FFmpeg
h264dec.h
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1 /*
2  * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
3  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * H.264 / AVC / MPEG-4 part10 codec.
25  * @author Michael Niedermayer <michaelni@gmx.at>
26  */
27 
28 #ifndef AVCODEC_H264DEC_H
29 #define AVCODEC_H264DEC_H
30 
31 #include "libavutil/buffer.h"
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/mem_internal.h"
34 #include "libavutil/thread.h"
35 
36 #include "cabac.h"
37 #include "error_resilience.h"
38 #include "h264_parse.h"
39 #include "h264_ps.h"
40 #include "h264_sei.h"
41 #include "h2645_parse.h"
42 #include "h264chroma.h"
43 #include "h264dsp.h"
44 #include "h264pred.h"
45 #include "h264qpel.h"
46 #include "internal.h"
47 #include "mpegutils.h"
48 #include "parser.h"
49 #include "qpeldsp.h"
50 #include "rectangle.h"
51 #include "videodsp.h"
52 
53 #define H264_MAX_PICTURE_COUNT 36
54 
55 #define MAX_MMCO_COUNT 66
56 
57 #define MAX_DELAYED_PIC_COUNT 16
58 
59 /* Compiling in interlaced support reduces the speed
60  * of progressive decoding by about 2%. */
61 #define ALLOW_INTERLACE
62 
63 #define FMO 0
64 
65 /**
66  * The maximum number of slices supported by the decoder.
67  * must be a power of 2
68  */
69 #define MAX_SLICES 32
70 
71 #ifdef ALLOW_INTERLACE
72 #define MB_MBAFF(h) (h)->mb_mbaff
73 #define MB_FIELD(sl) (sl)->mb_field_decoding_flag
74 #define FRAME_MBAFF(h) (h)->mb_aff_frame
75 #define FIELD_PICTURE(h) ((h)->picture_structure != PICT_FRAME)
76 #define LEFT_MBS 2
77 #define LTOP 0
78 #define LBOT 1
79 #define LEFT(i) (i)
80 #else
81 #define MB_MBAFF(h) 0
82 #define MB_FIELD(sl) 0
83 #define FRAME_MBAFF(h) 0
84 #define FIELD_PICTURE(h) 0
85 #undef IS_INTERLACED
86 #define IS_INTERLACED(mb_type) 0
87 #define LEFT_MBS 1
88 #define LTOP 0
89 #define LBOT 0
90 #define LEFT(i) 0
91 #endif
92 #define FIELD_OR_MBAFF_PICTURE(h) (FRAME_MBAFF(h) || FIELD_PICTURE(h))
93 
94 #ifndef CABAC
95 #define CABAC(h) (h)->ps.pps->cabac
96 #endif
97 
98 #define CHROMA(h) ((h)->ps.sps->chroma_format_idc)
99 #define CHROMA422(h) ((h)->ps.sps->chroma_format_idc == 2)
100 #define CHROMA444(h) ((h)->ps.sps->chroma_format_idc == 3)
101 
102 #define MB_TYPE_REF0 MB_TYPE_ACPRED // dirty but it fits in 16 bit
103 #define MB_TYPE_8x8DCT 0x01000000
104 #define IS_REF0(a) ((a) & MB_TYPE_REF0)
105 #define IS_8x8DCT(a) ((a) & MB_TYPE_8x8DCT)
106 
107 /**
108  * Memory management control operation opcode.
109  */
110 typedef enum MMCOOpcode {
111  MMCO_END = 0,
118 } MMCOOpcode;
119 
120 /**
121  * Memory management control operation.
122  */
123 typedef struct MMCO {
125  int short_pic_num; ///< pic_num without wrapping (pic_num & max_pic_num)
126  int long_arg; ///< index, pic_num, or num long refs depending on opcode
127 } MMCO;
128 
129 typedef struct H264Picture {
132 
134  int8_t *qscale_table;
135 
137  int16_t (*motion_val[2])[2];
138 
140  uint32_t *mb_type;
141 
143  void *hwaccel_picture_private; ///< hardware accelerator private data
144 
146  int8_t *ref_index[2];
147 
148  int field_poc[2]; ///< top/bottom POC
149  int poc; ///< frame POC
150  int frame_num; ///< frame_num (raw frame_num from slice header)
151  int mmco_reset; /**< MMCO_RESET set this 1. Reordering code must
152  not mix pictures before and after MMCO_RESET. */
153  int pic_id; /**< pic_num (short -> no wrap version of pic_num,
154  pic_num & max_pic_num; long -> long_pic_num) */
155  int long_ref; ///< 1->long term reference 0->short term reference
156  int ref_poc[2][2][32]; ///< POCs of the frames/fields used as reference (FIXME need per slice)
157  int ref_count[2][2]; ///< number of entries in ref_poc (FIXME need per slice)
158  int mbaff; ///< 1 -> MBAFF frame 0-> not MBAFF
159  int field_picture; ///< whether or not picture was encoded in separate fields
160 
162  int recovered; ///< picture at IDR or recovery point + recovery count
165 
167  const PPS *pps;
168 
171 } H264Picture;
172 
173 typedef struct H264Ref {
174  uint8_t *data[3];
175  int linesize[3];
176 
178  int poc;
179  int pic_id;
180 
182 } H264Ref;
183 
184 typedef struct H264SliceContext {
185  struct H264Context *h264;
188 
191  int slice_type_nos; ///< S free slice type (SI/SP are remapped to I/P)
193 
194  int qscale;
195  int chroma_qp[2]; // QPc
196  int qp_thresh; ///< QP threshold to skip loopfilter
198 
199  // deblock
200  int deblocking_filter; ///< disable_deblocking_filter_idc with 1 <-> 0
203 
205 
208 
211 
214 
219 
221  int top_type;
224 
225  const uint8_t *left_block;
227 
229  unsigned int top_samples_available;
232 
233  ptrdiff_t linesize, uvlinesize;
234  ptrdiff_t mb_linesize; ///< may be equal to s->linesize or s->linesize * 2, for mbaff
235  ptrdiff_t mb_uvlinesize;
236 
237  int mb_x, mb_y;
238  int mb_xy;
241  unsigned int first_mb_addr;
242  // index of the first MB of the next slice
246 
249  int mb_mbaff; ///< mb_aff_frame && mb_field_decoding_flag
250 
252 
253  /**
254  * number of neighbors (top and/or left) that used 8x8 dct
255  */
257 
261 
262  int cbp;
263  int top_cbp;
264  int left_cbp;
265 
268  int map_col_to_list0[2][16 + 32];
269  int map_col_to_list0_field[2][2][16 + 32];
270 
271  /**
272  * num_ref_idx_l0/1_active_minus1 + 1
273  */
274  unsigned int ref_count[2]; ///< counts frames or fields, depending on current mb mode
275  unsigned int list_count;
276  H264Ref ref_list[2][48]; /**< 0..15: frame refs, 16..47: mbaff field refs.
277  * Reordered version of default_ref_list
278  * according to picture reordering in slice header */
279  struct {
280  uint8_t op;
281  uint32_t val;
282  } ref_modifications[2][32];
284 
285  unsigned int pps_id;
286 
287  const uint8_t *intra_pcm_ptr;
288  int16_t *dc_val_base;
289 
291  uint8_t *edge_emu_buffer;
292  uint8_t (*top_borders[2])[(16 * 3) * 2];
296 
297  /**
298  * non zero coeff count cache.
299  * is 64 if not available.
300  */
301  DECLARE_ALIGNED(8, uint8_t, non_zero_count_cache)[15 * 8];
302 
303  /**
304  * Motion vector cache.
305  */
306  DECLARE_ALIGNED(16, int16_t, mv_cache)[2][5 * 8][2];
307  DECLARE_ALIGNED(8, int8_t, ref_cache)[2][5 * 8];
308  DECLARE_ALIGNED(16, uint8_t, mvd_cache)[2][5 * 8][2];
309  uint8_t direct_cache[5 * 8];
310 
311  DECLARE_ALIGNED(8, uint16_t, sub_mb_type)[4];
312 
313  ///< as a DCT coefficient is int32_t in high depth, we need to reserve twice the space.
