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 DISCONTINUITY_SEEK = DISCONTINUITY_TIME, 45 46 // For legacy reasons this also implies a time discontinuity. 47 DISCONTINUITY_FORMATCHANGE = 48 DISCONTINUITY_AUDIO_FORMAT 49 | DISCONTINUITY_VIDEO_FORMAT 50 | DISCONTINUITY_TIME, 51 }; 52 53 enum Flags { 54 // The 90kHz clock (PTS/DTS) is absolute, i.e. PTS=0 corresponds to 55 // a media time of 0. 56 // If this flag is _not_ specified, the first PTS encountered in a 57 // program of this stream will be assumed to correspond to media time 0 58 // instead. 59 TS_TIMESTAMPS_ARE_ABSOLUTE = 1, 60 // Video PES packets contain exactly one (aligned) access unit. 61 ALIGNED_VIDEO_DATA = 2, 62 }; 63 64 ATSParser(uint32_t flags = 0); 65 66 status_t feedTSPacket(const void *data, size_t size); 67 68 void signalDiscontinuity( 69 DiscontinuityType type, const sp<AMessage> &extra); 70 71 void signalEOS(status_t finalResult); 72 73 enum SourceType { 74 VIDEO = 0, 75 AUDIO = 1, 76 NUM_SOURCE_TYPES = 2 77 }; 78 sp<MediaSource> getSource(SourceType type); 79 80 bool PTSTimeDeltaEstablished(); 81 82 enum { 83 // From ISO/IEC 13818-1: 2000 (E), Table 2-29 84 STREAMTYPE_RESERVED = 0x00, 85 STREAMTYPE_MPEG1_VIDEO = 0x01, 86 STREAMTYPE_MPEG2_VIDEO = 0x02, 87 STREAMTYPE_MPEG1_AUDIO = 0x03, 88 STREAMTYPE_MPEG2_AUDIO = 0x04, 89 STREAMTYPE_MPEG2_AUDIO_ADTS = 0x0f, 90 STREAMTYPE_MPEG4_VIDEO = 0x10, 91 STREAMTYPE_H264 = 0x1b, 92 STREAMTYPE_PCM_AUDIO = 0x83, 93 }; 94 95 protected: 96 virtual ~ATSParser(); 97 98 private: 99 struct Program; 100 struct Stream; 101 struct PSISection; 102 103 uint32_t mFlags; 104 Vector<sp<Program> > mPrograms; 105 106 // Keyed by PID 107 KeyedVector<unsigned, sp<PSISection> > mPSISections; 108 109 int64_t mAbsoluteTimeAnchorUs; 110 111 bool mTimeOffsetValid; 112 int64_t mTimeOffsetUs; 113 114 size_t mNumTSPacketsParsed; 115 116 void parseProgramAssociationTable(ABitReader *br); 117 void parseProgramMap(ABitReader *br); 118 void parsePES(ABitReader *br); 119 120 status_t parsePID( 121 ABitReader *br, unsigned PID, 122 unsigned continuity_counter, 123 unsigned payload_unit_start_indicator); 124 125 void parseAdaptationField(ABitReader *br, unsigned PID); 126 status_t parseTS(ABitReader *br); 127 128 void updatePCR(unsigned PID, uint64_t PCR, size_t byteOffsetFromStart); 129 130 uint64_t mPCR[2]; 131 size_t mPCRBytes[2]; 132 int64_t mSystemTimeUs[2]; 133 size_t mNumPCRs; 134 135 DISALLOW_EVIL_CONSTRUCTORS(ATSParser); 136 }; 137 138 } // namespace android 139 140 #endif // A_TS_PARSER_H_ 141
