FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
h264.h
Go to the documentation of this file.
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 / MPEG4 part10 codec.
25  * @author Michael Niedermayer <michaelni@gmx.at>
26  */
27 
28 #ifndef AVCODEC_H264_H
29 #define AVCODEC_H264_H
30 
31 #include "libavutil/intreadwrite.h"
32 #include "cabac.h"
33 #include "error_resilience.h"
34 #include "get_bits.h"
35 #include "h264chroma.h"
36 #include "h264dsp.h"
37 #include "h264pred.h"
38 #include "h264qpel.h"
39 #include "me_cmp.h"
40 #include "mpegutils.h"
41 #include "parser.h"
42 #include "qpeldsp.h"
43 #include "rectangle.h"
44 #include "videodsp.h"
45 
46 #define H264_MAX_PICTURE_COUNT 36
47 #define H264_MAX_THREADS 32
48 
49 #define MAX_SPS_COUNT 32
50 #define MAX_PPS_COUNT 256
51 
52 #define MAX_MMCO_COUNT 66
53 
54 #define MAX_DELAYED_PIC_COUNT 16
55 
56 #define MAX_MBPAIR_SIZE (256*1024) // a tighter bound could be calculated if someone cares about a few bytes
57 
58 /* Compiling in interlaced support reduces the speed
59  * of progressive decoding by about 2%. */
60 #define ALLOW_INTERLACE
61 
62 #define FMO 0
63 
64 /**
65  * The maximum number of slices supported by the decoder.
66  * must be a power of 2
67  */
68 #define MAX_SLICES 16
69 
70 #ifdef ALLOW_INTERLACE
71 #define MB_MBAFF(h) (h)->mb_mbaff
72 #define MB_FIELD(h) (h)->mb_field_decoding_flag
73 #define FRAME_MBAFF(h) (h)->mb_aff_frame
74 #define FIELD_PICTURE(h) ((h)->picture_structure != PICT_FRAME)
75 #define LEFT_MBS 2
76 #define LTOP 0
77 #define LBOT 1
78 #define LEFT(i) (i)
79 #else
80 #define MB_MBAFF(h) 0
81 #define MB_FIELD(h) 0
82 #define FRAME_MBAFF(h) 0
83 #define FIELD_PICTURE(h) 0
84 #undef IS_INTERLACED
85 #define IS_INTERLACED(mb_type) 0
86 #define LEFT_MBS 1
87 #define LTOP 0
88 #define LBOT 0
89 #define LEFT(i) 0
90 #endif
91 #define FIELD_OR_MBAFF_PICTURE(h) (FRAME_MBAFF(h) || FIELD_PICTURE(h))
92 
93 #ifndef CABAC
94 #define CABAC(h) (h)->pps.cabac
95 #endif
96 
97 #define CHROMA(h) ((h)->sps.chroma_format_idc)
98 #define CHROMA422(h) ((h)->sps.chroma_format_idc == 2)
99 #define CHROMA444(h) ((h)->sps.chroma_format_idc == 3)
100 
101 #define EXTENDED_SAR 255
102 
103 #define MB_TYPE_REF0 MB_TYPE_ACPRED // dirty but it fits in 16 bit
104 #define MB_TYPE_8x8DCT 0x01000000
105 #define IS_REF0(a) ((a) & MB_TYPE_REF0)
106 #define IS_8x8DCT(a) ((a) & MB_TYPE_8x8DCT)
107 
108 #define QP_MAX_NUM (51 + 6*6) // The maximum supported qp
109 
110 /* NAL unit types */
111 enum {
112  NAL_SLICE = 1,
113  NAL_DPA = 2,
114  NAL_DPB = 3,
115  NAL_DPC = 4,
116  NAL_IDR_SLICE = 5,
117  NAL_SEI = 6,
118  NAL_SPS = 7,
119  NAL_PPS = 8,
120  NAL_AUD = 9,
121  NAL_END_SEQUENCE = 10,
122  NAL_END_STREAM = 11,
123  NAL_FILLER_DATA = 12,
124  NAL_SPS_EXT = 13,
125  NAL_AUXILIARY_SLICE = 19,
126  NAL_FF_IGNORE = 0xff0f001,
127 };
128 
129 /**
130  * SEI message types
131  */
132 typedef enum {
133  SEI_TYPE_BUFFERING_PERIOD = 0, ///< buffering period (H.264, D.1.1)
134  SEI_TYPE_PIC_TIMING = 1, ///< picture timing
135  SEI_TYPE_USER_DATA_ITU_T_T35 = 4, ///< user data registered by ITU-T Recommendation T.35
136  SEI_TYPE_USER_DATA_UNREGISTERED = 5, ///< unregistered user data
137  SEI_TYPE_RECOVERY_POINT = 6, ///< recovery point (frame # to decoder sync)
138  SEI_TYPE_FRAME_PACKING = 45, ///< frame packing arrangement
139  SEI_TYPE_DISPLAY_ORIENTATION = 47, ///< display orientation
140 } SEI_Type;
141 
142 /**
143  * pic_struct in picture timing SEI message
144  */
145 typedef enum {
146  SEI_PIC_STRUCT_FRAME = 0, ///< 0: %frame
147  SEI_PIC_STRUCT_TOP_FIELD = 1, ///< 1: top field
148  SEI_PIC_STRUCT_BOTTOM_FIELD = 2, ///< 2: bottom field
149  SEI_PIC_STRUCT_TOP_BOTTOM = 3, ///< 3: top field, bottom field, in that order
150  SEI_PIC_STRUCT_BOTTOM_TOP = 4, ///< 4: bottom field, top field, in that order
151  SEI_PIC_STRUCT_TOP_BOTTOM_TOP = 5, ///< 5: top field, bottom field, top field repeated, in that order
152  SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM = 6, ///< 6: bottom field, top field, bottom field repeated, in that order
153  SEI_PIC_STRUCT_FRAME_DOUBLING = 7, ///< 7: %frame doubling
154  SEI_PIC_STRUCT_FRAME_TRIPLING = 8 ///< 8: %frame tripling
155 } SEI_PicStructType;
156 
157 /**
158  * frame_packing_arrangement types
159  */
160 typedef enum {
161  SEI_FPA_TYPE_CHECKERBOARD = 0,
162  SEI_FPA_TYPE_INTERLEAVE_COLUMN = 1,
163  SEI_FPA_TYPE_INTERLEAVE_ROW = 2,
