summaryrefslogtreecommitdiffstats
path: root/services/audiopolicy/service/AudioPolicyEffects.cpp
blob: 282ddebcfb5844bd52c43fb79bcc5b468177c013 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * 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 "AudioPolicyEffects"
//#define LOG_NDEBUG 0

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <cutils/misc.h>
#include <media/AudioEffect.h>
#include <system/audio.h>
#include <hardware/audio_effect.h>
#include <audio_effects/audio_effects_conf.h>
#include <utils/Vector.h>
#include <utils/SortedVector.h>
#include <cutils/config_utils.h>
#include "AudioPolicyEffects.h"
#include "ServiceUtilities.h"

namespace android {

// ----------------------------------------------------------------------------
// AudioPolicyEffects Implementation
// ----------------------------------------------------------------------------

AudioPolicyEffects::AudioPolicyEffects()
{
    // load automatic audio effect modules
    if (access(AUDIO_EFFECT_VENDOR_CONFIG_FILE, R_OK) == 0) {
        loadAudioEffectConfig(AUDIO_EFFECT_VENDOR_CONFIG_FILE);
    } else if (access(AUDIO_EFFECT_DEFAULT_CONFIG_FILE, R_OK) == 0) {
        loadAudioEffectConfig(AUDIO_EFFECT_DEFAULT_CONFIG_FILE);
    }
}


AudioPolicyEffects::~AudioPolicyEffects()
{
    size_t i = 0;
    // release audio input processing resources
    for (i = 0; i < mInputSources.size(); i++) {
        delete mInputSources.valueAt(i);
    }
    mInputSources.clear();

    for (i = 0; i < mInputs.size(); i++) {
        mInputs.valueAt(i)->mEffects.clear();
        delete mInputs.valueAt(i);
    }
    mInputs.clear();

    // release audio output processing resources
    for (i = 0; i < mOutputStreams.size(); i++) {
        delete mOutputStreams.valueAt(i);
    }
    mOutputStreams.clear();

    for (i = 0; i < mOutputSessions.size(); i++) {
        mOutputSessions.valueAt(i)->mEffects.clear();
        delete mOutputSessions.valueAt(i);
    }
    mOutputSessions.clear();
}


status_t AudioPolicyEffects::addInputEffects(audio_io_handle_t input,
                             audio_source_t inputSource,
                             int audioSession)
{
    status_t status = NO_ERROR;

    // create audio pre processors according to input source
    audio_source_t aliasSource = (inputSource == AUDIO_SOURCE_HOTWORD) ?
                                    AUDIO_SOURCE_VOICE_RECOGNITION : inputSource;

    Mutex::Autolock _l(mLock);
    ssize_t index = mInputSources.indexOfKey(aliasSource);
    if (index < 0) {
        ALOGV("addInputEffects(): no processing needs to be attached to this source");
        return status;
    }
    ssize_t idx = mInputs.indexOfKey(input);
    EffectVector *inputDesc;
    if (idx < 0) {
        inputDesc = new EffectVector(audioSession);
        mInputs.add(input, inputDesc);
    } else {
        // EffectVector is existing and we just need to increase ref count
        inputDesc = mInputs.valueAt(idx);
    }
    inputDesc->mRefCount++;

    ALOGV("addInputEffects(): input: %d, refCount: %d", input, inputDesc->mRefCount);
    if (inputDesc->mRefCount == 1) {
        Vector <EffectDesc *> effects = mInputSources.valueAt(index)->mEffects;
        for (size_t i = 0; i < effects.size(); i++) {
            EffectDesc *effect = effects[i];
            sp<AudioEffect> fx = new AudioEffect(NULL, String16("android"), &effect->mUuid, -1, 0,
                                                 0, audioSession, input);
            status_t status = fx->initCheck();
            if (status != NO_ERROR && status != ALREADY_EXISTS) {
                ALOGW("addInputEffects(): failed to create Fx %s on source %d",
                      effect->mName, (int32_t)aliasSource);
                // fx goes out of scope and strong ref on AudioEffect is released
                continue;
            }
            for (size_t j = 0; j < effect->mParams.size(); j++) {
                fx->setParameter(effect->mParams[j]);
            }
            ALOGV("addInputEffects(): added Fx %s on source: %d",
                  effect->mName, (int32_t)aliasSource);
            inputDesc->mEffects.add(fx);
        }
        inputDesc->setProcessorEnabled(true);
    }
    return status;
}