314  DECLARE_ALIGNED(16, int16_t, mb)[16 * 48 * 2];
315  DECLARE_ALIGNED(16, int16_t, mb_luma_dc)[3][16 * 2];
316  ///< as mb is addressed by scantable[i] and scantable is uint8_t we can either
317  ///< check that i is not too large or ensure that there is some unused stuff after mb
318  int16_t mb_padding[256 * 2];
319 
320  uint8_t (*mvd_table[2])[2];
321 
322  /**
323  * Cabac
324  */
326  uint8_t cabac_state[1024];
328 
330  int nb_mmco;
332 
334  int poc_lsb;
336  int delta_poc[2];
340 
341 /**
342  * H264Context
343  */
344 typedef struct H264Context {
345  const AVClass *class;
351 
356 
360 
362 
363  int pixel_shift; ///< 0 for 8-bit H.264, 1 for high-bit-depth H.264
364 
365  /* coded dimensions -- 16 * mb w/h */
366  int width, height;
368 
371 
373  int flags;
376  /* Set when slice threading is used and at least one slice uses deblocking
377  * mode 1 (i.e. across slice boundaries). Then we disable the loop filter
378  * during normal MB decoding and execute it serially at the end.
379  */
381 
382  /*
383  * Set to 1 when the current picture is IDR, 0 otherwise.
384  */
386 
389  int crop_top;
391 
394 
395  uint8_t (*non_zero_count)[48];
396 
397 #define LIST_NOT_USED -1 // FIXME rename?
398 #define PART_NOT_AVAILABLE -2
399 
400  /**
401  * block_offset[ 0..23] for frame macroblocks
402  * block_offset[24..47] for field macroblocks
403  */
404  int block_offset[2 * (16 * 3)];
405 
406  uint32_t *mb2b_xy; // FIXME are these 4 a good idea?
407  uint32_t *mb2br_xy;
408  int b_stride; // FIXME use s->b4_stride
409 
410  uint16_t *slice_table; ///< slice_table_base + 2*mb_stride + 1
411 
412  // interlacing specific flags
416 
417  uint8_t *list_counts; ///< Array of list_count per MB specifying the slice type
418 
419  /* 0x100 -> non null luma_dc, 0x80/0x40 -> non null chroma_dc (cb/cr), 0x?0 -> chroma_cbp(0, 1, 2), 0x0? luma_cbp */
420  uint16_t *cbp_table;
421 
422  /* chroma_pred_mode for i4x4 or i16x16, else 0 */
424  uint8_t (*mvd_table[2])[2];
425  uint8_t *direct_table;
426 
427  uint8_t scan_padding[16];
428  uint8_t zigzag_scan[16];
429  uint8_t zigzag_scan8x8[64];
430  uint8_t zigzag_scan8x8_cavlc[64];
431  uint8_t field_scan[16];
432  uint8_t field_scan8x8[64];
433  uint8_t field_scan8x8_cavlc[64];
434  uint8_t zigzag_scan_q0[16];
435  uint8_t zigzag_scan8x8_q0[64];
437  uint8_t field_scan_q0[16];
438  uint8_t field_scan8x8_q0[64];
440 
441  int mb_y;
444  int mb_num;
445 
446  // =============================================================
447  // Things below are not used in the MB or more inner code
448 
451 
452  int has_slice; ///< slice NAL is found in the packet, set by decode_nal_units, its state does not need to be preserved outside h264_decode_frame()
453 
454  /**
455  * Used to parse AVC variant of H.264
456  */
457  int is_avc; ///< this flag is != 0 if codec is avc1
458  int nal_length_size; ///< Number of bytes used for nal length (1, 2 or 4)
459 
460  int bit_depth_luma; ///< luma bit depth from sps to detect changes
461  int chroma_format_idc; ///< chroma format from sps to detect changes
462 
464 
465  uint16_t *slice_table_base;
466 
468 
476 
477  /**
478  * memory management control operations buffer.
479  */
481  int nb_mmco;
484 
485  int long_ref_count; ///< number of actual long term references
486  int short_ref_count; ///< number of actual short term references
487 
488  /**
489  * @name Members for slice based multithreading
490  * @{
491  */
492  /**
493  * current slice number, used to initialize slice_num of each thread/context
494  */
496 
497  /** @} */
498 
499  /**
500  * Complement sei_pic_struct
501  * SEI_PIC_STRUCT_TOP_BOTTOM and SEI_PIC_STRUCT_BOTTOM_TOP indicate interlaced frames.
502  * However, soft telecined frames may have these values.
503  * This is used in an attempt to flag soft telecine progressive.
504  */
506 
507  /**
508  * Are the SEI recovery points looking valid.
509  */
511 
512  /**
513  * recovery_frame is the frame_num at which the next frame should
514  * be fully constructed.
515  *
516  * Set to -1 when not expecting a recovery point.
517  */
519 
520 /**
521  * We have seen an IDR, so all the following frames in coded order are correctly
522  * decodable.
523  */
524 #define FRAME_RECOVERED_IDR (1 << 0)
525 /**
526  * Sufficient number of frames have been decoded since a SEI recovery point,
527  * so all the following frames in presentation order are correct.
528  */
529 #define FRAME_RECOVERED_SEI (1 << 1)
530 
531  int frame_recovered; ///< Initial frame has been completely recovered
532 
534 
536 
537  /* for frame threading, this is set to 1
538  * after finish_setup() has been called, so we cannot modify
539  * some context properties (which are supposed to stay constant between
540  * slices) anymore */
542 
545  int16_t slice_row[MAX_SLICES]; ///< to detect when MAX_SLICES is too low
546 
547  /* original AVCodecContext dimensions, used to handle container
548  * cropping */
551 
553 
555 
560  int ref2frm[MAX_SLICES][2][64]; ///< reference to frame number lists, used in the loop filter, the first 2 are for -2,-1
561 } H264Context;
562 
563 extern const uint16_t ff_h264_mb_sizes[4];
564 
565 /**
566  * Reconstruct bitstream slice_type.
567  */
569 
570 /**
571  * Allocate tables.
572  * needs width/height
573  */
575 
579 
580 /**
581  * Execute the reference picture marking (memory management control operations).
582  */
584 
586  const H2645NAL *nal, void *logctx);
587 
589 void ff_h264_decode_init_vlc(void);
590 
591 /**
592  * Decode a macroblock
593  * @return 0 if OK, ER_AC_ERROR / ER_DC_ERROR / ER_MV_ERROR on error
594  */
596 
597 /**
598  * Decode a CABAC coded macroblock
599  * @return 0 if OK, ER_AC_ERROR / ER_DC_ERROR / ER_MV_ERROR on error
600  */
602 
604 
608  int *mb_type);
609 
610 void ff_h264_filter_mb_fast(const H264Context *h, H264SliceContext *sl, int mb_x, int mb_y,
611  uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr,
612  unsigned int linesize, unsigned int uvlinesize);
613 void ff_h264_filter_mb(const H264Context *h, H264SliceContext *sl, int mb_x, int mb_y,
614  uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr,
615  unsigned int linesize, unsigned int uvlinesize);
616 
617 /*
618  * o-o o-o
619  * / / /
620  * o-o o-o
621  * ,---'
622  * o-o o-o
623  * / / /
624  * o-o o-o
625  */
626 
627 /* Scan8 organization:
628  * 0 1 2 3 4 5 6 7
629  * 0 DY y y y y y
630  * 1 y Y Y Y Y
631  * 2 y Y Y Y Y
632  * 3 y Y Y Y Y
633  * 4 y Y Y Y Y
634  * 5 DU u u u u u
635  * 6 u U U U U
636  * 7 u U U U U
637  * 8 u U U U U
638  * 9 u U U U U
639  * 10 DV v v v v v
640  * 11 v V V V V
641  * 12 v V V V V
642  * 13 v V V V V
643  * 14 v V V V V
644  * DY/DU/DV are for luma/chroma DC.
