summaryrefslogtreecommitdiffstats
path: root/libavcodec/h264dec.h
blob: f934fc40b84a78cdf4eb402d581021adfa7d3dd8 (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
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
/*
 * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
 *
 * This file is part of Libav.
 *
 * Libav is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * Libav is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * H.264 / AVC / MPEG-4 part10 codec.
 * @author Michael Niedermayer <michaelni@gmx.at>
 */

#ifndef AVCODEC_H264DEC_H
#define AVCODEC_H264DEC_H

#include "libavutil/buffer.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/thread.h"

#include "cabac.h"
#include "error_resilience.h"
#include "h264_parse.h"
#include "h264_ps.h"
#include "h264_sei.h"
#include "h2645_parse.h"
#include "h264chroma.h"
#include "h264dsp.h"
#include "h264pred.h"
#include "h264qpel.h"
#include "internal.h"
#include "mpegutils.h"
#include "parser.h"
#include "qpeldsp.h"
#include "rectangle.h"
#include "videodsp.h"

#define H264_MAX_PICTURE_COUNT 32

#define MAX_MMCO_COUNT         66

#define MAX_DELAYED_PIC_COUNT  16

/* Compiling in interlaced support reduces the speed
 * of progressive decoding by about 2%. */
#define ALLOW_INTERLACE

#define FMO 0

/**
 * The maximum number of slices supported by the decoder.
 * must be a power of 2
 */
#define MAX_SLICES 32

#ifdef ALLOW_INTERLACE
#define MB_MBAFF(h)    h->mb_mbaff
#define MB_FIELD(h)    h->mb_field_decoding_flag
#define FRAME_MBAFF(h) h->mb_aff_frame
#define FIELD_PICTURE(h) (h->picture_structure != PICT_FRAME)
#define LEFT_MBS 2
#define LTOP     0
#define LBOT     1
#define LEFT(i)  (i)
#else
#define MB_MBAFF(h)      0
#define MB_FIELD(h)      0
#define FRAME_MBAFF(h)   0
#define FIELD_PICTURE(h) 0
#undef  IS_INTERLACED
#define IS_INTERLACED(mb_type) 0
#define LEFT_MBS 1
#define LTOP     0
#define LBOT     0
#define LEFT(i)  0
#endif
#define FIELD_OR_MBAFF_PICTURE(h) (FRAME_MBAFF(h) || FIELD_PICTURE(h))

#ifndef CABAC
#define CABAC(h) h->ps.pps->cabac
#endif

#define CHROMA422(h) (h->ps.sps->chroma_format_idc == 2)
#define CHROMA444(h) (h->ps.sps->chroma_format_idc == 3)

#define MB_TYPE_REF0       MB_TYPE_ACPRED // dirty but it fits in 16 bit
#define MB_TYPE_8x8DCT     0x01000000
#define IS_REF0(a)         ((a) & MB_TYPE_REF0)
#define IS_8x8DCT(a)       ((a) & MB_TYPE_8x8DCT)

/**
 * Memory management control operation opcode.
 */
typedef enum MMCOOpcode {
    MMCO_END = 0,
    MMCO_SHORT2UNUSED,
    MMCO_LONG2UNUSED,
    MMCO_SHORT2LONG,
    MMCO_SET_MAX_LONG,
    MMCO_RESET,
    MMCO_LONG,
} MMCOOpcode;

/**
 * Memory management control operation.
 */
typedef struct MMCO {
    MMCOOpcode opcode;
    int short_pic_num;  ///< pic_num without wrapping (pic_num & max_pic_num)
    int long_arg;       ///< index, pic_num, or num long refs depending on opcode
} MMCO;

typedef struct H264Picture {
    AVFrame *f;
    ThreadFrame tf;

    AVBufferRef *qscale_table_buf;
    int8_t *qscale_table;

    AVBufferRef *motion_val_buf[2];
    int16_t (*motion_val[2])[2];

    AVBufferRef *mb_type_buf;
    uint32_t *mb_type;

    AVBufferRef *hwaccel_priv_buf;
    void *hwaccel_picture_private; ///< hardware accelerator private data