status_t AudioPolicyEffects::releaseInputEffects(audio_io_handle_t input)
{
    status_t status = NO_ERROR;

    Mutex::Autolock _l(mLock);
    ssize_t index = mInputs.indexOfKey(input);
    if (index < 0) {
        return status;
    }
    EffectVector *inputDesc = mInputs.valueAt(index);
    inputDesc->mRefCount--;
    ALOGV("releaseInputEffects(): input: %d, refCount: %d", input, inputDesc->mRefCount);
    if (inputDesc->mRefCount == 0) {
        inputDesc->setProcessorEnabled(false);
        delete inputDesc;
        mInputs.removeItemsAt(index);
        ALOGV("releaseInputEffects(): all effects released");
    }
    return status;
}

status_t AudioPolicyEffects::queryDefaultInputEffects(int audioSession,
                                                      effect_descriptor_t *descriptors,
                                                      uint32_t *count)
{
    status_t status = NO_ERROR;

    Mutex::Autolock _l(mLock);
    size_t index;
    for (index = 0; index < mInputs.size(); index++) {
        if (mInputs.valueAt(index)->mSessionId == audioSession) {
            break;
        }
    }
    if (index == mInputs.size()) {
        *count = 0;
        return BAD_VALUE;
    }
    Vector< sp<AudioEffect> > effects = mInputs.valueAt(index)->mEffects;

    for (size_t i = 0; i < effects.size(); i++) {
        effect_descriptor_t desc = effects[i]->descriptor();
        if (i < *count) {
            descriptors[i] = desc;
        }
    }
    if (effects.size() > *count) {
        status = NO_MEMORY;
    }
    *count = effects.size();
    return status;
}


status_t AudioPolicyEffects::queryDefaultOutputSessionEffects(int audioSession,
                         effect_descriptor_t *descriptors,
                         uint32_t *count)
{
    status_t status = NO_ERROR;

    Mutex::Autolock _l(mLock);
    size_t index;
    for (index = 0; index < mOutputSessions.size(); index++) {
        if (mOutputSessions.valueAt(index)->mSessionId == audioSession) {
            break;
        }
    }
    if (index == mOutputSessions.size()) {
        *count = 0;
        return BAD_VALUE;
    }
    Vector< sp<AudioEffect> > effects = mOutputSessions.valueAt(index)->mEffects;

    for (size_t i = 0; i < effects.size(); i++) {
        effect_descriptor_t desc = effects[i]->descriptor();
        if (i < *count) {
            descriptors[i] = desc;
        }
    }
    if (effects.size() > *count) {
        status = NO_MEMORY;
    }
    *count = effects.size();
    return status;
}


status_t AudioPolicyEffects::addOutputSessionEffects(audio_io_handle_t output,
                         audio_stream_type_t stream,
                         int audioSession)
{
    status_t status = NO_ERROR;

    Mutex::Autolock _l(mLock);
    // create audio processors according to stream
    // FIXME: should we have specific post processing settings for internal streams?
    // default to media for now.
    if (stream >= AUDIO_STREAM_PUBLIC_CNT) {
        stream = AUDIO_STREAM_MUSIC;
    }
    ssize_t index = mOutputStreams.indexOfKey(stream);
    if (index < 0) {
        ALOGV("addOutputSessionEffects(): no output processing needed for this stream");
        return NO_ERROR;
    }

    ssize_t idx = mOutputSessions.indexOfKey(audioSession);
    EffectVector *procDesc;
    if (idx < 0) {
        procDesc = new EffectVector(audioSession);
        mOutputSessions.add(audioSession, procDesc);
    } else {
        // EffectVector is existing and we just need to increase ref count
        procDesc = mOutputSessions.valueAt(idx);
    }
    procDesc->mRefCount++;

