/*
* Copyright (C) 2013 The Android Open Source Project
* Inspired by TinyHW, written by Mark Brown at Wolfson Micro
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "audio_route"
/*#define LOG_NDEBUG 0*/
#include <errno.h>
#include <expat.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <cutils/log.h>
#include <tinyalsa/asoundlib.h>
#define BUF_SIZE 1024
#define MIXER_XML_PATH "/system/etc/mixer_paths.xml"
#define INITIAL_MIXER_PATH_SIZE 8
union ctl_values {
int *enumerated;
long *integer;
void *ptr;
unsigned char *bytes;
};
struct mixer_state {
struct mixer_ctl *ctl;
unsigned int num_values;
union ctl_values old_value;
union ctl_values new_value;
union ctl_values reset_value;
};
struct mixer_setting {
unsigned int ctl_index;
unsigned int num_values;
unsigned int type;
union ctl_values value;
};
struct mixer_value {
unsigned int ctl_index;
int index;
long value;
};
struct mixer_path {
char *name;
unsigned int size;
unsigned int length;
struct mixer_setting *setting;
};
struct audio_route {
struct mixer *mixer;
unsigned int num_mixer_ctls;
struct mixer_state *mixer_state;
unsigned int mixer_path_size;
unsigned int num_mixer_paths;
struct mixer_path *mixer_path;
};
struct config_parse_state {
struct audio_route *ar;
struct mixer_path *path;
int level;
};
/* path functions */
static bool is_supported_ctl_type(enum mixer_ctl_type type)
{
switch (type) {
case MIXER_CTL_TYPE_BOOL:
case MIXER_CTL_TYPE_INT:
case MIXER_CTL_TYPE_ENUM:
case MIXER_CTL_TYPE_BYTE:
return true;
default:
return false;
}
}
/* as they match in alsa */
static size_t sizeof_ctl_type(enum mixer_ctl_type type) {
switch (type) {
case MIXER_CTL_TYPE_BOOL:
case MIXER_CTL_TYPE_INT:
return sizeof(long);
case MIXER_CTL_TYPE_ENUM:
return sizeof(int);
case MIXER_CTL_TYPE_BYTE:
return sizeof(unsigned char);
case MIXER_CTL_TYPE_INT64:
case MIXER_CTL_TYPE_IEC958:
case MIXER_CTL_TYPE_UNKNOWN:
default:
LOG_ALWAYS_FATAL("Unsupported mixer ctl type: %d, check type before calling", (int)type);
return 0;
}
}
static inline struct mixer_ctl *index_to_ctl(struct audio_route *ar,
unsigned int ctl_index)
{
return ar->mixer_state[ctl_index].ctl;
}
#if 0
static void path_print(struct audio_route *ar, struct mixer_path *path)
{
unsigned int i;
unsigned int j;
ALOGE("Path: %s, length: %d", path->name, path->length);
for (i = 0; i < path->length; i++) {
struct mixer_ctl *ctl = index_to_ctl(ar, path->setting[i].ctl_index);
ALOGE(" id=%d: ctl=%s", i, mixer_ctl_get_name(ctl));
if (mixer_ctl_get_type(ctl) == MIXER_CTL_TYPE_BYTE) {
for (j = 0; j < path->setting[i].num_values; j++)
ALOGE(" id=%d value=0x%02x", j, path->setting[i].value.bytes[j]);
} else if (mixer_ctl_get_type(ctl) == MIXER_CTL_TYPE_ENUM) {
for (j = 0; j < path->setting[i].num_values; j++)
ALOGE(" id=%d value=%d", j, path->setting[i].value.enumerated[j]);
} else {
for (j = 0; j < path->setting[i].num_values; j++)
ALOGE(" id=%d value=%ld", j, path->setting[i].value.integer[j]);
}
}
}
#endif
static void path_free(struct audio_route *ar)
{
unsigned int i;
for (i = 0; i < ar->num_mixer_paths; i++) {
if (ar->mixer_path[i].name)
free(ar->mixer_path[i].name);
if (ar->mixer_path[i].setting) {
if (ar->mixer_path[i].setting->value.ptr)
