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 43 DISCONTINUITY_SEEK = DISCONTINUITY_TIME, 44 45 // For legacy reasons this also implies a time discontinuity. 46 DISCONTINUITY_FORMATCHANGE = 47 DISCONTINUITY_AUDIO_FORMAT 48 | DISCONTINUITY_VIDEO_FORMAT 49 | DISCONTINUITY_TIME, 50 }; 51 52 enum Flags { 53 // The 90kHz clock (PTS/DTS) is absolute, i.e. PTS=0 corresponds to 54 // a media time of 0. 55 // If this flag is _not_ specified, the first PTS encountered in a 56 // program of this stream will be assumed to correspond to media time 0 57 // instead. 58 TS_TIMESTAMPS_ARE_ABSOLUTE = 1, 59 // Video PES packets contain exactly one (aligned) access unit. 60 ALIGNED_VIDEO_DATA = 2, 61 }; 62 63 ATSParser(uint32_t flags = 0); 64 65 status_t feedTSPacket(const void *data, size_t size); 66 67 void signalDiscontinuity( 68 DiscontinuityType type, const sp<AMessage> &extra); 69 70 void signalEOS(status_t finalResult); 71 72 enum SourceType { 73 VIDEO, 74 AUDIO 75 }; 76 sp<MediaSource> getSource(SourceType type); 77 78 bool PTSTimeDeltaEstablished(); 79 80 enum { 81 // From ISO/IEC 13818-1: 2000 (E), Table 2-29 82 STREAMTYPE_RESERVED = 0x00, 83 STREAMTYPE_MPEG1_VIDEO = 0x01, 84 STREAMTYPE_MPEG2_VIDEO = 0x02, 85 STREAMTYPE_MPEG1_AUDIO = 0x03, 86 STREAMTYPE_MPEG2_AUDIO = 0x04, 87 STREAMTYPE_MPEG2_AUDIO_ADTS = 0x0f, 88 STREAMTYPE_MPEG4_VIDEO = 0x10, 89 STREAMTYPE_H264 = 0x1b, 90 STREAMTYPE_PCM_AUDIO = 0x83, 91 }; 92 93 protected: 94 virtual ~ATSParser(); 95 96 private: 97 struct Program; 98 struct Stream; 99 struct PSISection; 100 101 uint32_t mFlags; 102 Vector<sp<Program> > mPrograms; 103 104 // Keyed by PID 105 KeyedVector<unsigned, sp<PSISection> > mPSISections; 106 107 int64_t mAbsoluteTimeAnchorUs; 108 109 size_t mNumTSPacketsParsed; 110 111 void parseProgramAssociationTable(ABitReader *br); 112 void parseProgramMap(ABitReader *br); 113 void parsePES(ABitReader *br); 114 115 status_t parsePID( 116 ABitReader *br, unsigned PID, 117 unsigned continuity_counter, 118 unsigned payload_unit_start_indicator); 119 120 void parseAdaptationField(ABitReader *br, unsigned PID); 121 status_t parseTS(ABitReader *br); 122 123 void updatePCR(unsigned PID, uint64_t PCR, size_t byteOffsetFromStart); 124 125 uint64_t mPCR[2]; 126 size_t mPCRBytes[2]; 127 int64_t mSystemTimeUs[2]; 128 size_t mNumPCRs; 129 130 DISALLOW_EVIL_CONSTRUCTORS(ATSParser); 131 }; 132 133 } // namespace android 134 135 #endif // A_TS_PARSER_H_ 136