    ALOGV("addOutputSessionEffects(): session: %d, refCount: %d",
          audioSession, procDesc->mRefCount);
    if (procDesc->mRefCount == 1) {
        Vector <EffectDesc *> effects = mOutputStreams.valueAt(index)->mEffects;
        for (size_t i = 0; i < effects.size(); i++) {
            EffectDesc *effect = effects[i];
            sp<AudioEffect> fx = new AudioEffect(NULL, String16("android"), &effect->mUuid, 0, 0, 0,
                                                 audioSession, output);
            status_t status = fx->initCheck();
            if (status != NO_ERROR && status != ALREADY_EXISTS) {
                ALOGE("addOutputSessionEffects(): failed to create Fx  %s on session %d",
                      effect->mName, audioSession);
                // fx goes out of scope and strong ref on AudioEffect is released
                continue;
            }
            ALOGV("addOutputSessionEffects(): added Fx %s on session: %d for stream: %d",
                  effect->mName, audioSession, (int32_t)stream);
            procDesc->mEffects.add(fx);
        }

        procDesc->setProcessorEnabled(true);
    }
    return status;
}

status_t AudioPolicyEffects::releaseOutputSessionEffects(audio_io_handle_t output,
                         audio_stream_type_t stream,
                         int audioSession)
{
    status_t status = NO_ERROR;
    (void) output; // argument not used for now
    (void) stream; // argument not used for now

    Mutex::Autolock _l(mLock);
    ssize_t index = mOutputSessions.indexOfKey(audioSession);
    if (index < 0) {
        ALOGV("releaseOutputSessionEffects: no output processing was attached to this stream");
        return NO_ERROR;
    }

    EffectVector *procDesc = mOutputSessions.valueAt(index);
    procDesc->mRefCount--;
    ALOGV("releaseOutputSessionEffects(): session: %d, refCount: %d",
          audioSession, procDesc->mRefCount);
    if (procDesc->mRefCount == 0) {
        procDesc->setProcessorEnabled(false);
        procDesc->mEffects.clear();
        delete procDesc;
        mOutputSessions.removeItemsAt(index);
        ALOGV("releaseOutputSessionEffects(): output processing released from session: %d",
              audioSession);
    }
    return status;
}


void AudioPolicyEffects::EffectVector::setProcessorEnabled(bool enabled)
{
    for (size_t i = 0; i < mEffects.size(); i++) {
        mEffects.itemAt(i)->setEnabled(enabled);
    }
}


// ----------------------------------------------------------------------------
// Audio processing configuration
// ----------------------------------------------------------------------------

/*static*/ const char * const AudioPolicyEffects::kInputSourceNames[AUDIO_SOURCE_CNT -1] = {
    MIC_SRC_TAG,
    VOICE_UL_SRC_TAG,
    VOICE_DL_SRC_TAG,
    VOICE_CALL_SRC_TAG,
    CAMCORDER_SRC_TAG,
    VOICE_REC_SRC_TAG,
    VOICE_COMM_SRC_TAG
};

// returns the audio_source_t enum corresponding to the input source name or
// AUDIO_SOURCE_CNT is no match found
/*static*/ audio_source_t AudioPolicyEffects::inputSourceNameToEnum(const char *name)
{
    int i;
    for (i = AUDIO_SOURCE_MIC; i < AUDIO_SOURCE_CNT; i++) {
        if (strcmp(name, kInputSourceNames[i - AUDIO_SOURCE_MIC]) == 0) {
            ALOGV("inputSourceNameToEnum found source %s %d", name, i);
            break;
        }
    }
    return (audio_source_t)i;
}

