IMediaMetadataRetriever.cpp revision 16afe2fb439cab6125bb46a07a8078d4ce1c1ea5 
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    SET_MODE,
85    GET_FRAME_AT_TIME,
86    EXTRACT_ALBUM_ART,
87    EXTRACT_METADATA,
88};
89
90class BpMediaMetadataRetriever: public BpInterface<IMediaMetadataRetriever>
91{
92public:
93    BpMediaMetadataRetriever(const sp<IBinder>& impl)
94        : BpInterface<IMediaMetadataRetriever>(impl)
95    {
96    }
97
98    // disconnect from media metadata retriever service
99    void disconnect()
100    {
101        Parcel data, reply;
102        data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
103        remote()->transact(DISCONNECT, data, &reply);
104    }
105
106    status_t setDataSource(const char* srcUrl)
107    {
108        Parcel data, reply;
109        data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
110        data.writeCString(srcUrl);
111        remote()->transact(SET_DATA_SOURCE_URL, data, &reply);
112        return reply.readInt32();
113    }
114
115    status_t setDataSource(int fd, int64_t offset, int64_t length)
116    {
117        Parcel data, reply;
118        data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
119        data.writeFileDescriptor(fd);
120        data.writeInt64(offset);
121        data.writeInt64(length);
122        remote()->transact(SET_DATA_SOURCE_FD, data, &reply);
123        return reply.readInt32();
124    }
125
126    status_t setMode(int mode)
127    {
128        Parcel data, reply;
129        data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
130        data.writeInt32(mode);
131        remote()->transact(SET_MODE, data, &reply);
132        return reply.readInt32();
133    }
134
135    sp<IMemory> getFrameAtTime(int64_t timeUs, int option)
136    {
137        LOGV("getTimeAtTime: time(%lld us) and option(%d)", timeUs, option);
138        Parcel data, reply;
139        data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
140        data.writeInt64(timeUs);
141        data.writeInt32(option);
142#ifndef DISABLE_GROUP_SCHEDULE_HACK
143        sendSchedPolicy(data);
144#endif
145        remote()->transact(GET_FRAME_AT_TIME, data, &reply);
146        status_t ret = reply.readInt32();
147        if (ret != NO_ERROR) {
148            return NULL;
149        }
150        return interface_cast<IMemory>(reply.readStrongBinder());
151    }
152
153    sp<IMemory> extractAlbumArt()
154    {
155        Parcel data, reply;
156        data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
157#ifndef DISABLE_GROUP_SCHEDULE_HACK
158        sendSchedPolicy(data);
159#endif
160        remote()->transact(EXTRACT_ALBUM_ART, data, &reply);
161        status_t ret = reply.readInt32();
162        if (ret != NO_ERROR) {
163            return NULL;
164        }
165        return interface_cast<IMemory>(reply.readStrongBinder());
166    }
167
168    const char* extractMetadata(int keyCode)
169    {
170        Parcel data, reply;
171        data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
172#ifndef DISABLE_GROUP_SCHEDULE_HACK
173        sendSchedPolicy(data);
174#endif
175        data.writeInt32(keyCode);
176        remote()->transact(EXTRACT_METADATA, data, &reply);
177        status_t ret = reply.readInt32();
178        if (ret != NO_ERROR) {
179            return NULL;
180        }
181        return reply.readCString();
182    }
183};
184
185IMPLEMENT_META_INTERFACE(MediaMetadataRetriever, "android.media.IMediaMetadataRetriever");
186
187// ----------------------------------------------------------------------
188
189status_t BnMediaMetadataRetriever::onTransact(
190    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
191{
192    switch (code) {
193        case DISCONNECT: {
194            CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
195            disconnect();
196            return NO_ERROR;
197        } break;
198        case SET_DATA_SOURCE_URL: {
199            CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
200            const char* srcUrl = data.readCString();
201            reply->writeInt32(setDataSource(srcUrl));
202            return NO_ERROR;
203        } break;
204        case SET_DATA_SOURCE_FD: {
205            CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
206            int fd = dup(data.readFileDescriptor());
207            int64_t offset = data.readInt64();
208            int64_t length = data.readInt64();
209            reply->writeInt32(setDataSource(fd, offset, length));
210            return NO_ERROR;
211        } break;
212        case SET_MODE: {
213            CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
214            int mode = data.readInt32();
215            reply->writeInt32(setMode(mode));
216            return NO_ERROR;
217        } break;
218        case GET_FRAME_AT_TIME: {
219            CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
220            int64_t timeUs = data.readInt64();
221            int option = data.readInt32();
222            LOGV("getTimeAtTime: time(%lld us) and option(%d)", timeUs, option);
223#ifndef DISABLE_GROUP_SCHEDULE_HACK
224            setSchedPolicy(data);
225#endif
226            sp<IMemory> bitmap = getFrameAtTime(timeUs, option);
227            if (bitmap != 0) {  // Don't send NULL across the binder interface
228                reply->writeInt32(NO_ERROR);
229                reply->writeStrongBinder(bitmap->asBinder());
230            } else {
231                reply->writeInt32(UNKNOWN_ERROR);
232            }
233#ifndef DISABLE_GROUP_SCHEDULE_HACK
234            restoreSchedPolicy();
235#endif
236            return NO_ERROR;
237        } break;
238        case EXTRACT_ALBUM_ART: {
239            CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
240#ifndef DISABLE_GROUP_SCHEDULE_HACK
241            setSchedPolicy(data);
242#endif
243            sp<IMemory> albumArt = extractAlbumArt();
244            if (albumArt != 0) {  // Don't send NULL across the binder interface
245                reply->writeInt32(NO_ERROR);
246                reply->writeStrongBinder(albumArt->asBinder());
247            } else {
248                reply->writeInt32(UNKNOWN_ERROR);
249            }
250#ifndef DISABLE_GROUP_SCHEDULE_HACK
251            restoreSchedPolicy();
252#endif
253            return NO_ERROR;
254        } break;
255        case EXTRACT_METADATA: {
256            CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
257#ifndef DISABLE_GROUP_SCHEDULE_HACK
258            setSchedPolicy(data);
259#endif
260            int keyCode = data.readInt32();
261            const char* value = extractMetadata(keyCode);
262            if (value != NULL) {  // Don't send NULL across the binder interface
263                reply->writeInt32(NO_ERROR);
264                reply->writeCString(value);
265            } else {
266                reply->writeInt32(UNKNOWN_ERROR);
267            }
268#ifndef DISABLE_GROUP_SCHEDULE_HACK
269            restoreSchedPolicy();
270#endif
271            return NO_ERROR;
272        } break;
273        default:
274            return BBinder::onTransact(code, data, reply, flags);
275    }
276}
277
278// ----------------------------------------------------------------------------
279
280}; // namespace android
281