IMediaMetadataRetriever.cpp revision 95304d5488ba465f19cc788f1c7394218c2ea2d1 
1/*
2**
3** Copyright (C) 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#include <stdint.h>
19#include <sys/types.h>
20#include <binder/Parcel.h>
21#include <SkBitmap.h>
22#include <media/IMediaMetadataRetriever.h>
23
24// The binder is supposed to propagate the scheduler group across
25// the binder interface so that remote calls are executed with
26// the same priority as local calls. This is currently not working
27// so this change puts in a temporary hack to fix the issue with
28// metadata retrieval which can be a huge CPU hit if done on a
29// foreground thread.
30#ifndef DISABLE_GROUP_SCHEDULE_HACK
31
32/* desktop Linux needs a little help with gettid() */
33#if defined(HAVE_GETTID) && !defined(HAVE_ANDROID_OS)
34#define __KERNEL__
35# include <linux/unistd.h>
36#ifdef _syscall0
37_syscall0(pid_t,gettid)
38#else
39pid_t gettid() { return syscall(__NR_gettid);}
40#endif
41#undef __KERNEL__
42#endif
43
44static int myTid() {
45#ifdef HAVE_GETTID
46    return gettid();
47#else
48    return getpid();
49#endif
50}
51
52#undef LOG_TAG
53#define LOG_TAG "IMediaMetadataRetriever"
54#include <utils/Log.h>
55#include <cutils/sched_policy.h>
56
57namespace android {
58
59static void sendSchedPolicy(Parcel& data)
60{
61    SchedPolicy policy;
62    get_sched_policy(myTid(), &policy);
63    data.writeInt32(policy);
64}
65
66static void setSchedPolicy(const Parcel& data)
67{
68    SchedPolicy policy = (SchedPolicy) data.readInt32();
69    set_sched_policy(myTid(), policy);
70}
71static void restoreSchedPolicy()
72{
73    set_sched_policy(myTid(), SP_FOREGROUND);
74}
75}; // end namespace android
76#endif
77
78namespace android {
79
80enum {
81    DISCONNECT = IBinder::FIRST_CALL_TRANSACTION,
82    SET_DATA_SOURCE_URL,
83    SET_DATA_SOURCE_FD,
84    GET_FRAME_AT_TIME,
85    EXTRACT_ALBUM_ART,
86    EXTRACT_METADATA,
87};
88
89class BpMediaMetadataRetriever: public BpInterface<IMediaMetadataRetriever>
90{
91public:
92    BpMediaMetadataRetriever(const sp<IBinder>& impl)
93        : BpInterface<IMediaMetadataRetriever>(impl)
94    {
95    }
96
97    // disconnect from media metadata retriever service
98    void disconnect()
99    {
100        Parcel data, reply;
101        data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
102        remote()->transact(DISCONNECT, data, &reply);
103    }
104
105    status_t setDataSource(const char* srcUrl)
106    {
107        Parcel data, reply;
108        data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
109        data.writeCString(srcUrl);
110        remote()->transact(SET_DATA_SOURCE_URL, data, &reply);
111        return reply.readInt32();
112    }
113
114    status_t setDataSource(int fd, int64_t offset, int64_t length)
115    {
116        Parcel data, reply;
117        data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
118        data.writeFileDescriptor(fd);
119        data.writeInt64(offset);
120        data.writeInt64(length);
121        remote()->transact(SET_DATA_SOURCE_FD, data, &reply);
122        return reply.readInt32();
123    }
124
125    sp<IMemory> getFrameAtTime(int64_t timeUs, int option)
126    {
127        LOGV("getTimeAtTime: time(%lld us) and option(%d)", timeUs, option);
128        Parcel data, reply;
129        data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
130        data.writeInt64(timeUs);
131        data.writeInt32(option);
132#ifndef DISABLE_GROUP_SCHEDULE_HACK
133        sendSchedPolicy(data);
134#endif
135        remote()->transact(GET_FRAME_AT_TIME, data, &reply);
136        status_t ret = reply.readInt32();
137        if (ret != NO_ERROR) {
138            return NULL;
139        }
140        return interface_cast<IMemory>(reply.readStrongBinder());
141    }
142
143    sp<IMemory> extractAlbumArt()
144    {
145        Parcel data, reply;
146        data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
147#ifndef DISABLE_GROUP_SCHEDULE_HACK
148        sendSchedPolicy(data);
149#endif
150        remote()->transact(EXTRACT_ALBUM_ART, data, &reply);
151        status_t ret = reply.readInt32();
152        if (ret != NO_ERROR) {
153            return NULL;
154        }