    AVBufferRef *ref_index_buf[2];
    int8_t *ref_index[2];

    int field_poc[2];       ///< top/bottom POC
    int poc;                ///< frame POC
    int frame_num;          ///< frame_num (raw frame_num from slice header)
    int mmco_reset;         /**< MMCO_RESET set this 1. Reordering code must
                                 not mix pictures before and after MMCO_RESET. */
    int pic_id;             /**< pic_num (short -> no wrap version of pic_num,
                                 pic_num & max_pic_num; long -> long_pic_num) */
    int long_ref;           ///< 1->long term reference 0->short term reference
    int ref_poc[2][2][32];  ///< POCs of the frames used as reference (FIXME need per slice)
    int ref_count[2][2];    ///< number of entries in ref_poc         (FIXME need per slice)
    int mbaff;              ///< 1 -> MBAFF frame 0-> not MBAFF
    int field_picture;      ///< whether or not picture was encoded in separate fields

    int reference;
    int recovered;          ///< picture at IDR or recovery point + recovery count
} H264Picture;

typedef struct H264Ref {
    uint8_t *data[3];
    int linesize[3];

    int reference;
    int poc;
    int pic_id;

    H264Picture *parent;
} H264Ref;

typedef struct H264SliceContext {
    struct H264Context *h264;
    GetBitContext gb;
    ERContext er;

    int slice_num;
    int slice_type;
    int slice_type_nos;         ///< S free slice type (SI/SP are remapped to I/P)
    int slice_type_fixed;

    int qscale;
    int chroma_qp[2];   // QPc
    int qp_thresh;      ///< QP threshold to skip loopfilter
    int last_qscale_diff;

    // deblock
    int deblocking_filter;          ///< disable_deblocking_filter_idc with 1 <-> 0
    int slice_alpha_c0_offset;
    int slice_beta_offset;

    H264PredWeightTable pwt;

    int prev_mb_skipped;
    int next_mb_skipped;

    int chroma_pred_mode;
    int intra16x16_pred_mode;

    int8_t intra4x4_pred_mode_cache[5 * 8];
    int8_t(*intra4x4_pred_mode);

    int topleft_mb_xy;
    int top_mb_xy;
    int topright_mb_xy;
    int left_mb_xy[LEFT_MBS];

    int topleft_type;
    int top_type;
    int topright_type;
    int left_type[LEFT_MBS];

    const uint8_t *left_block;
    int topleft_partition;

    unsigned int topleft_samples_available;
    unsigned int top_samples_available;
    unsigned int topright_samples_available;
    unsigned int left_samples_available;

    ptrdiff_t linesize, uvlinesize;
    ptrdiff_t mb_linesize;  ///< may be equal to s->linesize or s->linesize * 2, for mbaff
    ptrdiff_t mb_uvlinesize;

    int mb_x, mb_y;
    int mb_xy;
    int resync_mb_x;
    int resync_mb_y;
    unsigned int first_mb_addr;
    // index of the first MB of the next slice
    int next_slice_idx;
    int mb_skip_run;
    int is_complex;

    int picture_structure;
    int mb_field_decoding_flag;
    int mb_mbaff;               ///< mb_aff_frame && mb_field_decoding_flag

    int redundant_pic_count;

    /**
     * number of neighbors (top and/or left) that used 8x8 dct
     */
    int neighbor_transform_size;

    int direct_spatial_mv_pred;
    int col_parity;
    int col_fieldoff;

    int cbp;
    int top_cbp;
    int left_cbp;

    int dist_scale_factor[32];
    int dist_scale_factor_field[2][32];
    int map_col_to_list0[2][16 + 32];
    int map_col_to_list0_field[2][2][16 + 32];

    /**
     * num_ref_idx_l0/1_active_minus1 + 1
     */
    unsigned int ref_count[2];          ///< counts frames or fields, depending on current mb mode
    unsigned int list_count;
    H264Ref ref_list[2][48];        /**< 0..15: frame refs, 16..47: mbaff field refs.
                                         *   Reordered version of default_ref_list
                                         *   according to picture reordering in slice header */
    struct {
        uint8_t op;
        uint8_t val;
    } ref_modifications[2][32];
    int nb_ref_modifications[2];

    unsigned int pps_id;

    const uint8_t *intra_pcm_ptr;
    int16_t *dc_val_base;

    uint8_t *bipred_scratchpad;
    uint8_t *edge_emu_buffer;
    uint8_t (*top_borders[2])[(16 * 3) * 2];
    int bipred_scratchpad_allocated;
    int edge_emu_buffer_allocated;
    int top_borders_allocated[2];