645  */
646 
647 #define LUMA_DC_BLOCK_INDEX 48
648 #define CHROMA_DC_BLOCK_INDEX 49
649 
650 // This table must be here because scan8[constant] must be known at compiletime
651 static const uint8_t scan8[16 * 3 + 3] = {
652  4 + 1 * 8, 5 + 1 * 8, 4 + 2 * 8, 5 + 2 * 8,
653  6 + 1 * 8, 7 + 1 * 8, 6 + 2 * 8, 7 + 2 * 8,
654  4 + 3 * 8, 5 + 3 * 8, 4 + 4 * 8, 5 + 4 * 8,
655  6 + 3 * 8, 7 + 3 * 8, 6 + 4 * 8, 7 + 4 * 8,
656  4 + 6 * 8, 5 + 6 * 8, 4 + 7 * 8, 5 + 7 * 8,
657  6 + 6 * 8, 7 + 6 * 8, 6 + 7 * 8, 7 + 7 * 8,
658  4 + 8 * 8, 5 + 8 * 8, 4 + 9 * 8, 5 + 9 * 8,
659  6 + 8 * 8, 7 + 8 * 8, 6 + 9 * 8, 7 + 9 * 8,
660  4 + 11 * 8, 5 + 11 * 8, 4 + 12 * 8, 5 + 12 * 8,
661  6 + 11 * 8, 7 + 11 * 8, 6 + 12 * 8, 7 + 12 * 8,
662  4 + 13 * 8, 5 + 13 * 8, 4 + 14 * 8, 5 + 14 * 8,
663  6 + 13 * 8, 7 + 13 * 8, 6 + 14 * 8, 7 + 14 * 8,
664  0 + 0 * 8, 0 + 5 * 8, 0 + 10 * 8
665 };
666 
667 static av_always_inline uint32_t pack16to32(unsigned a, unsigned b)
668 {
669 #if HAVE_BIGENDIAN
670  return (b & 0xFFFF) + (a << 16);
671 #else
672  return (a & 0xFFFF) + (b << 16);
673 #endif
674 }
675 
676 static av_always_inline uint16_t pack8to16(unsigned a, unsigned b)
677 {
678 #if HAVE_BIGENDIAN
679  return (b & 0xFF) + (a << 8);
680 #else
681  return (a & 0xFF) + (b << 8);
682 #endif
683 }
684 
685 /**
686  * Get the chroma qp.
687  */
688 static av_always_inline int get_chroma_qp(const PPS *pps, int t, int qscale)
689 {
690  return pps->chroma_qp_table[t][qscale];
691 }
692 
693 /**
694  * Get the predicted intra4x4 prediction mode.
695  */
697  H264SliceContext *sl, int n)
698 {
699  const int index8 = scan8[n];
700  const int left = sl->intra4x4_pred_mode_cache[index8 - 1];
701  const int top = sl->intra4x4_pred_mode_cache[index8 - 8];
702  const int min = FFMIN(left, top);
703 
704  ff_tlog(h->avctx, "mode:%d %d min:%d\n", left, top, min);
705 
706  if (min < 0)
707  return DC_PRED;
708  else
709  return min;
710 }
711 
713  H264SliceContext *sl)
714 {
715  int8_t *i4x4 = sl->intra4x4_pred_mode + h->mb2br_xy[sl->mb_xy];
716  int8_t *i4x4_cache = sl->intra4x4_pred_mode_cache;
717 
718  AV_COPY32(i4x4, i4x4_cache + 4 + 8 * 4);
719  i4x4[4] = i4x4_cache[7 + 8 * 3];
720  i4x4[5] = i4x4_cache[7 + 8 * 2];
721  i4x4[6] = i4x4_cache[7 + 8 * 1];
722 }
723 
725  H264SliceContext *sl)
726 {
727  const int mb_xy = sl->mb_xy;
728  uint8_t *nnz = h->non_zero_count[mb_xy];
729  uint8_t *nnz_cache = sl->non_zero_count_cache;
730 
731  AV_COPY32(&nnz[ 0], &nnz_cache[4 + 8 * 1]);
732  AV_COPY32(&nnz[ 4], &nnz_cache[4 + 8 * 2]);
733  AV_COPY32(&nnz[ 8], &nnz_cache[4 + 8 * 3]);
734  AV_COPY32(&nnz[12], &nnz_cache[4 + 8 * 4]);
735  AV_COPY32(&nnz[16], &nnz_cache[4 + 8 * 6]);
736  AV_COPY32(&nnz[20], &nnz_cache[4 + 8 * 7]);
737  AV_COPY32(&nnz[32], &nnz_cache[4 + 8 * 11]);
738  AV_COPY32(&nnz[36], &nnz_cache[4 + 8 * 12]);
739 
740  if (!h->chroma_y_shift) {
741  AV_COPY32(&nnz[24], &nnz_cache[4 + 8 * 8]);
742  AV_COPY32(&nnz[28], &nnz_cache[4 + 8 * 9]);
743  AV_COPY32(&nnz[40], &nnz_cache[4 + 8 * 13]);
744  AV_COPY32(&nnz[44], &nnz_cache[4 + 8 * 14]);
745  }
746 }
747 
749  H264SliceContext *sl,
750  int b_stride,
751  int b_xy, int b8_xy,
752  int mb_type, int list)
753 {
754  int16_t(*mv_dst)[2] = &h->cur_pic.motion_val[list][b_xy];
755  int16_t(*mv_src)[2] = &sl->mv_cache[list][scan8[0]];
756  AV_COPY128(mv_dst + 0 * b_stride, mv_src + 8 * 0);
757  AV_COPY128(mv_dst + 1 * b_stride, mv_src + 8 * 1);
758  AV_COPY128(mv_dst + 2 * b_stride, mv_src + 8 * 2);
759  AV_COPY128(mv_dst + 3 * b_stride, mv_src + 8 * 3);
760  if (CABAC(h)) {
761  uint8_t (*mvd_dst)[2] = &sl->mvd_table[list][FMO ? 8 * sl->mb_xy
762  : h->mb2br_xy[sl->mb_xy]];
763  uint8_t(*mvd_src)[2] = &sl->mvd_cache[list][scan8[0]];
764  if (IS_SKIP(mb_type)) {
765  AV_ZERO128(mvd_dst);
766  } else {
767  AV_COPY64(mvd_dst, mvd_src + 8 * 3);
768  AV_COPY16(mvd_dst + 3 + 3, mvd_src + 3 + 8 * 0);
769  AV_COPY16(mvd_dst + 3 + 2, mvd_src + 3 + 8 * 1);
770  AV_COPY16(mvd_dst + 3 + 1, mvd_src + 3 + 8 * 2);
771  }
772  }
773 
774  {
775  int8_t *ref_index = &h->cur_pic.ref_index[list][b8_xy];
776  int8_t *ref_cache = sl->ref_cache[list];
777  ref_index[0 + 0 * 2] = ref_cache[scan8[0]];
778  ref_index[1 + 0 * 2] = ref_cache[scan8[4]];
779  ref_index[0 + 1 * 2] = ref_cache[scan8[8]];
780  ref_index[1 + 1 * 2] = ref_cache[scan8[12]];
781  }
782 }
783 
785  H264SliceContext *sl,
786  int mb_type)
787 {
788  const int b_stride = h->b_stride;
789  const int b_xy = 4 * sl->mb_x + 4 * sl->mb_y * h->b_stride; // try mb2b(8)_xy
790  const int b8_xy = 4 * sl->mb_xy;
791 
792  if (USES_LIST(mb_type, 0)) {
793  write_back_motion_list(h, sl, b_stride, b_xy, b8_xy, mb_type, 0);
794  } else {
795  fill_rectangle(&h->cur_pic.ref_index[0][b8_xy],
796  2, 2, 2, (uint8_t)LIST_NOT_USED, 1);
797  }
798  if (USES_LIST(mb_type, 1))
799  write_back_motion_list(h, sl, b_stride, b_xy, b8_xy, mb_type, 1);
800 
801  if (sl->slice_type_nos == AV_PICTURE_TYPE_B && CABAC(h)) {
802  if (IS_8X8(mb_type)) {
803  uint8_t *direct_table = &h->direct_table[4 * sl->mb_xy];
804  direct_table[1] = sl->sub_mb_type[1] >> 1;
805  direct_table[2] = sl->sub_mb_type[2] >> 1;
806  direct_table[3] = sl->sub_mb_type[3] >> 1;
807  }
808  }
809 }
810 
812 {
813  if (h->ps.sps->direct_8x8_inference_flag)
814  return !(AV_RN64A(sl->sub_mb_type) &
816  0x0001000100010001ULL));
817  else
818  return !(AV_RN64A(sl->sub_mb_type) &
820  0x0001000100010001ULL));
821 }
822 
823 static inline int find_start_code(const uint8_t *buf, int buf_size,
824  int buf_index, int next_avc)
825 {
826  uint32_t state = -1;
827 
828  buf_index = avpriv_find_start_code(buf + buf_index, buf + next_avc + 1, &state) - buf - 1;
829 
830  return FFMIN(buf_index, buf_size);
831 }
832 
833 int ff_h264_field_end(H264Context *h, H264SliceContext *sl, int in_setup);
834 
837 
839 
840 void ff_h264_draw_horiz_band(const H264Context *h, H264SliceContext *sl, int y, int height);
841 
842 /**
843  * Submit a slice for decoding.
