1 /* 2 * Copyright (C) 2010 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 A_TS_PARSER_H_ 18 19 #define A_TS_PARSER_H_ 20 21 #include <sys/types.h> 22 23 #include <media/stagefright/foundation/ABase.h> 24 #include <media/stagefright/foundation/AMessage.h> 25 #include <utils/KeyedVector.h> 26 #include <utils/Vector.h> 27 #include <utils/RefBase.h> 28 29 namespace android { 30 31 struct ABitReader; 32 struct ABuffer; 33 struct MediaSource; 34 35 struct ATSParser : public RefBase { 36 enum DiscontinuityType { 37 DISCONTINUITY_NONE = 0, 38 DISCONTINUITY_TIME = 1, 39 DISCONTINUITY_AUDIO_FORMAT = 2, 40 DISCONTINUITY_VIDEO_FORMAT = 4, 41 DISCONTINUITY_ABSOLUTE_TIME = 8, 42 DISCONTINUITY_TIME_OFFSET = 16, 43 44 // For legacy reasons this also implies a time discontinuity. 45 DISCONTINUITY_FORMATCHANGE = 46 DISCONTINUITY_AUDIO_FORMAT 47 | DISCONTINUITY_VIDEO_FORMAT 48 | DISCONTINUITY_TIME, 49 }; 50 51 enum Flags { 52 // The 90kHz clock (PTS/DTS) is absolute, i.e. PTS=0 corresponds to 53 // a media time of 0. 54 // If this flag is _not_ specified, the first PTS encountered in a 55 // program of this stream will be assumed to correspond to media time 0 56 // instead. 57 TS_TIMESTAMPS_ARE_ABSOLUTE = 1, 58 // Video PES packets contain exactly one (aligned) access unit. 59 ALIGNED_VIDEO_DATA = 2, 60 }; 61 62 ATSParser(uint32_t flags = 0); 63 64 status_t feedTSPacket(const void *data, size_t size); 65 66 void signalDiscontinuity( 67 DiscontinuityType type, const sp<AMessage> &extra); 68 69 void signalEOS(status_t finalResult); 70 71 enum SourceType { 72 VIDEO = 0, 73 AUDIO = 1, 74 NUM_SOURCE_TYPES = 2 75 }; 76 sp<MediaSource> getSource(SourceType type); 77 bool hasSource(SourceType type) const; 78 79 bool PTSTimeDeltaEstablished(); 80 81 enum { 82 // From ISO/IEC 13818-1: 2000 (E), Table 2-29 83 STREAMTYPE_RESERVED = 0x00, 84 STREAMTYPE_MPEG1_VIDEO = 0x01, 85 STREAMTYPE_MPEG2_VIDEO = 0x02, 86 STREAMTYPE_MPEG1_AUDIO = 0x03, 87 STREAMTYPE_MPEG2_AUDIO = 0x04, 88 STREAMTYPE_MPEG2_AUDIO_ADTS = 0x0f, 89 STREAMTYPE_MPEG4_VIDEO = 0x10, 90 STREAMTYPE_H264 = 0x1b, 91 92 // From ATSC A/53 Part 3:2009, 6.7.1 93 STREAMTYPE_AC3 = 0x81, 94 95 // Stream type 0x83 is non-standard, 96 // it could be LPCM or TrueHD AC3 97 STREAMTYPE_LPCM_AC3 = 0x83, 98 }; 99 100 protected: 101 virtual ~ATSParser(); 102 103 private: 104 struct Program; 105 struct Stream; 106 struct PSISection; 107 108 uint32_t mFlags; 109 Vector<sp<Program> > mPrograms; 110 111 // Keyed by PID 112 KeyedVector<unsigned, sp<PSISection> > mPSISections; 113 114 int64_t mAbsoluteTimeAnchorUs; 115 116 bool mTimeOffsetValid; 117 int64_t mTimeOffsetUs; 118 119 size_t mNumTSPacketsParsed; 120 121 void parseProgramAssociationTable(ABitReader *br); 122 void parseProgramMap(ABitReader *br); 123 void parsePES(ABitReader *br); 124 125 status_t parsePID( 126 ABitReader *br, unsigned PID, 127 unsigned continuity_counter, 128 unsigned payload_unit_start_indicator); 129 130 void parseAdaptationField(ABitReader *br, unsigned PID); 131 status_t parseTS(ABitReader *br); 132 133 void updatePCR(unsigned PID, uint64_t PCR, size_t byteOffsetFromStart); 134 135 uint64_t mPCR[2]; 136 size_t mPCRBytes[2]; 137 int64_t mSystemTimeUs[2]; 138 size_t mNumPCRs; 139 140 DISALLOW_EVIL_CONSTRUCTORS(ATSParser); 141 }; 142 143 } // namespace android 144 145 #endif // A_TS_PARSER_H_ 146