    /**
     * non zero coeff count cache.
     * is 64 if not available.
     */
    DECLARE_ALIGNED(8, uint8_t, non_zero_count_cache)[15 * 8];

    /**
     * Motion vector cache.
     */
    DECLARE_ALIGNED(16, int16_t, mv_cache)[2][5 * 8][2];
    DECLARE_ALIGNED(8,  int8_t, ref_cache)[2][5 * 8];
    DECLARE_ALIGNED(16, uint8_t, mvd_cache)[2][5 * 8][2];
    uint8_t direct_cache[5 * 8];

    DECLARE_ALIGNED(8, uint16_t, sub_mb_type)[4];

    ///< as a DCT coefficient is int32_t in high depth, we need to reserve twice the space.
    DECLARE_ALIGNED(16, int16_t, mb)[16 * 48 * 2];
    DECLARE_ALIGNED(16, int16_t, mb_luma_dc)[3][16 * 2];
    ///< as mb is addressed by scantable[i] and scantable is uint8_t we can either
    ///< check that i is not too large or ensure that there is some unused stuff after mb
    int16_t mb_padding[256 * 2];

    uint8_t (*mvd_table[2])[2];

    /**
     * Cabac
     */
    CABACContext cabac;
    uint8_t cabac_state[1024];
    int cabac_init_idc;

    MMCO mmco[MAX_MMCO_COUNT];
    int  nb_mmco;
    int explicit_ref_marking;

    int frame_num;
    int poc_lsb;
    int delta_poc_bottom;
    int delta_poc[2];
    int curr_pic_num;
    int max_pic_num;
} H264SliceContext;

/**
 * H264Context
 */
typedef struct H264Context {
    const AVClass *class;
    AVCodecContext *avctx;
    VideoDSPContext vdsp;
    H264DSPContext h264dsp;
    H264ChromaContext h264chroma;
    H264QpelContext h264qpel;

    H264Picture DPB[H264_MAX_PICTURE_COUNT];
    H264Picture *cur_pic_ptr;
    H264Picture cur_pic;

    H264SliceContext *slice_ctx;
    int            nb_slice_ctx;
    int            nb_slice_ctx_queued;

    H2645Packet pkt;

    int pixel_shift;    ///< 0 for 8-bit H.264, 1 for high-bit-depth H.264

    /* coded dimensions -- 16 * mb w/h */
    int width, height;
    int chroma_x_shift, chroma_y_shift;

    int droppable;
    int coded_picture_number;

    int context_initialized;
    int flags;
    int workaround_bugs;
    /* Set when slice threading is used and at least one slice uses deblocking
     * mode 1 (i.e. across slice boundaries). Then we disable the loop filter
     * during normal MB decoding and execute it serially at the end.
     */
    int postpone_filter;

    /*
     * Set to 1 when the current picture is IDR, 0 otherwise.
     */
    int picture_idr;

    int8_t(*intra4x4_pred_mode);
    H264PredContext hpc;

    uint8_t (*non_zero_count)[48];

#define LIST_NOT_USED -1 // FIXME rename?
#define PART_NOT_AVAILABLE -2

    /**
     * block_offset[ 0..23] for frame macroblocks
     * block_offset[24..47] for field macroblocks
     */
    int block_offset[2 * (16 * 3)];

    uint32_t *mb2b_xy;  // FIXME are these 4 a good idea?
    uint32_t *mb2br_xy;
    int b_stride;       // FIXME use s->b4_stride

    uint16_t *slice_table;      ///< slice_table_base + 2*mb_stride + 1

    // interlacing specific flags
    int mb_aff_frame;
    int picture_structure;
    int first_field;

    uint8_t *list_counts;               ///< Array of list_count per MB specifying the slice type

    /* 0x100 -> non null luma_dc, 0x80/0x40 -> non null chroma_dc (cb/cr), 0x?0 -> chroma_cbp(0, 1, 2), 0x0? luma_cbp */
    uint16_t *cbp_table;

