MP3Extractor.h revision 4456da54bcd206ed1f518c69cc959ca65a179c83 
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 MP3_EXTRACTOR_H_
18
19#define MP3_EXTRACTOR_H_
20
21#include <media/stagefright/MediaExtractor.h>
22
23namespace android {
24
25struct AMessage;
26class DataSource;
27struct MP3Seeker;
28class String8;
29
30class MP3Extractor : public MediaExtractor {
31public:
32    // Extractor assumes ownership of "source".
33    MP3Extractor(const sp<DataSource> &source, const sp<AMessage> &meta);
34
35    virtual size_t countTracks();
36    virtual sp<MediaSource> getTrack(size_t index);
37    virtual sp<MetaData> getTrackMetaData(size_t index, uint32_t flags);
38
39    virtual sp<MetaData> getMetaData();
40
41    static bool get_mp3_frame_size(
42            uint32_t header, size_t *frame_size,
43            int *out_sampling_rate = NULL, int *out_channels = NULL,
44            int *out_bitrate = NULL);
45
46private:
47    status_t mInitCheck;
48
49    sp<DataSource> mDataSource;
50    off_t mFirstFramePos;
51    sp<MetaData> mMeta;
52    uint32_t mFixedHeader;
53    sp<MP3Seeker> mSeeker;
54
55    MP3Extractor(const MP3Extractor &);
56    MP3Extractor &operator=(const MP3Extractor &);
57};
58
59bool SniffMP3(
60        const sp<DataSource> &source, String8 *mimeType, float *confidence,
61        sp<AMessage> *meta);
62
63}  // namespace android
64
65#endif  // MP3_EXTRACTOR_H_
66