164  SEI_FPA_TYPE_SIDE_BY_SIDE = 3,
165  SEI_FPA_TYPE_TOP_BOTTOM = 4,
166  SEI_FPA_TYPE_INTERLEAVE_TEMPORAL = 5,
167  SEI_FPA_TYPE_2D = 6,
168 } SEI_FpaType;
169 
170 /**
171  * Sequence parameter set
172  */
173 typedef struct SPS {
174  unsigned int sps_id;
175  int profile_idc;
176  int level_idc;
177  int chroma_format_idc;
178  int transform_bypass; ///< qpprime_y_zero_transform_bypass_flag
179  int log2_max_frame_num; ///< log2_max_frame_num_minus4 + 4
180  int poc_type; ///< pic_order_cnt_type
181  int log2_max_poc_lsb; ///< log2_max_pic_order_cnt_lsb_minus4
182  int delta_pic_order_always_zero_flag;
183  int offset_for_non_ref_pic;
184  int offset_for_top_to_bottom_field;
185  int poc_cycle_length; ///< num_ref_frames_in_pic_order_cnt_cycle
186  int ref_frame_count; ///< num_ref_frames
187  int gaps_in_frame_num_allowed_flag;
188  int mb_width; ///< pic_width_in_mbs_minus1 + 1
189  int mb_height; ///< pic_height_in_map_units_minus1 + 1
190  int frame_mbs_only_flag;
191  int mb_aff; ///< mb_adaptive_frame_field_flag
192  int direct_8x8_inference_flag;
193  int crop; ///< frame_cropping_flag
194 
195  /* those 4 are already in luma samples */
196  unsigned int crop_left; ///< frame_cropping_rect_left_offset
197  unsigned int crop_right; ///< frame_cropping_rect_right_offset
198  unsigned int crop_top; ///< frame_cropping_rect_top_offset
199  unsigned int crop_bottom; ///< frame_cropping_rect_bottom_offset
200  int vui_parameters_present_flag;
201  AVRational sar;
202  int video_signal_type_present_flag;
203  int full_range;
204  int colour_description_present_flag;
205  enum AVColorPrimaries color_primaries;
206  enum AVColorTransferCharacteristic color_trc;
207  enum AVColorSpace colorspace;
208  int timing_info_present_flag;
209  uint32_t num_units_in_tick;
210  uint32_t time_scale;
211  int fixed_frame_rate_flag;
212  short offset_for_ref_frame[256]; // FIXME dyn aloc?
213  int bitstream_restriction_flag;
214  int num_reorder_frames;
215  int scaling_matrix_present;
216  uint8_t scaling_matrix4[6][16];
217  uint8_t scaling_matrix8[6][64];
218  int nal_hrd_parameters_present_flag;
219  int vcl_hrd_parameters_present_flag;
220  int pic_struct_present_flag;
221  int time_offset_length;
222  int cpb_cnt; ///< See H.264 E.1.2
223  int initial_cpb_removal_delay_length; ///< initial_cpb_removal_delay_length_minus1 + 1
224  int cpb_removal_delay_length; ///< cpb_removal_delay_length_minus1 + 1
225  int dpb_output_delay_length; ///< dpb_output_delay_length_minus1 + 1
226  int bit_depth_luma; ///< bit_depth_luma_minus8 + 8
227  int bit_depth_chroma; ///< bit_depth_chroma_minus8 + 8
228  int residual_color_transform_flag; ///< residual_colour_transform_flag
229  int constraint_set_flags; ///< constraint_set[0-3]_flag
230  int new; ///< flag to keep track if the decoder context needs re-init due to changed SPS
231 } SPS;
232 
233 /**
234  * Picture parameter set
235  */
236 typedef struct PPS {
237  unsigned int sps_id;
238  int cabac; ///< entropy_coding_mode_flag
239  int pic_order_present; ///< pic_order_present_flag
240  int slice_group_count; ///< num_slice_groups_minus1 + 1
241  int mb_slice_group_map_type;
242  unsigned int ref_count[2]; ///< num_ref_idx_l0/1_active_minus1 + 1
243  int weighted_pred; ///< weighted_pred_flag
244  int weighted_bipred_idc;
245  int init_qp; ///< pic_init_qp_minus26 + 26
246  int init_qs; ///< pic_init_qs_minus26 + 26
247  int chroma_qp_index_offset[2];
248  int deblocking_filter_parameters_present; ///< deblocking_filter_parameters_present_flag
249  int constrained_intra_pred; ///< constrained_intra_pred_flag
250  int redundant_pic_cnt_present; ///< redundant_pic_cnt_present_flag
251  int transform_8x8_mode; ///< transform_8x8_mode_flag
252  uint8_t scaling_matrix4[6][16];
253  uint8_t scaling_matrix8[6][64];
254  uint8_t chroma_qp_table[2][QP_MAX_NUM+1]; ///< pre-scaled (with chroma_qp_index_offset) version of qp_table
255  int chroma_qp_diff;
256 } PPS;
257 
258 /**
259  * Frame Packing Arrangement Type
260  */
261 typedef struct FPA {
262  int frame_packing_arrangement_id;
263  int frame_packing_arrangement_cancel_flag; ///< is previous arrangement canceled, -1 if never received
264  SEI_FpaType frame_packing_arrangement_type;
265  int frame_packing_arrangement_repetition_period;
266  int content_interpretation_type;
267  int quincunx_sampling_flag;
268 } FPA;
269 
270 /**
271  * Memory management control operation opcode.
