2 * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
3 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
5 * This file is part of FFmpeg.
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.
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.
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
24 * H.264 / AVC / MPEG-4 part10 codec.
25 * @author Michael Niedermayer <michaelni@gmx.at>
28 #ifndef AVCODEC_H264DEC_H
29 #define AVCODEC_H264DEC_H
31 #include "libavutil/buffer.h"
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/thread.h"
36 #include "error_resilience.h"
37 #include "h264_parse.h"
40 #include "h2645_parse.h"
41 #include "h264chroma.h"
46 #include "mpegutils.h"
49 #include "rectangle.h"
52 #define H264_MAX_PICTURE_COUNT 36
54 #define MAX_MMCO_COUNT 66
56 #define MAX_DELAYED_PIC_COUNT 16
58 #define MAX_MBPAIR_SIZE (256*1024) // a tighter bound could be calculated if someone cares about a few bytes
60 /* Compiling in interlaced support reduces the speed
61 * of progressive decoding by about 2%. */
62 #define ALLOW_INTERLACE
67 * The maximum number of slices supported by the decoder.
68 * must be a power of 2
72 #ifdef ALLOW_INTERLACE
73 #define MB_MBAFF(h) (h)->mb_mbaff
74 #define MB_FIELD(sl) (sl)->mb_field_decoding_flag
75 #define FRAME_MBAFF(h) (h)->mb_aff_frame
76 #define FIELD_PICTURE(h) ((h)->picture_structure != PICT_FRAME)
83 #define MB_FIELD(sl) 0
84 #define FRAME_MBAFF(h) 0
85 #define FIELD_PICTURE(h) 0
87 #define IS_INTERLACED(mb_type) 0
93 #define FIELD_OR_MBAFF_PICTURE(h) (FRAME_MBAFF(h) || FIELD_PICTURE(h))
96 #define CABAC(h) (h)->ps.pps->cabac
99 #define CHROMA(h) ((h)->ps.sps->chroma_format_idc)
100 #define CHROMA422(h) ((h)->ps.sps->chroma_format_idc == 2)
101 #define CHROMA444(h) ((h)->ps.sps->chroma_format_idc == 3)
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)
109 * Memory management control operation opcode.
111 typedef enum MMCOOpcode {
122 * Memory management control operation.
124 typedef struct MMCO {
126 int short_pic_num; ///< pic_num without wrapping (pic_num & max_pic_num)
127 int long_arg; ///< index, pic_num, or num long refs depending on opcode
130 typedef struct H264Picture {
134 AVBufferRef *qscale_table_buf;
135 int8_t *qscale_table;
137 AVBufferRef *motion_val_buf[2];
138 int16_t (*motion_val[2])[2];
140 AVBufferRef *mb_type_buf;
143 AVBufferRef *hwaccel_priv_buf;
144 void *hwaccel_picture_private; ///< hardware accelerator private data
146 AVBufferRef *ref_index_buf[2];
147 int8_t *ref_index[2];
149 int field_poc[2]; ///< top/bottom POC
150 int poc; ///< frame POC
151 int frame_num; ///< frame_num (raw frame_num from slice header)
152 int mmco_reset; /**< MMCO_RESET set this 1. Reordering code must
153 not mix pictures before and after MMCO_RESET. */
154 int pic_id; /**< pic_num (short -> no wrap version of pic_num,
155 pic_num & max_pic_num; long -> long_pic_num) */
156 int long_ref; ///< 1->long term reference 0->short term reference
157 int ref_poc[2][2][32]; ///< POCs of the frames/fields used as reference (FIXME need per slice)
158 int ref_count[2][2]; ///< number of entries in ref_poc (FIXME need per slice)
159 int mbaff; ///< 1 -> MBAFF frame 0-> not MBAFF
160 int field_picture; ///< whether or not picture was encoded in separate fields
163 int recovered; ///< picture at IDR or recovery point + recovery count
165 int sei_recovery_frame_cnt;
172 typedef struct H264Ref {
183 typedef struct H264SliceContext {
184 struct H264Context *h264;
190 int slice_type_nos; ///< S free slice type (SI/SP are remapped to I/P)
191 int slice_type_fixed;
194 int chroma_qp[2]; // QPc