const char *AudioPolicyEffects::kStreamNames[AUDIO_STREAM_PUBLIC_CNT+1] = {
    AUDIO_STREAM_DEFAULT_TAG,
    AUDIO_STREAM_VOICE_CALL_TAG,
    AUDIO_STREAM_SYSTEM_TAG,
    AUDIO_STREAM_RING_TAG,
    AUDIO_STREAM_MUSIC_TAG,
    AUDIO_STREAM_ALARM_TAG,
    AUDIO_STREAM_NOTIFICATION_TAG,
    AUDIO_STREAM_BLUETOOTH_SCO_TAG,
    AUDIO_STREAM_ENFORCED_AUDIBLE_TAG,
    AUDIO_STREAM_DTMF_TAG,
    AUDIO_STREAM_TTS_TAG
};

// returns the audio_stream_t enum corresponding to the output stream name or
// AUDIO_STREAM_PUBLIC_CNT is no match found
audio_stream_type_t AudioPolicyEffects::streamNameToEnum(const char *name)
{
    int i;
    for (i = AUDIO_STREAM_DEFAULT; i < AUDIO_STREAM_PUBLIC_CNT; i++) {
        if (strcmp(name, kStreamNames[i - AUDIO_STREAM_DEFAULT]) == 0) {
            ALOGV("streamNameToEnum found stream %s %d", name, i);
            break;
        }
    }
    return (audio_stream_type_t)i;
}

// ----------------------------------------------------------------------------
// Audio Effect Config parser
// ----------------------------------------------------------------------------

size_t AudioPolicyEffects::growParamSize(char *param,
                                         size_t size,
                                         size_t *curSize,
                                         size_t *totSize)
{
    // *curSize is at least sizeof(effect_param_t) + 2 * sizeof(int)
    size_t pos = ((*curSize - 1 ) / size + 1) * size;

    if (pos + size > *totSize) {
        while (pos + size > *totSize) {
            *totSize += ((*totSize + 7) / 8) * 4;
        }
        param = (char *)realloc(param, *totSize);
    }
    *curSize = pos + size;
    return pos;
}

size_t AudioPolicyEffects::readParamValue(cnode *node,
                                          char *param,
                                          size_t *curSize,
                                          size_t *totSize)
{
    if (strncmp(node->name, SHORT_TAG, sizeof(SHORT_TAG) + 1) == 0) {
        size_t pos = growParamSize(param, sizeof(short), curSize, totSize);
        *(short *)((char *)param + pos) = (short)atoi(node->value);
        ALOGV("readParamValue() reading short %d", *(short *)((char *)param + pos));
        return sizeof(short);
    } else if (strncmp(node->name, INT_TAG, sizeof(INT_TAG) + 1) == 0) {
        size_t pos = growParamSize(param, sizeof(int), curSize, totSize);
        *(int *)((char *)param + pos) = atoi(node->value);
        ALOGV("readParamValue() reading int %d", *(int *)((char *)param + pos));
        return sizeof(int);
    } else if (strncmp(node->name, FLOAT_TAG, sizeof(FLOAT_TAG) + 1) == 0) {
        size_t pos = growParamSize(param, sizeof(float), curSize, totSize);
        *(float *)((char *)param + pos) = (float)atof(node->value);
        ALOGV("readParamValue() reading float %f",*(float *)((char *)param + pos));
        return sizeof(float);
    } else if (strncmp(node->name, BOOL_TAG, sizeof(BOOL_TAG) + 1) == 0) {
        size_t pos = growParamSize(param, sizeof(bool), curSize, totSize);
        if (strncmp(node->value, "false", strlen("false") + 1) == 0) {
            *(bool *)((char *)param + pos) = false;
        } else {
            *(bool *)((char *)param + pos) = true;
        }
        ALOGV("readParamValue() reading bool %s",*(bool *)((char *)param + pos) ? "true" : "false");
        return sizeof(bool);
    } else if (strncmp(node->name, STRING_TAG, sizeof(STRING_TAG) + 1) == 0) {
        size_t len = strnlen(node->value, EFFECT_STRING_LEN_MAX);
        if (*curSize + len + 1 > *totSize) {
            *totSize = *curSize + len + 1;
            param = (char *)realloc(param, *totSize);
        }
        strncpy(param + *curSize, node->value, len);
        *curSize += len;
        param[*curSize] = '\0';
        ALOGV("readParamValue() reading string %s", param + *curSize - len);
        return len;
    }
    ALOGW("readParamValue() unknown param type %s", node->name);
    return 0;
}

