aboutsummaryrefslogtreecommitdiff
path: root/engines/sludge/libwebm/mkvparser.hpp
blob: 1ebfbaf361f1d6753e502ffeda9acab7e1873ee4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
// Copyright (c) 2010 The WebM project authors. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS.  All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.

#ifndef MKVPARSER_HPP
#define MKVPARSER_HPP

#include <cstdlib>
#include <cstdio>
#include <cstddef>

namespace mkvparser
{

const int E_FILE_FORMAT_INVALID = -2;
const int E_BUFFER_NOT_FULL = -3;

class IMkvReader
{
public:
    virtual int Read(long long pos, long len, unsigned char* buf) = 0;
    virtual int Length(long long* total, long long* available) = 0;
protected:
    virtual ~IMkvReader();
};

long long GetUIntLength(IMkvReader*, long long, long&);
long long ReadUInt(IMkvReader*, long long, long&);
long long SyncReadUInt(IMkvReader*, long long pos, long long stop, long&);
long long UnserializeUInt(IMkvReader*, long long pos, long long size);
float Unserialize4Float(IMkvReader*, long long);
double Unserialize8Double(IMkvReader*, long long);
short Unserialize2SInt(IMkvReader*, long long);
signed char Unserialize1SInt(IMkvReader*, long long);
bool Match(IMkvReader*, long long&, unsigned long, long long&);
bool Match(IMkvReader*, long long&, unsigned long, char*&);
bool Match(IMkvReader*, long long&, unsigned long, unsigned char*&, size_t&);
bool Match(IMkvReader*, long long&, unsigned long, double&);
bool Match(IMkvReader*, long long&, unsigned long, short&);

void GetVersion(int& major, int& minor, int& build, int& revision);

struct EBMLHeader
{
    EBMLHeader();
    ~EBMLHeader();
    long long m_version;
    long long m_readVersion;
    long long m_maxIdLength;
    long long m_maxSizeLength;
    char* m_docType;
    long long m_docTypeVersion;
    long long m_docTypeReadVersion;

    long long Parse(IMkvReader*, long long&);
    void Init();
};


class Segment;
class Track;
class Cluster;

class Block
{
    Block(const Block&);
    Block& operator=(const Block&);

public:
    const long long m_start;
    const long long m_size;

    Block(long long start, long long size, IMkvReader*);
    ~Block();

    long long GetTrackNumber() const;
    long long GetTimeCode(const Cluster*) const;  //absolute, but not scaled
    long long GetTime(const Cluster*) const;      //absolute, and scaled (ns)
    bool IsKey() const;
    void SetKey(bool);
    bool IsInvisible() const;

    int GetFrameCount() const;  //to index frames: [0, count)

    struct Frame
    {
        long long pos;  //absolute offset
        long len;

        long Read(IMkvReader*, unsigned char*) const;
    };

    const Frame& GetFrame(int frame_index) const;

private:
    long long m_track;   //Track::Number()
    short m_timecode;  //relative to cluster
    unsigned char m_flags;

    Frame* m_frames;
    int m_frame_count;

};


class BlockEntry
{
    BlockEntry(const BlockEntry&);
    BlockEntry& operator=(const BlockEntry&);

public:
    virtual ~BlockEntry();
    virtual bool EOS() const = 0;
    virtual const Cluster* GetCluster() const = 0;
    virtual size_t GetIndex() const = 0;
    virtual const Block* GetBlock() const = 0;
    //virtual bool IsBFrame() const = 0;

protected:
    BlockEntry();

};


class SimpleBlock : public BlockEntry
{
    SimpleBlock(const SimpleBlock&);
    SimpleBlock& operator=(const SimpleBlock&);

public:
    SimpleBlock(Cluster*, size_t, long long start, long long size);

    bool EOS() const;
    const Cluster* GetCluster() const;
    size_t GetIndex() const;
    const Block* GetBlock() const;
    //bool IsBFrame() const;

protected:
    Cluster* const m_pCluster;
    const size_t m_index;
    Block m_block;

};


class BlockGroup : public BlockEntry
{
    BlockGroup(const BlockGroup&);
    BlockGroup& operator=(const BlockGroup&);

public:
    BlockGroup(Cluster*, size_t, long long, long long);
    ~BlockGroup();

    bool EOS() const;
    const Cluster* GetCluster() const;
    size_t GetIndex() const;
    const Block* GetBlock() const;
    //bool IsBFrame() const;

    short GetPrevTimeCode() const;  //relative to block's time
    short GetNextTimeCode() const;  //as above

protected:
    Cluster* const m_pCluster;
    const size_t m_index;

private:
    BlockGroup(Cluster*, size_t, unsigned long);
    void ParseBlock(long long start, long long size);

    short m_prevTimeCode;
    short m_nextTimeCode;

