CTL_PLUGIN_DEFINE_FUNC(dsp_ctl)
+{
+ snd_config_iterator_t i, next;
+ snd_ctl_dsp_t *dsp_ctl;
+ int err;
+ int ret;
+
+ DENTER();
+ /* Allocate the structure */
+ dsp_ctl = calloc(1, sizeof(*dsp_ctl));
+ if (dsp_ctl == NULL) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ /* Read the configuration searching for configurated devices */
+ snd_config_for_each(i, next, conf) {
+ snd_config_t *n = snd_config_iterator_entry(i);
+ 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, "playback_devices") == 0) {
+ if (snd_config_get_type(n) == SND_CONFIG_TYPE_COMPOUND){
+ if ((dsp_ctl->num_playbacks =
+ fill_control_list(n,
+ &(dsp_ctl->
+ playback_devices))) < 0) {
+ SNDERR("Could not fill control"
+ " list for playback devices\n");
+ err = -EINVAL;
+ goto error;
+ }
+ } else {
+ SNDERR("Invalid type for %s", id);
+ err = -EINVAL;
+ goto error;
+ }
+ continue;
+ }
+ if (strcmp(id, "recording_devices") == 0) {
+ if (snd_config_get_type(n) == SND_CONFIG_TYPE_COMPOUND){
+ if ((dsp_ctl->num_recordings =
+ fill_control_list(n,
+ &(dsp_ctl->
+ recording_devices))) < 0) {
+ SNDERR("Could not fill string "
+ "list for recording devices\n");
+ err = -EINVAL;
+ goto error;
+ }
+ } else {
+ SNDERR("Invalid type for %s", id);
+ err = -EINVAL;
+ goto error;
+ }
+ continue;
+ }
+ SNDERR("Unknown field %s", id);
+ err = -EINVAL;
+ goto error;
+ }
+
+ if ((err = dsp_ctl_probe_dsp_task(dsp_ctl)) < 0)
+ goto error;
+
+ if ((err = dsp_ctl_fill_controls(dsp_ctl)) < 0)
+ goto error;
+ dsp_ctl->ext.version = SND_CTL_EXT_VERSION;
+ dsp_ctl->ext.card_idx = 0; /* FIXME */
+ strcpy(dsp_ctl->ext.id, "ALSA-DSP-CTL");
+ strcpy(dsp_ctl->ext.name, "Alsa-DSP external ctl plugin");
+ strcpy(dsp_ctl->ext.longname, "External Control Alsa plugin for DSP");
+ strcpy(dsp_ctl->ext.mixername, "ALSA-DSP plugin Mixer");
+ dsp_ctl->ext.callback = &dsp_ctl_ext_callback;
+ dsp_ctl->ext.private_data = dsp_ctl;
+ free_ref = dsp_ctl;
+
+ if ((err = snd_ctl_ext_create(&dsp_ctl->ext, name, mode)) < 0)
+ goto error;
+
+ *handlep = dsp_ctl->ext.handle;
+ ret = 0;
+ goto out;
+ error:
+ ret = err;
+ free(dsp_ctl);
+ out:
+ DLEAVE(ret);
+ return ret;
+}
+void dsp_ctl_descructor(void) __attribute__ ((destructor));
+
+void dsp_ctl_descructor(void)
+{
+ DENTER();
+ DPRINT("dsp ctl destructor\n");
+ DPRINT("checking for memories leaks and releasing resources\n");
+ if (free_ref) {
+ if (free_ref->controls)
+ free(free_ref->controls);
+
+ free_control_list(&(free_ref->playback_devices));
+
+ free_control_list(&(free_ref->recording_devices));
+
+ free(free_ref);
+ free_ref = NULL;
+ }
+ DLEAVE(0);
+
+}
+
+SND_CTL_PLUGIN_SYMBOL(dsp_ctl);
-------------------------------------------------------------------------
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