mediametadataretriever.cpp revision a17a1347ffe281fc70633ba8dc98f6cf49ac06ff 
1/*
2**
3** Copyright 2008, The Android Open Source Project
4**
5** Licensed under the Apache License, Version 2.0 (the "License");
6** you may not use this file except in compliance with the License.
7** You may obtain a copy of the License at
8**
9**     http://www.apache.org/licenses/LICENSE-2.0
10**
11** Unless required by applicable law or agreed to in writing, software
12** distributed under the License is distributed on an "AS IS" BASIS,
13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14** See the License for the specific language governing permissions and
15** limitations under the License.
16*/
17
18//#define LOG_NDEBUG 0
19#define LOG_TAG "MediaMetadataRetriever"
20
21#include <binder/IServiceManager.h>
22#include <binder/IPCThreadState.h>
23#include <media/mediametadataretriever.h>
24#include <media/IMediaPlayerService.h>
25#include <utils/Log.h>
26#include <dlfcn.h>
27
28namespace android {
29
30// client singleton for binder interface to service
31Mutex MediaMetadataRetriever::sServiceLock;
32sp<IMediaPlayerService> MediaMetadataRetriever::sService;
33sp<MediaMetadataRetriever::DeathNotifier> MediaMetadataRetriever::sDeathNotifier;
34
35const sp<IMediaPlayerService>& MediaMetadataRetriever::getService()
36{
37    Mutex::Autolock lock(sServiceLock);
38    if (sService.get() == 0) {
39        sp<IServiceManager> sm = defaultServiceManager();
40        sp<IBinder> binder;
41        do {
42            binder = sm->getService(String16("media.player"));
43            if (binder != 0) {
44                break;
45            }
46            LOGW("MediaPlayerService not published, waiting...");
47            usleep(500000); // 0.5 s
48        } while(true);
49        if (sDeathNotifier == NULL) {
50            sDeathNotifier = new DeathNotifier();
51        }
52        binder->linkToDeath(sDeathNotifier);
53        sService = interface_cast<IMediaPlayerService>(binder);
54    }
55    LOGE_IF(sService == 0, "no MediaPlayerService!?");
56    return sService;
57}
58
59MediaMetadataRetriever::MediaMetadataRetriever()
60{
61    LOGV("constructor");
62    const sp<IMediaPlayerService>& service(getService());
63    if (service == 0) {
64        LOGE("failed to obtain MediaMetadataRetrieverService");
65        return;
66    }
67    sp<IMediaMetadataRetriever> retriever(service->createMetadataRetriever(getpid()));
68    if (retriever == 0) {
69        LOGE("failed to create IMediaMetadataRetriever object from server");
70    }
71    mRetriever = retriever;
72}
73
74MediaMetadataRetriever::~MediaMetadataRetriever()
75{
76    LOGV("destructor");
77    disconnect();
78    IPCThreadState::self()->flushCommands();
79}
80
81void MediaMetadataRetriever::disconnect()
82{
83    LOGV("disconnect");
84    sp<IMediaMetadataRetriever> retriever;
85    {
86        Mutex::Autolock _l(mLock);
87        retriever = mRetriever;
88        mRetriever.clear();
89    }
90    if (retriever != 0) {
91        retriever->disconnect();
92    }
93}
94
95status_t MediaMetadataRetriever::setDataSource(const char* srcUrl)
96{
97    LOGV("setDataSource");
98    Mutex::Autolock _l(mLock);
99    if (mRetriever == 0) {
100        LOGE("retriever is not initialized");
101        return INVALID_OPERATION;
102    }
103    if (srcUrl == NULL) {
104        LOGE("data source is a null pointer");
105        return UNKNOWN_ERROR;
106    }
107    LOGV("data source (%s)", srcUrl);
108    return mRetriever->setDataSource(srcUrl);
109}
110
111status_t MediaMetadataRetriever::setDataSource(int fd, int64_t offset, int64_t length)
112{
113    LOGV("setDataSource(%d, %lld, %lld)", fd, offset, length);
114    Mutex::Autolock _l(mLock);
115    if (mRetriever == 0) {
116        LOGE("retriever is not initialized");
117        return INVALID_OPERATION;
118    }
119    if (fd < 0 || offset < 0 || length < 0) {
120        LOGE("Invalid negative argument");
121        return UNKNOWN_ERROR;
122    }
123    return mRetriever->setDataSource(fd, offset, length);
124}
125
126status_t MediaMetadataRetriever::setMode(int mode)
127{
128    LOGV("setMode(%d)", mode);
129    Mutex::Autolock _l(mLock);
130    if (mRetriever == 0) {
131        LOGE("retriever is not initialized");
132        return INVALID_OPERATION;
133    }
134    return mRetriever->setMode(mode);
135}
136
137status_t MediaMetadataRetriever::getMode(int* mode)
138{
139    LOGV("getMode");
140    Mutex::Autolock _l(mLock);
141    if (mRetriever == 0) {
142        LOGE("retriever is not initialized");
143        return INVALID_OPERATION;
144    }
145    return mRetriever->getMode(mode);
146}
147
148sp<IMemory> MediaMetadataRetriever::captureFrame()
149{
150    LOGV("captureFrame");
151    Mutex::Autolock _l(mLock);
152    if (mRetriever == 0) {
153        LOGE("retriever is not initialized");
154        return NULL;
155    }
156    return mRetriever->captureFrame();
157}
158
159const char* MediaMetadataRetriever::extractMetadata(int keyCode)
160{
161    LOGV("extractMetadata(%d)", keyCode);
162    Mutex::Autolock _l(mLock);
163    if (mRetriever == 0) {
164        LOGE("retriever is not initialized");
165        return NULL;
166    }
167    return mRetriever->extractMetadata(keyCode);
168}
169
170sp<IMemory> MediaMetadataRetriever::extractAlbumArt()
171{
172    LOGV("extractAlbumArt");
173    Mutex::Autolock _l(mLock);
174    if (mRetriever == 0) {
175        LOGE("retriever is not initialized");
176        return NULL;
177    }
178    return mRetriever->extractAlbumArt();
179}
180
181void MediaMetadataRetriever::DeathNotifier::binderDied(const wp<IBinder>& who) {
182    Mutex::Autolock lock(MediaMetadataRetriever::sServiceLock);
183    MediaMetadataRetriever::sService.clear();
184    LOGW("MediaMetadataRetriever server died!");
185}
186
187MediaMetadataRetriever::DeathNotifier::~DeathNotifier()
188{
189    Mutex::Autolock lock(sServiceLock);
190    if (sService != 0) {
191        sService->asBinder()->unlinkToDeath(this);
192    }
193}
194
195}; // namespace android
196