effect_param_t *AudioPolicyEffects::loadEffectParameter(cnode *root)
{
    cnode *param;
    cnode *value;
    size_t curSize = sizeof(effect_param_t);
    size_t totSize = sizeof(effect_param_t) + 2 * sizeof(int);
    effect_param_t *fx_param = (effect_param_t *)malloc(totSize);

    param = config_find(root, PARAM_TAG);
    value = config_find(root, VALUE_TAG);
    if (param == NULL && value == NULL) {
        // try to parse simple parameter form {int int}
        param = root->first_child;
        if (param != NULL) {
            // Note: that a pair of random strings is read as 0 0
            int *ptr = (int *)fx_param->data;
            int *ptr2 = (int *)((char *)param + sizeof(effect_param_t));
            ALOGW("loadEffectParameter() ptr %p ptr2 %p", ptr, ptr2);
            *ptr++ = atoi(param->name);
            *ptr = atoi(param->value);
            fx_param->psize = sizeof(int);
            fx_param->vsize = sizeof(int);
            return fx_param;
        }
    }
    if (param == NULL || value == NULL) {
        ALOGW("loadEffectParameter() invalid parameter description %s", root->name);
        goto error;
    }

    fx_param->psize = 0;
    param = param->first_child;
    while (param) {
        ALOGV("loadEffectParameter() reading param of type %s", param->name);
        size_t size = readParamValue(param, (char *)fx_param, &curSize, &totSize);
        if (size == 0) {
            goto error;
        }
        fx_param->psize += size;
        param = param->next;
    }

    // align start of value field on 32 bit boundary
    curSize = ((curSize - 1 ) / sizeof(int) + 1) * sizeof(int);

    fx_param->vsize = 0;
    value = value->first_child;
    while (value) {
        ALOGV("loadEffectParameter() reading value of type %s", value->name);
        size_t size = readParamValue(value, (char *)fx_param, &curSize, &totSize);
        if (size == 0) {
            goto error;
        }
        fx_param->vsize += size;
        value = value->next;
    }

    return fx_param;

error:
    delete fx_param;
    return NULL;
}

void AudioPolicyEffects::loadEffectParameters(cnode *root, Vector <effect_param_t *>& params)
{
    cnode *node = root->first_child;
    while (node) {
        ALOGV("loadEffectParameters() loading param %s", node->name);
        effect_param_t *param = loadEffectParameter(node);
        if (param == NULL) {
            node = node->next;
            continue;
        }
        params.add(param);
        node = node->next;
    }
}


AudioPolicyEffects::EffectDescVector *AudioPolicyEffects::loadEffectConfig(
                                                            cnode *root,
                                                            const Vector <EffectDesc *>& effects)
{
    cnode *node = root->first_child;
    if (node == NULL) {
        ALOGW("loadInputSource() empty element %s", root->name);
        return NULL;
    }
    EffectDescVector *desc = new EffectDescVector();
    while (node) {
        size_t i;
        for (i = 0; i < effects.size(); i++) {
            if (strncmp(effects[i]->mName, node->name, EFFECT_STRING_LEN_MAX) == 0) {
                ALOGV("loadEffectConfig() found effect %s in list", node->name);
                break;
            }
        }
        if (i == effects.size()) {
            ALOGV("loadEffectConfig() effect %s not in list", node->name);
            node = node->next;
            continue;
        }
        EffectDesc *effect = new EffectDesc(*effects[i]);   // deep copy
        loadEffectParameters(node, effect->mParams);
        ALOGV("loadEffectConfig() adding effect %s uuid %08x",
              effect->mName, effect->mUuid.timeLow);
        desc->mEffects.add(effect);
        node = node->next;
    }
    if (desc->mEffects.size() == 0) {
        ALOGW("loadEffectConfig() no valid effects found in config %s", root->name);
        delete desc;
        return NULL;
    }
    return desc;
}

