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 if (ar->mixer_path[i].name)
157 free(ar->mixer_path[i].name);
158 if (ar->mixer_path[i].setting) {
159 if (ar->mixer_path[i].setting->value.ptr)
160 free(ar->mixer_path[i].setting->value.ptr);
161 free(ar->mixer_path[i].setting);
164 free(ar->mixer_path);
165 ar->mixer_path = NULL;
166 ar->mixer_path_size = 0;
169 static struct mixer_path *path_get_by_name(struct audio_route *ar,
174 for (i = 0; i < ar->num_mixer_paths; i++)
175 if (strcmp(ar->mixer_path[i].name, name) == 0)
176 return &ar->mixer_path[i];
181 static struct mixer_path *path_create(struct audio_route *ar, const char *name)
183 struct mixer_path *new_mixer_path = NULL;
185 if (path_get_by_name(ar, name)) {
186 ALOGE("Path name '%s' already exists", name);
190 /* check if we need to allocate more space for mixer paths */
191 if (ar->mixer_path_size <= ar->num_mixer_paths) {
192 if (ar->mixer_path_size == 0)
193 ar->mixer_path_size = INITIAL_MIXER_PATH_SIZE;
195 ar->mixer_path_size *= 2;
197 new_mixer_path = realloc(ar->mixer_path, ar->mixer_path_size *
198 sizeof(struct mixer_path));
199 if (new_mixer_path == NULL) {
200 ALOGE("Unable to allocate more paths");
203 ar->mixer_path = new_mixer_path;
207 /* initialise the new mixer path */
208 ar->mixer_path[ar->num_mixer_paths].name = strdup(name);
209 ar->mixer_path[ar->num_mixer_paths].size = 0;
210 ar->mixer_path[ar->num_mixer_paths].length = 0;
211 ar->mixer_path[ar->num_mixer_paths].setting = NULL;
213 /* return the mixer path just added, then increment number of them */
214 return &ar->mixer_path[ar->num_mixer_paths++];
217 static int find_ctl_index_in_path(struct mixer_path *path,
218 unsigned int ctl_index)
222 for (i = 0; i < path->length; i++)
223 if (path->setting[i].ctl_index == ctl_index)
229 static int alloc_path_setting(struct mixer_path *path)
231 struct mixer_setting *new_path_setting;
234 /* check if we need to allocate more space for path settings */
235 if (path->size <= path->length) {
237 path->size = INITIAL_MIXER_PATH_SIZE;
241 new_path_setting = realloc(path->setting,
242 path->size * sizeof(struct mixer_setting));
243 if (new_path_setting == NULL) {
244 ALOGE("Unable to allocate more path settings");
247 path->setting = new_path_setting;
251 path_index = path->length;
257 static int path_add_setting(struct audio_route *ar, struct mixer_path *path,
258 struct mixer_setting *setting)
262 if (find_ctl_index_in_path(path, setting->ctl_index) != -1) {
263 struct mixer_ctl *ctl = index_to_ctl(ar, setting->ctl_index);
265 ALOGE("Control '%s' already exists in path '%s'",
266 mixer_ctl_get_name(ctl), path->name);
270 if (!is_supported_ctl_type(setting->type)) {
271 ALOGE("unsupported type %d", (int)setting->type);
275 path_index = alloc_path_setting(path);
279 path->setting[path_index].ctl_index = setting->ctl_index;
280 path->setting[path_index].type = setting->type;
281 path->setting[path_index].num_values = setting->num_values;
283 size_t value_sz = sizeof_ctl_type(setting->type);
285 path->setting[path_index].value.ptr = calloc(setting->num_values, value_sz);
286 /* copy all values */
287 memcpy(path->setting[path_index].value.ptr, setting->value.ptr,
288 setting->num_values * value_sz);
293 static int path_add_value(struct audio_route *ar, struct mixer_path *path,
294 struct mixer_value *mixer_value)
298 unsigned int num_values;
299 struct mixer_ctl *ctl;
301 /* Check that mixer value index is within range */
302 ctl = index_to_ctl(ar, mixer_value->ctl_index);
303 num_values = mixer_ctl_get_num_values(ctl);
304 if (mixer_value->index >= (int)num_values) {
305 ALOGE("mixer index %d is out of range for '%s'", mixer_value->index,
306 mixer_ctl_get_name(ctl));