free(ar->mixer_path[i].setting->value.ptr);
free(ar->mixer_path[i].setting);
}
}
free(ar->mixer_path);
ar->mixer_path = NULL;
ar->mixer_path_size = 0;
}
static struct mixer_path *path_get_by_name(struct audio_route *ar,
const char *name)
{
unsigned int i;
for (i = 0; i < ar->num_mixer_paths; i++)
if (strcmp(ar->mixer_path[i].name, name) == 0)
return &ar->mixer_path[i];
return NULL;
}
static struct mixer_path *path_create(struct audio_route *ar, const char *name)
{
struct mixer_path *new_mixer_path = NULL;
if (path_get_by_name(ar, name)) {
ALOGE("Path name '%s' already exists", name);
return NULL;
}
/* check if we need to allocate more space for mixer paths */
if (ar->mixer_path_size <= ar->num_mixer_paths) {
if (ar->mixer_path_size == 0)
ar->mixer_path_size = INITIAL_MIXER_PATH_SIZE;
else
ar->mixer_path_size *= 2;
new_mixer_path = realloc(ar->mixer_path, ar->mixer_path_size *
sizeof(struct mixer_path));
if (new_mixer_path == NULL) {
ALOGE("Unable to allocate more paths");
return NULL;
} else {
ar->mixer_path = new_mixer_path;
}
}
/* initialise the new mixer path */
ar->mixer_path[ar->num_mixer_paths].name = strdup(name);
ar->mixer_path[ar->num_mixer_paths].size = 0;
ar->mixer_path[ar->num_mixer_paths].length = 0;
ar->mixer_path[ar->num_mixer_paths].setting = NULL;
/* return the mixer path just added, then increment number of them */
return &ar->mixer_path[ar->num_mixer_paths++];
}
static int find_ctl_index_in_path(struct mixer_path *path,
unsigned int ctl_index)
{
unsigned int i;
for (i = 0; i < path->length; i++)
if (path->setting[i].ctl_index == ctl_index)
return i;
return -1;
}
static int alloc_path_setting(struct mixer_path *path)
{
struct mixer_setting *new_path_setting;
int path_index;
/* check if we need to allocate more space for path settings */
if (path->size <= path->length) {
if (path->size == 0)
path->size = INITIAL_MIXER_PATH_SIZE;
else
path->size *= 2;
new_path_setting = realloc(path->setting,
path->size * sizeof(struct mixer_setting));
if (new_path_setting == NULL) {
ALOGE("Unable to allocate more path settings");
return -1;
} else {
path->setting = new_path_setting;
}
}
path_index = path->length;
path->length++;
return path_index;
}
static int path_add_setting(struct audio_route *ar, struct mixer_path *path,
struct mixer_setting *setting)
{
int path_index;
if (find_ctl_index_in_path(path, setting->ctl_index) != -1) {
struct mixer_ctl *ctl = index_to_ctl(ar, setting->ctl_index);
ALOGE("Control '%s' already exists in path '%s'",
mixer_ctl_get_name(ctl), path->name);
return -1;
}
if (!is_supported_ctl_type(setting->type)) {
ALOGE("unsupported type %d", (int)setting->type);
return -1;
}
path_index = alloc_path_setting(path);
if (path_index < 0)
return -1;
path->setting[path_index].ctl_index = setting->ctl_index;
path->setting[path_index].type = setting->type;
path->setting[path_index].num_values = setting->num_values;
size_t value_sz = sizeof_ctl_type(setting->type);
path->setting[path_index].value.ptr = calloc(setting->num_values, value_sz);
/* copy all values */
memcpy(path->setting[path_index].value.ptr, setting->value.ptr,
setting->num_values * value_sz);
return 0;
}
static int path_add_value(struct audio_route *ar, struct mixer_path *path,