status_t AudioPolicyEffects::loadInputEffectConfigurations(cnode *root,
                                                           const Vector <EffectDesc *>& effects)
{
    cnode *node = config_find(root, PREPROCESSING_TAG);
    if (node == NULL) {
        return -ENOENT;
    }
    node = node->first_child;
    while (node) {
        audio_source_t source = inputSourceNameToEnum(node->name);
        if (source == AUDIO_SOURCE_CNT) {
            ALOGW("loadInputSources() invalid input source %s", node->name);
            node = node->next;
            continue;
        }
        ALOGV("loadInputSources() loading input source %s", node->name);
        EffectDescVector *desc = loadEffectConfig(node, effects);
        if (desc == NULL) {
            node = node->next;
            continue;
        }
        mInputSources.add(source, desc);
        node = node->next;
    }
    return NO_ERROR;
}

status_t AudioPolicyEffects::loadStreamEffectConfigurations(cnode *root,
                                                            const Vector <EffectDesc *>& effects)
{
    cnode *node = config_find(root, OUTPUT_SESSION_PROCESSING_TAG);
    if (node == NULL) {
        return -ENOENT;
    }
    node = node->first_child;
    while (node) {
        audio_stream_type_t stream = streamNameToEnum(node->name);
        if (stream == AUDIO_STREAM_PUBLIC_CNT) {
            ALOGW("loadStreamEffectConfigurations() invalid output stream %s", node->name);
            node = node->next;
            continue;
        }
        ALOGV("loadStreamEffectConfigurations() loading output stream %s", node->name);
        EffectDescVector *desc = loadEffectConfig(node, effects);
        if (desc == NULL) {
            node = node->next;
            continue;
        }
        mOutputStreams.add(stream, desc);
        node = node->next;
    }
    return NO_ERROR;
}

AudioPolicyEffects::EffectDesc *AudioPolicyEffects::loadEffect(cnode *root)
{
    cnode *node = config_find(root, UUID_TAG);
    if (node == NULL) {
        return NULL;
    }
    effect_uuid_t uuid;
    if (AudioEffect::stringToGuid(node->value, &uuid) != NO_ERROR) {
        ALOGW("loadEffect() invalid uuid %s", node->value);
        return NULL;
    }
    return new EffectDesc(root->name, uuid);
}

status_t AudioPolicyEffects::loadEffects(cnode *root, Vector <EffectDesc *>& effects)
{
    cnode *node = config_find(root, EFFECTS_TAG);
    if (node == NULL) {
        return -ENOENT;
    }
    node = node->first_child;
    while (node) {
        ALOGV("loadEffects() loading effect %s", node->name);
        EffectDesc *effect = loadEffect(node);
        if (effect == NULL) {
            node = node->next;
            continue;
        }
        effects.add(effect);
        node = node->next;
    }
    return NO_ERROR;
}

status_t AudioPolicyEffects::loadAudioEffectConfig(const char *path)
{
    cnode *root;
    char *data;

    data = (char *)load_file(path, NULL);
    if (data == NULL) {
        return -ENODEV;
    }
    root = config_node("", "");
    config_load(root, data);

    Vector <EffectDesc *> effects;
    loadEffects(root, effects);
    loadInputEffectConfigurations(root, effects);
    loadStreamEffectConfigurations(root, effects);

    for (size_t i = 0; i < effects.size(); i++) {
        delete effects[i];
    }

    config_free(root);
    free(root);
    free(data);

    return NO_ERROR;
}


}; // namespace android