MediaExtractor.cpp revision 3001a8a6ed6cdd8cbf6e1ef85c5f47b4825f46db 
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
90private:
91    sp<IMemory> mMemory;
92    sp<DataSource> mSource;
93    RemoteDataSource(const sp<DataSource> &source);
94    DISALLOW_EVIL_CONSTRUCTORS(RemoteDataSource);
95};
96
97
98sp<IDataSource> RemoteDataSource::wrap(const sp<DataSource> &source) {
99    return new RemoteDataSource(source);
100}
101RemoteDataSource::RemoteDataSource(const sp<DataSource> &source) {
102    mSource = source;
103    sp<MemoryDealer> memoryDealer = new MemoryDealer(kBufferSize, "RemoteDataSource");
104    mMemory = memoryDealer->allocate(kBufferSize);
105    if (mMemory == NULL) {
106        ALOGE("Failed to allocate memory!");
107    }
108}
109RemoteDataSource::~RemoteDataSource() {
110    close();
111}
112sp<IMemory> RemoteDataSource::getIMemory() {
113    return mMemory;
114}
115ssize_t RemoteDataSource::readAt(off64_t offset, size_t size) {
116    ALOGV("readAt(%" PRId64 ", %zu)", offset, size);
117    return mSource->readAt(offset, mMemory->pointer(), size);
118}
119status_t RemoteDataSource::getSize(off64_t* size) {
120    return mSource->getSize(size);
121}
122void RemoteDataSource::close() {
123    mSource = NULL;
124}
125
126// static
127sp<IMediaExtractor> MediaExtractor::Create(
128        const sp<DataSource> &source, const char *mime) {
129    ALOGV("MediaExtractor::Create %s", mime);
130
131    char value[PROPERTY_VALUE_MAX];
132    if (property_get("media.stagefright.extractremote", value, NULL)
133            && (!strcmp("0", value) || !strcasecmp("false", value))) {
134        // local extractor
135        ALOGW("creating media extractor in calling process");
136        return CreateFromService(source, mime);
137    } else {
138        // remote extractor
139        ALOGV("get service manager");
140        sp<IBinder> binder = defaultServiceManager()->getService(String16("media.extractor"));
141
142        // Check if it's WVM, since WVMExtractor needs to be created in the media server process,
143        // not the extractor process.
144        String8 mime8;
145        float confidence;
146        sp<AMessage> meta;
147        if (SniffWVM(source, &mime8, &confidence, &meta) &&
148                !strcasecmp(mime8, MEDIA_MIMETYPE_CONTAINER_WVM)) {
149            return new WVMExtractor(source);
150        }
151
152        if (binder != 0) {
153            sp<IMediaExtractorService> mediaExService(interface_cast<IMediaExtractorService>(binder));
154            sp<IMediaExtractor> ex = mediaExService->makeExtractor(RemoteDataSource::wrap(source), mime);
155            return ex;
156        } else {
157            ALOGE("extractor service not running");
158            return NULL;
159        }
160    }
161    return NULL;
162}
163
164sp<MediaExtractor> MediaExtractor::CreateFromService(
165        const sp<DataSource> &source, const char *mime) {
166
167    ALOGV("MediaExtractor::CreateFromService %s", mime);
168    DataSource::RegisterDefaultSniffers();
169
170    sp<AMessage> meta;
171
172    String8 tmp;
173    if (mime == NULL) {
174        float confidence;
175        if (!source->sniff(&tmp, &confidence, &meta)) {
176            ALOGV("FAILED to autodetect media content.");
177
178            return NULL;
179        }
180
181        mime = tmp.string();
182        ALOGV("Autodetected media content as '%s' with confidence %.2f",
183             mime, confidence);
184    }
185
186    bool isDrm = false;
187    // DRM MIME type syntax is "drm+type+original" where
188    // type is "es_based" or "container_based" and
189    // original is the content's cleartext MIME type
190    if (!strncmp(mime, "drm+", 4)) {
191        const char *originalMime = strchr(mime+4, '+');
192        if (originalMime == NULL) {
193            // second + not found
194            return NULL;
195        }
196        ++originalMime;
197        if (!strncmp(mime, "drm+es_based+", 13)) {
198            // DRMExtractor sets container metadata kKeyIsDRM to 1
199            return new DRMExtractor(source, originalMime);
200        } else if (!strncmp(mime, "drm+container_based+", 20)) {
201            mime = originalMime;
202            isDrm = true;
203        } else {
204            return NULL;
205        }
206    }
207
208    MediaExtractor *ret = NULL;
209    if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_MPEG4)
210            || !strcasecmp(mime, "audio/mp4")) {
211        ret = new MPEG4Extractor(source);
212    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_MPEG)) {
213        ret = new MP3Extractor(source, meta);
214    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AMR_NB)
215            || !strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AMR_WB)) {
216        ret = new AMRExtractor(source);
217    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_FLAC)) {
218        ret = new FLACExtractor(source);
219    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_WAV)) {
220        ret = new WAVExtractor(source);
221    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_OGG)) {
222        ret = new OggExtractor(source);
223    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_MATROSKA)) {
224        ret = new MatroskaExtractor(source);
225    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_MPEG2TS)) {
226        ret = new MPEG2TSExtractor(source);
227    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_WVM) && getuid() == AID_MEDIA) {
228        // Return now.  WVExtractor should not have the DrmFlag set in the block below.
229        return new WVMExtractor(source);
230    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AAC_ADTS)) {
231        ret = new AACExtractor(source, meta);
232    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_MPEG2PS)) {
233        ret = new MPEG2PSExtractor(source);
234    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_MIDI)) {
235        ret = new MidiExtractor(source);
236    }
237
238    if (ret != NULL) {
239       if (isDrm) {
240           ret->setDrmFlag(true);
241       } else {
242           ret->setDrmFlag(false);
243       }
244    }
245
246    return ret;
247}
248
249}  // namespace android
250