struct mixer_value *mixer_value)
{
unsigned int i;
int path_index;
unsigned int num_values;
struct mixer_ctl *ctl;
/* Check that mixer value index is within range */
ctl = index_to_ctl(ar, mixer_value->ctl_index);
num_values = mixer_ctl_get_num_values(ctl);
if (mixer_value->index >= (int)num_values) {
ALOGE("mixer index %d is out of range for '%s'", mixer_value->index,
mixer_ctl_get_name(ctl));
return -1;
}
path_index = find_ctl_index_in_path(path, mixer_value->ctl_index);
if (path_index < 0) {
/* New path */
enum mixer_ctl_type type = mixer_ctl_get_type(ctl);
if (!is_supported_ctl_type(type)) {
ALOGE("unsupported type %d", (int)type);
return -1;
}
path_index = alloc_path_setting(path);
if (path_index < 0)
return -1;
/* initialise the new path setting */
path->setting[path_index].ctl_index = mixer_value->ctl_index;
path->setting[path_index].num_values = num_values;
path->setting[path_index].type = type;
size_t value_sz = sizeof_ctl_type(type);
path->setting[path_index].value.ptr = calloc(num_values, value_sz);
if (path->setting[path_index].type == MIXER_CTL_TYPE_BYTE)
path->setting[path_index].value.bytes[0] = mixer_value->value;
else if (path->setting[path_index].type == MIXER_CTL_TYPE_ENUM)
path->setting[path_index].value.enumerated[0] = mixer_value->value;
else
path->setting[path_index].value.integer[0] = mixer_value->value;
}
if (mixer_value->index == -1) {
/* set all values the same */
if (path->setting[path_index].type == MIXER_CTL_TYPE_BYTE) {
for (i = 0; i < num_values; i++)
path->setting[path_index].value.bytes[i] = mixer_value->value;
} else if (path->setting[path_index].type == MIXER_CTL_TYPE_ENUM) {
for (i = 0; i < num_values; i++)
path->setting[path_index].value.enumerated[i] = mixer_value->value;
} else {
for (i = 0; i < num_values; i++)
path->setting[path_index].value.integer[i] = mixer_value->value;
}
} else {
/* set only one value */
if (path->setting[path_index].type == MIXER_CTL_TYPE_BYTE)
path->setting[path_index].value.bytes[mixer_value->index] = mixer_value->value;
else if (path->setting[path_index].type == MIXER_CTL_TYPE_ENUM)
path->setting[path_index].value.enumerated[mixer_value->index] = mixer_value->value;
else
path->setting[path_index].value.integer[mixer_value->index] = mixer_value->value;
}
return 0;
}
static int path_add_path(struct audio_route *ar, struct mixer_path *path,
struct mixer_path *sub_path)
{
unsigned int i;
for (i = 0; i < sub_path->length; i++)
if (path_add_setting(ar, path, &sub_path->setting[i]) < 0)
return -1;
return 0;
}
static int path_apply(struct audio_route *ar, struct mixer_path *path)
{
unsigned int i;
unsigned int ctl_index;
struct mixer_ctl *ctl;
enum mixer_ctl_type type;
for (i = 0; i < path->length; i++) {
ctl_index = path->setting[i].ctl_index;
ctl = index_to_ctl(ar, ctl_index);
type = mixer_ctl_get_type(ctl);
if (!is_supported_ctl_type(type))
continue;
size_t value_sz = sizeof_ctl_type(type);
memcpy(ar->mixer_state[ctl_index].new_value.ptr, path->setting[i].value.ptr,
path->setting[i].num_values * value_sz);
}
return 0;
}
static int path_reset(struct audio_route *ar, struct mixer_path *path)
{
unsigned int i;
unsigned int ctl_index;