310 path_index = find_ctl_index_in_path(path, mixer_value->ctl_index);
311 if (path_index < 0) {
314 enum mixer_ctl_type type = mixer_ctl_get_type(ctl);
315 if (!is_supported_ctl_type(type)) {
316 ALOGE("unsupported type %d", (int)type);
319 path_index = alloc_path_setting(path);
323 /* initialise the new path setting */
324 path->setting[path_index].ctl_index = mixer_value->ctl_index;
325 path->setting[path_index].num_values = num_values;
326 path->setting[path_index].type = type;
328 size_t value_sz = sizeof_ctl_type(type);
329 path->setting[path_index].value.ptr = calloc(num_values, value_sz);
330 if (path->setting[path_index].type == MIXER_CTL_TYPE_BYTE)
331 path->setting[path_index].value.bytes[0] = mixer_value->value;
332 else if (path->setting[path_index].type == MIXER_CTL_TYPE_ENUM)
333 path->setting[path_index].value.enumerated[0] = mixer_value->value;
335 path->setting[path_index].value.integer[0] = mixer_value->value;
338 if (mixer_value->index == -1) {
339 /* set all values the same */
340 if (path->setting[path_index].type == MIXER_CTL_TYPE_BYTE) {
341 for (i = 0; i < num_values; i++)
342 path->setting[path_index].value.bytes[i] = mixer_value->value;
343 } else if (path->setting[path_index].type == MIXER_CTL_TYPE_ENUM) {
344 for (i = 0; i < num_values; i++)
345 path->setting[path_index].value.enumerated[i] = mixer_value->value;
347 for (i = 0; i < num_values; i++)
348 path->setting[path_index].value.integer[i] = mixer_value->value;
351 /* set only one value */
352 if (path->setting[path_index].type == MIXER_CTL_TYPE_BYTE)
353 path->setting[path_index].value.bytes[mixer_value->index] = mixer_value->value;
354 else if (path->setting[path_index].type == MIXER_CTL_TYPE_ENUM)
355 path->setting[path_index].value.enumerated[mixer_value->index] = mixer_value->value;
357 path->setting[path_index].value.integer[mixer_value->index] = mixer_value->value;
363 static int path_add_path(struct audio_route *ar, struct mixer_path *path,
364 struct mixer_path *sub_path)
368 for (i = 0; i < sub_path->length; i++)
369 if (path_add_setting(ar, path, &sub_path->setting[i]) < 0)
375 static int path_apply(struct audio_route *ar, struct mixer_path *path)
378 unsigned int ctl_index;
379 struct mixer_ctl *ctl;
380 enum mixer_ctl_type type;
382 for (i = 0; i < path->length; i++) {
383 ctl_index = path->setting[i].ctl_index;
384 ctl = index_to_ctl(ar, ctl_index);
385 type = mixer_ctl_get_type(ctl);
386 if (!is_supported_ctl_type(type))
388 size_t value_sz = sizeof_ctl_type(type);
389 memcpy(ar->mixer_state[ctl_index].new_value.ptr, path->setting[i].value.ptr,
390 path->setting[i].num_values * value_sz);
396 static int path_reset(struct audio_route *ar, struct mixer_path *path)
399 unsigned int ctl_index;
400 struct mixer_ctl *ctl;
401 enum mixer_ctl_type type;
403 for (i = 0; i < path->length; i++) {
404 ctl_index = path->setting[i].ctl_index;
405 ctl = index_to_ctl(ar, ctl_index);
406 type = mixer_ctl_get_type(ctl);
407 if (!is_supported_ctl_type(type))
409 size_t value_sz = sizeof_ctl_type(type);
410 /* reset the value(s) */
411 memcpy(ar->mixer_state[ctl_index].new_value.ptr,
412 ar->mixer_state[ctl_index].reset_value.ptr,
413 ar->mixer_state[ctl_index].num_values * value_sz);
419 /* mixer helper function */
420 static int mixer_enum_string_to_value(struct mixer_ctl *ctl, const char *string)
423 unsigned int num_values = mixer_ctl_get_num_enums(ctl);
425 if (string == NULL) {
426 ALOGE("NULL enum value string passed to mixer_enum_string_to_value() for ctl %s",
427 mixer_ctl_get_name(ctl));
431 /* Search the enum strings for a particular one */
432 for (i = 0; i < num_values; i++) {
433 if (strcmp(mixer_ctl_get_enum_string(ctl, i), string) == 0)
436 if (i == num_values) {
437 ALOGE("unknown enum value string %s for ctl %s",
