1 /* 2 * Copyright 2012, 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 TS_PACKETIZER_H_ 18 19 #define TS_PACKETIZER_H_ 20 21 #include <media/stagefright/foundation/ABase.h> 22 #include <utils/Errors.h> 23 #include <utils/RefBase.h> 24 #include <utils/Vector.h> 25 26 namespace android { 27 28 struct ABuffer; 29 struct AMessage; 30 31 // Forms the packets of a transport stream given access units. 32 // Emits metadata tables (PAT and PMT) and timestamp stream (PCR) based 33 // on flags. 34 struct TSPacketizer : public RefBase { 35 enum { 36 EMIT_HDCP20_DESCRIPTOR = 1, 37 EMIT_HDCP21_DESCRIPTOR = 2, 38 }; 39 TSPacketizer(uint32_t flags); 40 41 // Returns trackIndex or error. 42 ssize_t addTrack(const sp<AMessage> &format); 43 44 enum { 45 EMIT_PAT_AND_PMT = 1, 46 EMIT_PCR = 2, 47 IS_ENCRYPTED = 4, 48 PREPEND_SPS_PPS_TO_IDR_FRAMES = 8, 49 }; 50 status_t packetize( 51 size_t trackIndex, const sp<ABuffer> &accessUnit, 52 sp<ABuffer> *packets, 53 uint32_t flags, 54 const uint8_t *PES_private_data, size_t PES_private_data_len, 55 size_t numStuffingBytes = 0); 56 57 status_t extractCSDIfNecessary(size_t trackIndex); 58 59 // XXX to be removed once encoder config option takes care of this for 60 // encrypted mode. 61 sp<ABuffer> prependCSD( 62 size_t trackIndex, const sp<ABuffer> &accessUnit) const; 63 64 protected: 65 virtual ~TSPacketizer(); 66 67 private: 68 enum { 69 kPID_PMT = 0x100, 70 kPID_PCR = 0x1000, 71 }; 72 73 struct Track; 74 75 uint32_t mFlags; 76 Vector<sp<Track> > mTracks; 77 78 Vector<sp<ABuffer> > mProgramInfoDescriptors; 79 80 unsigned mPATContinuityCounter; 81 unsigned mPMTContinuityCounter; 82 83 uint32_t mCrcTable[256]; 84 85 void initCrcTable(); 86 uint32_t crc32(const uint8_t *start, size_t size) const; 87 88 DISALLOW_EVIL_CONSTRUCTORS(TSPacketizer); 89 }; 90 91 } // namespace android 92 93 #endif // TS_PACKETIZER_H_ 94 95