272  */
273 typedef enum MMCOOpcode {
274  MMCO_END = 0,
275  MMCO_SHORT2UNUSED,
276  MMCO_LONG2UNUSED,
277  MMCO_SHORT2LONG,
278  MMCO_SET_MAX_LONG,
279  MMCO_RESET,
280  MMCO_LONG,
281 } MMCOOpcode;
282 
283 /**
284  * Memory management control operation.
285  */
286 typedef struct MMCO {
287  MMCOOpcode opcode;
288  int short_pic_num; ///< pic_num without wrapping (pic_num & max_pic_num)
289  int long_arg; ///< index, pic_num, or num long refs depending on opcode
290 } MMCO;
291 
292 typedef struct H264Picture {
293  struct AVFrame f;
294  uint8_t avframe_padding[1024]; // hack to allow linking to a avutil with larger AVFrame
295  ThreadFrame tf;
296 
297  AVBufferRef *qscale_table_buf;
298  int8_t *qscale_table;
299 
300  AVBufferRef *motion_val_buf[2];
301  int16_t (*motion_val[2])[2];
302 
303  AVBufferRef *mb_type_buf;
304  uint32_t *mb_type;
305 
306  AVBufferRef *hwaccel_priv_buf;
307  void *hwaccel_picture_private; ///< hardware accelerator private data
308 
309  AVBufferRef *ref_index_buf[2];
310  int8_t *ref_index[2];
311 
312  int field_poc[2]; ///< top/bottom POC
313  int poc; ///< frame POC
314  int frame_num; ///< frame_num (raw frame_num from slice header)
315  int mmco_reset; /**< MMCO_RESET set this 1. Reordering code must
316  not mix pictures before and after MMCO_RESET. */
317  int pic_id; /**< pic_num (short -> no wrap version of pic_num,
318  pic_num & max_pic_num; long -> long_pic_num) */
319  int long_ref; ///< 1->long term reference 0->short term reference
320  int ref_poc[2][2][32]; ///< POCs of the frames/fields used as reference (FIXME need per slice)
321  int ref_count[2][2]; ///< number of entries in ref_poc (FIXME need per slice)
322  int mbaff; ///< 1 -> MBAFF frame 0-> not MBAFF
323  int field_picture; ///< whether or not picture was encoded in separate fields
324 
325  int needs_realloc; ///< picture needs to be reallocated (eg due to a frame size change)
326  int reference;
327  int recovered; ///< picture at IDR or recovery point + recovery count
328  int invalid_gap;
329  int sei_recovery_frame_cnt;
330 
331  int crop;
332  int crop_left;
333  int crop_top;
334 } H264Picture;
335 
336 /**
337  * H264Context
338  */
339 typedef struct H264Context {
340  AVCodecContext *avctx;
341  MECmpContext mecc;
342  VideoDSPContext vdsp;
343  H264DSPContext h264dsp;
344  H264ChromaContext h264chroma;
345  H264QpelContext h264qpel;
346  ParseContext parse_context;
347  GetBitContext gb;
348  ERContext er;
349 
350  H264Picture *DPB;
351  H264Picture *cur_pic_ptr;
352  H264Picture cur_pic;
353 
354  int pixel_shift; ///< 0 for 8-bit H264, 1 for high-bit-depth H264
355  int chroma_qp[2]; // QPc
356 
357  int qp_thresh; ///< QP threshold to skip loopfilter
358 
359  /* coded dimensions -- 16 * mb w/h */
360  int width, height;
361  ptrdiff_t linesize, uvlinesize;
362  int chroma_x_shift, chroma_y_shift;
363 
364  int qscale;
365  int droppable;
366  int data_partitioning;
367  int coded_picture_number;
368  int low_delay;
369 
370  int context_initialized;
371  int flags;
372  int workaround_bugs;
373 
374  int prev_mb_skipped;
375  int next_mb_skipped;
376 
377  // prediction stuff
378  int chroma_pred_mode;
379  int intra16x16_pred_mode;
380 
381  int topleft_mb_xy;
382  int top_mb_xy;
383  int topright_mb_xy;
384  int left_mb_xy[LEFT_MBS];
385 
386  int topleft_type;
387  int top_type;
388  int topright_type;
389  int left_type[LEFT_MBS];
390 
391  const uint8_t *left_block;
392  int topleft_partition;
393 
394  int8_t intra4x4_pred_mode_cache[5 * 8];
395  int8_t(*intra4x4_pred_mode);
396  H264PredContext hpc;
397  unsigned int topleft_samples_available;
398  unsigned int top_samples_available;
399  unsigned int topright_samples_available;
400  unsigned int left_samples_available;
401  uint8_t (*top_borders[2])[(16 * 3) * 2];
402 
403  /**
404  * non zero coeff count cache.
405  * is 64 if not available.
406  */
407  DECLARE_ALIGNED(8, uint8_t, non_zero_count_cache)[15 * 8];
408 
409  uint8_t (*non_zero_count)[48];
410 
411  /**
412  * Motion vector cache.
413  */
414  DECLARE_ALIGNED(16, int16_t, mv_cache)[2][5 * 8][2];
415  DECLARE_ALIGNED(8, int8_t, ref_cache)[2][5 * 8];
416 #define LIST_NOT_USED -1 // FIXME rename?
417 #define PART_NOT_AVAILABLE -2
418 
419  /**
420  * number of neighbors (top and/or left) that used 8x8 dct
421  */
422  int neighbor_transform_size;
423 
424  /**
425  * block_offset[ 0..23] for frame macroblocks
426  * block_offset[24..47] for field macroblocks
427  */
428  int block_offset[2 * (16 * 3)];
429 
430  uint32_t *mb2b_xy; // FIXME are these 4 a good idea?
