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 */
27static inline bool NO_ECHOCANCEL(IAndroidAcousticEchoCancellation* v) {
28    return (v->mAECEffect == 0);
29}
30
31static 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
50static 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
73SLresult 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
106static const struct SLAndroidAcousticEchoCancellationItf_ IAndroidAcousticEchoCancellation_Itf = {
107    IAndroidAcousticEchoCancellation_SetEnabled,
108    IAndroidAcousticEchoCancellation_IsEnabled,
109    IAndroidAcousticEchoCancellation_IsAvailable
110};
111
112void 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
122void IAndroidAcousticEchoCancellation_deinit(void *self)
123{
124    IAndroidAcousticEchoCancellation *thiz = (IAndroidAcousticEchoCancellation *) self;
125    // explicit destructor
126    thiz->mAECEffect.~sp();
127}
128
129bool 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