2 * Copyright (C) 2013 The Android Open Source Project
3 * Inspired by TinyHW, written by Mark Brown at Wolfson Micro
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
18 #define LOG_TAG "audio_route"
19 /*#define LOG_NDEBUG 0*/
29 #include <tinyalsa/asoundlib.h>
32 #define MIXER_XML_PATH "/system/etc/mixer_paths.xml"
33 #define INITIAL_MIXER_PATH_SIZE 8
43 struct mixer_ctl *ctl;
44 unsigned int num_values;
45 union ctl_values old_value;
46 union ctl_values new_value;
47 union ctl_values reset_value;
50 struct mixer_setting {
51 unsigned int ctl_index;
52 unsigned int num_values;
54 union ctl_values value;
58 unsigned int ctl_index;
67 struct mixer_setting *setting;
72 unsigned int num_mixer_ctls;
73 struct mixer_state *mixer_state;
75 unsigned int mixer_path_size;
76 unsigned int num_mixer_paths;
77 struct mixer_path *mixer_path;
80 struct config_parse_state {
81 struct audio_route *ar;
82 struct mixer_path *path;
88 static bool is_supported_ctl_type(enum mixer_ctl_type type)
91 case MIXER_CTL_TYPE_BOOL:
92 case MIXER_CTL_TYPE_INT:
93 case MIXER_CTL_TYPE_ENUM:
94 case MIXER_CTL_TYPE_BYTE:
101 /* as they match in alsa */
102 static size_t sizeof_ctl_type(enum mixer_ctl_type type) {
104 case MIXER_CTL_TYPE_BOOL:
105 case MIXER_CTL_TYPE_INT:
107 case MIXER_CTL_TYPE_ENUM:
109 case MIXER_CTL_TYPE_BYTE:
110 return sizeof(unsigned char);
111 case MIXER_CTL_TYPE_INT64:
112 case MIXER_CTL_TYPE_IEC958:
113 case MIXER_CTL_TYPE_UNKNOWN:
115 LOG_ALWAYS_FATAL("Unsupported mixer ctl type: %d, check type before calling", (int)type);
120 static inline struct mixer_ctl *index_to_ctl(struct audio_route *ar,
121 unsigned int ctl_index)
123 return ar->mixer_state[ctl_index].ctl;
127 static void path_print(struct audio_route *ar, struct mixer_path *path)
132 ALOGE("Path: %s, length: %d", path->name, path->length);
133 for (i = 0; i < path->length; i++) {
134 struct mixer_ctl *ctl = index_to_ctl(ar, path->setting[i].ctl_index);
136 ALOGE(" id=%d: ctl=%s", i, mixer_ctl_get_name(ctl));
137 if (mixer_ctl_get_type(ctl) == MIXER_CTL_TYPE_BYTE) {
138 for (j = 0; j < path->setting[i].num_values; j++)
139 ALOGE(" id=%d value=0x%02x", j, path->setting[i].value.bytes[j]);
140 } else if (mixer_ctl_get_type(ctl) == MIXER_CTL_TYPE_ENUM) {
141 for (j = 0; j < path->setting[i].num_values; j++)
142 ALOGE(" id=%d value=%d", j, path->setting[i].value.enumerated[j]);
144 for (j = 0; j < path->setting[i].num_values; j++)
145 ALOGE(" id=%d value=%ld", j, path->setting[i].value.integer[j]);
151 static void path_free(struct audio_route *ar)
155 for (i = 0; i < ar->num_mixer_paths; i++) {
156 free(ar->mixer_path[i].name);
157 if (ar->mixer_path[i].setting) {
159 for (j = 0; j < ar->mixer_path[i].length; j++) {
160 free(ar->mixer_path[i].setting[j].value.ptr);
162 free(ar->mixer_path[i].setting);
163 ar->mixer_path[i].size = 0;
164 ar->mixer_path[i].length = 0;
165 ar->mixer_path[i].setting = NULL;
168 free(ar->mixer_path);
169 ar->mixer_path = NULL;
170 ar->mixer_path_size = 0;
171 ar->num_mixer_paths = 0;
174 static struct mixer_path *path_get_by_name(struct audio_route *ar,
179 for (i = 0; i < ar->num_mixer_paths; i++)
180 if (strcmp(ar->mixer_path[i].name, name) == 0)
181 return &ar->mixer_path[i];
186 static struct mixer_path *path_create(struct audio_route *ar, const char *name)
188 struct mixer_path *new_mixer_path = NULL;
190 if (path_get_by_name(ar, name)) {
191 ALOGE("Path name '%s' already exists", name);
195 /* check if we need to allocate more space for mixer paths */
196 if (ar->mixer_path_size <= ar->num_mixer_paths) {
197 if (ar->mixer_path_size == 0)
