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 Libav.
7 * Libav 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 * Libav 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 Libav; 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 32
54 #define MAX_MMCO_COUNT 66
56 #define MAX_DELAYED_PIC_COUNT 16
58 /* Compiling in interlaced support reduces the speed
59 * of progressive decoding by about 2%. */
60 #define ALLOW_INTERLACE
65 * The maximum number of slices supported by the decoder.
66 * must be a power of 2
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)
82 #define FRAME_MBAFF(h) 0
83 #define FIELD_PICTURE(h) 0
85 #define IS_INTERLACED(mb_type) 0
91 #define FIELD_OR_MBAFF_PICTURE(h) (FRAME_MBAFF(h) || FIELD_PICTURE(h))
94 #define CABAC(h) h->ps.pps->cabac
97 #define CHROMA422(h) (h->ps.sps->chroma_format_idc == 2)
98 #define CHROMA444(h) (h->ps.sps->chroma_format_idc == 3)
100 #define MB_TYPE_REF0 MB_TYPE_ACPRED // dirty but it fits in 16 bit
101 #define MB_TYPE_8x8DCT 0x01000000
102 #define IS_REF0(a) ((a) & MB_TYPE_REF0)
103 #define IS_8x8DCT(a) ((a) & MB_TYPE_8x8DCT)
106 * Memory management control operation opcode.
108 typedef enum MMCOOpcode {
119 * Memory management control operation.
121 typedef struct MMCO {
123 int short_pic_num; ///< pic_num without wrapping (pic_num & max_pic_num)
124 int long_arg; ///< index, pic_num, or num long refs depending on opcode
127 typedef struct H264Picture {
131 AVBufferRef *qscale_table_buf;
132 int8_t *qscale_table;
134 AVBufferRef *motion_val_buf[2];
135 int16_t (*motion_val[2])[2];
137 AVBufferRef *mb_type_buf;
140 AVBufferRef *hwaccel_priv_buf;
141 void *hwaccel_picture_private; ///< hardware accelerator private data
143 AVBufferRef *ref_index_buf[2];
144 int8_t *ref_index[2];
146 int field_poc[2]; ///< top/bottom POC
147 int poc; ///< frame POC
148 int frame_num; ///< frame_num (raw frame_num from slice header)
149 int mmco_reset; /**< MMCO_RESET set this 1. Reordering code must
150 not mix pictures before and after MMCO_RESET. */
151 int pic_id; /**< pic_num (short -> no wrap version of pic_num,
152 pic_num & max_pic_num; long -> long_pic_num) */
153 int long_ref; ///< 1->long term reference 0->short term reference
154 int ref_poc[2][2][32]; ///< POCs of the frames used as reference (FIXME need per slice)
155 int ref_count[2][2]; ///< number of entries in ref_poc (FIXME need per slice)
156 int mbaff; ///< 1 -> MBAFF frame 0-> not MBAFF
157 int field_picture; ///< whether or not picture was encoded in separate fields
160 int recovered; ///< picture at IDR or recovery point + recovery count
163 typedef struct H264Ref {
174 typedef struct H264SliceContext {
175 struct H264Context *h264;
181 int slice_type_nos; ///< S free slice type (SI/SP are remapped to I/P)
182 int slice_type_fixed;
185 int chroma_qp[2]; // QPc
186 int qp_thresh; ///< QP threshold to skip loopfilter
187 int last_qscale_diff;
190 int deblocking_filter; ///< disable_deblocking_filter_idc with 1 <-> 0
191 int slice_alpha_c0_offset;
192 int slice_beta_offset;
194 H264PredWeightTable pwt;
199 int chroma_pred_mode;
200 int intra16x16_pred_mode;
202 int8_t intra4x4_pred_mode_cache[5 * 8];
203 int8_t(*intra4x4_pred_mode);
208 int left_mb_xy[LEFT_MBS];
213 int left_type[LEFT_MBS];
215 const uint8_t *left_block;
216 int topleft_partition;
218 unsigned int topleft_samples_available;
219 unsigned int top_samples_available;
220 unsigned int topright_samples_available;
221 unsigned int left_samples_available;
223 ptrdiff_t linesize, uvlinesize;
224 ptrdiff_t mb_linesize; ///< may be equal to s->linesize or s->linesize * 2, for mbaff
225 ptrdiff_t mb_uvlinesize;
231 unsigned int first_mb_addr;
232 // index of the first MB of the next slice
237 int picture_structure;
238 int mb_field_decoding_flag;
239 int mb_mbaff; ///< mb_aff_frame && mb_field_decoding_flag
241 int redundant_pic_count;
244 * number of neighbors (top and/or left) that used 8x8 dct
246 int neighbor_transform_size;
248 int direct_spatial_mv_pred;
256 int dist_scale_factor[32];
257 int dist_scale_factor_field[2][32];
258 int map_col_to_list0[2][16 + 32];
259 int map_col_to_list0_field[2][2][16 + 32];
262 * num_ref_idx_l0/1_active_minus1 + 1
264 unsigned int ref_count[2]; ///< counts frames or fields, depending on current mb mode
265 unsigned int list_count;
