summaryrefslogtreecommitdiffstats
path: root/media/libmedia/IMediaMetadataRetriever.cpp
blob: 7e6d54bdf07f50c2d19fd03f6d98824976367687 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
/*
**
** Copyright (C) 2008 The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
**     http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/

#include <stdint.h>
#include <sys/types.h>
#include <binder/Parcel.h>
#include <media/IMediaMetadataRetriever.h>
#include <utils/String8.h>

// The binder is supposed to propagate the scheduler group across
// the binder interface so that remote calls are executed with
// the same priority as local calls. This is currently not working
// so this change puts in a temporary hack to fix the issue with
// metadata retrieval which can be a huge CPU hit if done on a
// foreground thread.
#ifndef DISABLE_GROUP_SCHEDULE_HACK

#undef LOG_TAG
#define LOG_TAG "IMediaMetadataRetriever"
#include <utils/Log.h>
#include <cutils/sched_policy.h>

namespace android {

static void sendSchedPolicy(Parcel& data)
{
    SchedPolicy policy;
    get_sched_policy(gettid(), &policy);
    data.writeInt32(policy);
}

static void setSchedPolicy(const Parcel& data)
{
    SchedPolicy policy = (SchedPolicy) data.readInt32();
    set_sched_policy(gettid(), policy);
}
static void restoreSchedPolicy()
{
    set_sched_policy(gettid(), SP_FOREGROUND);
}
}; // end namespace android
#endif

namespace android {

enum {
    DISCONNECT = IBinder::FIRST_CALL_TRANSACTION,
    SET_DATA_SOURCE_URL,
    SET_DATA_SOURCE_FD,
    GET_FRAME_AT_TIME,
    EXTRACT_ALBUM_ART,
    EXTRACT_METADATA,
};

class BpMediaMetadataRetriever: public BpInterface<IMediaMetadataRetriever>
{
public:
    BpMediaMetadataRetriever(const sp<IBinder>& impl)
        : BpInterface<IMediaMetadataRetriever>(impl)
    {
    }

    // disconnect from media metadata retriever service
    void disconnect()
    {
        Parcel data, reply;
        data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
        remote()->transact(DISCONNECT, data, &reply);
    }

    status_t setDataSource(
            const char *srcUrl, const KeyedVector<String8, String8> *headers)
    {
        Parcel data, reply;
        data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
        data.writeCString(srcUrl);

        if (headers == NULL) {
            data.writeInt32(0);
        } else {
            // serialize the headers
            data.writeInt32(headers->size());
            for (size_t i = 0; i < headers->size(); ++i) {
                data.writeString8(headers->keyAt(i));
                data.writeString8(headers->valueAt(i));
            }
        }

        remote()->transact(SET_DATA_SOURCE_URL, data, &reply);
        return reply.readInt32();
    }

    status_t setDataSource(int fd, int64_t offset, int64_t length)
    {
        Parcel data, reply;
        data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
        data.writeFileDescriptor(fd);
        data.writeInt64(offset);
        data.writeInt64(length);
        remote()->transact(SET_DATA_SOURCE_FD, data, &reply);
        return reply.readInt32();
    }

    sp<IMemory> getFrameAtTime(int64_t timeUs, int option)
    {
        ALOGV("getTimeAtTime: time(%lld us) and option(%d)", timeUs, option);
        Parcel data, reply;
        data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
        data.writeInt64(timeUs);
        data.writeInt32(option);
#ifndef DISABLE_GROUP_SCHEDULE_HACK
        sendSchedPolicy(data);
#endif
        remote()->transact(GET_FRAME_AT_TIME, data, &reply);
        status_t ret = reply.readInt32();
        if (ret != NO_ERROR) {
            return NULL;
        }
        return interface_cast<IMemory>(reply.readStrongBinder());
    }

    sp<IMemory> extractAlbumArt()
    {
        Parcel data, reply;
        data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
#ifndef DISABLE_GROUP_SCHEDULE_HACK
        sendSchedPolicy(data);
#endif
        remote()->transact(EXTRACT_ALBUM_ART, data, &reply);
        status_t ret = reply.readInt32();
        if (ret != NO_ERROR) {
            return NULL;
        }
        return interface_cast<IMemory>(reply.readStrongBinder());
    }