198 ar->mixer_path_size = INITIAL_MIXER_PATH_SIZE;
200 ar->mixer_path_size *= 2;
202 new_mixer_path = realloc(ar->mixer_path, ar->mixer_path_size *
203 sizeof(struct mixer_path));
204 if (new_mixer_path == NULL) {
205 ALOGE("Unable to allocate more paths");
208 ar->mixer_path = new_mixer_path;
212 /* initialise the new mixer path */
213 ar->mixer_path[ar->num_mixer_paths].name = strdup(name);
214 ar->mixer_path[ar->num_mixer_paths].size = 0;
215 ar->mixer_path[ar->num_mixer_paths].length = 0;
216 ar->mixer_path[ar->num_mixer_paths].setting = NULL;
218 /* return the mixer path just added, then increment number of them */
219 return &ar->mixer_path[ar->num_mixer_paths++];
222 static int find_ctl_index_in_path(struct mixer_path *path,
223 unsigned int ctl_index)
227 for (i = 0; i < path->length; i++)
228 if (path->setting[i].ctl_index == ctl_index)
234 static int alloc_path_setting(struct mixer_path *path)
236 struct mixer_setting *new_path_setting;
239 /* check if we need to allocate more space for path settings */
240 if (path->size <= path->length) {
242 path->size = INITIAL_MIXER_PATH_SIZE;
246 new_path_setting = realloc(path->setting,
247 path->size * sizeof(struct mixer_setting));
248 if (new_path_setting == NULL) {
249 ALOGE("Unable to allocate more path settings");
252 path->setting = new_path_setting;
256 path_index = path->length;
262 static int path_add_setting(struct audio_route *ar, struct mixer_path *path,
263 struct mixer_setting *setting)
267 if (find_ctl_index_in_path(path, setting->ctl_index) != -1) {
268 struct mixer_ctl *ctl = index_to_ctl(ar, setting->ctl_index);
270 ALOGE("Control '%s' already exists in path '%s'",
271 mixer_ctl_get_name(ctl), path->name);
275 if (!is_supported_ctl_type(setting->type)) {
276 ALOGE("unsupported type %d", (int)setting->type);
280 path_index = alloc_path_setting(path);
284 path->setting[path_index].ctl_index = setting->ctl_index;
285 path->setting[path_index].type = setting->type;
286 path->setting[path_index].num_values = setting->num_values;
288 size_t value_sz = sizeof_ctl_type(setting->type);
290 path->setting[path_index].value.ptr = calloc(setting->num_values, value_sz);
291 /* copy all values */
292 memcpy(path->setting[path_index].value.ptr, setting->value.ptr,
293 setting->num_values * value_sz);
298 static int path_add_value(struct audio_route *ar, struct mixer_path *path,
299 struct mixer_value *mixer_value)
303 unsigned int num_values;
304 struct mixer_ctl *ctl;
306 /* Check that mixer value index is within range */
307 ctl = index_to_ctl(ar, mixer_value->ctl_index);
308 num_values = mixer_ctl_get_num_values(ctl);
309 if (mixer_value->index >= (int)num_values) {
310 ALOGE("mixer index %d is out of range for '%s'", mixer_value->index,
311 mixer_ctl_get_name(ctl));
315 path_index = find_ctl_index_in_path(path, mixer_value->ctl_index);
316 if (path_index < 0) {
319 enum mixer_ctl_type type = mixer_ctl_get_type(ctl);
320 if (!is_supported_ctl_type(type)) {
321 ALOGE("unsupported type %d", (int)type);
324 path_index = alloc_path_setting(path);
328 /* initialise the new path setting */
329 path->setting[path_index].ctl_index = mixer_value->ctl_index;
330 path->setting[path_index].num_values = num_values;
331 path->setting[path_index].type = type;
333 size_t value_sz = sizeof_ctl_type(type);
334 path->setting[path_index].value.ptr = calloc(num_values, value_sz);
335 if (path->setting[path_index].type == MIXER_CTL_TYPE_BYTE)
336 path->setting[path_index].value.bytes[0] = mixer_value->value;
337 else if (path->setting[path_index].type == MIXER_CTL_TYPE_ENUM)