struct mixer_ctl *ctl;
enum mixer_ctl_type type;
for (i = 0; i < path->length; i++) {
ctl_index = path->setting[i].ctl_index;
ctl = index_to_ctl(ar, ctl_index);
type = mixer_ctl_get_type(ctl);
if (!is_supported_ctl_type(type))
continue;
size_t value_sz = sizeof_ctl_type(type);
/* reset the value(s) */
memcpy(ar->mixer_state[ctl_index].new_value.ptr,
ar->mixer_state[ctl_index].reset_value.ptr,
ar->mixer_state[ctl_index].num_values * value_sz);
}
return 0;
}
/* mixer helper function */
static int mixer_enum_string_to_value(struct mixer_ctl *ctl, const char *string)
{
unsigned int i;
unsigned int num_values = mixer_ctl_get_num_enums(ctl);
if (string == NULL) {
ALOGE("NULL enum value string passed to mixer_enum_string_to_value() for ctl %s",
mixer_ctl_get_name(ctl));
return 0;
}
/* Search the enum strings for a particular one */
for (i = 0; i < num_values; i++) {
if (strcmp(mixer_ctl_get_enum_string(ctl, i), string) == 0)
break;
}
if (i == num_values) {
ALOGE("unknown enum value string %s for ctl %s",
string, mixer_ctl_get_name(ctl));
return 0;
}
return i;
}
static void start_tag(void *data, const XML_Char *tag_name,
const XML_Char **attr)
{
const XML_Char *attr_name = NULL;
const XML_Char *attr_id = NULL;
const XML_Char *attr_value = NULL;
struct config_parse_state *state = data;
struct audio_route *ar = state->ar;
unsigned int i;
unsigned int ctl_index;
struct mixer_ctl *ctl;
long value;
unsigned int id;
struct mixer_value mixer_value;
enum mixer_ctl_type type;
/* Get name, id and value attributes (these may be empty) */
for (i = 0; attr[i]; i += 2) {
if (strcmp(attr[i], "name") == 0)
attr_name = attr[i + 1];
if (strcmp(attr[i], "id") == 0)
attr_id = attr[i + 1];
else if (strcmp(attr[i], "value") == 0)
attr_value = attr[i + 1];
}
/* Look at tags */
if (strcmp(tag_name, "path") == 0) {
if (attr_name == NULL) {
ALOGE("Unnamed path!");
} else {
if (state->level == 1) {
/* top level path: create and stash the path */
state->path = path_create(ar, (char *)attr_name);
} else {
/* nested path */
struct mixer_path *sub_path = path_get_by_name(ar, attr_name);
path_add_path(ar, state->path, sub_path);
}
}
}
else if (strcmp(tag_name, "ctl") == 0) {
/* Obtain the mixer ctl and value */
ctl = mixer_get_ctl_by_name(ar->mixer, attr_name);
if (ctl == NULL) {
ALOGE("Control '%s' doesn't exist - skipping", attr_name);
goto done;
}
switch (mixer_ctl_get_type(ctl)) {
case MIXER_CTL_TYPE_BOOL:
case MIXER_CTL_TYPE_INT:
value = strtol((char *)attr_value, NULL, 0);
break;
case MIXER_CTL_TYPE_BYTE:
value = (unsigned char) strtol((char *)attr_value, NULL, 16);
break;
case MIXER_CTL_TYPE_ENUM:
value = mixer_enum_string_to_value(ctl, (char *)attr_value);
break;
default:
value = 0;
break;
}
/* locate the mixer ctl in the list */
for (ctl_index = 0; ctl_index < ar->num_mixer_ctls; ctl_index++) {
if (ar->mixer_state[ctl_index].ctl == ctl)
break;
}
if (state->level == 1) {
/* top level ctl (initial setting) */
type = mixer_ctl_get_type(ctl);
if (is_supported_ctl_type(type)) {
/* apply the new value */
if (attr_id) {
/* set only one value */
id = atoi((char *)attr_id);
if (id < ar->mixer_state[ctl_index].num_values)
if (type == MIXER_CTL_TYPE_BYTE)
