1 /*
2 * Copyright (C) 2010 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 /* \file COutputMix.c OutputMix class */
18
19 #include "sles_allinclusive.h"
20
21
22 /** \brief Hook called by Object::Realize when an output mix is realized */
23
COutputMix_Realize(void * self,SLboolean async)24 SLresult COutputMix_Realize(void *self, SLboolean async)
25 {
26 SLresult result = SL_RESULT_SUCCESS;
27
28 #ifdef ANDROID
29 COutputMix *thiz = (COutputMix *) self;
30 result = android_outputMix_realize(thiz, async);
31 #endif
32
33 return result;
34 }
35
36
37 /** \brief Hook called by Object::Resume when an output mix is resumed */
38
COutputMix_Resume(void * self,SLboolean async)39 SLresult COutputMix_Resume(void *self, SLboolean async)
40 {
41 return SL_RESULT_SUCCESS;
42 }
43
44
45 /** \brief Hook called by Object::Destroy when an output mix is destroyed */
46
COutputMix_Destroy(void * self)47 void COutputMix_Destroy(void *self)
48 {
49 #ifdef ANDROID
50 COutputMix *thiz = (COutputMix *) self;
51 android_outputMix_destroy(thiz);
52 #endif
53 }
54
55
56 /** \brief Hook called by Object::Destroy before an output mix is about to be destroyed */
57
COutputMix_PreDestroy(void * self)58 predestroy_t COutputMix_PreDestroy(void *self)
59 {
60 // Ignore destroy requests if there are any players attached to this output mix
61 COutputMix *outputMix = (COutputMix *) self;
62 // See design document for explanation
63 if (0 == outputMix->mObject.mStrongRefCount) {
64 #ifdef USE_OUTPUTMIXEXT
65 // We only support a single active output mix per engine, so check if this is the active mix
66 IEngine *thisEngine = &outputMix->mObject.mEngine->mEngine;
67 interface_lock_exclusive(thisEngine);
68 bool thisIsTheActiveOutputMix = false;
69 if (outputMix == thisEngine->mOutputMix) {
70 thisIsTheActiveOutputMix = true;
71 }
72 interface_unlock_exclusive(thisEngine);
73 if (thisIsTheActiveOutputMix) {
74 // Tell the asynchronous mixer callback that we want to destroy the output mix
75 outputMix->mOutputMixExt.mDestroyRequested = true;
76 while (outputMix->mOutputMixExt.mDestroyRequested) {
77 object_cond_wait(&outputMix->mObject);
78 }
79 #ifdef USE_SDL
80 // Mixer callback has acknowledged our request and unlinked output mix from engine.
81 // Disable SDL_callback from being called periodically by SDL's internal thread.
82 SDL_PauseAudio(1);
83 #endif
84 }
85 #endif
86 return predestroy_ok;
87 }
88 SL_LOGE("Object::Destroy(%p) for OutputMix ignored; %u players attached", outputMix,
89 outputMix->mObject.mStrongRefCount);
90 return predestroy_error;
91 }
92