195 int qp_thresh; ///< QP threshold to skip loopfilter
196 int last_qscale_diff;
199 int deblocking_filter; ///< disable_deblocking_filter_idc with 1 <-> 0
200 int slice_alpha_c0_offset;
201 int slice_beta_offset;
203 H264PredWeightTable pwt;
208 int chroma_pred_mode;
209 int intra16x16_pred_mode;
211 int8_t intra4x4_pred_mode_cache[5 * 8];
212 int8_t(*intra4x4_pred_mode);
217 int left_mb_xy[LEFT_MBS];
222 int left_type[LEFT_MBS];
224 const uint8_t *left_block;
225 int topleft_partition;
227 unsigned int topleft_samples_available;
228 unsigned int top_samples_available;
229 unsigned int topright_samples_available;
230 unsigned int left_samples_available;
232 ptrdiff_t linesize, uvlinesize;
233 ptrdiff_t mb_linesize; ///< may be equal to s->linesize or s->linesize * 2, for mbaff
234 ptrdiff_t mb_uvlinesize;
240 unsigned int first_mb_addr;
241 // index of the first MB of the next slice
246 int picture_structure;
247 int mb_field_decoding_flag;
248 int mb_mbaff; ///< mb_aff_frame && mb_field_decoding_flag
250 int redundant_pic_count;
253 * number of neighbors (top and/or left) that used 8x8 dct
255 int neighbor_transform_size;
257 int direct_spatial_mv_pred;
265 int dist_scale_factor[32];
266 int dist_scale_factor_field[2][32];
267 int map_col_to_list0[2][16 + 32];
268 int map_col_to_list0_field[2][2][16 + 32];
271 * num_ref_idx_l0/1_active_minus1 + 1
273 unsigned int ref_count[2]; ///< counts frames or fields, depending on current mb mode
274 unsigned int list_count;
275 H264Ref ref_list[2][48]; /**< 0..15: frame refs, 16..47: mbaff field refs.
276 * Reordered version of default_ref_list
277 * according to picture reordering in slice header */
281 } ref_modifications[2][32];
282 int nb_ref_modifications[2];
286 const uint8_t *intra_pcm_ptr;
287 int16_t *dc_val_base;
289 uint8_t *bipred_scratchpad;
290 uint8_t *edge_emu_buffer;
291 uint8_t (*top_borders[2])[(16 * 3) * 2];
292 int bipred_scratchpad_allocated;
293 int edge_emu_buffer_allocated;
294 int top_borders_allocated[2];
297 * non zero coeff count cache.
298 * is 64 if not available.
300 DECLARE_ALIGNED(8, uint8_t, non_zero_count_cache)[15 * 8];
303 * Motion vector cache.
305 DECLARE_ALIGNED(16, int16_t, mv_cache)[2][5 * 8][2];
306 DECLARE_ALIGNED(8, int8_t, ref_cache)[2][5 * 8];
307 DECLARE_ALIGNED(16, uint8_t, mvd_cache)[2][5 * 8][2];
308 uint8_t direct_cache[5 * 8];
310 DECLARE_ALIGNED(8, uint16_t, sub_mb_type)[4];
312 ///< as a DCT coefficient is int32_t in high depth, we need to reserve twice the space.
313 DECLARE_ALIGNED(16, int16_t, mb)[16 * 48 * 2];
314 DECLARE_ALIGNED(16, int16_t, mb_luma_dc)[3][16 * 2];
315 ///< as mb is addressed by scantable[i] and scantable is uint8_t we can either
316 ///< check that i is not too large or ensure that there is some unused stuff after mb
317 int16_t mb_padding[256 * 2];
319 uint8_t (*mvd_table[2])[2];
325 uint8_t cabac_state[1024];
328 MMCO mmco[MAX_MMCO_COUNT];
330 int explicit_ref_marking;
334 int delta_poc_bottom;
343 typedef struct H264Context {
344 const AVClass *class;
345 AVCodecContext *avctx;
346 VideoDSPContext vdsp;
347 H264DSPContext h264dsp;
348 H264ChromaContext h264chroma;
349 H264QpelContext h264qpel;
351 H264Picture DPB[H264_MAX_PICTURE_COUNT];
352 H264Picture *cur_pic_ptr;
354 H264Picture last_pic_for_ec;
356 H264SliceContext *slice_ctx;
361 int pixel_shift; ///< 0 for 8-bit H.264, 1 for high-bit-depth H.264
363 /* coded dimensions -- 16 * mb w/h */
365 int chroma_x_shift, chroma_y_shift;
368 * Backup frame properties: needed, because they can be different
369 * between returned frame and last decoded frame.