    /* chroma_pred_mode for i4x4 or i16x16, else 0 */
    uint8_t *chroma_pred_mode_table;
    uint8_t (*mvd_table[2])[2];
    uint8_t *direct_table;

    uint8_t zigzag_scan[16];
    uint8_t zigzag_scan8x8[64];
    uint8_t zigzag_scan8x8_cavlc[64];
    uint8_t field_scan[16];
    uint8_t field_scan8x8[64];
    uint8_t field_scan8x8_cavlc[64];
    const uint8_t *zigzag_scan_q0;
    const uint8_t *zigzag_scan8x8_q0;
    const uint8_t *zigzag_scan8x8_cavlc_q0;
    const uint8_t *field_scan_q0;
    const uint8_t *field_scan8x8_q0;
    const uint8_t *field_scan8x8_cavlc_q0;

    int mb_y;
    int mb_height, mb_width;
    int mb_stride;
    int mb_num;

    // =============================================================
    // Things below are not used in the MB or more inner code

    int nal_ref_idc;
    int nal_unit_type;

    /**
     * Used to parse AVC variant of H.264
     */
    int is_avc;           ///< this flag is != 0 if codec is avc1
    int nal_length_size;  ///< Number of bytes used for nal length (1, 2 or 4)

    int bit_depth_luma;         ///< luma bit depth from sps to detect changes
    int chroma_format_idc;      ///< chroma format from sps to detect changes

    H264ParamSets ps;

    uint16_t *slice_table_base;

    H264POCContext poc;

    H264Picture *short_ref[32];
    H264Picture *long_ref[32];
    H264Picture *delayed_pic[MAX_DELAYED_PIC_COUNT + 2]; // FIXME size?
    int last_pocs[MAX_DELAYED_PIC_COUNT];
    int next_outputed_poc;

    /**
     * memory management control operations buffer.
     */
    MMCO mmco[MAX_MMCO_COUNT];
    int  nb_mmco;
    int mmco_reset;
    int explicit_ref_marking;

    int long_ref_count;     ///< number of actual long term references
    int short_ref_count;    ///< number of actual short term references

    /**
     * @name Members for slice based multithreading
     * @{
     */
    /**
     * current slice number, used to initialize slice_num of each thread/context
     */
    int current_slice;

    /** @} */

    /**
     * Complement sei_pic_struct
     * SEI_PIC_STRUCT_TOP_BOTTOM and SEI_PIC_STRUCT_BOTTOM_TOP indicate interlaced frames.
     * However, soft telecined frames may have these values.
     * This is used in an attempt to flag soft telecine progressive.
     */
    int prev_interlaced_frame;

    /**
     * recovery_frame is the frame_num at which the next frame should
     * be fully constructed.
     *
     * Set to -1 when not expecting a recovery point.
     */
    int recovery_frame;

/**
 * We have seen an IDR, so all the following frames in coded order are correctly
 * decodable.
 */
#define FRAME_RECOVERED_IDR  (1 << 0)
/**
 * Sufficient number of frames have been decoded since a SEI recovery point,
 * so all the following frames in presentation order are correct.
 */
#define FRAME_RECOVERED_SEI  (1 << 1)

    int frame_recovered;    ///< Initial frame has been completely recovered

    /* for frame threading, this is set to 1
     * after finish_setup() has been called, so we cannot modify
     * some context properties (which are supposed to stay constant between
     * slices) anymore */
    int setup_finished;

    AVFrame *output_frame;

    int enable_er;

    H264SEIContext sei;

    AVBufferPool *qscale_table_pool;
    AVBufferPool *mb_type_pool;
    AVBufferPool *motion_val_pool;
    AVBufferPool *ref_index_pool;
    int ref2frm[MAX_SLICES][2][64];     ///< reference to frame number lists, used in the loop filter, the first 2 are for -2,-1
} H264Context;

extern const uint16_t ff_h264_mb_sizes[4];

/**
 * Reconstruct bitstream slice_type.
 */
int ff_h264_get_slice_type(const H264SliceContext *sl);

/**
 * Allocate tables.
 * needs width/height
 */
int ff_h264_alloc_tables(H264Context *h);

int ff_h264_decode_ref_pic_list_reordering(H264SliceContext *sl, void *logctx);
int ff_h264_build_ref_list(const H264Context *h, H264SliceContext *sl);
void ff_h264_remove_all_refs(H264Context *h);