844  *
845  * Parse the slice header, starting a new field/frame if necessary. If any
846  * slices are queued for the previous field, they are decoded.
847  */
851  const AVCodecContext *src);
853  const AVCodecContext *src);
854 
856 
858 
860 
861 #endif /* AVCODEC_H264DEC_H */
H264Context::missing_fields
int missing_fields
Definition: h264dec.h:535
H264Context::context_initialized
int context_initialized
Definition: h264dec.h:372
H264Context::mb_num
int mb_num
Definition: h264dec.h:444
MMCO::opcode
MMCOOpcode opcode
Definition: h264dec.h:124
H264Context::nb_slice_ctx_queued
int nb_slice_ctx_queued
Definition: h264dec.h:359
IS_8X8
#define IS_8X8(a)
Definition: mpegutils.h:88
H264SliceContext::mb_xy
int mb_xy
Definition: h264dec.h:238
CABAC
#define CABAC(h)
Definition: h264dec.h:95
H264SliceContext::nb_ref_modifications
int nb_ref_modifications[2]
Definition: h264dec.h:283
MMCO::long_arg
int long_arg
index, pic_num, or num long refs depending on opcode
Definition: h264dec.h:126
MMCO_RESET
@ MMCO_RESET
Definition: h264dec.h:116
H264Context::picture_structure
int picture_structure
Definition: h264dec.h:414
H264Context::slice_table_base
uint16_t * slice_table_base
Definition: h264dec.h:465
H264SliceContext::ref_cache
int8_t ref_cache[2][5 *8]
Definition: h264dec.h:307
H264SliceContext::topleft_samples_available
unsigned int topleft_samples_available
Definition: h264dec.h:228
H264Context::explicit_ref_marking
int explicit_ref_marking
Definition: h264dec.h:483
H264Context::pixel_shift
int pixel_shift
0 for 8-bit H.264, 1 for high-bit-depth H.264
Definition: h264dec.h:363
H264SliceContext::max_pic_num
int max_pic_num
Definition: h264dec.h:338
h2645_parse.h
H264SliceContext::nb_mmco
int nb_mmco
Definition: h264dec.h:330
cabac.h
H264SliceContext::intra_pcm_ptr
const uint8_t * intra_pcm_ptr
Definition: h264dec.h:287
ff_h264_update_thread_context_for_user
int ff_h264_update_thread_context_for_user(AVCodecContext *dst, const AVCodecContext *src)
Definition: h264_slice.c:468
H264Picture::poc
int poc
frame POC
Definition: h264dec.h:149
H264Context::cbp_table
uint16_t * cbp_table
Definition: h264dec.h:420
H264Picture::f
AVFrame * f
Definition: h264dec.h:130
mem_internal.h
H264Context::h264dsp
H264DSPContext h264dsp
Definition: h264dec.h:348
H264Context::ref_index_pool
AVBufferPool * ref_index_pool
Definition: h264dec.h:559
AVBufferPool
The buffer pool.
Definition: buffer_internal.h:78
H264Context::slice_ctx
H264SliceContext * slice_ctx
Definition: h264dec.h:357
thread.h
H264Context::flags
int flags
Definition: h264dec.h:373
H264Ref
Definition: h264dec.h:173
H264Picture::ref_count
int ref_count[2][2]
number of entries in ref_poc (FIXME need per slice)
Definition: h264dec.h:157
H264SliceContext::topright_mb_xy
int topright_mb_xy
Definition: h264dec.h:217
find_start_code
static int find_start_code(const uint8_t *buf, int buf_size, int buf_index, int next_avc)
Definition: h264dec.h:823
H264Picture::ref_index
int8_t * ref_index[2]
Definition: h264dec.h:146
H264SliceContext::mb
int16_t mb[16 *48 *2]
Definition: h264dec.h:314
MB_TYPE_16x8
#define MB_TYPE_16x8
Definition: mpegutils.h:54
H264SliceContext::mvd_table
uint8_t(*[2] mvd_table)[2]
Definition: h264dec.h:320
H264Context::b_stride
int b_stride
Definition: h264dec.h:408
H264Picture::pps
const PPS * pps
Definition: h264dec.h:167
ff_h264_set_erpic
void ff_h264_set_erpic(ERPicture *dst, H264Picture *src)
Definition: h264_picture.c:136
H264Context::motion_val_pool
AVBufferPool * motion_val_pool
Definition: h264dec.h:558
ff_h264_flush_change
void ff_h264_flush_change(H264Context *h)
Definition: h264dec.c:439
h264_parse.h
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
H264Context::recovery_frame
int recovery_frame
recovery_frame is the frame_num at which the next frame should be fully constructed.
Definition: h264dec.h:518
internal.h
H264SliceContext::topleft_partition
int topleft_partition
Definition: h264dec.h:226
DC_PRED
@ DC_PRED
Definition: vp9.h:48
ff_h264_execute_ref_pic_marking
int ff_h264_execute_ref_pic_marking(H264Context *h)
Execute the reference picture marking (memory management control operations).
Definition: h264_refs.c:610
b
#define b
Definition: input.c:40
ff_h264_decode_mb_cabac
int ff_h264_decode_mb_cabac(const H264Context *h, H264SliceContext *sl)
Decode a CABAC coded macroblock.
Definition: h264_cabac.c:1910
H264SliceContext::mmco
MMCO mmco[MAX_MMCO_COUNT]
Definition: h264dec.h:329
H264SliceContext::val
uint32_t val
Definition: h264dec.h:281
H264Ref::pic_id
int pic_id
Definition: h264dec.h:179
H264SliceContext::ref_count
unsigned int ref_count[2]
num_ref_idx_l0/1_active_minus1 + 1
Definition: h264dec.h:274
H264Context::nal_unit_type
int nal_unit_type
Definition: h264dec.h:450
H264SliceContext::left_block
const uint8_t * left_block
Definition: h264dec.h:225
H264Picture::qscale_table
int8_t * qscale_table
Definition: h264dec.h:134
H264SliceContext::h264
struct H264Context * h264
Definition: h264dec.h:185
H264SliceContext::left_mb_xy
int left_mb_xy[LEFT_MBS]
Definition: h264dec.h:218
ERContext
Definition: error_resilience.h:53
H264Context::nb_mmco
int nb_mmco
Definition: h264dec.h:481
H264Context::delayed_pic
H264Picture * delayed_pic[MAX_DELAYED_PIC_COUNT+2]
Definition: h264dec.h:472
H264Context::setup_finished
int setup_finished
Definition: h264dec.h:541
ff_tlog
#define ff_tlog(ctx,...)
Definition: internal.h:97
avpriv_find_start_code
const uint8_t * avpriv_find_start_code(const uint8_t *p, const uint8_t *end, uint32_t *state)
H264Picture::ref_index_buf
AVBufferRef * ref_index_buf[2]
Definition: h264dec.h:145
H264Context::field_scan8x8_cavlc
uint8_t field_scan8x8_cavlc[64]
Definition: h264dec.h:433
H264SliceContext::sub_mb_type
uint16_t sub_mb_type[4]
as a DCT coefficient is int32_t in high depth, we need to reserve twice the space.