ar->mixer_state[ctl_index].new_value.bytes[id] = value;
else if (type == MIXER_CTL_TYPE_ENUM)
ar->mixer_state[ctl_index].new_value.enumerated[id] = value;
else
ar->mixer_state[ctl_index].new_value.integer[id] = value;
else
ALOGE("value id out of range for mixer ctl '%s'",
mixer_ctl_get_name(ctl));
} else {
/* set all values the same */
for (i = 0; i < ar->mixer_state[ctl_index].num_values; i++)
if (type == MIXER_CTL_TYPE_BYTE)
ar->mixer_state[ctl_index].new_value.bytes[i] = value;
else if (type == MIXER_CTL_TYPE_ENUM)
ar->mixer_state[ctl_index].new_value.enumerated[i] = value;
else
ar->mixer_state[ctl_index].new_value.integer[i] = value;
}
}
} else {
/* nested ctl (within a path) */
mixer_value.ctl_index = ctl_index;
mixer_value.value = value;
if (attr_id)
mixer_value.index = atoi((char *)attr_id);
else
mixer_value.index = -1;
path_add_value(ar, state->path, &mixer_value);
}
}
done:
state->level++;
}
static void end_tag(void *data, const XML_Char *tag_name)
{
struct config_parse_state *state = data;
(void)tag_name;
state->level--;
}
static int alloc_mixer_state(struct audio_route *ar)
{
unsigned int i;
unsigned int num_values;
struct mixer_ctl *ctl;
enum mixer_ctl_type type;
ar->num_mixer_ctls = mixer_get_num_ctls(ar->mixer);
ar->mixer_state = calloc(ar->num_mixer_ctls, sizeof(struct mixer_state));
if (!ar->mixer_state)
return -1;
for (i = 0; i < ar->num_mixer_ctls; i++) {
ctl = mixer_get_ctl(ar->mixer, i);
num_values = mixer_ctl_get_num_values(ctl);
ar->mixer_state[i].ctl = ctl;
ar->mixer_state[i].num_values = num_values;
/* Skip unsupported types that are not supported yet in XML */
type = mixer_ctl_get_type(ctl);
if (!is_supported_ctl_type(type))
continue;
size_t value_sz = sizeof_ctl_type(type);
ar->mixer_state[i].old_value.ptr = calloc(num_values, value_sz);
ar->mixer_state[i].new_value.ptr = calloc(num_values, value_sz);
ar->mixer_state[i].reset_value.ptr = calloc(num_values, value_sz);
if (type == MIXER_CTL_TYPE_ENUM)
ar->mixer_state[i].old_value.enumerated[0] = mixer_ctl_get_value(ctl, 0);
else
mixer_ctl_get_array(ctl, ar->mixer_state[i].old_value.ptr, num_values);
memcpy(ar->mixer_state[i].new_value.ptr, ar->mixer_state[i].old_value.ptr,
num_values * value_sz);
}
return 0;
}
static void free_mixer_state(struct audio_route *ar)
{
unsigned int i;
enum mixer_ctl_type type;
for (i = 0; i < ar->num_mixer_ctls; i++) {
type = mixer_ctl_get_type(ar->mixer_state[i].ctl);
if (!is_supported_ctl_type(type))
continue;
free(ar->mixer_state[i].old_value.ptr);
free(ar->mixer_state[i].new_value.ptr);
free(ar->mixer_state[i].reset_value.ptr);
}
free(ar->mixer_state);
ar->mixer_state = NULL;
}
/* Update the mixer with any changed values */
int audio_route_update_mixer(struct audio_route *ar)
{
unsigned int i;
unsigned int j;
struct mixer_ctl *ctl;
for (i = 0; i < ar->num_mixer_ctls; i++) {
unsigned int num_values = ar->mixer_state[i].num_values;
enum mixer_ctl_type type;
ctl = ar->mixer_state[i].ctl;
/* Skip unsupported types */
type = mixer_ctl_get_type(ctl);
if (!is_supported_ctl_type(type))
continue;
/* if the value has changed, update the mixer */
bool changed = false;
if (type == MIXER_CTL_TYPE_BYTE) {
for (j = 0; j < num_values; j++) {