/**
 * Execute the reference picture marking (memory management control operations).
 */
int ff_h264_execute_ref_pic_marking(H264Context *h);

int ff_h264_decode_ref_pic_marking(H264SliceContext *sl, GetBitContext *gb,
                                   const H2645NAL *nal, void *logctx);

void ff_h264_hl_decode_mb(const H264Context *h, H264SliceContext *sl);
int ff_h264_decode_init(AVCodecContext *avctx);
void ff_h264_decode_init_vlc(void);

/**
 * Decode a macroblock
 * @return 0 if OK, ER_AC_ERROR / ER_DC_ERROR / ER_MV_ERROR on error
 */
int ff_h264_decode_mb_cavlc(const H264Context *h, H264SliceContext *sl);

/**
 * Decode a CABAC coded macroblock
 * @return 0 if OK, ER_AC_ERROR / ER_DC_ERROR / ER_MV_ERROR on error
 */
int ff_h264_decode_mb_cabac(const H264Context *h, H264SliceContext *sl);

void ff_h264_init_cabac_states(const H264Context *h, H264SliceContext *sl);

void ff_h264_init_dequant_tables(H264Context *h);

void ff_h264_direct_dist_scale_factor(const H264Context *const h, H264SliceContext *sl);
void ff_h264_direct_ref_list_init(const H264Context *const h, H264SliceContext *sl);
void ff_h264_pred_direct_motion(const H264Context *const h, H264SliceContext *sl,
                                int *mb_type);

void ff_h264_filter_mb_fast(const H264Context *h, H264SliceContext *sl, int mb_x, int mb_y,
                            uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr,
                            unsigned int linesize, unsigned int uvlinesize);
void ff_h264_filter_mb(const H264Context *h, H264SliceContext *sl, int mb_x, int mb_y,
                       uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr,
                       unsigned int linesize, unsigned int uvlinesize);

/*
 * o-o o-o
 *  / / /
 * o-o o-o
 *  ,---'
 * o-o o-o
 *  / / /
 * o-o o-o
 */

/* Scan8 organization:
 *    0 1 2 3 4 5 6 7
 * 0  DY    y y y y y
 * 1        y Y Y Y Y
 * 2        y Y Y Y Y
 * 3        y Y Y Y Y
 * 4        y Y Y Y Y
 * 5  DU    u u u u u
 * 6        u U U U U
 * 7        u U U U U
 * 8        u U U U U
 * 9        u U U U U
 * 10 DV    v v v v v
 * 11       v V V V V
 * 12       v V V V V
 * 13       v V V V V
 * 14       v V V V V
 * DY/DU/DV are for luma/chroma DC.
 */

#define LUMA_DC_BLOCK_INDEX   48
#define CHROMA_DC_BLOCK_INDEX 49

// This table must be here because scan8[constant] must be known at compiletime
static const uint8_t scan8[16 * 3 + 3] = {
    4 +  1 * 8, 5 +  1 * 8, 4 +  2 * 8, 5 +  2 * 8,
    6 +  1 * 8, 7 +  1 * 8, 6 +  2 * 8, 7 +  2 * 8,
    4 +  3 * 8, 5 +  3 * 8, 4 +  4 * 8, 5 +  4 * 8,
    6 +  3 * 8, 7 +  3 * 8, 6 +  4 * 8, 7 +  4 * 8,
    4 +  6 * 8, 5 +  6 * 8, 4 +  7 * 8, 5 +  7 * 8,
    6 +  6 * 8, 7 +  6 * 8, 6 +  7 * 8, 7 +  7 * 8,
    4 +  8 * 8, 5 +  8 * 8, 4 +  9 * 8, 5 +  9 * 8,
    6 +  8 * 8, 7 +  8 * 8, 6 +  9 * 8, 7 +  9 * 8,
    4 + 11 * 8, 5 + 11 * 8, 4 + 12 * 8, 5 + 12 * 8,
    6 + 11 * 8, 7 + 11 * 8, 6 + 12 * 8, 7 + 12 * 8,
    4 + 13 * 8, 5 + 13 * 8, 4 + 14 * 8, 5 + 14 * 8,
    6 + 13 * 8, 7 + 13 * 8, 6 + 14 * 8, 7 + 14 * 8,
    0 +  0 * 8, 0 +  5 * 8, 0 + 10 * 8
};

static av_always_inline uint32_t pack16to32(int a, int b)
{
#if HAVE_BIGENDIAN
    return (b & 0xFFFF) + (a << 16);
#else
    return (a & 0xFFFF) + (b << 16);
#endif
}

static av_always_inline uint16_t pack8to16(int a, int b)
{
#if HAVE_BIGENDIAN
    return (b & 0xFF) + (a << 8);
#else
    return (a & 0xFF) + (b << 8);
#endif
}