266 H264Ref ref_list[2][48]; /**< 0..15: frame refs, 16..47: mbaff field refs.
267 * Reordered version of default_ref_list
268 * according to picture reordering in slice header */
272 } ref_modifications[2][32];
273 int nb_ref_modifications[2];
277 const uint8_t *intra_pcm_ptr;
278 int16_t *dc_val_base;
280 uint8_t *bipred_scratchpad;
281 uint8_t *edge_emu_buffer;
282 uint8_t (*top_borders[2])[(16 * 3) * 2];
283 int bipred_scratchpad_allocated;
284 int edge_emu_buffer_allocated;
285 int top_borders_allocated[2];
288 * non zero coeff count cache.
289 * is 64 if not available.
291 DECLARE_ALIGNED(8, uint8_t, non_zero_count_cache)[15 * 8];
294 * Motion vector cache.
296 DECLARE_ALIGNED(16, int16_t, mv_cache)[2][5 * 8][2];
297 DECLARE_ALIGNED(8, int8_t, ref_cache)[2][5 * 8];
298 DECLARE_ALIGNED(16, uint8_t, mvd_cache)[2][5 * 8][2];
299 uint8_t direct_cache[5 * 8];
301 DECLARE_ALIGNED(8, uint16_t, sub_mb_type)[4];
303 ///< as a DCT coefficient is int32_t in high depth, we need to reserve twice the space.
304 DECLARE_ALIGNED(16, int16_t, mb)[16 * 48 * 2];
305 DECLARE_ALIGNED(16, int16_t, mb_luma_dc)[3][16 * 2];
306 ///< as mb is addressed by scantable[i] and scantable is uint8_t we can either
307 ///< check that i is not too large or ensure that there is some unused stuff after mb
308 int16_t mb_padding[256 * 2];
310 uint8_t (*mvd_table[2])[2];
316 uint8_t cabac_state[1024];
319 MMCO mmco[MAX_MMCO_COUNT];
321 int explicit_ref_marking;
325 int delta_poc_bottom;
334 typedef struct H264Context {
335 const AVClass *class;
336 AVCodecContext *avctx;
337 VideoDSPContext vdsp;
338 H264DSPContext h264dsp;
339 H264ChromaContext h264chroma;
340 H264QpelContext h264qpel;
342 H264Picture DPB[H264_MAX_PICTURE_COUNT];
343 H264Picture *cur_pic_ptr;
346 H264SliceContext *slice_ctx;
348 int nb_slice_ctx_queued;
352 int pixel_shift; ///< 0 for 8-bit H.264, 1 for high-bit-depth H.264
354 /* coded dimensions -- 16 * mb w/h */
356 int chroma_x_shift, chroma_y_shift;
359 int coded_picture_number;
361 int context_initialized;
364 /* Set when slice threading is used and at least one slice uses deblocking
365 * mode 1 (i.e. across slice boundaries). Then we disable the loop filter
366 * during normal MB decoding and execute it serially at the end.
371 * Set to 1 when the current picture is IDR, 0 otherwise.
375 int8_t(*intra4x4_pred_mode);
378 uint8_t (*non_zero_count)[48];
380 #define LIST_NOT_USED -1 // FIXME rename?