if (ar->mixer_state[i].old_value.bytes[j] != ar->mixer_state[i].new_value.bytes[j]) {
changed = true;
break;
}
}
} else if (type == MIXER_CTL_TYPE_ENUM) {
for (j = 0; j < num_values; j++) {
if (ar->mixer_state[i].old_value.enumerated[j]
!= ar->mixer_state[i].new_value.enumerated[j]) {
changed = true;
break;
}
}
} else {
for (j = 0; j < num_values; j++) {
if (ar->mixer_state[i].old_value.integer[j] != ar->mixer_state[i].new_value.integer[j]) {
changed = true;
break;
}
}
}
if (changed) {
if (type == MIXER_CTL_TYPE_ENUM)
mixer_ctl_set_value(ctl, 0, ar->mixer_state[i].new_value.enumerated[0]);
else
mixer_ctl_set_array(ctl, ar->mixer_state[i].new_value.ptr, num_values);
size_t value_sz = sizeof_ctl_type(type);
memcpy(ar->mixer_state[i].old_value.ptr, ar->mixer_state[i].new_value.ptr,
num_values * value_sz);
}
}
return 0;
}
/* saves the current state of the mixer, for resetting all controls */
static void save_mixer_state(struct audio_route *ar)
{
unsigned int i;
enum mixer_ctl_type type;
for (i = 0; i < ar->num_mixer_ctls; i++) {
type = mixer_ctl_get_type(ar->mixer_state[i].ctl);
if (!is_supported_ctl_type(type))
continue;
size_t value_sz = sizeof_ctl_type(type);
memcpy(ar->mixer_state[i].reset_value.ptr, ar->mixer_state[i].new_value.ptr,
ar->mixer_state[i].num_values * value_sz);
}
}
/* Reset the audio routes back to the initial state */
void audio_route_reset(struct audio_route *ar)
{
unsigned int i;
enum mixer_ctl_type type;
/* load all of the saved values */
for (i = 0; i < ar->num_mixer_ctls; i++) {
type = mixer_ctl_get_type(ar->mixer_state[i].ctl);
if (!is_supported_ctl_type(type))
continue;
size_t value_sz = sizeof_ctl_type(type);
memcpy(ar->mixer_state[i].new_value.ptr, ar->mixer_state[i].reset_value.ptr,
ar->mixer_state[i].num_values * value_sz);
}
}
/* Apply an audio route path by name */
int audio_route_apply_path(struct audio_route *ar, const char *name)
{
struct mixer_path *path;
if (!ar) {
ALOGE("invalid audio_route");
return -1;
}
path = path_get_by_name(ar, name);
if (!path) {
ALOGE("unable to find path '%s'", name);
return -1;
}
path_apply(ar, path);
return 0;
}
/* Reset an audio route path by name */
int audio_route_reset_path(struct audio_route *ar, const char *name)
{
struct mixer_path *path;
if (!ar) {
ALOGE("invalid audio_route");
return -1;
}
path = path_get_by_name(ar, name);
if (!path) {
ALOGE("unable to find path '%s'", name);
return -1;
}
path_reset(ar, path);
return 0;
}
/*
* Operates on the specified path .. controls will be updated in the
* order listed in the XML file
*/
static int audio_route_update_path(struct audio_route *ar, const char *name, bool reverse)
{
struct mixer_path *path;
int32_t i, end;
unsigned int j;
if (!ar) {
ALOGE("invalid audio_route");
return -1;
}
path = path_get_by_name(ar, name);
if (!path) {
ALOGE("unable to find path '%s'", name);
return -1;
}
i = reverse ? (path->length - 1) : 0;
end = reverse ? -1 : (int32_t)path->length;
while (i != end) {
unsigned int ctl_index;
enum mixer_ctl_type type;
ctl_index = path->setting[i].ctl_index;
struct mixer_state * ms = &ar->mixer_state[ctl_index];
type = mixer_ctl_get_type(ms->ctl);
if (!is_supported_ctl_type(type)) {
continue;
}
size_t value_sz = sizeof_ctl_type(type);
