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
24SLresult 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
39SLresult 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
47void 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
58predestroy_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