373 enum AVPixelFormat backup_pix_fmt;
376 int coded_picture_number;
378 int context_initialized;
381 /* Set when slice threading is used and at least one slice uses deblocking
382 * mode 1 (i.e. across slice boundaries). Then we disable the loop filter
383 * during normal MB decoding and execute it serially at the end.
387 int8_t(*intra4x4_pred_mode);
390 uint8_t (*non_zero_count)[48];
392 #define LIST_NOT_USED -1 // FIXME rename?
393 #define PART_NOT_AVAILABLE -2
396 * block_offset[ 0..23] for frame macroblocks
397 * block_offset[24..47] for field macroblocks
399 int block_offset[2 * (16 * 3)];
401 uint32_t *mb2b_xy; // FIXME are these 4 a good idea?
403 int b_stride; // FIXME use s->b4_stride
405 uint16_t *slice_table; ///< slice_table_base + 2*mb_stride + 1
407 // interlacing specific flags
409 int picture_structure;
412 uint8_t *list_counts; ///< Array of list_count per MB specifying the slice type
414 /* 0x100 -> non null luma_dc, 0x80/0x40 -> non null chroma_dc (cb/cr), 0x?0 -> chroma_cbp(0, 1, 2), 0x0? luma_cbp */
417 /* chroma_pred_mode for i4x4 or i16x16, else 0 */
418 uint8_t *chroma_pred_mode_table;
419 uint8_t (*mvd_table[2])[2];
420 uint8_t *direct_table;
422 uint8_t zigzag_scan[16];
423 uint8_t zigzag_scan8x8[64];
424 uint8_t zigzag_scan8x8_cavlc[64];
425 uint8_t field_scan[16];
426 uint8_t field_scan8x8[64];
427 uint8_t field_scan8x8_cavlc[64];
428 uint8_t zigzag_scan_q0[16];
429 uint8_t zigzag_scan8x8_q0[64];
430 uint8_t zigzag_scan8x8_cavlc_q0[64];
431 uint8_t field_scan_q0[16];
432 uint8_t field_scan8x8_q0[64];
433 uint8_t field_scan8x8_cavlc_q0[64];
436 int mb_height, mb_width;
440 // =============================================================
441 // Things below are not used in the MB or more inner code
447 * Used to parse AVC variant of H.264
449 int is_avc; ///< this flag is != 0 if codec is avc1
450 int nal_length_size; ///< Number of bytes used for nal length (1, 2 or 4)
452 int bit_depth_luma; ///< luma bit depth from sps to detect changes
453 int chroma_format_idc; ///< chroma format from sps to detect changes
457 uint16_t *slice_table_base;
461 H264Ref default_ref[2];
462 H264Picture *short_ref[32];
463 H264Picture *long_ref[32];
464 H264Picture *delayed_pic[MAX_DELAYED_PIC_COUNT + 2]; // FIXME size?
465 int last_pocs[MAX_DELAYED_PIC_COUNT];
466 H264Picture *next_output_pic;
467 int next_outputed_poc;
470 * memory management control operations buffer.
472 MMCO mmco[MAX_MMCO_COUNT];
475 int explicit_ref_marking;
477 int long_ref_count; ///< number of actual long term references
478 int short_ref_count; ///< number of actual short term references
481 * @name Members for slice based multithreading
485 * current slice number, used to initialize slice_num of each thread/context
490 * Max number of threads / contexts.
491 * This is equal to AVCodecContext.thread_count unless
492 * multithreaded decoding is impossible, in which case it is
498 * 1 if the single thread fallback warning has already been
499 * displayed, 0 otherwise.
501 int single_decode_warning;
506 * Complement sei_pic_struct
507 * SEI_PIC_STRUCT_TOP_BOTTOM and SEI_PIC_STRUCT_BOTTOM_TOP indicate interlaced frames.
508 * However, soft telecined frames may have these values.
509 * This is used in an attempt to flag soft telecine progressive.
511 int prev_interlaced_frame;
514 * Are the SEI recovery points looking valid.
516 int valid_recovery_point;
519 * recovery_frame is the frame_num at which the next frame should
520 * be fully constructed.
522 * Set to -1 when not expecting a recovery point.
527 * We have seen an IDR, so all the following frames in coded order are correctly
530 #define FRAME_RECOVERED_IDR (1 << 0)
532 * Sufficient number of frames have been decoded since a SEI recovery point,
533 * so all the following frames in presentation order are correct.
