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 <media/stagefright/MediaSource.h>
26#include <utils/KeyedVector.h>
27#include <utils/Vector.h>
28#include <utils/RefBase.h>
29#include <vector>
30
31namespace android {
32namespace media {
33class ICas;
34class IDescrambler;
35};
36using namespace media;
37class ABitReader;
38struct ABuffer;
39struct AnotherPacketSource;
40
41struct ATSParser : public RefBase {
42    enum DiscontinuityType {
43        DISCONTINUITY_NONE              = 0,
44        DISCONTINUITY_TIME              = 1,
45        DISCONTINUITY_AUDIO_FORMAT      = 2,
46        DISCONTINUITY_VIDEO_FORMAT      = 4,
47        DISCONTINUITY_ABSOLUTE_TIME     = 8,
48        DISCONTINUITY_TIME_OFFSET       = 16,
49
50        // For legacy reasons this also implies a time discontinuity.
51        DISCONTINUITY_FORMATCHANGE      =
52            DISCONTINUITY_AUDIO_FORMAT
53                | DISCONTINUITY_VIDEO_FORMAT
54                | DISCONTINUITY_TIME,
55        DISCONTINUITY_FORMAT_ONLY       =
56            DISCONTINUITY_AUDIO_FORMAT
57                | DISCONTINUITY_VIDEO_FORMAT,
58    };
59
60    enum Flags {
61        // The 90kHz clock (PTS/DTS) is absolute, i.e. PTS=0 corresponds to
62        // a media time of 0.
63        // If this flag is _not_ specified, the first PTS encountered in a
64        // program of this stream will be assumed to correspond to media time 0
65        // instead.
66        TS_TIMESTAMPS_ARE_ABSOLUTE = 1,
67        // Video PES packets contain exactly one (aligned) access unit.
68        ALIGNED_VIDEO_DATA         = 2,
69    };
70
71    enum SourceType {
72        VIDEO = 0,
73        AUDIO = 1,
74        META  = 2,
75        NUM_SOURCE_TYPES = 3
76    };
77
78    // Event is used to signal sync point event at feedTSPacket().
79    struct SyncEvent {
80        explicit SyncEvent(off64_t offset);
81
82        void init(off64_t offset, const sp<MediaSource> &source,
83                int64_t timeUs, SourceType type);
84
85        bool hasReturnedData() const { return mHasReturnedData; }
86        void reset();
87        off64_t getOffset() const { return mOffset; }
88        const sp<MediaSource> &getMediaSource() const { return mMediaSource; }
89        int64_t getTimeUs() const { return mTimeUs; }
90        SourceType getType() const { return mType; }
91
92    private:
93        bool mHasReturnedData;
94        /*
95         * mHasReturnedData == false: the current offset (or undefined if the returned data
96                                      has been invalidated via reset())
97         * mHasReturnedData == true: the start offset of sync payload
98         */
99        off64_t mOffset;
100        /* The media source object for this event. */
101        sp<MediaSource> mMediaSource;
102        /* The timestamp of the sync frame. */
103        int64_t mTimeUs;
104        SourceType mType;
105    };
106
107    explicit ATSParser(uint32_t flags = 0);
108
109    status_t setMediaCas(const sp<ICas> &cas);
110
111    // Feed a TS packet into the parser. uninitialized event with the start
112    // offset of this TS packet goes in, and if the parser detects PES with
113    // a sync frame, the event will be initiailzed with the start offset of the
114    // PES. Note that the offset of the event can be different from what we fed,
115    // as a PES may consist of multiple TS packets.
116    //
117    // Even in the case feedTSPacket() returns non-OK value, event still may be
118    // initialized if the parsing failed after the detection.
