MediaExtractor.cpp revision b23a8a8d5d56dc308438d523a66554a3a59227cf 
1/*
2 * Copyright (C) 2009 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17//#define LOG_NDEBUG 0
18#define LOG_TAG "MediaExtractor"
19#include <utils/Log.h>
20#include <inttypes.h>
21#include <pwd.h>
22
23#include "include/AMRExtractor.h"
24#include "include/MP3Extractor.h"
25#include "include/MPEG4Extractor.h"
26#include "include/WAVExtractor.h"
27#include "include/OggExtractor.h"
28#include "include/MPEG2PSExtractor.h"
29#include "include/MPEG2TSExtractor.h"
30#include "include/DRMExtractor.h"
31#include "include/WVMExtractor.h"
32#include "include/FLACExtractor.h"
33#include "include/AACExtractor.h"
34#include "include/MidiExtractor.h"
35
36#include "matroska/MatroskaExtractor.h"
37
38#include <binder/IServiceManager.h>
39#include <binder/MemoryDealer.h>
40
41#include <media/stagefright/foundation/ADebug.h>
42#include <media/stagefright/foundation/AMessage.h>
43#include <media/stagefright/DataSource.h>
44#include <media/stagefright/MediaDefs.h>
45#include <media/stagefright/MediaExtractor.h>
46#include <media/stagefright/MetaData.h>
47#include <media/IMediaExtractorService.h>
48#include <cutils/properties.h>
49#include <utils/String8.h>
50#include <private/android_filesystem_config.h>
51
52
53namespace android {
54
55MediaExtractor::MediaExtractor():
56    mIsDrm(false) {
57    if (!LOG_NDEBUG) {
58        uid_t uid = getuid();
59        struct passwd *pw = getpwuid(uid);
60        ALOGI("extractor created in uid: %d (%s)", getuid(), pw->pw_name);
61    }
62
63}
64
65
66sp<MetaData> MediaExtractor::getMetaData() {
67    return new MetaData;
68}
69
70uint32_t MediaExtractor::flags() const {
71    return CAN_SEEK_BACKWARD | CAN_SEEK_FORWARD | CAN_PAUSE | CAN_SEEK;
72}
73
74
75
76class RemoteDataSource : public BnDataSource {
77public:
78    enum {
79        kBufferSize = 64 * 1024,
80    };
81
82    static sp<IDataSource> wrap(const sp<DataSource> &source);
83    virtual ~RemoteDataSource();
84
85    virtual sp<IMemory> getIMemory();
86    virtual ssize_t readAt(off64_t offset, size_t size);
87    virtual status_t getSize(off64_t* size);
88    virtual void close();
89    virtual uint32_t getFlags();
90    virtual String8 toString();
91    virtual sp<DecryptHandle> DrmInitialization(const char *mime);
92
93private:
94    sp<IMemory> mMemory;
95    sp<DataSource> mSource;
96    String8 mName;
97    explicit RemoteDataSource(const sp<DataSource> &source);
98    DISALLOW_EVIL_CONSTRUCTORS(RemoteDataSource);
99};
100
101
102sp<IDataSource> RemoteDataSource::wrap(const sp<DataSource> &source) {
103    return new RemoteDataSource(source);
104}
105RemoteDataSource::RemoteDataSource(const sp<DataSource> &source) {
106    mSource = source;
107    sp<MemoryDealer> memoryDealer = new MemoryDealer(kBufferSize, "RemoteDataSource");
108    mMemory = memoryDealer->allocate(kBufferSize);
109    if (mMemory == NULL) {
110        ALOGE("Failed to allocate memory!");
111    }
112    mName = String8::format("RemoteDataSource(%s)", mSource->toString().string());
113}
114RemoteDataSource::~RemoteDataSource() {
115    close();
116}
117sp<IMemory> RemoteDataSource::getIMemory() {
118    return mMemory;
119}
120ssize_t RemoteDataSource::readAt(off64_t offset, size_t size) {
121    ALOGV("readAt(%" PRId64 ", %zu)", offset, size);
122    return mSource->readAt(offset, mMemory->pointer(), size);
123}
124status_t RemoteDataSource::getSize(off64_t* size) {
125    return mSource->getSize(size);
126}
127void RemoteDataSource::close() {
128    mSource = NULL;
129}
130uint32_t RemoteDataSource::getFlags() {
131    return mSource->flags();
132}
133
134String8 RemoteDataSource::toString() {
135    return mName;
136}
137
138sp<DecryptHandle> RemoteDataSource::DrmInitialization(const char *mime) {
139    return mSource->DrmInitialization(mime);
140}
141
142// static
143sp<IMediaExtractor> MediaExtractor::Create(
144        const sp<DataSource> &source, const char *mime) {
145    ALOGV("MediaExtractor::Create %s", mime);
146
147    char value[PROPERTY_VALUE_MAX];
148    if (property_get("media.stagefright.extractremote", value, NULL)
149            && (!strcmp("0", value) || !strcasecmp("false", value))) {
150        // local extractor
151        ALOGW("creating media extractor in calling process");
152        return CreateFromService(source, mime);
153    } else {
154        // remote extractor
155        ALOGV("get service manager");
156        sp<IBinder> binder = defaultServiceManager()->getService(String16("media.extractor"));
157
158        // Check if it's WVM, since WVMExtractor needs to be created in the media server process,
159        // not the extractor process.
