MPEG4Extractor.h revision 5a1c3529e4fa2f8a11054181294e0ce79fff8dd3 
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#ifndef MPEG4_EXTRACTOR_H_
18
19#define MPEG4_EXTRACTOR_H_
20
21#include <media/stagefright/MediaExtractor.h>
22#include <utils/Vector.h>
23
24namespace android {
25
26struct AMessage;
27class DataSource;
28class SampleTable;
29class String8;
30
31class MPEG4Extractor : public MediaExtractor {
32public:
33    // Extractor assumes ownership of "source".
34    MPEG4Extractor(const sp<DataSource> &source);
35
36    virtual size_t countTracks();
37    virtual sp<MediaSource> getTrack(size_t index);
38    virtual sp<MetaData> getTrackMetaData(size_t index, uint32_t flags);
39
40    virtual sp<MetaData> getMetaData();
41
42protected:
43    virtual ~MPEG4Extractor();
44
45private:
46    struct Track {
47        Track *next;
48        sp<MetaData> meta;
49        uint32_t timescale;
50        sp<SampleTable> sampleTable;
51        bool includes_expensive_metadata;
52        bool skipTrack;
53    };
54
55    sp<DataSource> mDataSource;
56    bool mHaveMetadata;
57    bool mHasVideo;
58
59    Track *mFirstTrack, *mLastTrack;
60
61    sp<MetaData> mFileMetaData;
62
63    Vector<uint32_t> mPath;
64
65    status_t readMetaData();
66    status_t parseChunk(off_t *offset, int depth);
67    status_t parseMetaData(off_t offset, size_t size);
68
69    status_t updateAudioTrackInfoFromESDS_MPEG4Audio(
70            const void *esds_data, size_t esds_size);
71
72    static status_t verifyTrack(Track *track);
73
74    MPEG4Extractor(const MPEG4Extractor &);
75    MPEG4Extractor &operator=(const MPEG4Extractor &);
76};
77
78bool SniffMPEG4(
79        const sp<DataSource> &source, String8 *mimeType, float *confidence,
80        sp<AMessage> *);
81
82}  // namespace android
83
84#endif  // MPEG4_EXTRACTOR_H_
85