338 path->setting[path_index].value.enumerated[0] = mixer_value->value;
340 path->setting[path_index].value.integer[0] = mixer_value->value;
343 if (mixer_value->index == -1) {
344 /* set all values the same */
345 if (path->setting[path_index].type == MIXER_CTL_TYPE_BYTE) {
346 for (i = 0; i < num_values; i++)
347 path->setting[path_index].value.bytes[i] = mixer_value->value;
348 } else if (path->setting[path_index].type == MIXER_CTL_TYPE_ENUM) {
349 for (i = 0; i < num_values; i++)
350 path->setting[path_index].value.enumerated[i] = mixer_value->value;
352 for (i = 0; i < num_values; i++)
353 path->setting[path_index].value.integer[i] = mixer_value->value;
356 /* set only one value */
357 if (path->setting[path_index].type == MIXER_CTL_TYPE_BYTE)
358 path->setting[path_index].value.bytes[mixer_value->index] = mixer_value->value;
359 else if (path->setting[path_index].type == MIXER_CTL_TYPE_ENUM)
360 path->setting[path_index].value.enumerated[mixer_value->index] = mixer_value->value;
362 path->setting[path_index].value.integer[mixer_value->index] = mixer_value->value;
368 static int path_add_path(struct audio_route *ar, struct mixer_path *path,
369 struct mixer_path *sub_path)
373 for (i = 0; i < sub_path->length; i++)
374 if (path_add_setting(ar, path, &sub_path->setting[i]) < 0)
380 static int path_apply(struct audio_route *ar, struct mixer_path *path)
383 unsigned int ctl_index;
384 struct mixer_ctl *ctl;
385 enum mixer_ctl_type type;
387 for (i = 0; i < path->length; i++) {
388 ctl_index = path->setting[i].ctl_index;
389 ctl = index_to_ctl(ar, ctl_index);
390 type = mixer_ctl_get_type(ctl);
391 if (!is_supported_ctl_type(type))
393 size_t value_sz = sizeof_ctl_type(type);
394 memcpy(ar->mixer_state[ctl_index].new_value.ptr, path->setting[i].value.ptr,
395 path->setting[i].num_values * value_sz);
401 static int path_reset(struct audio_route *ar, struct mixer_path *path)
404 unsigned int ctl_index;
405 struct mixer_ctl *ctl;
406 enum mixer_ctl_type type;
408 for (i = 0; i < path->length; i++) {
409 ctl_index = path->setting[i].ctl_index;
410 ctl = index_to_ctl(ar, ctl_index);
411 type = mixer_ctl_get_type(ctl);
412 if (!is_supported_ctl_type(type))
414 size_t value_sz = sizeof_ctl_type(type);
415 /* reset the value(s) */
416 memcpy(ar->mixer_state[ctl_index].new_value.ptr,
417 ar->mixer_state[ctl_index].reset_value.ptr,
418 ar->mixer_state[ctl_index].num_values * value_sz);
424 /* mixer helper function */
425 static int mixer_enum_string_to_value(struct mixer_ctl *ctl, const char *string)
428 unsigned int num_values = mixer_ctl_get_num_enums(ctl);
430 if (string == NULL) {
431 ALOGE("NULL enum value string passed to mixer_enum_string_to_value() for ctl %s",
432 mixer_ctl_get_name(ctl));
436 /* Search the enum strings for a particular one */
437 for (i = 0; i < num_values; i++) {
438 if (strcmp(mixer_ctl_get_enum_string(ctl, i), string) == 0)
441 if (i == num_values) {
442 ALOGE("unknown enum value string %s for ctl %s",
443 string, mixer_ctl_get_name(ctl));
449 static void start_tag(void *data, const XML_Char *tag_name,
450 const XML_Char **attr)
452 const XML_Char *attr_name = NULL;
453 const XML_Char *attr_id = NULL;
454 const XML_Char *attr_value = NULL;
455 struct config_parse_state *state = data;
456 struct audio_route *ar = state->ar;
458 unsigned int ctl_index;
459 struct mixer_ctl *ctl;
462 struct mixer_value mixer_value;
463 enum mixer_ctl_type type;
465 /* Get name, id and value attributes (these may be empty) */
466 for (i = 0; attr[i]; i += 2) {
467 if (strcmp(attr[i], "name") == 0)
468 attr_name = attr[i + 1];
469 if (strcmp(attr[i], "id") == 0)