535 #define FRAME_RECOVERED_SEI (1 << 1)
537 int frame_recovered; ///< Initial frame has been completely recovered
539 int has_recovery_point;
543 /* for frame threading, this is set to 1
544 * after finish_setup() has been called, so we cannot modify
545 * some context properties (which are supposed to stay constant between
549 int cur_chroma_format_idc;
550 int cur_bit_depth_luma;
551 int16_t slice_row[MAX_SLICES]; ///< to detect when MAX_SLICES is too low
557 AVBufferPool *qscale_table_pool;
558 AVBufferPool *mb_type_pool;
559 AVBufferPool *motion_val_pool;
560 AVBufferPool *ref_index_pool;
561 int ref2frm[MAX_SLICES][2][64]; ///< reference to frame number lists, used in the loop filter, the first 2 are for -2,-1
564 extern const uint16_t ff_h264_mb_sizes[4];
567 * Reconstruct bitstream slice_type.
569 int ff_h264_get_slice_type(const H264SliceContext *sl);
575 int ff_h264_alloc_tables(H264Context *h);
577 int ff_h264_decode_ref_pic_list_reordering(const H264Context *h, H264SliceContext *sl);
578 int ff_h264_build_ref_list(H264Context *h, H264SliceContext *sl);
579 void ff_h264_remove_all_refs(H264Context *h);
582 * Execute the reference picture marking (memory management control operations).
584 int ff_h264_execute_ref_pic_marking(H264Context *h);
586 int ff_h264_decode_ref_pic_marking(const H264Context *h, H264SliceContext *sl,
589 void ff_h264_hl_decode_mb(const H264Context *h, H264SliceContext *sl);
590 int ff_h264_decode_init(AVCodecContext *avctx);
591 void ff_h264_decode_init_vlc(void);
594 * Decode a macroblock
595 * @return 0 if OK, ER_AC_ERROR / ER_DC_ERROR / ER_MV_ERROR on error
597 int ff_h264_decode_mb_cavlc(const H264Context *h, H264SliceContext *sl);
600 * Decode a CABAC coded macroblock
601 * @return 0 if OK, ER_AC_ERROR / ER_DC_ERROR / ER_MV_ERROR on error
603 int ff_h264_decode_mb_cabac(const H264Context *h, H264SliceContext *sl);
605 void ff_h264_init_cabac_states(const H264Context *h, H264SliceContext *sl);
607 void ff_h264_direct_dist_scale_factor(const H264Context *const h, H264SliceContext *sl);
608 void ff_h264_direct_ref_list_init(const H264Context *const h, H264SliceContext *sl);
609 void ff_h264_pred_direct_motion(const H264Context *const h, H264SliceContext *sl,
612 void ff_h264_filter_mb_fast(const H264Context *h, H264SliceContext *sl, int mb_x, int mb_y,
613 uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr,
614 unsigned int linesize, unsigned int uvlinesize);
615 void ff_h264_filter_mb(const H264Context *h, H264SliceContext *sl, int mb_x, int mb_y,
616 uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr,
617 unsigned int linesize, unsigned int uvlinesize);
629 /* Scan8 organization:
646 * DY/DU/DV are for luma/chroma DC.
649 #define LUMA_DC_BLOCK_INDEX 48
650 #define CHROMA_DC_BLOCK_INDEX 49
652 // This table must be here because scan8[constant] must be known at compiletime
653 static const uint8_t scan8[16 * 3 + 3] = {
654 4 + 1 * 8, 5 + 1 * 8, 4 + 2 * 8, 5 + 2 * 8,
655 6 + 1 * 8, 7 + 1 * 8, 6 + 2 * 8, 7 + 2 * 8,
656 4 + 3 * 8, 5 + 3 * 8, 4 + 4 * 8, 5 + 4 * 8,
657 6 + 3 * 8, 7 + 3 * 8, 6 + 4 * 8, 7 + 4 * 8,
658 4 + 6 * 8, 5 + 6 * 8, 4 + 7 * 8, 5 + 7 * 8,
659 6 + 6 * 8, 7 + 6 * 8, 6 + 7 * 8, 7 + 7 * 8,
660 4 + 8 * 8, 5 + 8 * 8, 4 + 9 * 8, 5 + 9 * 8,
661 6 + 8 * 8, 7 + 8 * 8, 6 + 9 * 8, 7 + 9 * 8,
662 4 + 11 * 8, 5 + 11 * 8, 4 + 12 * 8, 5 + 12 * 8,
663 6 + 11 * 8, 7 + 11 * 8, 6 + 12 * 8, 7 + 12 * 8,
664 4 + 13 * 8, 5 + 13 * 8, 4 + 14 * 8, 5 + 14 * 8,
665 6 + 13 * 8, 7 + 13 * 8, 6 + 14 * 8, 7 + 14 * 8,
666 0 + 0 * 8, 0 + 5 * 8, 0 + 10 * 8
669 static av_always_inline uint32_t pack16to32(unsigned a, unsigned b)
672 return (b & 0xFFFF) + (a << 16);
674 return (a & 0xFFFF) + (b << 16);
678 static av_always_inline uint16_t pack8to16(unsigned a, unsigned b)
681 return (b & 0xFF) + (a << 8);
683 return (a & 0xFF) + (b << 8);
690 static av_always_inline int get_chroma_qp(const PPS *pps, int t, int qscale)
692 return pps->chroma_qp_table[t][qscale];
696 * Get the predicted intra4x4 prediction mode.