381 #define PART_NOT_AVAILABLE -2
384 * block_offset[ 0..23] for frame macroblocks
385 * block_offset[24..47] for field macroblocks
387 int block_offset[2 * (16 * 3)];
389 uint32_t *mb2b_xy; // FIXME are these 4 a good idea?
391 int b_stride; // FIXME use s->b4_stride
393 uint16_t *slice_table; ///< slice_table_base + 2*mb_stride + 1
395 // interlacing specific flags
397 int picture_structure;
400 uint8_t *list_counts; ///< Array of list_count per MB specifying the slice type
402 /* 0x100 -> non null luma_dc, 0x80/0x40 -> non null chroma_dc (cb/cr), 0x?0 -> chroma_cbp(0, 1, 2), 0x0? luma_cbp */
405 /* chroma_pred_mode for i4x4 or i16x16, else 0 */
406 uint8_t *chroma_pred_mode_table;
407 uint8_t (*mvd_table[2])[2];
408 uint8_t *direct_table;
410 uint8_t zigzag_scan[16];
411 uint8_t zigzag_scan8x8[64];
412 uint8_t zigzag_scan8x8_cavlc[64];
413 uint8_t field_scan[16];
414 uint8_t field_scan8x8[64];
415 uint8_t field_scan8x8_cavlc[64];
416 const uint8_t *zigzag_scan_q0;
417 const uint8_t *zigzag_scan8x8_q0;
418 const uint8_t *zigzag_scan8x8_cavlc_q0;
419 const uint8_t *field_scan_q0;
420 const uint8_t *field_scan8x8_q0;
421 const uint8_t *field_scan8x8_cavlc_q0;
424 int mb_height, mb_width;
428 // =============================================================
429 // Things below are not used in the MB or more inner code
435 * Used to parse AVC variant of H.264
437 int is_avc; ///< this flag is != 0 if codec is avc1
438 int nal_length_size; ///< Number of bytes used for nal length (1, 2 or 4)
440 int bit_depth_luma; ///< luma bit depth from sps to detect changes
441 int chroma_format_idc; ///< chroma format from sps to detect changes
445 uint16_t *slice_table_base;
449 H264Picture *short_ref[32];
450 H264Picture *long_ref[32];
451 H264Picture *delayed_pic[MAX_DELAYED_PIC_COUNT + 2]; // FIXME size?
452 int last_pocs[MAX_DELAYED_PIC_COUNT];
453 int next_outputed_poc;
456 * memory management control operations buffer.
458 MMCO mmco[MAX_MMCO_COUNT];
461 int explicit_ref_marking;
463 int long_ref_count; ///< number of actual long term references
464 int short_ref_count; ///< number of actual short term references
467 * @name Members for slice based multithreading
471 * current slice number, used to initialize slice_num of each thread/context
478 * Complement sei_pic_struct
479 * SEI_PIC_STRUCT_TOP_BOTTOM and SEI_PIC_STRUCT_BOTTOM_TOP indicate interlaced frames.
480 * However, soft telecined frames may have these values.
481 * This is used in an attempt to flag soft telecine progressive.
483 int prev_interlaced_frame;
486 * recovery_frame is the frame_num at which the next frame should
487 * be fully constructed.
489 * Set to -1 when not expecting a recovery point.
494 * We have seen an IDR, so all the following frames in coded order are correctly
497 #define FRAME_RECOVERED_IDR (1 << 0)
499 * Sufficient number of frames have been decoded since a SEI recovery point,
500 * so all the following frames in presentation order are correct.
502 #define FRAME_RECOVERED_SEI (1 << 1)
504 int frame_recovered; ///< Initial frame has been completely recovered
506 /* for frame threading, this is set to 1
507 * after finish_setup() has been called, so we cannot modify
508 * some context properties (which are supposed to stay constant between
512 /* This is set to 1 if h264_field_start() has been called successfully,
513 * so all per-field state is properly initialized and we can decode
517 AVFrame *output_frame;
523 AVBufferPool *qscale_table_pool;
524 AVBufferPool *mb_type_pool;
525 AVBufferPool *motion_val_pool;
526 AVBufferPool *ref_index_pool;
527 int ref2frm[MAX_SLICES][2][64]; ///< reference to frame number lists, used in the loop filter, the first 2 are for -2,-1
530 extern const uint16_t ff_h264_mb_sizes[4];
533 * Reconstruct bitstream slice_type.