Definition: h264dec.h:311
ff_h264_draw_horiz_band
void ff_h264_draw_horiz_band(const H264Context *h, H264SliceContext *sl, int y, int height)
Definition: h264dec.c:103
ff_h264_alloc_tables
int ff_h264_alloc_tables(H264Context *h)
Allocate tables.
Definition: h264dec.c:181
H264SliceContext::is_complex
int is_complex
Definition: h264dec.h:245
DPB
Decoded Picture Buffer (DPB).
Definition: vaapi_h264.c:82
H264Context::valid_recovery_point
int valid_recovery_point
Are the SEI recovery points looking valid.
Definition: h264dec.h:510
H264Context::field_scan8x8_q0
uint8_t field_scan8x8_q0[64]
Definition: h264dec.h:438
mpegutils.h
H264Picture::invalid_gap
int invalid_gap
Definition: h264dec.h:163
H264Picture::pps_buf
AVBufferRef * pps_buf
Definition: h264dec.h:166
H264SliceContext::dist_scale_factor
int dist_scale_factor[32]
Definition: h264dec.h:266
H264Context::height_from_caller
int height_from_caller
Definition: h264dec.h:550
MMCO_LONG
@ MMCO_LONG
Definition: h264dec.h:117
ff_h264_ref_picture
int ff_h264_ref_picture(H264Context *h, H264Picture *dst, H264Picture *src)
Definition: h264_picture.c:66
H264SliceContext::mb_x
int mb_x
Definition: h264dec.h:237
ERPicture
Definition: error_resilience.h:41
H264Picture::frame_num
int frame_num
frame_num (raw frame_num from slice header)
Definition: h264dec.h:150
H264SliceContext::next_slice_idx
int next_slice_idx
Definition: h264dec.h:243
H264SliceContext
Definition: h264dec.h:184
H264SliceContext::mb_padding
int16_t mb_padding[256 *2]
Definition: h264dec.h:318
H264Context::cur_pic
H264Picture cur_pic
Definition: h264dec.h:354
ff_h264_slice_context_init
int ff_h264_slice_context_init(H264Context *h, H264SliceContext *sl)
Init context Allocate buffers which are not shared amongst multiple threads.
Definition: h264dec.c:222
H264SliceContext::mv_cache
int16_t mv_cache[2][5 *8][2]
Motion vector cache.
Definition: h264dec.h:306
H264Context::chroma_pred_mode_table
uint8_t * chroma_pred_mode_table
Definition: h264dec.h:423
h264qpel.h
H264SliceContext::mvd_cache
uint8_t mvd_cache[2][5 *8][2]
Definition: h264dec.h:308
H264SliceContext::map_col_to_list0
int map_col_to_list0[2][16+32]
Definition: h264dec.h:268
H264SliceContext::map_col_to_list0_field
int map_col_to_list0_field[2][2][16+32]
Definition: h264dec.h:269
ff_h264_remove_all_refs
void ff_h264_remove_all_refs(H264Context *h)
Definition: h264_refs.c:565
get_chroma_qp
static av_always_inline int get_chroma_qp(const PPS *pps, int t, int qscale)
Get the chroma qp.
Definition: h264dec.h:688
H264Picture::mmco_reset
int mmco_reset
MMCO_RESET set this 1.
Definition: h264dec.h:151
H264Picture::ref_poc
int ref_poc[2][2][32]
POCs of the frames/fields used as reference (FIXME need per slice)
Definition: h264dec.h:156
H264Context::cur_pic_ptr
H264Picture * cur_pic_ptr
Definition: h264dec.h:353
GetBitContext
Definition: get_bits.h:62
H264Context::mmco
MMCO mmco[MAX_MMCO_COUNT]
memory management control operations buffer.
Definition: h264dec.h:480
H264SliceContext::er
ERContext er
Definition: h264dec.h:187
H264Context::mb_stride
int mb_stride
Definition: h264dec.h:443
USES_LIST
#define USES_LIST(a, list)
Definition: mpegutils.h:98
ff_h264_execute_decode_slices
int ff_h264_execute_decode_slices(H264Context *h)
Call decode_slice() for each context.
Definition: h264_slice.c:2863
H264Context::mb_y
int mb_y
Definition: h264dec.h:441
H264Context::nb_slice_ctx
int nb_slice_ctx
Definition: h264dec.h:358
H264Picture::mb_stride
int mb_stride
Definition: h264dec.h:170
H264SliceContext::deblocking_filter
int deblocking_filter
disable_deblocking_filter_idc with 1 <-> 0
Definition: h264dec.h:200
H264SliceContext::picture_structure
int picture_structure
Definition: h264dec.h:247
H264SliceContext::direct_spatial_mv_pred
int direct_spatial_mv_pred
Definition: h264dec.h:258
H264Context::avctx
AVCodecContext * avctx
Definition: h264dec.h:346
ff_h264_unref_picture
void ff_h264_unref_picture(H264Context *h, H264Picture *pic)
Definition: h264_picture.c:44
H264Ref::data
uint8_t * data[3]
Definition: h264dec.h:174
H264SliceContext::slice_num
int slice_num
Definition: h264dec.h:189
H264Context::chroma_format_idc
int chroma_format_idc
chroma format from sps to detect changes
Definition: h264dec.h:461
H264Context::qscale_table_pool
AVBufferPool * qscale_table_pool
Definition: h264dec.h:556
H264SliceContext::dc_val_base
int16_t * dc_val_base
Definition: h264dec.h:288
H264Picture::mbaff
int mbaff
1 -> MBAFF frame 0-> not MBAFF
Definition: h264dec.h:158
H264Context::width
int width
Definition: h264dec.h:366
H264SliceContext::topleft_mb_xy
int topleft_mb_xy
Definition: h264dec.h:215
intreadwrite.h
H264Context::last_pocs
int last_pocs[MAX_DELAYED_PIC_COUNT]
Definition: h264dec.h:473
H264Context::postpone_filter
int postpone_filter
Definition: h264dec.h:380
H264Context::short_ref_count
int short_ref_count
number of actual short term references
Definition: h264dec.h:486
H264SliceContext::next_mb_skipped
int next_mb_skipped
Definition: h264dec.h:207
H264Context::crop_top
int crop_top
Definition: h264dec.h:389
pred_intra_mode
static av_always_inline int pred_intra_mode(const H264Context *h, H264SliceContext *sl, int n)
Get the predicted intra4x4 prediction mode.
Definition: h264dec.h:696
H264Context::zigzag_scan8x8
uint8_t zigzag_scan8x8[64]
Definition: h264dec.h:429
H264Ref::parent
H264Picture * parent
Definition: h264dec.h:181
MMCO_SHORT2LONG
@ MMCO_SHORT2LONG
Definition: h264dec.h:114
IS_SKIP
#define IS_SKIP(a)
Definition: mpegutils.h:80
H264SliceContext::slice_alpha_c0_offset
int slice_alpha_c0_offset
Definition: h264dec.h:201
H264Context::crop_bottom
int crop_bottom
Definition: h264dec.h:390
ff_h264_direct_dist_scale_factor
void ff_h264_direct_dist_scale_factor(const H264Context *const h, H264SliceContext *sl)
Definition: h264_direct.c:62
ff_h264_get_slice_type
int ff_h264_get_slice_type(const H264SliceContext *sl)
Reconstruct bitstream slice_type.