    //TODO: the Matroska spec says you can have multiple blocks within the
    //same block group, with blocks ranked by priority (the flag bits).
    //For now we just cache a single block.
#if 0
    typedef std::deque<Block*> blocks_t;
    blocks_t m_blocks;  //In practice should contain only a single element.
#else
    Block* m_pBlock;
#endif

};


class Track
{
    Track(const Track&);
    Track& operator=(const Track&);

public:
    Segment* const m_pSegment;
    const long long m_element_start;
    const long long m_element_size;
    virtual ~Track();

    long long GetType() const;
    long long GetNumber() const;
    unsigned long long GetUid() const;
    const char* GetNameAsUTF8() const;
    const char* GetCodecNameAsUTF8() const;
    const char* GetCodecId() const;
    const unsigned char* GetCodecPrivate(size_t&) const;
    bool GetLacing() const;

    const BlockEntry* GetEOS() const;

    struct Settings
    {
        long long start;
        long long size;
    };

    struct Info
    {
        long long type;
        long long number;
        unsigned long long uid;
        char* nameAsUTF8;
        char* codecId;
        unsigned char* codecPrivate;
        size_t codecPrivateSize;
        char* codecNameAsUTF8;
        bool lacing;
        Settings settings;

        Info();
        void Clear();
    };

    long GetFirst(const BlockEntry*&) const;
    long GetNext(const BlockEntry* pCurr, const BlockEntry*& pNext) const;
    virtual bool VetEntry(const BlockEntry*) const = 0;
    virtual long Seek(long long time_ns, const BlockEntry*&) const = 0;

protected:
    Track(
        Segment*,
        const Info&,
        long long element_start,
        long long element_size);
    const Info m_info;

    class EOSBlock : public BlockEntry
    {
    public:
        EOSBlock();

        bool EOS() const;
        const Cluster* GetCluster() const;
        size_t GetIndex() const;
        const Block* GetBlock() const;
        bool IsBFrame() const;
    };

    EOSBlock m_eos;

};


class VideoTrack : public Track
{
    VideoTrack(const VideoTrack&);
    VideoTrack& operator=(const VideoTrack&);

public:
    VideoTrack(
        Segment*,
        const Info&,
        long long element_start,
        long long element_size);
    long long GetWidth() const;
    long long GetHeight() const;
    double GetFrameRate() const;

    bool VetEntry(const BlockEntry*) const;
    long Seek(long long time_ns, const BlockEntry*&) const;

private:
    long long m_width;
    long long m_height;
    double m_rate;

};


class AudioTrack : public Track
{
    AudioTrack(const AudioTrack&);
    AudioTrack& operator=(const AudioTrack&);

public:
    AudioTrack(
        Segment*,
        const Info&,
        long long element_start,
        long long element_size);
    double GetSamplingRate() const;
    long long GetChannels() const;
    long long GetBitDepth() const;
    bool VetEntry(const BlockEntry*) const;
    long Seek(long long time_ns, const BlockEntry*&) const;

private:
    double m_rate;
    long long m_channels;
    long long m_bitDepth;
};


class Tracks
{
    Tracks(const Tracks&);
    Tracks& operator=(const Tracks&);

public:
    Segment* const m_pSegment;
    const long long m_start;
    const long long m_size;
    const long long m_element_start;
    const long long m_element_size;

    Tracks(
        Segment*,
        long long start,
        long long size,
        long long element_start,
        long long element_size);
    virtual ~Tracks();

    const Track* GetTrackByNumber(unsigned long tn) const;
    const Track* GetTrackByIndex(unsigned long idx) const;

private:
    Track** m_trackEntries;
    Track** m_trackEntriesEnd;

    void ParseTrackEntry(
        long long,
        long long,
        Track*&,
        long long element_start,
        long long element_size);

public:
    unsigned long GetTracksCount() const;
};


class SegmentInfo
{
    SegmentInfo(const SegmentInfo&);
    SegmentInfo& operator=(const SegmentInfo&);

public:
    Segment* const m_pSegment;
    const long long m_start;
    const long long m_size;
    const long long m_element_start;
    const long long m_element_size;

