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/MediaSource.h>
24#include <media/stagefright/foundation/ABase.h>
25#include <media/stagefright/foundation/AMessage.h>
26#include <utils/KeyedVector.h>
27#include <utils/Vector.h>
28#include <utils/RefBase.h>
29#include <vector>
30
31namespace android {
32namespace hardware {
33namespace cas {
34namespace V1_0 {
35struct ICas;
36}}}
37using hardware::cas::V1_0::ICas;
38
39class ABitReader;
40struct ABuffer;
41struct AnotherPacketSource;
42
43struct ATSParser : public RefBase {
44    enum DiscontinuityType {
45        DISCONTINUITY_NONE              = 0,
46        DISCONTINUITY_TIME              = 1,
47        DISCONTINUITY_AUDIO_FORMAT      = 2,
48        DISCONTINUITY_VIDEO_FORMAT      = 4,
49        DISCONTINUITY_ABSOLUTE_TIME     = 8,
50        DISCONTINUITY_TIME_OFFSET       = 16,
51
52        // For legacy reasons this also implies a time discontinuity.
53        DISCONTINUITY_FORMATCHANGE      =
54            DISCONTINUITY_AUDIO_FORMAT
55                | DISCONTINUITY_VIDEO_FORMAT
56                | DISCONTINUITY_TIME,
57        DISCONTINUITY_FORMAT_ONLY       =
58            DISCONTINUITY_AUDIO_FORMAT
59                | DISCONTINUITY_VIDEO_FORMAT,
60    };
61
62    enum Flags {
63        // The 90kHz clock (PTS/DTS) is absolute, i.e. PTS=0 corresponds to
64        // a media time of 0.
65        // If this flag is _not_ specified, the first PTS encountered in a
66        // program of this stream will be assumed to correspond to media time 0
67        // instead.
68        TS_TIMESTAMPS_ARE_ABSOLUTE = 1,
69        // Video PES packets contain exactly one (aligned) access unit.
70        ALIGNED_VIDEO_DATA         = 2,
71    };
72
73    enum SourceType {
74        VIDEO = 0,
75        AUDIO = 1,
76        META  = 2,
77        NUM_SOURCE_TYPES = 3
78    };
79
80    // Event is used to signal sync point event at feedTSPacket().
81    struct SyncEvent {
82        explicit SyncEvent(off64_t offset);
83
84        void init(off64_t offset, const sp<AnotherPacketSource> &source,
85                int64_t timeUs, SourceType type);
86
87        bool hasReturnedData() const { return mHasReturnedData; }
88        void reset();
89        off64_t getOffset() const { return mOffset; }
90        const sp<AnotherPacketSource> &getMediaSource() const { return mMediaSource; }
91        int64_t getTimeUs() const { return mTimeUs; }
92        SourceType getType() const { return mType; }
93
94    private:
95        bool mHasReturnedData;
96        /*
97         * mHasReturnedData == false: the current offset (or undefined if the returned data
98                                      has been invalidated via reset())
99         * mHasReturnedData == true: the start offset of sync payload
100         */
101        off64_t mOffset;
102        /* The media source object for this event. */
103        sp<AnotherPacketSource> mMediaSource;
104        /* The timestamp of the sync frame. */
105        int64_t mTimeUs;
106        SourceType mType;
107    };
108
109    explicit ATSParser(uint32_t flags = 0);
110
111    status_t setMediaCas(const sp<ICas> &cas);
112
113    // Feed a TS packet into the parser. uninitialized event with the start
114    // offset of this TS packet goes in, and if the parser detects PES with
115    // a sync frame, the event will be initiailzed with the start offset of the
116    // PES. Note that the offset of the event can be different from what we fed,
117    // as a PES may consist of multiple TS packets.
118    //
119    // Even in the case feedTSPacket() returns non-OK value, event still may be
120    // initialized if the parsing failed after the detection.