438 string, mixer_ctl_get_name(ctl));
444 static void start_tag(void *data, const XML_Char *tag_name,
445 const XML_Char **attr)
447 const XML_Char *attr_name = NULL;
448 const XML_Char *attr_id = NULL;
449 const XML_Char *attr_value = NULL;
450 struct config_parse_state *state = data;
451 struct audio_route *ar = state->ar;
453 unsigned int ctl_index;
454 struct mixer_ctl *ctl;
457 struct mixer_value mixer_value;
458 enum mixer_ctl_type type;
460 /* Get name, id and value attributes (these may be empty) */
461 for (i = 0; attr[i]; i += 2) {
462 if (strcmp(attr[i], "name") == 0)
463 attr_name = attr[i + 1];
464 if (strcmp(attr[i], "id") == 0)
465 attr_id = attr[i + 1];
466 else if (strcmp(attr[i], "value") == 0)
467 attr_value = attr[i + 1];
471 if (strcmp(tag_name, "path") == 0) {
472 if (attr_name == NULL) {
473 ALOGE("Unnamed path!");
475 if (state->level == 1) {
476 /* top level path: create and stash the path */
477 state->path = path_create(ar, (char *)attr_name);
480 struct mixer_path *sub_path = path_get_by_name(ar, attr_name);
481 path_add_path(ar, state->path, sub_path);
486 else if (strcmp(tag_name, "ctl") == 0) {
487 /* Obtain the mixer ctl and value */
488 ctl = mixer_get_ctl_by_name(ar->mixer, attr_name);
490 ALOGE("Control '%s' doesn't exist - skipping", attr_name);
494 switch (mixer_ctl_get_type(ctl)) {
495 case MIXER_CTL_TYPE_BOOL:
496 case MIXER_CTL_TYPE_INT:
497 value = strtol((char *)attr_value, NULL, 0);
499 case MIXER_CTL_TYPE_BYTE:
500 value = (unsigned char) strtol((char *)attr_value, NULL, 16);
502 case MIXER_CTL_TYPE_ENUM:
503 value = mixer_enum_string_to_value(ctl, (char *)attr_value);
510 /* locate the mixer ctl in the list */
511 for (ctl_index = 0; ctl_index < ar->num_mixer_ctls; ctl_index++) {
512 if (ar->mixer_state[ctl_index].ctl == ctl)
516 if (state->level == 1) {
517 /* top level ctl (initial setting) */
519 type = mixer_ctl_get_type(ctl);
520 if (is_supported_ctl_type(type)) {
521 /* apply the new value */
523 /* set only one value */
524 id = atoi((char *)attr_id);
525 if (id < ar->mixer_state[ctl_index].num_values)
526 if (type == MIXER_CTL_TYPE_BYTE)
527 ar->mixer_state[ctl_index].new_value.bytes[id] = value;
528 else if (type == MIXER_CTL_TYPE_ENUM)
529 ar->mixer_state[ctl_index].new_value.enumerated[id] = value;
531 ar->mixer_state[ctl_index].new_value.integer[id] = value;
533 ALOGE("value id out of range for mixer ctl '%s'",
534 mixer_ctl_get_name(ctl));
536 /* set all values the same */
537 for (i = 0; i < ar->mixer_state[ctl_index].num_values; i++)
538 if (type == MIXER_CTL_TYPE_BYTE)
539 ar->mixer_state[ctl_index].new_value.bytes[i] = value;
540 else if (type == MIXER_CTL_TYPE_ENUM)
541 ar->mixer_state[ctl_index].new_value.enumerated[i] = value;
543 ar->mixer_state[ctl_index].new_value.integer[i] = value;
547 /* nested ctl (within a path) */
548 mixer_value.ctl_index = ctl_index;
549 mixer_value.value = value;
551 mixer_value.index = atoi((char *)attr_id);
553 mixer_value.index = -1;
554 path_add_value(ar, state->path, &mixer_value);
562 static void end_tag(void *data, const XML_Char *tag_name)
564 struct config_parse_state *state = data;
570 static int alloc_mixer_state(struct audio_route *ar)
573 unsigned int num_values;
574 struct mixer_ctl *ctl;
575 enum mixer_ctl_type type;
577 ar->num_mixer_ctls = mixer_get_num_ctls(ar->mixer);
578 ar->mixer_state = calloc(ar->num_mixer_ctls, sizeof(struct mixer_state));
579 if (!ar->mixer_state)
582 for (i = 0; i < ar->num_mixer_ctls; i++) {
583 ctl = mixer_get_ctl(ar->mixer, i);
584 num_values = mixer_ctl_get_num_values(ctl);
586 ar->mixer_state[i].ctl = ctl;
587 ar->mixer_state[i].num_values = num_values;
589 /* Skip unsupported types that are not supported yet in XML */