    SegmentInfo(
        Segment*,
        long long start,
        long long size,
        long long element_start,
        long long element_size);

    ~SegmentInfo();

    long long GetTimeCodeScale() const;
    long long GetDuration() const;  //scaled
    const char* GetMuxingAppAsUTF8() const;
    const char* GetWritingAppAsUTF8() const;
    const char* GetTitleAsUTF8() const;

private:
    long long m_timecodeScale;
    double m_duration;
    char* m_pMuxingAppAsUTF8;
    char* m_pWritingAppAsUTF8;
    char* m_pTitleAsUTF8;
};


class SeekHead
{
    SeekHead(const SeekHead&);
    SeekHead& operator=(const SeekHead&);

public:
    Segment* const m_pSegment;
    const long long m_start;
    const long long m_size;
    const long long m_element_start;
    const long long m_element_size;

    SeekHead(
        Segment*,
        long long start,
        long long size,
        long long element_start,
        long long element_size);

    ~SeekHead();

    struct Entry
    {
        long long id;
        long long pos;
    };

    int GetCount() const;
    const Entry* GetEntry(int idx) const;

private:
    Entry* m_entries;
    int m_count;

    static void ParseEntry(
        IMkvReader*,
        long long pos,
        long long size,
        Entry*&);

};

class Cues;
class CuePoint
{
    friend class Cues;

    CuePoint(size_t, long long);
    ~CuePoint();

    CuePoint(const CuePoint&);
    CuePoint& operator=(const CuePoint&);

public:
    long long m_element_start;
    long long m_element_size;

    void Load(IMkvReader*);

    long long GetTimeCode() const;      //absolute but unscaled
    long long GetTime(const Segment*) const;  //absolute and scaled (ns units)

    struct TrackPosition
    {
        long long m_track;
        long long m_pos;  //of cluster
        long long m_block;
        //codec_state  //defaults to 0
        //reference = clusters containing req'd referenced blocks
        //  reftime = timecode of the referenced block

        void Parse(IMkvReader*, long long, long long);
    };

    const TrackPosition* Find(const Track*) const;

private:
    const size_t m_index;
    long long m_timecode;
    TrackPosition* m_track_positions;
    size_t m_track_positions_count;

};


class Cues
{
    friend class Segment;

    Cues(
        Segment*,
        long long start,
        long long size,
        long long element_start,
        long long element_size);
    ~Cues();

    Cues(const Cues&);
    Cues& operator=(const Cues&);

public:
    Segment* const m_pSegment;
    const long long m_start;
    const long long m_size;
    const long long m_element_start;
    const long long m_element_size;

    bool Find(  //lower bound of time_ns
        long long time_ns,
        const Track*,
        const CuePoint*&,
        const CuePoint::TrackPosition*&) const;

#if 0
    bool FindNext(  //upper_bound of time_ns
        long long time_ns,
        const Track*,
        const CuePoint*&,
        const CuePoint::TrackPosition*&) const;
#endif

    const CuePoint* GetFirst() const;
    const CuePoint* GetLast() const;
    const CuePoint* GetNext(const CuePoint*) const;

    const BlockEntry* GetBlock(
                        const CuePoint*,
                        const CuePoint::TrackPosition*) const;

    bool LoadCuePoint() const;
    long GetCount() const;  //loaded only
    //long GetTotal() const;  //loaded + preloaded
    bool DoneParsing() const;

private:
    void Init() const;
    void PreloadCuePoint(size_t&, long long) const;

    mutable CuePoint** m_cue_points;
    mutable size_t m_count;
    mutable size_t m_preload_count;
    mutable long long m_pos;

};


class Cluster
{
    friend class Segment;

    Cluster(const Cluster&);
    Cluster& operator=(const Cluster&);

public:
    Segment* const m_pSegment;

public:
    static Cluster* Create(
        Segment*,
        long index,     //index in segment
        long long off,  //offset relative to segment
        long long element_size);

    Cluster();  //EndOfStream
    ~Cluster();

    bool EOS() const;

    long long GetTimeCode() const;   //absolute, but not scaled
    long long GetTime() const;       //absolute, and scaled (nanosecond units)
    long long GetFirstTime() const;  //time (ns) of first (earliest) block
    long long GetLastTime() const;   //time (ns) of last (latest) block

    const BlockEntry* GetFirst() const;
    const BlockEntry* GetLast() const;
    const BlockEntry* GetNext(const BlockEntry*) const;
    const BlockEntry* GetEntry(const Track*, long long ns = -1) const;
    const BlockEntry* GetEntry(
        const CuePoint&,
        const CuePoint::TrackPosition&) const;
    const BlockEntry* GetMaxKey(const VideoTrack*) const;