431  uint32_t *mb2br_xy;
432  int b_stride; // FIXME use s->b4_stride
433 
434  ptrdiff_t mb_linesize; ///< may be equal to s->linesize or s->linesize * 2, for mbaff
435  ptrdiff_t mb_uvlinesize;
436 
437  unsigned current_sps_id; ///< id of the current SPS
438  SPS sps; ///< current sps
439  PPS pps; ///< current pps
440 
441  int au_pps_id; ///< pps_id of current access unit
442 
443  uint32_t dequant4_buffer[6][QP_MAX_NUM + 1][16]; // FIXME should these be moved down?
444  uint32_t dequant8_buffer[6][QP_MAX_NUM + 1][64];
445  uint32_t(*dequant4_coeff[6])[16];
446  uint32_t(*dequant8_coeff[6])[64];
447 
448  int slice_num;
449  uint16_t *slice_table; ///< slice_table_base + 2*mb_stride + 1
450  int slice_type;
451  int slice_type_nos; ///< S free slice type (SI/SP are remapped to I/P)
452  int slice_type_fixed;
453 
454  // interlacing specific flags
455  int mb_aff_frame;
456  int mb_field_decoding_flag;
457  int mb_mbaff; ///< mb_aff_frame && mb_field_decoding_flag
458  int picture_structure;
459  int first_field;
460 
461  DECLARE_ALIGNED(8, uint16_t, sub_mb_type)[4];
462 
463  // Weighted pred stuff
464  int use_weight;
465  int use_weight_chroma;
466  int luma_log2_weight_denom;
467  int chroma_log2_weight_denom;
468  // The following 2 can be changed to int8_t but that causes 10cpu cycles speedloss
469  int luma_weight[48][2][2];
470  int chroma_weight[48][2][2][2];
471  int implicit_weight[48][48][2];
472 
473  int direct_spatial_mv_pred;
474  int col_parity;
475  int col_fieldoff;
476  int dist_scale_factor[32];
477  int dist_scale_factor_field[2][32];
478  int map_col_to_list0[2][16 + 32];
479  int map_col_to_list0_field[2][2][16 + 32];
480 
481  /**
482  * num_ref_idx_l0/1_active_minus1 + 1
483  */
484  unsigned int ref_count[2]; ///< counts frames or fields, depending on current mb mode
485  unsigned int list_count;
486  uint8_t *list_counts; ///< Array of list_count per MB specifying the slice type
487  H264Picture ref_list[2][48]; /**< 0..15: frame refs, 16..47: mbaff field refs.
488  * Reordered version of default_ref_list
489  * according to picture reordering in slice header */
490  int ref2frm[MAX_SLICES][2][64]; ///< reference to frame number lists, used in the loop filter, the first 2 are for -2,-1
491 
492  // data partitioning
493  GetBitContext intra_gb;
494  GetBitContext inter_gb;
495  GetBitContext *intra_gb_ptr;
496  GetBitContext *inter_gb_ptr;
497 
498  const uint8_t *intra_pcm_ptr;
499  DECLARE_ALIGNED(16, int16_t, mb)[16 * 48 * 2]; ///< as a dct coefficient is int32_t in high depth, we need to reserve twice the space.
500  DECLARE_ALIGNED(16, int16_t, mb_luma_dc)[3][16 * 2];
501  int16_t mb_padding[256 * 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
502 
503  /**
504  * Cabac
505  */
506  CABACContext cabac;
507  uint8_t cabac_state[1024];
508 
509  /* 0x100 -> non null luma_dc, 0x80/0x40 -> non null chroma_dc (cb/cr), 0x?0 -> chroma_cbp(0, 1, 2), 0x0? luma_cbp */
510  uint16_t *cbp_table;
511  int cbp;
512  int top_cbp;
513  int left_cbp;
514  /* chroma_pred_mode for i4x4 or i16x16, else 0 */
515  uint8_t *chroma_pred_mode_table;
516  int last_qscale_diff;
517  uint8_t (*mvd_table[2])[2];
518  DECLARE_ALIGNED(16, uint8_t, mvd_cache)[2][5 * 8][2];
519  uint8_t *direct_table;
520  uint8_t direct_cache[5 * 8];
521 
522  uint8_t zigzag_scan[16];
523  uint8_t zigzag_scan8x8[64];
524  uint8_t zigzag_scan8x8_cavlc[64];
525  uint8_t field_scan[16];
526  uint8_t field_scan8x8[64];
527  uint8_t field_scan8x8_cavlc[64];
528  uint8_t zigzag_scan_q0[16];
529  uint8_t zigzag_scan8x8_q0[64];
530  uint8_t zigzag_scan8x8_cavlc_q0[64];
531  uint8_t field_scan_q0[16];
532  uint8_t field_scan8x8_q0[64];
533  uint8_t field_scan8x8_cavlc_q0[64];
534 
535  int x264_build;
536 
537  int mb_x, mb_y;
538  int resync_mb_x;
539  int resync_mb_y;
540  int mb_skip_run;
541  int mb_height, mb_width;
542  int mb_stride;
543  int mb_num;
544  int mb_xy;
545 
546  int is_complex;
547 
548  // deblock
549  int deblocking_filter; ///< disable_deblocking_filter_idc with 1 <-> 0
550  int slice_alpha_c0_offset;
551  int slice_beta_offset;
552 
553  // =============================================================
554  // Things below are not used in the MB or more inner code
555 
556  int nal_ref_idc;
557  int nal_unit_type;
558  uint8_t *rbsp_buffer[2];
559  unsigned int rbsp_buffer_size[2];
560 
561  /**
562  * Used to parse AVC variant of h264
563  */
564  int is_avc; ///< this flag is != 0 if codec is avc1
565  int nal_length_size; ///< Number of bytes used for nal length (1, 2 or 4)
566  int got_first; ///< this flag is != 0 if we've parsed a frame
567 
568  int bit_depth_luma; ///< luma bit depth from sps to detect changes
569  int chroma_format_idc; ///< chroma format from sps to detect changes
570 
571  SPS *sps_buffers[MAX_SPS_COUNT];
572  PPS *pps_buffers[MAX_PPS_COUNT];
573 
574  int dequant_coeff_pps; ///< reinit tables when pps changes
575 
576  uint16_t *slice_table_base;
577 
578  // POC stuff
579  int poc_lsb;
580  int poc_msb;
581  int delta_poc_bottom;
582  int delta_poc[2];
583  int frame_num;
584  int prev_poc_msb; ///< poc_msb of the last reference pic for POC type 0
585  int prev_poc_lsb; ///< poc_lsb of the last reference pic for POC type 0
586  int frame_num_offset; ///< for POC type 2
587  int prev_frame_num_offset; ///< for POC type 2
588  int prev_frame_num; ///< frame_num of the last pic for POC type 1/2
589 
590  /**
591  * frame_num for frames or 2 * frame_num + 1 for field pics.