590 type = mixer_ctl_get_type(ctl);
592 if (!is_supported_ctl_type(type))
595 size_t value_sz = sizeof_ctl_type(type);
596 ar->mixer_state[i].old_value.ptr = calloc(num_values, value_sz);
597 ar->mixer_state[i].new_value.ptr = calloc(num_values, value_sz);
598 ar->mixer_state[i].reset_value.ptr = calloc(num_values, value_sz);
600 if (type == MIXER_CTL_TYPE_ENUM)
601 ar->mixer_state[i].old_value.enumerated[0] = mixer_ctl_get_value(ctl, 0);
603 mixer_ctl_get_array(ctl, ar->mixer_state[i].old_value.ptr, num_values);
605 memcpy(ar->mixer_state[i].new_value.ptr, ar->mixer_state[i].old_value.ptr,
606 num_values * value_sz);
612 static void free_mixer_state(struct audio_route *ar)
615 enum mixer_ctl_type type;
617 for (i = 0; i < ar->num_mixer_ctls; i++) {
618 type = mixer_ctl_get_type(ar->mixer_state[i].ctl);
619 if (!is_supported_ctl_type(type))
622 free(ar->mixer_state[i].old_value.ptr);
623 free(ar->mixer_state[i].new_value.ptr);
624 free(ar->mixer_state[i].reset_value.ptr);
627 free(ar->mixer_state);
628 ar->mixer_state = NULL;
631 /* Update the mixer with any changed values */
632 int audio_route_update_mixer(struct audio_route *ar)
636 struct mixer_ctl *ctl;
638 for (i = 0; i < ar->num_mixer_ctls; i++) {
639 unsigned int num_values = ar->mixer_state[i].num_values;
640 enum mixer_ctl_type type;
642 ctl = ar->mixer_state[i].ctl;
644 /* Skip unsupported types */
645 type = mixer_ctl_get_type(ctl);
646 if (!is_supported_ctl_type(type))
649 /* if the value has changed, update the mixer */
650 bool changed = false;
651 if (type == MIXER_CTL_TYPE_BYTE) {
652 for (j = 0; j < num_values; j++) {
653 if (ar->mixer_state[i].old_value.bytes[j] != ar->mixer_state[i].new_value.bytes[j]) {
658 } else if (type == MIXER_CTL_TYPE_ENUM) {
659 for (j = 0; j < num_values; j++) {
660 if (ar->mixer_state[i].old_value.enumerated[j]
661 != ar->mixer_state[i].new_value.enumerated[j]) {
667 for (j = 0; j < num_values; j++) {
668 if (ar->mixer_state[i].old_value.integer[j] != ar->mixer_state[i].new_value.integer[j]) {
675 if (type == MIXER_CTL_TYPE_ENUM)
676 mixer_ctl_set_value(ctl, 0, ar->mixer_state[i].new_value.enumerated[0]);
678 mixer_ctl_set_array(ctl, ar->mixer_state[i].new_value.ptr, num_values);
680 size_t value_sz = sizeof_ctl_type(type);
681 memcpy(ar->mixer_state[i].old_value.ptr, ar->mixer_state[i].new_value.ptr,
682 num_values * value_sz);
689 /* saves the current state of the mixer, for resetting all controls */
690 static void save_mixer_state(struct audio_route *ar)
693 enum mixer_ctl_type type;
695 for (i = 0; i < ar->num_mixer_ctls; i++) {
696 type = mixer_ctl_get_type(ar->mixer_state[i].ctl);
697 if (!is_supported_ctl_type(type))
700 size_t value_sz = sizeof_ctl_type(type);
701 memcpy(ar->mixer_state[i].reset_value.ptr, ar->mixer_state[i].new_value.ptr,
702 ar->mixer_state[i].num_values * value_sz);
706 /* Reset the audio routes back to the initial state */
707 void audio_route_reset(struct audio_route *ar)
710 enum mixer_ctl_type type;
712 /* load all of the saved values */
713 for (i = 0; i < ar->num_mixer_ctls; i++) {
714 type = mixer_ctl_get_type(ar->mixer_state[i].ctl);
715 if (!is_supported_ctl_type(type))
718 size_t value_sz = sizeof_ctl_type(type);
719 memcpy(ar->mixer_state[i].new_value.ptr, ar->mixer_state[i].reset_value.ptr,
720 ar->mixer_state[i].num_values * value_sz);
724 /* Apply an audio route path by name */
725 int audio_route_apply_path(struct audio_route *ar, const char *name)
727 struct mixer_path *path;
730 ALOGE("invalid audio_route");
734 path = path_get_by_name(ar, name);
736 ALOGE("unable to find path '%s'", name);
740 path_apply(ar, path);
745 /* Reset an audio route path by name */
746 int audio_route_reset_path(struct audio_route *ar, const char *name)