698 static av_always_inline int pred_intra_mode(const H264Context *h,
699 H264SliceContext *sl, int n)
701 const int index8 = scan8[n];
702 const int left = sl->intra4x4_pred_mode_cache[index8 - 1];
703 const int top = sl->intra4x4_pred_mode_cache[index8 - 8];
704 const int min = FFMIN(left, top);
706 ff_tlog(h->avctx, "mode:%d %d min:%d\n", left, top, min);
714 static av_always_inline void write_back_intra_pred_mode(const H264Context *h,
715 H264SliceContext *sl)
717 int8_t *i4x4 = sl->intra4x4_pred_mode + h->mb2br_xy[sl->mb_xy];
718 int8_t *i4x4_cache = sl->intra4x4_pred_mode_cache;
720 AV_COPY32(i4x4, i4x4_cache + 4 + 8 * 4);
721 i4x4[4] = i4x4_cache[7 + 8 * 3];
722 i4x4[5] = i4x4_cache[7 + 8 * 2];
723 i4x4[6] = i4x4_cache[7 + 8 * 1];
726 static av_always_inline void write_back_non_zero_count(const H264Context *h,
727 H264SliceContext *sl)
729 const int mb_xy = sl->mb_xy;
730 uint8_t *nnz = h->non_zero_count[mb_xy];
731 uint8_t *nnz_cache = sl->non_zero_count_cache;
733 AV_COPY32(&nnz[ 0], &nnz_cache[4 + 8 * 1]);
734 AV_COPY32(&nnz[ 4], &nnz_cache[4 + 8 * 2]);
735 AV_COPY32(&nnz[ 8], &nnz_cache[4 + 8 * 3]);
736 AV_COPY32(&nnz[12], &nnz_cache[4 + 8 * 4]);
737 AV_COPY32(&nnz[16], &nnz_cache[4 + 8 * 6]);
738 AV_COPY32(&nnz[20], &nnz_cache[4 + 8 * 7]);
739 AV_COPY32(&nnz[32], &nnz_cache[4 + 8 * 11]);
740 AV_COPY32(&nnz[36], &nnz_cache[4 + 8 * 12]);
742 if (!h->chroma_y_shift) {
743 AV_COPY32(&nnz[24], &nnz_cache[4 + 8 * 8]);
744 AV_COPY32(&nnz[28], &nnz_cache[4 + 8 * 9]);
745 AV_COPY32(&nnz[40], &nnz_cache[4 + 8 * 13]);
746 AV_COPY32(&nnz[44], &nnz_cache[4 + 8 * 14]);
750 static av_always_inline void write_back_motion_list(const H264Context *h,
751 H264SliceContext *sl,
754 int mb_type, int list)
756 int16_t(*mv_dst)[2] = &h->cur_pic.motion_val[list][b_xy];
757 int16_t(*mv_src)[2] = &sl->mv_cache[list][scan8[0]];
758 AV_COPY128(mv_dst + 0 * b_stride, mv_src + 8 * 0);
759 AV_COPY128(mv_dst + 1 * b_stride, mv_src + 8 * 1);
760 AV_COPY128(mv_dst + 2 * b_stride, mv_src + 8 * 2);
761 AV_COPY128(mv_dst + 3 * b_stride, mv_src + 8 * 3);
763 uint8_t (*mvd_dst)[2] = &sl->mvd_table[list][FMO ? 8 * sl->mb_xy
764 : h->mb2br_xy[sl->mb_xy]];
765 uint8_t(*mvd_src)[2] = &sl->mvd_cache[list][scan8[0]];
766 if (IS_SKIP(mb_type)) {
769 AV_COPY64(mvd_dst, mvd_src + 8 * 3);
770 AV_COPY16(mvd_dst + 3 + 3, mvd_src + 3 + 8 * 0);
771 AV_COPY16(mvd_dst + 3 + 2, mvd_src + 3 + 8 * 1);
772 AV_COPY16(mvd_dst + 3 + 1, mvd_src + 3 + 8 * 2);
777 int8_t *ref_index = &h->cur_pic.ref_index[list][b8_xy];
778 int8_t *ref_cache = sl->ref_cache[list];
