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      1 /*
      2  * Copyright (C) 2014 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 /* Acoustic Echo Cancellation implementation */
     18 #include "sles_allinclusive.h"
     19 
     20 #include <media/EffectsFactoryApi.h>
     21 
     22 #include <audio_effects/effect_aec.h>
     23 
     24 /**
     25  * returns true if this interface is not associated with an initialized AEC effect
     26  */
     27 static inline bool NO_ECHOCANCEL(IAndroidAcousticEchoCancellation* v) {
     28     return (v->mAECEffect == 0);
     29 }
     30 
     31 static SLresult IAndroidAcousticEchoCancellation_SetEnabled(SLAndroidAcousticEchoCancellationItf self,
     32                                                      SLboolean enabled)
     33 {
     34     SL_ENTER_INTERFACE
     35 
     36     IAndroidAcousticEchoCancellation *thiz = (IAndroidAcousticEchoCancellation *) self;
     37     interface_lock_exclusive(thiz);
     38     thiz->mEnabled = (SLboolean) enabled;
     39     if (NO_ECHOCANCEL(thiz)) {
     40         result = SL_RESULT_CONTROL_LOST;
     41     } else {
     42         android::status_t status = thiz->mAECEffect->setEnabled((bool) thiz->mEnabled);
     43         result = android_fx_statusToResult(status);
     44     }
     45     interface_unlock_exclusive(thiz);
     46 
     47     SL_LEAVE_INTERFACE
     48 }
     49 
     50 static SLresult IAndroidAcousticEchoCancellation_IsEnabled(SLAndroidAcousticEchoCancellationItf self,
     51                                                     SLboolean *pEnabled)
     52 {
     53     SL_ENTER_INTERFACE
     54 
     55     if (NULL == pEnabled) {
     56         result = SL_RESULT_PARAMETER_INVALID;
     57     } else {
     58         IAndroidAcousticEchoCancellation *thiz = (IAndroidAcousticEchoCancellation *) self;
     59         interface_lock_exclusive(thiz);
     60         SLboolean enabled = thiz->mEnabled;
     61         if (NO_ECHOCANCEL(thiz)) {
     62             result = SL_RESULT_CONTROL_LOST;
     63         } else {
     64             *pEnabled = (SLboolean) thiz->mAECEffect->getEnabled();
     65             result = SL_RESULT_SUCCESS;
     66         }
     67         interface_unlock_exclusive(thiz);
     68     }
     69 
     70     SL_LEAVE_INTERFACE
     71 }
     72 
     73 SLresult IAndroidAcousticEchoCancellation_IsAvailable(SLAndroidAcousticEchoCancellationItf self,
     74                                                       SLboolean *pEnabled)
     75 {
     76     SL_ENTER_INTERFACE
     77 
     78     *pEnabled = false;
     79 
     80     uint32_t numEffects = 0;
     81     int ret = EffectQueryNumberEffects(&numEffects);
     82     if (ret != 0) {
     83         ALOGE("IAndroidAcousticEchoCancellation_IsAvailable() error %d querying number of effects",
     84               ret);
     85         result = SL_RESULT_FEATURE_UNSUPPORTED;
     86    } else {
     87         ALOGV("EffectQueryNumberEffects() numEffects=%d", numEffects);
     88 
     89         effect_descriptor_t fxDesc;
     90         for (uint32_t i = 0 ; i < numEffects ; i++) {
     91             if (EffectQueryEffect(i, &fxDesc) == 0) {
     92                 ALOGV("effect %d is called %s", i, fxDesc.name);
     93                 if (memcmp(&fxDesc.type, SL_IID_ANDROIDACOUSTICECHOCANCELLATION,
     94                            sizeof(effect_uuid_t)) == 0) {
     95                     ALOGI("found effect \"%s\" from %s", fxDesc.name, fxDesc.implementor);
     96                     *pEnabled = true;
     97                     break;
     98                 }
     99             }
    100         }
    101         result = SL_RESULT_SUCCESS;
    102     }
    103     SL_LEAVE_INTERFACE
    104 }
    105 
    106 static const struct SLAndroidAcousticEchoCancellationItf_ IAndroidAcousticEchoCancellation_Itf = {
    107     IAndroidAcousticEchoCancellation_SetEnabled,
    108     IAndroidAcousticEchoCancellation_IsEnabled,
    109     IAndroidAcousticEchoCancellation_IsAvailable
    110 };
    111 
    112 void IAndroidAcousticEchoCancellation_init(void *self)
    113 {
    114     IAndroidAcousticEchoCancellation *thiz = (IAndroidAcousticEchoCancellation *) self;
    115     thiz->mItf = &IAndroidAcousticEchoCancellation_Itf;
    116     thiz->mEnabled = SL_BOOLEAN_FALSE;
    117     memset(&thiz->mAECDescriptor, 0, sizeof(effect_descriptor_t));
    118     // placement new (explicit constructor)
    119     (void) new (&thiz->mAECEffect) android::sp<android::AudioEffect>();
    120 }
    121 
    122 void IAndroidAcousticEchoCancellation_deinit(void *self)
    123 {
    124     IAndroidAcousticEchoCancellation *thiz = (IAndroidAcousticEchoCancellation *) self;
    125     // explicit destructor
    126     thiz->mAECEffect.~sp();
    127 }
    128 
    129 bool IAndroidAcousticEchoCancellation_Expose(void *self)
    130 {
    131     IAndroidAcousticEchoCancellation *thiz = (IAndroidAcousticEchoCancellation *) self;
    132     if (!android_fx_initEffectDescriptor(SL_IID_ANDROIDACOUSTICECHOCANCELLATION,
    133                                          &thiz->mAECDescriptor)) {
    134         SL_LOGE("Acoustic Echo Cancellation initialization failed.");
    135         return false;
    136     }
    137     return true;
    138 }
    139