535 int ff_h264_get_slice_type(const H264SliceContext *sl);
541 int ff_h264_alloc_tables(H264Context *h);
543 int ff_h264_decode_ref_pic_list_reordering(H264SliceContext *sl, void *logctx);
544 int ff_h264_build_ref_list(const H264Context *h, H264SliceContext *sl);
545 void ff_h264_remove_all_refs(H264Context *h);
548 * Execute the reference picture marking (memory management control operations).
550 int ff_h264_execute_ref_pic_marking(H264Context *h);
552 int ff_h264_decode_ref_pic_marking(H264SliceContext *sl, GetBitContext *gb,
553 const H2645NAL *nal, void *logctx);
555 void ff_h264_hl_decode_mb(const H264Context *h, H264SliceContext *sl);
556 int ff_h264_decode_init(AVCodecContext *avctx);
557 void ff_h264_decode_init_vlc(void);
560 * Decode a macroblock
561 * @return 0 if OK, ER_AC_ERROR / ER_DC_ERROR / ER_MV_ERROR on error
563 int ff_h264_decode_mb_cavlc(const H264Context *h, H264SliceContext *sl);
566 * Decode a CABAC coded macroblock
567 * @return 0 if OK, ER_AC_ERROR / ER_DC_ERROR / ER_MV_ERROR on error
569 int ff_h264_decode_mb_cabac(const H264Context *h, H264SliceContext *sl);
571 void ff_h264_init_cabac_states(const H264Context *h, H264SliceContext *sl);
573 void ff_h264_init_dequant_tables(H264Context *h);
575 void ff_h264_direct_dist_scale_factor(const H264Context *const h, H264SliceContext *sl);
576 void ff_h264_direct_ref_list_init(const H264Context *const h, H264SliceContext *sl);
577 void ff_h264_pred_direct_motion(const H264Context *const h, H264SliceContext *sl,
580 void ff_h264_filter_mb_fast(const H264Context *h, H264SliceContext *sl, int mb_x, int mb_y,
581 uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr,
582 unsigned int linesize, unsigned int uvlinesize);
583 void ff_h264_filter_mb(const H264Context *h, H264SliceContext *sl, int mb_x, int mb_y,
584 uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr,
585 unsigned int linesize, unsigned int uvlinesize);
597 /* Scan8 organization:
614 * DY/DU/DV are for luma/chroma DC.
617 #define LUMA_DC_BLOCK_INDEX 48
618 #define CHROMA_DC_BLOCK_INDEX 49
620 // This table must be here because scan8[constant] must be known at compiletime
621 static const uint8_t scan8[16 * 3 + 3] = {
622 4 + 1 * 8, 5 + 1 * 8, 4 + 2 * 8, 5 + 2 * 8,
623 6 + 1 * 8, 7 + 1 * 8, 6 + 2 * 8, 7 + 2 * 8,
624 4 + 3 * 8, 5 + 3 * 8, 4 + 4 * 8, 5 + 4 * 8,
625 6 + 3 * 8, 7 + 3 * 8, 6 + 4 * 8, 7 + 4 * 8,
626 4 + 6 * 8, 5 + 6 * 8, 4 + 7 * 8, 5 + 7 * 8,
627 6 + 6 * 8, 7 + 6 * 8, 6 + 7 * 8, 7 + 7 * 8,
628 4 + 8 * 8, 5 + 8 * 8, 4 + 9 * 8, 5 + 9 * 8,
629 6 + 8 * 8, 7 + 8 * 8, 6 + 9 * 8, 7 + 9 * 8,
630 4 + 11 * 8, 5 + 11 * 8, 4 + 12 * 8, 5 + 12 * 8,
631 6 + 11 * 8, 7 + 11 * 8, 6 + 12 * 8, 7 + 12 * 8,
632 4 + 13 * 8, 5 + 13 * 8, 4 + 14 * 8, 5 + 14 * 8,
633 6 + 13 * 8, 7 + 13 * 8, 6 + 14 * 8, 7 + 14 * 8,
634 0 + 0 * 8, 0 + 5 * 8, 0 + 10 * 8
637 static av_always_inline uint32_t pack16to32(int a, int b)
640 return (b & 0xFFFF) + (a << 16);
642 return (a & 0xFFFF) + (b << 16);
646 static av_always_inline uint16_t pack8to16(int a, int b)
649 return (b & 0xFF) + (a << 8);
651 return (a & 0xFF) + (b << 8);
658 static av_always_inline int get_chroma_qp(const PPS *pps, int t, int qscale)
660 return pps->chroma_qp_table[t][qscale];
664 * Get the predicted intra4x4 prediction mode.