//    static bool HasBlockEntries(const Segment*, long long);

    static long HasBlockEntries(
            const Segment*,
            long long idoff,
            long long& pos,
            long& size);

    long GetEntryCount() const;

    void Load() const;
    long Load(long long& pos, long& size) const;

    void LoadBlockEntries() const;

    long Parse(long long& pos, long& size) const;
    long GetEntry(long index, const mkvparser::BlockEntry*&) const;

protected:
    Cluster(
        Segment*,
        long index,
        //long long off,
        long long element_start,
        long long element_size);

public:
    const long long m_element_start;
    long long GetPosition() const;  //offset relative to segment

    long GetIndex() const;
    long long GetElementSize() const;
    //long long GetPayloadSize() const;

    long long Unparsed() const;

private:
    long m_index;
    mutable long long m_pos;
    mutable long long m_size;
    mutable long long m_element_size;
    mutable long long m_timecode;
    mutable BlockEntry** m_entries;
    mutable long m_entries_size;
    mutable long m_entries_count;

    void ParseBlock(long long id, long long pos, long long size) const;
    void ParseBlockGroup(long long, long long, BlockEntry**&) const;
    void ParseSimpleBlock(long long, long long, BlockEntry**&) const;

};


class Segment
{
    friend class Cues;
    friend class VideoTrack;
    friend class AudioTrack;

    Segment(const Segment&);
    Segment& operator=(const Segment&);

private:
    Segment(IMkvReader*, long long pos, long long size);

public:
    IMkvReader* const m_pReader;
    const long long m_start;  //posn of segment payload
    const long long m_size;   //size of segment payload
    Cluster m_eos;  //TODO: make private?

    static long long CreateInstance(IMkvReader*, long long, Segment*&);
    ~Segment();

    long Load();  //loads headers and all clusters

    //for incremental loading
    long long Unparsed() const;
    long long ParseHeaders();  //stops when first cluster is found
    //long FindNextCluster(long long& pos, long& size) const;
    long LoadCluster(long long& pos, long& size);  //load one cluster
    long LoadCluster();

    long ParseNext(
            const Cluster* pCurr,
            const Cluster*& pNext,
            long long& pos,
            long& size);

#if 0
    //This pair parses one cluster, but only changes the state of the
    //segment object when the cluster is actually added to the index.
    long ParseCluster(long long& cluster_pos, long long& new_pos) const;
    bool AddCluster(long long cluster_pos, long long new_pos);
#endif

    const SeekHead* GetSeekHead() const;
    const Tracks* GetTracks() const;
    const SegmentInfo* GetInfo() const;
    const Cues* GetCues() const;

    long long GetDuration() const;

    unsigned long GetCount() const;
    const Cluster* GetFirst() const;
    const Cluster* GetLast() const;
    const Cluster* GetNext(const Cluster*);

    const Cluster* FindCluster(long long time_nanoseconds) const;
    //const BlockEntry* Seek(long long time_nanoseconds, const Track*) const;

    const Cluster* FindOrPreloadCluster(long long pos);

    long ParseCues(
        long long cues_off,  //offset relative to start of segment
        long long& parse_pos,
        long& parse_len);

private:

    long long m_pos;  //absolute file posn; what has been consumed so far

    SeekHead* m_pSeekHead;
    SegmentInfo* m_pInfo;
    Tracks* m_pTracks;
    Cues* m_pCues;
    Cluster** m_clusters;
    long m_clusterCount;         //number of entries for which m_index >= 0
    long m_clusterPreloadCount;  //number of entries for which m_index < 0
    long m_clusterSize;          //array size

    void AppendCluster(Cluster*);
    void PreloadCluster(Cluster*, ptrdiff_t);

    //void ParseSeekHead(long long pos, long long size);
    //void ParseSeekEntry(long long pos, long long size);
    //void ParseCues(long long);

    const BlockEntry* GetBlock(
        const CuePoint&,
        const CuePoint::TrackPosition&);

};

}  //end namespace mkvparser

inline long mkvparser::Segment::LoadCluster()
{
    long long pos;
    long size;

    return LoadCluster(pos, size);
}

#endif  //MKVPARSER_HPP