592  */
593  int curr_pic_num;
594 
595  /**
596  * max_frame_num or 2 * max_frame_num for field pics.
597  */
598  int max_pic_num;
599 
600  int redundant_pic_count;
601 
602  H264Picture default_ref_list[2][32]; ///< base reference list for all slices of a coded picture
603  H264Picture *short_ref[32];
604  H264Picture *long_ref[32];
605  H264Picture *delayed_pic[MAX_DELAYED_PIC_COUNT + 2]; // FIXME size?
606  int last_pocs[MAX_DELAYED_PIC_COUNT];
607  H264Picture *next_output_pic;
608  int outputed_poc;
609  int next_outputed_poc;
610 
611  /**
612  * memory management control operations buffer.
613  */
614  MMCO mmco[MAX_MMCO_COUNT];
615  int mmco_index;
616  int mmco_reset;
617 
618  int long_ref_count; ///< number of actual long term references
619  int short_ref_count; ///< number of actual short term references
620 
621  int cabac_init_idc;
622 
623  /**
624  * @name Members for slice based multithreading
625  * @{
626  */
627  struct H264Context *thread_context[H264_MAX_THREADS];
628 
629  /**
630  * current slice number, used to initialize slice_num of each thread/context
631  */
632  int current_slice;
633 
634  /**
635  * Max number of threads / contexts.
636  * This is equal to AVCodecContext.thread_count unless
637  * multithreaded decoding is impossible, in which case it is
638  * reduced to 1.
639  */
640  int max_contexts;
641 
642  int slice_context_count;
643 
644  /**
645  * 1 if the single thread fallback warning has already been
646  * displayed, 0 otherwise.
647  */
648  int single_decode_warning;
649 
650  enum AVPictureType pict_type;
651 
652  int last_slice_type;
653  unsigned int last_ref_count[2];
654  /** @} */
655 
656  /**
657  * pic_struct in picture timing SEI message
658  */
659  SEI_PicStructType sei_pic_struct;
660 
661  /**
662  * Complement sei_pic_struct
663  * SEI_PIC_STRUCT_TOP_BOTTOM and SEI_PIC_STRUCT_BOTTOM_TOP indicate interlaced frames.
664  * However, soft telecined frames may have these values.
665  * This is used in an attempt to flag soft telecine progressive.
666  */
667  int prev_interlaced_frame;
668 
669  /**
670  * frame_packing_arrangment SEI message
671  */
672  int sei_frame_packing_present;
673  int frame_packing_arrangement_type;
674  int content_interpretation_type;
675  int quincunx_subsampling;
676 
677  /**
678  * display orientation SEI message
679  */
680  int sei_display_orientation_present;
681  int sei_anticlockwise_rotation;
682  int sei_hflip, sei_vflip;
683 
684  /**
685  * Bit set of clock types for fields/frames in picture timing SEI message.
686  * For each found ct_type, appropriate bit is set (e.g., bit 1 for
687  * interlaced).
688  */
689  int sei_ct_type;
690 
691  /**
692  * dpb_output_delay in picture timing SEI message, see H.264 C.2.2
693  */
694  int sei_dpb_output_delay;
695 
696  /**
697  * cpb_removal_delay in picture timing SEI message, see H.264 C.1.2
698  */
699  int sei_cpb_removal_delay;
700 
701  /**
702  * recovery_frame_cnt from SEI message
703  *
704  * Set to -1 if no recovery point SEI message found or to number of frames
705  * before playback synchronizes. Frames having recovery point are key
706  * frames.
707  */
708  int sei_recovery_frame_cnt;
709 
710  /**
711  * Are the SEI recovery points looking valid.
712  */
713  int valid_recovery_point;
714 
715  FPA sei_fpa;
716 
717  /**
718  * recovery_frame is the frame_num at which the next frame should
719  * be fully constructed.
720  *
721  * Set to -1 when not expecting a recovery point.
722  */
723  int recovery_frame;
724 
725 /**
726  * We have seen an IDR, so all the following frames in coded order are correctly
727  * decodable.
728  */
729 #define FRAME_RECOVERED_IDR (1 << 0)
730 /**
731  * Sufficient number of frames have been decoded since a SEI recovery point,
732  * so all the following frames in presentation order are correct.