666 static av_always_inline int pred_intra_mode(const H264Context *h,
667 H264SliceContext *sl, int n)
669 const int index8 = scan8[n];
670 const int left = sl->intra4x4_pred_mode_cache[index8 - 1];
671 const int top = sl->intra4x4_pred_mode_cache[index8 - 8];
672 const int min = FFMIN(left, top);
674 ff_tlog(h->avctx, "mode:%d %d min:%d\n", left, top, min);
682 static av_always_inline void write_back_intra_pred_mode(const H264Context *h,
683 H264SliceContext *sl)
685 int8_t *i4x4 = sl->intra4x4_pred_mode + h->mb2br_xy[sl->mb_xy];
686 int8_t *i4x4_cache = sl->intra4x4_pred_mode_cache;
688 AV_COPY32(i4x4, i4x4_cache + 4 + 8 * 4);
689 i4x4[4] = i4x4_cache[7 + 8 * 3];
690 i4x4[5] = i4x4_cache[7 + 8 * 2];
691 i4x4[6] = i4x4_cache[7 + 8 * 1];
694 static av_always_inline void write_back_non_zero_count(const H264Context *h,
695 H264SliceContext *sl)
697 const int mb_xy = sl->mb_xy;
698 uint8_t *nnz = h->non_zero_count[mb_xy];
699 uint8_t *nnz_cache = sl->non_zero_count_cache;
701 AV_COPY32(&nnz[ 0], &nnz_cache[4 + 8 * 1]);
702 AV_COPY32(&nnz[ 4], &nnz_cache[4 + 8 * 2]);
703 AV_COPY32(&nnz[ 8], &nnz_cache[4 + 8 * 3]);
704 AV_COPY32(&nnz[12], &nnz_cache[4 + 8 * 4]);
705 AV_COPY32(&nnz[16], &nnz_cache[4 + 8 * 6]);
706 AV_COPY32(&nnz[20], &nnz_cache[4 + 8 * 7]);
707 AV_COPY32(&nnz[32], &nnz_cache[4 + 8 * 11]);
708 AV_COPY32(&nnz[36], &nnz_cache[4 + 8 * 12]);
710 if (!h->chroma_y_shift) {
711 AV_COPY32(&nnz[24], &nnz_cache[4 + 8 * 8]);
712 AV_COPY32(&nnz[28], &nnz_cache[4 + 8 * 9]);
713 AV_COPY32(&nnz[40], &nnz_cache[4 + 8 * 13]);
714 AV_COPY32(&nnz[44], &nnz_cache[4 + 8 * 14]);
718 static av_always_inline void write_back_motion_list(const H264Context *h,
719 H264SliceContext *sl,
722 int mb_type, int list)
724 int16_t(*mv_dst)[2] = &h->cur_pic.motion_val[list][b_xy];
725 int16_t(*mv_src)[2] = &sl->mv_cache[list][scan8[0]];
726 AV_COPY128(mv_dst + 0 * b_stride, mv_src + 8 * 0);
727 AV_COPY128(mv_dst + 1 * b_stride, mv_src + 8 * 1);
728 AV_COPY128(mv_dst + 2 * b_stride, mv_src + 8 * 2);
729 AV_COPY128(mv_dst + 3 * b_stride, mv_src + 8 * 3);
731 uint8_t (*mvd_dst)[2] = &sl->mvd_table[list][FMO ? 8 * sl->mb_xy
732 : h->mb2br_xy[sl->mb_xy]];
733 uint8_t(*mvd_src)[2] = &sl->mvd_cache[list][scan8[0]];
734 if (IS_SKIP(mb_type)) {
737 AV_COPY64(mvd_dst, mvd_src + 8 * 3);
738 AV_COPY16(mvd_dst + 3 + 3, mvd_src + 3 + 8 * 0);
739 AV_COPY16(mvd_dst + 3 + 2, mvd_src + 3 + 8 * 1);
740 AV_COPY16(mvd_dst + 3 + 1, mvd_src + 3 + 8 * 2);