/**
 * Get the chroma qp.
 */
static av_always_inline int get_chroma_qp(const PPS *pps, int t, int qscale)
{
    return pps->chroma_qp_table[t][qscale];
}

/**
 * Get the predicted intra4x4 prediction mode.
 */
static av_always_inline int pred_intra_mode(const H264Context *h,
                                            H264SliceContext *sl, int n)
{
    const int index8 = scan8[n];
    const int left   = sl->intra4x4_pred_mode_cache[index8 - 1];
    const int top    = sl->intra4x4_pred_mode_cache[index8 - 8];
    const int min    = FFMIN(left, top);

    ff_tlog(h->avctx, "mode:%d %d min:%d\n", left, top, min);

    if (min < 0)
        return DC_PRED;
    else
        return min;
}

static av_always_inline void write_back_intra_pred_mode(const H264Context *h,
                                                        H264SliceContext *sl)
{
    int8_t *i4x4       = sl->intra4x4_pred_mode + h->mb2br_xy[sl->mb_xy];
    int8_t *i4x4_cache = sl->intra4x4_pred_mode_cache;

    AV_COPY32(i4x4, i4x4_cache + 4 + 8 * 4);
    i4x4[4] = i4x4_cache[7 + 8 * 3];
    i4x4[5] = i4x4_cache[7 + 8 * 2];
    i4x4[6] = i4x4_cache[7 + 8 * 1];
}

static av_always_inline void write_back_non_zero_count(const H264Context *h,
                                                       H264SliceContext *sl)
{
    const int mb_xy    = sl->mb_xy;
    uint8_t *nnz       = h->non_zero_count[mb_xy];
    uint8_t *nnz_cache = sl->non_zero_count_cache;

    AV_COPY32(&nnz[ 0], &nnz_cache[4 + 8 * 1]);
    AV_COPY32(&nnz[ 4], &nnz_cache[4 + 8 * 2]);
    AV_COPY32(&nnz[ 8], &nnz_cache[4 + 8 * 3]);
    AV_COPY32(&nnz[12], &nnz_cache[4 + 8 * 4]);
    AV_COPY32(&nnz[16], &nnz_cache[4 + 8 * 6]);
    AV_COPY32(&nnz[20], &nnz_cache[4 + 8 * 7]);
    AV_COPY32(&nnz[32], &nnz_cache[4 + 8 * 11]);
    AV_COPY32(&nnz[36], &nnz_cache[4 + 8 * 12]);

    if (!h->chroma_y_shift) {
        AV_COPY32(&nnz[24], &nnz_cache[4 + 8 * 8]);
        AV_COPY32(&nnz[28], &nnz_cache[4 + 8 * 9]);
        AV_COPY32(&nnz[40], &nnz_cache[4 + 8 * 13]);
        AV_COPY32(&nnz[44], &nnz_cache[4 + 8 * 14]);
    }
}

static av_always_inline void write_back_motion_list(const H264Context *h,
                                                    H264SliceContext *sl,
                                                    int b_stride,
                                                    int b_xy, int b8_xy,
                                                    int mb_type, int list)
{
    int16_t(*mv_dst)[2] = &h->cur_pic.motion_val[list][b_xy];
    int16_t(*mv_src)[2] = &sl->mv_cache[list][scan8[0]];
    AV_COPY128(mv_dst + 0 * b_stride, mv_src + 8 * 0);
    AV_COPY128(mv_dst + 1 * b_stride, mv_src + 8 * 1);
    AV_COPY128(mv_dst + 2 * b_stride, mv_src + 8 * 2);
    AV_COPY128(mv_dst + 3 * b_stride, mv_src + 8 * 3);
    if (CABAC(h)) {
        uint8_t (*mvd_dst)[2] = &sl->mvd_table[list][FMO ? 8 * sl->mb_xy
                                                        : h->mb2br_xy[sl->mb_xy]];
        uint8_t(*mvd_src)[2]  = &sl->mvd_cache[list][scan8[0]];
        if (IS_SKIP(mb_type)) {
            AV_ZERO128(mvd_dst);
        } else {
            AV_COPY64(mvd_dst, mvd_src + 8 * 3);
            AV_COPY16(mvd_dst + 3 + 3, mvd_src + 3 + 8 * 0);
            AV_COPY16(mvd_dst + 3 + 2, mvd_src + 3 + 8 * 1);
            AV_COPY16(mvd_dst + 3 + 1, mvd_src + 3 + 8 * 2);
        }
    }