733  */
734 #define FRAME_RECOVERED_SEI (1 << 1)
735 
736  int frame_recovered; ///< Initial frame has been completely recovered
737 
738  int has_recovery_point;
739 
740  int luma_weight_flag[2]; ///< 7.4.3.2 luma_weight_lX_flag
741  int chroma_weight_flag[2]; ///< 7.4.3.2 chroma_weight_lX_flag
742 
743  // Timestamp stuff
744  int sei_buffering_period_present; ///< Buffering period SEI flag
745  int initial_cpb_removal_delay[32]; ///< Initial timestamps for CPBs
746 
747  int cur_chroma_format_idc;
748  uint8_t *bipred_scratchpad;
749 
750  int16_t slice_row[MAX_SLICES]; ///< to detect when MAX_SLICES is too low
751 
752  uint8_t parse_history[6];
753  int parse_history_count;
754  int parse_last_mb;
755  uint8_t *edge_emu_buffer;
756  int16_t *dc_val_base;
757 
758  AVBufferPool *qscale_table_pool;
759  AVBufferPool *mb_type_pool;
760  AVBufferPool *motion_val_pool;
761  AVBufferPool *ref_index_pool;
762 
763  /* Motion Estimation */
764  qpel_mc_func (*qpel_put)[16];
765  qpel_mc_func (*qpel_avg)[16];
766 } H264Context;
767 
768 extern const uint8_t ff_h264_chroma_qp[7][QP_MAX_NUM + 1]; ///< One chroma qp table for each possible bit depth (8-14).
769 extern const uint16_t ff_h264_mb_sizes[4];
770 
771 /**
772  * Decode SEI
773  */
774 int ff_h264_decode_sei(H264Context *h);
775 
776 /**
777  * Decode SPS
778  */
779 int ff_h264_decode_seq_parameter_set(H264Context *h);
780 
781 /**
782  * compute profile from sps
783  */
784 int ff_h264_get_profile(SPS *sps);
785 
786 /**
787  * Decode PPS
788  */
789 int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length);
790 
791 /**
792  * Decode a network abstraction layer unit.
793  * @param consumed is the number of bytes used as input
794  * @param length is the length of the array
795  * @param dst_length is the number of decoded bytes FIXME here
796  * or a decode rbsp tailing?
797  * @return decoded bytes, might be src+1 if no escapes
798  */
799 const uint8_t *ff_h264_decode_nal(H264Context *h, const uint8_t *src,
800  int *dst_length, int *consumed, int length);
801 
802 /**
803  * Free any data that may have been allocated in the H264 context
804  * like SPS, PPS etc.
805  */
806 void ff_h264_free_context(H264Context *h);
807 
808 /**
809  * Reconstruct bitstream slice_type.
810  */
811 int ff_h264_get_slice_type(const H264Context *h);
812 
813 /**
814  * Allocate tables.
815  * needs width/height
816  */
817 int ff_h264_alloc_tables(H264Context *h);
818 
819 /**
820  * Fill the default_ref_list.
821  */
822 int ff_h264_fill_default_ref_list(H264Context *h);
823 
824 int ff_h264_decode_ref_pic_list_reordering(H264Context *h);
825 void ff_h264_fill_mbaff_ref_list(H264Context *h);
826 void ff_h264_remove_all_refs(H264Context *h);
827 
828 /**
829  * Execute the reference picture marking (memory management control operations).
830  */
831 int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count);
832 
833 int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb,
834  int first_slice);
835 
836 int ff_generate_sliding_window_mmcos(H264Context *h, int first_slice);
837 
838 /**
839  * Check if the top & left blocks are available if needed & change the
840  * dc mode so it only uses the available blocks.
841  */
842 int ff_h264_check_intra4x4_pred_mode(H264Context *h);
843 
844 /**
845  * Check if the top & left blocks are available if needed & change the
846  * dc mode so it only uses the available blocks.
847  */
848 int ff_h264_check_intra_pred_mode(H264Context *h, int mode, int is_chroma);
849 
850 void ff_h264_hl_decode_mb(H264Context *h);
851 int ff_h264_decode_extradata(H264Context *h, const uint8_t *buf, int size);
852 int ff_h264_decode_init(AVCodecContext *avctx);
853 void ff_h264_decode_init_vlc(void);
854 
855 /**
856  * Decode a macroblock
857  * @return 0 if OK, ER_AC_ERROR / ER_DC_ERROR / ER_MV_ERROR on error
858  */
859 int ff_h264_decode_mb_cavlc(H264Context *h);
860 
861 /**
862  * Decode a CABAC coded macroblock
863  * @return 0 if OK, ER_AC_ERROR / ER_DC_ERROR / ER_MV_ERROR on error
864  */
865 int ff_h264_decode_mb_cabac(H264Context *h);
866 
867 void ff_h264_init_cabac_states(H264Context *h);
868 
869 void h264_init_dequant_tables(H264Context *h);
870 
871 void ff_h264_direct_dist_scale_factor(H264Context *const h);
872 void ff_h264_direct_ref_list_init(H264Context *const h);
873 void ff_h264_pred_direct_motion(H264Context *const h, int *mb_type);
874 
875 void ff_h264_filter_mb_fast(H264Context *h, int mb_x, int mb_y,
876  uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr,
877  unsigned int linesize, unsigned int uvlinesize);
878 void ff_h264_filter_mb(H264Context *h, int mb_x, int mb_y,
879  uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr,
880  unsigned int linesize, unsigned int uvlinesize);
881 
882 /**
883  * Reset SEI values at the beginning of the frame.
884  *
885  * @param h H.264 context.
886  */
887 void ff_h264_reset_sei(H264Context *h);
888 
889 /**
890  * Get stereo_mode string from the h264 frame_packing_arrangement
891  * @param h H.264 context.
