ATSParser.h revision 06528d7f18ad01377357d337eaa3e875a242bd2d 
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/Vector.h>
26#include <utils/RefBase.h>
27
28namespace android {
29
30struct ABitReader;
31struct ABuffer;
32struct MediaSource;
33
34struct ATSParser : public RefBase {
35    enum DiscontinuityType {
36        DISCONTINUITY_NONE,
37        DISCONTINUITY_SEEK,
38        DISCONTINUITY_FORMATCHANGE
39    };
40
41    enum Flags {
42        // The 90kHz clock (PTS/DTS) is absolute, i.e. PTS=0 corresponds to
43        // a media time of 0.
44        // If this flag is _not_ specified, the first PTS encountered in a
45        // program of this stream will be assumed to correspond to media time 0
46        // instead.
47        TS_TIMESTAMPS_ARE_ABSOLUTE = 1
48    };
49
50    ATSParser(uint32_t flags = 0);
51
52    status_t feedTSPacket(const void *data, size_t size);
53
54    void signalDiscontinuity(
55            DiscontinuityType type, const sp<AMessage> &extra);
56
57    void signalEOS(status_t finalResult);
58
59    enum SourceType {
60        VIDEO,
61        AUDIO
62    };
63    sp<MediaSource> getSource(SourceType type);
64
65    bool PTSTimeDeltaEstablished();
66
67protected:
68    virtual ~ATSParser();
69
70private:
71    enum {
72        // From ISO/IEC 13818-1: 2000 (E), Table 2-29
73        STREAMTYPE_MPEG1_VIDEO          = 0x01,
74        STREAMTYPE_MPEG2_VIDEO          = 0x02,
75        STREAMTYPE_MPEG1_AUDIO          = 0x03,
76        STREAMTYPE_MPEG2_AUDIO          = 0x04,
77        STREAMTYPE_MPEG2_AUDIO_ATDS     = 0x0f,
78        STREAMTYPE_MPEG4_VIDEO          = 0x10,
79        STREAMTYPE_H264                 = 0x1b,
80    };
81
82    struct Program;
83    struct Stream;
84
85    uint32_t mFlags;
86    Vector<sp<Program> > mPrograms;
87
88    void parseProgramAssociationTable(ABitReader *br);
89    void parseProgramMap(ABitReader *br);
90    void parsePES(ABitReader *br);
91
92    status_t parsePID(
93        ABitReader *br, unsigned PID,
94        unsigned payload_unit_start_indicator);
95
96    void parseAdaptationField(ABitReader *br);
97    status_t parseTS(ABitReader *br);
98
99    DISALLOW_EVIL_CONSTRUCTORS(ATSParser);
100};
101
102}  // namespace android
103
104#endif  // A_TS_PARSER_H_
105