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
29namespace android {
30
31struct ABitReader;
32struct ABuffer;
33struct MediaSource;
34
35struct 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
93protected:
94    virtual ~ATSParser();
95
96private:
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