892  */
893 const char* ff_h264_sei_stereo_mode(H264Context *h);
894 
895 /*
896  * o-o o-o
897  * / / /
898  * o-o o-o
899  * ,---'
900  * o-o o-o
901  * / / /
902  * o-o o-o
903  */
904 
905 /* Scan8 organization:
906  * 0 1 2 3 4 5 6 7
907  * 0 DY y y y y y
908  * 1 y Y Y Y Y
909  * 2 y Y Y Y Y
910  * 3 y Y Y Y Y
911  * 4 y Y Y Y Y
912  * 5 DU u u u u u
913  * 6 u U U U U
914  * 7 u U U U U
915  * 8 u U U U U
916  * 9 u U U U U
917  * 10 DV v v v v v
918  * 11 v V V V V
919  * 12 v V V V V
920  * 13 v V V V V
921  * 14 v V V V V
922  * DY/DU/DV are for luma/chroma DC.
923  */
924 
925 #define LUMA_DC_BLOCK_INDEX 48
926 #define CHROMA_DC_BLOCK_INDEX 49
927 
928 // This table must be here because scan8[constant] must be known at compiletime
929 static const uint8_t scan8[16 * 3 + 3] = {
930  4 + 1 * 8, 5 + 1 * 8, 4 + 2 * 8, 5 + 2 * 8,
931  6 + 1 * 8, 7 + 1 * 8, 6 + 2 * 8, 7 + 2 * 8,
932  4 + 3 * 8, 5 + 3 * 8, 4 + 4 * 8, 5 + 4 * 8,
933  6 + 3 * 8, 7 + 3 * 8, 6 + 4 * 8, 7 + 4 * 8,
934  4 + 6 * 8, 5 + 6 * 8, 4 + 7 * 8, 5 + 7 * 8,
935  6 + 6 * 8, 7 + 6 * 8, 6 + 7 * 8, 7 + 7 * 8,
936  4 + 8 * 8, 5 + 8 * 8, 4 + 9 * 8, 5 + 9 * 8,
937  6 + 8 * 8, 7 + 8 * 8, 6 + 9 * 8, 7 + 9 * 8,
938  4 + 11 * 8, 5 + 11 * 8, 4 + 12 * 8, 5 + 12 * 8,
939  6 + 11 * 8, 7 + 11 * 8, 6 + 12 * 8, 7 + 12 * 8,
940  4 + 13 * 8, 5 + 13 * 8, 4 + 14 * 8, 5 + 14 * 8,
941  6 + 13 * 8, 7 + 13 * 8, 6 + 14 * 8, 7 + 14 * 8,
942  0 + 0 * 8, 0 + 5 * 8, 0 + 10 * 8
943 };
944 
945 static av_always_inline uint32_t pack16to32(int a, int b)
946 {
947 #if HAVE_BIGENDIAN
948  return (b & 0xFFFF) + (a << 16);
949 #else
950  return (a & 0xFFFF) + (b << 16);
951 #endif
952 }
953 
954 static av_always_inline uint16_t pack8to16(int a, int b)
955 {
956 #if HAVE_BIGENDIAN
957  return (b & 0xFF) + (a << 8);
958 #else
959  return (a & 0xFF) + (b << 8);
960 #endif
961 }
962 
963 /**
964  * Get the chroma qp.
965  */
966 static av_always_inline int get_chroma_qp(H264Context *h, int t, int qscale)
967 {
968  return h->pps.chroma_qp_table[t][qscale];
969 }
970 
971 /**
972  * Get the predicted intra4x4 prediction mode.
973  */
974 static av_always_inline int pred_intra_mode(H264Context *h, int n)
975 {
976  const int index8 = scan8[n];
977  const int left = h->intra4x4_pred_mode_cache[index8 - 1];
978  const int top = h->intra4x4_pred_mode_cache[index8 - 8];
979  const int min = FFMIN(left, top);
980 
981  tprintf(h->avctx, "mode:%d %d min:%d\n", left, top, min);
982 
983  if (min < 0)
984  return DC_PRED;
985  else
986  return min;
987 }
988 
989 static av_always_inline void write_back_intra_pred_mode(H264Context *h)
990 {
991  int8_t *i4x4 = h->intra4x4_pred_mode + h->mb2br_xy[h->mb_xy];
992  int8_t *i4x4_cache = h->intra4x4_pred_mode_cache;
993 
994  AV_COPY32(i4x4, i4x4_cache + 4 + 8 * 4);
995  i4x4[4] = i4x4_cache[7 + 8 * 3];
996  i4x4[5] = i4x4_cache[7 + 8 * 2];
997  i4x4[6] = i4x4_cache[7 + 8 * 1];
998 }
999 
1000 static av_always_inline void write_back_non_zero_count(H264Context *h)
1001 {
1002  const int mb_xy = h->mb_xy;
1003  uint8_t *nnz = h->non_zero_count[mb_xy];
1004  uint8_t *nnz_cache = h->non_zero_count_cache;
1005 
1006  AV_COPY32(&nnz[ 0], &nnz_cache[4 + 8 * 1]);
1007  AV_COPY32(&nnz[ 4], &nnz_cache[4 + 8 * 2]);
1008  AV_COPY32(&nnz[ 8], &nnz_cache[4 + 8 * 3]);
1009  AV_COPY32(&nnz[12], &nnz_cache[4 + 8 * 4]);
1010  AV_COPY32(&nnz[16], &nnz_cache[4 + 8 * 6]);
1011  AV_COPY32(&nnz[20], &nnz_cache[4 + 8 * 7]);
1012  AV_COPY32(&nnz[32], &nnz_cache[4 + 8 * 11]);
1013  AV_COPY32(&nnz[36], &nnz_cache[4 + 8 * 12]);
1014 
1015  if (!h->chroma_y_shift) {
1016  AV_COPY32(&nnz[24], &nnz_cache[4 + 8 * 8]);
1017  AV_COPY32(&nnz[28], &nnz_cache[4 + 8 * 9]);
1018  AV_COPY32(&nnz[40], &nnz_cache[4 + 8 * 13]);
1019  AV_COPY32(&nnz[44], &nnz_cache[4 + 8 * 14]);
1020  }
1021 }
1022 