779 ref_index[0 + 0 * 2] = ref_cache[scan8[0]];
780 ref_index[1 + 0 * 2] = ref_cache[scan8[4]];
781 ref_index[0 + 1 * 2] = ref_cache[scan8[8]];
782 ref_index[1 + 1 * 2] = ref_cache[scan8[12]];
786 static av_always_inline void write_back_motion(const H264Context *h,
787 H264SliceContext *sl,
790 const int b_stride = h->b_stride;
791 const int b_xy = 4 * sl->mb_x + 4 * sl->mb_y * h->b_stride; // try mb2b(8)_xy
792 const int b8_xy = 4 * sl->mb_xy;
794 if (USES_LIST(mb_type, 0)) {
795 write_back_motion_list(h, sl, b_stride, b_xy, b8_xy, mb_type, 0);
797 fill_rectangle(&h->cur_pic.ref_index[0][b8_xy],
798 2, 2, 2, (uint8_t)LIST_NOT_USED, 1);
800 if (USES_LIST(mb_type, 1))
801 write_back_motion_list(h, sl, b_stride, b_xy, b8_xy, mb_type, 1);
803 if (sl->slice_type_nos == AV_PICTURE_TYPE_B && CABAC(h)) {
804 if (IS_8X8(mb_type)) {
805 uint8_t *direct_table = &h->direct_table[4 * sl->mb_xy];
806 direct_table[1] = sl->sub_mb_type[1] >> 1;
807 direct_table[2] = sl->sub_mb_type[2] >> 1;
808 direct_table[3] = sl->sub_mb_type[3] >> 1;
813 static av_always_inline int get_dct8x8_allowed(const H264Context *h, H264SliceContext *sl)
815 if (h->ps.sps->direct_8x8_inference_flag)
816 return !(AV_RN64A(sl->sub_mb_type) &
817 ((MB_TYPE_16x8 | MB_TYPE_8x16 | MB_TYPE_8x8) *
818 0x0001000100010001ULL));
820 return !(AV_RN64A(sl->sub_mb_type) &
821 ((MB_TYPE_16x8 | MB_TYPE_8x16 | MB_TYPE_8x8 | MB_TYPE_DIRECT2) *
822 0x0001000100010001ULL));
825 static inline int find_start_code(const uint8_t *buf, int buf_size,
826 int buf_index, int next_avc)
830 buf_index = avpriv_find_start_code(buf + buf_index, buf + next_avc + 1, &state) - buf - 1;
832 return FFMIN(buf_index, buf_size);
835 int ff_h264_field_end(H264Context *h, H264SliceContext *sl, int in_setup);
837 int ff_h264_ref_picture(H264Context *h, H264Picture *dst, H264Picture *src);
838 void ff_h264_unref_picture(H264Context *h, H264Picture *pic);
840 int ff_h264_slice_context_init(H264Context *h, H264SliceContext *sl);
842 void ff_h264_draw_horiz_band(const H264Context *h, H264SliceContext *sl, int y, int height);
844 int ff_h264_decode_slice_header(H264Context *h, H264SliceContext *sl,
845 const H2645NAL *nal);
846 #define SLICE_SINGLETHREAD 1
847 #define SLICE_SKIPED 2
849 int ff_h264_execute_decode_slices(H264Context *h, unsigned context_count);
850 int ff_h264_update_thread_context(AVCodecContext *dst,
851 const AVCodecContext *src);
853 void ff_h264_flush_change(H264Context *h);
855 void ff_h264_free_tables(H264Context *h);
857 void ff_h264_set_erpic(ERPicture *dst, H264Picture *src);
859 #endif /* AVCODEC_H264DEC_H */