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
23namespace android {
24
25struct NuPlayer::CCDecoder : public RefBase {
26    enum {
27        kWhatClosedCaptionData,
28        kWhatTrackAdded,
29    };
30
31    enum {
32        kTrackTypeCEA608,
33        kTrackTypeCEA708,
34    };
35
36    CCDecoder(const sp<AMessage> &notify);
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
46private:
47    // CC track identifier.
48    struct CCTrack {
49        CCTrack() : mTrackType(0), mTrackChannel(0) { }
50
51        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