    {
        int8_t *ref_index = &h->cur_pic.ref_index[list][b8_xy];
        int8_t *ref_cache = sl->ref_cache[list];
        ref_index[0 + 0 * 2] = ref_cache[scan8[0]];
        ref_index[1 + 0 * 2] = ref_cache[scan8[4]];
        ref_index[0 + 1 * 2] = ref_cache[scan8[8]];
        ref_index[1 + 1 * 2] = ref_cache[scan8[12]];
    }
}

static av_always_inline void write_back_motion(const H264Context *h,
                                               H264SliceContext *sl,
                                               int mb_type)
{
    const int b_stride      = h->b_stride;
    const int b_xy  = 4 * sl->mb_x + 4 * sl->mb_y * h->b_stride; // try mb2b(8)_xy
    const int b8_xy = 4 * sl->mb_xy;

    if (USES_LIST(mb_type, 0)) {
        write_back_motion_list(h, sl, b_stride, b_xy, b8_xy, mb_type, 0);
    } else {
        fill_rectangle(&h->cur_pic.ref_index[0][b8_xy],
                       2, 2, 2, (uint8_t)LIST_NOT_USED, 1);
    }
    if (USES_LIST(mb_type, 1))
        write_back_motion_list(h, sl, b_stride, b_xy, b8_xy, mb_type, 1);

    if (sl->slice_type_nos == AV_PICTURE_TYPE_B && CABAC(h)) {
        if (IS_8X8(mb_type)) {
            uint8_t *direct_table = &h->direct_table[4 * sl->mb_xy];
            direct_table[1] = sl->sub_mb_type[1] >> 1;
            direct_table[2] = sl->sub_mb_type[2] >> 1;
            direct_table[3] = sl->sub_mb_type[3] >> 1;
        }
    }
}

static av_always_inline int get_dct8x8_allowed(const H264Context *h, H264SliceContext *sl)
{
    if (h->ps.sps->direct_8x8_inference_flag)
        return !(AV_RN64A(sl->sub_mb_type) &
                 ((MB_TYPE_16x8 | MB_TYPE_8x16 | MB_TYPE_8x8) *
                  0x0001000100010001ULL));
    else
        return !(AV_RN64A(sl->sub_mb_type) &
                 ((MB_TYPE_16x8 | MB_TYPE_8x16 | MB_TYPE_8x8 | MB_TYPE_DIRECT2) *
                  0x0001000100010001ULL));
}

int ff_h264_field_end(H264Context *h, H264SliceContext *sl, int in_setup);

int ff_h264_ref_picture(H264Context *h, H264Picture *dst, H264Picture *src);
void ff_h264_unref_picture(H264Context *h, H264Picture *pic);

int ff_h264_slice_context_init(H264Context *h, H264SliceContext *sl);

void ff_h264_draw_horiz_band(const H264Context *h, H264SliceContext *sl, int y, int height);

/**
 * Submit a slice for decoding.
 *
 * Parse the slice header, starting a new field/frame if necessary. If any
 * slices are queued for the previous field, they are decoded.
 */
int ff_h264_queue_decode_slice(H264Context *h, const H2645NAL *nal);
int ff_h264_execute_decode_slices(H264Context *h);
int ff_h264_update_thread_context(AVCodecContext *dst,
                                  const AVCodecContext *src);

void ff_h264_flush_change(H264Context *h);

void ff_h264_free_tables(H264Context *h);

#endif /* AVCODEC_H264DEC_H */
OpenPOWER on IntegriCloud