Definition: h264_slice.c:2279
H264SliceContext::slice_type
int slice_type
Definition: h264dec.h:190
MMCO::short_pic_num
int short_pic_num
pic_num without wrapping (pic_num & max_pic_num)
Definition: h264dec.h:125
H264SliceContext::resync_mb_x
int resync_mb_x
Definition: h264dec.h:239
H264Picture::sei_recovery_frame_cnt
int sei_recovery_frame_cnt
Definition: h264dec.h:164
H264Context::enable_er
int enable_er
Definition: h264dec.h:552
ff_h264_init_cabac_states
void ff_h264_init_cabac_states(const H264Context *h, H264SliceContext *sl)
Definition: h264_cabac.c:1261
H264Context::mvd_table
uint8_t(*[2] mvd_table)[2]
Definition: h264dec.h:424
H264SliceContext::curr_pic_num
int curr_pic_num
Definition: h264dec.h:337
MB_TYPE_8x16
#define MB_TYPE_8x16
Definition: mpegutils.h:55
H264SliceContext::topright_samples_available
unsigned int topright_samples_available
Definition: h264dec.h:230
H264Context::last_pic_for_ec
H264Picture last_pic_for_ec
Definition: h264dec.h:355
H264Context::mb_type_pool
AVBufferPool * mb_type_pool
Definition: h264dec.h:557
H264Context::zigzag_scan8x8_cavlc
uint8_t zigzag_scan8x8_cavlc[64]
Definition: h264dec.h:430
H264Context::non_zero_count
uint8_t(* non_zero_count)[48]
Definition: h264dec.h:395
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
H264Picture::motion_val_buf
AVBufferRef * motion_val_buf[2]
Definition: h264dec.h:136
H264Context::hpc
H264PredContext hpc
Definition: h264dec.h:393
AV_COPY128
#define AV_COPY128(d, s)
Definition: intreadwrite.h:609
H264SEIContext
Definition: h264_sei.h:189
AV_COPY64
#define AV_COPY64(d, s)
Definition: intreadwrite.h:605
H264SliceContext::edge_emu_buffer
uint8_t * edge_emu_buffer
Definition: h264dec.h:291
H264Context::pkt
H2645Packet pkt
Definition: h264dec.h:361
H264Context::next_outputed_poc
int next_outputed_poc
Definition: h264dec.h:475
H264Context::long_ref_count
int long_ref_count
number of actual long term references
Definition: h264dec.h:485
H264Ref::linesize
int linesize[3]
Definition: h264dec.h:175
H264Context::mb_width
int mb_width
Definition: h264dec.h:442
state
static struct @317 state
H264SliceContext::ref_modifications
struct H264SliceContext::@64 ref_modifications[2][32]
MB_TYPE_8x8
#define MB_TYPE_8x8
Definition: mpegutils.h:56
H264SliceContext::chroma_qp
int chroma_qp[2]
Definition: h264dec.h:195
src
#define src
Definition: vp8dsp.c:255
h264dsp.h
PPS
Picture parameter set.
Definition: h264_ps.h:111
H264Context::ref2frm
int ref2frm[MAX_SLICES][2][64]
reference to frame number lists, used in the loop filter, the first 2 are for -2,-1
Definition: h264dec.h:560
list
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining list
Definition: filter_design.txt:25
ff_h264_decode_ref_pic_list_reordering
int ff_h264_decode_ref_pic_list_reordering(H264SliceContext *sl, void *logctx)
Definition: h264_refs.c:423
H264SliceContext::top_samples_available
unsigned int top_samples_available
Definition: h264dec.h:229
H264Context::h264qpel
H264QpelContext h264qpel
Definition: h264dec.h:350
qpeldsp.h
H264Picture::mb_height
int mb_height
Definition: h264dec.h:169
H264SliceContext::mb_luma_dc
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 lar...
Definition: h264dec.h:315
H264SliceContext::qscale
int qscale
Definition: h264dec.h:194
write_back_motion
static av_always_inline void write_back_motion(const H264Context *h, H264SliceContext *sl, int mb_type)
Definition: h264dec.h:784
AV_ZERO128
#define AV_ZERO128(d)
Definition: intreadwrite.h:637
H264SliceContext::top_borders_allocated
int top_borders_allocated[2]
Definition: h264dec.h:295
ff_h264_mb_sizes
const uint16_t ff_h264_mb_sizes[4]
Definition: h264dec.c:59
H264SliceContext::mb_skip_run
int mb_skip_run
Definition: h264dec.h:244
h264_ps.h
H264SliceContext::cabac_state
uint8_t cabac_state[1024]
Definition: h264dec.h:326
H264SliceContext::top_type
int top_type
Definition: h264dec.h:221
H264Context::bit_depth_luma
int bit_depth_luma
luma bit depth from sps to detect changes
Definition: h264dec.h:460
get_dct8x8_allowed
static av_always_inline int get_dct8x8_allowed(const H264Context *h, H264SliceContext *sl)
Definition: h264dec.h:811
H264Context::frame_recovered
int frame_recovered
Initial frame has been completely recovered.
Definition: h264dec.h:531
H264Context::has_slice
int has_slice
slice NAL is found in the packet, set by decode_nal_units, its state does not need to be preserved ou...
Definition: h264dec.h:452
H264Context::next_output_pic
H264Picture * next_output_pic
Definition: h264dec.h:474
H264SliceContext::resync_mb_y
int resync_mb_y
Definition: h264dec.h:240
ff_h264_pred_direct_motion
void ff_h264_pred_direct_motion(const H264Context *const h, H264SliceContext *sl, int *mb_type)
Definition: h264_direct.c:721
H264Context::picture_idr
int picture_idr
Definition: h264dec.h:385
ff_h264_direct_ref_list_init
void ff_h264_direct_ref_list_init(const H264Context *const h, H264SliceContext *sl)
Definition: h264_direct.c:121
H264DSPContext
Context for storing H.264 DSP functions.
Definition: h264dsp.h:42
H264Picture::pic_id
int pic_id
pic_num (short -> no wrap version of pic_num, pic_num & max_pic_num; long -> long_pic_num)
Definition: h264dec.h:153
H264SliceContext::cabac
CABACContext cabac
Cabac.
Definition: h264dec.h:325
H264SliceContext::redundant_pic_count
int redundant_pic_count
Definition: h264dec.h:251
H264SliceContext::intra4x4_pred_mode_cache
int8_t intra4x4_pred_mode_cache[5 *8]
Definition: h264dec.h:212
H264Context::long_ref
H264Picture * long_ref[32]
Definition: h264dec.h:471
H264Context::mb_aff_frame
int mb_aff_frame
Definition: h264dec.h:413
H264Context::crop_left
int crop_left
Definition: h264dec.h:387
H264Picture::reference
int reference
Definition: h264dec.h:161
H264Context::poc
H264POCContext poc
Definition: h264dec.h:467
H264Context::vdsp
VideoDSPContext vdsp
Definition: h264dec.h:347
LEFT_MBS
#define LEFT_MBS
Definition: h264dec.h:76
pps
static int FUNC() pps(CodedBitstreamContext *ctx, RWContext *rw, H264RawPPS *current)
Definition: cbs_h264_syntax_template.c:404
H264Context::block_offset
int block_offset[2 *(16 *3)]
block_offset[ 0..23] for frame macroblocks block_offset[24..47] for field macroblocks
Definition: h264dec.h:404
rectangle.h
MMCO_LONG2UNUSED
@ MMCO_LONG2UNUSED
Definition: h264dec.h:113
H264SliceContext::mb_uvlinesize
ptrdiff_t mb_uvlinesize
Definition: h264dec.h:235
H264SliceContext::pwt
H264PredWeightTable pwt
Definition: h264dec.h:204
MAX_DELAYED_PIC_COUNT
#define MAX_DELAYED_PIC_COUNT
Definition: h264dec.h:57
H264Picture::tf
ThreadFrame tf
Definition: h264dec.h:131
H264Picture::mb_type
uint32_t * mb_type
Definition: h264dec.h:140
H264SliceContext::intra16x16_pred_mode
int intra16x16_pred_mode
Definition: h264dec.h:210
H264Context::has_recovery_point
int has_recovery_point
Definition: h264dec.h:533
H264Picture::recovered
int recovered
picture at IDR or recovery point + recovery count
Definition: h264dec.h:162
H264Context::zigzag_scan8x8_cavlc_q0
uint8_t zigzag_scan8x8_cavlc_q0[64]
Definition: h264dec.h:436
H264SliceContext::top_mb_xy
int top_mb_xy
Definition: h264dec.h:216
H264SliceContext::qp_thresh
int qp_thresh
QP threshold to skip loopfilter.