748 struct mixer_path *path;
751 ALOGE("invalid audio_route");
755 path = path_get_by_name(ar, name);
757 ALOGE("unable to find path '%s'", name);
761 path_reset(ar, path);
767 * Operates on the specified path .. controls will be updated in the
768 * order listed in the XML file
770 static int audio_route_update_path(struct audio_route *ar, const char *name, bool reverse)
772 struct mixer_path *path;
777 ALOGE("invalid audio_route");
781 path = path_get_by_name(ar, name);
783 ALOGE("unable to find path '%s'", name);
787 i = reverse ? (path->length - 1) : 0;
788 end = reverse ? -1 : (int32_t)path->length;
791 unsigned int ctl_index;
792 enum mixer_ctl_type type;
794 ctl_index = path->setting[i].ctl_index;
796 struct mixer_state * ms = &ar->mixer_state[ctl_index];
798 type = mixer_ctl_get_type(ms->ctl);
799 if (!is_supported_ctl_type(type)) {
803 size_t value_sz = sizeof_ctl_type(type);
804 /* if any value has changed, update the mixer */
805 for (j = 0; j < ms->num_values; j++) {
806 if (type == MIXER_CTL_TYPE_BYTE) {
807 if (ms->old_value.bytes[j] != ms->new_value.bytes[j]) {
808 mixer_ctl_set_array(ms->ctl, ms->new_value.bytes, ms->num_values);
809 memcpy(ms->old_value.bytes, ms->new_value.bytes, ms->num_values * value_sz);
812 } else if (type == MIXER_CTL_TYPE_ENUM) {
813 if (ms->old_value.enumerated[j] != ms->new_value.enumerated[j]) {
814 mixer_ctl_set_value(ms->ctl, 0, ms->new_value.enumerated[0]);
815 memcpy(ms->old_value.enumerated, ms->new_value.enumerated,
816 ms->num_values * value_sz);
819 } else if (ms->old_value.integer[j] != ms->new_value.integer[j]) {
820 mixer_ctl_set_array(ms->ctl, ms->new_value.integer, ms->num_values);
821 memcpy(ms->old_value.integer, ms->new_value.integer, ms->num_values * value_sz);
826 i = reverse ? (i - 1) : (i + 1);
831 int audio_route_apply_and_update_path(struct audio_route *ar, const char *name)
833 if (audio_route_apply_path(ar, name) < 0) {
836 return audio_route_update_path(ar, name, false /*reverse*/);
839 int audio_route_reset_and_update_path(struct audio_route *ar, const char *name)
841 if (audio_route_reset_path(ar, name) < 0) {
844 return audio_route_update_path(ar, name, true /*reverse*/);
847 struct audio_route *audio_route_init(unsigned int card, const char *xml_path)
849 struct config_parse_state state;
854 struct audio_route *ar;
856 ar = calloc(1, sizeof(struct audio_route));
860 ar->mixer = mixer_open(card);
862 ALOGE("Unable to open the mixer, aborting.");
866 ar->mixer_path = NULL;
867 ar->mixer_path_size = 0;
868 ar->num_mixer_paths = 0;
870 /* allocate space for and read current mixer settings */
871 if (alloc_mixer_state(ar) < 0)
872 goto err_mixer_state;
874 /* use the default XML path if none is provided */
875 if (xml_path == NULL)
876 xml_path = MIXER_XML_PATH;
878 file = fopen(xml_path, "r");
881 ALOGE("Failed to open %s", xml_path);
885 parser = XML_ParserCreate(NULL);
887 ALOGE("Failed to create XML parser");
888 goto err_parser_create;
891 memset(&state, 0, sizeof(state));
893 XML_SetUserData(parser, &state);
894 XML_SetElementHandler(parser, start_tag, end_tag);
897 buf = XML_GetBuffer(parser, BUF_SIZE);
901 bytes_read = fread(buf, 1, BUF_SIZE, file);
905 if (XML_ParseBuffer(parser, bytes_read,
906 bytes_read == 0) == XML_STATUS_ERROR) {
907 ALOGE("Error in mixer xml (%s)", MIXER_XML_PATH);
915 /* apply the initial mixer values, and save them so we can reset the
916 mixer to the original values */
917 audio_route_update_mixer(ar);
918 save_mixer_state(ar);
920 XML_ParserFree(parser);
926 XML_ParserFree(parser);
930 free_mixer_state(ar);
932 mixer_close(ar->mixer);
940 void audio_route_free(struct audio_route *ar)
942 free_mixer_state(ar);
943 mixer_close(ar->mixer);