470 attr_id = attr[i + 1];
471 else if (strcmp(attr[i], "value") == 0)
472 attr_value = attr[i + 1];
476 if (strcmp(tag_name, "path") == 0) {
477 if (attr_name == NULL) {
478 ALOGE("Unnamed path!");
480 if (state->level == 1) {
481 /* top level path: create and stash the path */
482 state->path = path_create(ar, (char *)attr_name);
483 if (state->path == NULL)
484 ALOGE("path created failed, please check the path if existed");
487 struct mixer_path *sub_path = path_get_by_name(ar, attr_name);
489 ALOGE("unable to find sub path '%s'", attr_name);
490 } else if (state->path != NULL) {
491 path_add_path(ar, state->path, sub_path);
497 else if (strcmp(tag_name, "ctl") == 0) {
498 /* Obtain the mixer ctl and value */
499 ctl = mixer_get_ctl_by_name(ar->mixer, attr_name);
501 ALOGE("Control '%s' doesn't exist - skipping", attr_name);
505 switch (mixer_ctl_get_type(ctl)) {
506 case MIXER_CTL_TYPE_BOOL:
507 case MIXER_CTL_TYPE_INT:
508 value = strtol((char *)attr_value, NULL, 0);
510 case MIXER_CTL_TYPE_BYTE:
511 value = (unsigned char) strtol((char *)attr_value, NULL, 16);
513 case MIXER_CTL_TYPE_ENUM:
514 value = mixer_enum_string_to_value(ctl, (char *)attr_value);
521 /* locate the mixer ctl in the list */
522 for (ctl_index = 0; ctl_index < ar->num_mixer_ctls; ctl_index++) {
523 if (ar->mixer_state[ctl_index].ctl == ctl)
527 if (state->level == 1) {
528 /* top level ctl (initial setting) */
530 type = mixer_ctl_get_type(ctl);
531 if (is_supported_ctl_type(type)) {
532 /* apply the new value */
534 /* set only one value */
535 id = atoi((char *)attr_id);
536 if (id < ar->mixer_state[ctl_index].num_values)
537 if (type == MIXER_CTL_TYPE_BYTE)
538 ar->mixer_state[ctl_index].new_value.bytes[id] = value;
539 else if (type == MIXER_CTL_TYPE_ENUM)
540 ar->mixer_state[ctl_index].new_value.enumerated[id] = value;
542 ar->mixer_state[ctl_index].new_value.integer[id] = value;
544 ALOGE("value id out of range for mixer ctl '%s'",
545 mixer_ctl_get_name(ctl));
547 /* set all values the same */
548 for (i = 0; i < ar->mixer_state[ctl_index].num_values; i++)
549 if (type == MIXER_CTL_TYPE_BYTE)
550 ar->mixer_state[ctl_index].new_value.bytes[i] = value;
551 else if (type == MIXER_CTL_TYPE_ENUM)
552 ar->mixer_state[ctl_index].new_value.enumerated[i] = value;
554 ar->mixer_state[ctl_index].new_value.integer[i] = value;
558 /* nested ctl (within a path) */
559 mixer_value.ctl_index = ctl_index;
560 mixer_value.value = value;
562 mixer_value.index = atoi((char *)attr_id);
564 mixer_value.index = -1;
565 if (state->path != NULL)
566 path_add_value(ar, state->path, &mixer_value);
574 static void end_tag(void *data, const XML_Char *tag_name)
576 struct config_parse_state *state = data;
582 static int alloc_mixer_state(struct audio_route *ar)
585 unsigned int num_values;
586 struct mixer_ctl *ctl;
587 enum mixer_ctl_type type;
589 ar->num_mixer_ctls = mixer_get_num_ctls(ar->mixer);
590 ar->mixer_state = calloc(ar->num_mixer_ctls, sizeof(struct mixer_state));
591 if (!ar->mixer_state)
594 for (i = 0; i < ar->num_mixer_ctls; i++) {
595 ctl = mixer_get_ctl(ar->mixer, i);
596 num_values = mixer_ctl_get_num_values(ctl);
598 ar->mixer_state[i].ctl = ctl;
599 ar->mixer_state[i].num_values = num_values;
601 /* Skip unsupported types that are not supported yet in XML */
602 type = mixer_ctl_get_type(ctl);
604 if (!is_supported_ctl_type(type))
607 size_t value_sz = sizeof_ctl_type(type);
608 ar->mixer_state[i].old_value.ptr = calloc(num_values, value_sz);
609 ar->mixer_state[i].new_value.ptr = calloc(num_values, value_sz);
