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 24 namespace android { 25 26 struct AMessage; 27 class DataSource; 28 class SampleTable; 29 class String8; 30 31 class MPEG4Extractor : public MediaExtractor { 32 public: 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 42 protected: 43 virtual ~MPEG4Extractor(); 44 45 private: 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 status_t parseTrackHeader(off_t data_offset, off_t data_size); 75 76 MPEG4Extractor(const MPEG4Extractor &); 77 MPEG4Extractor &operator=(const MPEG4Extractor &); 78 }; 79 80 bool SniffMPEG4( 81 const sp<DataSource> &source, String8 *mimeType, float *confidence, 82 sp<AMessage> *); 83 84 } // namespace android 85 86 #endif // MPEG4_EXTRACTOR_H_ 87