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 ssize_t getSelectedTrack(media_track_type type) const; 42 bool isSelected() const; 43 void decode(const sp<ABuffer> &accessUnit); 44 void display(int64_t timeUs); 45 void flush(); 46 47 private: 48 // CC track identifier. 49 struct CCTrack { CCTrackCCDecoder::CCTrack50 CCTrack() : mTrackType(0), mTrackChannel(0) { } 51 CCTrackCCDecoder::CCTrack52 CCTrack(const int32_t trackType, const size_t trackChannel) 53 : mTrackType(trackType), mTrackChannel(trackChannel) { } 54 55 int32_t mTrackType; 56 size_t mTrackChannel; 57 58 // The ordering of CCTracks is to build a map of track to index. 59 // It is necessary to find the index of the matched CCTrack when CC data comes. 60 int compare(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 inline bool operator!=(const NuPlayer::CCDecoder::CCTrack& rhs) const; 64 }; 65 66 sp<AMessage> mNotify; 67 KeyedVector<int64_t, sp<ABuffer> > mCCMap; 68 ssize_t mSelectedTrack; 69 KeyedVector<CCTrack, size_t> mTrackIndices; 70 Vector<CCTrack> mTracks; 71 72 // CEA-608 closed caption 73 size_t mLine21Channels[2]; // The current channels of NTSC_CC_FIELD_{1, 2} 74 75 // CEA-708 closed caption 76 sp<ABuffer> mDTVCCPacket; 77 78 bool isTrackValid(size_t index) const; 79 size_t getTrackIndex(int32_t trackType, size_t channel, bool *trackAdded); 80 81 // Extract from H.264 SEIs 82 bool extractFromSEI(const sp<ABuffer> &accessUnit); 83 bool parseSEINalUnit(int64_t timeUs, const uint8_t *data, size_t size); 84 85 // Extract from MPEG user data 86 bool extractFromMPEGUserData(const sp<ABuffer> &accessUnit); 87 bool parseMPEGUserDataUnit(int64_t timeUs, const uint8_t *data, size_t size); 88 89 // Extract CC tracks from MPEG_cc_data 90 bool parseMPEGCCData(int64_t timeUs, const uint8_t *data, size_t size); 91 bool parseDTVCCPacket(int64_t timeUs, const uint8_t *data, size_t size); 92 93 DISALLOW_EVIL_CONSTRUCTORS(CCDecoder); 94 }; 95 96 } // namespace android 97 98 #endif // NUPLAYER_CCDECODER_H_ 99