MP3Extractor.h revision 95d7e994c73c17b27c7134ba3cc3acbb5889aa87 
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 <utils/Errors.h>
22#include <media/stagefright/MediaExtractor.h>
23
24namespace android {
25
26struct AMessage;
27class DataSource;
28struct MP3Seeker;
29class String8;
30
31class MP3Extractor : public MediaExtractor {
32public:
33    // Extractor assumes ownership of "source".
34    MP3Extractor(const sp<DataSource> &source, const sp<AMessage> &meta);
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
42    static bool get_mp3_frame_size(
43            uint32_t header, size_t *frame_size,
44            int *out_sampling_rate = NULL, int *out_channels = NULL,
45            int *out_bitrate = NULL);
46
47private:
48    status_t mInitCheck;
49
50    sp<DataSource> mDataSource;
51    off64_t mFirstFramePos;
52    sp<MetaData> mMeta;
53    uint32_t mFixedHeader;
54    sp<MP3Seeker> mSeeker;
55
56    MP3Extractor(const MP3Extractor &);
57    MP3Extractor &operator=(const MP3Extractor &);
58};
59
60bool SniffMP3(
61        const sp<DataSource> &source, String8 *mimeType, float *confidence,
62        sp<AMessage> *meta);
63
64}  // namespace android
65
66#endif  // MP3_EXTRACTOR_H_
67