160        String8 mime8;
161        float confidence;
162        sp<AMessage> meta;
163        if (SniffWVM(source, &mime8, &confidence, &meta) &&
164                !strcasecmp(mime8, MEDIA_MIMETYPE_CONTAINER_WVM)) {
165            return new WVMExtractor(source);
166        }
167
168        if (binder != 0) {
169            sp<IMediaExtractorService> mediaExService(interface_cast<IMediaExtractorService>(binder));
170            sp<IMediaExtractor> ex = mediaExService->makeExtractor(RemoteDataSource::wrap(source), mime);
171            return ex;
172        } else {
173            ALOGE("extractor service not running");
174            return NULL;
175        }
176    }
177    return NULL;
178}
179
180sp<MediaExtractor> MediaExtractor::CreateFromService(
181        const sp<DataSource> &source, const char *mime) {
182
183    ALOGV("MediaExtractor::CreateFromService %s", mime);
184    DataSource::RegisterDefaultSniffers();
185
186    sp<AMessage> meta;
187
188    String8 tmp;
189    if (mime == NULL) {
190        float confidence;
191        if (!source->sniff(&tmp, &confidence, &meta)) {
192            ALOGV("FAILED to autodetect media content.");
193
194            return NULL;
195        }
196
197        mime = tmp.string();
198        ALOGV("Autodetected media content as '%s' with confidence %.2f",
199             mime, confidence);
200    }
201
202    bool isDrm = false;
203    // DRM MIME type syntax is "drm+type+original" where
204    // type is "es_based" or "container_based" and
205    // original is the content's cleartext MIME type
206    if (!strncmp(mime, "drm+", 4)) {
207        const char *originalMime = strchr(mime+4, '+');
208        if (originalMime == NULL) {
209            // second + not found
210            return NULL;
211        }
212        ++originalMime;
213        if (!strncmp(mime, "drm+es_based+", 13)) {
214            // DRMExtractor sets container metadata kKeyIsDRM to 1
215            return new DRMExtractor(source, originalMime);
216        } else if (!strncmp(mime, "drm+container_based+", 20)) {
217            mime = originalMime;
218            isDrm = true;
219        } else {
220            return NULL;
221        }
222    }
223
224    MediaExtractor *ret = NULL;
225    if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_MPEG4)
226            || !strcasecmp(mime, "audio/mp4")) {
227        ret = new MPEG4Extractor(source);
228    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_MPEG)) {
229        ret = new MP3Extractor(source, meta);
230    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AMR_NB)
231            || !strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AMR_WB)) {
232        ret = new AMRExtractor(source);
233    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_FLAC)) {
234        ret = new FLACExtractor(source);
235    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_WAV)) {
236        ret = new WAVExtractor(source);
237    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_OGG)) {
238        ret = new OggExtractor(source);
239    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_MATROSKA)) {
240        ret = new MatroskaExtractor(source);
241    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_MPEG2TS)) {
242        ret = new MPEG2TSExtractor(source);
243    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_WVM) && getuid() == AID_MEDIA) {
244        // Return now.  WVExtractor should not have the DrmFlag set in the block below.
245        return new WVMExtractor(source);
246    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AAC_ADTS)) {
247        ret = new AACExtractor(source, meta);
248    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_MPEG2PS)) {
249        ret = new MPEG2PSExtractor(source);
250    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_MIDI)) {
251        ret = new MidiExtractor(source);
252    }
253
254    if (ret != NULL) {
255       if (isDrm) {
256           ret->setDrmFlag(true);
257       } else {
258           ret->setDrmFlag(false);
259       }
260    }
261
262    return ret;
263}
264
265}  // namespace android
266