155        return interface_cast<IMemory>(reply.readStrongBinder());
156    }
157
158    const char* extractMetadata(int keyCode)
159    {
160        Parcel data, reply;
161        data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
162#ifndef DISABLE_GROUP_SCHEDULE_HACK
163        sendSchedPolicy(data);
164#endif
165        data.writeInt32(keyCode);
166        remote()->transact(EXTRACT_METADATA, data, &reply);
167        status_t ret = reply.readInt32();
168        if (ret != NO_ERROR) {
169            return NULL;
170        }
171        return reply.readCString();
172    }
173};
174
175IMPLEMENT_META_INTERFACE(MediaMetadataRetriever, "android.media.IMediaMetadataRetriever");
176
177// ----------------------------------------------------------------------
178
179status_t BnMediaMetadataRetriever::onTransact(
180    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
181{
182    switch (code) {
183        case DISCONNECT: {
184            CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
185            disconnect();
186            return NO_ERROR;
187        } break;
188        case SET_DATA_SOURCE_URL: {
189            CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
190            const char* srcUrl = data.readCString();
191            reply->writeInt32(setDataSource(srcUrl));
192            return NO_ERROR;
193        } break;
194        case SET_DATA_SOURCE_FD: {
195            CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
196            int fd = dup(data.readFileDescriptor());
197            int64_t offset = data.readInt64();
198            int64_t length = data.readInt64();
199            reply->writeInt32(setDataSource(fd, offset, length));
200            return NO_ERROR;
201        } break;
202        case GET_FRAME_AT_TIME: {
203            CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
204            int64_t timeUs = data.readInt64();
205            int option = data.readInt32();
206            LOGV("getTimeAtTime: time(%lld us) and option(%d)", timeUs, option);
207#ifndef DISABLE_GROUP_SCHEDULE_HACK
208            setSchedPolicy(data);
209#endif
210            sp<IMemory> bitmap = getFrameAtTime(timeUs, option);
211            if (bitmap != 0) {  // Don't send NULL across the binder interface
212                reply->writeInt32(NO_ERROR);
213                reply->writeStrongBinder(bitmap->asBinder());
214            } else {
215                reply->writeInt32(UNKNOWN_ERROR);
216            }
217#ifndef DISABLE_GROUP_SCHEDULE_HACK
218            restoreSchedPolicy();
219#endif
220            return NO_ERROR;
221        } break;
222        case EXTRACT_ALBUM_ART: {
223            CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
224#ifndef DISABLE_GROUP_SCHEDULE_HACK
225            setSchedPolicy(data);
226#endif
227            sp<IMemory> albumArt = extractAlbumArt();
228            if (albumArt != 0) {  // Don't send NULL across the binder interface
229                reply->writeInt32(NO_ERROR);
230                reply->writeStrongBinder(albumArt->asBinder());
231            } else {
232                reply->writeInt32(UNKNOWN_ERROR);
233            }
234#ifndef DISABLE_GROUP_SCHEDULE_HACK
235            restoreSchedPolicy();
236#endif
237            return NO_ERROR;
238        } break;
239        case EXTRACT_METADATA: {
240            CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
241#ifndef DISABLE_GROUP_SCHEDULE_HACK
242            setSchedPolicy(data);
243#endif
244            int keyCode = data.readInt32();
245            const char* value = extractMetadata(keyCode);
246            if (value != NULL) {  // Don't send NULL across the binder interface
247                reply->writeInt32(NO_ERROR);
248                reply->writeCString(value);
249            } else {
250                reply->writeInt32(UNKNOWN_ERROR);
251            }
252#ifndef DISABLE_GROUP_SCHEDULE_HACK
253            restoreSchedPolicy();
254#endif
255            return NO_ERROR;
256        } break;
257        default:
258            return BBinder::onTransact(code, data, reply, flags);
259    }
260}
261
262// ----------------------------------------------------------------------------
263
264}; // namespace android
265