/* if any value has changed, update the mixer */
for (j = 0; j < ms->num_values; j++) {
if (type == MIXER_CTL_TYPE_BYTE) {
if (ms->old_value.bytes[j] != ms->new_value.bytes[j]) {
mixer_ctl_set_array(ms->ctl, ms->new_value.bytes, ms->num_values);
memcpy(ms->old_value.bytes, ms->new_value.bytes, ms->num_values * value_sz);
break;
}
} else if (type == MIXER_CTL_TYPE_ENUM) {
if (ms->old_value.enumerated[j] != ms->new_value.enumerated[j]) {
mixer_ctl_set_value(ms->ctl, 0, ms->new_value.enumerated[0]);
memcpy(ms->old_value.enumerated, ms->new_value.enumerated,
ms->num_values * value_sz);
break;
}
} else if (ms->old_value.integer[j] != ms->new_value.integer[j]) {
mixer_ctl_set_array(ms->ctl, ms->new_value.integer, ms->num_values);
memcpy(ms->old_value.integer, ms->new_value.integer, ms->num_values * value_sz);
break;
}
}
i = reverse ? (i - 1) : (i + 1);
}
return 0;
}
int audio_route_apply_and_update_path(struct audio_route *ar, const char *name)
{
if (audio_route_apply_path(ar, name) < 0) {
return -1;
}
return audio_route_update_path(ar, name, false /*reverse*/);
}
int audio_route_reset_and_update_path(struct audio_route *ar, const char *name)
{
if (audio_route_reset_path(ar, name) < 0) {
return -1;
}
return audio_route_update_path(ar, name, true /*reverse*/);
}
struct audio_route *audio_route_init(unsigned int card, const char *xml_path)
{
struct config_parse_state state;
XML_Parser parser;
FILE *file;
int bytes_read;
void *buf;
struct audio_route *ar;
ar = calloc(1, sizeof(struct audio_route));
if (!ar)
goto err_calloc;
ar->mixer = mixer_open(card);
if (!ar->mixer) {
ALOGE("Unable to open the mixer, aborting.");
goto err_mixer_open;
}
ar->mixer_path = NULL;
ar->mixer_path_size = 0;
ar->num_mixer_paths = 0;
/* allocate space for and read current mixer settings */
if (alloc_mixer_state(ar) < 0)
goto err_mixer_state;
/* use the default XML path if none is provided */
if (xml_path == NULL)
xml_path = MIXER_XML_PATH;
file = fopen(xml_path, "r");
if (!file) {
ALOGE("Failed to open %s", xml_path);
goto err_fopen;
}
parser = XML_ParserCreate(NULL);
if (!parser) {
ALOGE("Failed to create XML parser");
goto err_parser_create;
}
memset(&state, 0, sizeof(state));
state.ar = ar;
XML_SetUserData(parser, &state);
XML_SetElementHandler(parser, start_tag, end_tag);
for (;;) {
buf = XML_GetBuffer(parser, BUF_SIZE);
if (buf == NULL)
goto err_parse;
bytes_read = fread(buf, 1, BUF_SIZE, file);
if (bytes_read < 0)
goto err_parse;
if (XML_ParseBuffer(parser, bytes_read,
bytes_read == 0) == XML_STATUS_ERROR) {
ALOGE("Error in mixer xml (%s)", MIXER_XML_PATH);
goto err_parse;
}
if (bytes_read == 0)
break;
}
/* apply the initial mixer values, and save them so we can reset the
mixer to the original values */
audio_route_update_mixer(ar);
save_mixer_state(ar);
XML_ParserFree(parser);
fclose(file);
return ar;
err_parse:
path_free(ar);
XML_ParserFree(parser);
err_parser_create:
fclose(file);
err_fopen:
free_mixer_state(ar);
err_mixer_state:
mixer_close(ar->mixer);
err_mixer_open:
free(ar);
ar = NULL;
err_calloc:
return NULL;
}
void audio_route_free(struct audio_route *ar)
{
free_mixer_state(ar);
mixer_close(ar->mixer);
path_free(ar);
free(ar);
}