mediametadataretriever.cpp revision 89fa4ad53f2f4d57adbc97ae1149fc00c9b6f3c5 
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 <utils/IServiceManager.h>
22#include <utils/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    if (mRetriever == 0) {
99        LOGE("retriever is not initialized");
100        return INVALID_OPERATION;
101    }
102    if (srcUrl == NULL) {
103        LOGE("data source is a null pointer");
104        return UNKNOWN_ERROR;
105    }
106    LOGV("data source (%s)", srcUrl);
107    return mRetriever->setDataSource(srcUrl);
108}
109
110status_t MediaMetadataRetriever::setDataSource(int fd, int64_t offset, int64_t length)
111{
112    LOGV("setDataSource(%d, %lld, %lld)", fd, offset, length);
113    if (mRetriever == 0) {
114        LOGE("retriever is not initialized");
115        return INVALID_OPERATION;
116    }
117    if (fd < 0 || offset < 0 || length < 0) {
118        LOGE("Invalid negative argument");
119        return UNKNOWN_ERROR;
120    }
121    return mRetriever->setDataSource(fd, offset, length);
122}
123
124status_t MediaMetadataRetriever::setMode(int mode)
125{
126    LOGV("setMode(%d)", mode);
127    if (mRetriever == 0) {
128        LOGE("retriever is not initialized");
129        return INVALID_OPERATION;
130    }
131    return mRetriever->setMode(mode);
132}
133
134status_t MediaMetadataRetriever::getMode(int* mode)
135{
136    LOGV("getMode");
137    if (mRetriever == 0) {
138        LOGE("retriever is not initialized");
139        return INVALID_OPERATION;
140    }
141    return mRetriever->getMode(mode);
142}
143
144sp<IMemory> MediaMetadataRetriever::captureFrame()
145{
146    LOGV("captureFrame");
147    if (mRetriever == 0) {
148        LOGE("retriever is not initialized");
149        return NULL;
150    }
151    return mRetriever->captureFrame();
152}
153
154const char* MediaMetadataRetriever::extractMetadata(int keyCode)
155{
156    LOGV("extractMetadata(%d)", keyCode);
157    if (mRetriever == 0) {
158        LOGE("retriever is not initialized");
159        return NULL;
160    }
161    return mRetriever->extractMetadata(keyCode);
162}
163
164sp<IMemory> MediaMetadataRetriever::extractAlbumArt()
165{
166    LOGV("extractAlbumArt");
167    if (mRetriever == 0) {
168        LOGE("retriever is not initialized");
169        return NULL;
170    }
171    return mRetriever->extractAlbumArt();
172}
173
174void MediaMetadataRetriever::DeathNotifier::binderDied(const wp<IBinder>& who) {
175    Mutex::Autolock lock(MediaMetadataRetriever::sServiceLock);
176    MediaMetadataRetriever::sService.clear();
177    LOGW("MediaMetadataRetriever server died!");
178}
179
180MediaMetadataRetriever::DeathNotifier::~DeathNotifier()
181{
182    Mutex::Autolock lock(sServiceLock);
183    if (sService != 0) {
184        sService->asBinder()->unlinkToDeath(this);
185    }
186}
187
188}; // namespace android
189