1 /* 2 * Copyright 2014 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 NUPLAYER_CCDECODER_H_ 18 19 #define NUPLAYER_CCDECODER_H_ 20 21 #include "NuPlayer.h" 22 23 namespace android { 24 25 struct NuPlayer::CCDecoder : public RefBase { 26 enum { 27 kWhatClosedCaptionData, 28 kWhatTrackAdded, 29 }; 30 31 enum { 32 kTrackTypeCEA608, 33 kTrackTypeCEA708, 34 }; 35 36 explicit CCDecoder(const sp<AMessage> ¬ify); 37 38 size_t getTrackCount() const; 39 sp<AMessage> getTrackInfo(size_t index) const; 40 status_t selectTrack(size_t index, bool select); 41 bool isSelected() const; 42 void decode(const sp<ABuffer> &accessUnit); 43 void display(int64_t timeUs); 44 void flush(); 45 46 private: 47 // CC track identifier. 48 struct CCTrack { CCTrackCCDecoder::CCTrack49 CCTrack() : mTrackType(0), mTrackChannel(0) { } 50 CCTrackCCDecoder::CCTrack51 CCTrack(const int32_t trackType, const size_t trackChannel) 52 : mTrackType(trackType), mTrackChannel(trackChannel) { } 53 54 int32_t mTrackType; 55 size_t mTrackChannel; 56 57 // The ordering of CCTracks is to build a map of track to index. 58 // It is necessary to find the index of the matched CCTrack when CC data comes. 59 int compare(const NuPlayer::CCDecoder::CCTrack& rhs) const; 60 inline bool operator<(const NuPlayer::CCDecoder::CCTrack& rhs) const; 61 inline bool operator==(const NuPlayer::CCDecoder::CCTrack& rhs) const; 62 inline bool operator!=(const NuPlayer::CCDecoder::CCTrack& rhs) const; 63 }; 64 65 sp<AMessage> mNotify; 66 KeyedVector<int64_t, sp<ABuffer> > mCCMap; 67 ssize_t mSelectedTrack; 68 KeyedVector<CCTrack, size_t> mTrackIndices; 69 Vector<CCTrack> mTracks; 70 71 // CEA-608 closed caption 72 size_t mLine21Channels[2]; // The current channels of NTSC_CC_FIELD_{1, 2} 73 74 // CEA-708 closed caption 75 sp<ABuffer> mDTVCCPacket; 76 77 bool isTrackValid(size_t index) const; 78 size_t getTrackIndex(int32_t trackType, size_t channel, bool *trackAdded); 79 80 // Extract from H.264 SEIs 81 bool extractFromSEI(const sp<ABuffer> &accessUnit); 82 bool parseSEINalUnit(int64_t timeUs, const uint8_t *data, size_t size); 83 84 // Extract from MPEG user data 85 bool extractFromMPEGUserData(const sp<ABuffer> &accessUnit); 86 bool parseMPEGUserDataUnit(int64_t timeUs, const uint8_t *data, size_t size); 87 88 // Extract CC tracks from MPEG_cc_data 89 bool parseMPEGCCData(int64_t timeUs, const uint8_t *data, size_t size); 90 bool parseDTVCCPacket(int64_t timeUs, const uint8_t *data, size_t size); 91 92 DISALLOW_EVIL_CONSTRUCTORS(CCDecoder); 93 }; 94 95 } // namespace android 96 97 #endif // NUPLAYER_CCDECODER_H_ 98