610 ar->mixer_state[i].reset_value.ptr = calloc(num_values, value_sz);
612 if (type == MIXER_CTL_TYPE_ENUM)
613 ar->mixer_state[i].old_value.enumerated[0] = mixer_ctl_get_value(ctl, 0);
615 mixer_ctl_get_array(ctl, ar->mixer_state[i].old_value.ptr, num_values);
617 memcpy(ar->mixer_state[i].new_value.ptr, ar->mixer_state[i].old_value.ptr,
618 num_values * value_sz);
624 static void free_mixer_state(struct audio_route *ar)
627 enum mixer_ctl_type type;
629 for (i = 0; i < ar->num_mixer_ctls; i++) {
630 type = mixer_ctl_get_type(ar->mixer_state[i].ctl);
631 if (!is_supported_ctl_type(type))
634 free(ar->mixer_state[i].old_value.ptr);
635 free(ar->mixer_state[i].new_value.ptr);
636 free(ar->mixer_state[i].reset_value.ptr);
639 free(ar->mixer_state);
640 ar->mixer_state = NULL;
643 /* Update the mixer with any changed values */
644 int audio_route_update_mixer(struct audio_route *ar)
648 struct mixer_ctl *ctl;
650 for (i = 0; i < ar->num_mixer_ctls; i++) {
651 unsigned int num_values = ar->mixer_state[i].num_values;
652 enum mixer_ctl_type type;
654 ctl = ar->mixer_state[i].ctl;
656 /* Skip unsupported types */
657 type = mixer_ctl_get_type(ctl);
658 if (!is_supported_ctl_type(type))
661 /* if the value has changed, update the mixer */
662 bool changed = false;
663 if (type == MIXER_CTL_TYPE_BYTE) {
664 for (j = 0; j < num_values; j++) {
665 if (ar->mixer_state[i].old_value.bytes[j] != ar->mixer_state[i].new_value.bytes[j]) {
670 } else if (type == MIXER_CTL_TYPE_ENUM) {
671 for (j = 0; j < num_values; j++) {
672 if (ar->mixer_state[i].old_value.enumerated[j]
673 != ar->mixer_state[i].new_value.enumerated[j]) {
679 for (j = 0; j < num_values; j++) {
680 if (ar->mixer_state[i].old_value.integer[j] != ar->mixer_state[i].new_value.integer[j]) {
687 if (type == MIXER_CTL_TYPE_ENUM)
688 mixer_ctl_set_value(ctl, 0, ar->mixer_state[i].new_value.enumerated[0]);
690 mixer_ctl_set_array(ctl, ar->mixer_state[i].new_value.ptr, num_values);
692 size_t value_sz = sizeof_ctl_type(type);
693 memcpy(ar->mixer_state[i].old_value.ptr, ar->mixer_state[i].new_value.ptr,
694 num_values * value_sz);
701 /* saves the current state of the mixer, for resetting all controls */
702 static void save_mixer_state(struct audio_route *ar)
705 enum mixer_ctl_type type;
707 for (i = 0; i < ar->num_mixer_ctls; i++) {
708 type = mixer_ctl_get_type(ar->mixer_state[i].ctl);
709 if (!is_supported_ctl_type(type))
712 size_t value_sz = sizeof_ctl_type(type);
713 memcpy(ar->mixer_state[i].reset_value.ptr, ar->mixer_state[i].new_value.ptr,
714 ar->mixer_state[i].num_values * value_sz);
718 /* Reset the audio routes back to the initial state */
719 void audio_route_reset(struct audio_route *ar)
722 enum mixer_ctl_type type;
724 /* load all of the saved values */
725 for (i = 0; i < ar->num_mixer_ctls; i++) {
726 type = mixer_ctl_get_type(ar->mixer_state[i].ctl);
727 if (!is_supported_ctl_type(type))
730 size_t value_sz = sizeof_ctl_type(type);
731 memcpy(ar->mixer_state[i].new_value.ptr, ar->mixer_state[i].reset_value.ptr,
732 ar->mixer_state[i].num_values * value_sz);
736 /* Apply an audio route path by name */
737 int audio_route_apply_path(struct audio_route *ar, const char *name)
739 struct mixer_path *path;
742 ALOGE("invalid audio_route");
746 path = path_get_by_name(ar, name);
748 ALOGE("unable to find path '%s'", name);
752 path_apply(ar, path);
757 /* Reset an audio route path by name */
758 int audio_route_reset_path(struct audio_route *ar, const char *name)
760 struct mixer_path *path;
763 ALOGE("invalid audio_route");
767 path = path_get_by_name(ar, name);
769 ALOGE("unable to find path '%s'", name);