Definition: h264dec.h:196
MMCOOpcode
MMCOOpcode
Memory management control operation opcode.
Definition: h264dec.h:110
H264Context::chroma_x_shift
int chroma_x_shift
Definition: h264dec.h:367
H264Context::sei
H264SEIContext sei
Definition: h264dec.h:554
H2645NAL
Definition: h2645_parse.h:34
H264SliceContext::top_borders
uint8_t(*[2] top_borders)[(16 *3) *2]
Definition: h264dec.h:292
h264chroma.h
AV_RN64A
#define AV_RN64A(p)
Definition: intreadwrite.h:530
H264Context::direct_table
uint8_t * direct_table
Definition: h264dec.h:425
H264SliceContext::cbp
int cbp
Definition: h264dec.h:262
H264Context::prev_interlaced_frame
int prev_interlaced_frame
Complement sei_pic_struct SEI_PIC_STRUCT_TOP_BOTTOM and SEI_PIC_STRUCT_BOTTOM_TOP indicate interlaced...
Definition: h264dec.h:505
ff_h264_queue_decode_slice
int ff_h264_queue_decode_slice(H264Context *h, const H2645NAL *nal)
Submit a slice for decoding.
Definition: h264_slice.c:2154
pack8to16
static av_always_inline uint16_t pack8to16(unsigned a, unsigned b)
Definition: h264dec.h:676
H264SliceContext::left_type
int left_type[LEFT_MBS]
Definition: h264dec.h:223
buffer.h
H264SliceContext::mb_y
int mb_y
Definition: h264dec.h:237
height
#define height
H264SliceContext::explicit_ref_marking
int explicit_ref_marking
Definition: h264dec.h:331
FFMIN
#define FFMIN(a, b)
Definition: common.h:105
a
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:41
MMCO_SET_MAX_LONG
@ MMCO_SET_MAX_LONG
Definition: h264dec.h:115
H264Context::mmco_reset
int mmco_reset
Definition: h264dec.h:482
H264SliceContext::uvlinesize
ptrdiff_t uvlinesize
Definition: h264dec.h:233
H264SliceContext::slice_type_nos
int slice_type_nos
S free slice type (SI/SP are remapped to I/P)
Definition: h264dec.h:191
H264Context::ps
H264ParamSets ps
Definition: h264dec.h:463
H264SliceContext::delta_poc_bottom
int delta_poc_bottom
Definition: h264dec.h:335
H264Context::field_scan_q0
uint8_t field_scan_q0[16]
Definition: h264dec.h:437
pack16to32
static av_always_inline uint32_t pack16to32(unsigned a, unsigned b)
Definition: h264dec.h:667
H264Context::height
int height
Definition: h264dec.h:366
H264SliceContext::mb_mbaff
int mb_mbaff
mb_aff_frame && mb_field_decoding_flag
Definition: h264dec.h:249
ff_h264_filter_mb
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)
Definition: h264_loopfilter.c:719
H264Context::default_ref
H264Ref default_ref[2]
Definition: h264dec.h:469
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:116
AV_COPY16
#define AV_COPY16(d, s)
Definition: intreadwrite.h:597
h264_sei.h
LIST_NOT_USED
#define LIST_NOT_USED
Definition: h264dec.h:397
H264Picture::field_picture
int field_picture
whether or not picture was encoded in separate fields
Definition: h264dec.h:159
H264Context::intra4x4_pred_mode
int8_t * intra4x4_pred_mode
Definition: h264dec.h:392
H264SliceContext::poc_lsb
int poc_lsb
Definition: h264dec.h:334
H264SliceContext::chroma_pred_mode
int chroma_pred_mode
Definition: h264dec.h:209
H264SliceContext::first_mb_addr
unsigned int first_mb_addr
Definition: h264dec.h:241
H264SliceContext::top_cbp
int top_cbp
Definition: h264dec.h:263
H264SliceContext::topleft_type
int topleft_type
Definition: h264dec.h:220
ff_h264_field_end
int ff_h264_field_end(H264Context *h, H264SliceContext *sl, int in_setup)
Definition: h264_picture.c:159
ff_h264_free_tables
void ff_h264_free_tables(H264Context *h)
Definition: h264dec.c:138
H264Context
H264Context.
Definition: h264dec.h:344
ff_h264_decode_mb_cavlc
int ff_h264_decode_mb_cavlc(const H264Context *h, H264SliceContext *sl)
Decode a macroblock.
Definition: h264_cavlc.c:696
H264SliceContext::frame_num
int frame_num
Definition: h264dec.h:333
H264POCContext
Definition: h264_parse.h:43
H264SliceContext::col_fieldoff
int col_fieldoff
Definition: h264dec.h:260
H264SliceContext::mb_linesize
ptrdiff_t mb_linesize
may be equal to s->linesize or s->linesize * 2, for mbaff
Definition: h264dec.h:234
av_always_inline
#define av_always_inline
Definition: attributes.h:49
H264Context::nal_ref_idc
int nal_ref_idc
Definition: h264dec.h:449
H264Context::coded_picture_number
int coded_picture_number
Definition: h264dec.h:370
H264Picture::hwaccel_priv_buf
AVBufferRef * hwaccel_priv_buf
Definition: h264dec.h:142
AV_COPY32
#define AV_COPY32(d, s)
Definition: intreadwrite.h:601
H264Context::mb_height
int mb_height
Definition: h264dec.h:442
parser.h
H264Context::cur_chroma_format_idc
int cur_chroma_format_idc
Definition: h264dec.h:543
H264QpelContext
Definition: h264qpel.h:27
H264Context::crop_right
int crop_right
Definition: h264dec.h:388
H264SliceContext::list_count
unsigned int list_count
Definition: h264dec.h:275
H264Context::field_scan8x8_cavlc_q0
uint8_t field_scan8x8_cavlc_q0[64]
Definition: h264dec.h:439
H264Context::list_counts
uint8_t * list_counts
Array of list_count per MB specifying the slice type.
Definition: h264dec.h:417
H264Context::workaround_bugs
int workaround_bugs
Definition: h264dec.h:374
MAX_SLICES
#define MAX_SLICES
The maximum number of slices supported by the decoder.
Definition: h264dec.h:69
MMCO_END
@ MMCO_END
Definition: h264dec.h:111
write_back_motion_list
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)
Definition: h264dec.h:748
H264Context::mb2br_xy
uint32_t * mb2br_xy
Definition: h264dec.h:407
FMO
#define FMO
Definition: h264dec.h:63
H264SliceContext::last_qscale_diff
int last_qscale_diff
Definition: h264dec.h:197
ff_h264_build_ref_list
int ff_h264_build_ref_list(H264Context *h, H264SliceContext *sl)
Definition: h264_refs.c:299
h264pred.h
left
Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2] ... the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so ...,+,-,+,-,+,+,-,+,-,+,... hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32 - hcoeff[1] - hcoeff[2] - ... a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2} an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||......... intra?||||:Block01 :yes no||||:Block02 :....... ..........||||:Block03 ::y DC ::ref index:||||:Block04 ::cb DC ::motion x :||||......... :cr DC ::motion y :||||....... ..........|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------ ------------ ------------|||Y subbands||Cb subbands||Cr subbands||||--- ---||--- ---||--- ---|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------ ------------ ------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction ------------|\ Dequantization ------------------- \||Reference frames|\ IDWT|------- -------|Motion \|||Frame 0||Frame 1||Compensation . OBMC v -------|------- -------|--------------. \------> Frame n output Frame Frame<----------------------------------/|...|------------------- Range Coder:============Binary Range Coder:------------------- The implemented range coder is an adapted version based upon "Range encoding: an algorithm for removing redundancy from a digitised message." by G. N. N. Martin. The symbols encoded by the Snow range coder are bits(0|1). The associated probabilities are not fix but change depending on the symbol mix seen so far. bit seen|new state ---------+----------------------------------------------- 0|256 - state_transition_table[256 - old_state];1|state_transition_table[old_state];state_transition_table={ 0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:------------------------- FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1. the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled left
Definition: snow.txt:386
H264Context::slice_row
int16_t slice_row[MAX_SLICES]
to detect when MAX_SLICES is too low
Definition: h264dec.h:545
H264SliceContext::pps_id
unsigned int pps_id
Definition: h264dec.h:285
H264SliceContext::linesize
ptrdiff_t linesize
Definition: h264dec.h:233
H264Context::h264chroma
H264ChromaContext h264chroma
Definition: h264dec.h:349
H264SliceContext::slice_beta_offset
int slice_beta_offset
Definition: h264dec.h:202
AVCodecContext
main external API structure.