    const char* extractMetadata(int keyCode)
    {
        Parcel data, reply;
        data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
#ifndef DISABLE_GROUP_SCHEDULE_HACK
        sendSchedPolicy(data);
#endif
        data.writeInt32(keyCode);
        remote()->transact(EXTRACT_METADATA, data, &reply);
        status_t ret = reply.readInt32();
        if (ret != NO_ERROR) {
            return NULL;
        }
        return reply.readCString();
    }
};

IMPLEMENT_META_INTERFACE(MediaMetadataRetriever, "android.media.IMediaMetadataRetriever");

// ----------------------------------------------------------------------

status_t BnMediaMetadataRetriever::onTransact(
    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
{
    switch (code) {
        case DISCONNECT: {
            CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
            disconnect();
            return NO_ERROR;
        } break;
        case SET_DATA_SOURCE_URL: {
            CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
            const char* srcUrl = data.readCString();

            KeyedVector<String8, String8> headers;
            int32_t numHeaders = data.readInt32();
            for (int i = 0; i < numHeaders; ++i) {
                String8 key = data.readString8();
                String8 value = data.readString8();
                headers.add(key, value);
            }

            reply->writeInt32(
                    setDataSource(srcUrl, numHeaders > 0 ? &headers : NULL));

            return NO_ERROR;
        } break;
        case SET_DATA_SOURCE_FD: {
            CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
            int fd = dup(data.readFileDescriptor());
            int64_t offset = data.readInt64();
            int64_t length = data.readInt64();
            reply->writeInt32(setDataSource(fd, offset, length));
            return NO_ERROR;
        } break;
        case GET_FRAME_AT_TIME: {
            CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
            int64_t timeUs = data.readInt64();
            int option = data.readInt32();
            ALOGV("getTimeAtTime: time(%lld us) and option(%d)", timeUs, option);
#ifndef DISABLE_GROUP_SCHEDULE_HACK
            setSchedPolicy(data);
#endif
            sp<IMemory> bitmap = getFrameAtTime(timeUs, option);
            if (bitmap != 0) {  // Don't send NULL across the binder interface
                reply->writeInt32(NO_ERROR);
                reply->writeStrongBinder(bitmap->asBinder());
            } else {
                reply->writeInt32(UNKNOWN_ERROR);
            }
#ifndef DISABLE_GROUP_SCHEDULE_HACK
            restoreSchedPolicy();
#endif
            return NO_ERROR;
        } break;
        case EXTRACT_ALBUM_ART: {
            CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
#ifndef DISABLE_GROUP_SCHEDULE_HACK
            setSchedPolicy(data);
#endif
            sp<IMemory> albumArt = extractAlbumArt();
            if (albumArt != 0) {  // Don't send NULL across the binder interface
                reply->writeInt32(NO_ERROR);
                reply->writeStrongBinder(albumArt->asBinder());
            } else {
                reply->writeInt32(UNKNOWN_ERROR);
            }
#ifndef DISABLE_GROUP_SCHEDULE_HACK
            restoreSchedPolicy();
#endif
            return NO_ERROR;
        } break;
        case EXTRACT_METADATA: {
            CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
#ifndef DISABLE_GROUP_SCHEDULE_HACK
            setSchedPolicy(data);
#endif
            int keyCode = data.readInt32();
            const char* value = extractMetadata(keyCode);
            if (value != NULL) {  // Don't send NULL across the binder interface
                reply->writeInt32(NO_ERROR);
                reply->writeCString(value);
            } else {
                reply->writeInt32(UNKNOWN_ERROR);
            }
#ifndef DISABLE_GROUP_SCHEDULE_HACK
            restoreSchedPolicy();
#endif
            return NO_ERROR;
        } break;
        default:
            return BBinder::onTransact(code, data, reply, flags);
    }
}

// ----------------------------------------------------------------------------

}; // namespace android