1023 static av_always_inline void write_back_motion_list(H264Context *h,
1024  int b_stride,
1025  int b_xy, int b8_xy,
1026  int mb_type, int list)
1027 {
1028  int16_t(*mv_dst)[2] = &h->cur_pic.motion_val[list][b_xy];
1029  int16_t(*mv_src)[2] = &h->mv_cache[list][scan8[0]];
1030  AV_COPY128(mv_dst + 0 * b_stride, mv_src + 8 * 0);
1031  AV_COPY128(mv_dst + 1 * b_stride, mv_src + 8 * 1);
1032  AV_COPY128(mv_dst + 2 * b_stride, mv_src + 8 * 2);
1033  AV_COPY128(mv_dst + 3 * b_stride, mv_src + 8 * 3);
1034  if (CABAC(h)) {
1035  uint8_t (*mvd_dst)[2] = &h->mvd_table[list][FMO ? 8 * h->mb_xy
1036  : h->mb2br_xy[h->mb_xy]];
1037  uint8_t(*mvd_src)[2] = &h->mvd_cache[list][scan8[0]];
1038  if (IS_SKIP(mb_type)) {
1039  AV_ZERO128(mvd_dst);
1040  } else {
1041  AV_COPY64(mvd_dst, mvd_src + 8 * 3);
1042  AV_COPY16(mvd_dst + 3 + 3, mvd_src + 3 + 8 * 0);
1043  AV_COPY16(mvd_dst + 3 + 2, mvd_src + 3 + 8 * 1);
1044  AV_COPY16(mvd_dst + 3 + 1, mvd_src + 3 + 8 * 2);
1045  }
1046  }
1047 
1048  {
1049  int8_t *ref_index = &h->cur_pic.ref_index[list][b8_xy];
1050  int8_t *ref_cache = h->ref_cache[list];
1051  ref_index[0 + 0 * 2] = ref_cache[scan8[0]];
1052  ref_index[1 + 0 * 2] = ref_cache[scan8[4]];
1053  ref_index[0 + 1 * 2] = ref_cache[scan8[8]];
1054  ref_index[1 + 1 * 2] = ref_cache[scan8[12]];
1055  }
1056 }
1057 
1058 static av_always_inline void write_back_motion(H264Context *h, int mb_type)
1059 {
1060  const int b_stride = h->b_stride;
1061  const int b_xy = 4 * h->mb_x + 4 * h->mb_y * h->b_stride; // try mb2b(8)_xy
1062  const int b8_xy = 4 * h->mb_xy;
1063 
1064  if (USES_LIST(mb_type, 0)) {
1065  write_back_motion_list(h, b_stride, b_xy, b8_xy, mb_type, 0);
1066  } else {
1067  fill_rectangle(&h->cur_pic.ref_index[0][b8_xy],
1068  2, 2, 2, (uint8_t)LIST_NOT_USED, 1);
1069  }
1070  if (USES_LIST(mb_type, 1))
1071  write_back_motion_list(h, b_stride, b_xy, b8_xy, mb_type, 1);
1072 
1073  if (h->slice_type_nos == AV_PICTURE_TYPE_B && CABAC(h)) {
1074  if (IS_8X8(mb_type)) {
1075  uint8_t *direct_table = &h->direct_table[4 * h->mb_xy];
1076  direct_table[1] = h->sub_mb_type[1] >> 1;
1077  direct_table[2] = h->sub_mb_type[2] >> 1;
1078  direct_table[3] = h->sub_mb_type[3] >> 1;
1079  }
1080  }
1081 }
1082 
1083 static av_always_inline int get_dct8x8_allowed(H264Context *h)
1084 {
1085  if (h->sps.direct_8x8_inference_flag)
1086  return !(AV_RN64A(h->sub_mb_type) &
1087  ((MB_TYPE_16x8 | MB_TYPE_8x16 | MB_TYPE_8x8) *
1088  0x0001000100010001ULL));
1089  else
1090  return !(AV_RN64A(h->sub_mb_type) &
1091  ((MB_TYPE_16x8 | MB_TYPE_8x16 | MB_TYPE_8x8 | MB_TYPE_DIRECT2) *
1092  0x0001000100010001ULL));
1093 }
1094 
1095 int ff_h264_field_end(H264Context *h, int in_setup);
1096 
1097 int ff_h264_ref_picture(H264Context *h, H264Picture *dst, H264Picture *src);
1098 void ff_h264_unref_picture(H264Context *h, H264Picture *pic);
1099 
1100 int ff_h264_context_init(H264Context *h);
1101 int ff_h264_set_parameter_from_sps(H264Context *h);
1102 
1103 void ff_h264_draw_horiz_band(H264Context *h, int y, int height);
1104 int ff_init_poc(H264Context *h, int pic_field_poc[2], int *pic_poc);
1105 int ff_pred_weight_table(H264Context *h);
1106 int ff_set_ref_count(H264Context *h);
1107 
1108 int ff_h264_decode_slice_header(H264Context *h, H264Context *h0);
1109 #define SLICE_SINGLETHREAD 1
1110 #define SLICE_SKIPED 2
1111 
1112 int ff_h264_execute_decode_slices(H264Context *h, unsigned context_count);
1113 int ff_h264_update_thread_context(AVCodecContext *dst,
1114  const AVCodecContext *src);
1115 
1116 void ff_h264_flush_change(H264Context *h);
1117 
1118 void ff_h264_free_tables(H264Context *h, int free_rbsp);
1119 
1120 void ff_h264_set_erpic(ERPicture *dst, H264Picture *src);
1121 
1122 #endif /* AVCODEC_H264_H */
Generated on Sun Sep 14 2014 18:55:56 for FFmpeg by   doxygen 1.8.2