121    status_t feedTSPacket(
122            const void *data, size_t size, SyncEvent *event = NULL);
123
124    void signalDiscontinuity(
125            DiscontinuityType type, const sp<AMessage> &extra);
126
127    void signalEOS(status_t finalResult);
128
129    sp<AnotherPacketSource> getSource(SourceType type);
130    bool hasSource(SourceType type) const;
131
132    bool PTSTimeDeltaEstablished();
133
134    int64_t getFirstPTSTimeUs();
135
136    void signalNewSampleAesKey(const sp<AMessage> &keyItem);
137
138    enum {
139        // From ISO/IEC 13818-1: 2000 (E), Table 2-29
140        STREAMTYPE_RESERVED             = 0x00,
141        STREAMTYPE_MPEG1_VIDEO          = 0x01,
142        STREAMTYPE_MPEG2_VIDEO          = 0x02,
143        STREAMTYPE_MPEG1_AUDIO          = 0x03,
144        STREAMTYPE_MPEG2_AUDIO          = 0x04,
145        STREAMTYPE_MPEG2_AUDIO_ADTS     = 0x0f,
146        STREAMTYPE_MPEG4_VIDEO          = 0x10,
147        STREAMTYPE_METADATA             = 0x15,
148        STREAMTYPE_H264                 = 0x1b,
149
150        // From ATSC A/53 Part 3:2009, 6.7.1
151        STREAMTYPE_AC3                  = 0x81,
152
153        // Stream type 0x83 is non-standard,
154        // it could be LPCM or TrueHD AC3
155        STREAMTYPE_LPCM_AC3             = 0x83,
156
157        //Sample Encrypted types
158        STREAMTYPE_H264_ENCRYPTED       = 0xDB,
159        STREAMTYPE_AAC_ENCRYPTED        = 0xCF,
160        STREAMTYPE_AC3_ENCRYPTED        = 0xC1,
161    };
162
163protected:
164    virtual ~ATSParser();
165
166private:
167    struct Program;
168    struct Stream;
169    struct PSISection;
170    struct CasManager;
171    struct CADescriptor {
172        int32_t mSystemID;
173        unsigned mPID;
174        std::vector<uint8_t> mPrivateData;
175    };
176
177    sp<CasManager> mCasManager;
178
179    uint32_t mFlags;
180    Vector<sp<Program> > mPrograms;
181
182    // Keyed by PID
183    KeyedVector<unsigned, sp<PSISection> > mPSISections;
184
185    int64_t mAbsoluteTimeAnchorUs;
186
187    bool mTimeOffsetValid;
188    int64_t mTimeOffsetUs;
189    int64_t mLastRecoveredPTS;
190
191    size_t mNumTSPacketsParsed;
192
193    sp<AMessage> mSampleAesKeyItem;
194
195    void parseProgramAssociationTable(ABitReader *br);
196    void parseProgramMap(ABitReader *br);
197    // Parse PES packet where br is pointing to. If the PES contains a sync
198    // frame, set event with the time and the start offset of this PES.
199    // Note that the method itself does not touch event.
200    void parsePES(ABitReader *br, SyncEvent *event);
201
202    // Strip remaining packet headers and pass to appropriate program/stream
203    // to parse the payload. If the payload turns out to be PES and contains
204    // a sync frame, event shall be set with the time and start offset of the
205    // PES.
206    // Note that the method itself does not touch event.
207    status_t parsePID(
208        ABitReader *br, unsigned PID,
209        unsigned continuity_counter,
210        unsigned payload_unit_start_indicator,
211        unsigned transport_scrambling_control,
212        unsigned random_access_indicator,
213        SyncEvent *event);
214
215    status_t parseAdaptationField(
216            ABitReader *br, unsigned PID, unsigned *random_access_indicator);
217
218    // see feedTSPacket().
219    status_t parseTS(ABitReader *br, SyncEvent *event);
220
221    void updatePCR(unsigned PID, uint64_t PCR, uint64_t byteOffsetFromStart);
222
223    uint64_t mPCR[2];
224    uint64_t mPCRBytes[2];
225    int64_t mSystemTimeUs[2];
226    size_t mNumPCRs;
227
228    DISALLOW_EVIL_CONSTRUCTORS(ATSParser);
229};
230
231}  // namespace android
232
233#endif  // A_TS_PARSER_H_
234