Definition: avcodec.h:379
ThreadFrame
Definition: thread.h:34
H264SliceContext::bipred_scratchpad
uint8_t * bipred_scratchpad
Definition: h264dec.h:290
H264Picture::field_poc
int field_poc[2]
top/bottom POC
Definition: h264dec.h:148
H264Context::first_field
int first_field
Definition: h264dec.h:415
AV_PICTURE_TYPE_B
@ AV_PICTURE_TYPE_B
Bi-dir predicted.
Definition: avutil.h:276
error_resilience.h
H264Context::zigzag_scan8x8_q0
uint8_t zigzag_scan8x8_q0[64]
Definition: h264dec.h:435
H264Picture::mb_width
int mb_width
Definition: h264dec.h:169
fill_rectangle
static void fill_rectangle(int x, int y, int w, int h)
Definition: ffplay.c:826
H264Picture
Definition: h264dec.h:129
H264ParamSets
Definition: h264_ps.h:143
H264Context::zigzag_scan
uint8_t zigzag_scan[16]
Definition: h264dec.h:428
H264Context::width_from_caller
int width_from_caller
Definition: h264dec.h:549
scan8
static const uint8_t scan8[16 *3+3]
Definition: h264dec.h:651
H264SliceContext::left_cbp
int left_cbp
Definition: h264dec.h:264
ff_h264_decode_init_vlc
void ff_h264_decode_init_vlc(void)
Definition: h264_cavlc.c:326
H264PredWeightTable
Definition: h264_parse.h:30
H264SliceContext::col_parity
int col_parity
Definition: h264dec.h:259
H264Context::slice_table
uint16_t * slice_table
slice_table_base + 2*mb_stride + 1
Definition: h264dec.h:410
VideoDSPContext
Definition: videodsp.h:41
H264Picture::mb_type_buf
AVBufferRef * mb_type_buf
Definition: h264dec.h:139
H264PredContext
Context for storing H.264 prediction functions.
Definition: h264pred.h:92
H264SliceContext::ref_list
H264Ref ref_list[2][48]
0..15: frame refs, 16..47: mbaff field refs.
Definition: h264dec.h:276
H264SliceContext::non_zero_count_cache
uint8_t non_zero_count_cache[15 *8]
non zero coeff count cache.
Definition: h264dec.h:301
H264SliceContext::dist_scale_factor_field
int dist_scale_factor_field[2][32]
Definition: h264dec.h:267
H264SliceContext::direct_cache
uint8_t direct_cache[5 *8]
Definition: h264dec.h:309
H264SliceContext::op
uint8_t op
Definition: h264dec.h:280
H264Context::cur_bit_depth_luma
int cur_bit_depth_luma
Definition: h264dec.h:544
MMCO
Memory management control operation.
Definition: h264dec.h:123
H264Context::scan_padding
uint8_t scan_padding[16]
Definition: h264dec.h:427
H264SliceContext::topright_type
int topright_type
Definition: h264dec.h:222
AVBufferRef
A reference to a data buffer.
Definition: buffer.h:82
H264Context::nal_length_size
int nal_length_size
Number of bytes used for nal length (1, 2 or 4)
Definition: h264dec.h:458
ff_h264_decode_ref_pic_marking
int ff_h264_decode_ref_pic_marking(H264SliceContext *sl, GetBitContext *gb, const H2645NAL *nal, void *logctx)
Definition: h264_refs.c:834
H264SliceContext::left_samples_available
unsigned int left_samples_available
Definition: h264dec.h:231
H264Picture::hwaccel_picture_private
void * hwaccel_picture_private
hardware accelerator private data
Definition: h264dec.h:143
H264SliceContext::neighbor_transform_size
int neighbor_transform_size
number of neighbors (top and/or left) that used 8x8 dct
Definition: h264dec.h:256
H264ChromaContext
Definition: h264chroma.h:27
MMCO_SHORT2UNUSED
@ MMCO_SHORT2UNUSED
Definition: h264dec.h:112
H264SliceContext::gb
GetBitContext gb
Definition: h264dec.h:186
videodsp.h
H264SliceContext::intra4x4_pred_mode
int8_t * intra4x4_pred_mode
Definition: h264dec.h:213
H264Context::short_ref
H264Picture * short_ref[32]
Definition: h264dec.h:470
H264Context::droppable
int droppable
Definition: h264dec.h:369
MB_TYPE_DIRECT2
#define MB_TYPE_DIRECT2
Definition: mpegutils.h:58
H264SliceContext::edge_emu_buffer_allocated
int edge_emu_buffer_allocated
Definition: h264dec.h:294
H264Context::zigzag_scan_q0
uint8_t zigzag_scan_q0[16]
Definition: h264dec.h:434
H264Context::field_scan
uint8_t field_scan[16]
Definition: h264dec.h:431
h
h
Definition: vp9dsp_template.c:2038
H264SliceContext::cabac_init_idc
int cabac_init_idc
Definition: h264dec.h:327
H264_MAX_PICTURE_COUNT
#define H264_MAX_PICTURE_COUNT
Definition: h264dec.h:53
MAX_MMCO_COUNT
#define MAX_MMCO_COUNT
Definition: h264dec.h:55
ff_h264_update_thread_context
int ff_h264_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Definition: h264_slice.c:297
ff_h264_hl_decode_mb
void ff_h264_hl_decode_mb(const H264Context *h, H264SliceContext *sl)
Definition: h264_mb.c:799
write_back_intra_pred_mode
static av_always_inline void write_back_intra_pred_mode(const H264Context *h, H264SliceContext *sl)
Definition: h264dec.h:712
H264SliceContext::bipred_scratchpad_allocated
int bipred_scratchpad_allocated
Definition: h264dec.h:293
write_back_non_zero_count
static av_always_inline void write_back_non_zero_count(const H264Context *h, H264SliceContext *sl)
Definition: h264dec.h:724
H264Context::x264_build
int x264_build
Definition: h264dec.h:375
H264SliceContext::slice_type_fixed
int slice_type_fixed
Definition: h264dec.h:192
H264Ref::poc
int poc
Definition: h264dec.h:178
H264Context::mb2b_xy
uint32_t * mb2b_xy
Definition: h264dec.h:406
H2645Packet
Definition: h2645_parse.h:83
H264Picture::qscale_table_buf
AVBufferRef * qscale_table_buf
Definition: h264dec.h:133
CABACContext
Definition: cabac.h:41
H264SliceContext::delta_poc
int delta_poc[2]
Definition: h264dec.h:336
H264Context::chroma_y_shift
int chroma_y_shift
Definition: h264dec.h:367
H264Context::current_slice
int current_slice
current slice number, used to initialize slice_num of each thread/context
Definition: h264dec.h:495
H264Picture::long_ref
int long_ref
1->long term reference 0->short term reference
Definition: h264dec.h:155
H264Ref::reference
int reference
Definition: h264dec.h:177
H264Picture::motion_val
int16_t(*[2] motion_val)[2]
Definition: h264dec.h:137
H264SliceContext::prev_mb_skipped
int prev_mb_skipped
Definition: h264dec.h:206
ff_h264_filter_mb_fast
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)
Definition: h264_loopfilter.c:419
H264Context::field_scan8x8
uint8_t field_scan8x8[64]
Definition: h264dec.h:432
H264SliceContext::mb_field_decoding_flag
int mb_field_decoding_flag
Definition: h264dec.h:248
H264Context::is_avc
int is_avc
Used to parse AVC variant of H.264.
Definition: h264dec.h:457
min
float min
Definition: vorbis_enc_data.h:429