119    status_t feedTSPacket(
120            const void *data, size_t size, SyncEvent *event = NULL);
121
122    void signalDiscontinuity(
123            DiscontinuityType type, const sp<AMessage> &extra);
124
125    void signalEOS(status_t finalResult);
126
127    sp<MediaSource> getSource(SourceType type);
128    bool hasSource(SourceType type) const;
129
130    bool PTSTimeDeltaEstablished();
131
132    int64_t getFirstPTSTimeUs();
133
134    void signalNewSampleAesKey(const sp<AMessage> &keyItem);
135
136    enum {
137        // From ISO/IEC 13818-1: 2000 (E), Table 2-29
138        STREAMTYPE_RESERVED             = 0x00,
139        STREAMTYPE_MPEG1_VIDEO          = 0x01,
140        STREAMTYPE_MPEG2_VIDEO          = 0x02,
141        STREAMTYPE_MPEG1_AUDIO          = 0x03,
142        STREAMTYPE_MPEG2_AUDIO          = 0x04,
143        STREAMTYPE_MPEG2_AUDIO_ADTS     = 0x0f,
144        STREAMTYPE_MPEG4_VIDEO          = 0x10,
145        STREAMTYPE_METADATA             = 0x15,
146        STREAMTYPE_H264                 = 0x1b,
147
148        // From ATSC A/53 Part 3:2009, 6.7.1
149        STREAMTYPE_AC3                  = 0x81,
150
151        // Stream type 0x83 is non-standard,
152        // it could be LPCM or TrueHD AC3
153        STREAMTYPE_LPCM_AC3             = 0x83,
154
155        //Sample Encrypted types
156        STREAMTYPE_H264_ENCRYPTED       = 0xDB,
157        STREAMTYPE_AAC_ENCRYPTED        = 0xCF,
158        STREAMTYPE_AC3_ENCRYPTED        = 0xC1,
159    };
160
161protected:
162    virtual ~ATSParser();
163
164private:
165    struct Program;
166    struct Stream;
167    struct PSISection;
168    struct CasManager;
169    struct CADescriptor {
170        int32_t mSystemID;
171        unsigned mPID;
172        std::vector<uint8_t> mPrivateData;
173    };
174
175    sp<CasManager> mCasManager;
176
177    uint32_t mFlags;
178    Vector<sp<Program> > mPrograms;
179
180    // Keyed by PID
181    KeyedVector<unsigned, sp<PSISection> > mPSISections;
182
183    int64_t mAbsoluteTimeAnchorUs;
184
185    bool mTimeOffsetValid;
186    int64_t mTimeOffsetUs;
187    int64_t mLastRecoveredPTS;
188
189    size_t mNumTSPacketsParsed;
190
191    sp<AMessage> mSampleAesKeyItem;
192
193    void parseProgramAssociationTable(ABitReader *br);
194    void parseProgramMap(ABitReader *br);
195    // Parse PES packet where br is pointing to. If the PES contains a sync
196    // frame, set event with the time and the start offset of this PES.
197    // Note that the method itself does not touch event.
198    void parsePES(ABitReader *br, SyncEvent *event);
199
200    // Strip remaining packet headers and pass to appropriate program/stream
201    // to parse the payload. If the payload turns out to be PES and contains
202    // a sync frame, event shall be set with the time and start offset of the
203    // PES.
204    // Note that the method itself does not touch event.
205    status_t parsePID(
206        ABitReader *br, unsigned PID,
207        unsigned continuity_counter,
208        unsigned payload_unit_start_indicator,
209        unsigned transport_scrambling_control,
210        unsigned random_access_indicator,
211        SyncEvent *event);
212
213    status_t parseAdaptationField(
214            ABitReader *br, unsigned PID, unsigned *random_access_indicator);
215
216    // see feedTSPacket().
217    status_t parseTS(ABitReader *br, SyncEvent *event);
218
219    void updatePCR(unsigned PID, uint64_t PCR, uint64_t byteOffsetFromStart);
220
221    uint64_t mPCR[2];
222    uint64_t mPCRBytes[2];
223    int64_t mSystemTimeUs[2];
224    size_t mNumPCRs;
225
226    DISALLOW_EVIL_CONSTRUCTORS(ATSParser);
227};
228
229}  // namespace android
230
231#endif  // A_TS_PARSER_H_
232