745 int8_t *ref_index = &h->cur_pic.ref_index[list][b8_xy];
746 int8_t *ref_cache = sl->ref_cache[list];
747 ref_index[0 + 0 * 2] = ref_cache[scan8[0]];
748 ref_index[1 + 0 * 2] = ref_cache[scan8[4]];
749 ref_index[0 + 1 * 2] = ref_cache[scan8[8]];
750 ref_index[1 + 1 * 2] = ref_cache[scan8[12]];
754 static av_always_inline void write_back_motion(const H264Context *h,
755 H264SliceContext *sl,
758 const int b_stride = h->b_stride;
759 const int b_xy = 4 * sl->mb_x + 4 * sl->mb_y * h->b_stride; // try mb2b(8)_xy
760 const int b8_xy = 4 * sl->mb_xy;
762 if (USES_LIST(mb_type, 0)) {
763 write_back_motion_list(h, sl, b_stride, b_xy, b8_xy, mb_type, 0);
765 fill_rectangle(&h->cur_pic.ref_index[0][b8_xy],
766 2, 2, 2, (uint8_t)LIST_NOT_USED, 1);
768 if (USES_LIST(mb_type, 1))
769 write_back_motion_list(h, sl, b_stride, b_xy, b8_xy, mb_type, 1);
771 if (sl->slice_type_nos == AV_PICTURE_TYPE_B && CABAC(h)) {
772 if (IS_8X8(mb_type)) {
773 uint8_t *direct_table = &h->direct_table[4 * sl->mb_xy];
774 direct_table[1] = sl->sub_mb_type[1] >> 1;
775 direct_table[2] = sl->sub_mb_type[2] >> 1;
776 direct_table[3] = sl->sub_mb_type[3] >> 1;
781 static av_always_inline int get_dct8x8_allowed(const H264Context *h, H264SliceContext *sl)
783 if (h->ps.sps->direct_8x8_inference_flag)
784 return !(AV_RN64A(sl->sub_mb_type) &
785 ((MB_TYPE_16x8 | MB_TYPE_8x16 | MB_TYPE_8x8) *
786 0x0001000100010001ULL));
788 return !(AV_RN64A(sl->sub_mb_type) &
789 ((MB_TYPE_16x8 | MB_TYPE_8x16 | MB_TYPE_8x8 | MB_TYPE_DIRECT2) *
790 0x0001000100010001ULL));
793 int ff_h264_field_end(H264Context *h, H264SliceContext *sl, int in_setup);
795 int ff_h264_ref_picture(H264Context *h, H264Picture *dst, H264Picture *src);
796 void ff_h264_unref_picture(H264Context *h, H264Picture *pic);
798 int ff_h264_slice_context_init(H264Context *h, H264SliceContext *sl);
800 void ff_h264_draw_horiz_band(const H264Context *h, H264SliceContext *sl, int y, int height);
803 * Submit a slice for decoding.
805 * Parse the slice header, starting a new field/frame if necessary. If any
806 * slices are queued for the previous field, they are decoded.
808 int ff_h264_queue_decode_slice(H264Context *h, const H2645NAL *nal);
809 int ff_h264_execute_decode_slices(H264Context *h);
810 int ff_h264_update_thread_context(AVCodecContext *dst,
811 const AVCodecContext *src);
813 void ff_h264_flush_change(H264Context *h);
815 void ff_h264_free_tables(H264Context *h);
817 #endif /* AVCODEC_H264DEC_H */