773 path_reset(ar, path);
779 * Operates on the specified path .. controls will be updated in the
780 * order listed in the XML file
782 static int audio_route_update_path(struct audio_route *ar, const char *name, bool reverse)
784 struct mixer_path *path;
789 ALOGE("invalid audio_route");
793 path = path_get_by_name(ar, name);
795 ALOGE("unable to find path '%s'", name);
799 i = reverse ? (path->length - 1) : 0;
800 end = reverse ? -1 : (int32_t)path->length;
803 unsigned int ctl_index;
804 enum mixer_ctl_type type;
806 ctl_index = path->setting[i].ctl_index;
808 struct mixer_state * ms = &ar->mixer_state[ctl_index];
810 type = mixer_ctl_get_type(ms->ctl);
811 if (!is_supported_ctl_type(type)) {
815 size_t value_sz = sizeof_ctl_type(type);
816 /* if any value has changed, update the mixer */
817 for (j = 0; j < ms->num_values; j++) {
818 if (type == MIXER_CTL_TYPE_BYTE) {
819 if (ms->old_value.bytes[j] != ms->new_value.bytes[j]) {
820 mixer_ctl_set_array(ms->ctl, ms->new_value.bytes, ms->num_values);
821 memcpy(ms->old_value.bytes, ms->new_value.bytes, ms->num_values * value_sz);
824 } else if (type == MIXER_CTL_TYPE_ENUM) {
825 if (ms->old_value.enumerated[j] != ms->new_value.enumerated[j]) {
826 mixer_ctl_set_value(ms->ctl, 0, ms->new_value.enumerated[0]);
827 memcpy(ms->old_value.enumerated, ms->new_value.enumerated,
828 ms->num_values * value_sz);
831 } else if (ms->old_value.integer[j] != ms->new_value.integer[j]) {
832 mixer_ctl_set_array(ms->ctl, ms->new_value.integer, ms->num_values);
833 memcpy(ms->old_value.integer, ms->new_value.integer, ms->num_values * value_sz);
838 i = reverse ? (i - 1) : (i + 1);
843 int audio_route_apply_and_update_path(struct audio_route *ar, const char *name)
845 if (audio_route_apply_path(ar, name) < 0) {
848 return audio_route_update_path(ar, name, false /*reverse*/);
851 int audio_route_reset_and_update_path(struct audio_route *ar, const char *name)
853 if (audio_route_reset_path(ar, name) < 0) {
856 return audio_route_update_path(ar, name, true /*reverse*/);
859 struct audio_route *audio_route_init(unsigned int card, const char *xml_path)
861 struct config_parse_state state;
866 struct audio_route *ar;
868 ar = calloc(1, sizeof(struct audio_route));
872 ar->mixer = mixer_open(card);
874 ALOGE("Unable to open the mixer, aborting.");
878 ar->mixer_path = NULL;
879 ar->mixer_path_size = 0;
880 ar->num_mixer_paths = 0;
882 /* allocate space for and read current mixer settings */
883 if (alloc_mixer_state(ar) < 0)
884 goto err_mixer_state;
886 /* use the default XML path if none is provided */
887 if (xml_path == NULL)
888 xml_path = MIXER_XML_PATH;
890 file = fopen(xml_path, "r");
893 ALOGE("Failed to open %s: %s", xml_path, strerror(errno));
897 parser = XML_ParserCreate(NULL);
899 ALOGE("Failed to create XML parser");
900 goto err_parser_create;
903 memset(&state, 0, sizeof(state));
905 XML_SetUserData(parser, &state);
906 XML_SetElementHandler(parser, start_tag, end_tag);
909 buf = XML_GetBuffer(parser, BUF_SIZE);
913 bytes_read = fread(buf, 1, BUF_SIZE, file);
917 if (XML_ParseBuffer(parser, bytes_read,
918 bytes_read == 0) == XML_STATUS_ERROR) {
919 ALOGE("Error in mixer xml (%s)", MIXER_XML_PATH);
927 /* apply the initial mixer values, and save them so we can reset the
928 mixer to the original values */
929 audio_route_update_mixer(ar);
930 save_mixer_state(ar);
932 XML_ParserFree(parser);
938 XML_ParserFree(parser);
942 free_mixer_state(ar);
944 mixer_close(ar->mixer);
952 void audio_route_free(struct audio_route *ar)
954 free_mixer_state(ar);
955 mixer_close(ar->mixer);